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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 */
8import * as chars from '../chars';
9import { ParseError, ParseLocation, ParseSourceFile, ParseSourceSpan } from '../parse_util';
10import { NAMED_ENTITIES } from './entities';
11import { DEFAULT_INTERPOLATION_CONFIG } from './interpolation_config';
12import { TagContentType } from './tags';
13export class TokenError extends ParseError {
14 constructor(errorMsg, tokenType, span) {
15 super(span, errorMsg);
16 this.tokenType = tokenType;
17 }
18}
19export class TokenizeResult {
20 constructor(tokens, errors, nonNormalizedIcuExpressions) {
21 this.tokens = tokens;
22 this.errors = errors;
23 this.nonNormalizedIcuExpressions = nonNormalizedIcuExpressions;
24 }
25}
26export function tokenize(source, url, getTagDefinition, options = {}) {
27 const tokenizer = new _Tokenizer(new ParseSourceFile(source, url), getTagDefinition, options);
28 tokenizer.tokenize();
29 return new TokenizeResult(mergeTextTokens(tokenizer.tokens), tokenizer.errors, tokenizer.nonNormalizedIcuExpressions);
30}
31const _CR_OR_CRLF_REGEXP = /\r\n?/g;
32function _unexpectedCharacterErrorMsg(charCode) {
33 const char = charCode === chars.$EOF ? 'EOF' : String.fromCharCode(charCode);
34 return `Unexpected character "${char}"`;
35}
36function _unknownEntityErrorMsg(entitySrc) {
37 return `Unknown entity "${entitySrc}" - use the "&#<decimal>;" or "&#x<hex>;" syntax`;
38}
39function _unparsableEntityErrorMsg(type, entityStr) {
40 return `Unable to parse entity "${entityStr}" - ${type} character reference entities must end with ";"`;
41}
42var CharacterReferenceType;
43(function (CharacterReferenceType) {
44 CharacterReferenceType["HEX"] = "hexadecimal";
45 CharacterReferenceType["DEC"] = "decimal";
46})(CharacterReferenceType || (CharacterReferenceType = {}));
47class _ControlFlowError {
48 constructor(error) {
49 this.error = error;
50 }
51}
52// See https://www.w3.org/TR/html51/syntax.html#writing-html-documents
53class _Tokenizer {
54 /**
55 * @param _file The html source file being tokenized.
56 * @param _getTagDefinition A function that will retrieve a tag definition for a given tag name.
57 * @param options Configuration of the tokenization.
58 */
59 constructor(_file, _getTagDefinition, options) {
60 this._getTagDefinition = _getTagDefinition;
61 this._currentTokenStart = null;
62 this._currentTokenType = null;
63 this._expansionCaseStack = [];
64 this._inInterpolation = false;
65 this.tokens = [];
66 this.errors = [];
67 this.nonNormalizedIcuExpressions = [];
68 this._tokenizeIcu = options.tokenizeExpansionForms || false;
69 this._interpolationConfig = options.interpolationConfig || DEFAULT_INTERPOLATION_CONFIG;
70 this._leadingTriviaCodePoints =
71 options.leadingTriviaChars && options.leadingTriviaChars.map(c => c.codePointAt(0) || 0);
72 const range = options.range || { endPos: _file.content.length, startPos: 0, startLine: 0, startCol: 0 };
73 this._cursor = options.escapedString ? new EscapedCharacterCursor(_file, range) :
74 new PlainCharacterCursor(_file, range);
75 this._preserveLineEndings = options.preserveLineEndings || false;
76 this._escapedString = options.escapedString || false;
77 this._i18nNormalizeLineEndingsInICUs = options.i18nNormalizeLineEndingsInICUs || false;
78 try {
79 this._cursor.init();
80 }
81 catch (e) {
82 this.handleError(e);
83 }
84 }
85 _processCarriageReturns(content) {
86 if (this._preserveLineEndings) {
87 return content;
88 }
89 // https://www.w3.org/TR/html51/syntax.html#preprocessing-the-input-stream
90 // In order to keep the original position in the source, we can not
91 // pre-process it.
92 // Instead CRs are processed right before instantiating the tokens.
93 return content.replace(_CR_OR_CRLF_REGEXP, '\n');
94 }
95 tokenize() {
96 while (this._cursor.peek() !== chars.$EOF) {
97 const start = this._cursor.clone();
98 try {
99 if (this._attemptCharCode(chars.$LT)) {
100 if (this._attemptCharCode(chars.$BANG)) {
101 if (this._attemptCharCode(chars.$LBRACKET)) {
102 this._consumeCdata(start);
103 }
104 else if (this._attemptCharCode(chars.$MINUS)) {
105 this._consumeComment(start);
106 }
107 else {
108 this._consumeDocType(start);
109 }
110 }
111 else if (this._attemptCharCode(chars.$SLASH)) {
112 this._consumeTagClose(start);
113 }
114 else {
115 this._consumeTagOpen(start);
116 }
117 }
118 else if (!(this._tokenizeIcu && this._tokenizeExpansionForm())) {
119 // In (possibly interpolated) text the end of the text is given by `isTextEnd()`, while
120 // the premature end of an interpolation is given by the start of a new HTML element.
121 this._consumeWithInterpolation(5 /* TEXT */, 8 /* INTERPOLATION */, () => this._isTextEnd(), () => this._isTagStart());
122 }
123 }
124 catch (e) {
125 this.handleError(e);
126 }
127 }
128 this._beginToken(24 /* EOF */);
129 this._endToken([]);
130 }
131 /**
132 * @returns whether an ICU token has been created
133 * @internal
134 */
135 _tokenizeExpansionForm() {
136 if (this.isExpansionFormStart()) {
137 this._consumeExpansionFormStart();
138 return true;
139 }
140 if (isExpansionCaseStart(this._cursor.peek()) && this._isInExpansionForm()) {
141 this._consumeExpansionCaseStart();
142 return true;
143 }
144 if (this._cursor.peek() === chars.$RBRACE) {
145 if (this._isInExpansionCase()) {
146 this._consumeExpansionCaseEnd();
147 return true;
148 }
149 if (this._isInExpansionForm()) {
150 this._consumeExpansionFormEnd();
151 return true;
152 }
153 }
154 return false;
155 }
156 _beginToken(type, start = this._cursor.clone()) {
157 this._currentTokenStart = start;
158 this._currentTokenType = type;
159 }
160 _endToken(parts, end) {
161 if (this._currentTokenStart === null) {
162 throw new TokenError('Programming error - attempted to end a token when there was no start to the token', this._currentTokenType, this._cursor.getSpan(end));
163 }
164 if (this._currentTokenType === null) {
165 throw new TokenError('Programming error - attempted to end a token which has no token type', null, this._cursor.getSpan(this._currentTokenStart));
166 }
167 const token = {
168 type: this._currentTokenType,
169 parts,
170 sourceSpan: (end ?? this._cursor).getSpan(this._currentTokenStart, this._leadingTriviaCodePoints),
171 };
172 this.tokens.push(token);
173 this._currentTokenStart = null;
174 this._currentTokenType = null;
175 return token;
176 }
177 _createError(msg, span) {
178 if (this._isInExpansionForm()) {
179 msg += ` (Do you have an unescaped "{" in your template? Use "{{ '{' }}") to escape it.)`;
180 }
181 const error = new TokenError(msg, this._currentTokenType, span);
182 this._currentTokenStart = null;
183 this._currentTokenType = null;
184 return new _ControlFlowError(error);
185 }
186 handleError(e) {
187 if (e instanceof CursorError) {
188 e = this._createError(e.msg, this._cursor.getSpan(e.cursor));
189 }
190 if (e instanceof _ControlFlowError) {
191 this.errors.push(e.error);
192 }
193 else {
194 throw e;
195 }
196 }
197 _attemptCharCode(charCode) {
198 if (this._cursor.peek() === charCode) {
199 this._cursor.advance();
200 return true;
201 }
202 return false;
203 }
204 _attemptCharCodeCaseInsensitive(charCode) {
205 if (compareCharCodeCaseInsensitive(this._cursor.peek(), charCode)) {
206 this._cursor.advance();
207 return true;
208 }
209 return false;
210 }
211 _requireCharCode(charCode) {
212 const location = this._cursor.clone();
213 if (!this._attemptCharCode(charCode)) {
214 throw this._createError(_unexpectedCharacterErrorMsg(this._cursor.peek()), this._cursor.getSpan(location));
215 }
216 }
217 _attemptStr(chars) {
218 const len = chars.length;
219 if (this._cursor.charsLeft() < len) {
220 return false;
221 }
222 const initialPosition = this._cursor.clone();
223 for (let i = 0; i < len; i++) {
224 if (!this._attemptCharCode(chars.charCodeAt(i))) {
225 // If attempting to parse the string fails, we want to reset the parser
226 // to where it was before the attempt
227 this._cursor = initialPosition;
228 return false;
229 }
230 }
231 return true;
232 }
233 _attemptStrCaseInsensitive(chars) {
234 for (let i = 0; i < chars.length; i++) {
235 if (!this._attemptCharCodeCaseInsensitive(chars.charCodeAt(i))) {
236 return false;
237 }
238 }
239 return true;
240 }
241 _requireStr(chars) {
242 const location = this._cursor.clone();
243 if (!this._attemptStr(chars)) {
244 throw this._createError(_unexpectedCharacterErrorMsg(this._cursor.peek()), this._cursor.getSpan(location));
245 }
246 }
247 _attemptCharCodeUntilFn(predicate) {
248 while (!predicate(this._cursor.peek())) {
249 this._cursor.advance();
250 }
251 }
252 _requireCharCodeUntilFn(predicate, len) {
253 const start = this._cursor.clone();
254 this._attemptCharCodeUntilFn(predicate);
255 if (this._cursor.diff(start) < len) {
256 throw this._createError(_unexpectedCharacterErrorMsg(this._cursor.peek()), this._cursor.getSpan(start));
257 }
258 }
259 _attemptUntilChar(char) {
260 while (this._cursor.peek() !== char) {
261 this._cursor.advance();
262 }
263 }
264 _readChar() {
265 // Don't rely upon reading directly from `_input` as the actual char value
266 // may have been generated from an escape sequence.
267 const char = String.fromCodePoint(this._cursor.peek());
268 this._cursor.advance();
269 return char;
270 }
271 _consumeEntity(textTokenType) {
272 this._beginToken(9 /* ENCODED_ENTITY */);
273 const start = this._cursor.clone();
274 this._cursor.advance();
275 if (this._attemptCharCode(chars.$HASH)) {
276 const isHex = this._attemptCharCode(chars.$x) || this._attemptCharCode(chars.$X);
277 const codeStart = this._cursor.clone();
278 this._attemptCharCodeUntilFn(isDigitEntityEnd);
279 if (this._cursor.peek() != chars.$SEMICOLON) {
280 // Advance cursor to include the peeked character in the string provided to the error
281 // message.
