jtBaseApp/node_modules/@vue/compiler-dom/dist/compiler-dom.esm-browser.js

/**
 * Make a map and return a function for checking if a key
 * is in that map.
 * IMPORTANT: all calls of this function must be prefixed with
 * \/\*#\_\_PURE\_\_\*\/
 * So that rollup can tree-shake them if necessary.
 */
function makeMap(str, expectsLowerCase) {
    const map = Object.create(null);
    const list = str.split(',');
    for (let i = 0; i < list.length; i++) {
        map[list[i]] = true;
    }
    return expectsLowerCase ? val => !!map[val.toLowerCase()] : val => !!map[val];
}

/**
 * dev only flag -> name mapping
 */
const PatchFlagNames = {
    [1 /* TEXT */]: `TEXT`,
    [2 /* CLASS */]: `CLASS`,
    [4 /* STYLE */]: `STYLE`,
    [8 /* PROPS */]: `PROPS`,
    [16 /* FULL_PROPS */]: `FULL_PROPS`,
    [32 /* HYDRATE_EVENTS */]: `HYDRATE_EVENTS`,
    [64 /* STABLE_FRAGMENT */]: `STABLE_FRAGMENT`,
    [128 /* KEYED_FRAGMENT */]: `KEYED_FRAGMENT`,
    [256 /* UNKEYED_FRAGMENT */]: `UNKEYED_FRAGMENT`,
    [512 /* NEED_PATCH */]: `NEED_PATCH`,
    [1024 /* DYNAMIC_SLOTS */]: `DYNAMIC_SLOTS`,
    [2048 /* DEV_ROOT_FRAGMENT */]: `DEV_ROOT_FRAGMENT`,
    [-1 /* HOISTED */]: `HOISTED`,
    [-2 /* BAIL */]: `BAIL`
};

/**
 * Dev only
 */
const slotFlagsText = {
    [1 /* STABLE */]: 'STABLE',
    [2 /* DYNAMIC */]: 'DYNAMIC',
    [3 /* FORWARDED */]: 'FORWARDED'
};

const range = 2;
function generateCodeFrame(source, start = 0, end = source.length) {
    // Split the content into individual lines but capture the newline sequence
    // that separated each line. This is important because the actual sequence is
    // needed to properly take into account the full line length for offset
    // comparison
    let lines = source.split(/(\r?\n)/);
    // Separate the lines and newline sequences into separate arrays for easier referencing
    const newlineSequences = lines.filter((_, idx) => idx % 2 === 1);
    lines = lines.filter((_, idx) => idx % 2 === 0);
    let count = 0;
    const res = [];
    for (let i = 0; i < lines.length; i++) {
        count +=
            lines[i].length +
                ((newlineSequences[i] && newlineSequences[i].length) || 0);
        if (count >= start) {
            for (let j = i - range; j <= i + range || end > count; j++) {
                if (j < 0 || j >= lines.length)
                    continue;
                const line = j + 1;
                res.push(`${line}${' '.repeat(Math.max(3 - String(line).length, 0))}|  ${lines[j]}`);
                const lineLength = lines[j].length;
                const newLineSeqLength = (newlineSequences[j] && newlineSequences[j].length) || 0;
                if (j === i) {
                    // push underline
                    const pad = start - (count - (lineLength + newLineSeqLength));
                    const length = Math.max(1, end > count ? lineLength - pad : end - start);
                    res.push(`   |  ` + ' '.repeat(pad) + '^'.repeat(length));
                }
                else if (j > i) {
                    if (end > count) {
                        const length = Math.max(Math.min(end - count, lineLength), 1);
                        res.push(`   |  ` + '^'.repeat(length));
                    }
                    count += lineLength + newLineSeqLength;
                }
            }
            break;
        }
    }
    return res.join('\n');
}

const listDelimiterRE = /;(?![^(]*\))/g;
const propertyDelimiterRE = /:(.+)/;
function parseStringStyle(cssText) {
    const ret = {};
    cssText.split(listDelimiterRE).forEach(item => {
        if (item) {
            const tmp = item.split(propertyDelimiterRE);
            tmp.length > 1 && (ret[tmp[0].trim()] = tmp[1].trim());
        }
    });
    return ret;
}

// These tag configs are shared between compiler-dom and runtime-dom, so they
// https://developer.mozilla.org/en-US/docs/Web/HTML/Element
const HTML_TAGS = 'html,body,base,head,link,meta,style,title,address,article,aside,footer,' +
    'header,h1,h2,h3,h4,h5,h6,nav,section,div,dd,dl,dt,figcaption,' +
    'figure,picture,hr,img,li,main,ol,p,pre,ul,a,b,abbr,bdi,bdo,br,cite,code,' +
    'data,dfn,em,i,kbd,mark,q,rp,rt,ruby,s,samp,small,span,strong,sub,sup,' +
    'time,u,var,wbr,area,audio,map,track,video,embed,object,param,source,' +
    'canvas,script,noscript,del,ins,caption,col,colgroup,table,thead,tbody,td,' +
    'th,tr,button,datalist,fieldset,form,input,label,legend,meter,optgroup,' +
    'option,output,progress,select,textarea,details,dialog,menu,' +
    'summary,template,blockquote,iframe,tfoot';
// https://developer.mozilla.org/en-US/docs/Web/SVG/Element
const SVG_TAGS = 'svg,animate,animateMotion,animateTransform,circle,clipPath,color-profile,' +
    'defs,desc,discard,ellipse,feBlend,feColorMatrix,feComponentTransfer,' +
    'feComposite,feConvolveMatrix,feDiffuseLighting,feDisplacementMap,' +
    'feDistanceLight,feDropShadow,feFlood,feFuncA,feFuncB,feFuncG,feFuncR,' +
    'feGaussianBlur,feImage,feMerge,feMergeNode,feMorphology,feOffset,' +
    'fePointLight,feSpecularLighting,feSpotLight,feTile,feTurbulence,filter,' +
    'foreignObject,g,hatch,hatchpath,image,line,linearGradient,marker,mask,' +
    'mesh,meshgradient,meshpatch,meshrow,metadata,mpath,path,pattern,' +
    'polygon,polyline,radialGradient,rect,set,solidcolor,stop,switch,symbol,' +
    'text,textPath,title,tspan,unknown,use,view';
const VOID_TAGS = 'area,base,br,col,embed,hr,img,input,link,meta,param,source,track,wbr';
const isHTMLTag = /*#__PURE__*/ makeMap(HTML_TAGS);
const isSVGTag = /*#__PURE__*/ makeMap(SVG_TAGS);
const isVoidTag = /*#__PURE__*/ makeMap(VOID_TAGS);

const EMPTY_OBJ = Object.freeze({})
    ;
Object.freeze([]) ;
const NOOP = () => { };
/**
 * Always return false.
 */
const NO = () => false;
const onRE = /^on[^a-z]/;
const isOn = (key) => onRE.test(key);
const extend = Object.assign;
const isArray = Array.isArray;
const isString = (val) => typeof val === 'string';
const isSymbol = (val) => typeof val === 'symbol';
const isObject = (val) => val !== null && typeof val === 'object';
const isReservedProp = /*#__PURE__*/ makeMap(
// the leading comma is intentional so empty string "" is also included
',key,ref,' +
    'onVnodeBeforeMount,onVnodeMounted,' +
    'onVnodeBeforeUpdate,onVnodeUpdated,' +
    'onVnodeBeforeUnmount,onVnodeUnmounted');
const cacheStringFunction = (fn) => {
    const cache = Object.create(null);
    return ((str) => {
        const hit = cache[str];
        return hit || (cache[str] = fn(str));
    });
};
const camelizeRE = /-(\w)/g;
/**
 * @private
 */
const camelize = cacheStringFunction((str) => {
    return str.replace(camelizeRE, (_, c) => (c ? c.toUpperCase() : ''));
});
const hyphenateRE = /\B([A-Z])/g;
/**
 * @private
 */
const hyphenate = cacheStringFunction((str) => str.replace(hyphenateRE, '-$1').toLowerCase());
/**
 * @private
 */
const capitalize = cacheStringFunction((str) => str.charAt(0).toUpperCase() + str.slice(1));
/**
 * @private
 */
const toHandlerKey = cacheStringFunction((str) => str ? `on${capitalize(str)}` : ``);

function defaultOnError(error) {
    throw error;
}
function defaultOnWarn(msg) {
    console.warn(`[Vue warn] ${msg.message}`);
}
function createCompilerError(code, loc, messages, additionalMessage) {
    const msg = (messages || errorMessages)[code] + (additionalMessage || ``)
        ;
    const error = new SyntaxError(String(msg));
    error.code = code;
    error.loc = loc;
    return error;
}
const errorMessages = {
    // parse errors
    [0 /* ABRUPT_CLOSING_OF_EMPTY_COMMENT */]: 'Illegal comment.',
    [1 /* CDATA_IN_HTML_CONTENT */]: 'CDATA section is allowed only in XML context.',
    [2 /* DUPLICATE_ATTRIBUTE */]: 'Duplicate attribute.',
    [3 /* END_TAG_WITH_ATTRIBUTES */]: 'End tag cannot have attributes.',
    [4 /* END_TAG_WITH_TRAILING_SOLIDUS */]: "Illegal '/' in tags.",
    [5 /* EOF_BEFORE_TAG_NAME */]: 'Unexpected EOF in tag.',
    [6 /* EOF_IN_CDATA */]: 'Unexpected EOF in CDATA section.',
    [7 /* EOF_IN_COMMENT */]: 'Unexpected EOF in comment.',
    [8 /* EOF_IN_SCRIPT_HTML_COMMENT_LIKE_TEXT */]: 'Unexpected EOF in script.',
    [9 /* EOF_IN_TAG */]: 'Unexpected EOF in tag.',
    [10 /* INCORRECTLY_CLOSED_COMMENT */]: 'Incorrectly closed comment.',
    [11 /* INCORRECTLY_OPENED_COMMENT */]: 'Incorrectly opened comment.',
    [12 /* INVALID_FIRST_CHARACTER_OF_TAG_NAME */]: "Illegal tag name. Use '&lt;' to print '<'.",
    [13 /* MISSING_ATTRIBUTE_VALUE */]: 'Attribute value was expected.',
    [14 /* MISSING_END_TAG_NAME */]: 'End tag name was expected.',
    [15 /* MISSING_WHITESPACE_BETWEEN_ATTRIBUTES */]: 'Whitespace was expected.',
    [16 /* NESTED_COMMENT */]: "Unexpected '<!--' in comment.",
    [17 /* UNEXPECTED_CHARACTER_IN_ATTRIBUTE_NAME */]: 'Attribute name cannot contain U+0022 ("), U+0027 (\'), and U+003C (<).',
    [18 /* UNEXPECTED_CHARACTER_IN_UNQUOTED_ATTRIBUTE_VALUE */]: 'Unquoted attribute value cannot contain U+0022 ("), U+0027 (\'), U+003C (<), U+003D (=), and U+0060 (`).',
    [19 /* UNEXPECTED_EQUALS_SIGN_BEFORE_ATTRIBUTE_NAME */]: "Attribute name cannot start with '='.",
    [21 /* UNEXPECTED_QUESTION_MARK_INSTEAD_OF_TAG_NAME */]: "'<?' is allowed only in XML context.",
    [20 /* UNEXPECTED_NULL_CHARACTER */]: `Unexpected null character.`,
    [22 /* UNEXPECTED_SOLIDUS_IN_TAG */]: "Illegal '/' in tags.",
    // Vue-specific parse errors
    [23 /* X_INVALID_END_TAG */]: 'Invalid end tag.',
    [24 /* X_MISSING_END_TAG */]: 'Element is missing end tag.',
    [25 /* X_MISSING_INTERPOLATION_END */]: 'Interpolation end sign was not found.',
    [27 /* X_MISSING_DYNAMIC_DIRECTIVE_ARGUMENT_END */]: 'End bracket for dynamic directive argument was not found. ' +
        'Note that dynamic directive argument cannot contain spaces.',
    [26 /* X_MISSING_DIRECTIVE_NAME */]: 'Legal directive name was expected.',
    // transform errors
    [28 /* X_V_IF_NO_EXPRESSION */]: `v-if/v-else-if is missing expression.`,
    [29 /* X_V_IF_SAME_KEY */]: `v-if/else branches must use unique keys.`,
    [30 /* X_V_ELSE_NO_ADJACENT_IF */]: `v-else/v-else-if has no adjacent v-if.`,
    [31 /* X_V_FOR_NO_EXPRESSION */]: `v-for is missing expression.`,
    [32 /* X_V_FOR_MALFORMED_EXPRESSION */]: `v-for has invalid expression.`,
    [33 /* X_V_FOR_TEMPLATE_KEY_PLACEMENT */]: `<template v-for> key should be placed on the <template> tag.`,
    [34 /* X_V_BIND_NO_EXPRESSION */]: `v-bind is missing expression.`,
    [35 /* X_V_ON_NO_EXPRESSION */]: `v-on is missing expression.`,
    [36 /* X_V_SLOT_UNEXPECTED_DIRECTIVE_ON_SLOT_OUTLET */]: `Unexpected custom directive on <slot> outlet.`,
    [37 /* X_V_SLOT_MIXED_SLOT_USAGE */]: `Mixed v-slot usage on both the component and nested <template>.` +
        `When there are multiple named slots, all slots should use <template> ` +
        `syntax to avoid scope ambiguity.`,
    [38 /* X_V_SLOT_DUPLICATE_SLOT_NAMES */]: `Duplicate slot names found. `,
    [39 /* X_V_SLOT_EXTRANEOUS_DEFAULT_SLOT_CHILDREN */]: `Extraneous children found when component already has explicitly named ` +
        `default slot. These children will be ignored.`,
    [40 /* X_V_SLOT_MISPLACED */]: `v-slot can only be used on components or <template> tags.`,
    [41 /* X_V_MODEL_NO_EXPRESSION */]: `v-model is missing expression.`,
    [42 /* X_V_MODEL_MALFORMED_EXPRESSION */]: `v-model value must be a valid JavaScript member expression.`,
    [43 /* X_V_MODEL_ON_SCOPE_VARIABLE */]: `v-model cannot be used on v-for or v-slot scope variables because they are not writable.`,
    [44 /* X_INVALID_EXPRESSION */]: `Error parsing JavaScript expression: `,
    [45 /* X_KEEP_ALIVE_INVALID_CHILDREN */]: `<KeepAlive> expects exactly one child component.`,
    // generic errors
    [46 /* X_PREFIX_ID_NOT_SUPPORTED */]: `"prefixIdentifiers" option is not supported in this build of compiler.`,
    [47 /* X_MODULE_MODE_NOT_SUPPORTED */]: `ES module mode is not supported in this build of compiler.`,
    [48 /* X_CACHE_HANDLER_NOT_SUPPORTED */]: `"cacheHandlers" option is only supported when the "prefixIdentifiers" option is enabled.`,
    [49 /* X_SCOPE_ID_NOT_SUPPORTED */]: `"scopeId" option is only supported in module mode.`,
    // just to fullfill types
    [50 /* __EXTEND_POINT__ */]: ``
};

const FRAGMENT = Symbol(`Fragment` );
const TELEPORT = Symbol(`Teleport` );
const SUSPENSE = Symbol(`Suspense` );
const KEEP_ALIVE = Symbol(`KeepAlive` );
const BASE_TRANSITION = Symbol(`BaseTransition` );
const OPEN_BLOCK = Symbol(`openBlock` );
const CREATE_BLOCK = Symbol(`createBlock` );
const CREATE_ELEMENT_BLOCK = Symbol(`createElementBlock` );
const CREATE_VNODE = Symbol(`createVNode` );
const CREATE_ELEMENT_VNODE = Symbol(`createElementVNode` );
const CREATE_COMMENT = Symbol(`createCommentVNode` );
const CREATE_TEXT = Symbol(`createTextVNode` );
const CREATE_STATIC = Symbol(`createStaticVNode` );
const RESOLVE_COMPONENT = Symbol(`resolveComponent` );
const RESOLVE_DYNAMIC_COMPONENT = Symbol(`resolveDynamicComponent` );
const RESOLVE_DIRECTIVE = Symbol(`resolveDirective` );
const RESOLVE_FILTER = Symbol(`resolveFilter` );
const WITH_DIRECTIVES = Symbol(`withDirectives` );
const RENDER_LIST = Symbol(`renderList` );
const RENDER_SLOT = Symbol(`renderSlot` );
const CREATE_SLOTS = Symbol(`createSlots` );
const TO_DISPLAY_STRING = Symbol(`toDisplayString` );
const MERGE_PROPS = Symbol(`mergeProps` );
const NORMALIZE_CLASS = Symbol(`normalizeClass` );
const NORMALIZE_STYLE = Symbol(`normalizeStyle` );
const NORMALIZE_PROPS = Symbol(`normalizeProps` );
const GUARD_REACTIVE_PROPS = Symbol(`guardReactiveProps` );
const TO_HANDLERS = Symbol(`toHandlers` );
const CAMELIZE = Symbol(`camelize` );
const CAPITALIZE = Symbol(`capitalize` );
const TO_HANDLER_KEY = Symbol(`toHandlerKey` );
const SET_BLOCK_TRACKING = Symbol(`setBlockTracking` );
const PUSH_SCOPE_ID = Symbol(`pushScopeId` );
const POP_SCOPE_ID = Symbol(`popScopeId` );
const WITH_CTX = Symbol(`withCtx` );
const UNREF = Symbol(`unref` );
const IS_REF = Symbol(`isRef` );
const WITH_MEMO = Symbol(`withMemo` );
const IS_MEMO_SAME = Symbol(`isMemoSame` );
// Name mapping for runtime helpers that need to be imported from 'vue' in
// generated code. Make sure these are correctly exported in the runtime!
// Using `any` here because TS doesn't allow symbols as index type.
const helperNameMap = {
    [FRAGMENT]: `Fragment`,
    [TELEPORT]: `Teleport`,
    [SUSPENSE]: `Suspense`,
    [KEEP_ALIVE]: `KeepAlive`,
    [BASE_TRANSITION]: `BaseTransition`,
    [OPEN_BLOCK]: `openBlock`,
    [CREATE_BLOCK]: `createBlock`,
    [CREATE_ELEMENT_BLOCK]: `createElementBlock`,
    [CREATE_VNODE]: `createVNode`,
    [CREATE_ELEMENT_VNODE]: `createElementVNode`,
    [CREATE_COMMENT]: `createCommentVNode`,
    [CREATE_TEXT]: `createTextVNode`,
    [CREATE_STATIC]: `createStaticVNode`,
    [RESOLVE_COMPONENT]: `resolveComponent`,
    [RESOLVE_DYNAMIC_COMPONENT]: `resolveDynamicComponent`,
    [RESOLVE_DIRECTIVE]: `resolveDirective`,
    [RESOLVE_FILTER]: `resolveFilter`,
    [WITH_DIRECTIVES]: `withDirectives`,
    [RENDER_LIST]: `renderList`,
    [RENDER_SLOT]: `renderSlot`,
    [CREATE_SLOTS]: `createSlots`,
    [TO_DISPLAY_STRING]: `toDisplayString`,
    [MERGE_PROPS]: `mergeProps`,
    [NORMALIZE_CLASS]: `normalizeClass`,
    [NORMALIZE_STYLE]: `normalizeStyle`,
    [NORMALIZE_PROPS]: `normalizeProps`,
    [GUARD_REACTIVE_PROPS]: `guardReactiveProps`,
    [TO_HANDLERS]: `toHandlers`,
    [CAMELIZE]: `camelize`,
    [CAPITALIZE]: `capitalize`,
    [TO_HANDLER_KEY]: `toHandlerKey`,
    [SET_BLOCK_TRACKING]: `setBlockTracking`,
    [PUSH_SCOPE_ID]: `pushScopeId`,
    [POP_SCOPE_ID]: `popScopeId`,
    [WITH_CTX]: `withCtx`,
    [UNREF]: `unref`,
    [IS_REF]: `isRef`,
    [WITH_MEMO]: `withMemo`,
    [IS_MEMO_SAME]: `isMemoSame`
};
function registerRuntimeHelpers(helpers) {
    Object.getOwnPropertySymbols(helpers).forEach(s => {
        helperNameMap[s] = helpers[s];
    });
}

// AST Utilities ---------------------------------------------------------------
// Some expressions, e.g. sequence and conditional expressions, are never
// associated with template nodes, so their source locations are just a stub.
// Container types like CompoundExpression also don't need a real location.
const locStub = {
    source: '',
    start: { line: 1, column: 1, offset: 0 },
    end: { line: 1, column: 1, offset: 0 }
};
function createRoot(children, loc = locStub) {
    return {
        type: 0 /* ROOT */,
        children,
        helpers: [],
        components: [],
        directives: [],
        hoists: [],
        imports: [],
        cached: 0,
        temps: 0,
        codegenNode: undefined,
        loc
    };
}
function createVNodeCall(context, tag, props, children, patchFlag, dynamicProps, directives, isBlock = false, disableTracking = false, isComponent = false, loc = locStub) {
    if (context) {
        if (isBlock) {
            context.helper(OPEN_BLOCK);
            context.helper(getVNodeBlockHelper(context.inSSR, isComponent));
        }
        else {
            context.helper(getVNodeHelper(context.inSSR, isComponent));
        }
        if (directives) {
            context.helper(WITH_DIRECTIVES);
        }
    }
    return {
        type: 13 /* VNODE_CALL */,
        tag,
        props,
        children,
        patchFlag,
        dynamicProps,
        directives,
        isBlock,
        disableTracking,
        isComponent,
        loc
    };
}
function createArrayExpression(elements, loc = locStub) {
    return {
        type: 17 /* JS_ARRAY_EXPRESSION */,
        loc,
        elements
    };
}
function createObjectExpression(properties, loc = locStub) {
    return {
        type: 15 /* JS_OBJECT_EXPRESSION */,
        loc,
        properties
    };
}
function createObjectProperty(key, value) {
    return {
        type: 16 /* JS_PROPERTY */,
        loc: locStub,
        key: isString(key) ? createSimpleExpression(key, true) : key,
        value
    };
}
function createSimpleExpression(content, isStatic = false, loc = locStub, constType = 0 /* NOT_CONSTANT */) {
    return {
        type: 4 /* SIMPLE_EXPRESSION */,
        loc,
        content,
        isStatic,
        constType: isStatic ? 3 /* CAN_STRINGIFY */ : constType
    };
}
function createInterpolation(content, loc) {
    return {
        type: 5 /* INTERPOLATION */,
        loc,
        content: isString(content)
            ? createSimpleExpression(content, false, loc)
            : content
    };
}
function createCompoundExpression(children, loc = locStub) {
    return {
        type: 8 /* COMPOUND_EXPRESSION */,
        loc,
        children
    };
}
function createCallExpression(callee, args = [], loc = locStub) {
    return {
        type: 14 /* JS_CALL_EXPRESSION */,
        loc,
        callee,
        arguments: args
    };
}
function createFunctionExpression(params, returns = undefined, newline = false, isSlot = false, loc = locStub) {
    return {
        type: 18 /* JS_FUNCTION_EXPRESSION */,
        params,
        returns,
        newline,
        isSlot,
        loc
    };
}
function createConditionalExpression(test, consequent, alternate, newline = true) {
    return {
        type: 19 /* JS_CONDITIONAL_EXPRESSION */,
        test,
        consequent,
        alternate,
        newline,
        loc: locStub
    };
}
function createCacheExpression(index, value, isVNode = false) {
    return {
        type: 20 /* JS_CACHE_EXPRESSION */,
        index,
        value,
        isVNode,
        loc: locStub
    };
}
function createBlockStatement(body) {
    return {
        type: 21 /* JS_BLOCK_STATEMENT */,
        body,
        loc: locStub
    };
}
function createTemplateLiteral(elements) {
    return {
        type: 22 /* JS_TEMPLATE_LITERAL */,
        elements,
        loc: locStub
    };
}
function createIfStatement(test, consequent, alternate) {
    return {
        type: 23 /* JS_IF_STATEMENT */,
        test,
        consequent,
        alternate,
        loc: locStub
    };
}
function createAssignmentExpression(left, right) {
    return {
        type: 24 /* JS_ASSIGNMENT_EXPRESSION */,
        left,
        right,
        loc: locStub
    };
}
function createSequenceExpression(expressions) {
    return {
        type: 25 /* JS_SEQUENCE_EXPRESSION */,
        expressions,
        loc: locStub
    };
}
function createReturnStatement(returns) {
    return {
        type: 26 /* JS_RETURN_STATEMENT */,
        returns,
        loc: locStub
    };
}

