/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
import * as chars from '../chars';
export var TokenType;
(function (TokenType) {
    TokenType[TokenType["Character"] = 0] = "Character";
    TokenType[TokenType["Identifier"] = 1] = "Identifier";
    TokenType[TokenType["PrivateIdentifier"] = 2] = "PrivateIdentifier";
    TokenType[TokenType["Keyword"] = 3] = "Keyword";
    TokenType[TokenType["String"] = 4] = "String";
    TokenType[TokenType["Operator"] = 5] = "Operator";
    TokenType[TokenType["Number"] = 6] = "Number";
    TokenType[TokenType["Error"] = 7] = "Error";
})(TokenType || (TokenType = {}));
const KEYWORDS = ['var', 'let', 'as', 'null', 'undefined', 'true', 'false', 'if', 'else', 'this'];
export class Lexer {
    tokenize(text) {
        const scanner = new _Scanner(text);
        const tokens = [];
        let token = scanner.scanToken();
        while (token != null) {
            tokens.push(token);
            token = scanner.scanToken();
        }
        return tokens;
    }
}
export class Token {
    constructor(index, end, type, numValue, strValue) {
        this.index = index;
        this.end = end;
        this.type = type;
        this.numValue = numValue;
        this.strValue = strValue;
    }
    isCharacter(code) {
        return this.type == TokenType.Character && this.numValue == code;
    }
    isNumber() {
        return this.type == TokenType.Number;
    }
    isString() {
        return this.type == TokenType.String;
    }
    isOperator(operator) {
        return this.type == TokenType.Operator && this.strValue == operator;
    }
    isIdentifier() {
        return this.type == TokenType.Identifier;
    }
    isPrivateIdentifier() {
        return this.type == TokenType.PrivateIdentifier;
    }
    isKeyword() {
        return this.type == TokenType.Keyword;
    }
    isKeywordLet() {
        return this.type == TokenType.Keyword && this.strValue == 'let';
    }
    isKeywordAs() {
        return this.type == TokenType.Keyword && this.strValue == 'as';
    }
    isKeywordNull() {
        return this.type == TokenType.Keyword && this.strValue == 'null';
    }
    isKeywordUndefined() {
        return this.type == TokenType.Keyword && this.strValue == 'undefined';
    }
    isKeywordTrue() {
        return this.type == TokenType.Keyword && this.strValue == 'true';
    }
    isKeywordFalse() {
        return this.type == TokenType.Keyword && this.strValue == 'false';
    }
    isKeywordThis() {
        return this.type == TokenType.Keyword && this.strValue == 'this';
    }
    isError() {
        return this.type == TokenType.Error;
    }
    toNumber() {
        return this.type == TokenType.Number ? this.numValue : -1;
    }
    toString() {
        switch (this.type) {
            case TokenType.Character:
            case TokenType.Identifier:
            case TokenType.Keyword:
            case TokenType.Operator:
            case TokenType.PrivateIdentifier:
            case TokenType.String:
            case TokenType.Error:
                return this.strValue;
            case TokenType.Number:
                return this.numValue.toString();
            default:
                return null;
        }
    }
}
function newCharacterToken(index, end, code) {
    return new Token(index, end, TokenType.Character, code, String.fromCharCode(code));
}
function newIdentifierToken(index, end, text) {
    return new Token(index, end, TokenType.Identifier, 0, text);
}
function newPrivateIdentifierToken(index, end, text) {
    return new Token(index, end, TokenType.PrivateIdentifier, 0, text);
}
function newKeywordToken(index, end, text) {
    return new Token(index, end, TokenType.Keyword, 0, text);
}
function newOperatorToken(index, end, text) {
    return new Token(index, end, TokenType.Operator, 0, text);
}
function newStringToken(index, end, text) {
    return new Token(index, end, TokenType.String, 0, text);
}
function newNumberToken(index, end, n) {
    return new Token(index, end, TokenType.Number, n, '');
}
function newErrorToken(index, end, message) {
    return new Token(index, end, TokenType.Error, 0, message);
}
export const EOF = new Token(-1, -1, TokenType.Character, 0, '');
class _Scanner {
    constructor(input) {
        this.input = input;
        this.peek = 0;
        this.index = -1;
        this.length = input.length;
        this.advance();
    }
    advance() {
        this.peek = ++this.index >= this.length ? chars.$EOF : this.input.charCodeAt(this.index);
    }
    scanToken() {
        const input = this.input, length = this.length;
        let peek = this.peek, index = this.index;
        // Skip whitespace.