282 this._cursor.advance();
283 const entityType = isHex ? CharacterReferenceType.HEX : CharacterReferenceType.DEC;
284 throw this._createError(_unparsableEntityErrorMsg(entityType, this._cursor.getChars(start)), this._cursor.getSpan());
285 }
286 const strNum = this._cursor.getChars(codeStart);
287 this._cursor.advance();
288 try {
289 const charCode = parseInt(strNum, isHex ? 16 : 10);
290 this._endToken([String.fromCharCode(charCode), this._cursor.getChars(start)]);
291 }
292 catch {
293 throw this._createError(_unknownEntityErrorMsg(this._cursor.getChars(start)), this._cursor.getSpan());
294 }
295 }
296 else {
297 const nameStart = this._cursor.clone();
298 this._attemptCharCodeUntilFn(isNamedEntityEnd);
299 if (this._cursor.peek() != chars.$SEMICOLON) {
300 // No semicolon was found so abort the encoded entity token that was in progress, and treat
301 // this as a text token
302 this._beginToken(textTokenType, start);
303 this._cursor = nameStart;
304 this._endToken(['&']);
305 }
306 else {
307 const name = this._cursor.getChars(nameStart);
308 this._cursor.advance();
309 const char = NAMED_ENTITIES[name];
310 if (!char) {
311 throw this._createError(_unknownEntityErrorMsg(name), this._cursor.getSpan(start));
312 }
313 this._endToken([char, `&${name};`]);
314 }
315 }
316 }
317 _consumeRawText(consumeEntities, endMarkerPredicate) {
318 this._beginToken(consumeEntities ? 6 /* ESCAPABLE_RAW_TEXT */ : 7 /* RAW_TEXT */);
319 const parts = [];
320 while (true) {
321 const tagCloseStart = this._cursor.clone();
322 const foundEndMarker = endMarkerPredicate();
323 this._cursor = tagCloseStart;
324 if (foundEndMarker) {
325 break;
326 }
327 if (consumeEntities && this._cursor.peek() === chars.$AMPERSAND) {
328 this._endToken([this._processCarriageReturns(parts.join(''))]);
329 parts.length = 0;
330 this._consumeEntity(6 /* ESCAPABLE_RAW_TEXT */);
331 this._beginToken(6 /* ESCAPABLE_RAW_TEXT */);
332 }
333 else {
334 parts.push(this._readChar());
335 }
336 }
337 this._endToken([this._processCarriageReturns(parts.join(''))]);
338 }
339 _consumeComment(start) {
340 this._beginToken(10 /* COMMENT_START */, start);
341 this._requireCharCode(chars.$MINUS);
342 this._endToken([]);
343 this._consumeRawText(false, () => this._attemptStr('-->'));
344 this._beginToken(11 /* COMMENT_END */);
345 this._requireStr('-->');
346 this._endToken([]);
347 }
348 _consumeCdata(start) {
349 this._beginToken(12 /* CDATA_START */, start);
350 this._requireStr('CDATA[');
351 this._endToken([]);
352 this._consumeRawText(false, () => this._attemptStr(']]>'));
353 this._beginToken(13 /* CDATA_END */);
354 this._requireStr(']]>');
355 this._endToken([]);
356 }
357 _consumeDocType(start) {
358 this._beginToken(18 /* DOC_TYPE */, start);
359 const contentStart = this._cursor.clone();
360 this._attemptUntilChar(chars.$GT);
361 const content = this._cursor.getChars(contentStart);
362 this._cursor.advance();
363 this._endToken([content]);
364 }
365 _consumePrefixAndName() {
366 const nameOrPrefixStart = this._cursor.clone();
367 let prefix = '';
368 while (this._cursor.peek() !== chars.$COLON && !isPrefixEnd(this._cursor.peek())) {
369 this._cursor.advance();
370 }
371 let nameStart;
372 if (this._cursor.peek() === chars.$COLON) {
373 prefix = this._cursor.getChars(nameOrPrefixStart);
374 this._cursor.advance();
375 nameStart = this._cursor.clone();
376 }
377 else {
378 nameStart = nameOrPrefixStart;
379 }
380 this._requireCharCodeUntilFn(isNameEnd, prefix === '' ? 0 : 1);
381 const name = this._cursor.getChars(nameStart);
382 return [prefix, name];
383 }
384 _consumeTagOpen(start) {
385 let tagName;
386 let prefix;
387 let openTagToken;
388 try {
389 if (!chars.isAsciiLetter(this._cursor.peek())) {
390 throw this._createError(_unexpectedCharacterErrorMsg(this._cursor.peek()), this._cursor.getSpan(start));
391 }
392 openTagToken = this._consumeTagOpenStart(start);
393 prefix = openTagToken.parts[0];
394 tagName = openTagToken.parts[1];
395 this._attemptCharCodeUntilFn(isNotWhitespace);
396 while (this._cursor.peek() !== chars.$SLASH && this._cursor.peek() !== chars.$GT &&
397 this._cursor.peek() !== chars.$LT && this._cursor.peek() !== chars.$EOF) {
398 this._consumeAttributeName();
399 this._attemptCharCodeUntilFn(isNotWhitespace);
400 if (this._attemptCharCode(chars.$EQ)) {
401 this._attemptCharCodeUntilFn(isNotWhitespace);
402 this._consumeAttributeValue();
403 }
404 this._attemptCharCodeUntilFn(isNotWhitespace);
405 }
406 this._consumeTagOpenEnd();
407 }
408 catch (e) {
409 if (e instanceof _ControlFlowError) {
410 if (openTagToken) {
411 // We errored before we could close the opening tag, so it is incomplete.
412 openTagToken.type = 4 /* INCOMPLETE_TAG_OPEN */;
413 }
414 else {
415 // When the start tag is invalid, assume we want a "<" as text.
416 // Back to back text tokens are merged at the end.
417 this._beginToken(5 /* TEXT */, start);
418 this._endToken(['<']);
419 }
420 return;
421 }
422 throw e;
423 }
424 const contentTokenType = this._getTagDefinition(tagName).getContentType(prefix);
425 if (contentTokenType === TagContentType.RAW_TEXT) {
426 this._consumeRawTextWithTagClose(prefix, tagName, false);
427 }
428 else if (contentTokenType === TagContentType.ESCAPABLE_RAW_TEXT) {
429 this._consumeRawTextWithTagClose(prefix, tagName, true);
430 }
431 }
432 _consumeRawTextWithTagClose(prefix, tagName, consumeEntities) {
433 this._consumeRawText(consumeEntities, () => {
434 if (!this._attemptCharCode(chars.$LT))
435 return false;
436 if (!this._attemptCharCode(chars.$SLASH))
437 return false;
438 this._attemptCharCodeUntilFn(isNotWhitespace);
439 if (!this._attemptStrCaseInsensitive(tagName))
440 return false;
441 this._attemptCharCodeUntilFn(isNotWhitespace);
442 return this._attemptCharCode(chars.$GT);
443 });
444 this._beginToken(3 /* TAG_CLOSE */);
445 this._requireCharCodeUntilFn(code => code === chars.$GT, 3);
446 this._cursor.advance(); // Consume the `>`
447 this._endToken([prefix, tagName]);
448 }
449 _consumeTagOpenStart(start) {
450 this._beginToken(0 /* TAG_OPEN_START */, start);
451 const parts = this._consumePrefixAndName();
452 return this._endToken(parts);
453 }
454 _consumeAttributeName() {
455 const attrNameStart = this._cursor.peek();
456 if (attrNameStart === chars.$SQ || attrNameStart === chars.$DQ) {
457 throw this._createError(_unexpectedCharacterErrorMsg(attrNameStart), this._cursor.getSpan());
458 }
459 this._beginToken(14 /* ATTR_NAME */);
460 const prefixAndName = this._consumePrefixAndName();
461 this._endToken(prefixAndName);
462 }
463 _consumeAttributeValue() {
464 let value;
465 if (this._cursor.peek() === chars.$SQ || this._cursor.peek() === chars.$DQ) {
466 const quoteChar = this._cursor.peek();
467 this._consumeQuote(quoteChar);
468 // In an attribute then end of the attribute value and the premature end to an interpolation
469 // are both triggered by the `quoteChar`.
470 const endPredicate = () => this._cursor.peek() === quoteChar;
471 this._consumeWithInterpolation(16 /* ATTR_VALUE_TEXT */, 17 /* ATTR_VALUE_INTERPOLATION */, endPredicate, endPredicate);
472 this._consumeQuote(quoteChar);
473 }
474 else {
475 const endPredicate = () => isNameEnd(this._cursor.peek());
476 this._consumeWithInterpolation(16 /* ATTR_VALUE_TEXT */, 17 /* ATTR_VALUE_INTERPOLATION */, endPredicate, endPredicate);
477 }
478 }
479 _consumeQuote(quoteChar) {
480 this._beginToken(15 /* ATTR_QUOTE */);
481 this._requireCharCode(quoteChar);
482 this._endToken([String.fromCodePoint(quoteChar)]);
483 }
484 _consumeTagOpenEnd() {
485 const tokenType = this._attemptCharCode(chars.$SLASH) ? 2 /* TAG_OPEN_END_VOID */ : 1 /* TAG_OPEN_END */;
486 this._beginToken(tokenType);
487 this._requireCharCode(chars.$GT);
488 this._endToken([]);
489 }
490 _consumeTagClose(start) {
491 this._beginToken(3 /* TAG_CLOSE */, start);
492 this._attemptCharCodeUntilFn(isNotWhitespace);
493 const prefixAndName = this._consumePrefixAndName();
494 this._attemptCharCodeUntilFn(isNotWhitespace);
495 this._requireCharCode(chars.$GT);
496 this._endToken(prefixAndName);
497 }
498 _consumeExpansionFormStart() {
499 this._beginToken(19 /* EXPANSION_FORM_START */);
500 this._requireCharCode(chars.$LBRACE);
501 this._endToken([]);
502 this._expansionCaseStack.push(19 /* EXPANSION_FORM_START */);
503 this._beginToken(7 /* RAW_TEXT */);
504 const condition = this._readUntil(chars.$COMMA);
505 const normalizedCondition = this._processCarriageReturns(condition);
506 if (this._i18nNormalizeLineEndingsInICUs) {
507 // We explicitly want to normalize line endings for this text.
508 this._endToken([normalizedCondition]);
509 }
510 else {
511 // We are not normalizing line endings.