const isStaticExp = (p) => p.type === 4 /* SIMPLE_EXPRESSION */ && p.isStatic;
const isBuiltInType = (tag, expected) => tag === expected || tag === hyphenate(expected);
function isCoreComponent(tag) {
    if (isBuiltInType(tag, 'Teleport')) {
        return TELEPORT;
    }
    else if (isBuiltInType(tag, 'Suspense')) {
        return SUSPENSE;
    }
    else if (isBuiltInType(tag, 'KeepAlive')) {
        return KEEP_ALIVE;
    }
    else if (isBuiltInType(tag, 'BaseTransition')) {
        return BASE_TRANSITION;
    }
}
const nonIdentifierRE = /^\d|[^\$\w]/;
const isSimpleIdentifier = (name) => !nonIdentifierRE.test(name);
const validFirstIdentCharRE = /[A-Za-z_$\xA0-\uFFFF]/;
const validIdentCharRE = /[\.\?\w$\xA0-\uFFFF]/;
const whitespaceRE = /\s+[.[]\s*|\s*[.[]\s+/g;
/**
 * Simple lexer to check if an expression is a member expression. This is
 * lax and only checks validity at the root level (i.e. does not validate exps
 * inside square brackets), but it's ok since these are only used on template
 * expressions and false positives are invalid expressions in the first place.
 */
const isMemberExpression = (path) => {
    // remove whitespaces around . or [ first
    path = path.trim().replace(whitespaceRE, s => s.trim());
    let state = 0 /* inMemberExp */;
    let stateStack = [];
    let currentOpenBracketCount = 0;
    let currentOpenParensCount = 0;
    let currentStringType = null;
    for (let i = 0; i < path.length; i++) {
        const char = path.charAt(i);
        switch (state) {
            case 0 /* inMemberExp */:
                if (char === '[') {
                    stateStack.push(state);
                    state = 1 /* inBrackets */;
                    currentOpenBracketCount++;
                }
                else if (char === '(') {
                    stateStack.push(state);
                    state = 2 /* inParens */;
                    currentOpenParensCount++;
                }
                else if (!(i === 0 ? validFirstIdentCharRE : validIdentCharRE).test(char)) {
                    return false;
                }
                break;
            case 1 /* inBrackets */:
                if (char === `'` || char === `"` || char === '`') {
                    stateStack.push(state);
                    state = 3 /* inString */;
                    currentStringType = char;
                }
                else if (char === `[`) {
                    currentOpenBracketCount++;
                }
                else if (char === `]`) {
                    if (!--currentOpenBracketCount) {
                        state = stateStack.pop();
                    }
                }
                break;
            case 2 /* inParens */:
                if (char === `'` || char === `"` || char === '`') {
                    stateStack.push(state);
                    state = 3 /* inString */;
                    currentStringType = char;
                }
                else if (char === `(`) {
                    currentOpenParensCount++;
                }
                else if (char === `)`) {
                    // if the exp ends as a call then it should not be considered valid
                    if (i === path.length - 1) {
                        return false;
                    }
                    if (!--currentOpenParensCount) {
                        state = stateStack.pop();
                    }
                }
                break;
            case 3 /* inString */:
                if (char === currentStringType) {
                    state = stateStack.pop();
                    currentStringType = null;
                }
                break;
        }
    }
    return !currentOpenBracketCount && !currentOpenParensCount;
};
function getInnerRange(loc, offset, length) {
    const source = loc.source.substr(offset, length);
    const newLoc = {
        source,
        start: advancePositionWithClone(loc.start, loc.source, offset),
        end: loc.end
    };
    if (length != null) {
        newLoc.end = advancePositionWithClone(loc.start, loc.source, offset + length);
    }
    return newLoc;
}
function advancePositionWithClone(pos, source, numberOfCharacters = source.length) {
    return advancePositionWithMutation(extend({}, pos), source, numberOfCharacters);
}
// advance by mutation without cloning (for performance reasons), since this
// gets called a lot in the parser
function advancePositionWithMutation(pos, source, numberOfCharacters = source.length) {
    let linesCount = 0;
    let lastNewLinePos = -1;
    for (let i = 0; i < numberOfCharacters; i++) {
        if (source.charCodeAt(i) === 10 /* newline char code */) {
            linesCount++;
            lastNewLinePos = i;
        }
    }
    pos.offset += numberOfCharacters;
    pos.line += linesCount;
    pos.column =
        lastNewLinePos === -1
            ? pos.column + numberOfCharacters
            : numberOfCharacters - lastNewLinePos;
    return pos;
}
function assert(condition, msg) {
    /* istanbul ignore if */
    if (!condition) {
        throw new Error(msg || `unexpected compiler condition`);
    }
}
function findDir(node, name, allowEmpty = false) {
    for (let i = 0; i < node.props.length; i++) {
        const p = node.props[i];
        if (p.type === 7 /* DIRECTIVE */ &&
            (allowEmpty || p.exp) &&
            (isString(name) ? p.name === name : name.test(p.name))) {
            return p;
        }
    }
}
function findProp(node, name, dynamicOnly = false, allowEmpty = false) {
    for (let i = 0; i < node.props.length; i++) {
        const p = node.props[i];
        if (p.type === 6 /* ATTRIBUTE */) {
            if (dynamicOnly)
                continue;
            if (p.name === name && (p.value || allowEmpty)) {
                return p;
            }
        }
        else if (p.name === 'bind' &&
            (p.exp || allowEmpty) &&
            isBindKey(p.arg, name)) {
            return p;
        }
    }
}
function isBindKey(arg, name) {
    return !!(arg && isStaticExp(arg) && arg.content === name);
}
function hasDynamicKeyVBind(node) {
    return node.props.some(p => p.type === 7 /* DIRECTIVE */ &&
        p.name === 'bind' &&
        (!p.arg || // v-bind="obj"
            p.arg.type !== 4 /* SIMPLE_EXPRESSION */ || // v-bind:[_ctx.foo]
            !p.arg.isStatic) // v-bind:[foo]
    );
}
function isText(node) {
    return node.type === 5 /* INTERPOLATION */ || node.type === 2 /* TEXT */;
}
function isVSlot(p) {
    return p.type === 7 /* DIRECTIVE */ && p.name === 'slot';
}
function isTemplateNode(node) {
    return (node.type === 1 /* ELEMENT */ && node.tagType === 3 /* TEMPLATE */);
}
function isSlotOutlet(node) {
    return node.type === 1 /* ELEMENT */ && node.tagType === 2 /* SLOT */;
}
function getVNodeHelper(ssr, isComponent) {
    return ssr || isComponent ? CREATE_VNODE : CREATE_ELEMENT_VNODE;
}
function getVNodeBlockHelper(ssr, isComponent) {
    return ssr || isComponent ? CREATE_BLOCK : CREATE_ELEMENT_BLOCK;
}
const propsHelperSet = new Set([NORMALIZE_PROPS, GUARD_REACTIVE_PROPS]);
function getUnnormalizedProps(props, callPath = []) {
    if (props &&
        !isString(props) &&
        props.type === 14 /* JS_CALL_EXPRESSION */) {
        const callee = props.callee;
        if (!isString(callee) && propsHelperSet.has(callee)) {
            return getUnnormalizedProps(props.arguments[0], callPath.concat(props));
        }
    }
    return [props, callPath];
}
function injectProp(node, prop, context) {
    let propsWithInjection;
    const originalProps = node.type === 13 /* VNODE_CALL */ ? node.props : node.arguments[2];
    /**
     * 1. mergeProps(...)
     * 2. toHandlers(...)
     * 3. normalizeProps(...)
     * 4. normalizeProps(guardReactiveProps(...))
     *
     * we need to get the real props before normalization
     */
    let props = originalProps;
    let callPath = [];
    let parentCall;
    if (props &&
        !isString(props) &&
        props.type === 14 /* JS_CALL_EXPRESSION */) {
        const ret = getUnnormalizedProps(props);
        props = ret[0];
        callPath = ret[1];
        parentCall = callPath[callPath.length - 1];
    }
    if (props == null || isString(props)) {
        propsWithInjection = createObjectExpression([prop]);
    }
    else if (props.type === 14 /* JS_CALL_EXPRESSION */) {
        // merged props... add ours
        // only inject key to object literal if it's the first argument so that
        // if doesn't override user provided keys
        const first = props.arguments[0];
        if (!isString(first) && first.type === 15 /* JS_OBJECT_EXPRESSION */) {
            first.properties.unshift(prop);
        }
        else {
            if (props.callee === TO_HANDLERS) {
                // #2366
                propsWithInjection = createCallExpression(context.helper(MERGE_PROPS), [
                    createObjectExpression([prop]),
                    props
                ]);
            }
            else {
                props.arguments.unshift(createObjectExpression([prop]));
            }
        }
        !propsWithInjection && (propsWithInjection = props);
    }
    else if (props.type === 15 /* JS_OBJECT_EXPRESSION */) {
        let alreadyExists = false;
        // check existing key to avoid overriding user provided keys
        if (prop.key.type === 4 /* SIMPLE_EXPRESSION */) {
            const propKeyName = prop.key.content;
            alreadyExists = props.properties.some(p => p.key.type === 4 /* SIMPLE_EXPRESSION */ &&
                p.key.content === propKeyName);
        }
        if (!alreadyExists) {
            props.properties.unshift(prop);
        }
        propsWithInjection = props;
    }
    else {
        // single v-bind with expression, return a merged replacement
        propsWithInjection = createCallExpression(context.helper(MERGE_PROPS), [
            createObjectExpression([prop]),
            props
        ]);
        // in the case of nested helper call, e.g. `normalizeProps(guardReactiveProps(props))`,
        // it will be rewritten as `normalizeProps(mergeProps({ key: 0 }, props))`,
        // the `guardReactiveProps` will no longer be needed
        if (parentCall && parentCall.callee === GUARD_REACTIVE_PROPS) {
            parentCall = callPath[callPath.length - 2];
        }
    }
    if (node.type === 13 /* VNODE_CALL */) {
        if (parentCall) {
            parentCall.arguments[0] = propsWithInjection;
        }
        else {
            node.props = propsWithInjection;
        }
    }
    else {
        if (parentCall) {
            parentCall.arguments[0] = propsWithInjection;
        }
        else {
            node.arguments[2] = propsWithInjection;
        }
    }
}
function toValidAssetId(name, type) {
    // see issue#4422, we need adding identifier on validAssetId if variable `name` has specific character
    return `_${type}_${name.replace(/[^\w]/g, (searchValue, replaceValue) => {
        return searchValue === '-' ? '_' : name.charCodeAt(replaceValue).toString();
    })}`;
}
// Check if a node contains expressions that reference current context scope ids
function hasScopeRef(node, ids) {
    if (!node || Object.keys(ids).length === 0) {
        return false;
    }
    switch (node.type) {
        case 1 /* ELEMENT */:
            for (let i = 0; i < node.props.length; i++) {
                const p = node.props[i];
                if (p.type === 7 /* DIRECTIVE */ &&
                    (hasScopeRef(p.arg, ids) || hasScopeRef(p.exp, ids))) {
                    return true;
                }
            }
            return node.children.some(c => hasScopeRef(c, ids));
        case 11 /* FOR */:
            if (hasScopeRef(node.source, ids)) {
                return true;
            }
            return node.children.some(c => hasScopeRef(c, ids));
        case 9 /* IF */:
            return node.branches.some(b => hasScopeRef(b, ids));
        case 10 /* IF_BRANCH */:
            if (hasScopeRef(node.condition, ids)) {
                return true;
            }
            return node.children.some(c => hasScopeRef(c, ids));
        case 4 /* SIMPLE_EXPRESSION */:
            return (!node.isStatic &&
                isSimpleIdentifier(node.content) &&
                !!ids[node.content]);
        case 8 /* COMPOUND_EXPRESSION */:
            return node.children.some(c => isObject(c) && hasScopeRef(c, ids));
        case 5 /* INTERPOLATION */:
        case 12 /* TEXT_CALL */:
            return hasScopeRef(node.content, ids);
        case 2 /* TEXT */:
        case 3 /* COMMENT */:
            return false;
        default:
            return false;
    }
}
function getMemoedVNodeCall(node) {
    if (node.type === 14 /* JS_CALL_EXPRESSION */ && node.callee === WITH_MEMO) {
        return node.arguments[1].returns;
    }
    else {
        return node;
    }
}
function makeBlock(node, { helper, removeHelper, inSSR }) {
    if (!node.isBlock) {
        node.isBlock = true;
        removeHelper(getVNodeHelper(inSSR, node.isComponent));
        helper(OPEN_BLOCK);
        helper(getVNodeBlockHelper(inSSR, node.isComponent));
    }
}

const deprecationData = {
    ["COMPILER_IS_ON_ELEMENT" /* COMPILER_IS_ON_ELEMENT */]: {
        message: `Platform-native elements with "is" prop will no longer be ` +
            `treated as components in Vue 3 unless the "is" value is explicitly ` +
            `prefixed with "vue:".`,
        link: `https://v3.vuejs.org/guide/migration/custom-elements-interop.html`
    },
    ["COMPILER_V_BIND_SYNC" /* COMPILER_V_BIND_SYNC */]: {
        message: key => `.sync modifier for v-bind has been removed. Use v-model with ` +
            `argument instead. \`v-bind:${key}.sync\` should be changed to ` +
            `\`v-model:${key}\`.`,
        link: `https://v3.vuejs.org/guide/migration/v-model.html`
    },
    ["COMPILER_V_BIND_PROP" /* COMPILER_V_BIND_PROP */]: {
        message: `.prop modifier for v-bind has been removed and no longer necessary. ` +
            `Vue 3 will automatically set a binding as DOM property when appropriate.`
    },
    ["COMPILER_V_BIND_OBJECT_ORDER" /* COMPILER_V_BIND_OBJECT_ORDER */]: {
        message: `v-bind="obj" usage is now order sensitive and behaves like JavaScript ` +
            `object spread: it will now overwrite an existing non-mergeable attribute ` +
            `that appears before v-bind in the case of conflict. ` +
            `To retain 2.x behavior, move v-bind to make it the first attribute. ` +
            `You can also suppress this warning if the usage is intended.`,
        link: `https://v3.vuejs.org/guide/migration/v-bind.html`
    },
    ["COMPILER_V_ON_NATIVE" /* COMPILER_V_ON_NATIVE */]: {
        message: `.native modifier for v-on has been removed as is no longer necessary.`,
        link: `https://v3.vuejs.org/guide/migration/v-on-native-modifier-removed.html`
    },
    ["COMPILER_V_IF_V_FOR_PRECEDENCE" /* COMPILER_V_IF_V_FOR_PRECEDENCE */]: {
        message: `v-if / v-for precedence when used on the same element has changed ` +
            `in Vue 3: v-if now takes higher precedence and will no longer have ` +
            `access to v-for scope variables. It is best to avoid the ambiguity ` +
            `with <template> tags or use a computed property that filters v-for ` +
            `data source.`,
        link: `https://v3.vuejs.org/guide/migration/v-if-v-for.html`
    },
    ["COMPILER_V_FOR_REF" /* COMPILER_V_FOR_REF */]: {
        message: `Ref usage on v-for no longer creates array ref values in Vue 3. ` +
            `Consider using function refs or refactor to avoid ref usage altogether.`,
        link: `https://v3.vuejs.org/guide/migration/array-refs.html`
    },
    ["COMPILER_NATIVE_TEMPLATE" /* COMPILER_NATIVE_TEMPLATE */]: {
        message: `<template> with no special directives will render as a native template ` +
            `element instead of its inner content in Vue 3.`
    },
    ["COMPILER_INLINE_TEMPLATE" /* COMPILER_INLINE_TEMPLATE */]: {
        message: `"inline-template" has been removed in Vue 3.`,
        link: `https://v3.vuejs.org/guide/migration/inline-template-attribute.html`
    },
    ["COMPILER_FILTER" /* COMPILER_FILTERS */]: {
        message: `filters have been removed in Vue 3. ` +
            `The "|" symbol will be treated as native JavaScript bitwise OR operator. ` +
            `Use method calls or computed properties instead.`,
        link: `https://v3.vuejs.org/guide/migration/filters.html`
    }
};
function getCompatValue(key, context) {
    const config = context.options
        ? context.options.compatConfig
        : context.compatConfig;
    const value = config && config[key];
    if (key === 'MODE') {
        return value || 3; // compiler defaults to v3 behavior
    }
    else {
        return value;
    }
}
function isCompatEnabled(key, context) {
    const mode = getCompatValue('MODE', context);
    const value = getCompatValue(key, context);
    // in v3 mode, only enable if explicitly set to true
    // otherwise enable for any non-false value
    return mode === 3 ? value === true : value !== false;
}
function checkCompatEnabled(key, context, loc, ...args) {
    const enabled = isCompatEnabled(key, context);
    if (enabled) {
        warnDeprecation(key, context, loc, ...args);
    }
    return enabled;
}
function warnDeprecation(key, context, loc, ...args) {
    const val = getCompatValue(key, context);
    if (val === 'suppress-warning') {
        return;
    }
    const { message, link } = deprecationData[key];
    const msg = `(deprecation ${key}) ${typeof message === 'function' ? message(...args) : message}${link ? `\n  Details: ${link}` : ``}`;
    const err = new SyntaxError(msg);
    err.code = key;
    if (loc)
        err.loc = loc;
    context.onWarn(err);
}

