source: trip-planner-front/node_modules/@angular/compiler/src/ml_parser/parser.js@ 6a3a178

Last change on this file since 6a3a178 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

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1/**
2 * @license
3 * Copyright Google LLC All Rights Reserved.
4 *
5 * Use of this source code is governed by an MIT-style license that can be
6 * found in the LICENSE file at https://angular.io/license
7 */
8(function (factory) {
9 if (typeof module === "object" && typeof module.exports === "object") {
10 var v = factory(require, exports);
11 if (v !== undefined) module.exports = v;
12 }
13 else if (typeof define === "function" && define.amd) {
14 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);
15 }
16})(function (require, exports) {
17 "use strict";
18 Object.defineProperty(exports, "__esModule", { value: true });
19 exports.Parser = exports.ParseTreeResult = exports.TreeError = void 0;
20 var tslib_1 = require("tslib");
21 var parse_util_1 = require("@angular/compiler/src/parse_util");
22 var html = require("@angular/compiler/src/ml_parser/ast");
23 var entities_1 = require("@angular/compiler/src/ml_parser/entities");
24 var lexer_1 = require("@angular/compiler/src/ml_parser/lexer");
25 var tags_1 = require("@angular/compiler/src/ml_parser/tags");
26 var TreeError = /** @class */ (function (_super) {
27 tslib_1.__extends(TreeError, _super);
28 function TreeError(elementName, span, msg) {
29 var _this = _super.call(this, span, msg) || this;
30 _this.elementName = elementName;
31 return _this;
32 }
33 TreeError.create = function (elementName, span, msg) {
34 return new TreeError(elementName, span, msg);
35 };
36 return TreeError;
37 }(parse_util_1.ParseError));
38 exports.TreeError = TreeError;
39 var ParseTreeResult = /** @class */ (function () {
40 function ParseTreeResult(rootNodes, errors) {
41 this.rootNodes = rootNodes;
42 this.errors = errors;
43 }
44 return ParseTreeResult;
45 }());
46 exports.ParseTreeResult = ParseTreeResult;
47 var Parser = /** @class */ (function () {
48 function Parser(getTagDefinition) {
49 this.getTagDefinition = getTagDefinition;
50 }
51 Parser.prototype.parse = function (source, url, options) {
52 var tokenizeResult = lexer_1.tokenize(source, url, this.getTagDefinition, options);
53 var parser = new _TreeBuilder(tokenizeResult.tokens, this.getTagDefinition);
54 parser.build();
55 return new ParseTreeResult(parser.rootNodes, tokenizeResult.errors.concat(parser.errors));
56 };
57 return Parser;
58 }());
59 exports.Parser = Parser;
60 var _TreeBuilder = /** @class */ (function () {
61 function _TreeBuilder(tokens, getTagDefinition) {
62 this.tokens = tokens;
63 this.getTagDefinition = getTagDefinition;
64 this._index = -1;
65 this._elementStack = [];
66 this.rootNodes = [];
67 this.errors = [];
68 this._advance();
69 }
70 _TreeBuilder.prototype.build = function () {
71 while (this._peek.type !== 24 /* EOF */) {
72 if (this._peek.type === 0 /* TAG_OPEN_START */ ||
73 this._peek.type === 4 /* INCOMPLETE_TAG_OPEN */) {
74 this._consumeStartTag(this._advance());
75 }
76 else if (this._peek.type === 3 /* TAG_CLOSE */) {
77 this._consumeEndTag(this._advance());
78 }
79 else if (this._peek.type === 12 /* CDATA_START */) {
80 this._closeVoidElement();
81 this._consumeCdata(this._advance());
82 }
83 else if (this._peek.type === 10 /* COMMENT_START */) {
84 this._closeVoidElement();
85 this._consumeComment(this._advance());
86 }
87 else if (this._peek.type === 5 /* TEXT */ || this._peek.type === 7 /* RAW_TEXT */ ||
88 this._peek.type === 6 /* ESCAPABLE_RAW_TEXT */) {
89 this._closeVoidElement();
90 this._consumeText(this._advance());
91 }
92 else if (this._peek.type === 19 /* EXPANSION_FORM_START */) {
93 this._consumeExpansion(this._advance());
94 }
95 else {
96 // Skip all other tokens...