512 const conditionToken = this._endToken([condition]);
513 if (normalizedCondition !== condition) {
514 this.nonNormalizedIcuExpressions.push(conditionToken);
515 }
516 }
517 this._requireCharCode(chars.$COMMA);
518 this._attemptCharCodeUntilFn(isNotWhitespace);
519 this._beginToken(7 /* RAW_TEXT */);
520 const type = this._readUntil(chars.$COMMA);
521 this._endToken([type]);
522 this._requireCharCode(chars.$COMMA);
523 this._attemptCharCodeUntilFn(isNotWhitespace);
524 }
525 _consumeExpansionCaseStart() {
526 this._beginToken(20 /* EXPANSION_CASE_VALUE */);
527 const value = this._readUntil(chars.$LBRACE).trim();
528 this._endToken([value]);
529 this._attemptCharCodeUntilFn(isNotWhitespace);
530 this._beginToken(21 /* EXPANSION_CASE_EXP_START */);
531 this._requireCharCode(chars.$LBRACE);
532 this._endToken([]);
533 this._attemptCharCodeUntilFn(isNotWhitespace);
534 this._expansionCaseStack.push(21 /* EXPANSION_CASE_EXP_START */);
535 }
536 _consumeExpansionCaseEnd() {
537 this._beginToken(22 /* EXPANSION_CASE_EXP_END */);
538 this._requireCharCode(chars.$RBRACE);
539 this._endToken([]);
540 this._attemptCharCodeUntilFn(isNotWhitespace);
541 this._expansionCaseStack.pop();
542 }
543 _consumeExpansionFormEnd() {
544 this._beginToken(23 /* EXPANSION_FORM_END */);
545 this._requireCharCode(chars.$RBRACE);
546 this._endToken([]);
547 this._expansionCaseStack.pop();
548 }
549 /**
550 * Consume a string that may contain interpolation expressions.
551 *
552 * The first token consumed will be of `tokenType` and then there will be alternating
553 * `interpolationTokenType` and `tokenType` tokens until the `endPredicate()` returns true.
554 *
555 * If an interpolation token ends prematurely it will have no end marker in its `parts` array.
556 *
557 * @param textTokenType the kind of tokens to interleave around interpolation tokens.
558 * @param interpolationTokenType the kind of tokens that contain interpolation.
559 * @param endPredicate a function that should return true when we should stop consuming.
560 * @param endInterpolation a function that should return true if there is a premature end to an
561 * interpolation expression - i.e. before we get to the normal interpolation closing marker.
562 */
563 _consumeWithInterpolation(textTokenType, interpolationTokenType, endPredicate, endInterpolation) {
564 this._beginToken(textTokenType);
565 const parts = [];
566 while (!endPredicate()) {
567 const current = this._cursor.clone();
568 if (this._interpolationConfig && this._attemptStr(this._interpolationConfig.start)) {
569 this._endToken([this._processCarriageReturns(parts.join(''))], current);
570 parts.length = 0;
571 this._consumeInterpolation(interpolationTokenType, current, endInterpolation);
572 this._beginToken(textTokenType);
573 }
574 else if (this._cursor.peek() === chars.$AMPERSAND) {
575 this._endToken([this._processCarriageReturns(parts.join(''))]);
576 parts.length = 0;
577 this._consumeEntity(textTokenType);
578 this._beginToken(textTokenType);
579 }
580 else {
581 parts.push(this._readChar());
582 }
583 }
584 // It is possible that an interpolation was started but not ended inside this text token.
585 // Make sure that we reset the state of the lexer correctly.
586 this._inInterpolation = false;
587 this._endToken([this._processCarriageReturns(parts.join(''))]);
588 }
589 /**
590 * Consume a block of text that has been interpreted as an Angular interpolation.
591 *
592 * @param interpolationTokenType the type of the interpolation token to generate.
593 * @param interpolationStart a cursor that points to the start of this interpolation.
594 * @param prematureEndPredicate a function that should return true if the next characters indicate
595 * an end to the interpolation before its normal closing marker.
596 */
597 _consumeInterpolation(interpolationTokenType, interpolationStart, prematureEndPredicate) {
598 const parts = [];
599 this._beginToken(interpolationTokenType, interpolationStart);
600 parts.push(this._interpolationConfig.start);
601 // Find the end of the interpolation, ignoring content inside quotes.
602 const expressionStart = this._cursor.clone();
603 let inQuote = null;
604 let inComment = false;
605 while (this._cursor.peek() !== chars.$EOF &&
606 (prematureEndPredicate === null || !prematureEndPredicate())) {
607 const current = this._cursor.clone();
608 if (this._isTagStart()) {
609 // We are starting what looks like an HTML element in the middle of this interpolation.
610 // Reset the cursor to before the `<` character and end the interpolation token.
611 // (This is actually wrong but here for backward compatibility).
612 this._cursor = current;
613 parts.push(this._getProcessedChars(expressionStart, current));
614 this._endToken(parts);
615 return;
616 }
617 if (inQuote === null) {
618 if (this._attemptStr(this._interpolationConfig.end)) {
619 // We are not in a string, and we hit the end interpolation marker
620 parts.push(this._getProcessedChars(expressionStart, current));
621 parts.push(this._interpolationConfig.end);
622 this._endToken(parts);
623 return;
624 }
625 else if (this._attemptStr('//')) {
626 // Once we are in a comment we ignore any quotes
627 inComment = true;
628 }
629 }
630 const char = this._cursor.peek();
631 this._cursor.advance();
632 if (char === chars.$BACKSLASH) {
633 // Skip the next character because it was escaped.
634 this._cursor.advance();
635 }
636 else if (char === inQuote) {
637 // Exiting the current quoted string
638 inQuote = null;
639 }
640 else if (!inComment && inQuote === null && chars.isQuote(char)) {
641 // Entering a new quoted string
642 inQuote = char;
643 }
644 }
645 // We hit EOF without finding a closing interpolation marker
646 parts.push(this._getProcessedChars(expressionStart, this._cursor));
647 this._endToken(parts);
648 }
649 _getProcessedChars(start, end) {
650 return this._processCarriageReturns(end.getChars(start));
651 }
652 _isTextEnd() {
653 if (this._isTagStart() || this._cursor.peek() === chars.$EOF) {
654 return true;
655 }
656 if (this._tokenizeIcu && !this._inInterpolation) {
657 if (this.isExpansionFormStart()) {
658 // start of an expansion form
659 return true;
660 }
661 if (this._cursor.peek() === chars.$RBRACE && this._isInExpansionCase()) {
662 // end of and expansion case
663 return true;
664 }
665 }
666 return false;
667 }
668 /**
669 * Returns true if the current cursor is pointing to the start of a tag
670 * (opening/closing/comments/cdata/etc).
671 */
672 _isTagStart() {
673 if (this._cursor.peek() === chars.$LT) {
674 // We assume that `<` followed by whitespace is not the start of an HTML element.
675 const tmp = this._cursor.clone();
676 tmp.advance();
677 // If the next character is alphabetic, ! nor / then it is a tag start
678 const code = tmp.peek();
679 if ((chars.$a <= code && code <= chars.$z) || (chars.$A <= code && code <= chars.$Z) ||
680 code === chars.$SLASH || code === chars.$BANG) {
681 return true;
682 }
683 }
684 return false;
685 }
686 _readUntil(char) {
687 const start = this._cursor.clone();
688 this._attemptUntilChar(char);
689 return this._cursor.getChars(start);
690 }
691 _isInExpansionCase() {
692 return this._expansionCaseStack.length > 0 &&
693 this._expansionCaseStack[this._expansionCaseStack.length - 1] ===
694 21 /* EXPANSION_CASE_EXP_START */;
695 }
696 _isInExpansionForm() {
697 return this._expansionCaseStack.length > 0 &&
698 this._expansionCaseStack[this._expansionCaseStack.length - 1] ===
699 19 /* EXPANSION_FORM_START */;
700 }
701 isExpansionFormStart() {
702 if (this._cursor.peek() !== chars.$LBRACE) {
703 return false;
704 }
705 if (this._interpolationConfig) {
706 const start = this._cursor.clone();
707 const isInterpolation = this._attemptStr(this._interpolationConfig.start);
708 this._cursor = start;
709 return !isInterpolation;
710 }
711 return true;
712 }
713}
714function isNotWhitespace(code) {
715 return !chars.isWhitespace(code) || code === chars.$EOF;
716}
717function isNameEnd(code) {
718 return chars.isWhitespace(code) || code === chars.$GT || code === chars.$LT ||
719 code === chars.$SLASH || code === chars.$SQ || code === chars.$DQ || code === chars.$EQ ||
720 code === chars.$EOF;
721}
722function isPrefixEnd(code) {
723 return (code < chars.$a || chars.$z < code) && (code < chars.$A || chars.$Z < code) &&
724 (code < chars.$0 || code > chars.$9);
725}
726function isDigitEntityEnd(code) {
727 return code === chars.$SEMICOLON || code === chars.$EOF || !chars.isAsciiHexDigit(code);
728}
729function isNamedEntityEnd(code) {
730 return code === chars.$SEMICOLON || code === chars.$EOF || !chars.isAsciiLetter(code);
731}
732function isExpansionCaseStart(peek) {
733 return peek !== chars.$RBRACE;
734}
735function compareCharCodeCaseInsensitive(code1, code2) {
736 return toUpperCaseCharCode(code1) === toUpperCaseCharCode(code2);
737}
738function toUpperCaseCharCode(code) {
739 return code >= chars.$a && code <= chars.$z ? code - chars.$a + chars.$A : code;
740}
741function mergeTextTokens(srcTokens) {
742 const dstTokens = [];
743 let lastDstToken = undefined;
744 for (let i = 0; i < srcTokens.length; i++) {
745 const token = srcTokens[i];
746 if ((lastDstToken && lastDstToken.type === 5 /* TEXT */ && token.type === 5 /* TEXT */) ||
747 (lastDstToken && lastDstToken.type === 16 /* ATTR_VALUE_TEXT */ &&
748 token.type === 16 /* ATTR_VALUE_TEXT */)) {
749 lastDstToken.parts[0] += token.parts[0];
750 lastDstToken.sourceSpan.end = token.sourceSpan.end;
751 }
752 else {
753 lastDstToken = token;
754 dstTokens.push(lastDstToken);
755 }
756 }
757 return dstTokens;
758}
759class PlainCharacterCursor {
760 constructor(fileOrCursor, range) {
761 if (fileOrCursor instanceof PlainCharacterCursor) {
762 this.file = fileOrCursor.file;
763 this.input = fileOrCursor.input;
764 this.end = fileOrCursor.end;
765 const state = fileOrCursor.state;
766 // Note: avoid using `{...fileOrCursor.state}` here as that has a severe performance penalty.