// The default decoder only provides escapes for characters reserved as part of
// the template syntax, and is only used if the custom renderer did not provide
// a platform-specific decoder.
const decodeRE = /&(gt|lt|amp|apos|quot);/g;
const decodeMap = {
    gt: '>',
    lt: '<',
    amp: '&',
    apos: "'",
    quot: '"'
};
const defaultParserOptions = {
    delimiters: [`{{`, `}}`],
    getNamespace: () => 0 /* HTML */,
    getTextMode: () => 0 /* DATA */,
    isVoidTag: NO,
    isPreTag: NO,
    isCustomElement: NO,
    decodeEntities: (rawText) => rawText.replace(decodeRE, (_, p1) => decodeMap[p1]),
    onError: defaultOnError,
    onWarn: defaultOnWarn,
    comments: true
};
function baseParse(content, options = {}) {
    const context = createParserContext(content, options);
    const start = getCursor(context);
    return createRoot(parseChildren(context, 0 /* DATA */, []), getSelection(context, start));
}
function createParserContext(content, rawOptions) {
    const options = extend({}, defaultParserOptions);
    let key;
    for (key in rawOptions) {
        // @ts-ignore
        options[key] =
            rawOptions[key] === undefined
                ? defaultParserOptions[key]
                : rawOptions[key];
    }
    return {
        options,
        column: 1,
        line: 1,
        offset: 0,
        originalSource: content,
        source: content,
        inPre: false,
        inVPre: false,
        onWarn: options.onWarn
    };
}
function parseChildren(context, mode, ancestors) {
    const parent = last(ancestors);
    const ns = parent ? parent.ns : 0 /* HTML */;
    const nodes = [];
    while (!isEnd(context, mode, ancestors)) {
        const s = context.source;
        let node = undefined;
        if (mode === 0 /* DATA */ || mode === 1 /* RCDATA */) {
            if (!context.inVPre && startsWith(s, context.options.delimiters[0])) {
                // '{{'
                node = parseInterpolation(context, mode);
            }
            else if (mode === 0 /* DATA */ && s[0] === '<') {
                // https://html.spec.whatwg.org/multipage/parsing.html#tag-open-state
                if (s.length === 1) {
                    emitError(context, 5 /* EOF_BEFORE_TAG_NAME */, 1);
                }
                else if (s[1] === '!') {
                    // https://html.spec.whatwg.org/multipage/parsing.html#markup-declaration-open-state
                    if (startsWith(s, '<!--')) {
                        node = parseComment(context);
                    }
                    else if (startsWith(s, '<!DOCTYPE')) {
                        // Ignore DOCTYPE by a limitation.
                        node = parseBogusComment(context);
                    }
                    else if (startsWith(s, '<![CDATA[')) {
                        if (ns !== 0 /* HTML */) {
                            node = parseCDATA(context, ancestors);
                        }
                        else {
                            emitError(context, 1 /* CDATA_IN_HTML_CONTENT */);
                            node = parseBogusComment(context);
                        }
                    }
                    else {
                        emitError(context, 11 /* INCORRECTLY_OPENED_COMMENT */);
                        node = parseBogusComment(context);
                    }
                }
                else if (s[1] === '/') {
                    // https://html.spec.whatwg.org/multipage/parsing.html#end-tag-open-state
                    if (s.length === 2) {
                        emitError(context, 5 /* EOF_BEFORE_TAG_NAME */, 2);
                    }
                    else if (s[2] === '>') {
                        emitError(context, 14 /* MISSING_END_TAG_NAME */, 2);
                        advanceBy(context, 3);
                        continue;
                    }
                    else if (/[a-z]/i.test(s[2])) {
                        emitError(context, 23 /* X_INVALID_END_TAG */);
                        parseTag(context, 1 /* End */, parent);
                        continue;
                    }
                    else {
                        emitError(context, 12 /* INVALID_FIRST_CHARACTER_OF_TAG_NAME */, 2);
                        node = parseBogusComment(context);
                    }
                }
                else if (/[a-z]/i.test(s[1])) {
                    node = parseElement(context, ancestors);
                    // 2.x <template> with no directive compat
                    if (isCompatEnabled("COMPILER_NATIVE_TEMPLATE" /* COMPILER_NATIVE_TEMPLATE */, context) &&
                        node &&
                        node.tag === 'template' &&
                        !node.props.some(p => p.type === 7 /* DIRECTIVE */ &&
                            isSpecialTemplateDirective(p.name))) {
                        warnDeprecation("COMPILER_NATIVE_TEMPLATE" /* COMPILER_NATIVE_TEMPLATE */, context, node.loc);
                        node = node.children;
                    }
                }
                else if (s[1] === '?') {
                    emitError(context, 21 /* UNEXPECTED_QUESTION_MARK_INSTEAD_OF_TAG_NAME */, 1);
                    node = parseBogusComment(context);
                }
                else {
                    emitError(context, 12 /* INVALID_FIRST_CHARACTER_OF_TAG_NAME */, 1);
                }
            }
        }
        if (!node) {
            node = parseText(context, mode);
        }
        if (isArray(node)) {
            for (let i = 0; i < node.length; i++) {
                pushNode(nodes, node[i]);
            }
        }
        else {
            pushNode(nodes, node);
        }
    }
    // Whitespace handling strategy like v2
    let removedWhitespace = false;
    if (mode !== 2 /* RAWTEXT */ && mode !== 1 /* RCDATA */) {
        const shouldCondense = context.options.whitespace !== 'preserve';
        for (let i = 0; i < nodes.length; i++) {
            const node = nodes[i];
            if (!context.inPre && node.type === 2 /* TEXT */) {
                if (!/[^\t\r\n\f ]/.test(node.content)) {
                    const prev = nodes[i - 1];
                    const next = nodes[i + 1];
                    // Remove if:
                    // - the whitespace is the first or last node, or:
                    // - (condense mode) the whitespace is adjacent to a comment, or:
                    // - (condense mode) the whitespace is between two elements AND contains newline
                    if (!prev ||
                        !next ||
                        (shouldCondense &&
                            (prev.type === 3 /* COMMENT */ ||
                                next.type === 3 /* COMMENT */ ||
                                (prev.type === 1 /* ELEMENT */ &&
                                    next.type === 1 /* ELEMENT */ &&
                                    /[\r\n]/.test(node.content))))) {
                        removedWhitespace = true;
                        nodes[i] = null;
                    }
                    else {
                        // Otherwise, the whitespace is condensed into a single space
                        node.content = ' ';
                    }
                }
                else if (shouldCondense) {
                    // in condense mode, consecutive whitespaces in text are condensed
                    // down to a single space.
                    node.content = node.content.replace(/[\t\r\n\f ]+/g, ' ');
                }
            }
            // Remove comment nodes if desired by configuration.
            else if (node.type === 3 /* COMMENT */ && !context.options.comments) {
                removedWhitespace = true;
                nodes[i] = null;
            }
        }
        if (context.inPre && parent && context.options.isPreTag(parent.tag)) {
            // remove leading newline per html spec
            // https://html.spec.whatwg.org/multipage/grouping-content.html#the-pre-element
            const first = nodes[0];
            if (first && first.type === 2 /* TEXT */) {
                first.content = first.content.replace(/^\r?\n/, '');
            }
        }
    }
    return removedWhitespace ? nodes.filter(Boolean) : nodes;
}
function pushNode(nodes, node) {
    if (node.type === 2 /* TEXT */) {
        const prev = last(nodes);
        // Merge if both this and the previous node are text and those are
        // consecutive. This happens for cases like "a < b".
        if (prev &&
            prev.type === 2 /* TEXT */ &&
            prev.loc.end.offset === node.loc.start.offset) {
            prev.content += node.content;
            prev.loc.end = node.loc.end;
            prev.loc.source += node.loc.source;
            return;
        }
    }
    nodes.push(node);
}
function parseCDATA(context, ancestors) {
    advanceBy(context, 9);
    const nodes = parseChildren(context, 3 /* CDATA */, ancestors);
    if (context.source.length === 0) {
        emitError(context, 6 /* EOF_IN_CDATA */);
    }
    else {
        advanceBy(context, 3);
    }
    return nodes;
}
function parseComment(context) {
    const start = getCursor(context);
    let content;
    // Regular comment.
    const match = /--(\!)?>/.exec(context.source);
    if (!match) {
        content = context.source.slice(4);
        advanceBy(context, context.source.length);
        emitError(context, 7 /* EOF_IN_COMMENT */);
    }
    else {
        if (match.index <= 3) {
            emitError(context, 0 /* ABRUPT_CLOSING_OF_EMPTY_COMMENT */);
        }
        if (match[1]) {
            emitError(context, 10 /* INCORRECTLY_CLOSED_COMMENT */);
        }
        content = context.source.slice(4, match.index);
        // Advancing with reporting nested comments.
        const s = context.source.slice(0, match.index);
        let prevIndex = 1, nestedIndex = 0;
        while ((nestedIndex = s.indexOf('<!--', prevIndex)) !== -1) {
            advanceBy(context, nestedIndex - prevIndex + 1);
            if (nestedIndex + 4 < s.length) {
                emitError(context, 16 /* NESTED_COMMENT */);
            }
            prevIndex = nestedIndex + 1;
        }
        advanceBy(context, match.index + match[0].length - prevIndex + 1);
    }
    return {
        type: 3 /* COMMENT */,
        content,
        loc: getSelection(context, start)
    };
}
function parseBogusComment(context) {
    const start = getCursor(context);
    const contentStart = context.source[1] === '?' ? 1 : 2;
    let content;
    const closeIndex = context.source.indexOf('>');
    if (closeIndex === -1) {
        content = context.source.slice(contentStart);
        advanceBy(context, context.source.length);
    }
    else {
        content = context.source.slice(contentStart, closeIndex);
        advanceBy(context, closeIndex + 1);
    }
    return {
        type: 3 /* COMMENT */,
        content,
        loc: getSelection(context, start)
    };
}
function parseElement(context, ancestors) {
    // Start tag.
    const wasInPre = context.inPre;
    const wasInVPre = context.inVPre;
    const parent = last(ancestors);
    const element = parseTag(context, 0 /* Start */, parent);
    const isPreBoundary = context.inPre && !wasInPre;
    const isVPreBoundary = context.inVPre && !wasInVPre;
    if (element.isSelfClosing || context.options.isVoidTag(element.tag)) {
        // #4030 self-closing <pre> tag
        if (isPreBoundary) {
            context.inPre = false;
        }
        if (isVPreBoundary) {
            context.inVPre = false;
        }
        return element;
    }
    // Children.
    ancestors.push(element);
    const mode = context.options.getTextMode(element, parent);
    const children = parseChildren(context, mode, ancestors);
    ancestors.pop();
    // 2.x inline-template compat
    {
        const inlineTemplateProp = element.props.find(p => p.type === 6 /* ATTRIBUTE */ && p.name === 'inline-template');
        if (inlineTemplateProp &&
            checkCompatEnabled("COMPILER_INLINE_TEMPLATE" /* COMPILER_INLINE_TEMPLATE */, context, inlineTemplateProp.loc)) {
            const loc = getSelection(context, element.loc.end);
            inlineTemplateProp.value = {
                type: 2 /* TEXT */,
                content: loc.source,
                loc
            };
        }
    }
    element.children = children;
    // End tag.
    if (startsWithEndTagOpen(context.source, element.tag)) {
        parseTag(context, 1 /* End */, parent);
    }
    else {
        emitError(context, 24 /* X_MISSING_END_TAG */, 0, element.loc.start);
        if (context.source.length === 0 && element.tag.toLowerCase() === 'script') {
            const first = children[0];
            if (first && startsWith(first.loc.source, '<!--')) {
                emitError(context, 8 /* EOF_IN_SCRIPT_HTML_COMMENT_LIKE_TEXT */);
            }
        }
    }
    element.loc = getSelection(context, element.loc.start);
    if (isPreBoundary) {
        context.inPre = false;
    }
    if (isVPreBoundary) {
        context.inVPre = false;
    }
    return element;
}
const isSpecialTemplateDirective = /*#__PURE__*/ makeMap(`if,else,else-if,for,slot`);
function parseTag(context, type, parent) {
    // Tag open.
    const start = getCursor(context);
    const match = /^<\/?([a-z][^\t\r\n\f />]*)/i.exec(context.source);
    const tag = match[1];
    const ns = context.options.getNamespace(tag, parent);
    advanceBy(context, match[0].length);
    advanceSpaces(context);
    // save current state in case we need to re-parse attributes with v-pre
    const cursor = getCursor(context);
    const currentSource = context.source;
    // check <pre> tag
    if (context.options.isPreTag(tag)) {
        context.inPre = true;
    }
    // Attributes.
    let props = parseAttributes(context, type);
    // check v-pre
    if (type === 0 /* Start */ &&
        !context.inVPre &&
        props.some(p => p.type === 7 /* DIRECTIVE */ && p.name === 'pre')) {
        context.inVPre = true;
        // reset context
        extend(context, cursor);
        context.source = currentSource;
        // re-parse attrs and filter out v-pre itself
        props = parseAttributes(context, type).filter(p => p.name !== 'v-pre');
    }
    // Tag close.
    let isSelfClosing = false;
    if (context.source.length === 0) {
        emitError(context, 9 /* EOF_IN_TAG */);
    }
    else {
        isSelfClosing = startsWith(context.source, '/>');
        if (type === 1 /* End */ && isSelfClosing) {
            emitError(context, 4 /* END_TAG_WITH_TRAILING_SOLIDUS */);
        }
        advanceBy(context, isSelfClosing ? 2 : 1);
    }
    if (type === 1 /* End */) {
        return;
    }
    // 2.x deprecation checks
    if (isCompatEnabled("COMPILER_V_IF_V_FOR_PRECEDENCE" /* COMPILER_V_IF_V_FOR_PRECEDENCE */, context)) {
        let hasIf = false;
        let hasFor = false;
        for (let i = 0; i < props.length; i++) {
            const p = props[i];
            if (p.type === 7 /* DIRECTIVE */) {
                if (p.name === 'if') {
                    hasIf = true;
                }
                else if (p.name === 'for') {
                    hasFor = true;
                }
            }
            if (hasIf && hasFor) {
                warnDeprecation("COMPILER_V_IF_V_FOR_PRECEDENCE" /* COMPILER_V_IF_V_FOR_PRECEDENCE */, context, getSelection(context, start));
            }
        }
    }
    let tagType = 0 /* ELEMENT */;
    if (!context.inVPre) {
        if (tag === 'slot') {
            tagType = 2 /* SLOT */;
        }
        else if (tag === 'template') {
            if (props.some(p => p.type === 7 /* DIRECTIVE */ && isSpecialTemplateDirective(p.name))) {
                tagType = 3 /* TEMPLATE */;
            }
        }
        else if (isComponent(tag, props, context)) {
            tagType = 1 /* COMPONENT */;
        }
    }
    return {
        type: 1 /* ELEMENT */,
        ns,
        tag,
        tagType,
        props,
        isSelfClosing,
        children: [],
        loc: getSelection(context, start),
        codegenNode: undefined // to be created during transform phase
    };
}
function isComponent(tag, props, context) {
    const options = context.options;
    if (options.isCustomElement(tag)) {
        return false;
    }
    if (tag === 'component' ||
        /^[A-Z]/.test(tag) ||
        isCoreComponent(tag) ||
        (options.isBuiltInComponent && options.isBuiltInComponent(tag)) ||
        (options.isNativeTag && !options.isNativeTag(tag))) {
        return true;
    }
    // at this point the tag should be a native tag, but check for potential "is"
    // casting
    for (let i = 0; i < props.length; i++) {
        const p = props[i];
        if (p.type === 6 /* ATTRIBUTE */) {
            if (p.name === 'is' && p.value) {
                if (p.value.content.startsWith('vue:')) {
                    return true;
                }
                else if (checkCompatEnabled("COMPILER_IS_ON_ELEMENT" /* COMPILER_IS_ON_ELEMENT */, context, p.loc)) {
                    return true;
                }
            }
        }
        else {
            // directive
            // v-is (TODO Deprecate)
            if (p.name === 'is') {
                return true;
            }
            else if (
            // :is on plain element - only treat as component in compat mode
            p.name === 'bind' &&
                isBindKey(p.arg, 'is') &&
                true &&
                checkCompatEnabled("COMPILER_IS_ON_ELEMENT" /* COMPILER_IS_ON_ELEMENT */, context, p.loc)) {
                return true;
            }
        }
    }
}
function parseAttributes(context, type) {
    const props = [];
    const attributeNames = new Set();
    while (context.source.length > 0 &&
        !startsWith(context.source, '>') &&
        !startsWith(context.source, '/>')) {
        if (startsWith(context.source, '/')) {
            emitError(context, 22 /* UNEXPECTED_SOLIDUS_IN_TAG */);
            advanceBy(context, 1);
            advanceSpaces(context);
            continue;
        }
        if (type === 1 /* End */) {
            emitError(context, 3 /* END_TAG_WITH_ATTRIBUTES */);
        }
        const attr = parseAttribute(context, attributeNames);
        if (type === 0 /* Start */) {
            props.push(attr);
        }
        if (/^[^\t\r\n\f />]/.test(context.source)) {
            emitError(context, 15 /* MISSING_WHITESPACE_BETWEEN_ATTRIBUTES */);
        }
        advanceSpaces(context);
    }
    return props;
}
function parseAttribute(context, nameSet) {
    // Name.
    const start = getCursor(context);
    const match = /^[^\t\r\n\f />][^\t\r\n\f />=]*/.exec(context.source);
    const name = match[0];
    if (nameSet.has(name)) {
        emitError(context, 2 /* DUPLICATE_ATTRIBUTE */);
    }
    nameSet.add(name);
    if (name[0] === '=') {
        emitError(context, 19 /* UNEXPECTED_EQUALS_SIGN_BEFORE_ATTRIBUTE_NAME */);
    }
    {
        const pattern = /["'<]/g;
        let m;
        while ((m = pattern.exec(name))) {
            emitError(context, 17 /* UNEXPECTED_CHARACTER_IN_ATTRIBUTE_NAME */, m.index);
        }
    }
    advanceBy(context, name.length);
    // Value
    let value = undefined;
    if (/^[\t\r\n\f ]*=/.test(context.source)) {
        advanceSpaces(context);
        advanceBy(context, 1);
        advanceSpaces(context);
        value = parseAttributeValue(context);
        if (!value) {
            emitError(context, 13 /* MISSING_ATTRIBUTE_VALUE */);
        }
    }
    const loc = getSelection(context, start);
    if (!context.inVPre && /^(v-[A-Za-z0-9-]|:|\.|@|#)/.test(name)) {
        const match = /(?:^v-([a-z0-9-]+))?(?:(?::|^\.|^@|^#)(\[[^\]]+\]|[^\.]+))?(.+)?$/i.exec(name);
        let isPropShorthand = startsWith(name, '.');
        let dirName = match[1] ||
            (isPropShorthand || startsWith(name, ':')
                ? 'bind'
                : startsWith(name, '@')
                    ? 'on'
                    : 'slot');
        let arg;
        if (match[2]) {
            const isSlot = dirName === 'slot';
            const startOffset = name.lastIndexOf(match[2]);
            const loc = getSelection(context, getNewPosition(context, start, startOffset), getNewPosition(context, start, startOffset + match[2].length + ((isSlot && match[3]) || '').length));
            let content = match[2];
            let isStatic = true;
            if (content.startsWith('[')) {
                isStatic = false;
                if (!content.endsWith(']')) {
                    emitError(context, 27 /* X_MISSING_DYNAMIC_DIRECTIVE_ARGUMENT_END */);
                }
                content = content.substr(1, content.length - 2);
            }
            else if (isSlot) {
                // #1241 special case for v-slot: vuetify relies extensively on slot
                // names containing dots. v-slot doesn't have any modifiers and Vue 2.x
                // supports such usage so we are keeping it consistent with 2.x.
                content += match[3] || '';
            }
            arg = {
                type: 4 /* SIMPLE_EXPRESSION */,
                content,
                isStatic,
                constType: isStatic
                    ? 3 /* CAN_STRINGIFY */
                    : 0 /* NOT_CONSTANT */,
                loc
            };
        }
        if (value && value.isQuoted) {
            const valueLoc = value.loc;
            valueLoc.start.offset++;
            valueLoc.start.column++;
            valueLoc.end = advancePositionWithClone(valueLoc.start, value.content);
            valueLoc.source = valueLoc.source.slice(1, -1);
        }
        const modifiers = match[3] ? match[3].substr(1).split('.') : [];
        if (isPropShorthand)
            modifiers.push('prop');
        // 2.x compat v-bind:foo.sync -> v-model:foo
        if (dirName === 'bind' && arg) {
            if (modifiers.includes('sync') &&
                checkCompatEnabled("COMPILER_V_BIND_SYNC" /* COMPILER_V_BIND_SYNC */, context, loc, arg.loc.source)) {
                dirName = 'model';
                modifiers.splice(modifiers.indexOf('sync'), 1);
            }
            if (modifiers.includes('prop')) {
                checkCompatEnabled("COMPILER_V_BIND_PROP" /* COMPILER_V_BIND_PROP */, context, loc);
            }
        }
        return {
            type: 7 /* DIRECTIVE */,
            name: dirName,
            exp: value && {
                type: 4 /* SIMPLE_EXPRESSION */,
                content: value.content,
                isStatic: false,
                // Treat as non-constant by default. This can be potentially set to
                // other values by `transformExpression` to make it eligible for hoisting.
                constType: 0 /* NOT_CONSTANT */,
                loc: value.loc
            },
            arg,
            modifiers,
            loc
        };
    }
    // missing directive name or illegal directive name
    if (!context.inVPre && startsWith(name, 'v-')) {
        emitError(context, 26 /* X_MISSING_DIRECTIVE_NAME */);
    }
    return {
        type: 6 /* ATTRIBUTE */,
        name,
        value: value && {
            type: 2 /* TEXT */,
            content: value.content,
            loc: value.loc
        },
        loc
    };
}
function parseAttributeValue(context) {
    const start = getCursor(context);
    let content;
    const quote = context.source[0];
    const isQuoted = quote === `"` || quote === `'`;
    if (isQuoted) {
        // Quoted value.
        advanceBy(context, 1);
        const endIndex = context.source.indexOf(quote);
        if (endIndex === -1) {
            content = parseTextData(context, context.source.length, 4 /* ATTRIBUTE_VALUE */);
        }
        else {
            content = parseTextData(context, endIndex, 4 /* ATTRIBUTE_VALUE */);
            advanceBy(context, 1);
        }
    }
    else {
        // Unquoted
        const match = /^[^\t\r\n\f >]+/.exec(context.source);
        if (!match) {
            return undefined;
        }
        const unexpectedChars = /["'<=`]/g;
        let m;
        while ((m = unexpectedChars.exec(match[0]))) {
            emitError(context, 18 /* UNEXPECTED_CHARACTER_IN_UNQUOTED_ATTRIBUTE_VALUE */, m.index);
        }
        content = parseTextData(context, match[0].length, 4 /* ATTRIBUTE_VALUE */);
    }
    return { content, isQuoted, loc: getSelection(context, start) };
}
function parseInterpolation(context, mode) {
    const [open, close] = context.options.delimiters;
    const closeIndex = context.source.indexOf(close, open.length);
    if (closeIndex === -1) {
        emitError(context, 25 /* X_MISSING_INTERPOLATION_END */);
        return undefined;
    }
    const start = getCursor(context);
    advanceBy(context, open.length);
    const innerStart = getCursor(context);
    const innerEnd = getCursor(context);
    const rawContentLength = closeIndex - open.length;
    const rawContent = context.source.slice(0, rawContentLength);
    const preTrimContent = parseTextData(context, rawContentLength, mode);
    const content = preTrimContent.trim();
    const startOffset = preTrimContent.indexOf(content);
    if (startOffset > 0) {
        advancePositionWithMutation(innerStart, rawContent, startOffset);
    }
    const endOffset = rawContentLength - (preTrimContent.length - content.length - startOffset);
    advancePositionWithMutation(innerEnd, rawContent, endOffset);
    advanceBy(context, close.length);
    return {
        type: 5 /* INTERPOLATION */,
        content: {
            type: 4 /* SIMPLE_EXPRESSION */,
            isStatic: false,
            // Set `isConstant` to false by default and will decide in transformExpression
            constType: 0 /* NOT_CONSTANT */,
            content,
            loc: getSelection(context, innerStart, innerEnd)
        },
        loc: getSelection(context, start)
    };
}
function parseText(context, mode) {
    const endTokens = mode === 3 /* CDATA */ ? [']]>'] : ['<', context.options.delimiters[0]];
    let endIndex = context.source.length;
    for (let i = 0; i < endTokens.length; i++) {
        const index = context.source.indexOf(endTokens[i], 1);
        if (index !== -1 && endIndex > index) {
            endIndex = index;
        }
    }
    const start = getCursor(context);
    const content = parseTextData(context, endIndex, mode);
    return {
        type: 2 /* TEXT */,
        content,
        loc: getSelection(context, start)
    };
}
/**
 * Get text data with a given length from the current location.
 * This translates HTML entities in the text data.
 */
function parseTextData(context, length, mode) {
    const rawText = context.source.slice(0, length);
    advanceBy(context, length);
    if (mode === 2 /* RAWTEXT */ ||
        mode === 3 /* CDATA */ ||
        rawText.indexOf('&') === -1) {
        return rawText;
    }
    else {
        // DATA or RCDATA containing "&"". Entity decoding required.
        return context.options.decodeEntities(rawText, mode === 4 /* ATTRIBUTE_VALUE */);
    }
}
function getCursor(context) {
    const { column, line, offset } = context;
    return { column, line, offset };
}
function getSelection(context, start, end) {
    end = end || getCursor(context);
    return {
        start,
        end,
        source: context.originalSource.slice(start.offset, end.offset)
    };
}
function last(xs) {
    return xs[xs.length - 1];
}
function startsWith(source, searchString) {
    return source.startsWith(searchString);
}
function advanceBy(context, numberOfCharacters) {
    const { source } = context;
    advancePositionWithMutation(context, source, numberOfCharacters);
    context.source = source.slice(numberOfCharacters);
}
function advanceSpaces(context) {
    const match = /^[\t\r\n\f ]+/.exec(context.source);
    if (match) {
        advanceBy(context, match[0].length);
    }
}
function getNewPosition(context, start, numberOfCharacters) {
    return advancePositionWithClone(start, context.originalSource.slice(start.offset, numberOfCharacters), numberOfCharacters);
}
function emitError(context, code, offset, loc = getCursor(context)) {
    if (offset) {
        loc.offset += offset;
        loc.column += offset;
    }
    context.options.onError(createCompilerError(code, {
        start: loc,
        end: loc,
        source: ''
    }));
}
function isEnd(context, mode, ancestors) {
    const s = context.source;
    switch (mode) {
        case 0 /* DATA */:
            if (startsWith(s, '</')) {
                // TODO: probably bad performance
                for (let i = ancestors.length - 1; i >= 0; --i) {
                    if (startsWithEndTagOpen(s, ancestors[i].tag)) {
                        return true;
                    }
                }
            }
            break;
        case 1 /* RCDATA */:
        case 2 /* RAWTEXT */: {
            const parent = last(ancestors);
            if (parent && startsWithEndTagOpen(s, parent.tag)) {
                return true;
            }
            break;
        }
        case 3 /* CDATA */:
            if (startsWith(s, ']]>')) {
                return true;
            }
            break;
    }
    return !s;
}
function startsWithEndTagOpen(source, tag) {
    return (startsWith(source, '</') &&
        source.substr(2, tag.length).toLowerCase() === tag.toLowerCase() &&
        /[\t\r\n\f />]/.test(source[2 + tag.length] || '>'));
}

