UNPKG

53.1 kBJavaScriptView Raw
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';
9export var TokenType;
10(function (TokenType) {
11 TokenType[TokenType["Character"] = 0] = "Character";
12 TokenType[TokenType["Identifier"] = 1] = "Identifier";
13 TokenType[TokenType["PrivateIdentifier"] = 2] = "PrivateIdentifier";
14 TokenType[TokenType["Keyword"] = 3] = "Keyword";
15 TokenType[TokenType["String"] = 4] = "String";
16 TokenType[TokenType["Operator"] = 5] = "Operator";
17 TokenType[TokenType["Number"] = 6] = "Number";
18 TokenType[TokenType["Error"] = 7] = "Error";
19})(TokenType || (TokenType = {}));
20const KEYWORDS = ['var', 'let', 'as', 'null', 'undefined', 'true', 'false', 'if', 'else', 'this'];
21export class Lexer {
22 tokenize(text) {
23 const scanner = new _Scanner(text);
24 const tokens = [];
25 let token = scanner.scanToken();
26 while (token != null) {
27 tokens.push(token);
28 token = scanner.scanToken();
29 }
30 return tokens;
31 }
32}
33export class Token {
34 constructor(index, end, type, numValue, strValue) {
35 this.index = index;
36 this.end = end;
37 this.type = type;
38 this.numValue = numValue;
39 this.strValue = strValue;
40 }
41 isCharacter(code) {
42 return this.type == TokenType.Character && this.numValue == code;
43 }
44 isNumber() {
45 return this.type == TokenType.Number;
46 }
47 isString() {
48 return this.type == TokenType.String;
49 }
50 isOperator(operator) {
51 return this.type == TokenType.Operator && this.strValue == operator;
52 }
53 isIdentifier() {
54 return this.type == TokenType.Identifier;
55 }
56 isPrivateIdentifier() {
57 return this.type == TokenType.PrivateIdentifier;
58 }
59 isKeyword() {
60 return this.type == TokenType.Keyword;
61 }
62 isKeywordLet() {
63 return this.type == TokenType.Keyword && this.strValue == 'let';
64 }
65 isKeywordAs() {
66 return this.type == TokenType.Keyword && this.strValue == 'as';
67 }
68 isKeywordNull() {
69 return this.type == TokenType.Keyword && this.strValue == 'null';
70 }
71 isKeywordUndefined() {
72 return this.type == TokenType.Keyword && this.strValue == 'undefined';
73 }
74 isKeywordTrue() {
75 return this.type == TokenType.Keyword && this.strValue == 'true';
76 }
77 isKeywordFalse() {
78 return this.type == TokenType.Keyword && this.strValue == 'false';
79 }
80 isKeywordThis() {
81 return this.type == TokenType.Keyword && this.strValue == 'this';
82 }
83 isError() {
84 return this.type == TokenType.Error;
85 }
86 toNumber() {
87 return this.type == TokenType.Number ? this.numValue : -1;
88 }
89 toString() {
90 switch (this.type) {
91 case TokenType.Character:
92 case TokenType.Identifier:
93 case TokenType.Keyword:
94 case TokenType.Operator:
95 case TokenType.PrivateIdentifier:
96 case TokenType.String:
97 case TokenType.Error:
98 return this.strValue;
99 case TokenType.Number:
100 return this.numValue.toString();
101 default:
102 return null;
103 }
104 }
105}
106function newCharacterToken(index, end, code) {
107 return new Token(index, end, TokenType.Character, code, String.fromCharCode(code));
108}
109function newIdentifierToken(index, end, text) {
110 return new Token(index, end, TokenType.Identifier, 0, text);
111}
112function newPrivateIdentifierToken(index, end, text) {
113 return new Token(index, end, TokenType.PrivateIdentifier, 0, text);
114}
115function newKeywordToken(index, end, text) {
116 return new Token(index, end, TokenType.Keyword, 0, text);
117}
118function newOperatorToken(index, end, text) {
119 return new Token(index, end, TokenType.Operator, 0, text);
120}
121function newStringToken(index, end, text) {
122 return new Token(index, end, TokenType.String, 0, text);
123}
124function newNumberToken(index, end, n) {
125 return new Token(index, end, TokenType.Number, n, '');
126}
127function newErrorToken(index, end, message) {
128 return new Token(index, end, TokenType.Error, 0, message);
129}
130export const EOF = new Token(-1, -1, TokenType.Character, 0, '');
131class _Scanner {
132 constructor(input) {
133 this.input = input;
134 this.peek = 0;
135 this.index = -1;
136 this.length = input.length;
137 this.advance();
138 }
139 advance() {
140 this.peek = ++this.index >= this.length ? chars.$EOF : this.input.charCodeAt(this.index);
141 }
142 scanToken() {
143 const input = this.input, length = this.length;
144 let peek = this.peek, index = this.index;
145 // Skip whitespace.