97 this._advance();
98 }
99 }
100 };
101 _TreeBuilder.prototype._advance = function () {
102 var prev = this._peek;
103 if (this._index < this.tokens.length - 1) {
104 // Note: there is always an EOF token at the end
105 this._index++;
106 }
107 this._peek = this.tokens[this._index];
108 return prev;
109 };
110 _TreeBuilder.prototype._advanceIf = function (type) {
111 if (this._peek.type === type) {
112 return this._advance();
113 }
114 return null;
115 };
116 _TreeBuilder.prototype._consumeCdata = function (_startToken) {
117 this._consumeText(this._advance());
118 this._advanceIf(13 /* CDATA_END */);
119 };
120 _TreeBuilder.prototype._consumeComment = function (token) {
121 var text = this._advanceIf(7 /* RAW_TEXT */);
122 this._advanceIf(11 /* COMMENT_END */);
123 var value = text != null ? text.parts[0].trim() : null;
124 this._addToParent(new html.Comment(value, token.sourceSpan));
125 };
126 _TreeBuilder.prototype._consumeExpansion = function (token) {
127 var switchValue = this._advance();
128 var type = this._advance();
129 var cases = [];
130 // read =
131 while (this._peek.type === 20 /* EXPANSION_CASE_VALUE */) {
132 var expCase = this._parseExpansionCase();
133 if (!expCase)
134 return; // error
135 cases.push(expCase);
136 }
137 // read the final }
138 if (this._peek.type !== 23 /* EXPANSION_FORM_END */) {
139 this.errors.push(TreeError.create(null, this._peek.sourceSpan, "Invalid ICU message. Missing '}'."));
140 return;
141 }
142 var sourceSpan = new parse_util_1.ParseSourceSpan(token.sourceSpan.start, this._peek.sourceSpan.end, token.sourceSpan.fullStart);
143 this._addToParent(new html.Expansion(switchValue.parts[0], type.parts[0], cases, sourceSpan, switchValue.sourceSpan));
144 this._advance();
145 };
146 _TreeBuilder.prototype._parseExpansionCase = function () {
147 var value = this._advance();
148 // read {
149 if (this._peek.type !== 21 /* EXPANSION_CASE_EXP_START */) {
150 this.errors.push(TreeError.create(null, this._peek.sourceSpan, "Invalid ICU message. Missing '{'."));
151 return null;
152 }
153 // read until }
154 var start = this._advance();
155 var exp = this._collectExpansionExpTokens(start);
156 if (!exp)
157 return null;
158 var end = this._advance();
159 exp.push({ type: 24 /* EOF */, parts: [], sourceSpan: end.sourceSpan });
160 // parse everything in between { and }
161 var expansionCaseParser = new _TreeBuilder(exp, this.getTagDefinition);
162 expansionCaseParser.build();
163 if (expansionCaseParser.errors.length > 0) {
164 this.errors = this.errors.concat(expansionCaseParser.errors);
165 return null;
166 }
167 var sourceSpan = new parse_util_1.ParseSourceSpan(value.sourceSpan.start, end.sourceSpan.end, value.sourceSpan.fullStart);
168 var expSourceSpan = new parse_util_1.ParseSourceSpan(start.sourceSpan.start, end.sourceSpan.end, start.sourceSpan.fullStart);
169 return new html.ExpansionCase(value.parts[0], expansionCaseParser.rootNodes, sourceSpan, value.sourceSpan, expSourceSpan);
170 };
171 _TreeBuilder.prototype._collectExpansionExpTokens = function (start) {
172 var exp = [];
173 var expansionFormStack = [21 /* EXPANSION_CASE_EXP_START */];
174 while (true) {
175 if (this._peek.type === 19 /* EXPANSION_FORM_START */ ||
176 this._peek.type === 21 /* EXPANSION_CASE_EXP_START */) {
177 expansionFormStack.push(this._peek.type);
178 }
179 if (this._peek.type === 22 /* EXPANSION_CASE_EXP_END */) {
180 if (lastOnStack(expansionFormStack, 21 /* EXPANSION_CASE_EXP_START */)) {
181 expansionFormStack.pop();
182 if (expansionFormStack.length === 0)
183 return exp;
184 }
185 else {