function hoistStatic(root, context) {
    walk(root, context, 
    // Root node is unfortunately non-hoistable due to potential parent
    // fallthrough attributes.
    isSingleElementRoot(root, root.children[0]));
}
function isSingleElementRoot(root, child) {
    const { children } = root;
    return (children.length === 1 &&
        child.type === 1 /* ELEMENT */ &&
        !isSlotOutlet(child));
}
function walk(node, context, doNotHoistNode = false) {
    // Some transforms, e.g. transformAssetUrls from @vue/compiler-sfc, replaces
    // static bindings with expressions. These expressions are guaranteed to be
    // constant so they are still eligible for hoisting, but they are only
    // available at runtime and therefore cannot be evaluated ahead of time.
    // This is only a concern for pre-stringification (via transformHoist by
    // @vue/compiler-dom), but doing it here allows us to perform only one full
    // walk of the AST and allow `stringifyStatic` to stop walking as soon as its
    // stringficiation threshold is met.
    let canStringify = true;
    const { children } = node;
    const originalCount = children.length;
    let hoistedCount = 0;
    for (let i = 0; i < children.length; i++) {
        const child = children[i];
        // only plain elements & text calls are eligible for hoisting.
        if (child.type === 1 /* ELEMENT */ &&
            child.tagType === 0 /* ELEMENT */) {
            const constantType = doNotHoistNode
                ? 0 /* NOT_CONSTANT */
                : getConstantType(child, context);
            if (constantType > 0 /* NOT_CONSTANT */) {
                if (constantType < 3 /* CAN_STRINGIFY */) {
                    canStringify = false;
                }
                if (constantType >= 2 /* CAN_HOIST */) {
                    child.codegenNode.patchFlag =
                        -1 /* HOISTED */ + (` /* HOISTED */` );
                    child.codegenNode = context.hoist(child.codegenNode);
                    hoistedCount++;
                    continue;
                }
            }
            else {
                // node may contain dynamic children, but its props may be eligible for
                // hoisting.
                const codegenNode = child.codegenNode;
                if (codegenNode.type === 13 /* VNODE_CALL */) {
                    const flag = getPatchFlag(codegenNode);
                    if ((!flag ||
                        flag === 512 /* NEED_PATCH */ ||
                        flag === 1 /* TEXT */) &&
                        getGeneratedPropsConstantType(child, context) >=
                            2 /* CAN_HOIST */) {
                        const props = getNodeProps(child);
                        if (props) {
                            codegenNode.props = context.hoist(props);
                        }
                    }
                    if (codegenNode.dynamicProps) {
                        codegenNode.dynamicProps = context.hoist(codegenNode.dynamicProps);
                    }
                }
            }
        }
        else if (child.type === 12 /* TEXT_CALL */) {
            const contentType = getConstantType(child.content, context);
            if (contentType > 0) {
                if (contentType < 3 /* CAN_STRINGIFY */) {
                    canStringify = false;
                }
                if (contentType >= 2 /* CAN_HOIST */) {
                    child.codegenNode = context.hoist(child.codegenNode);
                    hoistedCount++;
                }
            }
        }
        // walk further
        if (child.type === 1 /* ELEMENT */) {
            const isComponent = child.tagType === 1 /* COMPONENT */;
            if (isComponent) {
                context.scopes.vSlot++;
            }
            walk(child, context);
            if (isComponent) {
                context.scopes.vSlot--;
            }
        }
        else if (child.type === 11 /* FOR */) {
            // Do not hoist v-for single child because it has to be a block
            walk(child, context, child.children.length === 1);
        }
        else if (child.type === 9 /* IF */) {
            for (let i = 0; i < child.branches.length; i++) {
                // Do not hoist v-if single child because it has to be a block
                walk(child.branches[i], context, child.branches[i].children.length === 1);
            }
        }
    }
    if (canStringify && hoistedCount && context.transformHoist) {
        context.transformHoist(children, context, node);
    }
    // all children were hoisted - the entire children array is hoistable.
    if (hoistedCount &&
        hoistedCount === originalCount &&
        node.type === 1 /* ELEMENT */ &&
        node.tagType === 0 /* ELEMENT */ &&
        node.codegenNode &&
        node.codegenNode.type === 13 /* VNODE_CALL */ &&
        isArray(node.codegenNode.children)) {
        node.codegenNode.children = context.hoist(createArrayExpression(node.codegenNode.children));
    }
}
function getConstantType(node, context) {
    const { constantCache } = context;
    switch (node.type) {
        case 1 /* ELEMENT */:
            if (node.tagType !== 0 /* ELEMENT */) {
                return 0 /* NOT_CONSTANT */;
            }
            const cached = constantCache.get(node);
            if (cached !== undefined) {
                return cached;
            }
            const codegenNode = node.codegenNode;
            if (codegenNode.type !== 13 /* VNODE_CALL */) {
                return 0 /* NOT_CONSTANT */;
            }
            const flag = getPatchFlag(codegenNode);
            if (!flag) {
                let returnType = 3 /* CAN_STRINGIFY */;
                // Element itself has no patch flag. However we still need to check:
                // 1. Even for a node with no patch flag, it is possible for it to contain
                // non-hoistable expressions that refers to scope variables, e.g. compiler
                // injected keys or cached event handlers. Therefore we need to always
                // check the codegenNode's props to be sure.
                const generatedPropsType = getGeneratedPropsConstantType(node, context);
                if (generatedPropsType === 0 /* NOT_CONSTANT */) {
                    constantCache.set(node, 0 /* NOT_CONSTANT */);
                    return 0 /* NOT_CONSTANT */;
                }
                if (generatedPropsType < returnType) {
                    returnType = generatedPropsType;
                }
                // 2. its children.
                for (let i = 0; i < node.children.length; i++) {
                    const childType = getConstantType(node.children[i], context);
                    if (childType === 0 /* NOT_CONSTANT */) {
                        constantCache.set(node, 0 /* NOT_CONSTANT */);
                        return 0 /* NOT_CONSTANT */;
                    }
                    if (childType < returnType) {
                        returnType = childType;
                    }
                }
                // 3. if the type is not already CAN_SKIP_PATCH which is the lowest non-0
                // type, check if any of the props can cause the type to be lowered
                // we can skip can_patch because it's guaranteed by the absence of a
                // patchFlag.
                if (returnType > 1 /* CAN_SKIP_PATCH */) {
                    for (let i = 0; i < node.props.length; i++) {
                        const p = node.props[i];
                        if (p.type === 7 /* DIRECTIVE */ && p.name === 'bind' && p.exp) {
                            const expType = getConstantType(p.exp, context);
                            if (expType === 0 /* NOT_CONSTANT */) {
                                constantCache.set(node, 0 /* NOT_CONSTANT */);
                                return 0 /* NOT_CONSTANT */;
                            }
                            if (expType < returnType) {
                                returnType = expType;
                            }
                        }
                    }
                }
                // only svg/foreignObject could be block here, however if they are
                // static then they don't need to be blocks since there will be no
                // nested updates.
                if (codegenNode.isBlock) {
                    context.removeHelper(OPEN_BLOCK);
                    context.removeHelper(getVNodeBlockHelper(context.inSSR, codegenNode.isComponent));
                    codegenNode.isBlock = false;
                    context.helper(getVNodeHelper(context.inSSR, codegenNode.isComponent));
                }
                constantCache.set(node, returnType);
                return returnType;
            }
            else {
                constantCache.set(node, 0 /* NOT_CONSTANT */);
                return 0 /* NOT_CONSTANT */;
            }
        case 2 /* TEXT */:
        case 3 /* COMMENT */:
            return 3 /* CAN_STRINGIFY */;
        case 9 /* IF */:
        case 11 /* FOR */:
        case 10 /* IF_BRANCH */:
            return 0 /* NOT_CONSTANT */;
        case 5 /* INTERPOLATION */:
        case 12 /* TEXT_CALL */:
            return getConstantType(node.content, context);
        case 4 /* SIMPLE_EXPRESSION */:
            return node.constType;
        case 8 /* COMPOUND_EXPRESSION */:
            let returnType = 3 /* CAN_STRINGIFY */;
            for (let i = 0; i < node.children.length; i++) {
                const child = node.children[i];
                if (isString(child) || isSymbol(child)) {
                    continue;
                }
                const childType = getConstantType(child, context);
                if (childType === 0 /* NOT_CONSTANT */) {
                    return 0 /* NOT_CONSTANT */;
                }
                else if (childType < returnType) {
                    returnType = childType;
                }
            }
            return returnType;
        default:
            return 0 /* NOT_CONSTANT */;
    }
}
const allowHoistedHelperSet = new Set([
    NORMALIZE_CLASS,
    NORMALIZE_STYLE,
    NORMALIZE_PROPS,
    GUARD_REACTIVE_PROPS
]);
function getConstantTypeOfHelperCall(value, context) {
    if (value.type === 14 /* JS_CALL_EXPRESSION */ &&
        !isString(value.callee) &&
        allowHoistedHelperSet.has(value.callee)) {
        const arg = value.arguments[0];
        if (arg.type === 4 /* SIMPLE_EXPRESSION */) {
            return getConstantType(arg, context);
        }
        else if (arg.type === 14 /* JS_CALL_EXPRESSION */) {
            // in the case of nested helper call, e.g. `normalizeProps(guardReactiveProps(exp))`
            return getConstantTypeOfHelperCall(arg, context);
        }
    }
    return 0 /* NOT_CONSTANT */;
}
function getGeneratedPropsConstantType(node, context) {
    let returnType = 3 /* CAN_STRINGIFY */;
    const props = getNodeProps(node);
    if (props && props.type === 15 /* JS_OBJECT_EXPRESSION */) {
        const { properties } = props;
        for (let i = 0; i < properties.length; i++) {
            const { key, value } = properties[i];
            const keyType = getConstantType(key, context);
            if (keyType === 0 /* NOT_CONSTANT */) {
                return keyType;
            }
            if (keyType < returnType) {
                returnType = keyType;
            }
            let valueType;
            if (value.type === 4 /* SIMPLE_EXPRESSION */) {
                valueType = getConstantType(value, context);
            }
            else if (value.type === 14 /* JS_CALL_EXPRESSION */) {
                // some helper calls can be hoisted,
                // such as the `normalizeProps` generated by the compiler for pre-normalize class,
                // in this case we need to respect the ConstanType of the helper's argments
                valueType = getConstantTypeOfHelperCall(value, context);
            }
            else {
                valueType = 0 /* NOT_CONSTANT */;
            }
            if (valueType === 0 /* NOT_CONSTANT */) {
                return valueType;
            }
            if (valueType < returnType) {
                returnType = valueType;
            }
        }
    }
    return returnType;
}
function getNodeProps(node) {
    const codegenNode = node.codegenNode;
    if (codegenNode.type === 13 /* VNODE_CALL */) {
        return codegenNode.props;
    }
}
function getPatchFlag(node) {
    const flag = node.patchFlag;
    return flag ? parseInt(flag, 10) : undefined;
}

function createTransformContext(root, { filename = '', prefixIdentifiers = false, hoistStatic = false, cacheHandlers = false, nodeTransforms = [], directiveTransforms = {}, transformHoist = null, isBuiltInComponent = NOOP, isCustomElement = NOOP, expressionPlugins = [], scopeId = null, slotted = true, ssr = false, inSSR = false, ssrCssVars = ``, bindingMetadata = EMPTY_OBJ, inline = false, isTS = false, onError = defaultOnError, onWarn = defaultOnWarn, compatConfig }) {
    const nameMatch = filename.replace(/\?.*$/, '').match(/([^/\\]+)\.\w+$/);
    const context = {
        // options
        selfName: nameMatch && capitalize(camelize(nameMatch[1])),
        prefixIdentifiers,
        hoistStatic,
        cacheHandlers,
        nodeTransforms,
        directiveTransforms,
        transformHoist,
        isBuiltInComponent,
        isCustomElement,
        expressionPlugins,
        scopeId,
        slotted,
        ssr,
        inSSR,
        ssrCssVars,
        bindingMetadata,
        inline,
        isTS,
        onError,
        onWarn,
        compatConfig,
        // state
        root,
        helpers: new Map(),
        components: new Set(),
        directives: new Set(),
        hoists: [],
        imports: [],
        constantCache: new Map(),
        temps: 0,
        cached: 0,
        identifiers: Object.create(null),
        scopes: {
            vFor: 0,
            vSlot: 0,
            vPre: 0,
            vOnce: 0
        },
        parent: null,
        currentNode: root,
        childIndex: 0,
        inVOnce: false,
        // methods
        helper(name) {
            const count = context.helpers.get(name) || 0;
            context.helpers.set(name, count + 1);
            return name;
        },
        removeHelper(name) {
            const count = context.helpers.get(name);
            if (count) {
                const currentCount = count - 1;
                if (!currentCount) {
                    context.helpers.delete(name);
                }
                else {
                    context.helpers.set(name, currentCount);
                }
            }
        },
        helperString(name) {
            return `_${helperNameMap[context.helper(name)]}`;
        },
        replaceNode(node) {
            /* istanbul ignore if */
            {
                if (!context.currentNode) {
                    throw new Error(`Node being replaced is already removed.`);
                }
                if (!context.parent) {
                    throw new Error(`Cannot replace root node.`);
                }
            }
            context.parent.children[context.childIndex] = context.currentNode = node;
        },
        removeNode(node) {
            if (!context.parent) {
                throw new Error(`Cannot remove root node.`);
            }
            const list = context.parent.children;
            const removalIndex = node
                ? list.indexOf(node)
                : context.currentNode
                    ? context.childIndex
                    : -1;
            /* istanbul ignore if */
            if (removalIndex < 0) {
                throw new Error(`node being removed is not a child of current parent`);
            }
            if (!node || node === context.currentNode) {
                // current node removed
                context.currentNode = null;
                context.onNodeRemoved();
            }
            else {
                // sibling node removed
                if (context.childIndex > removalIndex) {
                    context.childIndex--;
                    context.onNodeRemoved();
                }
            }
            context.parent.children.splice(removalIndex, 1);
        },
        onNodeRemoved: () => { },
        addIdentifiers(exp) {
        },
        removeIdentifiers(exp) {
        },
        hoist(exp) {
            if (isString(exp))
                exp = createSimpleExpression(exp);
            context.hoists.push(exp);
            const identifier = createSimpleExpression(`_hoisted_${context.hoists.length}`, false, exp.loc, 2 /* CAN_HOIST */);
            identifier.hoisted = exp;
            return identifier;
        },
        cache(exp, isVNode = false) {
            return createCacheExpression(context.cached++, exp, isVNode);
        }
    };
    {
        context.filters = new Set();
    }
    return context;
}
function transform(root, options) {
    const context = createTransformContext(root, options);
    traverseNode(root, context);
    if (options.hoistStatic) {
        hoistStatic(root, context);
    }
    if (!options.ssr) {
        createRootCodegen(root, context);
    }
    // finalize meta information
    root.helpers = [...context.helpers.keys()];
    root.components = [...context.components];
    root.directives = [...context.directives];
    root.imports = context.imports;
    root.hoists = context.hoists;
    root.temps = context.temps;
    root.cached = context.cached;
    {
        root.filters = [...context.filters];
    }
}
function createRootCodegen(root, context) {
    const { helper } = context;
    const { children } = root;
    if (children.length === 1) {
        const child = children[0];
        // if the single child is an element, turn it into a block.
        if (isSingleElementRoot(root, child) && child.codegenNode) {
            // single element root is never hoisted so codegenNode will never be
            // SimpleExpressionNode
            const codegenNode = child.codegenNode;
            if (codegenNode.type === 13 /* VNODE_CALL */) {
                makeBlock(codegenNode, context);
            }
            root.codegenNode = codegenNode;
        }
        else {
            // - single <slot/>, IfNode, ForNode: already blocks.
            // - single text node: always patched.
            // root codegen falls through via genNode()
            root.codegenNode = child;
        }
    }
    else if (children.length > 1) {
        // root has multiple nodes - return a fragment block.
        let patchFlag = 64 /* STABLE_FRAGMENT */;
        let patchFlagText = PatchFlagNames[64 /* STABLE_FRAGMENT */];
        // check if the fragment actually contains a single valid child with
        // the rest being comments
        if (children.filter(c => c.type !== 3 /* COMMENT */).length === 1) {
            patchFlag |= 2048 /* DEV_ROOT_FRAGMENT */;
            patchFlagText += `, ${PatchFlagNames[2048 /* DEV_ROOT_FRAGMENT */]}`;
        }
        root.codegenNode = createVNodeCall(context, helper(FRAGMENT), undefined, root.children, patchFlag + (` /* ${patchFlagText} */` ), undefined, undefined, true, undefined, false /* isComponent */);
    }
    else ;
}
function traverseChildren(parent, context) {
    let i = 0;
    const nodeRemoved = () => {
        i--;
    };
    for (; i < parent.children.length; i++) {
        const child = parent.children[i];
        if (isString(child))
            continue;
        context.parent = parent;
        context.childIndex = i;
        context.onNodeRemoved = nodeRemoved;
        traverseNode(child, context);
    }
}
function traverseNode(node, context) {
    context.currentNode = node;
    // apply transform plugins
    const { nodeTransforms } = context;
    const exitFns = [];
    for (let i = 0; i < nodeTransforms.length; i++) {
        const onExit = nodeTransforms[i](node, context);
        if (onExit) {
            if (isArray(onExit)) {
                exitFns.push(...onExit);
            }
            else {
                exitFns.push(onExit);
            }
        }
        if (!context.currentNode) {
            // node was removed
            return;
        }
        else {
            // node may have been replaced
            node = context.currentNode;
        }
    }
    switch (node.type) {
        case 3 /* COMMENT */:
            if (!context.ssr) {
                // inject import for the Comment symbol, which is needed for creating
                // comment nodes with `createVNode`
                context.helper(CREATE_COMMENT);
            }
            break;
        case 5 /* INTERPOLATION */:
            // no need to traverse, but we need to inject toString helper
            if (!context.ssr) {
                context.helper(TO_DISPLAY_STRING);
            }
            break;
        // for container types, further traverse downwards
        case 9 /* IF */:
            for (let i = 0; i < node.branches.length; i++) {
                traverseNode(node.branches[i], context);
            }
            break;
        case 10 /* IF_BRANCH */:
        case 11 /* FOR */:
        case 1 /* ELEMENT */:
        case 0 /* ROOT */:
            traverseChildren(node, context);
            break;
    }
    // exit transforms
    context.currentNode = node;
    let i = exitFns.length;
    while (i--) {
        exitFns[i]();
    }
}
function createStructuralDirectiveTransform(name, fn) {
    const matches = isString(name)
        ? (n) => n === name
        : (n) => name.test(n);
    return (node, context) => {
        if (node.type === 1 /* ELEMENT */) {
            const { props } = node;
            // structural directive transforms are not concerned with slots
            // as they are handled separately in vSlot.ts
            if (node.tagType === 3 /* TEMPLATE */ && props.some(isVSlot)) {
                return;
            }
            const exitFns = [];
            for (let i = 0; i < props.length; i++) {
                const prop = props[i];
                if (prop.type === 7 /* DIRECTIVE */ && matches(prop.name)) {
                    // structural directives are removed to avoid infinite recursion
                    // also we remove them *before* applying so that it can further
                    // traverse itself in case it moves the node around
                    props.splice(i, 1);
                    i--;
                    const onExit = fn(node, prop, context);
                    if (onExit)
                        exitFns.push(onExit);
                }
            }
            return exitFns;
        }
    };
}

const PURE_ANNOTATION = `/*#__PURE__*/`;
function createCodegenContext(ast, { mode = 'function', prefixIdentifiers = mode === 'module', sourceMap = false, filename = `template.vue.html`, scopeId = null, optimizeImports = false, runtimeGlobalName = `Vue`, runtimeModuleName = `vue`, ssr = false, isTS = false, inSSR = false }) {
    const context = {
        mode,
        prefixIdentifiers,
        sourceMap,
        filename,
        scopeId,
        optimizeImports,
        runtimeGlobalName,
        runtimeModuleName,
        ssr,
        isTS,
        inSSR,
        source: ast.loc.source,
        code: ``,
        column: 1,
        line: 1,
        offset: 0,
        indentLevel: 0,
        pure: false,
        map: undefined,
        helper(key) {
            return `_${helperNameMap[key]}`;
        },
        push(code, node) {
            context.code += code;
        },
        indent() {
            newline(++context.indentLevel);
        },
        deindent(withoutNewLine = false) {
            if (withoutNewLine) {
                --context.indentLevel;
            }
            else {
                newline(--context.indentLevel);
            }
        },
        newline() {
            newline(context.indentLevel);
        }
    };
    function newline(n) {
        context.push('\n' + `  `.repeat(n));
    }
    return context;
}
function generate(ast, options = {}) {
    const context = createCodegenContext(ast, options);
    if (options.onContextCreated)
        options.onContextCreated(context);
    const { mode, push, prefixIdentifiers, indent, deindent, newline, scopeId, ssr } = context;
    const hasHelpers = ast.helpers.length > 0;
    const useWithBlock = !prefixIdentifiers && mode !== 'module';
    // preambles
    // in setup() inline mode, the preamble is generated in a sub context
    // and returned separately.
    const preambleContext = context;
    {
        genFunctionPreamble(ast, preambleContext);
    }
    // enter render function
    const functionName = ssr ? `ssrRender` : `render`;
    const args = ssr ? ['_ctx', '_push', '_parent', '_attrs'] : ['_ctx', '_cache'];
    const signature = args.join(', ');
    {
        push(`function ${functionName}(${signature}) {`);
    }
    indent();
    if (useWithBlock) {
        push(`with (_ctx) {`);
        indent();
        // function mode const declarations should be inside with block
        // also they should be renamed to avoid collision with user properties
        if (hasHelpers) {
            push(`const { ${ast.helpers
                .map(s => `${helperNameMap[s]}: _${helperNameMap[s]}`)
                .join(', ')} } = _Vue`);
            push(`\n`);
            newline();
        }
    }
    // generate asset resolution statements
    if (ast.components.length) {
        genAssets(ast.components, 'component', context);
        if (ast.directives.length || ast.temps > 0) {
            newline();
        }
    }
    if (ast.directives.length) {
        genAssets(ast.directives, 'directive', context);
        if (ast.temps > 0) {
            newline();
        }
    }
    if (ast.filters && ast.filters.length) {
        newline();
        genAssets(ast.filters, 'filter', context);
        newline();
    }
    if (ast.temps > 0) {
        push(`let `);
        for (let i = 0; i < ast.temps; i++) {
            push(`${i > 0 ? `, ` : ``}_temp${i}`);
        }
    }
    if (ast.components.length || ast.directives.length || ast.temps) {
        push(`\n`);
        newline();
    }
    // generate the VNode tree expression
    if (!ssr) {
        push(`return `);
    }
    if (ast.codegenNode) {
        genNode(ast.codegenNode, context);
    }
    else {
        push(`null`);
    }
    if (useWithBlock) {
        deindent();
        push(`}`);
    }
    deindent();
    push(`}`);
    return {
        ast,
        code: context.code,
        preamble: ``,
        // SourceMapGenerator does have toJSON() method but it's not in the types
        map: context.map ? context.map.toJSON() : undefined
    };
}
function genFunctionPreamble(ast, context) {
    const { ssr, prefixIdentifiers, push, newline, runtimeModuleName, runtimeGlobalName } = context;
    const VueBinding = runtimeGlobalName;
    const aliasHelper = (s) => `${helperNameMap[s]}: _${helperNameMap[s]}`;
    // Generate const declaration for helpers
    // In prefix mode, we place the const declaration at top so it's done
    // only once; But if we not prefixing, we place the declaration inside the
    // with block so it doesn't incur the `in` check cost for every helper access.
    if (ast.helpers.length > 0) {
        {
            // "with" mode.
            // save Vue in a separate variable to avoid collision
            push(`const _Vue = ${VueBinding}\n`);
            // in "with" mode, helpers are declared inside the with block to avoid
            // has check cost, but hoists are lifted out of the function - we need
            // to provide the helper here.
            if (ast.hoists.length) {
                const staticHelpers = [
                    CREATE_VNODE,
                    CREATE_ELEMENT_VNODE,
                    CREATE_COMMENT,
                    CREATE_TEXT,
                    CREATE_STATIC
                ]
                    .filter(helper => ast.helpers.includes(helper))
                    .map(aliasHelper)
                    .join(', ');
                push(`const { ${staticHelpers} } = _Vue\n`);
            }
        }
    }
    genHoists(ast.hoists, context);
    newline();
    push(`return `);
}
function genAssets(assets, type, { helper, push, newline, isTS }) {
    const resolver = helper(type === 'filter'
        ? RESOLVE_FILTER
        : type === 'component'
            ? RESOLVE_COMPONENT
            : RESOLVE_DIRECTIVE);
    for (let i = 0; i < assets.length; i++) {
        let id = assets[i];
        // potential component implicit self-reference inferred from SFC filename
        const maybeSelfReference = id.endsWith('__self');
        if (maybeSelfReference) {
            id = id.slice(0, -6);
        }
        push(`const ${toValidAssetId(id, type)} = ${resolver}(${JSON.stringify(id)}${maybeSelfReference ? `, true` : ``})${isTS ? `!` : ``}`);
        if (i < assets.length - 1) {
            newline();
        }
    }
}
function genHoists(hoists, context) {
    if (!hoists.length) {
        return;
    }
    context.pure = true;
    const { push, newline, helper, scopeId, mode } = context;
    newline();
    hoists.forEach((exp, i) => {
        if (exp) {
            push(`const _hoisted_${i + 1} = `);
            genNode(exp, context);
            newline();
        }
    });
    context.pure = false;
}
function isText$1(n) {
    return (isString(n) ||
        n.type === 4 /* SIMPLE_EXPRESSION */ ||
        n.type === 2 /* TEXT */ ||
        n.type === 5 /* INTERPOLATION */ ||
        n.type === 8 /* COMPOUND_EXPRESSION */);
}
function genNodeListAsArray(nodes, context) {
    const multilines = nodes.length > 3 ||
        (nodes.some(n => isArray(n) || !isText$1(n)));
    context.push(`[`);
    multilines && context.indent();
    genNodeList(nodes, context, multilines);
    multilines && context.deindent();
    context.push(`]`);
}
function genNodeList(nodes, context, multilines = false, comma = true) {
    const { push, newline } = context;
    for (let i = 0; i < nodes.length; i++) {
        const node = nodes[i];
        if (isString(node)) {
            push(node);
        }
        else if (isArray(node)) {
            genNodeListAsArray(node, context);
        }
        else {
            genNode(node, context);
        }
        if (i < nodes.length - 1) {
            if (multilines) {
                comma && push(',');
                newline();
            }
            else {
                comma && push(', ');
            }
        }
    }
}
function genNode(node, context) {
    if (isString(node)) {
        context.push(node);
        return;
    }
    if (isSymbol(node)) {
        context.push(context.helper(node));
        return;
    }
    switch (node.type) {
        case 1 /* ELEMENT */:
        case 9 /* IF */:
        case 11 /* FOR */:
            assert(node.codegenNode != null, `Codegen node is missing for element/if/for node. ` +
                    `Apply appropriate transforms first.`);
            genNode(node.codegenNode, context);
            break;
        case 2 /* TEXT */:
            genText(node, context);
            break;
        case 4 /* SIMPLE_EXPRESSION */:
            genExpression(node, context);
            break;
        case 5 /* INTERPOLATION */:
            genInterpolation(node, context);
            break;
        case 12 /* TEXT_CALL */:
            genNode(node.codegenNode, context);
            break;
        case 8 /* COMPOUND_EXPRESSION */:
            genCompoundExpression(node, context);
            break;
        case 3 /* COMMENT */:
            genComment(node, context);
            break;
        case 13 /* VNODE_CALL */:
            genVNodeCall(node, context);
            break;
        case 14 /* JS_CALL_EXPRESSION */:
            genCallExpression(node, context);
            break;
        case 15 /* JS_OBJECT_EXPRESSION */:
            genObjectExpression(node, context);
            break;
        case 17 /* JS_ARRAY_EXPRESSION */:
            genArrayExpression(node, context);
            break;
        case 18 /* JS_FUNCTION_EXPRESSION */:
            genFunctionExpression(node, context);
            break;
        case 19 /* JS_CONDITIONAL_EXPRESSION */:
            genConditionalExpression(node, context);
            break;
        case 20 /* JS_CACHE_EXPRESSION */:
            genCacheExpression(node, context);
            break;
        case 21 /* JS_BLOCK_STATEMENT */:
            genNodeList(node.body, context, true, false);
            break;
        // SSR only types
        case 22 /* JS_TEMPLATE_LITERAL */:
            break;
        case 23 /* JS_IF_STATEMENT */:
            break;
        case 24 /* JS_ASSIGNMENT_EXPRESSION */:
            break;
        case 25 /* JS_SEQUENCE_EXPRESSION */:
            break;
        case 26 /* JS_RETURN_STATEMENT */:
            break;
        /* istanbul ignore next */
        case 10 /* IF_BRANCH */:
            // noop
            break;
        default:
            {
                assert(false, `unhandled codegen node type: ${node.type}`);
                // make sure we exhaust all possible types
                const exhaustiveCheck = node;
                return exhaustiveCheck;
            }
    }
}
function genText(node, context) {
    context.push(JSON.stringify(node.content), node);
}
function genExpression(node, context) {
    const { content, isStatic } = node;
    context.push(isStatic ? JSON.stringify(content) : content, node);
}
function genInterpolation(node, context) {
    const { push, helper, pure } = context;
    if (pure)
        push(PURE_ANNOTATION);
    push(`${helper(TO_DISPLAY_STRING)}(`);
    genNode(node.content, context);
    push(`)`);
}
function genCompoundExpression(node, context) {
    for (let i = 0; i < node.children.length; i++) {
        const child = node.children[i];
        if (isString(child)) {
            context.push(child);
        }
        else {
            genNode(child, context);
        }
    }
}
function genExpressionAsPropertyKey(node, context) {
    const { push } = context;
    if (node.type === 8 /* COMPOUND_EXPRESSION */) {
        push(`[`);
        genCompoundExpression(node, context);
        push(`]`);
    }
    else if (node.isStatic) {
        // only quote keys if necessary
        const text = isSimpleIdentifier(node.content)
            ? node.content
            : JSON.stringify(node.content);
        push(text, node);
    }
    else {
        push(`[${node.content}]`, node);
    }
}
function genComment(node, context) {
    const { push, helper, pure } = context;
    if (pure) {
        push(PURE_ANNOTATION);
    }
    push(`${helper(CREATE_COMMENT)}(${JSON.stringify(node.content)})`, node);
}
function genVNodeCall(node, context) {
    const { push, helper, pure } = context;
    const { tag, props, children, patchFlag, dynamicProps, directives, isBlock, disableTracking, isComponent } = node;
    if (directives) {
        push(helper(WITH_DIRECTIVES) + `(`);
    }
    if (isBlock) {
        push(`(${helper(OPEN_BLOCK)}(${disableTracking ? `true` : ``}), `);
    }
    if (pure) {
        push(PURE_ANNOTATION);
    }
    const callHelper = isBlock
        ? getVNodeBlockHelper(context.inSSR, isComponent)
        : getVNodeHelper(context.inSSR, isComponent);
    push(helper(callHelper) + `(`, node);
    genNodeList(genNullableArgs([tag, props, children, patchFlag, dynamicProps]), context);
    push(`)`);
    if (isBlock) {
        push(`)`);
    }
    if (directives) {
        push(`, `);
        genNode(directives, context);
        push(`)`);
    }
}
function genNullableArgs(args) {
    let i = args.length;
    while (i--) {
        if (args[i] != null)
            break;
    }
    return args.slice(0, i + 1).map(arg => arg || `null`);
}
// JavaScript
function genCallExpression(node, context) {
    const { push, helper, pure } = context;
    const callee = isString(node.callee) ? node.callee : helper(node.callee);
    if (pure) {
        push(PURE_ANNOTATION);
    }
    push(callee + `(`, node);
    genNodeList(node.arguments, context);
    push(`)`);
}
function genObjectExpression(node, context) {
    const { push, indent, deindent, newline } = context;
    const { properties } = node;
    if (!properties.length) {
        push(`{}`, node);
        return;
    }
    const multilines = properties.length > 1 ||
        (properties.some(p => p.value.type !== 4 /* SIMPLE_EXPRESSION */));
    push(multilines ? `{` : `{ `);
    multilines && indent();
    for (let i = 0; i < properties.length; i++) {
        const { key, value } = properties[i];
        // key
        genExpressionAsPropertyKey(key, context);
        push(`: `);
        // value
        genNode(value, context);
        if (i < properties.length - 1) {
            // will only reach this if it's multilines
            push(`,`);
            newline();
        }
    }
    multilines && deindent();
    push(multilines ? `}` : ` }`);
}
function genArrayExpression(node, context) {
    genNodeListAsArray(node.elements, context);
}
function genFunctionExpression(node, context) {
    const { push, indent, deindent } = context;
    const { params, returns, body, newline, isSlot } = node;
    if (isSlot) {
        // wrap slot functions with owner context
        push(`_${helperNameMap[WITH_CTX]}(`);
    }
    push(`(`, node);
    if (isArray(params)) {
        genNodeList(params, context);
    }
    else if (params) {
        genNode(params, context);
    }
    push(`) => `);
    if (newline || body) {
        push(`{`);
        indent();
    }
    if (returns) {
        if (newline) {
            push(`return `);
        }
        if (isArray(returns)) {
            genNodeListAsArray(returns, context);
        }
        else {
            genNode(returns, context);
        }
    }
    else if (body) {
        genNode(body, context);
    }
    if (newline || body) {
        deindent();
        push(`}`);
    }
    if (isSlot) {
        if (node.isNonScopedSlot) {
            push(`, undefined, true`);
        }
        push(`)`);
    }
}
function genConditionalExpression(node, context) {
    const { test, consequent, alternate, newline: needNewline } = node;
    const { push, indent, deindent, newline } = context;
    if (test.type === 4 /* SIMPLE_EXPRESSION */) {
        const needsParens = !isSimpleIdentifier(test.content);
        needsParens && push(`(`);
        genExpression(test, context);
        needsParens && push(`)`);
    }
    else {
        push(`(`);
        genNode(test, context);
        push(`)`);
    }
    needNewline && indent();
    context.indentLevel++;
    needNewline || push(` `);
    push(`? `);
    genNode(consequent, context);
    context.indentLevel--;
    needNewline && newline();
    needNewline || push(` `);
    push(`: `);
    const isNested = alternate.type === 19 /* JS_CONDITIONAL_EXPRESSION */;
    if (!isNested) {
        context.indentLevel++;
    }
    genNode(alternate, context);
    if (!isNested) {
        context.indentLevel--;
    }
    needNewline && deindent(true /* without newline */);
}
function genCacheExpression(node, context) {
    const { push, helper, indent, deindent, newline } = context;
    push(`_cache[${node.index}] || (`);
    if (node.isVNode) {
        indent();
        push(`${helper(SET_BLOCK_TRACKING)}(-1),`);
        newline();
    }
    push(`_cache[${node.index}] = `);
    genNode(node.value, context);
    if (node.isVNode) {
        push(`,`);
        newline();
        push(`${helper(SET_BLOCK_TRACKING)}(1),`);
        newline();
        push(`_cache[${node.index}]`);
        deindent();
    }
    push(`)`);
}