146 while (peek <= chars.$SPACE) {
147 if (++index >= length) {
148 peek = chars.$EOF;
149 break;
150 }
151 else {
152 peek = input.charCodeAt(index);
153 }
154 }
155 this.peek = peek;
156 this.index = index;
157 if (index >= length) {
158 return null;
159 }
160 // Handle identifiers and numbers.
161 if (isIdentifierStart(peek))
162 return this.scanIdentifier();
163 if (chars.isDigit(peek))
164 return this.scanNumber(index);
165 const start = index;
166 switch (peek) {
167 case chars.$PERIOD:
168 this.advance();
169 return chars.isDigit(this.peek) ? this.scanNumber(start) :
170 newCharacterToken(start, this.index, chars.$PERIOD);
171 case chars.$LPAREN:
172 case chars.$RPAREN:
173 case chars.$LBRACE:
174 case chars.$RBRACE:
175 case chars.$LBRACKET:
176 case chars.$RBRACKET:
177 case chars.$COMMA:
178 case chars.$COLON:
179 case chars.$SEMICOLON:
180 return this.scanCharacter(start, peek);
181 case chars.$SQ:
182 case chars.$DQ:
183 return this.scanString();
184 case chars.$HASH:
185 return this.scanPrivateIdentifier();
186 case chars.$PLUS:
187 case chars.$MINUS:
188 case chars.$STAR:
189 case chars.$SLASH:
190 case chars.$PERCENT:
191 case chars.$CARET:
192 return this.scanOperator(start, String.fromCharCode(peek));
193 case chars.$QUESTION:
194 return this.scanQuestion(start);
195 case chars.$LT:
196 case chars.$GT:
197 return this.scanComplexOperator(start, String.fromCharCode(peek), chars.$EQ, '=');
198 case chars.$BANG:
199 case chars.$EQ:
200 return this.scanComplexOperator(start, String.fromCharCode(peek), chars.$EQ, '=', chars.$EQ, '=');
201 case chars.$AMPERSAND:
202 return this.scanComplexOperator(start, '&', chars.$AMPERSAND, '&');
203 case chars.$BAR:
204 return this.scanComplexOperator(start, '|', chars.$BAR, '|');
205 case chars.$NBSP:
206 while (chars.isWhitespace(this.peek))
207 this.advance();
208 return this.scanToken();
209 }
210 this.advance();
211 return this.error(`Unexpected character [${String.fromCharCode(peek)}]`, 0);
212 }
213 scanCharacter(start, code) {
214 this.advance();
215 return newCharacterToken(start, this.index, code);
216 }
217 scanOperator(start, str) {
218 this.advance();
219 return newOperatorToken(start, this.index, str);
220 }
221 /**
222 * Tokenize a 2/3 char long operator
223 *
224 * @param start start index in the expression
225 * @param one first symbol (always part of the operator)
226 * @param twoCode code point for the second symbol
227 * @param two second symbol (part of the operator when the second code point matches)
228 * @param threeCode code point for the third symbol
229 * @param three third symbol (part of the operator when provided and matches source expression)
230 */
231 scanComplexOperator(start, one, twoCode, two, threeCode, three) {
232 this.advance();
233 let str = one;
234 if (this.peek == twoCode) {
235 this.advance();
236 str += two;
237 }
238 if (threeCode != null && this.peek == threeCode) {
239 this.advance();
240 str += three;
241 }
242 return newOperatorToken(start, this.index, str);
243 }
244 scanIdentifier() {
245 const start = this.index;
246 this.advance();
247 while (isIdentifierPart(this.peek))
248 this.advance();
249 const str = this.input.substring(start, this.index);
250 return KEYWORDS.indexOf(str) > -1 ? newKeywordToken(start, this.index, str) :
251 newIdentifierToken(start, this.index, str);
252 }
253 /** Scans an ECMAScript private identifier. */
254 scanPrivateIdentifier() {
255 const start = this.index;
256 this.advance();
257 if (!isIdentifierStart(this.peek)) {
258 return this.error('Invalid character [#]', -1);
259 }
260 while (isIdentifierPart(this.peek))
261 this.advance();
262 const identifierName = this.input.substring(start, this.index);
263 return newPrivateIdentifierToken(start, this.index, identifierName);
264 }
265 scanNumber(start) {
266 let simple = (this.index === start);
267 let hasSeparators = false;
268 this.advance(); // Skip initial digit.
