/** * @license * Copyright Google LLC All Rights Reserved. * * Use of this source code is governed by an MIT-style license that can be * found in the LICENSE file at https://angular.io/license */ (function (factory) { if (typeof module === "object" && typeof module.exports === "object") { var v = factory(require, exports); if (v !== undefined) module.exports = v; } else if (typeof define === "function" && define.amd) { define("@angular/compiler/src/ml_parser/parser", ["require", "exports", "tslib", "@angular/compiler/src/parse_util", "@angular/compiler/src/ml_parser/ast", "@angular/compiler/src/ml_parser/entities", "@angular/compiler/src/ml_parser/lexer", "@angular/compiler/src/ml_parser/tags"], factory); } })(function (require, exports) { "use strict"; Object.defineProperty(exports, "__esModule", { value: true }); exports.Parser = exports.ParseTreeResult = exports.TreeError = void 0; var tslib_1 = require("tslib"); var parse_util_1 = require("@angular/compiler/src/parse_util"); var html = require("@angular/compiler/src/ml_parser/ast"); var entities_1 = require("@angular/compiler/src/ml_parser/entities"); var lexer_1 = require("@angular/compiler/src/ml_parser/lexer"); var tags_1 = require("@angular/compiler/src/ml_parser/tags"); var TreeError = /** @class */ (function (_super) { tslib_1.__extends(TreeError, _super); function TreeError(elementName, span, msg) { var _this = _super.call(this, span, msg) || this; _this.elementName = elementName; return _this; } TreeError.create = function (elementName, span, msg) { return new TreeError(elementName, span, msg); }; return TreeError; }(parse_util_1.ParseError)); exports.TreeError = TreeError; var ParseTreeResult = /** @class */ (function () { function ParseTreeResult(rootNodes, errors) { this.rootNodes = rootNodes; this.errors = errors; } return ParseTreeResult; }()); exports.ParseTreeResult = ParseTreeResult; var Parser = /** @class */ (function () { function Parser(getTagDefinition) { this.getTagDefinition = getTagDefinition; } Parser.prototype.parse = function (source, url, options) { var tokenizeResult = lexer_1.tokenize(source, url, this.getTagDefinition, options); var parser = new _TreeBuilder(tokenizeResult.tokens, this.getTagDefinition); parser.build(); return new ParseTreeResult(parser.rootNodes, tokenizeResult.errors.concat(parser.errors)); }; return Parser; }()); exports.Parser = Parser; var _TreeBuilder = /** @class */ (function () { function _TreeBuilder(tokens, getTagDefinition) { this.tokens = tokens; this.getTagDefinition = getTagDefinition; this._index = -1; this._elementStack = []; this.rootNodes = []; this.errors = []; this._advance(); } _TreeBuilder.prototype.build = function () { while (this._peek.type !== 24 /* EOF */) { if (this._peek.type === 0 /* TAG_OPEN_START */ || this._peek.type === 4 /* INCOMPLETE_TAG_OPEN */) { this._consumeStartTag(this._advance()); } else if (this._peek.type === 3 /* TAG_CLOSE */) { this._consumeEndTag(this._advance()); } else if (this._peek.type === 12 /* CDATA_START */) { this._closeVoidElement(); this._consumeCdata(this._advance()); } else if (this._peek.type === 10 /* COMMENT_START */) { this._closeVoidElement(); this._consumeComment(this._advance()); } else if (this._peek.type === 5 /* TEXT */ || this._peek.type === 7 /* RAW_TEXT */ || this._peek.type === 6 /* ESCAPABLE_RAW_TEXT */) { this._closeVoidElement(); this._consumeText(this._advance()); } else if (this._peek.type === 19 /* EXPANSION_FORM_START */) { this._consumeExpansion(this._advance()); } else { // Skip all other tokens... this._advance(); } } }; _TreeBuilder.prototype._advance = function () { var prev = this._peek; if (this._index < this.tokens.length - 1) { // Note: there is always an EOF token at the end this._index++; } this._peek = this.tokens[this._index]; return prev; }; _TreeBuilder.prototype._advanceIf = function (type) { if (this._peek.type === type) { return this._advance(); } return null; }; _TreeBuilder.prototype._consumeCdata = function (_startToken) { this._consumeText(this._advance()); this._advanceIf(13 /* CDATA_END */); }; _TreeBuilder.prototype._consumeComment = function (token) { var text = this._advanceIf(7 /* RAW_TEXT */); this._advanceIf(11 /* COMMENT_END */); var value = text != null ? text.parts[0].trim() : null; this._addToParent(new html.Comment(value, token.sourceSpan)); }; _TreeBuilder.prototype._consumeExpansion = function (token) { var switchValue = this._advance(); var type = this._advance(); var cases = []; // read = while (this._peek.type === 20 /* EXPANSION_CASE_VALUE */) { var expCase = this._parseExpansionCase(); if (!expCase) return; // error cases.push(expCase); } // read the final } if (this._peek.type !