| 1 | /**
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| 2 | * @license
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| 3 | * Copyright Google LLC All Rights Reserved.
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| 4 | *
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| 5 | * Use of this source code is governed by an MIT-style license that can be
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| 6 | * found in the LICENSE file at https://angular.io/license
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| 7 | */
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| 8 | import * as chars from '../chars';
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| 9 | export var TokenType;
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| 10 | (function (TokenType) {
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| 11 | TokenType[TokenType["Character"] = 0] = "Character";
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| 12 | TokenType[TokenType["Identifier"] = 1] = "Identifier";
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| 13 | TokenType[TokenType["PrivateIdentifier"] = 2] = "PrivateIdentifier";
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| 14 | TokenType[TokenType["Keyword"] = 3] = "Keyword";
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| 15 | TokenType[TokenType["String"] = 4] = "String";
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| 16 | TokenType[TokenType["Operator"] = 5] = "Operator";
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| 17 | TokenType[TokenType["Number"] = 6] = "Number";
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| 18 | TokenType[TokenType["Error"] = 7] = "Error";
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| 19 | })(TokenType || (TokenType = {}));
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| 20 | const KEYWORDS = ['var', 'let', 'as', 'null', 'undefined', 'true', 'false', 'if', 'else', 'this'];
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| 21 | export class Lexer {
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| 22 | tokenize(text) {
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| 23 | const scanner = new _Scanner(text);
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| 24 | const tokens = [];
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| 25 | let token = scanner.scanToken();
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| 26 | while (token != null) {
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| 27 | tokens.push(token);
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| 28 | token = scanner.scanToken();
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| 29 | }
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| 30 | return tokens;
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| 31 | }
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| 32 | }
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| 33 | export class Token {
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| 34 | constructor(index, end, type, numValue, strValue) {
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| 35 | this.index = index;
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| 36 | this.end = end;
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| 37 | this.type = type;
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| 38 | this.numValue = numValue;
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| 39 | this.strValue = strValue;
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| 40 | }
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| 41 | isCharacter(code) {
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| 42 | return this.type == TokenType.Character && this.numValue == code;
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| 43 | }
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| 44 | isNumber() {
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| 45 | return this.type == TokenType.Number;
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| 46 | }
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| 47 | isString() {
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| 48 | return this.type == TokenType.String;
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| 49 | }
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| 50 | isOperator(operator) {
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| 51 | return this.type == TokenType.Operator && this.strValue == operator;
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| 52 | }
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| 53 | isIdentifier() {
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| 54 | return this.type == TokenType.Identifier;
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| 55 | }
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| 56 | isPrivateIdentifier() {
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| 57 | return this.type == TokenType.PrivateIdentifier;
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| 58 | }
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| 59 | isKeyword() {
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| 60 | return this.type == TokenType.Keyword;
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| 61 | }
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| 62 | isKeywordLet() {
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| 63 | return this.type == TokenType.Keyword && this.strValue == 'let';
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| 64 | }
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| 65 | isKeywordAs() {
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| 66 | return this.type == TokenType.Keyword && this.strValue == 'as';
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| 67 | }
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| 68 | isKeywordNull() {
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| 69 | return this.type == TokenType.Keyword && this.strValue == 'null';
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| 70 | }
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| 71 | isKeywordUndefined() {
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| 72 | return this.type == TokenType.Keyword && this.strValue == 'undefined';
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| 73 | }
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| 74 | isKeywordTrue() {
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| 75 | return this.type == TokenType.Keyword && this.strValue == 'true';
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| 76 | }
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| 77 | isKeywordFalse() {
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| 78 | return this.type == TokenType.Keyword && this.strValue == 'false';
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| 79 | }
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| 80 | isKeywordThis() {
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| 81 | return this.type == TokenType.Keyword && this.strValue == 'this';
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| 82 | }
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| 83 | isError() {
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| 84 | return this.type == TokenType.Error;
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| 85 | }
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| 86 | toNumber() {
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| 87 | return this.type == TokenType.Number ? this.numValue : -1;
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| 88 | }
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| 89 | toString() {
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| 90 | switch (this.type) {
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| 91 | case TokenType.Character:
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| 92 | case TokenType.Identifier:
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| 93 | case TokenType.Keyword:
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| 94 | case TokenType.Operator:
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| 95 | case TokenType.PrivateIdentifier:
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| 96 | case TokenType.String:
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| 97 | case TokenType.Error:
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| 98 | return this.strValue;
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| 99 | case TokenType.Number:
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| 100 | return this.numValue.toString();
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| 101 | default:
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| 102 | return null;
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| 103 | }
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| 104 | }
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| 105 | }
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| 106 | function newCharacterToken(index, end, code) {
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| 107 | return new Token(index, end, TokenType.Character, code, String.fromCharCode(code));