269 while (true) {
270 if (chars.isDigit(this.peek)) {
271 // Do nothing.
272 }
273 else if (this.peek === chars.$_) {
274 // Separators are only valid when they're surrounded by digits. E.g. `1_0_1` is
275 // valid while `_101` and `101_` are not. The separator can't be next to the decimal
276 // point or another separator either. Note that it's unlikely that we'll hit a case where
277 // the underscore is at the start, because that's a valid identifier and it will be picked
278 // up earlier in the parsing. We validate for it anyway just in case.
279 if (!chars.isDigit(this.input.charCodeAt(this.index - 1)) ||
280 !chars.isDigit(this.input.charCodeAt(this.index + 1))) {
281 return this.error('Invalid numeric separator', 0);
282 }
283 hasSeparators = true;
284 }
285 else if (this.peek === chars.$PERIOD) {
286 simple = false;
287 }
288 else if (isExponentStart(this.peek)) {
289 this.advance();
290 if (isExponentSign(this.peek))
291 this.advance();
292 if (!chars.isDigit(this.peek))
293 return this.error('Invalid exponent', -1);
294 simple = false;
295 }
296 else {
297 break;
298 }
299 this.advance();
300 }
301 let str = this.input.substring(start, this.index);
302 if (hasSeparators) {
303 str = str.replace(/_/g, '');
304 }
305 const value = simple ? parseIntAutoRadix(str) : parseFloat(str);
306 return newNumberToken(start, this.index, value);
307 }
308 scanString() {
309 const start = this.index;
310 const quote = this.peek;
311 this.advance(); // Skip initial quote.
312 let buffer = '';
313 let marker = this.index;
314 const input = this.input;
315 while (this.peek != quote) {
316 if (this.peek == chars.$BACKSLASH) {
317 buffer += input.substring(marker, this.index);
318 this.advance();
319 let unescapedCode;
320 // Workaround for TS2.1-introduced type strictness
321 this.peek = this.peek;
322 if (this.peek == chars.$u) {
323 // 4 character hex code for unicode character.
324 const hex = input.substring(this.index + 1, this.index + 5);
325 if (/^[0-9a-f]+$/i.test(hex)) {
326 unescapedCode = parseInt(hex, 16);
327 }
328 else {
329 return this.error(`Invalid unicode escape [\\u${hex}]`, 0);
330 }
331 for (let i = 0; i < 5; i++) {
332 this.advance();
333 }
334 }
335 else {
336 unescapedCode = unescape(this.peek);
337 this.advance();
338 }
339 buffer += String.fromCharCode(unescapedCode);
340 marker = this.index;
341 }
342 else if (this.peek == chars.$EOF) {
343 return this.error('Unterminated quote', 0);
344 }
345 else {
346 this.advance();
347 }
348 }
349 const last = input.substring(marker, this.index);
350 this.advance(); // Skip terminating quote.
351 return newStringToken(start, this.index, buffer + last);
352 }
353 scanQuestion(start) {
354 this.advance();
355 let str = '?';
356 // Either `a ?? b` or 'a?.b'.