== 23 /* EXPANSION_FORM_END */) { this.errors.push(TreeError.create(null, this._peek.sourceSpan, "Invalid ICU message. Missing '}'.")); return; } var sourceSpan = new parse_util_1.ParseSourceSpan(token.sourceSpan.start, this._peek.sourceSpan.end, token.sourceSpan.fullStart); this._addToParent(new html.Expansion(switchValue.parts[0], type.parts[0], cases, sourceSpan, switchValue.sourceSpan)); this._advance(); }; _TreeBuilder.prototype._parseExpansionCase = function () { var value = this._advance(); // read { if (this._peek.type !== 21 /* EXPANSION_CASE_EXP_START */) { this.errors.push(TreeError.create(null, this._peek.sourceSpan, "Invalid ICU message. Missing '{'.")); return null; } // read until } var start = this._advance(); var exp = this._collectExpansionExpTokens(start); if (!exp) return null; var end = this._advance(); exp.push({ type: 24 /* EOF */, parts: [], sourceSpan: end.sourceSpan }); // parse everything in between { and } var expansionCaseParser = new _TreeBuilder(exp, this.getTagDefinition); expansionCaseParser.build(); if (expansionCaseParser.errors.length > 0) { this.errors = this.errors.concat(expansionCaseParser.errors); return null; } var sourceSpan = new parse_util_1.ParseSourceSpan(value.sourceSpan.start, end.sourceSpan.end, value.sourceSpan.fullStart); var expSourceSpan = new parse_util_1.ParseSourceSpan(start.sourceSpan.start, end.sourceSpan.end, start.sourceSpan.fullStart); return new html.ExpansionCase(value.parts[0], expansionCaseParser.rootNodes, sourceSpan, value.sourceSpan, expSourceSpan); }; _TreeBuilder.prototype._collectExpansionExpTokens = function (start) { var exp = []; var expansionFormStack = [21 /* EXPANSION_CASE_EXP_START */]; while (true) { if (this._peek.type === 19 /* EXPANSION_FORM_START */ || this._peek.type === 21 /* EXPANSION_CASE_EXP_START */) { expansionFormStack.push(this._peek.type); } if (this._peek.type === 22 /* EXPANSION_CASE_EXP_END */) { if (lastOnStack(expansionFormStack, 21 /* EXPANSION_CASE_EXP_START */)) { expansionFormStack.pop(); if (expansionFormStack.length === 0) return exp; } else { this.errors.push(TreeError.create(null, start.sourceSpan, "Invalid ICU message. Missing '}'.")); return null; } } if (this._peek.type === 23 /* EXPANSION_FORM_END */) { if (lastOnStack(expansionFormStack, 19 /* EXPANSION_FORM_START */)) { expansionFormStack.pop(); } else { this.errors.push(TreeError.create(null, start.sourceSpan, "Invalid ICU message. Missing '}'.")); return null; } } if (this._peek.type === 24 /* EOF */) { this.errors.push(TreeError.create(null, start.sourceSpan, "Invalid ICU message. Missing '}'.")); return null; } exp.push(this._advance()); } }; _TreeBuilder.prototype._consumeText = function (token) { var tokens = [token]; var startSpan = token.sourceSpan; var text = token.parts[0]; if (text.length > 0 && text[0] === '\n') { var parent_1 = this._getParentElement(); if (parent_1 != null && parent_1.children.length === 0 && this.getTagDefinition(parent_1.name).ignoreFirstLf) { text = text.substring(1); tokens[0] = { type: token.type, sourceSpan: token.sourceSpan, parts: [text] }; } } while (this._peek.type === 8 /* INTERPOLATION */ || this._peek.type === 5 /* TEXT */ || this._peek.type === 9 /* ENCODED_ENTITY */) { token = this._advance(); tokens.push(token); if (token.type === 8 /* INTERPOLATION */) { // For backward compatibility we decode HTML entities that appear in interpolation // expressions. This is arguably a bug, but it could be a considerable breaking change to // fix it. It should be addressed in a larger project to refactor the entire parser/lexer // chain after View Engine has been removed. text += token.parts.join('').replace(/&([^;]+);/g, decodeEntity); } else if (token.type === 9 /* ENCODED_ENTITY */) { text += token.parts[0]; } else { text += token.parts.join(''); } } if (text.length > 0) { var endSpan = token.sourceSpan; this._addToParent(new html.Text(text, new parse_util_1.ParseSourceSpan(startSpan.start, endSpan.end, startSpan.fullStart, startSpan.details), tokens)); } }; _TreeBuilder.prototype._closeVoidElement = function () { var el = this._getParentElement(); if (el && this.getTagDefinition(el.name).isVoid) { this._elementStack.pop(); } }; _TreeBuilder.prototype._consumeStartTag = function (startTagToken) { var _a = tslib_1.