        while (peek <= chars.$SPACE) {
            if (++index >= length) {
                peek = chars.$EOF;
                break;
            }
            else {
                peek = input.charCodeAt(index);
            }
        }
        this.peek = peek;
        this.index = index;
        if (index >= length) {
            return null;
        }
        // Handle identifiers and numbers.
        if (isIdentifierStart(peek))
            return this.scanIdentifier();
        if (chars.isDigit(peek))
            return this.scanNumber(index);
        const start = index;
        switch (peek) {
            case chars.$PERIOD:
                this.advance();
                return chars.isDigit(this.peek) ? this.scanNumber(start) :
                    newCharacterToken(start, this.index, chars.$PERIOD);
            case chars.$LPAREN:
            case chars.$RPAREN:
            case chars.$LBRACE:
            case chars.$RBRACE:
            case chars.$LBRACKET:
            case chars.$RBRACKET:
            case chars.$COMMA:
            case chars.$COLON:
            case chars.$SEMICOLON:
                return this.scanCharacter(start, peek);
            case chars.$SQ:
            case chars.$DQ:
                return this.scanString();
            case chars.$HASH:
                return this.scanPrivateIdentifier();
            case chars.$PLUS:
            case chars.$MINUS:
            case chars.$STAR:
            case chars.$SLASH:
            case chars.$PERCENT:
            case chars.$CARET:
                return this.scanOperator(start, String.fromCharCode(peek));
            case chars.$QUESTION:
                return this.scanQuestion(start);
            case chars.$LT:
            case chars.$GT:
                return this.scanComplexOperator(start, String.fromCharCode(peek), chars.$EQ, '=');
            case chars.$BANG:
            case chars.$EQ:
                return this.scanComplexOperator(start, String.fromCharCode(peek), chars.$EQ, '=', chars.$EQ, '=');
            case chars.$AMPERSAND:
                return this.scanComplexOperator(start, '&', chars.$AMPERSAND, '&');
            case chars.$BAR:
                return this.scanComplexOperator(start, '|', chars.$BAR, '|');
            case chars.$NBSP:
                while (chars.isWhitespace(this.peek))
                    this.advance();
                return this.scanToken();
        }
        this.advance();
        return this.error(`Unexpected character [${String.fromCharCode(peek)}]`, 0);
    }
    scanCharacter(start, code) {
        this.advance();
        return newCharacterToken(start, this.index, code);
    }
    scanOperator(start, str) {
        this.advance();
        return newOperatorToken(start, this.index, str);
    }
    /**
     * Tokenize a 2/3 char long operator
     *
     * @param start start index in the expression
     * @param one first symbol (always part of the operator)
     * @param twoCode code point for the second symbol
     * @param two second symbol (part of the operator when the second code point matches)
     * @param threeCode code point for the third symbol
     * @param three third symbol (part of the operator when provided and matches source expression)
     */
    scanComplexOperator(start, one, twoCode, two, threeCode, three) {
        this.advance();
        let str = one;
        if (this.peek == twoCode) {
            this.advance();
            str += two;
        }
        if (threeCode != null && this.peek == threeCode) {
            this.advance();
            str += three;
        }
        return newOperatorToken(start, this.index, str);
    }
    scanIdentifier() {
        const start = this.index;
        this.advance();
        while (isIdentifierPart(this.peek))
            this.advance();
        const str = this.input.substring(start, this.index);
        return KEYWORDS.indexOf(str) > -1 ? newKeywordToken(start, this.index, str) :
            newIdentifierToken(start, this.index, str);
    }
    /** Scans an ECMAScript private identifier. */
    scanPrivateIdentifier() {
        const start = this.index;
        this.advance();
        if (!isIdentifierStart(this.peek)) {
            return this.error('Invalid character [#]', -1);
        }
        while (isIdentifierPart(this.peek))
            this.advance();
        const identifierName = this.input.substring(start, this.index);
        return newPrivateIdentifierToken(start, this.index, identifierName);
    }
    scanNumber(start) {
        let simple = (this.index === start);
        let hasSeparators = false;
        this.advance(); // Skip initial digit.
        while (true) {
            if (chars.isDigit(this.peek)) {
                // Do nothing.