767 // In ES5 bundles the object spread operator is translated into the `__assign` helper, which
768 // is not optimized by VMs as efficiently as a raw object literal. Since this constructor is
769 // called in tight loops, this difference matters.
770 this.state = {
771 peek: state.peek,
772 offset: state.offset,
773 line: state.line,
774 column: state.column,
775 };
776 }
777 else {
778 if (!range) {
779 throw new Error('Programming error: the range argument must be provided with a file argument.');
780 }
781 this.file = fileOrCursor;
782 this.input = fileOrCursor.content;
783 this.end = range.endPos;
784 this.state = {
785 peek: -1,
786 offset: range.startPos,
787 line: range.startLine,
788 column: range.startCol,
789 };
790 }
791 }
792 clone() {
793 return new PlainCharacterCursor(this);
794 }
795 peek() {
796 return this.state.peek;
797 }
798 charsLeft() {
799 return this.end - this.state.offset;
800 }
801 diff(other) {
802 return this.state.offset - other.state.offset;
803 }
804 advance() {
805 this.advanceState(this.state);
806 }
807 init() {
808 this.updatePeek(this.state);
809 }
810 getSpan(start, leadingTriviaCodePoints) {
811 start = start || this;
812 let fullStart = start;
813 if (leadingTriviaCodePoints) {
814 while (this.diff(start) > 0 && leadingTriviaCodePoints.indexOf(start.peek()) !== -1) {
815 if (fullStart === start) {
816 start = start.clone();
817 }
818 start.advance();
819 }
820 }
821 const startLocation = this.locationFromCursor(start);
822 const endLocation = this.locationFromCursor(this);
823 const fullStartLocation = fullStart !== start ? this.locationFromCursor(fullStart) : startLocation;
824 return new ParseSourceSpan(startLocation, endLocation, fullStartLocation);
825 }
826 getChars(start) {
827 return this.input.substring(start.state.offset, this.state.offset);
828 }
829 charAt(pos) {
830 return this.input.charCodeAt(pos);
831 }
832 advanceState(state) {
833 if (state.offset >= this.end) {
834 this.state = state;
835 throw new CursorError('Unexpected character "EOF"', this);
836 }
837 const currentChar = this.charAt(state.offset);
838 if (currentChar === chars.$LF) {
839 state.line++;
840 state.column = 0;
841 }
842 else if (!chars.isNewLine(currentChar)) {
843 state.column++;
844 }
845 state.offset++;
846 this.updatePeek(state);
847 }
848 updatePeek(state) {
849 state.peek = state.offset >= this.end ? chars.$EOF : this.charAt(state.offset);
850 }
851 locationFromCursor(cursor) {
852 return new ParseLocation(cursor.file, cursor.state.offset, cursor.state.line, cursor.state.column);
853 }
854}
855class EscapedCharacterCursor extends PlainCharacterCursor {
856 constructor(fileOrCursor, range) {
857 if (fileOrCursor instanceof EscapedCharacterCursor) {
858 super(fileOrCursor);
859 this.internalState = { ...fileOrCursor.internalState };
860 }
861 else {
862 super(fileOrCursor, range);
863 this.internalState = this.state;
864 }
865 }
866 advance() {
867 this.state = this.internalState;
868 super.advance();
869 this.processEscapeSequence();
870 }
871 init() {
872 super.init();
873 this.processEscapeSequence();
874 }
875 clone() {
876 return new EscapedCharacterCursor(this);
877 }
878 getChars(start) {
879 const cursor = start.clone();
880 let chars = '';
881 while (cursor.internalState.offset < this.internalState.offset) {
882 chars += String.fromCodePoint(cursor.peek());
883 cursor.advance();
884 }
885 return chars;
886 }
887 /**
888 * Process the escape sequence that starts at the current position in the text.
889 *
890 * This method is called to ensure that `peek` has the unescaped value of escape sequences.
891 */
892 processEscapeSequence() {
893 const peek = () => this.internalState.peek;
894 if (peek() === chars.$BACKSLASH) {
895 // We have hit an escape sequence so we need the internal state to become independent
896 // of the external state.
897 this.internalState = { ...this.state };
898 // Move past the backslash
899 this.advanceState(this.internalState);
900 // First check for standard control char sequences
901 if (peek() === chars.$n) {
902 this.state.peek = chars.$LF;
903 }
904 else if (peek() === chars.$r) {
905 this.state.peek = chars.$CR;
906 }
907 else if (peek() === chars.$v) {
908 this.state.peek = chars.$VTAB;
909 }
910 else if (peek() === chars.$t) {
911 this.state.peek = chars.$TAB;
912 }
913 else if (peek() === chars.$b) {
914 this.state.peek = chars.$BSPACE;
915 }
916 else if (peek() === chars.$f) {
917 this.state.peek = chars.$FF;
918 }
919 // Now consider more complex sequences
920 else if (peek() === chars.$u) {
921 // Unicode code-point sequence
922 this.advanceState(this.internalState); // advance past the `u` char
923 if (peek() === chars.$LBRACE) {
924 // Variable length Unicode, e.g. `\x{123}`
925 this.advanceState(this.internalState); // advance past the `{` char
926 // Advance past the variable number of hex digits until we hit a `}` char
927 const digitStart = this.clone();
928 let length = 0;
929 while (peek() !== chars.$RBRACE) {
930 this.advanceState(this.internalState);
931 length++;
932 }
933 this.state.peek = this.decodeHexDigits(digitStart, length);
934 }
935 else {
936 // Fixed length Unicode, e.g. `\u1234`
937 const digitStart = this.clone();
938 this.advanceState(this.internalState);
939 this.advanceState(this.internalState);
940 this.advanceState(this.internalState);
941 this.state.peek = this.decodeHexDigits(digitStart, 4);
942 }
943 }
944 else if (peek() === chars.$x) {
945 // Hex char code, e.g. `\x2F`
946 this.advanceState(this.internalState); // advance past the `x` char
947 const digitStart = this.clone();
948 this.advanceState(this.internalState);
949 this.state.peek = this.decodeHexDigits(digitStart, 2);
950 }
951 else if (chars.isOctalDigit(peek())) {
952 // Octal char code, e.g. `\012`,
953 let octal = '';
954 let length = 0;
955 let previous = this.clone();
956 while (chars.isOctalDigit(peek()) && length < 3) {
957 previous = this.clone();
958 octal += String.fromCodePoint(peek());
959 this.advanceState(this.internalState);
960 length++;
961 }
962 this.state.peek = parseInt(octal, 8);
963 // Backup one char
964 this.internalState = previous.internalState;
965 }
966 else if (chars.isNewLine(this.internalState.peek)) {
967 // Line continuation `\` followed by a new line
968 this.advanceState(this.internalState); // advance over the newline
969 this.state = this.internalState;
970 }
971 else {
972 // If none of the `if` blocks were executed then we just have an escaped normal character.
973 // In that case we just, effectively, skip the backslash from the character.
974 this.state.peek = this.internalState.peek;
975 }
976 }
977 }
978 decodeHexDigits(start, length) {
979 const hex = this.input.substr(start.internalState.offset, length);
980 const charCode = parseInt(hex, 16);
981 if (!isNaN(charCode)) {
982 return charCode;
983 }
984 else {
985 start.state = start.internalState;
986 throw new CursorError('Invalid hexadecimal escape sequence', start);
987 }
988 }
989}
990export class CursorError {
991 constructor(msg, cursor) {
992 this.msg = msg;
993 this.cursor = cursor;
994 }
995}
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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 * as chars from '../chars';\nimport {ParseError, ParseLocation, ParseSourceFile, ParseSourceSpan} from '../parse_util';\n\nimport {NAMED_ENTITIES} from './entities';\nimport {DEFAULT_INTERPOLATION_CONFIG, InterpolationConfig} from './interpolation_config';\nimport {TagContentType, TagDefinition} from './tags';\nimport {IncompleteTagOpenToken, TagOpenStartToken, Token, TokenType} from './tokens';\n\nexport class TokenError extends ParseError {\n  constructor(errorMsg: string, public tokenType: TokenType|null, span: ParseSourceSpan) {\n    super(span, errorMsg);\n  }\n}\n\nexport class TokenizeResult {\n  constructor(\n      public tokens: Token[], public errors: TokenError[],\n      public nonNormalizedIcuExpressions: Token[]) {}\n}\n\nexport interface LexerRange {\n  startPos: number;\n  startLine: number;\n  startCol: number;\n  endPos: number;\n}\n\n/**\n * Options that modify how the text is tokenized.\n */\nexport interface TokenizeOptions {\n  /** Whether to tokenize ICU messages (considered as text nodes when false). */\n  tokenizeExpansionForms?: boolean;\n  /** How to tokenize interpolation markers. */\n  interpolationConfig?: InterpolationConfig;\n  /**\n   * The start and end point of the text to parse within the `source` string.\n   * The entire `source` string is parsed if this is not provided.\n   * */\n  range?: LexerRange;\n  /**\n   * If this text is stored in a JavaScript string, then we have to deal with escape sequences.\n   *\n   * **Example 1:**\n   *\n   * ```\n   * \"abc\\\"def\\nghi\"\n   * ```\n   *\n   * - The `\\\"` must be converted to `\"`.\n   * - The `\\n` must be converted to a new line character in a token,\n   *   but it should not increment the current line for source mapping.\n   *\n   * **Example 2:**\n   *\n   * ```\n   * \"abc\\\n   *  def\"\n   * ```\n   *\n   * The line continuation (`\\` followed by a newline) should be removed from a token\n   * but the new line should increment the current line for source mapping.\n   */\n  escapedString?: boolean;\n  /**\n   * If this text is stored in an external template (e.g. via `templateUrl`) then we need to decide\n   * whether or not to normalize the line-endings (from `\\r\\n` to `\\n`) when processing ICU\n   * expressions.\n   *\n   * If `true` then we will normalize ICU expression line endings.\n   * The default is `false`, but this will be switched in a future major release.\n   */\n  i18nNormalizeLineEndingsInICUs?: boolean;\n  /**\n   * An array of characters that should be considered as leading trivia.\n   * Leading trivia are characters that are not important to the developer, and so should not be\n   * included in source-map segments.  A common example is whitespace.\n   */\n  leadingTriviaChars?: string[];\n  /**\n   * If true, do not convert CRLF to LF.