__read(startTagToken.parts, 2), prefix = _a[0], name = _a[1]; var attrs = []; while (this._peek.type === 14 /* ATTR_NAME */) { attrs.push(this._consumeAttr(this._advance())); } var fullName = this._getElementFullName(prefix, name, this._getParentElement()); var selfClosing = false; // Note: There could have been a tokenizer error // so that we don't get a token for the end tag... if (this._peek.type === 2 /* TAG_OPEN_END_VOID */) { this._advance(); selfClosing = true; var tagDef = this.getTagDefinition(fullName); if (!(tagDef.canSelfClose || tags_1.getNsPrefix(fullName) !== null || tagDef.isVoid)) { this.errors.push(TreeError.create(fullName, startTagToken.sourceSpan, "Only void and foreign elements can be self closed \"" + startTagToken.parts[1] + "\"")); } } else if (this._peek.type === 1 /* TAG_OPEN_END */) { this._advance(); selfClosing = false; } var end = this._peek.sourceSpan.fullStart; var span = new parse_util_1.ParseSourceSpan(startTagToken.sourceSpan.start, end, startTagToken.sourceSpan.fullStart); // Create a separate `startSpan` because `span` will be modified when there is an `end` span. var startSpan = new parse_util_1.ParseSourceSpan(startTagToken.sourceSpan.start, end, startTagToken.sourceSpan.fullStart); var el = new html.Element(fullName, attrs, [], span, startSpan, undefined); this._pushElement(el); if (selfClosing) { // Elements that are self-closed have their `endSourceSpan` set to the full span, as the // element start tag also represents the end tag. this._popElement(fullName, span); } else if (startTagToken.type === 4 /* INCOMPLETE_TAG_OPEN */) { // We already know the opening tag is not complete, so it is unlikely it has a corresponding // close tag. Let's optimistically parse it as a full element and emit an error. this._popElement(fullName, null); this.errors.push(TreeError.create(fullName, span, "Opening tag \"" + fullName + "\" not terminated.")); } }; _TreeBuilder.prototype._pushElement = function (el) { var parentEl = this._getParentElement(); if (parentEl && this.getTagDefinition(parentEl.name).isClosedByChild(el.name)) { this._elementStack.pop(); } this._addToParent(el); this._elementStack.push(el); }; _TreeBuilder.prototype._consumeEndTag = function (endTagToken) { var fullName = this._getElementFullName(endTagToken.parts[0], endTagToken.parts[1], this._getParentElement()); if (this.getTagDefinition(fullName).isVoid) { this.errors.push(TreeError.create(fullName, endTagToken.sourceSpan, "Void elements do not have end tags \"" + endTagToken.parts[1] + "\"")); } else if (!this._popElement(fullName, endTagToken.sourceSpan)) { var errMsg = "Unexpected closing tag \"" + fullName + "\". It may happen when the tag has already been closed by another tag. For more info see https://www.w3.org/TR/html5/syntax.html#closing-elements-that-have-implied-end-tags"; this.errors.push(TreeError.create(fullName, endTagToken.sourceSpan, errMsg)); } }; /** * Closes the nearest element with the tag name `fullName` in the parse tree. * `endSourceSpan` is the span of the closing tag, or null if the element does * not have a closing tag (for example, this happens when an incomplete * opening tag is recovered). */ _TreeBuilder.prototype._popElement = function (fullName, endSourceSpan) { var unexpectedCloseTagDetected = false; for (var stackIndex = this._elementStack.length - 1; stackIndex >= 0; stackIndex--) { var el = this._elementStack[stackIndex]; if (el.name === fullName) { // Record the parse span with the element that is being closed. Any elements that are // removed from the element stack at this point are closed implicitly, so they won't get // an end source span (as there is no explicit closing element). el.endSourceSpan = endSourceSpan; el.sourceSpan.end = endSourceSpan !== null ? endSourceSpan.end : el.sourceSpan.end; this._elementStack.splice(stackIndex, this._elementStack.length - stackIndex); return !unexpectedCloseTagDetected; } if (!this.getTagDefinition(el.name).closedByParent) { // Note that we encountered an unexpected close tag but continue processing the element // stack so we can assign an `endSourceSpan` if there is a corresponding start tag for this // end tag in the stack. unexpectedCloseTagDetected = true; } } return false; }; _TreeBuilder.prototype._consumeAttr = function (attrName) { var fullName = tags_1.mergeNsAndName(attrName.parts[0], attrName.parts[1]); var attrEnd = attrName.sourceSpan.end; // Consume any quote if (this._peek.type === 15 /* ATTR_QUOTE */) { this._advance(); } // Consume the attribute value var value = ''; var valueTokens = []; var valueStartSpan = undefined; var valueEnd = undefined; // NOTE: We need to use