357 if (this.peek === chars.$QUESTION || this.peek === chars.$PERIOD) {
358 str += this.peek === chars.$PERIOD ? '.' : '?';
359 this.advance();
360 }
361 return newOperatorToken(start, this.index, str);
362 }
363 error(message, offset) {
364 const position = this.index + offset;
365 return newErrorToken(position, this.index, `Lexer Error: ${message} at column ${position} in expression [${this.input}]`);
366 }
367}
368function isIdentifierStart(code) {
369 return (chars.$a <= code && code <= chars.$z) || (chars.$A <= code && code <= chars.$Z) ||
370 (code == chars.$_) || (code == chars.$$);
371}
372export function isIdentifier(input) {
373 if (input.length == 0)
374 return false;
375 const scanner = new _Scanner(input);
376 if (!isIdentifierStart(scanner.peek))
377 return false;
378 scanner.advance();
379 while (scanner.peek !== chars.$EOF) {
380 if (!isIdentifierPart(scanner.peek))
381 return false;
382 scanner.advance();
383 }
384 return true;
385}
386function isIdentifierPart(code) {
387 return chars.isAsciiLetter(code) || chars.isDigit(code) || (code == chars.$_) ||
388 (code == chars.$$);
389}
390function isExponentStart(code) {
391 return code == chars.$e || code == chars.$E;
392}
393function isExponentSign(code) {
394 return code == chars.$MINUS || code == chars.$PLUS;
395}
396function unescape(code) {
397 switch (code) {
398 case chars.$n:
399 return chars.$LF;
400 case chars.$f:
401 return chars.$FF;
402 case chars.$r:
403 return chars.$CR;
404 case chars.$t:
405 return chars.$TAB;
406 case chars.$v:
407 return chars.$VTAB;
408 default:
409 return code;
410 }
411}
412function parseIntAutoRadix(text) {
413 const result = parseInt(text);
414 if (isNaN(result)) {
415 throw new Error('Invalid integer literal when parsing ' + text);
416 }
417 return result;
418}
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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';\n\nexport enum TokenType {\n  Character,\n  Identifier,\n  PrivateIdentifier,\n  Keyword,\n  String,\n  Operator,\n  Number,\n  Error\n}\n\nconst KEYWORDS = ['var', 'let', 'as', 'null', 'undefined', 'true', 'false', 'if', 'else', 'this'];\n\nexport class Lexer {\n  tokenize(text: string): Token[] {\n    const scanner = new _Scanner(text);\n    const tokens: Token[] = [];\n    let token = scanner.scanToken();\n    while (token != null) {\n      tokens.push(token);\n      token = scanner.scanToken();\n    }\n    return tokens;\n  }\n}\n\nexport class Token {\n  constructor(\n      public index: number, public end: number, public type: TokenType, public numValue: number,\n      public strValue: string) {}\n\n  isCharacter(code: number): boolean {\n    return this.type == TokenType.Character && this.numValue == code;\n  }\n\n  isNumber(): boolean {\n    return this.type == TokenType.Number;\n  }\n\n  isString(): boolean {\n    return this.type == TokenType.String;\n  }\n\n  isOperator(operator: string): boolean {\n    return this.type == TokenType.Operator && this.strValue == operator;\n  }\n\n  isIdentifier(): boolean {\n    return this.type == TokenType.Identifier;\n  }\n\n  isPrivateIdentifier(): boolean {\n    return this.type == TokenType.PrivateIdentifier;\n  }\n\n  isKeyword(): boolean {\n    return this.type == TokenType.Keyword;\n  }\n\n  isKeywordLet(): boolean {\n    return this.type == TokenType.Keyword && this.strValue == 'let';\n  }\n\n  isKeywordAs(): boolean {\n    return this.type == TokenType.Keyword && this.strValue == 'as';\n  }\n\n  isKeywordNull(): boolean {\n    return this.type == TokenType.Keyword && this.strValue == 'null';\n  }\n\n  isKeywordUndefined(): boolean {\n    return this.type == TokenType.Keyword && this.strValue == 'undefined';\n  }\n\n  isKeywordTrue(): boolean {\n    return this.type == TokenType.Keyword && this.strValue == 'true';\n  }\n\n  isKeywordFalse(): boolean {\n    return this.type == TokenType.Keyword && this.strValue == 'false';\n  }\n\n  isKeywordThis(): boolean {\n    return this.type == TokenType.Keyword && this.strValue == 'this';\n  }\n\n  isError(): boolean {\n    return this.type == TokenType.Error;\n  }\n\n  toNumber(): number {\n    return this.type == TokenType.Number ? this.numValue : -1;\n  }\n\n  toString(): string|null {\n    switch (this.type) {\n      case TokenType.Character:\n      case TokenType.Identifier:\n      case TokenType.Keyword:\n      case TokenType.Operator:\n      case TokenType.PrivateIdentifier:\n      case TokenType.String:\n      case TokenType.Error:\n        return this.strValue;\n      case TokenType.Number:\n        return this.numValue.toString();\n      default:\n        return null;\n    }\n  }\n}\n\nfunction newCharacterToken(index: number, end: number, code: number): Token {\n  return new Token(index, end, TokenType.Character, code, String.fromCharCode(code));\n}\n\nfunction newIdentifierToken(index: number, end: number, text: string): Token {\n  return new Token(index, end, TokenType.Identifier, 0, text);\n}\n\nfunction newPrivateIdentifierToken(index: number, end: number, text: string): Token {\n  return new Token(index, end, TokenType.PrivateIdentifier, 0, text);\n}\n\nfunction newKeywordToken(index: number, end: number, text: string): Token {\n  return new Token(index, end, TokenType.Keyword, 0, text);\n}\n\nfunction newOperatorToken(index: number, end: number, text: string): Token {\n  return new Token(index, end, TokenType.Operator, 0, text);\n}\n\nfunction newStringToken(index: number, end: number, text: string): Token {\n  return new Token(index, end, TokenType.String, 0, text);\n}\n\nfunction newNumberToken(index: number, end: number, n: number): Token {\n  return new Token(index, end, TokenType.Number, n, '');\n}\n\nfunction newErrorToken(index: number, end: number, message: string): Token {\n  return new Token(index, end, TokenType.Error, 0, message);\n}\n\nexport const EOF: Token = new Token(-1, -1, TokenType.Character, 0, '');\n\nclass _Scanner {\n  length: number;\n  peek: number = 0;\n  index: number = -1;\n\n  constructor(public input: string) {\n    this.length = input.length;\n    this.advance();\n  }\n\n  advance() {\n    this.peek = ++this.index >= this.length ? chars.$EOF : this.input.charCodeAt(this.index);\n  }\n\n  scanToken(): Token|null {\n    const input = this.input, length = this.length;\n    let peek = this.peek, index = this.index;\n\n    // Skip whitespace.\n    while (peek <= chars.$SPACE) {\n      if (++index >= length) {\n        peek = chars.$EOF;\n        break;\n      } else {\n        peek = input.charCodeAt(index);\n      }\n    }\n\n    this.peek = peek;\n    this.index = index;\n\n    if (index >= length) {\n      return null;\n    }\n\n    // Handle identifiers and numbers.\n    if (isIdentifierStart(peek)) return this.scanIdentifier();\n    if (chars.isDigit(peek)) return this.scanNumber(index);\n\n    const start: number = index;\n    switch (peek) {\n      case chars.$PERIOD:\n        this.advance();\n        return chars.isDigit(this.peek) ? this.scanNumber(start) :\n                                          newCharacterToken(start, this.index, chars.$PERIOD);\n      case chars.$LPAREN:\n      case chars.$RPAREN:\n      case chars.$LBRACE:\n      case chars.$RBRACE:\n      case chars.$LBRACKET:\n      case chars.$RBRACKET:\n      case chars.$COMMA:\n      case chars.$COLON:\n      case chars.$SEMICOLON:\n        return this.scanCharacter(start, peek);\n      case chars.$SQ:\n      case chars.$DQ:\n        return this.scanString();\n      case chars.$HASH:\n        return this.scanPrivateIdentifier();\n      case chars.$PLUS:\n      case chars.$MINUS:\n      case chars.$STAR:\n      case chars.$SLASH:\n      case chars.$PERCENT:\n      case chars.$CARET:\n        return this.scanOperator(start, String.fromCharCode(peek));\n      case chars.$QUESTION:\n        return this.scanQuestion(start);\n      case chars.$LT:\n      case chars.$GT:\n        return this.scanComplexOperator(start, String.fromCharCode(peek), chars.