\n   */\n  preserveLineEndings?: boolean;\n}\n\nexport function tokenize(\n    source: string, url: string, getTagDefinition: (tagName: string) => TagDefinition,\n    options: TokenizeOptions = {}): TokenizeResult {\n  const tokenizer = new _Tokenizer(new ParseSourceFile(source, url), getTagDefinition, options);\n  tokenizer.tokenize();\n  return new TokenizeResult(\n      mergeTextTokens(tokenizer.tokens), tokenizer.errors, tokenizer.nonNormalizedIcuExpressions);\n}\n\nconst _CR_OR_CRLF_REGEXP = /\\r\\n?/g;\n\nfunction _unexpectedCharacterErrorMsg(charCode: number): string {\n  const char = charCode === chars.$EOF ? 'EOF' : String.fromCharCode(charCode);\n  return `Unexpected character \"${char}\"`;\n}\n\nfunction _unknownEntityErrorMsg(entitySrc: string): string {\n  return `Unknown entity \"${entitySrc}\" - use the \"&#<decimal>;\" or  \"&#x<hex>;\" syntax`;\n}\n\nfunction _unparsableEntityErrorMsg(type: CharacterReferenceType, entityStr: string): string {\n  return `Unable to parse entity \"${entityStr}\" - ${\n      type} character reference entities must end with \";\"`;\n}\n\nenum CharacterReferenceType {\n  HEX = 'hexadecimal',\n  DEC = 'decimal',\n}\n\nclass _ControlFlowError {\n  constructor(public error: TokenError) {}\n}\n\n// See https://www.w3.org/TR/html51/syntax.html#writing-html-documents\nclass _Tokenizer {\n  private _cursor: CharacterCursor;\n  private _tokenizeIcu: boolean;\n  private _interpolationConfig: InterpolationConfig;\n  private _leadingTriviaCodePoints: number[]|undefined;\n  private _currentTokenStart: CharacterCursor|null = null;\n  private _currentTokenType: TokenType|null = null;\n  private _expansionCaseStack: TokenType[] = [];\n  private _inInterpolation: boolean = false;\n  private readonly _preserveLineEndings: boolean;\n  private readonly _escapedString: boolean;\n  private readonly _i18nNormalizeLineEndingsInICUs: boolean;\n  tokens: Token[] = [];\n  errors: TokenError[] = [];\n  nonNormalizedIcuExpressions: Token[] = [];\n\n  /**\n   * @param _file The html source file being tokenized.\n   * @param _getTagDefinition A function that will retrieve a tag definition for a given tag name.\n   * @param options Configuration of the tokenization.\n   */\n  constructor(\n      _file: ParseSourceFile, private _getTagDefinition: (tagName: string) => TagDefinition,\n      options: TokenizeOptions) {\n    this._tokenizeIcu = options.tokenizeExpansionForms || false;\n    this._interpolationConfig = options.interpolationConfig || DEFAULT_INTERPOLATION_CONFIG;\n    this._leadingTriviaCodePoints =\n        options.leadingTriviaChars && options.leadingTriviaChars.map(c => c.codePointAt(0) || 0);\n    const range =\n        options.range || {endPos: _file.content.length, startPos: 0, startLine: 0, startCol: 0};\n    this._cursor = options.escapedString ? new EscapedCharacterCursor(_file, range) :\n                                           new PlainCharacterCursor(_file, range);\n    this._preserveLineEndings = options.preserveLineEndings || false;\n    this._escapedString = options.escapedString || false;\n    this._i18nNormalizeLineEndingsInICUs = options.i18nNormalizeLineEndingsInICUs || false;\n    try {\n      this._cursor.init();\n    } catch (e) {\n      this.handleError(e);\n    }\n  }\n\n  private _processCarriageReturns(content: string): string {\n    if (this._preserveLineEndings) {\n      return content;\n    }\n    // https://www.w3.org/TR/html51/syntax.html#preprocessing-the-input-stream\n    // In order to keep the original position in the source, we can not\n    // pre-process it.\n    // Instead CRs are processed right before instantiating the tokens.\n    return content.replace(_CR_OR_CRLF_REGEXP, '\\n');\n  }\n\n  tokenize(): void {\n    while (this._cursor.peek() !== chars.$EOF) {\n      const start = this._cursor.clone();\n      try {\n        if (this._attemptCharCode(chars.$LT)) {\n          if (this._attemptCharCode(chars.$BANG)) {\n            if (this._attemptCharCode(chars.$LBRACKET)) {\n              this._consumeCdata(start);\n            } else if (this._attemptCharCode(chars.$MINUS)) {\n              this._consumeComment(start);\n            } else {\n              this._consumeDocType(start);\n            }\n          } else if (this._attemptCharCode(chars.$SLASH)) {\n            this._consumeTagClose(start);\n          } else {\n            this._consumeTagOpen(start);\n          }\n        } else if (!(this._tokenizeIcu && this._tokenizeExpansionForm())) {\n          // In (possibly interpolated) text the end of the text is given by `isTextEnd()`, while\n          // the premature end of an interpolation is given by the start of a new HTML element.\n          this._consumeWithInterpolation(\n              TokenType.TEXT, TokenType.INTERPOLATION, () => this._isTextEnd(),\n              () => this._isTagStart());\n        }\n      } catch (e) {\n        this.handleError(e);\n      }\n    }\n    this._beginToken(TokenType.EOF);\n    this._endToken([]);\n  }\n\n  /**\n   * @returns whether an ICU token has been created\n   * @internal\n   */\n  private _tokenizeExpansionForm(): boolean {\n    if (this.isExpansionFormStart()) {\n      this._consumeExpansionFormStart();\n      return true;\n    }\n\n    if (isExpansionCaseStart(this._cursor.peek()) && this._isInExpansionForm()) {\n      this._consumeExpansionCaseStart();\n      return true;\n    }\n\n    if (this._cursor.peek() === chars.$RBRACE) {\n      if (this._isInExpansionCase()) {\n        this._consumeExpansionCaseEnd();\n        return true;\n      }\n\n      if (this._isInExpansionForm()) {\n        this._consumeExpansionFormEnd();\n        return true;\n      }\n    }\n\n    return false;\n  }\n\n  private _beginToken(type: TokenType, start = this._cursor.clone()) {\n    this._currentTokenStart = start;\n    this._currentTokenType = type;\n  }\n\n  private _endToken(parts: string[], end?: CharacterCursor): Token {\n    if (this._currentTokenStart === null) {\n      throw new TokenError(\n          'Programming error - attempted to end a token when there was no start to the token',\n          this._currentTokenType, this._cursor.getSpan(end));\n    }\n    if (this._currentTokenType === null) {\n      throw new TokenError(\n          'Programming error - attempted to end a token which has no token type', null,\n          this._cursor.getSpan(this._currentTokenStart));\n    }\n    const token = {\n      type: this._currentTokenType,\n      parts,\n      sourceSpan:\n          (end ?? this._cursor).getSpan(this._currentTokenStart, this._leadingTriviaCodePoints),\n    } as Token;\n    this.tokens.push(token);\n    this._currentTokenStart = null;\n    this._currentTokenType = null;\n    return token;\n  }\n\n  private _createError(msg: string, span: ParseSourceSpan): _ControlFlowError {\n    if (this._isInExpansionForm()) {\n      msg += ` (Do you have an unescaped \"{\" in your template? Use \"{{ '{' }}\") to escape it.)`;\n    }\n    const error = new TokenError(msg, this._currentTokenType, span);\n    this._currentTokenStart = null;\n    this._currentTokenType = null;\n    return new _ControlFlowError(error);\n  }\n\n  private handleError(e: any) {\n    if (e instanceof CursorError) {\n      e = this._createError(e.msg, this._cursor.getSpan(e.cursor));\n    }\n    if (e instanceof _ControlFlowError) {\n      this.errors.push(e.error);\n    } else {\n      throw e;\n    }\n  }\n\n  private _attemptCharCode(charCode: number): boolean {\n    if (this._cursor.peek() === charCode) {\n      this._cursor.advance();\n      return true;\n    }\n    return false;\n  }\n\n  private _attemptCharCodeCaseInsensitive(charCode: number): boolean {\n    if (compareCharCodeCaseInsensitive(this._cursor.peek(), charCode)) {\n      this._cursor.advance();\n      return true;\n    }\n    return false;\n  }\n\n  private _requireCharCode(charCode: number) {\n    const location = this._cursor.clone();\n    if (!this._attemptCharCode(charCode)) {\n      throw this._createError(\n          _unexpectedCharacterErrorMsg(this._cursor.peek()), this._cursor.getSpan(location));\n    }\n  }\n\n  private _attemptStr(chars: string): boolean {\n    const len = chars.length;\n    if (this._cursor.charsLeft() < len) {\n      return false;\n    }\n    const initialPosition = this._cursor.clone();\n    for (let i = 0; i < len; i++) {\n      if (!this._attemptCharCode(chars.charCodeAt(i))) {\n        // If attempting to parse the string fails, we want to reset the parser\n        // to where it was before the attempt\n        this._cursor = initialPosition;\n        return false;\n      }\n    }\n    return true;\n  }\n\n  private _attemptStrCaseInsensitive(chars: string): boolean {\n    for (let i = 0; i < chars.length; i++) {\n      if (!this._attemptCharCodeCaseInsensitive(chars.charCodeAt(i))) {\n        return false;\n      }\n    }\n    return true;\n  }\n\n  private _requireStr(chars: string) {\n    const location = this._cursor.clone();\n    if (!this._attemptStr(chars)) {\n      throw this._createError(\n          _unexpectedCharacterErrorMsg(this._cursor.peek()), this._cursor.getSpan(location));\n    }\n  }\n\n  private _attemptCharCodeUntilFn(predicate: (code: number) => boolean) {\n    while (!predicate(this._cursor.peek())) {\n      this._cursor.advance();\n    }\n  }\n\n  private _requireCharCodeUntilFn(predicate: (code: number) => boolean, len: number) {\n    const start = this._cursor.clone();\n    this._attemptCharCodeUntilFn(predicate);\n    if (this._cursor.diff(start) < len) {\n      throw this._createError(\n          _unexpectedCharacterErrorMsg(this._cursor.peek()), this._cursor.getSpan(start));\n    }\n  }\n\n  private _attemptUntilChar(char: number) {\n    while (this._cursor.peek() !== char) {\n      this._cursor.advance();\n    }\n  }\n\n  private _readChar(): string {\n    // Don't rely upon reading directly from `_input` as the actual char value\n    // may have been generated from an escape sequence.\n    const char = String.fromCodePoint(this._cursor.peek());\n    this._cursor.advance();\n    return char;\n  }\n\n  private _consumeEntity(textTokenType: TokenType): void {\n    this._beginToken(TokenType.ENCODED_ENTITY);\n    const start = this._cursor.clone();\n    this._cursor.advance();\n    if (this._attemptCharCode(chars.$HASH)) {\n      const isHex = this._attemptCharCode(chars.$x) || this._attemptCharCode(chars.