a new variable `nextTokenType` here to hide the actual type of // `_peek.type` from TS. Otherwise TS will narrow the type of `_peek.type` preventing it from // being able to consider `ATTR_VALUE_INTERPOLATION` as an option. This is because TS is not // able to see that `_advance()` will actually mutate `_peek`. var nextTokenType = this._peek.type; if (nextTokenType === 16 /* ATTR_VALUE_TEXT */) { valueStartSpan = this._peek.sourceSpan; valueEnd = this._peek.sourceSpan.end; while (this._peek.type === 16 /* ATTR_VALUE_TEXT */ || this._peek.type === 17 /* ATTR_VALUE_INTERPOLATION */ || this._peek.type === 9 /* ENCODED_ENTITY */) { var valueToken = this._advance(); valueTokens.push(valueToken); if (valueToken.type === 17 /* ATTR_VALUE_INTERPOLATION */) { // For backward compatibility we decode HTML entities that appear in interpolation // expressions. This is arguably a bug, but it could be a considerable breaking change to // fix it. It should be addressed in a larger project to refactor the entire parser/lexer // chain after View Engine has been removed. value += valueToken.parts.join('').replace(/&([^;]+);/g, decodeEntity); } else if (valueToken.type === 9 /* ENCODED_ENTITY */) { value += valueToken.parts[0]; } else { value += valueToken.parts.join(''); } valueEnd = attrEnd = valueToken.sourceSpan.end; } } // Consume any quote if (this._peek.type === 15 /* ATTR_QUOTE */) { var quoteToken = this._advance(); attrEnd = quoteToken.sourceSpan.end; } var valueSpan = valueStartSpan && valueEnd && new parse_util_1.ParseSourceSpan(valueStartSpan.start, valueEnd, valueStartSpan.fullStart); return new html.Attribute(fullName, value, new parse_util_1.ParseSourceSpan(attrName.sourceSpan.start, attrEnd, attrName.sourceSpan.fullStart), attrName.sourceSpan, valueSpan, valueTokens.length > 0 ? valueTokens : undefined, undefined); }; _TreeBuilder.prototype._getParentElement = function () { return this._elementStack.length > 0 ? this._elementStack[this._elementStack.length - 1] : null; }; _TreeBuilder.prototype._addToParent = function (node) { var parent = this._getParentElement(); if (parent != null) { parent.children.push(node); } else { this.rootNodes.push(node); } }; _TreeBuilder.prototype._getElementFullName = function (prefix, localName, parentElement) { if (prefix === '') { prefix = this.getTagDefinition(localName).implicitNamespacePrefix || ''; if (prefix === '' && parentElement != null) { var parentTagName = tags_1.splitNsName(parentElement.name)[1]; var parentTagDefinition = this.getTagDefinition(parentTagName); if (!parentTagDefinition.preventNamespaceInheritance) { prefix = tags_1.getNsPrefix(parentElement.name); } } } return tags_1.mergeNsAndName(prefix, localName); }; return _TreeBuilder; }()); function lastOnStack(stack, element) { return stack.length > 0 && stack[stack.length - 1] === element; } /** * Decode the `entity` string, which we believe is the contents of an HTML entity. * * If the string is not actually a valid/known entity then just return the original `match` string. */ function decodeEntity(match, entity) { if (entities_1.NAMED_ENTITIES[entity] !== undefined) { return entities_1.NAMED_ENTITIES[entity] || match; } if (/^#x[a-f0-9]+$/i.test(entity)) { return String.fromCodePoint(parseInt(entity.slice(2), 16)); } if (/^#\d+$/.test(entity)) { return String.fromCodePoint(parseInt(entity.slice(1), 10)); } return match; } }); //# 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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {ParseError, ParseLocation, ParseSourceSpan} from '../parse_util';\n\nimport * as html from './ast';\nimport {NAMED_ENTITIES} from './entities';\nimport {tokenize, TokenizeOptions} from './lexer';\nimport {getNsPrefix, mergeNsAndName, splitNsName, TagDefinition} from './tags';\nimport {AttributeNameToken, AttributeQuoteToken, CdataStartToken, CommentStartToken, ExpansionCaseExpressionEndToken, ExpansionCaseExpressionStartToken, ExpansionCaseValueToken, ExpansionFormStartToken, IncompleteTagOpenToken, InterpolatedAttributeToken, InterpolatedTextToken, TagCloseToken, TagOpenStartToken, TextToken, Token, TokenType} from './tokens';\n\nexport class TreeError extends ParseError {\n  static create(elementName: string|null, span: ParseSourceSpan, msg: string): TreeError {\n    return new TreeError(elementName, span, msg);\n  }\n\n  constructor(public elementName: string|null, span: ParseSourceSpan, msg: string) {\n    super(span, msg);\n  }\n}\n\nexport class ParseTreeResult {\n  constructor(public rootNodes: html.Node[], public