function walkIdentifiers(root, onIdentifier, includeAll = false, parentStack = [], knownIds = Object.create(null)) {
    {
        return;
    }
}
function isReferencedIdentifier(id, parent, parentStack) {
    {
        return false;
    }
}
function isInDestructureAssignment(parent, parentStack) {
    if (parent &&
        (parent.type === 'ObjectProperty' || parent.type === 'ArrayPattern')) {
        let i = parentStack.length;
        while (i--) {
            const p = parentStack[i];
            if (p.type === 'AssignmentExpression') {
                return true;
            }
            else if (p.type !== 'ObjectProperty' && !p.type.endsWith('Pattern')) {
                break;
            }
        }
    }
    return false;
}
function walkFunctionParams(node, onIdent) {
    for (const p of node.params) {
        for (const id of extractIdentifiers(p)) {
            onIdent(id);
        }
    }
}
function walkBlockDeclarations(block, onIdent) {
    for (const stmt of block.body) {
        if (stmt.type === 'VariableDeclaration') {
            if (stmt.declare)
                continue;
            for (const decl of stmt.declarations) {
                for (const id of extractIdentifiers(decl.id)) {
                    onIdent(id);
                }
            }
        }
        else if (stmt.type === 'FunctionDeclaration' ||
            stmt.type === 'ClassDeclaration') {
            if (stmt.declare || !stmt.id)
                continue;
            onIdent(stmt.id);
        }
    }
}
function extractIdentifiers(param, nodes = []) {
    switch (param.type) {
        case 'Identifier':
            nodes.push(param);
            break;
        case 'MemberExpression':
            let object = param;
            while (object.type === 'MemberExpression') {
                object = object.object;
            }
            nodes.push(object);
            break;
        case 'ObjectPattern':
            for (const prop of param.properties) {
                if (prop.type === 'RestElement') {
                    extractIdentifiers(prop.argument, nodes);
                }
                else {
                    extractIdentifiers(prop.value, nodes);
                }
            }
            break;
        case 'ArrayPattern':
            param.elements.forEach(element => {
                if (element)
                    extractIdentifiers(element, nodes);
            });
            break;
        case 'RestElement':
            extractIdentifiers(param.argument, nodes);
            break;
        case 'AssignmentPattern':
            extractIdentifiers(param.left, nodes);
            break;
    }
    return nodes;
}
const isFunctionType = (node) => {
    return /Function(?:Expression|Declaration)$|Method$/.test(node.type);
};
const isStaticProperty = (node) => node &&
    (node.type === 'ObjectProperty' || node.type === 'ObjectMethod') &&
    !node.computed;
const isStaticPropertyKey = (node, parent) => isStaticProperty(parent) && parent.key === node;

// these keywords should not appear inside expressions, but operators like
// typeof, instanceof and in are allowed
const prohibitedKeywordRE = new RegExp('\\b' +
    ('do,if,for,let,new,try,var,case,else,with,await,break,catch,class,const,' +
        'super,throw,while,yield,delete,export,import,return,switch,default,' +
        'extends,finally,continue,debugger,function,arguments,typeof,void')
        .split(',')
        .join('\\b|\\b') +
    '\\b');
// strip strings in expressions
const stripStringRE = /'(?:[^'\\]|\\.)*'|"(?:[^"\\]|\\.)*"|`(?:[^`\\]|\\.)*\$\{|\}(?:[^`\\]|\\.)*`|`(?:[^`\\]|\\.)*`/g;
/**
 * Validate a non-prefixed expression.
 * This is only called when using the in-browser runtime compiler since it
 * doesn't prefix expressions.
 */
function validateBrowserExpression(node, context, asParams = false, asRawStatements = false) {
    const exp = node.content;
    // empty expressions are validated per-directive since some directives
    // do allow empty expressions.
    if (!exp.trim()) {
        return;
    }
    try {
        new Function(asRawStatements
            ? ` ${exp} `
            : `return ${asParams ? `(${exp}) => {}` : `(${exp})`}`);
    }
    catch (e) {
        let message = e.message;
        const keywordMatch = exp
            .replace(stripStringRE, '')
            .match(prohibitedKeywordRE);
        if (keywordMatch) {
            message = `avoid using JavaScript keyword as property name: "${keywordMatch[0]}"`;
        }
        context.onError(createCompilerError(44 /* X_INVALID_EXPRESSION */, node.loc, undefined, message));
    }
}

const transformExpression = (node, context) => {
    if (node.type === 5 /* INTERPOLATION */) {
        node.content = processExpression(node.content, context);
    }
    else if (node.type === 1 /* ELEMENT */) {
        // handle directives on element
        for (let i = 0; i < node.props.length; i++) {
            const dir = node.props[i];
            // do not process for v-on & v-for since they are special handled
            if (dir.type === 7 /* DIRECTIVE */ && dir.name !== 'for') {
                const exp = dir.exp;
                const arg = dir.arg;
                // do not process exp if this is v-on:arg - we need special handling
                // for wrapping inline statements.
                if (exp &&
                    exp.type === 4 /* SIMPLE_EXPRESSION */ &&
                    !(dir.name === 'on' && arg)) {
                    dir.exp = processExpression(exp, context, 
                    // slot args must be processed as function params
                    dir.name === 'slot');
                }
                if (arg && arg.type === 4 /* SIMPLE_EXPRESSION */ && !arg.isStatic) {
                    dir.arg = processExpression(arg, context);
                }
            }
        }
    }
};
// Important: since this function uses Node.js only dependencies, it should
// always be used with a leading !true check so that it can be
// tree-shaken from the browser build.
function processExpression(node, context, 
// some expressions like v-slot props & v-for aliases should be parsed as
// function params
asParams = false, 
// v-on handler values may contain multiple statements
asRawStatements = false) {
    {
        {
            // simple in-browser validation (same logic in 2.x)
            validateBrowserExpression(node, context, asParams, asRawStatements);
        }
        return node;
    }
}

const transformIf = createStructuralDirectiveTransform(/^(if|else|else-if)$/, (node, dir, context) => {
    return processIf(node, dir, context, (ifNode, branch, isRoot) => {
        // #1587: We need to dynamically increment the key based on the current
        // node's sibling nodes, since chained v-if/else branches are
        // rendered at the same depth
        const siblings = context.parent.children;
        let i = siblings.indexOf(ifNode);
        let key = 0;
        while (i-- >= 0) {
            const sibling = siblings[i];
            if (sibling && sibling.type === 9 /* IF */) {
                key += sibling.branches.length;
            }
        }
        // Exit callback. Complete the codegenNode when all children have been
        // transformed.
        return () => {
            if (isRoot) {
                ifNode.codegenNode = createCodegenNodeForBranch(branch, key, context);
            }
            else {
                // attach this branch's codegen node to the v-if root.
                const parentCondition = getParentCondition(ifNode.codegenNode);
                parentCondition.alternate = createCodegenNodeForBranch(branch, key + ifNode.branches.length - 1, context);
            }
        };
    });
});
// target-agnostic transform used for both Client and SSR
function processIf(node, dir, context, processCodegen) {
    if (dir.name !== 'else' &&
        (!dir.exp || !dir.exp.content.trim())) {
        const loc = dir.exp ? dir.exp.loc : node.loc;
        context.onError(createCompilerError(28 /* X_V_IF_NO_EXPRESSION */, dir.loc));
        dir.exp = createSimpleExpression(`true`, false, loc);
    }
    if (dir.exp) {
        validateBrowserExpression(dir.exp, context);
    }
    if (dir.name === 'if') {
        const branch = createIfBranch(node, dir);
        const ifNode = {
            type: 9 /* IF */,
            loc: node.loc,
            branches: [branch]
        };
        context.replaceNode(ifNode);
        if (processCodegen) {
            return processCodegen(ifNode, branch, true);
        }
    }
    else {
        // locate the adjacent v-if
        const siblings = context.parent.children;
        const comments = [];
        let i = siblings.indexOf(node);
        while (i-- >= -1) {
            const sibling = siblings[i];
            if (sibling && sibling.type === 3 /* COMMENT */) {
                context.removeNode(sibling);
                comments.unshift(sibling);
                continue;
            }
            if (sibling &&
                sibling.type === 2 /* TEXT */ &&
                !sibling.content.trim().length) {
                context.removeNode(sibling);
                continue;
            }
            if (sibling && sibling.type === 9 /* IF */) {
                // move the node to the if node's branches
                context.removeNode();
                const branch = createIfBranch(node, dir);
                if (comments.length &&
                    // #3619 ignore comments if the v-if is direct child of <transition>
                    !(context.parent &&
                        context.parent.type === 1 /* ELEMENT */ &&
                        isBuiltInType(context.parent.tag, 'transition'))) {
                    branch.children = [...comments, ...branch.children];
                }
                // check if user is forcing same key on different branches
                {
                    const key = branch.userKey;
                    if (key) {
                        sibling.branches.forEach(({ userKey }) => {
                            if (isSameKey(userKey, key)) {
                                context.onError(createCompilerError(29 /* X_V_IF_SAME_KEY */, branch.userKey.loc));
                            }
                        });
                    }
                }
                sibling.branches.push(branch);
                const onExit = processCodegen && processCodegen(sibling, branch, false);
                // since the branch was removed, it will not be traversed.
                // make sure to traverse here.
                traverseNode(branch, context);
                // call on exit
                if (onExit)
                    onExit();
                // make sure to reset currentNode after traversal to indicate this
                // node has been removed.
                context.currentNode = null;
            }
            else {
                context.onError(createCompilerError(30 /* X_V_ELSE_NO_ADJACENT_IF */, node.loc));
            }
            break;
        }
    }
}
function createIfBranch(node, dir) {
    return {
        type: 10 /* IF_BRANCH */,
        loc: node.loc,
        condition: dir.name === 'else' ? undefined : dir.exp,
        children: node.tagType === 3 /* TEMPLATE */ && !findDir(node, 'for')
            ? node.children
            : [node],
        userKey: findProp(node, `key`)
    };
}
function createCodegenNodeForBranch(branch, keyIndex, context) {
    if (branch.condition) {
        return createConditionalExpression(branch.condition, createChildrenCodegenNode(branch, keyIndex, context), 
        // make sure to pass in asBlock: true so that the comment node call
        // closes the current block.
        createCallExpression(context.helper(CREATE_COMMENT), [
            '"v-if"' ,
            'true'
        ]));
    }
    else {
        return createChildrenCodegenNode(branch, keyIndex, context);
    }
}
function createChildrenCodegenNode(branch, keyIndex, context) {
    const { helper } = context;
    const keyProperty = createObjectProperty(`key`, createSimpleExpression(`${keyIndex}`, false, locStub, 2 /* CAN_HOIST */));
    const { children } = branch;
    const firstChild = children[0];
    const needFragmentWrapper = children.length !== 1 || firstChild.type !== 1 /* ELEMENT */;
    if (needFragmentWrapper) {
        if (children.length === 1 && firstChild.type === 11 /* FOR */) {
            // optimize away nested fragments when child is a ForNode
            const vnodeCall = firstChild.codegenNode;
            injectProp(vnodeCall, keyProperty, context);
            return vnodeCall;
        }
        else {
            let patchFlag = 64 /* STABLE_FRAGMENT */;
            let patchFlagText = PatchFlagNames[64 /* STABLE_FRAGMENT */];
            // check if the fragment actually contains a single valid child with
            // the rest being comments
            if (children.filter(c => c.type !== 3 /* COMMENT */).length === 1) {
                patchFlag |= 2048 /* DEV_ROOT_FRAGMENT */;
                patchFlagText += `, ${PatchFlagNames[2048 /* DEV_ROOT_FRAGMENT */]}`;
            }
            return createVNodeCall(context, helper(FRAGMENT), createObjectExpression([keyProperty]), children, patchFlag + (` /* ${patchFlagText} */` ), undefined, undefined, true, false, false /* isComponent */, branch.loc);
        }
    }
    else {
        const ret = firstChild.codegenNode;
        const vnodeCall = getMemoedVNodeCall(ret);
        // Change createVNode to createBlock.
        if (vnodeCall.type === 13 /* VNODE_CALL */) {
            makeBlock(vnodeCall, context);
        }
        // inject branch key
        injectProp(vnodeCall, keyProperty, context);
        return ret;
    }
}
function isSameKey(a, b) {
    if (!a || a.type !== b.type) {
        return false;
    }
    if (a.type === 6 /* ATTRIBUTE */) {
        if (a.value.content !== b.value.content) {
            return false;
        }
    }
    else {
        // directive
        const exp = a.exp;
        const branchExp = b.exp;
        if (exp.type !== branchExp.type) {
            return false;
        }
        if (exp.type !== 4 /* SIMPLE_EXPRESSION */ ||
            exp.isStatic !== branchExp.isStatic ||
            exp.content !== branchExp.content) {
            return false;
        }
    }
    return true;
}
function getParentCondition(node) {
    while (true) {
        if (node.type === 19 /* JS_CONDITIONAL_EXPRESSION */) {
            if (node.alternate.type === 19 /* JS_CONDITIONAL_EXPRESSION */) {
                node = node.alternate;
            }
            else {
                return node;
            }
        }
        else if (node.type === 20 /* JS_CACHE_EXPRESSION */) {
            node = node.value;
        }
    }
}

const transformFor = createStructuralDirectiveTransform('for', (node, dir, context) => {
    const { helper, removeHelper } = context;
    return processFor(node, dir, context, forNode => {
        // create the loop render function expression now, and add the
        // iterator on exit after all children have been traversed
        const renderExp = createCallExpression(helper(RENDER_LIST), [
            forNode.source
        ]);
        const memo = findDir(node, 'memo');
        const keyProp = findProp(node, `key`);
        const keyExp = keyProp &&
            (keyProp.type === 6 /* ATTRIBUTE */
                ? createSimpleExpression(keyProp.value.content, true)
                : keyProp.exp);
        const keyProperty = keyProp ? createObjectProperty(`key`, keyExp) : null;
        const isStableFragment = forNode.source.type === 4 /* SIMPLE_EXPRESSION */ &&
            forNode.source.constType > 0 /* NOT_CONSTANT */;
        const fragmentFlag = isStableFragment
            ? 64 /* STABLE_FRAGMENT */
            : keyProp
                ? 128 /* KEYED_FRAGMENT */
                : 256 /* UNKEYED_FRAGMENT */;
        forNode.codegenNode = createVNodeCall(context, helper(FRAGMENT), undefined, renderExp, fragmentFlag +
            (` /* ${PatchFlagNames[fragmentFlag]} */` ), undefined, undefined, true /* isBlock */, !isStableFragment /* disableTracking */, false /* isComponent */, node.loc);
        return () => {
            // finish the codegen now that all children have been traversed
            let childBlock;
            const isTemplate = isTemplateNode(node);
            const { children } = forNode;
            // check <template v-for> key placement
            if (isTemplate) {
                node.children.some(c => {
                    if (c.type === 1 /* ELEMENT */) {
                        const key = findProp(c, 'key');
                        if (key) {
                            context.onError(createCompilerError(33 /* X_V_FOR_TEMPLATE_KEY_PLACEMENT */, key.loc));
                            return true;
                        }
                    }
                });
            }
            const needFragmentWrapper = children.length !== 1 || children[0].type !== 1 /* ELEMENT */;
            const slotOutlet = isSlotOutlet(node)
                ? node
                : isTemplate &&
                    node.children.length === 1 &&
                    isSlotOutlet(node.children[0])
                    ? node.children[0] // api-extractor somehow fails to infer this
                    : null;
            if (slotOutlet) {
                // <slot v-for="..."> or <template v-for="..."><slot/></template>
                childBlock = slotOutlet.codegenNode;
                if (isTemplate && keyProperty) {
                    // <template v-for="..." :key="..."><slot/></template>
                    // we need to inject the key to the renderSlot() call.
                    // the props for renderSlot is passed as the 3rd argument.
                    injectProp(childBlock, keyProperty, context);
                }
            }
            else if (needFragmentWrapper) {
                // <template v-for="..."> with text or multi-elements
                // should generate a fragment block for each loop
                childBlock = createVNodeCall(context, helper(FRAGMENT), keyProperty ? createObjectExpression([keyProperty]) : undefined, node.children, 64 /* STABLE_FRAGMENT */ +
                    (` /* ${PatchFlagNames[64 /* STABLE_FRAGMENT */]} */`
                        ), undefined, undefined, true, undefined, false /* isComponent */);
            }
            else {
                // Normal element v-for. Directly use the child's codegenNode
                // but mark it as a block.
                childBlock = children[0]
                    .codegenNode;
                if (isTemplate && keyProperty) {
                    injectProp(childBlock, keyProperty, context);
                }
                if (childBlock.isBlock !== !isStableFragment) {
                    if (childBlock.isBlock) {
                        // switch from block to vnode
                        removeHelper(OPEN_BLOCK);
                        removeHelper(getVNodeBlockHelper(context.inSSR, childBlock.isComponent));
                    }
                    else {
                        // switch from vnode to block
                        removeHelper(getVNodeHelper(context.inSSR, childBlock.isComponent));
                    }
                }
                childBlock.isBlock = !isStableFragment;
                if (childBlock.isBlock) {
                    helper(OPEN_BLOCK);
                    helper(getVNodeBlockHelper(context.inSSR, childBlock.isComponent));
                }
                else {
                    helper(getVNodeHelper(context.inSSR, childBlock.isComponent));
                }
            }
            if (memo) {
                const loop = createFunctionExpression(createForLoopParams(forNode.parseResult, [
                    createSimpleExpression(`_cached`)
                ]));
                loop.body = createBlockStatement([
                    createCompoundExpression([`const _memo = (`, memo.exp, `)`]),
                    createCompoundExpression([
                        `if (_cached`,
                        ...(keyExp ? [` && _cached.key === `, keyExp] : []),
                        ` && ${context.helperString(IS_MEMO_SAME)}(_cached, _memo)) return _cached`
                    ]),
                    createCompoundExpression([`const _item = `, childBlock]),
                    createSimpleExpression(`_item.memo = _memo`),
                    createSimpleExpression(`return _item`)
                ]);
                renderExp.arguments.push(loop, createSimpleExpression(`_cache`), createSimpleExpression(String(context.cached++)));
            }
            else {
                renderExp.arguments.push(createFunctionExpression(createForLoopParams(forNode.parseResult), childBlock, true /* force newline */));
            }
        };
    });
});
// target-agnostic transform used for both Client and SSR
function processFor(node, dir, context, processCodegen) {
    if (!dir.exp) {
        context.onError(createCompilerError(31 /* X_V_FOR_NO_EXPRESSION */, dir.loc));
        return;
    }
    const parseResult = parseForExpression(
    // can only be simple expression because vFor transform is applied
    // before expression transform.
    dir.exp, context);
    if (!parseResult) {
        context.onError(createCompilerError(32 /* X_V_FOR_MALFORMED_EXPRESSION */, dir.loc));
        return;
    }
    const { addIdentifiers, removeIdentifiers, scopes } = context;
    const { source, value, key, index } = parseResult;
    const forNode = {
        type: 11 /* FOR */,
        loc: dir.loc,
        source,
        valueAlias: value,
        keyAlias: key,
        objectIndexAlias: index,
        parseResult,
        children: isTemplateNode(node) ? node.children : [node]
    };
    context.replaceNode(forNode);
    // bookkeeping
    scopes.vFor++;
    const onExit = processCodegen && processCodegen(forNode);
    return () => {
        scopes.vFor--;
        if (onExit)
            onExit();
    };
}
const forAliasRE = /([\s\S]*?)\s+(?:in|of)\s+([\s\S]*)/;
// This regex doesn't cover the case if key or index aliases have destructuring,
// but those do not make sense in the first place, so this works in practice.
const forIteratorRE = /,([^,\}\]]*)(?:,([^,\}\]]*))?$/;
const stripParensRE = /^\(|\)$/g;
function parseForExpression(input, context) {
    const loc = input.loc;
    const exp = input.content;
    const inMatch = exp.match(forAliasRE);
    if (!inMatch)
        return;
    const [, LHS, RHS] = inMatch;
    const result = {
        source: createAliasExpression(loc, RHS.trim(), exp.indexOf(RHS, LHS.length)),
        value: undefined,
        key: undefined,
        index: undefined
    };
    {
        validateBrowserExpression(result.source, context);
    }
    let valueContent = LHS.trim().replace(stripParensRE, '').trim();
    const trimmedOffset = LHS.indexOf(valueContent);
    const iteratorMatch = valueContent.match(forIteratorRE);
    if (iteratorMatch) {
        valueContent = valueContent.replace(forIteratorRE, '').trim();
        const keyContent = iteratorMatch[1].trim();
        let keyOffset;
        if (keyContent) {
            keyOffset = exp.indexOf(keyContent, trimmedOffset + valueContent.length);
            result.key = createAliasExpression(loc, keyContent, keyOffset);
            {
                validateBrowserExpression(result.key, context, true);
            }
        }
        if (iteratorMatch[2]) {
            const indexContent = iteratorMatch[2].trim();
            if (indexContent) {
                result.index = createAliasExpression(loc, indexContent, exp.indexOf(indexContent, result.key
                    ? keyOffset + keyContent.length
                    : trimmedOffset + valueContent.length));
                {
                    validateBrowserExpression(result.index, context, true);
                }
            }
        }
    }
    if (valueContent) {
        result.value = createAliasExpression(loc, valueContent, trimmedOffset);
        {
            validateBrowserExpression(result.value, context, true);
        }
    }
    return result;
}
function createAliasExpression(range, content, offset) {
    return createSimpleExpression(content, false, getInnerRange(range, offset, content.length));
}
function createForLoopParams({ value, key, index }, memoArgs = []) {
    return createParamsList([value, key, index, ...memoArgs]);
}
function createParamsList(args) {
    let i = args.length;
    while (i--) {
        if (args[i])
            break;
    }
    return args
        .slice(0, i + 1)
        .map((arg, i) => arg || createSimpleExpression(`_`.repeat(i + 1), false));
}