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| 108 | }
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| 109 | function newIdentifierToken(index, end, text) {
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| 110 | return new Token(index, end, TokenType.Identifier, 0, text);
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| 111 | }
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| 112 | function newPrivateIdentifierToken(index, end, text) {
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| 113 | return new Token(index, end, TokenType.PrivateIdentifier, 0, text);
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| 114 | }
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| 115 | function newKeywordToken(index, end, text) {
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| 116 | return new Token(index, end, TokenType.Keyword, 0, text);
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| 117 | }
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| 118 | function newOperatorToken(index, end, text) {
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| 119 | return new Token(index, end, TokenType.Operator, 0, text);
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| 120 | }
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| 121 | function newStringToken(index, end, text) {
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| 122 | return new Token(index, end, TokenType.String, 0, text);
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| 123 | }
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| 124 | function newNumberToken(index, end, n) {
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| 125 | return new Token(index, end, TokenType.Number, n, '');
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| 126 | }
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| 127 | function newErrorToken(index, end, message) {
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| 128 | return new Token(index, end, TokenType.Error, 0, message);
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| 129 | }
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| 130 | export const EOF = new Token(-1, -1, TokenType.Character, 0, '');
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| 131 | class _Scanner {
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| 132 | constructor(input) {
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| 133 | this.input = input;
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| 134 | this.peek = 0;
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| 135 | this.index = -1;
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| 136 | this.length = input.length;
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| 137 | this.advance();
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| 138 | }
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| 139 | advance() {
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| 140 | this.peek = ++this.index >= this.length ? chars.$EOF : this.input.charCodeAt(this.index);
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| 141 | }
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| 142 | scanToken() {
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| 143 | const input = this.input, length = this.length;
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| 144 | let peek = this.peek, index = this.index;
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| 145 | // Skip whitespace.
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| 146 | while (peek <= chars.$SPACE) {
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| 147 | if (++index >= length) {
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| 148 | peek = chars.$EOF;
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| 149 | break;
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| 150 | }
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| 151 | else {
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| 152 | peek = input.charCodeAt(index);
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| 153 | }
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| 154 | }
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| 155 | this.peek = peek;
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| 156 | this.index = index;
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| 157 | if (index >= length) {
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| 158 | return null;
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| 159 | }
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| 160 | // Handle identifiers and numbers.
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| 161 | if (isIdentifierStart(peek))
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| 162 | return this.scanIdentifier();
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| 163 | if (chars.isDigit(peek))
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| 164 | return this.scanNumber(index);
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| 165 | const start = index;
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| 166 | switch (peek) {
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| 167 | case chars.$PERIOD:
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| 168 | this.advance();
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| 169 | return chars.isDigit(this.peek) ? this.scanNumber(start) :
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| 170 | newCharacterToken(start, this.index, chars.$PERIOD);
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| 171 | case chars.$LPAREN:
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| 172 | case chars.$RPAREN:
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| 173 | case chars.$LBRACE:
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| 174 | case chars.$RBRACE:
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| 175 | case chars.$LBRACKET:
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| 176 | case chars.$RBRACKET:
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| 177 | case chars.$COMMA:
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| 178 | case chars.$COLON:
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| 179 | case chars.$SEMICOLON:
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| 180 | return this.scanCharacter(start, peek);
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| 181 | case chars.$SQ:
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| 182 | case chars.$DQ:
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| 183 | return this.scanString();
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| 184 | case chars.$HASH:
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| 185 | return this.scanPrivateIdentifier();
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| 186 | case chars.$PLUS:
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| 187 | case chars.$MINUS:
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| 188 | case chars.$STAR:
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| 189 | case chars.$SLASH:
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| 190 | case chars.$PERCENT:
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| 191 | case chars.$CARET:
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| 192 | return this.scanOperator(start, String.fromCharCode(peek));
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| 193 | case chars.$QUESTION:
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| 194 | return this.scanQuestion(start);
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| 195 | case chars.$LT:
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| 196 | case chars.$GT:
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| 197 | return this.scanComplexOperator(start, String.fromCharCode(peek), chars.$EQ, '=');
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| 198 | case chars.$BANG:
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| 199 | case chars.$EQ:
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| 200 | return this.scanComplexOperator(start, String.fromCharCode(peek), chars.$EQ, '=', chars.$EQ, '=');
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| 201 | case chars.$AMPERSAND:
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| 202 | return this.scanComplexOperator(start, '&', chars.$AMPERSAND, '&');
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| 203 | case chars.$BAR:
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| 204 | return this.scanComplexOperator(start, '|', chars.$BAR, '|');
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| 205 | case chars.$NBSP:
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| 206 | while (chars.isWhitespace(this.peek))
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| 207 | this.advance();
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| 208 | return this.scanToken();
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| 209 | }
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| 210 | this.advance();