errors: ParseError[]) {}\n}\n\nexport class Parser {\n  constructor(public getTagDefinition: (tagName: string) => TagDefinition) {}\n\n  parse(source: string, url: string, options?: TokenizeOptions): ParseTreeResult {\n    const tokenizeResult = tokenize(source, url, this.getTagDefinition, options);\n    const parser = new _TreeBuilder(tokenizeResult.tokens, this.getTagDefinition);\n    parser.build();\n    return new ParseTreeResult(\n        parser.rootNodes,\n        (tokenizeResult.errors as ParseError[]).concat(parser.errors),\n    );\n  }\n}\n\nclass _TreeBuilder {\n  private _index: number = -1;\n  // `_peek` will be initialized by the call to `_advance()` in the constructor.\n  private _peek!: Token;\n  private _elementStack: html.Element[] = [];\n\n  rootNodes: html.Node[] = [];\n  errors: TreeError[] = [];\n\n  constructor(\n      private tokens: Token[], private getTagDefinition: (tagName: string) => TagDefinition) {\n    this._advance();\n  }\n\n  build(): void {\n    while (this._peek.type !== TokenType.EOF) {\n      if (this._peek.type === TokenType.TAG_OPEN_START ||\n          this._peek.type === TokenType.INCOMPLETE_TAG_OPEN) {\n        this._consumeStartTag(this._advance<TagOpenStartToken|IncompleteTagOpenToken>());\n      } else if (this._peek.type === TokenType.TAG_CLOSE) {\n        this._consumeEndTag(this._advance<TagCloseToken>());\n      } else if (this._peek.type === TokenType.CDATA_START) {\n        this._closeVoidElement();\n        this._consumeCdata(this._advance<CdataStartToken>());\n      } else if (this._peek.type === TokenType.COMMENT_START) {\n        this._closeVoidElement();\n        this._consumeComment(this._advance<CommentStartToken>());\n      } else if (\n          this._peek.type === TokenType.TEXT || this._peek.type === TokenType.RAW_TEXT ||\n          this._peek.type === TokenType.ESCAPABLE_RAW_TEXT) {\n        this._closeVoidElement();\n        this._consumeText(this._advance<TextToken>());\n      } else if (this._peek.type === TokenType.EXPANSION_FORM_START) {\n        this._consumeExpansion(this._advance<ExpansionFormStartToken>());\n      } else {\n        // Skip all other tokens...\n        this._advance();\n      }\n    }\n  }\n\n  private _advance<T extends Token>(): T {\n    const prev = this._peek;\n    if (this._index < this.tokens.length - 1) {\n      // Note: there is always an EOF token at the end\n      this._index++;\n    }\n    this._peek = this.tokens[this._index];\n    return prev as T;\n  }\n\n  private _advanceIf<T extends TokenType>(type: T): (Token&{type: T})|null {\n    if (this._peek.type === type) {\n      return this._advance<Token&{type: T}>();\n    }\n    return null;\n  }\n\n  private _consumeCdata(_startToken: CdataStartToken) {\n    this._consumeText(this._advance<TextToken>());\n    this._advanceIf(TokenType.CDATA_END);\n  }\n\n  private _consumeComment(token: CommentStartToken) {\n    const text = this._advanceIf(TokenType.RAW_TEXT);\n    this._advanceIf(TokenType.COMMENT_END);\n    const value = text != null ? text.parts[0].trim() : null;\n    this._addToParent(new html.Comment(value, token.sourceSpan));\n  }\n\n  private _consumeExpansion(token: ExpansionFormStartToken) {\n    const switchValue = this._advance<TextToken>();\n\n    const type = this._advance<TextToken>();\n    const cases: html.ExpansionCase[] = [];\n\n    // read =\n    while (this._peek.type === TokenType.EXPANSION_CASE_VALUE) {\n      const expCase = this._parseExpansionCase();\n      if (!expCase) return;  // error\n      cases.push(expCase);\n    }\n\n    // read the final }\n    if (this._peek.type !== TokenType.EXPANSION_FORM_END) {\n      this.errors.push(\n          TreeError.create(null, this._peek.sourceSpan, `Invalid ICU message. Missing '}'.`));\n      return;\n    }\n    const sourceSpan = new ParseSourceSpan(\n        token.sourceSpan.start, this._peek.sourceSpan.end, token.sourceSpan.fullStart);\n    this._addToParent(new html.Expansion(\n        switchValue.parts[0], type.parts[0], cases, sourceSpan, switchValue.sourceSpan));\n\n    this._advance();\n  }\n\n  private _parseExpansionCase(): html.ExpansionCase|null {\n    const value = this._advance<ExpansionCaseValueToken>();\n\n    // read {\n    if (this._peek.type !== TokenType.EXPANSION_CASE_EXP_START) {\n      this.errors.push(\n          TreeError.create(null, this._peek.sourceSpan, `Invalid ICU message. Missing '{'.