186 this.errors.push(TreeError.create(null, start.sourceSpan, "Invalid ICU message. Missing '}'."));
187 return null;
188 }
189 }
190 if (this._peek.type === 23 /* EXPANSION_FORM_END */) {
191 if (lastOnStack(expansionFormStack, 19 /* EXPANSION_FORM_START */)) {
192 expansionFormStack.pop();
193 }
194 else {
195 this.errors.push(TreeError.create(null, start.sourceSpan, "Invalid ICU message. Missing '}'."));
196 return null;
197 }
198 }
199 if (this._peek.type === 24 /* EOF */) {
200 this.errors.push(TreeError.create(null, start.sourceSpan, "Invalid ICU message. Missing '}'."));
201 return null;
202 }
203 exp.push(this._advance());
204 }
205 };
206 _TreeBuilder.prototype._consumeText = function (token) {
207 var tokens = [token];
208 var startSpan = token.sourceSpan;
209 var text = token.parts[0];
210 if (text.length > 0 && text[0] === '\n') {
211 var parent_1 = this._getParentElement();
212 if (parent_1 != null && parent_1.children.length === 0 &&
213 this.getTagDefinition(parent_1.name).ignoreFirstLf) {
214 text = text.substring(1);
215 tokens[0] = { type: token.type, sourceSpan: token.sourceSpan, parts: [text] };
216 }
217 }
218 while (this._peek.type === 8 /* INTERPOLATION */ || this._peek.type === 5 /* TEXT */ ||
219 this._peek.type === 9 /* ENCODED_ENTITY */) {
220 token = this._advance();
221 tokens.push(token);
222 if (token.type === 8 /* INTERPOLATION */) {
223 // For backward compatibility we decode HTML entities that appear in interpolation
224 // expressions. This is arguably a bug, but it could be a considerable breaking change to
225 // fix it. It should be addressed in a larger project to refactor the entire parser/lexer
226 // chain after View Engine has been removed.
227 text += token.parts.join('').replace(/&([^;]+);/g, decodeEntity);
228 }
229 else if (token.type === 9 /* ENCODED_ENTITY */) {
230 text += token.parts[0];
231 }
232 else {
233 text += token.parts.join('');
234 }
235 }
236 if (text.length > 0) {
237 var endSpan = token.sourceSpan;
238 this._addToParent(new html.Text(text, new parse_util_1.ParseSourceSpan(startSpan.start, endSpan.end, startSpan.fullStart, startSpan.details), tokens));
239 }
240 };
241 _TreeBuilder.prototype._closeVoidElement = function () {
242 var el = this._getParentElement();
243 if (el && this.getTagDefinition(el.name).isVoid) {
244 this._elementStack.pop();
245 }
246 };
247 _TreeBuilder.prototype._consumeStartTag = function (startTagToken) {
248 var _a = tslib_1.__read(startTagToken.parts, 2), prefix = _a[0], name = _a[1];
249 var attrs = [];
250 while (this._peek.type === 14 /* ATTR_NAME */) {
251 attrs.push(this._consumeAttr(this._advance()));
252 }
253 var fullName = this._getElementFullName(prefix, name, this._getParentElement());
254 var selfClosing = false;
255 // Note: There could have been a tokenizer error
256 // so that we don't get a token for the end tag...
257 if (this._peek.type === 2 /* TAG_OPEN_END_VOID */) {
258 this._advance();
259 selfClosing = true;
260 var tagDef = this.getTagDefinition(fullName);
261 if (!(tagDef.canSelfClose || tags_1.getNsPrefix(fullName) !== null || tagDef.isVoid)) {
262 this.errors.push(TreeError.create(fullName, startTagToken.sourceSpan, "Only void and foreign elements can be self closed \"" + startTagToken.parts[1] + "\""));
263 }
264 }
265 else if (this._peek.type === 1 /* TAG_OPEN_END */) {
266 this._advance();
267 selfClosing = false;
268 }
269 var end = this._peek.sourceSpan.fullStart;
270 var span = new parse_util_1.ParseSourceSpan(startTagToken.sourceSpan.start, end, startTagToken.sourceSpan.fullStart);
271 // Create a separate `startSpan` because `span` will be modified when there is an `end` span.