$X);\n      const codeStart = this._cursor.clone();\n      this._attemptCharCodeUntilFn(isDigitEntityEnd);\n      if (this._cursor.peek() != chars.$SEMICOLON) {\n        // Advance cursor to include the peeked character in the string provided to the error\n        // message.\n        this._cursor.advance();\n        const entityType = isHex ? CharacterReferenceType.HEX : CharacterReferenceType.DEC;\n        throw this._createError(\n            _unparsableEntityErrorMsg(entityType, this._cursor.getChars(start)),\n            this._cursor.getSpan());\n      }\n      const strNum = this._cursor.getChars(codeStart);\n      this._cursor.advance();\n      try {\n        const charCode = parseInt(strNum, isHex ? 16 : 10);\n        this._endToken([String.fromCharCode(charCode), this._cursor.getChars(start)]);\n      } catch {\n        throw this._createError(\n            _unknownEntityErrorMsg(this._cursor.getChars(start)), this._cursor.getSpan());\n      }\n    } else {\n      const nameStart = this._cursor.clone();\n      this._attemptCharCodeUntilFn(isNamedEntityEnd);\n      if (this._cursor.peek() != chars.$SEMICOLON) {\n        // No semicolon was found so abort the encoded entity token that was in progress, and treat\n        // this as a text token\n        this._beginToken(textTokenType, start);\n        this._cursor = nameStart;\n        this._endToken(['&']);\n      } else {\n        const name = this._cursor.getChars(nameStart);\n        this._cursor.advance();\n        const char = NAMED_ENTITIES[name];\n        if (!char) {\n          throw this._createError(_unknownEntityErrorMsg(name), this._cursor.getSpan(start));\n        }\n        this._endToken([char, `&${name};`]);\n      }\n    }\n  }\n\n  private _consumeRawText(consumeEntities: boolean, endMarkerPredicate: () => boolean): void {\n    this._beginToken(consumeEntities ? TokenType.ESCAPABLE_RAW_TEXT : TokenType.RAW_TEXT);\n    const parts: string[] = [];\n    while (true) {\n      const tagCloseStart = this._cursor.clone();\n      const foundEndMarker = endMarkerPredicate();\n      this._cursor = tagCloseStart;\n      if (foundEndMarker) {\n        break;\n      }\n      if (consumeEntities && this._cursor.peek() === chars.$AMPERSAND) {\n        this._endToken([this._processCarriageReturns(parts.join(''))]);\n        parts.length = 0;\n        this._consumeEntity(TokenType.ESCAPABLE_RAW_TEXT);\n        this._beginToken(TokenType.ESCAPABLE_RAW_TEXT);\n      } else {\n        parts.push(this._readChar());\n      }\n    }\n    this._endToken([this._processCarriageReturns(parts.join(''))]);\n  }\n\n  private _consumeComment(start: CharacterCursor) {\n    this._beginToken(TokenType.COMMENT_START, start);\n    this._requireCharCode(chars.$MINUS);\n    this._endToken([]);\n    this._consumeRawText(false, () => this._attemptStr('-->'));\n    this._beginToken(TokenType.COMMENT_END);\n    this._requireStr('-->');\n    this._endToken([]);\n  }\n\n  private _consumeCdata(start: CharacterCursor) {\n    this._beginToken(TokenType.CDATA_START, start);\n    this._requireStr('CDATA[');\n    this._endToken([]);\n    this._consumeRawText(false, () => this._attemptStr(']]>'));\n    this._beginToken(TokenType.CDATA_END);\n    this._requireStr(']]>');\n    this._endToken([]);\n  }\n\n  private _consumeDocType(start: CharacterCursor) {\n    this._beginToken(TokenType.DOC_TYPE, start);\n    const contentStart = this._cursor.clone();\n    this._attemptUntilChar(chars.$GT);\n    const content = this._cursor.getChars(contentStart);\n    this._cursor.advance();\n    this._endToken([content]);\n  }\n\n  private _consumePrefixAndName(): string[] {\n    const nameOrPrefixStart = this._cursor.clone();\n    let prefix: string = '';\n    while (this._cursor.peek() !== chars.$COLON && !isPrefixEnd(this._cursor.peek())) {\n      this._cursor.advance();\n    }\n    let nameStart: CharacterCursor;\n    if (this._cursor.peek() === chars.$COLON) {\n      prefix = this._cursor.getChars(nameOrPrefixStart);\n      this._cursor.advance();\n      nameStart = this._cursor.clone();\n    } else {\n      nameStart = nameOrPrefixStart;\n    }\n    this._requireCharCodeUntilFn(isNameEnd, prefix === '' ? 0 : 1);\n    const name = this._cursor.getChars(nameStart);\n    return [prefix, name];\n  }\n\n  private _consumeTagOpen(start: CharacterCursor) {\n    let tagName: string;\n    let prefix: string;\n    let openTagToken: TagOpenStartToken|IncompleteTagOpenToken|undefined;\n    try {\n      if (!chars.isAsciiLetter(this._cursor.peek())) {\n        throw this._createError(\n            _unexpectedCharacterErrorMsg(this._cursor.peek()), this._cursor.getSpan(start));\n      }\n\n      openTagToken = this._consumeTagOpenStart(start);\n      prefix = openTagToken.parts[0];\n      tagName = openTagToken.parts[1];\n      this._attemptCharCodeUntilFn(isNotWhitespace);\n      while (this._cursor.peek() !== chars.$SLASH && this._cursor.peek() !== chars.$GT &&\n             this._cursor.peek() !== chars.$LT && this._cursor.peek() !== chars.$EOF) {\n        this._consumeAttributeName();\n        this._attemptCharCodeUntilFn(isNotWhitespace);\n        if (this._attemptCharCode(chars.$EQ)) {\n          this._attemptCharCodeUntilFn(isNotWhitespace);\n          this._consumeAttributeValue();\n        }\n        this._attemptCharCodeUntilFn(isNotWhitespace);\n      }\n      this._consumeTagOpenEnd();\n    } catch (e) {\n      if (e instanceof _ControlFlowError) {\n        if (openTagToken) {\n          // We errored before we could close the opening tag, so it is incomplete.\n          openTagToken.type = TokenType.INCOMPLETE_TAG_OPEN;\n        } else {\n          // When the start tag is invalid, assume we want a \"<\" as text.\n          // Back to back text tokens are merged at the end.\n          this._beginToken(TokenType.TEXT, start);\n          this._endToken(['<']);\n        }\n        return;\n      }\n\n      throw e;\n    }\n\n    const contentTokenType = this._getTagDefinition(tagName).getContentType(prefix);\n\n    if (contentTokenType === TagContentType.RAW_TEXT) {\n      this._consumeRawTextWithTagClose(prefix, tagName, false);\n    } else if (contentTokenType === TagContentType.ESCAPABLE_RAW_TEXT) {\n      this._consumeRawTextWithTagClose(prefix, tagName, true);\n    }\n  }\n\n  private _consumeRawTextWithTagClose(prefix: string, tagName: string, consumeEntities: boolean) {\n    this._consumeRawText(consumeEntities, () => {\n      if (!this._attemptCharCode(chars.$LT)) return false;\n      if (!this._attemptCharCode(chars.$SLASH)) return false;\n      this._attemptCharCodeUntilFn(isNotWhitespace);\n      if (!this._attemptStrCaseInsensitive(tagName)) return false;\n      this._attemptCharCodeUntilFn(isNotWhitespace);\n      return this._attemptCharCode(chars.$GT);\n    });\n    this._beginToken(TokenType.TAG_CLOSE);\n    this._requireCharCodeUntilFn(code => code === chars.$GT, 3);\n    this._cursor.advance();  // Consume the `>`\n    this._endToken([prefix, tagName]);\n  }\n\n  private _consumeTagOpenStart(start: CharacterCursor): TagOpenStartToken {\n    this._beginToken(TokenType.TAG_OPEN_START, start);\n    const parts = this._consumePrefixAndName();\n    return this._endToken(parts) as TagOpenStartToken;\n  }\n\n  private _consumeAttributeName() {\n    const attrNameStart = this._cursor.peek();\n    if (attrNameStart === chars.$SQ || attrNameStart === chars.$DQ) {\n      throw this._createError(_unexpectedCharacterErrorMsg(attrNameStart), this._cursor.getSpan());\n    }\n    this._beginToken(TokenType.ATTR_NAME);\n    const prefixAndName = this._consumePrefixAndName();\n    this._endToken(prefixAndName);\n  }\n\n  private _consumeAttributeValue() {\n    let value: string;\n    if (this._cursor.peek() === chars.$SQ || this._cursor.peek() === chars.$DQ) {\n      const quoteChar = this._cursor.peek();\n      this._consumeQuote(quoteChar);\n      // In an attribute then end of the attribute value and the premature end to an interpolation\n      // are both triggered by the `quoteChar`.\n      const endPredicate = () => this._cursor.peek() === quoteChar;\n      this._consumeWithInterpolation(\n          TokenType.ATTR_VALUE_TEXT, TokenType.ATTR_VALUE_INTERPOLATION, endPredicate,\n          endPredicate);\n      this._consumeQuote(quoteChar);\n    } else {\n      const endPredicate = () => isNameEnd(this._cursor.peek());\n      this._consumeWithInterpolation(\n          TokenType.ATTR_VALUE_TEXT, TokenType.ATTR_VALUE_INTERPOLATION, endPredicate,\n          endPredicate);\n    }\n  }\n\n  private _consumeQuote(quoteChar: number) {\n    this._beginToken(TokenType.ATTR_QUOTE);\n    this._requireCharCode(quoteChar);\n    this._endToken([String.fromCodePoint(quoteChar)]);\n  }\n\n  private _consumeTagOpenEnd() {\n    const tokenType =\n        this._attemptCharCode(chars.$SLASH) ? TokenType.TAG_OPEN_END_VOID : TokenType.TAG_OPEN_END;\n    this._beginToken(tokenType);\n    this._requireCharCode(chars.$GT);\n    this._endToken([]);\n  }\n\n  private _consumeTagClose(start: CharacterCursor) {\n    this._beginToken(TokenType.TAG_CLOSE, start);\n    this._attemptCharCodeUntilFn(isNotWhitespace);\n    const prefixAndName = this._consumePrefixAndName();\n    this._attemptCharCodeUntilFn(isNotWhitespace);\n    this._requireCharCode(chars.$GT);\n    this._endToken(prefixAndName);\n  }\n\n  private _consumeExpansionFormStart() {\n    this._beginToken(TokenType.EXPANSION_FORM_START);\n    this._requireCharCode(chars.$LBRACE);\n    this._endToken([]);\n\n    this._expansionCaseStack.push(TokenType.EXPANSION_FORM_START);\n\n    this._beginToken(TokenType.RAW_TEXT);\n    const condition = this._readUntil(chars.$COMMA);\n    const normalizedCondition = this._processCarriageReturns(condition);\n    if (this._i18nNormalizeLineEndingsInICUs) {\n      // We explicitly want to normalize line endings for this text.\n      this._endToken([normalizedCondition]);\n    } else {\n      // We are not normalizing line endings.\n      const conditionToken = this._endToken([condition]);\n      if (normalizedCondition !== condition) {\n        this.nonNormalizedIcuExpressions.push(conditionToken);\n      }\n    }\n    this._requireCharCode(chars.