`));\n      return null;\n    }\n\n    // read until }\n    const start = this._advance<ExpansionCaseExpressionStartToken>();\n\n    const exp = this._collectExpansionExpTokens(start);\n    if (!exp) return null;\n\n    const end = this._advance<ExpansionCaseExpressionEndToken>();\n    exp.push({type: TokenType.EOF, parts: [], sourceSpan: end.sourceSpan});\n\n    // parse everything in between { and }\n    const expansionCaseParser = new _TreeBuilder(exp, this.getTagDefinition);\n    expansionCaseParser.build();\n    if (expansionCaseParser.errors.length > 0) {\n      this.errors = this.errors.concat(expansionCaseParser.errors);\n      return null;\n    }\n\n    const sourceSpan =\n        new ParseSourceSpan(value.sourceSpan.start, end.sourceSpan.end, value.sourceSpan.fullStart);\n    const expSourceSpan =\n        new ParseSourceSpan(start.sourceSpan.start, end.sourceSpan.end, start.sourceSpan.fullStart);\n    return new html.ExpansionCase(\n        value.parts[0], expansionCaseParser.rootNodes, sourceSpan, value.sourceSpan, expSourceSpan);\n  }\n\n  private _collectExpansionExpTokens(start: Token): Token[]|null {\n    const exp: Token[] = [];\n    const expansionFormStack = [TokenType.EXPANSION_CASE_EXP_START];\n\n    while (true) {\n      if (this._peek.type === TokenType.EXPANSION_FORM_START ||\n          this._peek.type === TokenType.EXPANSION_CASE_EXP_START) {\n        expansionFormStack.push(this._peek.type);\n      }\n\n      if (this._peek.type === TokenType.EXPANSION_CASE_EXP_END) {\n        if (lastOnStack(expansionFormStack, TokenType.EXPANSION_CASE_EXP_START)) {\n          expansionFormStack.pop();\n          if (expansionFormStack.length === 0) return exp;\n\n        } else {\n          this.errors.push(\n              TreeError.create(null, start.sourceSpan, `Invalid ICU message. Missing '}'.`));\n          return null;\n        }\n      }\n\n      if (this._peek.type === TokenType.EXPANSION_FORM_END) {\n        if (lastOnStack(expansionFormStack, TokenType.EXPANSION_FORM_START)) {\n          expansionFormStack.pop();\n        } else {\n          this.errors.push(\n              TreeError.create(null, start.sourceSpan, `Invalid ICU message. Missing '}'.`));\n          return null;\n        }\n      }\n\n      if (this._peek.type === TokenType.EOF) {\n        this.errors.push(\n            TreeError.create(null, start.sourceSpan, `Invalid ICU message. Missing '}'.`));\n        return null;\n      }\n\n      exp.push(this._advance());\n    }\n  }\n\n  private _consumeText(token: InterpolatedTextToken) {\n    const tokens = [token];\n    const startSpan = token.sourceSpan;\n    let text = token.parts[0];\n    if (text.length > 0 && text[0] === '\\n') {\n      const parent = this._getParentElement();\n      if (parent != null && parent.children.length === 0 &&\n          this.getTagDefinition(parent.name).ignoreFirstLf) {\n        text = text.substring(1);\n        tokens[0] = {type: token.type, sourceSpan: token.sourceSpan, parts: [text]} as typeof token;\n      }\n    }\n\n    while (this._peek.type === TokenType.INTERPOLATION || this._peek.type === TokenType.TEXT ||\n           this._peek.type === TokenType.ENCODED_ENTITY) {\n      token = this._advance();\n      tokens.push(token);\n      if (token.type === TokenType.INTERPOLATION) {\n        // For backward compatibility we decode HTML entities that appear in interpolation\n        // expressions. This is arguably a bug, but it could be a considerable breaking change to\n        // fix it. It should be addressed in a larger project to refactor the entire parser/lexer\n        // chain after View Engine has been removed.\n        text += token.parts.join('').replace(/&([^;]+);/g, decodeEntity);\n      } else if (token.type === TokenType.ENCODED_ENTITY) {\n        text += token.parts[0];\n      } else {\n        text += token.parts.join('');\n      }\n    }\n\n    if (text.length > 0) {\n      const endSpan = token.sourceSpan;\n      this._addToParent(new html.Text(\n          text,\n          new ParseSourceSpan(startSpan.start, endSpan.end, startSpan.fullStart, startSpan.details),\n          tokens));\n    }\n  }\n\n  private _closeVoidElement(): void {\n    const el = this._getParentElement();\n    if (el && this.getTagDefinition(el.name).isVoid) {\n      this._elementStack.pop();\n    }\n  }\n\n  private _consumeStartTag(startTagToken: TagOpenStartToken|IncompleteTagOpenToken) {\n    const [prefix, name] = startTagToken.parts;\n    const attrs: html.Attribute[] = [];\n    while (this._peek.type === TokenType.ATTR_NAME) {\n      attrs.push(this._consumeAttr(this._advance<AttributeNameToken>()));\n    }\n    const fullName = this._getElementFullName(prefix, name, this._getParentElement());\n    let selfClosing = false;\n    // Note: There could have been a tokenizer error\n    // so that we don't get a token for the end tag...