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| 211 | return this.error(`Unexpected character [${String.fromCharCode(peek)}]`, 0);
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| 212 | }
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| 213 | scanCharacter(start, code) {
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| 214 | this.advance();
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| 215 | return newCharacterToken(start, this.index, code);
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| 216 | }
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| 217 | scanOperator(start, str) {
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| 218 | this.advance();
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| 219 | return newOperatorToken(start, this.index, str);
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| 220 | }
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| 221 | /**
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| 222 | * Tokenize a 2/3 char long operator
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| 223 | *
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| 224 | * @param start start index in the expression
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| 225 | * @param one first symbol (always part of the operator)
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| 226 | * @param twoCode code point for the second symbol
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| 227 | * @param two second symbol (part of the operator when the second code point matches)
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| 228 | * @param threeCode code point for the third symbol
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| 229 | * @param three third symbol (part of the operator when provided and matches source expression)
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| 230 | */
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| 231 | scanComplexOperator(start, one, twoCode, two, threeCode, three) {
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| 232 | this.advance();
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| 233 | let str = one;
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| 234 | if (this.peek == twoCode) {
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| 235 | this.advance();
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| 236 | str += two;
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| 237 | }
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| 238 | if (threeCode != null && this.peek == threeCode) {
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| 239 | this.advance();
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| 240 | str += three;
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| 241 | }
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| 242 | return newOperatorToken(start, this.index, str);
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| 243 | }
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| 244 | scanIdentifier() {
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| 245 | const start = this.index;
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| 246 | this.advance();
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| 247 | while (isIdentifierPart(this.peek))
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| 248 | this.advance();
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| 249 | const str = this.input.substring(start, this.index);
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| 250 | return KEYWORDS.indexOf(str) > -1 ? newKeywordToken(start, this.index, str) :
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| 251 | newIdentifierToken(start, this.index, str);
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| 252 | }
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| 253 | /** Scans an ECMAScript private identifier. */
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| 254 | scanPrivateIdentifier() {
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| 255 | const start = this.index;
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| 256 | this.advance();
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| 257 | if (!isIdentifierStart(this.peek)) {
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| 258 | return this.error('Invalid character [#]', -1);
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| 259 | }
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| 260 | while (isIdentifierPart(this.peek))
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| 261 | this.advance();
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| 262 | const identifierName = this.input.substring(start, this.index);
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| 263 | return newPrivateIdentifierToken(start, this.index, identifierName);
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| 264 | }
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| 265 | scanNumber(start) {
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| 266 | let simple = (this.index === start);
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| 267 | let hasSeparators = false;
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| 268 | this.advance(); // Skip initial digit.
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| 269 | while (true) {
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| 270 | if (chars.isDigit(this.peek)) {
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| 271 | // Do nothing.
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| 272 | }
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| 273 | else if (this.peek === chars.$_) {
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| 274 | // Separators are only valid when they're surrounded by digits. E.g. `1_0_1` is
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| 275 | // valid while `_101` and `101_` are not. The separator can't be next to the decimal
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| 276 | // point or another separator either. Note that it's unlikely that we'll hit a case where
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| 277 | // the underscore is at the start, because that's a valid identifier and it will be picked
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| 278 | // up earlier in the parsing. We validate for it anyway just in case.
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| 279 | if (!chars.isDigit(this.input.charCodeAt(this.index - 1)) ||
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| 280 | !chars.isDigit(this.input.charCodeAt(this.index + 1))) {
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| 281 | return this.error('Invalid numeric separator', 0);
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| 282 | }
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| 283 | hasSeparators = true;
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| 284 | }
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| 285 | else if (this.peek === chars.$PERIOD) {
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| 286 | simple = false;
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| 287 | }
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| 288 | else if (isExponentStart(this.peek)) {
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| 289 | this.advance();
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| 290 | if (isExponentSign(this.peek))
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| 291 | this.advance();
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| 292 | if (!chars.isDigit(this.peek))
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| 293 | return this.error('Invalid exponent', -1);
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| 294 | simple = false;
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| 295 | }
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| 296 | else {
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| 297 | break;
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| 298 | }
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| 299 | this.advance();
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| 300 | }
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| 301 | let str = this.input.substring(start, this.index);
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| 302 | if (hasSeparators) {
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| 303 | str = str.replace(/_/g, '');
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| 304 | }
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| 305 | const value = simple ? parseIntAutoRadix(str) : parseFloat(str);
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| 306 | return newNumberToken(start, this.index, value);
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| 307 | }
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| 308 | scanString() {
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| 309 | const start = this.index;
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| 310 | const quote = this.peek;
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| 311 | this.advance(); // Skip initial quote.