const defaultFallback = createSimpleExpression(`undefined`, false);
// A NodeTransform that:
// 1. Tracks scope identifiers for scoped slots so that they don't get prefixed
//    by transformExpression. This is only applied in non-browser builds with
//    { prefixIdentifiers: true }.
// 2. Track v-slot depths so that we know a slot is inside another slot.
//    Note the exit callback is executed before buildSlots() on the same node,
//    so only nested slots see positive numbers.
const trackSlotScopes = (node, context) => {
    if (node.type === 1 /* ELEMENT */ &&
        (node.tagType === 1 /* COMPONENT */ ||
            node.tagType === 3 /* TEMPLATE */)) {
        // We are only checking non-empty v-slot here
        // since we only care about slots that introduce scope variables.
        const vSlot = findDir(node, 'slot');
        if (vSlot) {
            vSlot.exp;
            context.scopes.vSlot++;
            return () => {
                context.scopes.vSlot--;
            };
        }
    }
};
// A NodeTransform that tracks scope identifiers for scoped slots with v-for.
// This transform is only applied in non-browser builds with { prefixIdentifiers: true }
const trackVForSlotScopes = (node, context) => {
    let vFor;
    if (isTemplateNode(node) &&
        node.props.some(isVSlot) &&
        (vFor = findDir(node, 'for'))) {
        const result = (vFor.parseResult = parseForExpression(vFor.exp, context));
        if (result) {
            const { value, key, index } = result;
            const { addIdentifiers, removeIdentifiers } = context;
            value && addIdentifiers(value);
            key && addIdentifiers(key);
            index && addIdentifiers(index);
            return () => {
                value && removeIdentifiers(value);
                key && removeIdentifiers(key);
                index && removeIdentifiers(index);
            };
        }
    }
};
const buildClientSlotFn = (props, children, loc) => createFunctionExpression(props, children, false /* newline */, true /* isSlot */, children.length ? children[0].loc : loc);
// Instead of being a DirectiveTransform, v-slot processing is called during
// transformElement to build the slots object for a component.
function buildSlots(node, context, buildSlotFn = buildClientSlotFn) {
    context.helper(WITH_CTX);
    const { children, loc } = node;
    const slotsProperties = [];
    const dynamicSlots = [];
    // If the slot is inside a v-for or another v-slot, force it to be dynamic
    // since it likely uses a scope variable.
    let hasDynamicSlots = context.scopes.vSlot > 0 || context.scopes.vFor > 0;
    // 1. Check for slot with slotProps on component itself.
    //    <Comp v-slot="{ prop }"/>
    const onComponentSlot = findDir(node, 'slot', true);
    if (onComponentSlot) {
        const { arg, exp } = onComponentSlot;
        if (arg && !isStaticExp(arg)) {
            hasDynamicSlots = true;
        }
        slotsProperties.push(createObjectProperty(arg || createSimpleExpression('default', true), buildSlotFn(exp, children, loc)));
    }
    // 2. Iterate through children and check for template slots
    //    <template v-slot:foo="{ prop }">
    let hasTemplateSlots = false;
    let hasNamedDefaultSlot = false;
    const implicitDefaultChildren = [];
    const seenSlotNames = new Set();
    for (let i = 0; i < children.length; i++) {
        const slotElement = children[i];
        let slotDir;
        if (!isTemplateNode(slotElement) ||
            !(slotDir = findDir(slotElement, 'slot', true))) {
            // not a <template v-slot>, skip.
            if (slotElement.type !== 3 /* COMMENT */) {
                implicitDefaultChildren.push(slotElement);
            }
            continue;
        }
        if (onComponentSlot) {
            // already has on-component slot - this is incorrect usage.
            context.onError(createCompilerError(37 /* X_V_SLOT_MIXED_SLOT_USAGE */, slotDir.loc));
            break;
        }
        hasTemplateSlots = true;
        const { children: slotChildren, loc: slotLoc } = slotElement;
        const { arg: slotName = createSimpleExpression(`default`, true), exp: slotProps, loc: dirLoc } = slotDir;
        // check if name is dynamic.
        let staticSlotName;
        if (isStaticExp(slotName)) {
            staticSlotName = slotName ? slotName.content : `default`;
        }
        else {
            hasDynamicSlots = true;
        }
        const slotFunction = buildSlotFn(slotProps, slotChildren, slotLoc);
        // check if this slot is conditional (v-if/v-for)
        let vIf;
        let vElse;
        let vFor;
        if ((vIf = findDir(slotElement, 'if'))) {
            hasDynamicSlots = true;
            dynamicSlots.push(createConditionalExpression(vIf.exp, buildDynamicSlot(slotName, slotFunction), defaultFallback));
        }
        else if ((vElse = findDir(slotElement, /^else(-if)?$/, true /* allowEmpty */))) {
            // find adjacent v-if
            let j = i;
            let prev;
            while (j--) {
                prev = children[j];
                if (prev.type !== 3 /* COMMENT */) {
                    break;
                }
            }
            if (prev && isTemplateNode(prev) && findDir(prev, 'if')) {
                // remove node
                children.splice(i, 1);
                i--;
                // attach this slot to previous conditional
                let conditional = dynamicSlots[dynamicSlots.length - 1];
                while (conditional.alternate.type === 19 /* JS_CONDITIONAL_EXPRESSION */) {
                    conditional = conditional.alternate;
                }
                conditional.alternate = vElse.exp
                    ? createConditionalExpression(vElse.exp, buildDynamicSlot(slotName, slotFunction), defaultFallback)
                    : buildDynamicSlot(slotName, slotFunction);
            }
            else {
                context.onError(createCompilerError(30 /* X_V_ELSE_NO_ADJACENT_IF */, vElse.loc));
            }
        }
        else if ((vFor = findDir(slotElement, 'for'))) {
            hasDynamicSlots = true;
            const parseResult = vFor.parseResult ||
                parseForExpression(vFor.exp, context);
            if (parseResult) {
                // Render the dynamic slots as an array and add it to the createSlot()
                // args. The runtime knows how to handle it appropriately.
                dynamicSlots.push(createCallExpression(context.helper(RENDER_LIST), [
                    parseResult.source,
                    createFunctionExpression(createForLoopParams(parseResult), buildDynamicSlot(slotName, slotFunction), true /* force newline */)
                ]));
            }
            else {
                context.onError(createCompilerError(32 /* X_V_FOR_MALFORMED_EXPRESSION */, vFor.loc));
            }
        }
        else {
            // check duplicate static names
            if (staticSlotName) {
                if (seenSlotNames.has(staticSlotName)) {
                    context.onError(createCompilerError(38 /* X_V_SLOT_DUPLICATE_SLOT_NAMES */, dirLoc));
                    continue;
                }
                seenSlotNames.add(staticSlotName);
                if (staticSlotName === 'default') {
                    hasNamedDefaultSlot = true;
                }
            }
            slotsProperties.push(createObjectProperty(slotName, slotFunction));
        }
    }
    if (!onComponentSlot) {
        const buildDefaultSlotProperty = (props, children) => {
            const fn = buildSlotFn(props, children, loc);
            if (context.compatConfig) {
                fn.isNonScopedSlot = true;
            }
            return createObjectProperty(`default`, fn);
        };
        if (!hasTemplateSlots) {
            // implicit default slot (on component)
            slotsProperties.push(buildDefaultSlotProperty(undefined, children));
        }
        else if (implicitDefaultChildren.length &&
            // #3766
            // with whitespace: 'preserve', whitespaces between slots will end up in
            // implicitDefaultChildren. Ignore if all implicit children are whitespaces.
            implicitDefaultChildren.some(node => isNonWhitespaceContent(node))) {
            // implicit default slot (mixed with named slots)
            if (hasNamedDefaultSlot) {
                context.onError(createCompilerError(39 /* X_V_SLOT_EXTRANEOUS_DEFAULT_SLOT_CHILDREN */, implicitDefaultChildren[0].loc));
            }
            else {
                slotsProperties.push(buildDefaultSlotProperty(undefined, implicitDefaultChildren));
            }
        }
    }
    const slotFlag = hasDynamicSlots
        ? 2 /* DYNAMIC */
        : hasForwardedSlots(node.children)
            ? 3 /* FORWARDED */
            : 1 /* STABLE */;
    let slots = createObjectExpression(slotsProperties.concat(createObjectProperty(`_`, 
    // 2 = compiled but dynamic = can skip normalization, but must run diff
    // 1 = compiled and static = can skip normalization AND diff as optimized
    createSimpleExpression(slotFlag + (` /* ${slotFlagsText[slotFlag]} */` ), false))), loc);
    if (dynamicSlots.length) {
        slots = createCallExpression(context.helper(CREATE_SLOTS), [
            slots,
            createArrayExpression(dynamicSlots)
        ]);
    }
    return {
        slots,
        hasDynamicSlots
    };
}
function buildDynamicSlot(name, fn) {
    return createObjectExpression([
        createObjectProperty(`name`, name),
        createObjectProperty(`fn`, fn)
    ]);
}
function hasForwardedSlots(children) {
    for (let i = 0; i < children.length; i++) {
        const child = children[i];
        switch (child.type) {
            case 1 /* ELEMENT */:
                if (child.tagType === 2 /* SLOT */ ||
                    hasForwardedSlots(child.children)) {
                    return true;
                }
                break;
            case 9 /* IF */:
                if (hasForwardedSlots(child.branches))
                    return true;
                break;
            case 10 /* IF_BRANCH */:
            case 11 /* FOR */:
                if (hasForwardedSlots(child.children))
                    return true;
                break;
        }
    }
    return false;
}
function isNonWhitespaceContent(node) {
    if (node.type !== 2 /* TEXT */ && node.type !== 12 /* TEXT_CALL */)
        return true;
    return node.type === 2 /* TEXT */
        ? !!node.content.trim()
        : isNonWhitespaceContent(node.content);
}

// some directive transforms (e.g. v-model) may return a symbol for runtime
// import, which should be used instead of a resolveDirective call.
const directiveImportMap = new WeakMap();
// generate a JavaScript AST for this element's codegen
const transformElement = (node, context) => {
    // perform the work on exit, after all child expressions have been
    // processed and merged.
    return function postTransformElement() {
        node = context.currentNode;
        if (!(node.type === 1 /* ELEMENT */ &&
            (node.tagType === 0 /* ELEMENT */ ||
                node.tagType === 1 /* COMPONENT */))) {
            return;
        }
        const { tag, props } = node;
        const isComponent = node.tagType === 1 /* COMPONENT */;
        // The goal of the transform is to create a codegenNode implementing the
        // VNodeCall interface.
        let vnodeTag = isComponent
            ? resolveComponentType(node, context)
            : `"${tag}"`;
        const isDynamicComponent = isObject(vnodeTag) && vnodeTag.callee === RESOLVE_DYNAMIC_COMPONENT;
        let vnodeProps;
        let vnodeChildren;
        let vnodePatchFlag;
        let patchFlag = 0;
        let vnodeDynamicProps;
        let dynamicPropNames;
        let vnodeDirectives;
        let shouldUseBlock = 
        // dynamic component may resolve to plain elements
        isDynamicComponent ||
            vnodeTag === TELEPORT ||
            vnodeTag === SUSPENSE ||
            (!isComponent &&
                // <svg> and <foreignObject> must be forced into blocks so that block
                // updates inside get proper isSVG flag at runtime. (#639, #643)
                // This is technically web-specific, but splitting the logic out of core
                // leads to too much unnecessary complexity.
                (tag === 'svg' ||
                    tag === 'foreignObject' ||
                    // #938: elements with dynamic keys should be forced into blocks
                    findProp(node, 'key', true)));
        // props
        if (props.length > 0) {
            const propsBuildResult = buildProps(node, context);
            vnodeProps = propsBuildResult.props;
            patchFlag = propsBuildResult.patchFlag;
            dynamicPropNames = propsBuildResult.dynamicPropNames;
            const directives = propsBuildResult.directives;
            vnodeDirectives =
                directives && directives.length
                    ? createArrayExpression(directives.map(dir => buildDirectiveArgs(dir, context)))
                    : undefined;
        }
        // children
        if (node.children.length > 0) {
            if (vnodeTag === KEEP_ALIVE) {
                // Although a built-in component, we compile KeepAlive with raw children
                // instead of slot functions so that it can be used inside Transition
                // or other Transition-wrapping HOCs.
                // To ensure correct updates with block optimizations, we need to:
                // 1. Force keep-alive into a block. This avoids its children being
                //    collected by a parent block.
                shouldUseBlock = true;
                // 2. Force keep-alive to always be updated, since it uses raw children.
                patchFlag |= 1024 /* DYNAMIC_SLOTS */;
                if (node.children.length > 1) {
                    context.onError(createCompilerError(45 /* X_KEEP_ALIVE_INVALID_CHILDREN */, {
                        start: node.children[0].loc.start,
                        end: node.children[node.children.length - 1].loc.end,
                        source: ''
                    }));
                }
            }
            const shouldBuildAsSlots = isComponent &&
                // Teleport is not a real component and has dedicated runtime handling
                vnodeTag !== TELEPORT &&
                // explained above.
                vnodeTag !== KEEP_ALIVE;
            if (shouldBuildAsSlots) {
                const { slots, hasDynamicSlots } = buildSlots(node, context);
                vnodeChildren = slots;
                if (hasDynamicSlots) {
                    patchFlag |= 1024 /* DYNAMIC_SLOTS */;
                }
            }
            else if (node.children.length === 1 && vnodeTag !== TELEPORT) {
                const child = node.children[0];
                const type = child.type;
                // check for dynamic text children
                const hasDynamicTextChild = type === 5 /* INTERPOLATION */ ||
                    type === 8 /* COMPOUND_EXPRESSION */;
                if (hasDynamicTextChild &&
                    getConstantType(child, context) === 0 /* NOT_CONSTANT */) {
                    patchFlag |= 1 /* TEXT */;
                }
                // pass directly if the only child is a text node
                // (plain / interpolation / expression)
                if (hasDynamicTextChild || type === 2 /* TEXT */) {
                    vnodeChildren = child;
                }
                else {
                    vnodeChildren = node.children;
                }
            }
            else {
                vnodeChildren = node.children;
            }
        }
        // patchFlag & dynamicPropNames
        if (patchFlag !== 0) {
            {
                if (patchFlag < 0) {
                    // special flags (negative and mutually exclusive)
                    vnodePatchFlag = patchFlag + ` /* ${PatchFlagNames[patchFlag]} */`;
                }
                else {
                    // bitwise flags
                    const flagNames = Object.keys(PatchFlagNames)
                        .map(Number)
                        .filter(n => n > 0 && patchFlag & n)
                        .map(n => PatchFlagNames[n])
                        .join(`, `);
                    vnodePatchFlag = patchFlag + ` /* ${flagNames} */`;
                }
            }
            if (dynamicPropNames && dynamicPropNames.length) {
                vnodeDynamicProps = stringifyDynamicPropNames(dynamicPropNames);
            }
        }
        node.codegenNode = createVNodeCall(context, vnodeTag, vnodeProps, vnodeChildren, vnodePatchFlag, vnodeDynamicProps, vnodeDirectives, !!shouldUseBlock, false /* disableTracking */, isComponent, node.loc);
    };
};
function resolveComponentType(node, context, ssr = false) {
    let { tag } = node;
    // 1. dynamic component
    const isExplicitDynamic = isComponentTag(tag);
    const isProp = findProp(node, 'is');
    if (isProp) {
        if (isExplicitDynamic ||
            (isCompatEnabled("COMPILER_IS_ON_ELEMENT" /* COMPILER_IS_ON_ELEMENT */, context))) {
            const exp = isProp.type === 6 /* ATTRIBUTE */
                ? isProp.value && createSimpleExpression(isProp.value.content, true)
                : isProp.exp;
            if (exp) {
                return createCallExpression(context.helper(RESOLVE_DYNAMIC_COMPONENT), [
                    exp
                ]);
            }
        }
        else if (isProp.type === 6 /* ATTRIBUTE */ &&
            isProp.value.content.startsWith('vue:')) {
            // <button is="vue:xxx">
            // if not <component>, only is value that starts with "vue:" will be
            // treated as component by the parse phase and reach here, unless it's
            // compat mode where all is values are considered components
            tag = isProp.value.content.slice(4);
        }
    }
    // 1.5 v-is (TODO: Deprecate)
    const isDir = !isExplicitDynamic && findDir(node, 'is');
    if (isDir && isDir.exp) {
        return createCallExpression(context.helper(RESOLVE_DYNAMIC_COMPONENT), [
            isDir.exp
        ]);
    }
    // 2. built-in components (Teleport, Transition, KeepAlive, Suspense...)
    const builtIn = isCoreComponent(tag) || context.isBuiltInComponent(tag);
    if (builtIn) {
        // built-ins are simply fallthroughs / have special handling during ssr
        // so we don't need to import their runtime equivalents
        if (!ssr)
            context.helper(builtIn);
        return builtIn;
    }
    // 5. user component (resolve)
    context.helper(RESOLVE_COMPONENT);
    context.components.add(tag);
    return toValidAssetId(tag, `component`);
}
function buildProps(node, context, props = node.props, ssr = false) {
    const { tag, loc: elementLoc } = node;
    const isComponent = node.tagType === 1 /* COMPONENT */;
    let properties = [];
    const mergeArgs = [];
    const runtimeDirectives = [];
    // patchFlag analysis
    let patchFlag = 0;
    let hasRef = false;
    let hasClassBinding = false;
    let hasStyleBinding = false;
    let hasHydrationEventBinding = false;
    let hasDynamicKeys = false;
    let hasVnodeHook = false;
    const dynamicPropNames = [];
    const analyzePatchFlag = ({ key, value }) => {
        if (isStaticExp(key)) {
            const name = key.content;
            const isEventHandler = isOn(name);
            if (!isComponent &&
                isEventHandler &&
                // omit the flag for click handlers because hydration gives click
                // dedicated fast path.
                name.toLowerCase() !== 'onclick' &&
                // omit v-model handlers
                name !== 'onUpdate:modelValue' &&
                // omit onVnodeXXX hooks
                !isReservedProp(name)) {
                hasHydrationEventBinding = true;
            }
            if (isEventHandler && isReservedProp(name)) {
                hasVnodeHook = true;
            }
            if (value.type === 20 /* JS_CACHE_EXPRESSION */ ||
                ((value.type === 4 /* SIMPLE_EXPRESSION */ ||
                    value.type === 8 /* COMPOUND_EXPRESSION */) &&
                    getConstantType(value, context) > 0)) {
                // skip if the prop is a cached handler or has constant value
                return;
            }
            if (name === 'ref') {
                hasRef = true;
            }
            else if (name === 'class') {
                hasClassBinding = true;
            }
            else if (name === 'style') {
                hasStyleBinding = true;
            }
            else if (name !== 'key' && !dynamicPropNames.includes(name)) {
                dynamicPropNames.push(name);
            }
            // treat the dynamic class and style binding of the component as dynamic props
            if (isComponent &&
                (name === 'class' || name === 'style') &&
                !dynamicPropNames.includes(name)) {
                dynamicPropNames.push(name);
            }
        }
        else {
            hasDynamicKeys = true;
        }
    };
    for (let i = 0; i < props.length; i++) {
        // static attribute
        const prop = props[i];
        if (prop.type === 6 /* ATTRIBUTE */) {
            const { loc, name, value } = prop;
            let valueNode = createSimpleExpression(value ? value.content : '', true, value ? value.loc : loc);
            if (name === 'ref') {
                hasRef = true;
            }
            // skip is on <component>, or is="vue:xxx"
            if (name === 'is' &&
                (isComponentTag(tag) ||
                    (value && value.content.startsWith('vue:')) ||
                    (isCompatEnabled("COMPILER_IS_ON_ELEMENT" /* COMPILER_IS_ON_ELEMENT */, context)))) {
                continue;
            }
            properties.push(createObjectProperty(createSimpleExpression(name, true, getInnerRange(loc, 0, name.length)), valueNode));
        }
        else {
            // directives
            const { name, arg, exp, loc } = prop;
            const isVBind = name === 'bind';
            const isVOn = name === 'on';
            // skip v-slot - it is handled by its dedicated transform.
            if (name === 'slot') {
                if (!isComponent) {
                    context.onError(createCompilerError(40 /* X_V_SLOT_MISPLACED */, loc));
                }
                continue;
            }
            // skip v-once/v-memo - they are handled by dedicated transforms.
            if (name === 'once' || name === 'memo') {
                continue;
            }
            // skip v-is and :is on <component>
            if (name === 'is' ||
                (isVBind &&
                    isBindKey(arg, 'is') &&
                    (isComponentTag(tag) ||
                        (isCompatEnabled("COMPILER_IS_ON_ELEMENT" /* COMPILER_IS_ON_ELEMENT */, context))))) {
                continue;
            }
            // skip v-on in SSR compilation
            if (isVOn && ssr) {
                continue;
            }
            // special case for v-bind and v-on with no argument
            if (!arg && (isVBind || isVOn)) {
                hasDynamicKeys = true;
                if (exp) {
                    if (properties.length) {
                        mergeArgs.push(createObjectExpression(dedupeProperties(properties), elementLoc));
                        properties = [];
                    }
                    if (isVBind) {
                        {
                            // 2.x v-bind object order compat
                            {
                                const hasOverridableKeys = mergeArgs.some(arg => {
                                    if (arg.type === 15 /* JS_OBJECT_EXPRESSION */) {
                                        return arg.properties.some(({ key }) => {
                                            if (key.type !== 4 /* SIMPLE_EXPRESSION */ ||
                                                !key.isStatic) {
                                                return true;
                                            }
                                            return (key.content !== 'class' &&
                                                key.content !== 'style' &&
                                                !isOn(key.content));
                                        });
                                    }
                                    else {
                                        // dynamic expression
                                        return true;
                                    }
                                });
                                if (hasOverridableKeys) {
                                    checkCompatEnabled("COMPILER_V_BIND_OBJECT_ORDER" /* COMPILER_V_BIND_OBJECT_ORDER */, context, loc);
                                }
                            }
                            if (isCompatEnabled("COMPILER_V_BIND_OBJECT_ORDER" /* COMPILER_V_BIND_OBJECT_ORDER */, context)) {
                                mergeArgs.unshift(exp);
                                continue;
                            }
                        }
                        mergeArgs.push(exp);
                    }
                    else {
                        // v-on="obj" -> toHandlers(obj)
                        mergeArgs.push({
                            type: 14 /* JS_CALL_EXPRESSION */,
                            loc,
                            callee: context.helper(TO_HANDLERS),
                            arguments: [exp]
                        });
                    }
                }
                else {
                    context.onError(createCompilerError(isVBind
                        ? 34 /* X_V_BIND_NO_EXPRESSION */
                        : 35 /* X_V_ON_NO_EXPRESSION */, loc));
                }
                continue;
            }
            const directiveTransform = context.directiveTransforms[name];
            if (directiveTransform) {
                // has built-in directive transform.
                const { props, needRuntime } = directiveTransform(prop, node, context);
                !ssr && props.forEach(analyzePatchFlag);
                properties.push(...props);
                if (needRuntime) {
                    runtimeDirectives.push(prop);
                    if (isSymbol(needRuntime)) {
                        directiveImportMap.set(prop, needRuntime);
                    }
                }
            }
            else {
                // no built-in transform, this is a user custom directive.
                runtimeDirectives.push(prop);
            }
        }
        if (prop.type === 6 /* ATTRIBUTE */ &&
            prop.name === 'ref' &&
            context.scopes.vFor > 0 &&
            checkCompatEnabled("COMPILER_V_FOR_REF" /* COMPILER_V_FOR_REF */, context, prop.loc)) {
            properties.push(createObjectProperty(createSimpleExpression('refInFor', true), createSimpleExpression('true', false)));
        }
    }
    let propsExpression = undefined;
    // has v-bind="object" or v-on="object", wrap with mergeProps
    if (mergeArgs.length) {
        if (properties.length) {
            mergeArgs.push(createObjectExpression(dedupeProperties(properties), elementLoc));
        }
        if (mergeArgs.length > 1) {
            propsExpression = createCallExpression(context.helper(MERGE_PROPS), mergeArgs, elementLoc);
        }
        else {
            // single v-bind with nothing else - no need for a mergeProps call
            propsExpression = mergeArgs[0];
        }
    }
    else if (properties.length) {
        propsExpression = createObjectExpression(dedupeProperties(properties), elementLoc);
    }
    // patchFlag analysis
    if (hasDynamicKeys) {
        patchFlag |= 16 /* FULL_PROPS */;
    }
    else {
        if (hasClassBinding && !isComponent) {
            patchFlag |= 2 /* CLASS */;
        }
        if (hasStyleBinding && !isComponent) {
            patchFlag |= 4 /* STYLE */;
        }
        if (dynamicPropNames.length) {
            patchFlag |= 8 /* PROPS */;
        }
        if (hasHydrationEventBinding) {
            patchFlag |= 32 /* HYDRATE_EVENTS */;
        }
    }
    if ((patchFlag === 0 || patchFlag === 32 /* HYDRATE_EVENTS */) &&
        (hasRef || hasVnodeHook || runtimeDirectives.length > 0)) {
        patchFlag |= 512 /* NEED_PATCH */;
    }
    // pre-normalize props, SSR is skipped for now
    if (!context.inSSR && propsExpression) {
        switch (propsExpression.type) {
            case 15 /* JS_OBJECT_EXPRESSION */:
                // means that there is no v-bind,
                // but still need to deal with dynamic key binding
                let classKeyIndex = -1;
                let styleKeyIndex = -1;
                let hasDynamicKey = false;
                for (let i = 0; i < propsExpression.properties.length; i++) {
                    const key = propsExpression.properties[i].key;
                    if (isStaticExp(key)) {
                        if (key.content === 'class') {
                            classKeyIndex = i;
                        }
                        else if (key.content === 'style') {
                            styleKeyIndex = i;
                        }
                    }
                    else if (!key.isHandlerKey) {
                        hasDynamicKey = true;
                    }
                }
                const classProp = propsExpression.properties[classKeyIndex];
                const styleProp = propsExpression.properties[styleKeyIndex];
                // no dynamic key
                if (!hasDynamicKey) {
                    if (classProp && !isStaticExp(classProp.value)) {
                        classProp.value = createCallExpression(context.helper(NORMALIZE_CLASS), [classProp.value]);
                    }
                    if (styleProp &&
                        !isStaticExp(styleProp.value) &&
                        // the static style is compiled into an object,
                        // so use `hasStyleBinding` to ensure that it is a dynamic style binding
                        (hasStyleBinding ||
                            // v-bind:style and style both exist,
                            // v-bind:style with static literal object
                            styleProp.value.type === 17 /* JS_ARRAY_EXPRESSION */)) {
                        styleProp.value = createCallExpression(context.helper(NORMALIZE_STYLE), [styleProp.value]);
                    }
                }
                else {
                    // dynamic key binding, wrap with `normalizeProps`
                    propsExpression = createCallExpression(context.helper(NORMALIZE_PROPS), [propsExpression]);
                }
                break;
            case 14 /* JS_CALL_EXPRESSION */:
                // mergeProps call, do nothing
                break;
            default:
                // single v-bind
                propsExpression = createCallExpression(context.helper(NORMALIZE_PROPS), [
                    createCallExpression(context.helper(GUARD_REACTIVE_PROPS), [
                        propsExpression
                    ])
                ]);
                break;
        }
    }
    return {
        props: propsExpression,
        directives: runtimeDirectives,
        patchFlag,
        dynamicPropNames
    };
}
// Dedupe props in an object literal.
// Literal duplicated attributes would have been warned during the parse phase,
// however, it's possible to encounter duplicated `onXXX` handlers with different
// modifiers. We also need to merge static and dynamic class / style attributes.
// - onXXX handlers / style: merge into array
// - class: merge into single expression with concatenation
function dedupeProperties(properties) {
    const knownProps = new Map();
    const deduped = [];
    for (let i = 0; i < properties.length; i++) {
        const prop = properties[i];
        // dynamic keys are always allowed
        if (prop.key.type === 8 /* COMPOUND_EXPRESSION */ || !prop.key.isStatic) {
            deduped.push(prop);
            continue;
        }
        const name = prop.key.content;
        const existing = knownProps.get(name);
        if (existing) {
            if (name === 'style' || name === 'class' || name.startsWith('on')) {
                mergeAsArray(existing, prop);
            }
            // unexpected duplicate, should have emitted error during parse
        }
        else {
            knownProps.set(name, prop);
            deduped.push(prop);
        }
    }
    return deduped;
}
function mergeAsArray(existing, incoming) {
    if (existing.value.type === 17 /* JS_ARRAY_EXPRESSION */) {
        existing.value.elements.push(incoming.value);
    }
    else {
        existing.value = createArrayExpression([existing.value, incoming.value], existing.loc);
    }
}
function buildDirectiveArgs(dir, context) {
    const dirArgs = [];
    const runtime = directiveImportMap.get(dir);
    if (runtime) {
        // built-in directive with runtime
        dirArgs.push(context.helperString(runtime));
    }
    else {
        {
            // inject statement for resolving directive
            context.helper(RESOLVE_DIRECTIVE);
            context.directives.add(dir.name);
            dirArgs.push(toValidAssetId(dir.name, `directive`));
        }
    }
    const { loc } = dir;
    if (dir.exp)
        dirArgs.push(dir.exp);
    if (dir.arg) {
        if (!dir.exp) {
            dirArgs.push(`void 0`);
        }
        dirArgs.push(dir.arg);
    }
    if (Object.keys(dir.modifiers).length) {
        if (!dir.arg) {
            if (!dir.exp) {
                dirArgs.push(`void 0`);
            }
            dirArgs.push(`void 0`);
        }
        const trueExpression = createSimpleExpression(`true`, false, loc);
        dirArgs.push(createObjectExpression(dir.modifiers.map(modifier => createObjectProperty(modifier, trueExpression)), loc));
    }
    return createArrayExpression(dirArgs, dir.loc);
}
function stringifyDynamicPropNames(props) {
    let propsNamesString = `[`;
    for (let i = 0, l = props.length; i < l; i++) {
        propsNamesString += JSON.stringify(props[i]);
        if (i < l - 1)
            propsNamesString += ', ';
    }
    return propsNamesString + `]`;
}
function isComponentTag(tag) {
    return tag[0].toLowerCase() + tag.slice(1) === 'component';
}