\n    if (this._peek.type === TokenType.TAG_OPEN_END_VOID) {\n      this._advance();\n      selfClosing = true;\n      const tagDef = this.getTagDefinition(fullName);\n      if (!(tagDef.canSelfClose || getNsPrefix(fullName) !== null || tagDef.isVoid)) {\n        this.errors.push(TreeError.create(\n            fullName, startTagToken.sourceSpan,\n            `Only void and foreign elements can be self closed \"${startTagToken.parts[1]}\"`));\n      }\n    } else if (this._peek.type === TokenType.TAG_OPEN_END) {\n      this._advance();\n      selfClosing = false;\n    }\n    const end = this._peek.sourceSpan.fullStart;\n    const span = new ParseSourceSpan(\n        startTagToken.sourceSpan.start, end, startTagToken.sourceSpan.fullStart);\n    // Create a separate `startSpan` because `span` will be modified when there is an `end` span.\n    const startSpan = new ParseSourceSpan(\n        startTagToken.sourceSpan.start, end, startTagToken.sourceSpan.fullStart);\n    const el = new html.Element(fullName, attrs, [], span, startSpan, undefined);\n    this._pushElement(el);\n    if (selfClosing) {\n      // Elements that are self-closed have their `endSourceSpan` set to the full span, as the\n      // element start tag also represents the end tag.\n      this._popElement(fullName, span);\n    } else if (startTagToken.type === TokenType.INCOMPLETE_TAG_OPEN) {\n      // We already know the opening tag is not complete, so it is unlikely it has a corresponding\n      // close tag. Let's optimistically parse it as a full element and emit an error.\n      this._popElement(fullName, null);\n      this.errors.push(\n          TreeError.create(fullName, span, `Opening tag \"${fullName}\" not terminated.`));\n    }\n  }\n\n  private _pushElement(el: html.Element) {\n    const parentEl = this._getParentElement();\n\n    if (parentEl && this.getTagDefinition(parentEl.name).isClosedByChild(el.name)) {\n      this._elementStack.pop();\n    }\n\n    this._addToParent(el);\n    this._elementStack.push(el);\n  }\n\n  private _consumeEndTag(endTagToken: TagCloseToken) {\n    const fullName = this._getElementFullName(\n        endTagToken.parts[0], endTagToken.parts[1], this._getParentElement());\n\n    if (this.getTagDefinition(fullName).isVoid) {\n      this.errors.push(TreeError.create(\n          fullName, endTagToken.sourceSpan,\n          `Void elements do not have end tags \"${endTagToken.parts[1]}\"`));\n    } else if (!this._popElement(fullName, endTagToken.sourceSpan)) {\n      const errMsg = `Unexpected closing tag \"${\n          fullName}\". It may happen when the tag has already been closed by another tag. For more info see https://www.w3.org/TR/html5/syntax.html#closing-elements-that-have-implied-end-tags`;\n      this.errors.push(TreeError.create(fullName, endTagToken.sourceSpan, errMsg));\n    }\n  }\n\n  /**\n   * Closes the nearest element with the tag name `fullName` in the parse tree.\n   * `endSourceSpan` is the span of the closing tag, or null if the element does\n   * not have a closing tag (for example, this happens when an incomplete\n   * opening tag is recovered).\n   */\n  private _popElement(fullName: string, endSourceSpan: ParseSourceSpan|null): boolean {\n    let unexpectedCloseTagDetected = false;\n    for (let stackIndex = this._elementStack.length - 1; stackIndex >= 0; stackIndex--) {\n      const el = this._elementStack[stackIndex];\n      if (el.name === fullName) {\n        // Record the parse span with the element that is being closed. Any elements that are\n        // removed from the element stack at this point are closed implicitly, so they won't get\n        // an end source span (as there is no explicit closing element).\n        el.endSourceSpan = endSourceSpan;\n        el.sourceSpan.end = endSourceSpan !== null ? endSourceSpan.end : el.sourceSpan.end;\n\n        this._elementStack.splice(stackIndex, this._elementStack.length - stackIndex);\n        return !unexpectedCloseTagDetected;\n      }\n\n      if (!this.getTagDefinition(el.name).closedByParent) {\n        // Note that we encountered an unexpected close tag but continue processing the element\n        // stack so we can assign an `endSourceSpan` if there is a corresponding start tag for this\n        // end tag in the stack.