272 var startSpan = new parse_util_1.ParseSourceSpan(startTagToken.sourceSpan.start, end, startTagToken.sourceSpan.fullStart);
273 var el = new html.Element(fullName, attrs, [], span, startSpan, undefined);
274 this._pushElement(el);
275 if (selfClosing) {
276 // Elements that are self-closed have their `endSourceSpan` set to the full span, as the
277 // element start tag also represents the end tag.
278 this._popElement(fullName, span);
279 }
280 else if (startTagToken.type === 4 /* INCOMPLETE_TAG_OPEN */) {
281 // We already know the opening tag is not complete, so it is unlikely it has a corresponding
282 // close tag. Let's optimistically parse it as a full element and emit an error.
283 this._popElement(fullName, null);
284 this.errors.push(TreeError.create(fullName, span, "Opening tag \"" + fullName + "\" not terminated."));
285 }
286 };
287 _TreeBuilder.prototype._pushElement = function (el) {
288 var parentEl = this._getParentElement();
289 if (parentEl && this.getTagDefinition(parentEl.name).isClosedByChild(el.name)) {
290 this._elementStack.pop();
291 }
292 this._addToParent(el);
293 this._elementStack.push(el);
294 };
295 _TreeBuilder.prototype._consumeEndTag = function (endTagToken) {
296 var fullName = this._getElementFullName(endTagToken.parts[0], endTagToken.parts[1], this._getParentElement());
297 if (this.getTagDefinition(fullName).isVoid) {
298 this.errors.push(TreeError.create(fullName, endTagToken.sourceSpan, "Void elements do not have end tags \"" + endTagToken.parts[1] + "\""));
299 }
300 else if (!this._popElement(fullName, endTagToken.sourceSpan)) {
301 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";
302 this.errors.push(TreeError.create(fullName, endTagToken.sourceSpan, errMsg));
303 }
304 };
305 /**
306 * Closes the nearest element with the tag name `fullName` in the parse tree.
307 * `endSourceSpan` is the span of the closing tag, or null if the element does
308 * not have a closing tag (for example, this happens when an incomplete
309 * opening tag is recovered).
310 */
311 _TreeBuilder.prototype._popElement = function (fullName, endSourceSpan) {
312 var unexpectedCloseTagDetected = false;
313 for (var stackIndex = this._elementStack.length - 1; stackIndex >= 0; stackIndex--) {
314 var el = this._elementStack[stackIndex];
315 if (el.name === fullName) {
316 // Record the parse span with the element that is being closed. Any elements that are
317 // removed from the element stack at this point are closed implicitly, so they won't get
318 // an end source span (as there is no explicit closing element).
319 el.endSourceSpan = endSourceSpan;
320 el.sourceSpan.end = endSourceSpan !== null ? endSourceSpan.end : el.sourceSpan.end;
321 this._elementStack.splice(stackIndex, this._elementStack.length - stackIndex);
322 return !unexpectedCloseTagDetected;
323 }
324 if (!this.getTagDefinition(el.name).closedByParent) {
325 // Note that we encountered an unexpected close tag but continue processing the element
326 // stack so we can assign an `endSourceSpan` if there is a corresponding start tag for this
327 // end tag in the stack.
328 unexpectedCloseTagDetected = true;
329 }
330 }
331 return false;
332 };
333 _TreeBuilder.prototype._consumeAttr = function (attrName) {
334 var fullName = tags_1.mergeNsAndName(attrName.parts[0], attrName.parts[1]);
335 var attrEnd = attrName.sourceSpan.end;
336 // Consume any quote
337 if (this._peek.type === 15 /* ATTR_QUOTE */) {
338 this._advance();
339 }
340 // Consume the attribute value
341 var value = '';
342 var valueTokens = [];
343 var valueStartSpan = undefined;
344 var valueEnd = undefined;
345 // NOTE: We need to use a new variable `nextTokenType` here to hide the actual type of
346 // `_peek.type` from TS. Otherwise TS will narrow the type of `_peek.type` preventing it from
347 // being able to consider `ATTR_VALUE_INTERPOLATION` as an option. This is because TS is not
348 // able to see that `_advance()` will actually mutate `_peek`.