const transformSlotOutlet = (node, context) => {
    if (isSlotOutlet(node)) {
        const { children, loc } = node;
        const { slotName, slotProps } = processSlotOutlet(node, context);
        const slotArgs = [
            context.prefixIdentifiers ? `_ctx.$slots` : `$slots`,
            slotName
        ];
        if (slotProps) {
            slotArgs.push(slotProps);
        }
        if (children.length) {
            if (!slotProps) {
                slotArgs.push(`{}`);
            }
            slotArgs.push(createFunctionExpression([], children, false, false, loc));
        }
        if (context.scopeId && !context.slotted) {
            if (!slotProps) {
                slotArgs.push(`{}`);
            }
            if (!children.length) {
                slotArgs.push(`undefined`);
            }
            slotArgs.push(`true`);
        }
        node.codegenNode = createCallExpression(context.helper(RENDER_SLOT), slotArgs, loc);
    }
};
function processSlotOutlet(node, context) {
    let slotName = `"default"`;
    let slotProps = undefined;
    const nonNameProps = [];
    for (let i = 0; i < node.props.length; i++) {
        const p = node.props[i];
        if (p.type === 6 /* ATTRIBUTE */) {
            if (p.value) {
                if (p.name === 'name') {
                    slotName = JSON.stringify(p.value.content);
                }
                else {
                    p.name = camelize(p.name);
                    nonNameProps.push(p);
                }
            }
        }
        else {
            if (p.name === 'bind' && isBindKey(p.arg, 'name')) {
                if (p.exp)
                    slotName = p.exp;
            }
            else {
                if (p.name === 'bind' && p.arg && isStaticExp(p.arg)) {
                    p.arg.content = camelize(p.arg.content);
                }
                nonNameProps.push(p);
            }
        }
    }
    if (nonNameProps.length > 0) {
        const { props, directives } = buildProps(node, context, nonNameProps);
        slotProps = props;
        if (directives.length) {
            context.onError(createCompilerError(36 /* X_V_SLOT_UNEXPECTED_DIRECTIVE_ON_SLOT_OUTLET */, directives[0].loc));
        }
    }
    return {
        slotName,
        slotProps
    };
}

const fnExpRE = /^\s*([\w$_]+|\([^)]*?\))\s*=>|^\s*function(?:\s+[\w$]+)?\s*\(/;
const transformOn = (dir, node, context, augmentor) => {
    const { loc, modifiers, arg } = dir;
    if (!dir.exp && !modifiers.length) {
        context.onError(createCompilerError(35 /* X_V_ON_NO_EXPRESSION */, loc));
    }
    let eventName;
    if (arg.type === 4 /* SIMPLE_EXPRESSION */) {
        if (arg.isStatic) {
            const rawName = arg.content;
            // for all event listeners, auto convert it to camelCase. See issue #2249
            eventName = createSimpleExpression(toHandlerKey(camelize(rawName)), true, arg.loc);
        }
        else {
            // #2388
            eventName = createCompoundExpression([
                `${context.helperString(TO_HANDLER_KEY)}(`,
                arg,
                `)`
            ]);
        }
    }
    else {
        // already a compound expression.
        eventName = arg;
        eventName.children.unshift(`${context.helperString(TO_HANDLER_KEY)}(`);
        eventName.children.push(`)`);
    }
    // handler processing
    let exp = dir.exp;
    if (exp && !exp.content.trim()) {
        exp = undefined;
    }
    let shouldCache = context.cacheHandlers && !exp && !context.inVOnce;
    if (exp) {
        const isMemberExp = isMemberExpression(exp.content);
        const isInlineStatement = !(isMemberExp || fnExpRE.test(exp.content));
        const hasMultipleStatements = exp.content.includes(`;`);
        {
            validateBrowserExpression(exp, context, false, hasMultipleStatements);
        }
        if (isInlineStatement || (shouldCache && isMemberExp)) {
            // wrap inline statement in a function expression
            exp = createCompoundExpression([
                `${isInlineStatement
                    ? `$event`
                    : `${``}(...args)`} => ${hasMultipleStatements ? `{` : `(`}`,
                exp,
                hasMultipleStatements ? `}` : `)`
            ]);
        }
    }
    let ret = {
        props: [
            createObjectProperty(eventName, exp || createSimpleExpression(`() => {}`, false, loc))
        ]
    };
    // apply extended compiler augmentor
    if (augmentor) {
        ret = augmentor(ret);
    }
    if (shouldCache) {
        // cache handlers so that it's always the same handler being passed down.
        // this avoids unnecessary re-renders when users use inline handlers on
        // components.
        ret.props[0].value = context.cache(ret.props[0].value);
    }
    // mark the key as handler for props normalization check
    ret.props.forEach(p => (p.key.isHandlerKey = true));
    return ret;
};

// v-bind without arg is handled directly in ./transformElements.ts due to it affecting
// codegen for the entire props object. This transform here is only for v-bind
// *with* args.
const transformBind = (dir, _node, context) => {
    const { exp, modifiers, loc } = dir;
    const arg = dir.arg;
    if (arg.type !== 4 /* SIMPLE_EXPRESSION */) {
        arg.children.unshift(`(`);
        arg.children.push(`) || ""`);
    }
    else if (!arg.isStatic) {
        arg.content = `${arg.content} || ""`;
    }
    // .sync is replaced by v-model:arg
    if (modifiers.includes('camel')) {
        if (arg.type === 4 /* SIMPLE_EXPRESSION */) {
            if (arg.isStatic) {
                arg.content = camelize(arg.content);
            }
            else {
                arg.content = `${context.helperString(CAMELIZE)}(${arg.content})`;
            }
        }
        else {
            arg.children.unshift(`${context.helperString(CAMELIZE)}(`);
            arg.children.push(`)`);
        }
    }
    if (!context.inSSR) {
        if (modifiers.includes('prop')) {
            injectPrefix(arg, '.');
        }
        if (modifiers.includes('attr')) {
            injectPrefix(arg, '^');
        }
    }
    if (!exp ||
        (exp.type === 4 /* SIMPLE_EXPRESSION */ && !exp.content.trim())) {
        context.onError(createCompilerError(34 /* X_V_BIND_NO_EXPRESSION */, loc));
        return {
            props: [createObjectProperty(arg, createSimpleExpression('', true, loc))]
        };
    }
    return {
        props: [createObjectProperty(arg, exp)]
    };
};
const injectPrefix = (arg, prefix) => {
    if (arg.type === 4 /* SIMPLE_EXPRESSION */) {
        if (arg.isStatic) {
            arg.content = prefix + arg.content;
        }
        else {
            arg.content = `\`${prefix}\${${arg.content}}\``;
        }
    }
    else {
        arg.children.unshift(`'${prefix}' + (`);
        arg.children.push(`)`);
    }
};

// Merge adjacent text nodes and expressions into a single expression
// e.g. <div>abc {{ d }} {{ e }}</div> should have a single expression node as child.
const transformText = (node, context) => {
    if (node.type === 0 /* ROOT */ ||
        node.type === 1 /* ELEMENT */ ||
        node.type === 11 /* FOR */ ||
        node.type === 10 /* IF_BRANCH */) {
        // perform the transform on node exit so that all expressions have already
        // been processed.
        return () => {
            const children = node.children;
            let currentContainer = undefined;
            let hasText = false;
            for (let i = 0; i < children.length; i++) {
                const child = children[i];
                if (isText(child)) {
                    hasText = true;
                    for (let j = i + 1; j < children.length; j++) {
                        const next = children[j];
                        if (isText(next)) {
                            if (!currentContainer) {
                                currentContainer = children[i] = {
                                    type: 8 /* COMPOUND_EXPRESSION */,
                                    loc: child.loc,
                                    children: [child]
                                };
                            }
                            // merge adjacent text node into current
                            currentContainer.children.push(` + `, next);
                            children.splice(j, 1);
                            j--;
                        }
                        else {
                            currentContainer = undefined;
                            break;
                        }
                    }
                }
            }
            if (!hasText ||
                // if this is a plain element with a single text child, leave it
                // as-is since the runtime has dedicated fast path for this by directly
                // setting textContent of the element.
                // for component root it's always normalized anyway.
                (children.length === 1 &&
                    (node.type === 0 /* ROOT */ ||
                        (node.type === 1 /* ELEMENT */ &&
                            node.tagType === 0 /* ELEMENT */ &&
                            // #3756
                            // custom directives can potentially add DOM elements arbitrarily,
                            // we need to avoid setting textContent of the element at runtime
                            // to avoid accidentally overwriting the DOM elements added
                            // by the user through custom directives.
                            !node.props.find(p => p.type === 7 /* DIRECTIVE */ &&
                                !context.directiveTransforms[p.name]) &&
                            // in compat mode, <template> tags with no special directives
                            // will be rendered as a fragment so its children must be
                            // converted into vnodes.
                            !(node.tag === 'template'))))) {
                return;
            }
            // pre-convert text nodes into createTextVNode(text) calls to avoid
            // runtime normalization.
            for (let i = 0; i < children.length; i++) {
                const child = children[i];
                if (isText(child) || child.type === 8 /* COMPOUND_EXPRESSION */) {
                    const callArgs = [];
                    // createTextVNode defaults to single whitespace, so if it is a
                    // single space the code could be an empty call to save bytes.
                    if (child.type !== 2 /* TEXT */ || child.content !== ' ') {
                        callArgs.push(child);
                    }
                    // mark dynamic text with flag so it gets patched inside a block
                    if (!context.ssr &&
                        getConstantType(child, context) === 0 /* NOT_CONSTANT */) {
                        callArgs.push(1 /* TEXT */ +
                            (` /* ${PatchFlagNames[1 /* TEXT */]} */` ));
                    }
                    children[i] = {
                        type: 12 /* TEXT_CALL */,
                        content: child,
                        loc: child.loc,
                        codegenNode: createCallExpression(context.helper(CREATE_TEXT), callArgs)
                    };
                }
            }
        };
    }
};

const seen = new WeakSet();
const transformOnce = (node, context) => {
    if (node.type === 1 /* ELEMENT */ && findDir(node, 'once', true)) {
        if (seen.has(node) || context.inVOnce) {
            return;
        }
        seen.add(node);
        context.inVOnce = true;
        context.helper(SET_BLOCK_TRACKING);
        return () => {
            context.inVOnce = false;
            const cur = context.currentNode;
            if (cur.codegenNode) {
                cur.codegenNode = context.cache(cur.codegenNode, true /* isVNode */);
            }
        };
    }
};

const transformModel = (dir, node, context) => {
    const { exp, arg } = dir;
    if (!exp) {
        context.onError(createCompilerError(41 /* X_V_MODEL_NO_EXPRESSION */, dir.loc));
        return createTransformProps();
    }
    const rawExp = exp.loc.source;
    const expString = exp.type === 4 /* SIMPLE_EXPRESSION */ ? exp.content : rawExp;
    // im SFC <script setup> inline mode, the exp may have been transformed into
    // _unref(exp)
    context.bindingMetadata[rawExp];
    const maybeRef = !true    /* SETUP_CONST */;
    if (!expString.trim() || (!isMemberExpression(expString) && !maybeRef)) {
        context.onError(createCompilerError(42 /* X_V_MODEL_MALFORMED_EXPRESSION */, exp.loc));
        return createTransformProps();
    }
    const propName = arg ? arg : createSimpleExpression('modelValue', true);
    const eventName = arg
        ? isStaticExp(arg)
            ? `onUpdate:${arg.content}`
            : createCompoundExpression(['"onUpdate:" + ', arg])
        : `onUpdate:modelValue`;
    let assignmentExp;
    const eventArg = context.isTS ? `($event: any)` : `$event`;
    {
        assignmentExp = createCompoundExpression([
            `${eventArg} => (`,
            exp,
            ` = $event)`
        ]);
    }
    const props = [
        // modelValue: foo
        createObjectProperty(propName, dir.exp),
        // "onUpdate:modelValue": $event => (foo = $event)
        createObjectProperty(eventName, assignmentExp)
    ];
    // modelModifiers: { foo: true, "bar-baz": true }
    if (dir.modifiers.length && node.tagType === 1 /* COMPONENT */) {
        const modifiers = dir.modifiers
            .map(m => (isSimpleIdentifier(m) ? m : JSON.stringify(m)) + `: true`)
            .join(`, `);
        const modifiersKey = arg
            ? isStaticExp(arg)
                ? `${arg.content}Modifiers`
                : createCompoundExpression([arg, ' + "Modifiers"'])
            : `modelModifiers`;
        props.push(createObjectProperty(modifiersKey, createSimpleExpression(`{ ${modifiers} }`, false, dir.loc, 2 /* CAN_HOIST */)));
    }
    return createTransformProps(props);
};
function createTransformProps(props = []) {
    return { props };
}

const validDivisionCharRE = /[\w).+\-_$\]]/;
const transformFilter = (node, context) => {
    if (!isCompatEnabled("COMPILER_FILTER" /* COMPILER_FILTERS */, context)) {
        return;
    }
    if (node.type === 5 /* INTERPOLATION */) {
        // filter rewrite is applied before expression transform so only
        // simple expressions are possible at this stage
        rewriteFilter(node.content, context);
    }
    if (node.type === 1 /* ELEMENT */) {
        node.props.forEach((prop) => {
            if (prop.type === 7 /* DIRECTIVE */ &&
                prop.name !== 'for' &&
                prop.exp) {
                rewriteFilter(prop.exp, context);
            }
        });
    }
};
function rewriteFilter(node, context) {
    if (node.type === 4 /* SIMPLE_EXPRESSION */) {
        parseFilter(node, context);
    }
    else {
        for (let i = 0; i < node.children.length; i++) {
            const child = node.children[i];
            if (typeof child !== 'object')
                continue;
            if (child.type === 4 /* SIMPLE_EXPRESSION */) {
                parseFilter(child, context);
            }
            else if (child.type === 8 /* COMPOUND_EXPRESSION */) {
                rewriteFilter(node, context);
            }
            else if (child.type === 5 /* INTERPOLATION */) {
                rewriteFilter(child.content, context);
            }
        }
    }
}
function parseFilter(node, context) {
    const exp = node.content;
    let inSingle = false;
    let inDouble = false;
    let inTemplateString = false;
    let inRegex = false;
    let curly = 0;
    let square = 0;
    let paren = 0;
    let lastFilterIndex = 0;
    let c, prev, i, expression, filters = [];
    for (i = 0; i < exp.length; i++) {
        prev = c;
        c = exp.charCodeAt(i);
        if (inSingle) {
            if (c === 0x27 && prev !== 0x5c)
                inSingle = false;
        }
        else if (inDouble) {
            if (c === 0x22 && prev !== 0x5c)
                inDouble = false;
        }
        else if (inTemplateString) {
            if (c === 0x60 && prev !== 0x5c)
                inTemplateString = false;
        }
        else if (inRegex) {
            if (c === 0x2f && prev !== 0x5c)
                inRegex = false;
        }
        else if (c === 0x7c && // pipe
            exp.charCodeAt(i + 1) !== 0x7c &&
            exp.charCodeAt(i - 1) !== 0x7c &&
            !curly &&
            !square &&
            !paren) {
            if (expression === undefined) {
                // first filter, end of expression
                lastFilterIndex = i + 1;
                expression = exp.slice(0, i).trim();
            }
            else {
                pushFilter();
            }
        }
        else {
            switch (c) {
                case 0x22:
                    inDouble = true;
                    break; // "
                case 0x27:
                    inSingle = true;
                    break; // '
                case 0x60:
                    inTemplateString = true;
                    break; // `
                case 0x28:
                    paren++;
                    break; // (
                case 0x29:
                    paren--;
                    break; // )
                case 0x5b:
                    square++;
                    break; // [
                case 0x5d:
                    square--;
                    break; // ]
                case 0x7b:
                    curly++;
                    break; // {
                case 0x7d:
                    curly--;
                    break; // }
            }
            if (c === 0x2f) {
                // /
                let j = i - 1;
                let p;
                // find first non-whitespace prev char
                for (; j >= 0; j--) {
                    p = exp.charAt(j);
                    if (p !== ' ')
                        break;
                }
                if (!p || !validDivisionCharRE.test(p)) {
                    inRegex = true;
                }
            }
        }
    }
    if (expression === undefined) {
        expression = exp.slice(0, i).trim();
    }
    else if (lastFilterIndex !== 0) {
        pushFilter();
    }
    function pushFilter() {
        filters.push(exp.slice(lastFilterIndex, i).trim());
        lastFilterIndex = i + 1;
    }
    if (filters.length) {
        warnDeprecation("COMPILER_FILTER" /* COMPILER_FILTERS */, context, node.loc);
        for (i = 0; i < filters.length; i++) {
            expression = wrapFilter(expression, filters[i], context);
        }
        node.content = expression;
    }
}
function wrapFilter(exp, filter, context) {
    context.helper(RESOLVE_FILTER);
    const i = filter.indexOf('(');
    if (i < 0) {
        context.filters.add(filter);
        return `${toValidAssetId(filter, 'filter')}(${exp})`;
    }
    else {
        const name = filter.slice(0, i);
        const args = filter.slice(i + 1);
        context.filters.add(name);
        return `${toValidAssetId(name, 'filter')}(${exp}${args !== ')' ? ',' + args : args}`;
    }
}