\n        unexpectedCloseTagDetected = true;\n      }\n    }\n    return false;\n  }\n\n  private _consumeAttr(attrName: AttributeNameToken): html.Attribute {\n    const fullName = mergeNsAndName(attrName.parts[0], attrName.parts[1]);\n    let attrEnd = attrName.sourceSpan.end;\n\n    // Consume any quote\n    if (this._peek.type === TokenType.ATTR_QUOTE) {\n      this._advance();\n    }\n\n    // Consume the attribute value\n    let value = '';\n    const valueTokens: InterpolatedAttributeToken[] = [];\n    let valueStartSpan: ParseSourceSpan|undefined = undefined;\n    let valueEnd: ParseLocation|undefined = undefined;\n    // NOTE: We need to use a new variable `nextTokenType` here to hide the actual type of\n    // `_peek.type` from TS. Otherwise TS will narrow the type of `_peek.type` preventing it from\n    // being able to consider `ATTR_VALUE_INTERPOLATION` as an option. This is because TS is not\n    // able to see that `_advance()` will actually mutate `_peek`.\n    const nextTokenType = this._peek.type;\n    if (nextTokenType === TokenType.ATTR_VALUE_TEXT) {\n      valueStartSpan = this._peek.sourceSpan;\n      valueEnd = this._peek.sourceSpan.end;\n      while (this._peek.type === TokenType.ATTR_VALUE_TEXT ||\n             this._peek.type === TokenType.ATTR_VALUE_INTERPOLATION ||\n             this._peek.type === TokenType.ENCODED_ENTITY) {\n        const valueToken = this._advance<InterpolatedAttributeToken>();\n        valueTokens.push(valueToken);\n        if (valueToken.type === TokenType.ATTR_VALUE_INTERPOLATION) {\n          // For backward compatibility we decode HTML entities that appear in interpolation\n          // expressions. This is arguably a bug, but it could be a considerable breaking change to\n          // fix it. It should be addressed in a larger project to refactor the entire parser/lexer\n          // chain after View Engine has been removed.\n          value += valueToken.parts.join('').replace(/&([^;]+);/g, decodeEntity);\n        } else if (valueToken.type === TokenType.ENCODED_ENTITY) {\n          value += valueToken.parts[0];\n        } else {\n          value += valueToken.parts.join('');\n        }\n        valueEnd = attrEnd = valueToken.sourceSpan.end;\n      }\n    }\n\n    // Consume any quote\n    if (this._peek.type === TokenType.ATTR_QUOTE) {\n      const quoteToken = this._advance<AttributeQuoteToken>();\n      attrEnd = quoteToken.sourceSpan.end;\n    }\n\n    const valueSpan = valueStartSpan && valueEnd &&\n        new ParseSourceSpan(valueStartSpan.start, valueEnd, valueStartSpan.fullStart);\n    return new html.Attribute(\n        fullName, value,\n        new ParseSourceSpan(attrName.sourceSpan.start, attrEnd, attrName.sourceSpan.fullStart),\n        attrName.sourceSpan, valueSpan, valueTokens.length > 0 ? valueTokens : undefined,\n        undefined);\n  }\n\n  private _getParentElement(): html.Element|null {\n    return this._elementStack.length > 0 ? this._elementStack[this._elementStack.length - 1] : null;\n  }\n\n  private _addToParent(node: html.Node) {\n    const parent = this._getParentElement();\n    if (parent != null) {\n      parent.children.push(node);\n    } else {\n      this.rootNodes.push(node);\n    }\n  }\n\n  private _getElementFullName(prefix: string, localName: string, parentElement: html.Element|null):\n      string {\n    if (prefix === '') {\n      prefix = this.getTagDefinition(localName).implicitNamespacePrefix || '';\n      if (prefix === '' && parentElement != null) {\n        const parentTagName = splitNsName(parentElement.name)[1];\n        const parentTagDefinition = this.getTagDefinition(parentTagName);\n        if (!parentTagDefinition.preventNamespaceInheritance) {\n          prefix = getNsPrefix(parentElement.name);\n        }\n      }\n    }\n\n    return mergeNsAndName(prefix, localName);\n  }\n}\n\nfunction lastOnStack(stack: any[], element: any): boolean {\n  return stack.length > 0 && stack[stack.length - 1] === element;\n}\n\n/**\n * Decode the `entity` string, which we believe is the contents of an HTML entity.\n *\n * If the string is not actually a valid/known entity then just return the original `match` string.\n */\nfunction decodeEntity(match: string, entity: string): string {\n  if (NAMED_ENTITIES[entity] !== undefined) {\n    return NAMED_ENTITIES[entity] || match;\n  }\n  if (/^#x[a-f0-9]+$/i.test(entity)) {\n    return String.fromCodePoint(parseInt(entity.slice(2), 16));\n  }\n  if (/^#\\d+$/.test(entity)) {\n    return String.fromCodePoint(parseInt(entity.slice(1), 10));\n  }\n  return match;\n}\n"]}