            }
            else if (this.peek === chars.$_) {
                // Separators are only valid when they're surrounded by digits. E.g. `1_0_1` is
                // valid while `_101` and `101_` are not. The separator can't be next to the decimal
                // point or another separator either. Note that it's unlikely that we'll hit a case where
                // the underscore is at the start, because that's a valid identifier and it will be picked
                // up earlier in the parsing. We validate for it anyway just in case.
                if (!chars.isDigit(this.input.charCodeAt(this.index - 1)) ||
                    !chars.isDigit(this.input.charCodeAt(this.index + 1))) {
                    return this.error('Invalid numeric separator', 0);
                }
                hasSeparators = true;
            }
            else if (this.peek === chars.$PERIOD) {
                simple = false;
            }
            else if (isExponentStart(this.peek)) {
                this.advance();
                if (isExponentSign(this.peek))
                    this.advance();
                if (!chars.isDigit(this.peek))
                    return this.error('Invalid exponent', -1);
                simple = false;
            }
            else {
                break;
            }
            this.advance();
        }
        let str = this.input.substring(start, this.index);
        if (hasSeparators) {
            str = str.replace(/_/g, '');
        }
        const value = simple ? parseIntAutoRadix(str) : parseFloat(str);
        return newNumberToken(start, this.index, value);
    }
    scanString() {
        const start = this.index;
        const quote = this.peek;
        this.advance(); // Skip initial quote.
        let buffer = '';
        let marker = this.index;
        const input = this.input;
        while (this.peek != quote) {
            if (this.peek == chars.$BACKSLASH) {
                buffer += input.substring(marker, this.index);
                let unescapedCode;
                this.advance(); // mutates this.peek
                // @ts-expect-error see microsoft/TypeScript#9998
                if (this.peek == chars.$u) {
                    // 4 character hex code for unicode character.
                    const hex = input.substring(this.index + 1, this.index + 5);
                    if (/^[0-9a-f]+$/i.test(hex)) {
                        unescapedCode = parseInt(hex, 16);
                    }
                    else {
                        return this.error(`Invalid unicode escape [\\u${hex}]`, 0);
                    }
                    for (let i = 0; i < 5; i++) {
                        this.advance();
                    }
                }
                else {
                    unescapedCode = unescape(this.peek);
                    this.advance();
                }
                buffer += String.fromCharCode(unescapedCode);
                marker = this.index;
            }
            else if (this.peek == chars.$EOF) {
                return this.error('Unterminated quote', 0);
            }
            else {
                this.advance();
            }
        }
        const last = input.substring(marker, this.index);
        this.advance(); // Skip terminating quote.
        return newStringToken(start, this.index, buffer + last);
    }
    scanQuestion(start) {
        this.advance();
        let str = '?';
        // Either `a ?? b` or 'a?.b'.
        if (this.peek === chars.$QUESTION || this.peek === chars.$PERIOD) {
            str += this.peek === chars.$PERIOD ? '.' : '?';
            this.advance();
        }
        return newOperatorToken(start, this.index, str);
    }
    error(message, offset) {
        const position = this.index + offset;
        return newErrorToken(position, this.index, `Lexer Error: ${message} at column ${position} in expression [${this.input}]`);
    }
}
function isIdentifierStart(code) {
    return (chars.$a <= code && code <= chars.$z) || (chars.$A <= code && code <= chars.$Z) ||
        (code == chars.$_) || (code == chars.$$);
}
export function isIdentifier(input) {
    if (input.length == 0)
        return false;
    const scanner = new _Scanner(input);
    if (!isIdentifierStart(scanner.peek))
        return false;
    scanner.advance();
    while (scanner.peek !== chars.$EOF) {
        if (!isIdentifierPart(scanner.peek))
            return false;
        scanner.advance();
    }
    return true;
}
function isIdentifierPart(code) {
    return chars.isAsciiLetter(code) || chars.isDigit(code) || (code == chars.$_) ||
        (code == chars.$$);
}
function isExponentStart(code) {
    return code == chars.$e || code == chars.$E;
}
function isExponentSign(code) {
    return code == chars.$MINUS || code == chars.$PLUS;
}
function unescape(code) {
    switch (code) {
        case chars.$n:
            return chars.$LF;
        case chars.$f:
            return chars.$FF;
        case chars.$r:
            return chars.$CR;
        case chars.$t:
            return chars.$TAB;
        case chars.$v:
            return chars.$VTAB;
        default:
            return code;
    }
}
function parseIntAutoRadix(text) {
    const result = parseInt(text);
    if (isNaN(result)) {
        throw new Error('Invalid integer literal when parsing ' + text);
    }
    return result;
}
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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        let unescapedCode: number;\n        this.advance();  // mutates this.peek\n        // @ts-expect-error see microsoft/TypeScript#9998\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"]}