$EQ, '=');\n      case chars.$BANG:\n      case chars.$EQ:\n        return this.scanComplexOperator(\n            start, String.fromCharCode(peek), chars.$EQ, '=', chars.$EQ, '=');\n      case chars.$AMPERSAND:\n        return this.scanComplexOperator(start, '&', chars.$AMPERSAND, '&');\n      case chars.$BAR:\n        return this.scanComplexOperator(start, '|', chars.$BAR, '|');\n      case chars.$NBSP:\n        while (chars.isWhitespace(this.peek)) this.advance();\n        return this.scanToken();\n    }\n\n    this.advance();\n    return this.error(`Unexpected character [${String.fromCharCode(peek)}]`, 0);\n  }\n\n  scanCharacter(start: number, code: number): Token {\n    this.advance();\n    return newCharacterToken(start, this.index, code);\n  }\n\n\n  scanOperator(start: number, str: string): Token {\n    this.advance();\n    return newOperatorToken(start, this.index, str);\n  }\n\n  /**\n   * Tokenize a 2/3 char long operator\n   *\n   * @param start start index in the expression\n   * @param one first symbol (always part of the operator)\n   * @param twoCode code point for the second symbol\n   * @param two second symbol (part of the operator when the second code point matches)\n   * @param threeCode code point for the third symbol\n   * @param three third symbol (part of the operator when provided and matches source expression)\n   */\n  scanComplexOperator(\n      start: number, one: string, twoCode: number, two: string, threeCode?: number,\n      three?: string): Token {\n    this.advance();\n    let str: string = one;\n    if (this.peek == twoCode) {\n      this.advance();\n      str += two;\n    }\n    if (threeCode != null && this.peek == threeCode) {\n      this.advance();\n      str += three;\n    }\n    return newOperatorToken(start, this.index, str);\n  }\n\n  scanIdentifier(): Token {\n    const start: number = this.index;\n    this.advance();\n    while (isIdentifierPart(this.peek)) this.advance();\n    const str: string = this.input.substring(start, this.index);\n    return KEYWORDS.indexOf(str) > -1 ? newKeywordToken(start, this.index, str) :\n                                        newIdentifierToken(start, this.index, str);\n  }\n\n  /** Scans an ECMAScript private identifier. */\n  scanPrivateIdentifier(): Token {\n    const start: number = this.index;\n    this.advance();\n    if (!isIdentifierStart(this.peek)) {\n      return this.error('Invalid character [#]', -1);\n    }\n    while (isIdentifierPart(this.peek)) this.advance();\n    const identifierName: string = this.input.substring(start, this.index);\n    return newPrivateIdentifierToken(start, this.index, identifierName);\n  }\n\n  scanNumber(start: number): Token {\n    let simple = (this.index === start);\n    let hasSeparators = false;\n    this.advance();  // Skip initial digit.\n    while (true) {\n      if (chars.isDigit(this.peek)) {\n        // Do nothing.\n      } else if (this.peek === chars.$_) {\n        // Separators are only valid when they're surrounded by digits. E.g. `1_0_1` is\n        // valid while `_101` and `101_` are not. The separator can't be next to the decimal\n        // point or another separator either. Note that it's unlikely that we'll hit a case where\n        // the underscore is at the start, because that's a valid identifier and it will be picked\n        // up earlier in the parsing. We validate for it anyway just in case.\n        if (!chars.isDigit(this.input.charCodeAt(this.index - 1)) ||\n            !chars.isDigit(this.input.charCodeAt(this.index + 1))) {\n          return this.error('Invalid numeric separator', 0);\n        }\n        hasSeparators = true;\n      } else if (this.peek === chars.