const seen$1 = new WeakSet();
const transformMemo = (node, context) => {
    if (node.type === 1 /* ELEMENT */) {
        const dir = findDir(node, 'memo');
        if (!dir || seen$1.has(node)) {
            return;
        }
        seen$1.add(node);
        return () => {
            const codegenNode = node.codegenNode ||
                context.currentNode.codegenNode;
            if (codegenNode && codegenNode.type === 13 /* VNODE_CALL */) {
                // non-component sub tree should be turned into a block
                if (node.tagType !== 1 /* COMPONENT */) {
                    makeBlock(codegenNode, context);
                }
                node.codegenNode = createCallExpression(context.helper(WITH_MEMO), [
                    dir.exp,
                    createFunctionExpression(undefined, codegenNode),
                    `_cache`,
                    String(context.cached++)
                ]);
            }
        };
    }
};

function getBaseTransformPreset(prefixIdentifiers) {
    return [
        [
            transformOnce,
            transformIf,
            transformMemo,
            transformFor,
            ...([transformFilter] ),
            ...([transformExpression]
                    ),
            transformSlotOutlet,
            transformElement,
            trackSlotScopes,
            transformText
        ],
        {
            on: transformOn,
            bind: transformBind,
            model: transformModel
        }
    ];
}
// we name it `baseCompile` so that higher order compilers like
// @vue/compiler-dom can export `compile` while re-exporting everything else.
function baseCompile(template, options = {}) {
    const onError = options.onError || defaultOnError;
    const isModuleMode = options.mode === 'module';
    /* istanbul ignore if */
    {
        if (options.prefixIdentifiers === true) {
            onError(createCompilerError(46 /* X_PREFIX_ID_NOT_SUPPORTED */));
        }
        else if (isModuleMode) {
            onError(createCompilerError(47 /* X_MODULE_MODE_NOT_SUPPORTED */));
        }
    }
    const prefixIdentifiers = !true ;
    if (options.cacheHandlers) {
        onError(createCompilerError(48 /* X_CACHE_HANDLER_NOT_SUPPORTED */));
    }
    if (options.scopeId && !isModuleMode) {
        onError(createCompilerError(49 /* X_SCOPE_ID_NOT_SUPPORTED */));
    }
    const ast = isString(template) ? baseParse(template, options) : template;
    const [nodeTransforms, directiveTransforms] = getBaseTransformPreset();
    transform(ast, extend({}, options, {
        prefixIdentifiers,
        nodeTransforms: [
            ...nodeTransforms,
            ...(options.nodeTransforms || []) // user transforms
        ],
        directiveTransforms: extend({}, directiveTransforms, options.directiveTransforms || {} // user transforms
        )
    }));
    return generate(ast, extend({}, options, {
        prefixIdentifiers
    }));
}

const noopDirectiveTransform = () => ({ props: [] });

const V_MODEL_RADIO = Symbol(`vModelRadio` );
const V_MODEL_CHECKBOX = Symbol(`vModelCheckbox` );
const V_MODEL_TEXT = Symbol(`vModelText` );
const V_MODEL_SELECT = Symbol(`vModelSelect` );
const V_MODEL_DYNAMIC = Symbol(`vModelDynamic` );
const V_ON_WITH_MODIFIERS = Symbol(`vOnModifiersGuard` );
const V_ON_WITH_KEYS = Symbol(`vOnKeysGuard` );
const V_SHOW = Symbol(`vShow` );
const TRANSITION = Symbol(`Transition` );
const TRANSITION_GROUP = Symbol(`TransitionGroup` );
registerRuntimeHelpers({
    [V_MODEL_RADIO]: `vModelRadio`,
    [V_MODEL_CHECKBOX]: `vModelCheckbox`,
    [V_MODEL_TEXT]: `vModelText`,
    [V_MODEL_SELECT]: `vModelSelect`,
    [V_MODEL_DYNAMIC]: `vModelDynamic`,
    [V_ON_WITH_MODIFIERS]: `withModifiers`,
    [V_ON_WITH_KEYS]: `withKeys`,
    [V_SHOW]: `vShow`,
    [TRANSITION]: `Transition`,
    [TRANSITION_GROUP]: `TransitionGroup`
});

/* eslint-disable no-restricted-globals */
let decoder;
function decodeHtmlBrowser(raw, asAttr = false) {
    if (!decoder) {
        decoder = document.createElement('div');
    }
    if (asAttr) {
        decoder.innerHTML = `<div foo="${raw.replace(/"/g, '&quot;')}">`;
        return decoder.children[0].getAttribute('foo');
    }
    else {
        decoder.innerHTML = raw;
        return decoder.textContent;
    }
}

const isRawTextContainer = /*#__PURE__*/ makeMap('style,iframe,script,noscript', true);
const parserOptions = {
    isVoidTag,
    isNativeTag: tag => isHTMLTag(tag) || isSVGTag(tag),
    isPreTag: tag => tag === 'pre',
    decodeEntities: decodeHtmlBrowser ,
    isBuiltInComponent: (tag) => {
        if (isBuiltInType(tag, `Transition`)) {
            return TRANSITION;
        }
        else if (isBuiltInType(tag, `TransitionGroup`)) {
            return TRANSITION_GROUP;
        }
    },
    // https://html.spec.whatwg.org/multipage/parsing.html#tree-construction-dispatcher
    getNamespace(tag, parent) {
        let ns = parent ? parent.ns : 0 /* HTML */;
        if (parent && ns === 2 /* MATH_ML */) {
            if (parent.tag === 'annotation-xml') {
                if (tag === 'svg') {
                    return 1 /* SVG */;
                }
                if (parent.props.some(a => a.type === 6 /* ATTRIBUTE */ &&
                    a.name === 'encoding' &&
                    a.value != null &&
                    (a.value.content === 'text/html' ||
                        a.value.content === 'application/xhtml+xml'))) {
                    ns = 0 /* HTML */;
                }
            }
            else if (/^m(?:[ions]|text)$/.test(parent.tag) &&
                tag !== 'mglyph' &&
                tag !== 'malignmark') {
                ns = 0 /* HTML */;
            }
        }
        else if (parent && ns === 1 /* SVG */) {
            if (parent.tag === 'foreignObject' ||
                parent.tag === 'desc' ||
                parent.tag === 'title') {
                ns = 0 /* HTML */;
            }
        }
        if (ns === 0 /* HTML */) {
            if (tag === 'svg') {
                return 1 /* SVG */;
            }
            if (tag === 'math') {
                return 2 /* MATH_ML */;
            }
        }
        return ns;
    },
    // https://html.spec.whatwg.org/multipage/parsing.html#parsing-html-fragments
    getTextMode({ tag, ns }) {
        if (ns === 0 /* HTML */) {
            if (tag === 'textarea' || tag === 'title') {
                return 1 /* RCDATA */;
            }
            if (isRawTextContainer(tag)) {
                return 2 /* RAWTEXT */;
            }
        }
        return 0 /* DATA */;
    }
};

// Parse inline CSS strings for static style attributes into an object.
// This is a NodeTransform since it works on the static `style` attribute and
// converts it into a dynamic equivalent:
// style="color: red" -> :style='{ "color": "red" }'
// It is then processed by `transformElement` and included in the generated
// props.
const transformStyle = node => {
    if (node.type === 1 /* ELEMENT */) {
        node.props.forEach((p, i) => {
            if (p.type === 6 /* ATTRIBUTE */ && p.name === 'style' && p.value) {
                // replace p with an expression node
                node.props[i] = {
                    type: 7 /* DIRECTIVE */,
                    name: `bind`,
                    arg: createSimpleExpression(`style`, true, p.loc),
                    exp: parseInlineCSS(p.value.content, p.loc),
                    modifiers: [],
                    loc: p.loc
                };
            }
        });
    }
};
const parseInlineCSS = (cssText, loc) => {
    const normalized = parseStringStyle(cssText);
    return createSimpleExpression(JSON.stringify(normalized), false, loc, 3 /* CAN_STRINGIFY */);
};

function createDOMCompilerError(code, loc) {
    return createCompilerError(code, loc, DOMErrorMessages );
}
const DOMErrorMessages = {
    [50 /* X_V_HTML_NO_EXPRESSION */]: `v-html is missing expression.`,
    [51 /* X_V_HTML_WITH_CHILDREN */]: `v-html will override element children.`,
    [52 /* X_V_TEXT_NO_EXPRESSION */]: `v-text is missing expression.`,
    [53 /* X_V_TEXT_WITH_CHILDREN */]: `v-text will override element children.`,
    [54 /* X_V_MODEL_ON_INVALID_ELEMENT */]: `v-model can only be used on <input>, <textarea> and <select> elements.`,
    [55 /* X_V_MODEL_ARG_ON_ELEMENT */]: `v-model argument is not supported on plain elements.`,
    [56 /* X_V_MODEL_ON_FILE_INPUT_ELEMENT */]: `v-model cannot be used on file inputs since they are read-only. Use a v-on:change listener instead.`,
    [57 /* X_V_MODEL_UNNECESSARY_VALUE */]: `Unnecessary value binding used alongside v-model. It will interfere with v-model's behavior.`,
    [58 /* X_V_SHOW_NO_EXPRESSION */]: `v-show is missing expression.`,
    [59 /* X_TRANSITION_INVALID_CHILDREN */]: `<Transition> expects exactly one child element or component.`,
    [60 /* X_IGNORED_SIDE_EFFECT_TAG */]: `Tags with side effect (<script> and <style>) are ignored in client component templates.`
};

const transformVHtml = (dir, node, context) => {
    const { exp, loc } = dir;
    if (!exp) {
        context.onError(createDOMCompilerError(50 /* X_V_HTML_NO_EXPRESSION */, loc));
    }
    if (node.children.length) {
        context.onError(createDOMCompilerError(51 /* X_V_HTML_WITH_CHILDREN */, loc));
        node.children.length = 0;
    }
    return {
        props: [
            createObjectProperty(createSimpleExpression(`innerHTML`, true, loc), exp || createSimpleExpression('', true))
        ]
    };
};

const transformVText = (dir, node, context) => {
    const { exp, loc } = dir;
    if (!exp) {
        context.onError(createDOMCompilerError(52 /* X_V_TEXT_NO_EXPRESSION */, loc));
    }
    if (node.children.length) {
        context.onError(createDOMCompilerError(53 /* X_V_TEXT_WITH_CHILDREN */, loc));
        node.children.length = 0;
    }
    return {
        props: [
            createObjectProperty(createSimpleExpression(`textContent`, true), exp
                ? createCallExpression(context.helperString(TO_DISPLAY_STRING), [exp], loc)
                : createSimpleExpression('', true))
        ]
    };
};

const transformModel$1 = (dir, node, context) => {
    const baseResult = transformModel(dir, node, context);
    // base transform has errors OR component v-model (only need props)
    if (!baseResult.props.length || node.tagType === 1 /* COMPONENT */) {
        return baseResult;
    }
    if (dir.arg) {
        context.onError(createDOMCompilerError(55 /* X_V_MODEL_ARG_ON_ELEMENT */, dir.arg.loc));
    }
    function checkDuplicatedValue() {
        const value = findProp(node, 'value');
        if (value) {
            context.onError(createDOMCompilerError(57 /* X_V_MODEL_UNNECESSARY_VALUE */, value.loc));
        }
    }
    const { tag } = node;
    const isCustomElement = context.isCustomElement(tag);
    if (tag === 'input' ||
        tag === 'textarea' ||
        tag === 'select' ||
        isCustomElement) {
        let directiveToUse = V_MODEL_TEXT;
        let isInvalidType = false;
        if (tag === 'input' || isCustomElement) {
            const type = findProp(node, `type`);
            if (type) {
                if (type.type === 7 /* DIRECTIVE */) {
                    // :type="foo"
                    directiveToUse = V_MODEL_DYNAMIC;
                }
                else if (type.value) {
                    switch (type.value.content) {
                        case 'radio':
                            directiveToUse = V_MODEL_RADIO;
                            break;
                        case 'checkbox':
                            directiveToUse = V_MODEL_CHECKBOX;
                            break;
                        case 'file':
                            isInvalidType = true;
                            context.onError(createDOMCompilerError(56 /* X_V_MODEL_ON_FILE_INPUT_ELEMENT */, dir.loc));
                            break;
                        default:
                            // text type
                            checkDuplicatedValue();
                            break;
                    }
                }
            }
            else if (hasDynamicKeyVBind(node)) {
                // element has bindings with dynamic keys, which can possibly contain
                // "type".
                directiveToUse = V_MODEL_DYNAMIC;
            }
            else {
                // text type
                checkDuplicatedValue();
            }
        }
        else if (tag === 'select') {
            directiveToUse = V_MODEL_SELECT;
        }
        else {
            // textarea
            checkDuplicatedValue();
        }
        // inject runtime directive
        // by returning the helper symbol via needRuntime
        // the import will replaced a resolveDirective call.
        if (!isInvalidType) {
            baseResult.needRuntime = context.helper(directiveToUse);
        }
    }
    else {
        context.onError(createDOMCompilerError(54 /* X_V_MODEL_ON_INVALID_ELEMENT */, dir.loc));
    }
    // native vmodel doesn't need the `modelValue` props since they are also
    // passed to the runtime as `binding.value`. removing it reduces code size.
    baseResult.props = baseResult.props.filter(p => !(p.key.type === 4 /* SIMPLE_EXPRESSION */ &&
        p.key.content === 'modelValue'));
    return baseResult;
};

const isEventOptionModifier = /*#__PURE__*/ makeMap(`passive,once,capture`);
const isNonKeyModifier = /*#__PURE__*/ makeMap(
// event propagation management
`stop,prevent,self,` +
    // system modifiers + exact
    `ctrl,shift,alt,meta,exact,` +
    // mouse
    `middle`);
// left & right could be mouse or key modifiers based on event type
const maybeKeyModifier = /*#__PURE__*/ makeMap('left,right');
const isKeyboardEvent = /*#__PURE__*/ makeMap(`onkeyup,onkeydown,onkeypress`, true);
const resolveModifiers = (key, modifiers, context, loc) => {
    const keyModifiers = [];
    const nonKeyModifiers = [];
    const eventOptionModifiers = [];
    for (let i = 0; i < modifiers.length; i++) {
        const modifier = modifiers[i];
        if (modifier === 'native' &&
            checkCompatEnabled("COMPILER_V_ON_NATIVE" /* COMPILER_V_ON_NATIVE */, context, loc)) {
            eventOptionModifiers.push(modifier);
        }
        else if (isEventOptionModifier(modifier)) {
            // eventOptionModifiers: modifiers for addEventListener() options,
            // e.g. .passive & .capture
            eventOptionModifiers.push(modifier);
        }
        else {
            // runtimeModifiers: modifiers that needs runtime guards
            if (maybeKeyModifier(modifier)) {
                if (isStaticExp(key)) {
                    if (isKeyboardEvent(key.content)) {
                        keyModifiers.push(modifier);
                    }
                    else {
                        nonKeyModifiers.push(modifier);
                    }
                }
                else {
                    keyModifiers.push(modifier);
                    nonKeyModifiers.push(modifier);
                }
            }
            else {
                if (isNonKeyModifier(modifier)) {
                    nonKeyModifiers.push(modifier);
                }
                else {
                    keyModifiers.push(modifier);
                }
            }
        }
    }
    return {
        keyModifiers,
        nonKeyModifiers,
        eventOptionModifiers
    };
};
const transformClick = (key, event) => {
    const isStaticClick = isStaticExp(key) && key.content.toLowerCase() === 'onclick';
    return isStaticClick
        ? createSimpleExpression(event, true)
        : key.type !== 4 /* SIMPLE_EXPRESSION */
            ? createCompoundExpression([
                `(`,
                key,
                `) === "onClick" ? "${event}" : (`,
                key,
                `)`
            ])
            : key;
};
const transformOn$1 = (dir, node, context) => {
    return transformOn(dir, node, context, baseResult => {
        const { modifiers } = dir;
        if (!modifiers.length)
            return baseResult;
        let { key, value: handlerExp } = baseResult.props[0];
        const { keyModifiers, nonKeyModifiers, eventOptionModifiers } = resolveModifiers(key, modifiers, context, dir.loc);
        // normalize click.right and click.middle since they don't actually fire
        if (nonKeyModifiers.includes('right')) {
            key = transformClick(key, `onContextmenu`);
        }
        if (nonKeyModifiers.includes('middle')) {
            key = transformClick(key, `onMouseup`);
        }
        if (nonKeyModifiers.length) {
            handlerExp = createCallExpression(context.helper(V_ON_WITH_MODIFIERS), [
                handlerExp,
                JSON.stringify(nonKeyModifiers)
            ]);
        }
        if (keyModifiers.length &&
            // if event name is dynamic, always wrap with keys guard
            (!isStaticExp(key) || isKeyboardEvent(key.content))) {
            handlerExp = createCallExpression(context.helper(V_ON_WITH_KEYS), [
                handlerExp,
                JSON.stringify(keyModifiers)
            ]);
        }
        if (eventOptionModifiers.length) {
            const modifierPostfix = eventOptionModifiers.map(capitalize).join('');
            key = isStaticExp(key)
                ? createSimpleExpression(`${key.content}${modifierPostfix}`, true)
                : createCompoundExpression([`(`, key, `) + "${modifierPostfix}"`]);
        }
        return {
            props: [createObjectProperty(key, handlerExp)]
        };
    });
};

const transformShow = (dir, node, context) => {
    const { exp, loc } = dir;
    if (!exp) {
        context.onError(createDOMCompilerError(58 /* X_V_SHOW_NO_EXPRESSION */, loc));
    }
    return {
        props: [],
        needRuntime: context.helper(V_SHOW)
    };
};

const warnTransitionChildren = (node, context) => {
    if (node.type === 1 /* ELEMENT */ &&
        node.tagType === 1 /* COMPONENT */) {
        const component = context.isBuiltInComponent(node.tag);
        if (component === TRANSITION) {
            return () => {
                if (node.children.length && hasMultipleChildren(node)) {
                    context.onError(createDOMCompilerError(59 /* X_TRANSITION_INVALID_CHILDREN */, {
                        start: node.children[0].loc.start,
                        end: node.children[node.children.length - 1].loc.end,
                        source: ''
                    }));
                }
            };
        }
    }
};
function hasMultipleChildren(node) {
    // #1352 filter out potential comment nodes.
    const children = (node.children = node.children.filter(c => c.type !== 3 /* COMMENT */));
    const child = children[0];
    return (children.length !== 1 ||
        child.type === 11 /* FOR */ ||
        (child.type === 9 /* IF */ && child.branches.some(hasMultipleChildren)));
}

const ignoreSideEffectTags = (node, context) => {
    if (node.type === 1 /* ELEMENT */ &&
        node.tagType === 0 /* ELEMENT */ &&
        (node.tag === 'script' || node.tag === 'style')) {
        context.onError(createDOMCompilerError(60 /* X_IGNORED_SIDE_EFFECT_TAG */, node.loc));
        context.removeNode();
    }
};

const DOMNodeTransforms = [
    transformStyle,
    ...([warnTransitionChildren] )
];
const DOMDirectiveTransforms = {
    cloak: noopDirectiveTransform,
    html: transformVHtml,
    text: transformVText,
    model: transformModel$1,
    on: transformOn$1,
    show: transformShow
};
function compile(template, options = {}) {
    return baseCompile(template, extend({}, parserOptions, options, {
        nodeTransforms: [
            // ignore <script> and <tag>
            // this is not put inside DOMNodeTransforms because that list is used
            // by compiler-ssr to generate vnode fallback branches
            ignoreSideEffectTags,
            ...DOMNodeTransforms,
            ...(options.nodeTransforms || [])
        ],
        directiveTransforms: extend({}, DOMDirectiveTransforms, options.directiveTransforms || {}),
        transformHoist: null 
    }));
}
function parse(template, options = {}) {
    return baseParse(template, extend({}, parserOptions, options));
}

export { BASE_TRANSITION, CAMELIZE, CAPITALIZE, CREATE_BLOCK, CREATE_COMMENT, CREATE_ELEMENT_BLOCK, CREATE_ELEMENT_VNODE, CREATE_SLOTS, CREATE_STATIC, CREATE_TEXT, CREATE_VNODE, DOMDirectiveTransforms, DOMNodeTransforms, FRAGMENT, GUARD_REACTIVE_PROPS, IS_MEMO_SAME, IS_REF, KEEP_ALIVE, MERGE_PROPS, NORMALIZE_CLASS, NORMALIZE_PROPS, NORMALIZE_STYLE, OPEN_BLOCK, POP_SCOPE_ID, PUSH_SCOPE_ID, RENDER_LIST, RENDER_SLOT, RESOLVE_COMPONENT, RESOLVE_DIRECTIVE, RESOLVE_DYNAMIC_COMPONENT, RESOLVE_FILTER, SET_BLOCK_TRACKING, SUSPENSE, TELEPORT, TO_DISPLAY_STRING, TO_HANDLERS, TO_HANDLER_KEY, TRANSITION, TRANSITION_GROUP, UNREF, V_MODEL_CHECKBOX, V_MODEL_DYNAMIC, V_MODEL_RADIO, V_MODEL_SELECT, V_MODEL_TEXT, V_ON_WITH_KEYS, V_ON_WITH_MODIFIERS, V_SHOW, WITH_CTX, WITH_DIRECTIVES, WITH_MEMO, advancePositionWithClone, advancePositionWithMutation, assert, baseCompile, baseParse, buildProps, buildSlots, checkCompatEnabled, compile, createArrayExpression, createAssignmentExpression, createBlockStatement, createCacheExpression, createCallExpression, createCompilerError, createCompoundExpression, createConditionalExpression, createDOMCompilerError, createForLoopParams, createFunctionExpression, createIfStatement, createInterpolation, createObjectExpression, createObjectProperty, createReturnStatement, createRoot, createSequenceExpression, createSimpleExpression, createStructuralDirectiveTransform, createTemplateLiteral, createTransformContext, createVNodeCall, extractIdentifiers, findDir, findProp, generate, generateCodeFrame, getBaseTransformPreset, getInnerRange, getMemoedVNodeCall, getVNodeBlockHelper, getVNodeHelper, hasDynamicKeyVBind, hasScopeRef, helperNameMap, injectProp, isBindKey, isBuiltInType, isCoreComponent, isFunctionType, isInDestructureAssignment, isMemberExpression, isReferencedIdentifier, isSimpleIdentifier, isSlotOutlet, isStaticExp, isStaticProperty, isStaticPropertyKey, isTemplateNode, isText, isVSlot, locStub, makeBlock, noopDirectiveTransform, parse, parserOptions, processExpression, processFor, processIf, processSlotOutlet, registerRuntimeHelpers, resolveComponentType, toValidAssetId, trackSlotScopes, trackVForSlotScopes, transform, transformBind, transformElement, transformExpression, transformModel, transformOn, transformStyle, traverseNode, walkBlockDeclarations, walkFunctionParams, walkIdentifiers, warnDeprecation };