$COMMA);\n    this._attemptCharCodeUntilFn(isNotWhitespace);\n\n    this._beginToken(TokenType.RAW_TEXT);\n    const type = this._readUntil(chars.$COMMA);\n    this._endToken([type]);\n    this._requireCharCode(chars.$COMMA);\n    this._attemptCharCodeUntilFn(isNotWhitespace);\n  }\n\n  private _consumeExpansionCaseStart() {\n    this._beginToken(TokenType.EXPANSION_CASE_VALUE);\n    const value = this._readUntil(chars.$LBRACE).trim();\n    this._endToken([value]);\n    this._attemptCharCodeUntilFn(isNotWhitespace);\n\n    this._beginToken(TokenType.EXPANSION_CASE_EXP_START);\n    this._requireCharCode(chars.$LBRACE);\n    this._endToken([]);\n    this._attemptCharCodeUntilFn(isNotWhitespace);\n\n    this._expansionCaseStack.push(TokenType.EXPANSION_CASE_EXP_START);\n  }\n\n  private _consumeExpansionCaseEnd() {\n    this._beginToken(TokenType.EXPANSION_CASE_EXP_END);\n    this._requireCharCode(chars.$RBRACE);\n    this._endToken([]);\n    this._attemptCharCodeUntilFn(isNotWhitespace);\n\n    this._expansionCaseStack.pop();\n  }\n\n  private _consumeExpansionFormEnd() {\n    this._beginToken(TokenType.EXPANSION_FORM_END);\n    this._requireCharCode(chars.$RBRACE);\n    this._endToken([]);\n\n    this._expansionCaseStack.pop();\n  }\n\n  /**\n   * Consume a string that may contain interpolation expressions.\n   *\n   * The first token consumed will be of `tokenType` and then there will be alternating\n   * `interpolationTokenType` and `tokenType` tokens until the `endPredicate()` returns true.\n   *\n   * If an interpolation token ends prematurely it will have no end marker in its `parts` array.\n   *\n   * @param textTokenType the kind of tokens to interleave around interpolation tokens.\n   * @param interpolationTokenType the kind of tokens that contain interpolation.\n   * @param endPredicate a function that should return true when we should stop consuming.\n   * @param endInterpolation a function that should return true if there is a premature end to an\n   *     interpolation expression - i.e. before we get to the normal interpolation closing marker.\n   */\n  private _consumeWithInterpolation(\n      textTokenType: TokenType, interpolationTokenType: TokenType, endPredicate: () => boolean,\n      endInterpolation: () => boolean) {\n    this._beginToken(textTokenType);\n    const parts: string[] = [];\n\n    while (!endPredicate()) {\n      const current = this._cursor.clone();\n      if (this._interpolationConfig && this._attemptStr(this._interpolationConfig.start)) {\n        this._endToken([this._processCarriageReturns(parts.join(''))], current);\n        parts.length = 0;\n        this._consumeInterpolation(interpolationTokenType, current, endInterpolation);\n        this._beginToken(textTokenType);\n      } else if (this._cursor.peek() === chars.$AMPERSAND) {\n        this._endToken([this._processCarriageReturns(parts.join(''))]);\n        parts.length = 0;\n        this._consumeEntity(textTokenType);\n        this._beginToken(textTokenType);\n      } else {\n        parts.push(this._readChar());\n      }\n    }\n\n    // It is possible that an interpolation was started but not ended inside this text token.\n    // Make sure that we reset the state of the lexer correctly.\n    this._inInterpolation = false;\n\n    this._endToken([this._processCarriageReturns(parts.join(''))]);\n  }\n\n  /**\n   * Consume a block of text that has been interpreted as an Angular interpolation.\n   *\n   * @param interpolationTokenType the type of the interpolation token to generate.\n   * @param interpolationStart a cursor that points to the start of this interpolation.\n   * @param prematureEndPredicate a function that should return true if the next characters indicate\n   *     an end to the interpolation before its normal closing marker.\n   */\n  private _consumeInterpolation(\n      interpolationTokenType: TokenType, interpolationStart: CharacterCursor,\n      prematureEndPredicate: (() => boolean)|null): void {\n    const parts: string[] = [];\n    this._beginToken(interpolationTokenType, interpolationStart);\n    parts.push(this._interpolationConfig.start);\n\n    // Find the end of the interpolation, ignoring content inside quotes.\n    const expressionStart = this._cursor.clone();\n    let inQuote: number|null = null;\n    let inComment = false;\n    while (this._cursor.peek() !== chars.$EOF &&\n           (prematureEndPredicate === null || !prematureEndPredicate())) {\n      const current = this._cursor.clone();\n\n      if (this._isTagStart()) {\n        // We are starting what looks like an HTML element in the middle of this interpolation.\n        // Reset the cursor to before the `<` character and end the interpolation token.\n        // (This is actually wrong but here for backward compatibility).\n        this._cursor = current;\n        parts.push(this._getProcessedChars(expressionStart, current));\n        this._endToken(parts);\n        return;\n      }\n\n      if (inQuote === null) {\n        if (this._attemptStr(this._interpolationConfig.end)) {\n          // We are not in a string, and we hit the end interpolation marker\n          parts.push(this._getProcessedChars(expressionStart, current));\n          parts.push(this._interpolationConfig.end);\n          this._endToken(parts);\n          return;\n        } else if (this._attemptStr('//')) {\n          // Once we are in a comment we ignore any quotes\n          inComment = true;\n        }\n      }\n\n      const char = this._cursor.peek();\n      this._cursor.advance();\n      if (char === chars.$BACKSLASH) {\n        // Skip the next character because it was escaped.\n        this._cursor.advance();\n      } else if (char === inQuote) {\n        // Exiting the current quoted string\n        inQuote = null;\n      } else if (!inComment && inQuote === null && chars.isQuote(char)) {\n        // Entering a new quoted string\n        inQuote = char;\n      }\n    }\n\n    // We hit EOF without finding a closing interpolation marker\n    parts.push(this._getProcessedChars(expressionStart, this._cursor));\n    this._endToken(parts);\n  }\n\n  private _getProcessedChars(start: CharacterCursor, end: CharacterCursor): string {\n    return this._processCarriageReturns(end.getChars(start));\n  }\n\n  private _isTextEnd(): boolean {\n    if (this._isTagStart() || this._cursor.peek() === chars.$EOF) {\n      return true;\n    }\n\n    if (this._tokenizeIcu && !this._inInterpolation) {\n      if (this.isExpansionFormStart()) {\n        // start of an expansion form\n        return true;\n      }\n\n      if (this._cursor.peek() === chars.$RBRACE && this._isInExpansionCase()) {\n        // end of and expansion case\n        return true;\n      }\n    }\n\n    return false;\n  }\n\n  /**\n   * Returns true if the current cursor is pointing to the start of a tag\n   * (opening/closing/comments/cdata/etc).\n   */\n  private _isTagStart(): boolean {\n    if (this._cursor.peek() === chars.$LT) {\n      // We assume that `<` followed by whitespace is not the start of an HTML element.\n      const tmp = this._cursor.clone();\n      tmp.advance();\n      // If the next character is alphabetic, ! nor / then it is a tag start\n      const code = tmp.peek();\n      if ((chars.$a <= code && code <= chars.$z) || (chars.$A <= code && code <= chars.$Z) ||\n          code === chars.$SLASH || code === chars.$BANG) {\n        return true;\n      }\n    }\n    return false;\n  }\n\n  private _readUntil(char: number): string {\n    const start = this._cursor.clone();\n    this._attemptUntilChar(char);\n    return this._cursor.getChars(start);\n  }\n\n  private _isInExpansionCase(): boolean {\n    return this._expansionCaseStack.length > 0 &&\n        this._expansionCaseStack[this._expansionCaseStack.length - 1] ===\n        TokenType.EXPANSION_CASE_EXP_START;\n  }\n\n  private _isInExpansionForm(): boolean {\n    return this._expansionCaseStack.length > 0 &&\n        this._expansionCaseStack[this._expansionCaseStack.length - 1] ===\n        TokenType.EXPANSION_FORM_START;\n  }\n\n  private isExpansionFormStart(): boolean {\n    if (this._cursor.peek() !== chars.$LBRACE) {\n      return false;\n    }\n    if (this._interpolationConfig) {\n      const start = this._cursor.clone();\n      const isInterpolation = this._attemptStr(this._interpolationConfig.start);\n      this._cursor = start;\n      return !isInterpolation;\n    }\n    return true;\n  }\n}\n\nfunction isNotWhitespace(code: number): boolean {\n  return !chars.isWhitespace(code) || code === chars.$EOF;\n}\n\nfunction isNameEnd(code: number): boolean {\n  return chars.isWhitespace(code) || code === chars.$GT || code === chars.$LT ||\n      code === chars.$SLASH || code === chars.$SQ || code === chars.$DQ || code === chars.$EQ ||\n      code === chars.$EOF;\n}\n\nfunction isPrefixEnd(code: number): boolean {\n  return (code < chars.$a || chars.$z < code) && (code < chars.$A || chars.$Z < code) &&\n      (code < chars.$0 || code > chars.$9);\n}\n\nfunction isDigitEntityEnd(code: number): boolean {\n  return code === chars.$SEMICOLON || code === chars.$EOF || !chars.isAsciiHexDigit(code);\n}\n\nfunction isNamedEntityEnd(code: number): boolean {\n  return code === chars.$SEMICOLON || code === chars.$EOF || !chars.isAsciiLetter(code);\n}\n\nfunction isExpansionCaseStart(peek: number): boolean {\n  return peek !== chars.$RBRACE;\n}\n\nfunction compareCharCodeCaseInsensitive(code1: number, code2: number): boolean {\n  return toUpperCaseCharCode(code1) === toUpperCaseCharCode(code2);\n}\n\nfunction toUpperCaseCharCode(code: number): number {\n  return code >= chars.$a && code <= chars.$z ? code - chars.$a + chars.$A : code;\n}\n\nfunction mergeTextTokens(srcTokens: Token[]): Token[] {\n  const dstTokens: Token[] = [];\n  let lastDstToken: Token|undefined = undefined;\n  for (let i = 0; i < srcTokens.length; i++) {\n    const token = srcTokens[i];\n    if ((lastDstToken && lastDstToken.type === TokenType.TEXT && token.type === TokenType.TEXT) ||\n        (lastDstToken && lastDstToken.type === TokenType.ATTR_VALUE_TEXT &&\n         token.type === TokenType.ATTR_VALUE_TEXT)) {\n      lastDstToken.parts[0]! += token.parts[0];\n      lastDstToken.sourceSpan.end = token.sourceSpan.end;\n    } else {\n      lastDstToken = token;\n      dstTokens.push(lastDstToken);\n    }\n  }\n\n  return dstTokens;\n}\n\n\n/**\n * The _Tokenizer uses objects of this type to move through the input text,\n * extracting \"parsed characters\". These could be more than one actual character\n * if the text contains escape sequences.