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| 312 | let buffer = '';
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| 313 | let marker = this.index;
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| 314 | const input = this.input;
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| 315 | while (this.peek != quote) {
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| 316 | if (this.peek == chars.$BACKSLASH) {
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| 317 | buffer += input.substring(marker, this.index);
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| 318 | this.advance();
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| 319 | let unescapedCode;
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| 320 | // Workaround for TS2.1-introduced type strictness
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| 321 | this.peek = this.peek;
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| 322 | if (this.peek == chars.$u) {
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| 323 | // 4 character hex code for unicode character.
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| 324 | const hex = input.substring(this.index + 1, this.index + 5);
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| 325 | if (/^[0-9a-f]+$/i.test(hex)) {
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| 326 | unescapedCode = parseInt(hex, 16);
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| 327 | }
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| 328 | else {
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| 329 | return this.error(`Invalid unicode escape [\\u${hex}]`, 0);
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| 330 | }
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| 331 | for (let i = 0; i < 5; i++) {
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| 332 | this.advance();
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| 333 | }
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| 334 | }
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| 335 | else {
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| 336 | unescapedCode = unescape(this.peek);
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| 337 | this.advance();
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| 338 | }
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| 339 | buffer += String.fromCharCode(unescapedCode);
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| 340 | marker = this.index;
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| 341 | }
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| 342 | else if (this.peek == chars.$EOF) {
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| 343 | return this.error('Unterminated quote', 0);
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| 344 | }
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| 345 | else {
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| 346 | this.advance();
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| 347 | }
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| 348 | }
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| 349 | const last = input.substring(marker, this.index);
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| 350 | this.advance(); // Skip terminating quote.
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| 351 | return newStringToken(start, this.index, buffer + last);
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| 352 | }
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| 353 | scanQuestion(start) {
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| 354 | this.advance();
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| 355 | let str = '?';
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| 356 | // Either `a ?? b` or 'a?.b'.
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| 357 | if (this.peek === chars.$QUESTION || this.peek === chars.$PERIOD) {
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| 358 | str += this.peek === chars.$PERIOD ? '.' : '?';
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| 359 | this.advance();
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| 360 | }
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| 361 | return newOperatorToken(start, this.index, str);
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| 362 | }
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| 363 | error(message, offset) {
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| 364 | const position = this.index + offset;
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| 365 | return newErrorToken(position, this.index, `Lexer Error: ${message} at column ${position} in expression [${this.input}]`);
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| 366 | }
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| 367 | }
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| 368 | function isIdentifierStart(code) {
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| 369 | return (chars.$a <= code && code <= chars.$z) || (chars.$A <= code && code <= chars.$Z) ||
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| 370 | (code == chars.$_) || (code == chars.$$);
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| 371 | }
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| 372 | export function isIdentifier(input) {
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| 373 | if (input.length == 0)
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| 374 | return false;
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| 375 | const scanner = new _Scanner(input);
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| 376 | if (!isIdentifierStart(scanner.peek))
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| 377 | return false;
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| 378 | scanner.advance();
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| 379 | while (scanner.peek !== chars.$EOF) {
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| 380 | if (!isIdentifierPart(scanner.peek))
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| 381 | return false;
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| 382 | scanner.advance();
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| 383 | }
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| 384 | return true;
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| 385 | }
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| 386 | function isIdentifierPart(code) {
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| 387 | return chars.isAsciiLetter(code) || chars.isDigit(code) || (code == chars.$_) ||
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| 388 | (code == chars.$$);
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| 389 | }
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| 390 | function isExponentStart(code) {
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| 391 | return code == chars.$e || code == chars.$E;
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| 392 | }
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| 393 | function isExponentSign(code) {
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| 394 | return code == chars.$MINUS || code == chars.$PLUS;
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| 395 | }
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| 396 | function unescape(code) {
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| 397 | switch (code) {
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| 398 | case chars.$n:
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| 399 | return chars.$LF;
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| 400 | case chars.$f:
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| 401 | return chars.$FF;
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| 402 | case chars.$r:
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| 403 | return chars.$CR;
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| 404 | case chars.$t:
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| 405 | return chars.$TAB;
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| 406 | case chars.$v:
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| 407 | return chars.$VTAB;
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| 408 | default:
|
|---|
| 409 | return code;
|
|---|
| 410 | }
|
|---|
| 411 | }
|
|---|
| 412 | function 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 | }
|
|---|
| 419 | //# 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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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