349 var nextTokenType = this._peek.type;
350 if (nextTokenType === 16 /* ATTR_VALUE_TEXT */) {
351 valueStartSpan = this._peek.sourceSpan;
352 valueEnd = this._peek.sourceSpan.end;
353 while (this._peek.type === 16 /* ATTR_VALUE_TEXT */ ||
354 this._peek.type === 17 /* ATTR_VALUE_INTERPOLATION */ ||
355 this._peek.type === 9 /* ENCODED_ENTITY */) {
356 var valueToken = this._advance();
357 valueTokens.push(valueToken);
358 if (valueToken.type === 17 /* ATTR_VALUE_INTERPOLATION */) {
359 // For backward compatibility we decode HTML entities that appear in interpolation
360 // expressions. This is arguably a bug, but it could be a considerable breaking change to
361 // fix it. It should be addressed in a larger project to refactor the entire parser/lexer
362 // chain after View Engine has been removed.
363 value += valueToken.parts.join('').replace(/&([^;]+);/g, decodeEntity);
364 }
365 else if (valueToken.type === 9 /* ENCODED_ENTITY */) {
366 value += valueToken.parts[0];
367 }
368 else {
369 value += valueToken.parts.join('');
370 }
371 valueEnd = attrEnd = valueToken.sourceSpan.end;
372 }
373 }
374 // Consume any quote
375 if (this._peek.type === 15 /* ATTR_QUOTE */) {
376 var quoteToken = this._advance();
377 attrEnd = quoteToken.sourceSpan.end;
378 }
379 var valueSpan = valueStartSpan && valueEnd &&
380 new parse_util_1.ParseSourceSpan(valueStartSpan.start, valueEnd, valueStartSpan.fullStart);
381 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);
382 };
383 _TreeBuilder.prototype._getParentElement = function () {
384 return this._elementStack.length > 0 ? this._elementStack[this._elementStack.length - 1] : null;
385 };
386 _TreeBuilder.prototype._addToParent = function (node) {
387 var parent = this._getParentElement();
388 if (parent != null) {
389 parent.children.push(node);
390 }
391 else {
392 this.rootNodes.push(node);
393 }
394 };
395 _TreeBuilder.prototype._getElementFullName = function (prefix, localName, parentElement) {
396 if (prefix === '') {
397 prefix = this.getTagDefinition(localName).implicitNamespacePrefix || '';
398 if (prefix === '' && parentElement != null) {
399 var parentTagName = tags_1.splitNsName(parentElement.name)[1];
400 var parentTagDefinition = this.getTagDefinition(parentTagName);
401 if (!parentTagDefinition.preventNamespaceInheritance) {
402 prefix = tags_1.getNsPrefix(parentElement.name);
403 }
404 }
405 }
406 return tags_1.mergeNsAndName(prefix, localName);
407 };
408 return _TreeBuilder;
409 }());
410 function lastOnStack(stack, element) {
411 return stack.length > 0 && stack[stack.length - 1] === element;
412 }
413 /**
414 * Decode the `entity` string, which we believe is the contents of an HTML entity.
415 *
416 * If the string is not actually a valid/known entity then just return the original `match` string.
417 */
418 function decodeEntity(match, entity) {
419 if (entities_1.NAMED_ENTITIES[entity] !== undefined) {
420 return entities_1.NAMED_ENTITIES[entity] || match;
421 }
422 if (/^#x[a-f0-9]+$/i.test(entity)) {
423 return String.fromCodePoint(parseInt(entity.slice(2), 16));
424 }
425 if (/^#\d+$/.test(entity)) {
426 return String.fromCodePoint(parseInt(entity.slice(1), 10));
427 }
428 return match;
429 }
430});
431//# 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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"]}
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