\n */\ninterface CharacterCursor {\n  /** Initialize the cursor. */\n  init(): void;\n  /** The parsed character at the current cursor position. */\n  peek(): number;\n  /** Advance the cursor by one parsed character. */\n  advance(): void;\n  /** Get a span from the marked start point to the current point. */\n  getSpan(start?: this, leadingTriviaCodePoints?: number[]): ParseSourceSpan;\n  /** Get the parsed characters from the marked start point to the current point. */\n  getChars(start: this): string;\n  /** The number of characters left before the end of the cursor. */\n  charsLeft(): number;\n  /** The number of characters between `this` cursor and `other` cursor. */\n  diff(other: this): number;\n  /** Make a copy of this cursor */\n  clone(): CharacterCursor;\n}\n\ninterface CursorState {\n  peek: number;\n  offset: number;\n  line: number;\n  column: number;\n}\n\nclass PlainCharacterCursor implements CharacterCursor {\n  protected state: CursorState;\n  protected file: ParseSourceFile;\n  protected input: string;\n  protected end: number;\n\n  constructor(fileOrCursor: PlainCharacterCursor);\n  constructor(fileOrCursor: ParseSourceFile, range: LexerRange);\n  constructor(fileOrCursor: ParseSourceFile|PlainCharacterCursor, range?: LexerRange) {\n    if (fileOrCursor instanceof PlainCharacterCursor) {\n      this.file = fileOrCursor.file;\n      this.input = fileOrCursor.input;\n      this.end = fileOrCursor.end;\n\n      const state = fileOrCursor.state;\n      // Note: avoid using `{...fileOrCursor.state}` here as that has a severe performance penalty.\n      // In ES5 bundles the object spread operator is translated into the `__assign` helper, which\n      // is not optimized by VMs as efficiently as a raw object literal. Since this constructor is\n      // called in tight loops, this difference matters.\n      this.state = {\n        peek: state.peek,\n        offset: state.offset,\n        line: state.line,\n        column: state.column,\n      };\n    } else {\n      if (!range) {\n        throw new Error(\n            'Programming error: the range argument must be provided with a file argument.');\n      }\n      this.file = fileOrCursor;\n      this.input = fileOrCursor.content;\n      this.end = range.endPos;\n      this.state = {\n        peek: -1,\n        offset: range.startPos,\n        line: range.startLine,\n        column: range.startCol,\n      };\n    }\n  }\n\n  clone(): PlainCharacterCursor {\n    return new PlainCharacterCursor(this);\n  }\n\n  peek() {\n    return this.state.peek;\n  }\n  charsLeft() {\n    return this.end - this.state.offset;\n  }\n  diff(other: this) {\n    return this.state.offset - other.state.offset;\n  }\n\n  advance(): void {\n    this.advanceState(this.state);\n  }\n\n  init(): void {\n    this.updatePeek(this.state);\n  }\n\n  getSpan(start?: this, leadingTriviaCodePoints?: number[]): ParseSourceSpan {\n    start = start || this;\n    let fullStart = start;\n    if (leadingTriviaCodePoints) {\n      while (this.diff(start) > 0 && leadingTriviaCodePoints.indexOf(start.peek()) !== -1) {\n        if (fullStart === start) {\n          start = start.clone() as this;\n        }\n        start.advance();\n      }\n    }\n    const startLocation = this.locationFromCursor(start);\n    const endLocation = this.locationFromCursor(this);\n    const fullStartLocation =\n        fullStart !== start ? this.locationFromCursor(fullStart) : startLocation;\n    return new ParseSourceSpan(startLocation, endLocation, fullStartLocation);\n  }\n\n  getChars(start: this): string {\n    return this.input.substring(start.state.offset, this.state.offset);\n  }\n\n  charAt(pos: number): number {\n    return this.input.charCodeAt(pos);\n  }\n\n  protected advanceState(state: CursorState) {\n    if (state.offset >= this.end) {\n      this.state = state;\n      throw new CursorError('Unexpected character \"EOF\"', this);\n    }\n    const currentChar = this.charAt(state.offset);\n    if (currentChar === chars.$LF) {\n      state.line++;\n      state.column = 0;\n    } else if (!chars.isNewLine(currentChar)) {\n      state.column++;\n    }\n    state.offset++;\n    this.updatePeek(state);\n  }\n\n  protected updatePeek(state: CursorState): void {\n    state.peek = state.offset >= this.end ? chars.$EOF : this.charAt(state.offset);\n  }\n\n  private locationFromCursor(cursor: this): ParseLocation {\n    return new ParseLocation(\n        cursor.file, cursor.state.offset, cursor.state.line, cursor.state.column);\n  }\n}\n\nclass EscapedCharacterCursor extends PlainCharacterCursor {\n  protected internalState: CursorState;\n\n  constructor(fileOrCursor: EscapedCharacterCursor);\n  constructor(fileOrCursor: ParseSourceFile, range: LexerRange);\n  constructor(fileOrCursor: ParseSourceFile|EscapedCharacterCursor, range?: LexerRange) {\n    if (fileOrCursor instanceof EscapedCharacterCursor) {\n      super(fileOrCursor);\n      this.internalState = {...fileOrCursor.internalState};\n    } else {\n      super(fileOrCursor, range!);\n      this.internalState = this.state;\n    }\n  }\n\n  override advance(): void {\n    this.state = this.internalState;\n    super.advance();\n    this.processEscapeSequence();\n  }\n\n  override init(): void {\n    super.init();\n    this.processEscapeSequence();\n  }\n\n  override clone(): EscapedCharacterCursor {\n    return new EscapedCharacterCursor(this);\n  }\n\n  override getChars(start: this): string {\n    const cursor = start.clone();\n    let chars = '';\n    while (cursor.internalState.offset < this.internalState.offset) {\n      chars += String.fromCodePoint(cursor.peek());\n      cursor.advance();\n    }\n    return chars;\n  }\n\n  /**\n   * Process the escape sequence that starts at the current position in the text.\n   *\n   * This method is called to ensure that `peek` has the unescaped value of escape sequences.\n   */\n  protected processEscapeSequence(): void {\n    const peek = () => this.internalState.peek;\n\n    if (peek() === chars.$BACKSLASH) {\n      // We have hit an escape sequence so we need the internal state to become independent\n      // of the external state.\n      this.internalState = {...this.state};\n\n      // Move past the backslash\n      this.advanceState(this.internalState);\n\n      // First check for standard control char sequences\n      if (peek() === chars.$n) {\n        this.state.peek = chars.$LF;\n      } else if (peek() === chars.$r) {\n        this.state.peek = chars.$CR;\n      } else if (peek() === chars.$v) {\n        this.state.peek = chars.$VTAB;\n      } else if (peek() === chars.$t) {\n        this.state.peek = chars.$TAB;\n      } else if (peek() === chars.$b) {\n        this.state.peek = chars.$BSPACE;\n      } else if (peek() === chars.$f) {\n        this.state.peek = chars.$FF;\n      }\n\n      // Now consider more complex sequences\n      else if (peek() === chars.$u) {\n        // Unicode code-point sequence\n        this.advanceState(this.internalState);  // advance past the `u` char\n        if (peek() === chars.$LBRACE) {\n          // Variable length Unicode, e.g. `\\x{123}`\n          this.advanceState(this.internalState);  // advance past the `{` char\n          // Advance past the variable number of hex digits until we hit a `}` char\n          const digitStart = this.clone();\n          let length = 0;\n          while (peek() !== chars.$RBRACE) {\n            this.advanceState(this.internalState);\n            length++;\n          }\n          this.state.peek = this.decodeHexDigits(digitStart, length);\n        } else {\n          // Fixed length Unicode, e.g. `\\u1234`\n          const digitStart = this.clone();\n          this.advanceState(this.internalState);\n          this.advanceState(this.internalState);\n          this.advanceState(this.internalState);\n          this.state.peek = this.decodeHexDigits(digitStart, 4);\n        }\n      }\n\n      else if (peek() === chars.$x) {\n        // Hex char code, e.g. `\\x2F`\n        this.advanceState(this.internalState);  // advance past the `x` char\n        const digitStart = this.clone();\n        this.advanceState(this.internalState);\n        this.state.peek = this.decodeHexDigits(digitStart, 2);\n      }\n\n      else if (chars.isOctalDigit(peek())) {\n        // Octal char code, e.g. `\\012`,\n        let octal = '';\n        let length = 0;\n        let previous = this.clone();\n        while (chars.isOctalDigit(peek()) && length < 3) {\n          previous = this.clone();\n          octal += String.fromCodePoint(peek());\n          this.advanceState(this.internalState);\n          length++;\n        }\n        this.state.peek = parseInt(octal, 8);\n        // Backup one char\n        this.internalState = previous.internalState;\n      }\n\n      else if (chars.isNewLine(this.internalState.peek)) {\n        // Line continuation `\\` followed by a new line\n        this.advanceState(this.internalState);  // advance over the newline\n        this.state = this.internalState;\n      }\n\n      else {\n        // If none of the `if` blocks were executed then we just have an escaped normal character.\n        // In that case we just, effectively, skip the backslash from the character.\n        this.state.peek = this.internalState.peek;\n      }\n    }\n  }\n\n  protected decodeHexDigits(start: EscapedCharacterCursor, length: number): number {\n    const hex = this.input.substr(start.internalState.offset, length);\n    const charCode = parseInt(hex, 16);\n    if (!isNaN(charCode)) {\n      return charCode;\n    } else {\n      start.state = start.internalState;\n      throw new CursorError('Invalid hexadecimal escape sequence', start);\n    }\n  }\n}\n\nexport class CursorError {\n  constructor(public msg: string, public cursor: CharacterCursor) {}\n}\n"]}
\No newline at end of file