$PERIOD) {\n        simple = false;\n      } else if (isExponentStart(this.peek)) {\n        this.advance();\n        if (isExponentSign(this.peek)) this.advance();\n        if (!chars.isDigit(this.peek)) return this.error('Invalid exponent', -1);\n        simple = false;\n      } else {\n        break;\n      }\n      this.advance();\n    }\n\n    let str = this.input.substring(start, this.index);\n    if (hasSeparators) {\n      str = str.replace(/_/g, '');\n    }\n    const value = simple ? parseIntAutoRadix(str) : parseFloat(str);\n    return newNumberToken(start, this.index, value);\n  }\n\n  scanString(): Token {\n    const start: number = this.index;\n    const quote: number = this.peek;\n    this.advance();  // Skip initial quote.\n\n    let buffer: string = '';\n    let marker: number = this.index;\n    const input: string = this.input;\n\n    while (this.peek != quote) {\n      if (this.peek == chars.$BACKSLASH) {\n        buffer += input.substring(marker, this.index);\n        this.advance();\n        let unescapedCode: number;\n        // Workaround for TS2.1-introduced type strictness\n        this.peek = this.peek;\n        if (this.peek == chars.$u) {\n          // 4 character hex code for unicode character.\n          const hex: string = input.substring(this.index + 1, this.index + 5);\n          if (/^[0-9a-f]+$/i.test(hex)) {\n            unescapedCode = parseInt(hex, 16);\n          } else {\n            return this.error(`Invalid unicode escape [\\\\u${hex}]`, 0);\n          }\n          for (let i: number = 0; i < 5; i++) {\n            this.advance();\n          }\n        } else {\n          unescapedCode = unescape(this.peek);\n          this.advance();\n        }\n        buffer += String.fromCharCode(unescapedCode);\n        marker = this.index;\n      } else if (this.peek == chars.$EOF) {\n        return this.error('Unterminated quote', 0);\n      } else {\n        this.advance();\n      }\n    }\n\n    const last: string = input.substring(marker, this.index);\n    this.advance();  // Skip terminating quote.\n\n    return newStringToken(start, this.index, buffer + last);\n  }\n\n  scanQuestion(start: number): Token {\n    this.advance();\n    let str: string = '?';\n    // Either `a ?? b` or 'a?.b'.\n    if (this.peek === chars.$QUESTION || this.peek === chars.$PERIOD) {\n      str += this.peek === chars.$PERIOD ? '.' : '?';\n      this.advance();\n    }\n    return newOperatorToken(start, this.index, str);\n  }\n\n  error(message: string, offset: number): Token {\n    const position: number = this.index + offset;\n    return newErrorToken(\n        position, this.index,\n        `Lexer Error: ${message} at column ${position} in expression [${this.input}]`);\n  }\n}\n\nfunction isIdentifierStart(code: number): boolean {\n  return (chars.$a <= code && code <= chars.$z) || (chars.$A <= code && code <= chars.$Z) ||\n      (code == chars.$_) || (code == chars.$$);\n}\n\nexport function isIdentifier(input: string): boolean {\n  if (input.length == 0) return false;\n  const scanner = new _Scanner(input);\n  if (!isIdentifierStart(scanner.peek)) return false;\n  scanner.advance();\n  while (scanner.peek !== chars.$EOF) {\n    if (!isIdentifierPart(scanner.peek)) return false;\n    scanner.advance();\n  }\n  return true;\n}\n\nfunction isIdentifierPart(code: number): boolean {\n  return chars.isAsciiLetter(code) || chars.isDigit(code) || (code == chars.$_) ||\n      (code == chars.$$);\n}\n\nfunction isExponentStart(code: number): boolean {\n  return code == chars.$e || code == chars.$E;\n}\n\nfunction isExponentSign(code: number): boolean {\n  return code == chars.$MINUS || code == chars.$PLUS;\n}\n\nfunction unescape(code: number): number {\n  switch (code) {\n    case chars.$n:\n      return chars.$LF;\n    case chars.$f:\n      return chars.$FF;\n    case chars.$r:\n      return chars.$CR;\n    case chars.$t:\n      return chars.$TAB;\n    case chars.$v:\n      return chars.$VTAB;\n    default:\n      return code;\n  }\n}\n\nfunction parseIntAutoRadix(text: string): number {\n  const result: number = parseInt(text);\n  if (isNaN(result)) {\n    throw new Error('Invalid integer literal when parsing ' + text);\n  }\n  return result;\n}\n"]}
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