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 | import { DEFAULT_INTERPOLATION_CONFIG } from '../ml_parser/interpolation_config';
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10 | import { AbsoluteSourceSpan, ASTWithSource, Binary, BindingPipe, Call, Chain, Conditional, EmptyExpr, ExpressionBinding, ImplicitReceiver, Interpolation, KeyedRead, KeyedWrite, LiteralArray, LiteralMap, LiteralPrimitive, NonNullAssert, ParserError, ParseSpan, PrefixNot, PropertyRead, PropertyWrite, Quote, RecursiveAstVisitor, SafeCall, SafeKeyedRead, SafePropertyRead, ThisReceiver, Unary, VariableBinding } from './ast';
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11 | import { EOF, isIdentifier, TokenType } from './lexer';
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12 | export class SplitInterpolation {
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13 | constructor(strings, expressions, offsets) {
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14 | this.strings = strings;
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15 | this.expressions = expressions;
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16 | this.offsets = offsets;
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17 | }
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18 | }
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19 | export class TemplateBindingParseResult {
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20 | constructor(templateBindings, warnings, errors) {
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21 | this.templateBindings = templateBindings;
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22 | this.warnings = warnings;
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23 | this.errors = errors;
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24 | }
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25 | }
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26 | export class Parser {
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27 | constructor(_lexer) {
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28 | this._lexer = _lexer;
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29 | this.errors = [];
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30 | }
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31 | parseAction(input, isAssignmentEvent, location, absoluteOffset, interpolationConfig = DEFAULT_INTERPOLATION_CONFIG) {
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32 | this._checkNoInterpolation(input, location, interpolationConfig);
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33 | const sourceToLex = this._stripComments(input);
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34 | const tokens = this._lexer.tokenize(sourceToLex);
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35 | let flags = 1 /* Action */;
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36 | if (isAssignmentEvent) {
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37 | flags |= 2 /* AssignmentEvent */;
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38 | }
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39 | const ast = new _ParseAST(input, location, absoluteOffset, tokens, flags, this.errors, 0).parseChain();
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40 | return new ASTWithSource(ast, input, location, absoluteOffset, this.errors);
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41 | }
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42 | parseBinding(input, location, absoluteOffset, interpolationConfig = DEFAULT_INTERPOLATION_CONFIG) {
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43 | const ast = this._parseBindingAst(input, location, absoluteOffset, interpolationConfig);
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44 | return new ASTWithSource(ast, input, location, absoluteOffset, this.errors);
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45 | }
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46 | checkSimpleExpression(ast) {
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47 | const checker = new SimpleExpressionChecker();
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48 | ast.visit(checker);
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49 | return checker.errors;
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50 | }
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51 | parseSimpleBinding(input, location, absoluteOffset, interpolationConfig = DEFAULT_INTERPOLATION_CONFIG) {
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52 | const ast = this._parseBindingAst(input, location, absoluteOffset, interpolationConfig);
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53 | const errors = this.checkSimpleExpression(ast);
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54 | if (errors.length > 0) {
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55 | this._reportError(`Host binding expression cannot contain ${errors.join(' ')}`, input, location);
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56 | }
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57 | return new ASTWithSource(ast, input, location, absoluteOffset, this.errors);
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58 | }
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59 | _reportError(message, input, errLocation, ctxLocation) {
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60 | this.errors.push(new ParserError(message, input, errLocation, ctxLocation));
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61 | }
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62 | _parseBindingAst(input, location, absoluteOffset, interpolationConfig) {
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63 | // Quotes expressions use 3rd-party expression language. We don't want to use
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64 | // our lexer or parser for that, so we check for that ahead of time.
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65 | const quote = this._parseQuote(input, location, absoluteOffset);
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66 | if (quote != null) {
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67 | return quote;
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68 | }
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69 | this._checkNoInterpolation(input, location, interpolationConfig);
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70 | const sourceToLex = this._stripComments(input);
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71 | const tokens = this._lexer.tokenize(sourceToLex);
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72 | return new _ParseAST(input, location, absoluteOffset, tokens, 0 /* None */, this.errors, 0)
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73 | .parseChain();
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74 | }
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75 | _parseQuote(input, location, absoluteOffset) {
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76 | if (input == null)
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77 | return null;
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78 | const prefixSeparatorIndex = input.indexOf(':');
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79 | if (prefixSeparatorIndex == -1)
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80 | return null;
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81 | const prefix = input.substring(0, prefixSeparatorIndex).trim();
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82 | if (!isIdentifier(prefix))
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83 | return null;
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84 | const uninterpretedExpression = input.substring(prefixSeparatorIndex + 1);
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85 | const span = new ParseSpan(0, input.length);
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86 | return new Quote(span, span.toAbsolute(absoluteOffset), prefix, uninterpretedExpression, location);
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87 | }
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88 | /**
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89 | * Parse microsyntax template expression and return a list of bindings or
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90 | * parsing errors in case the given expression is invalid.
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91 | *
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92 | * For example,
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93 | * ```
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94 | * <div *ngFor="let item of items">
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95 | * ^ ^ absoluteValueOffset for `templateValue`
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96 | * absoluteKeyOffset for `templateKey`
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97 | * ```
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98 | * contains three bindings:
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99 | * 1. ngFor -> null
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100 | * 2. item -> NgForOfContext.$implicit
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101 | * 3. ngForOf -> items
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102 | *
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103 | * This is apparent from the de-sugared template:
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104 | * ```
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105 | * <ng-template ngFor let-item [ngForOf]="items">
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106 | * ```
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107 | *
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108 | * @param templateKey name of directive, without the * prefix. For example: ngIf, ngFor
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109 | * @param templateValue RHS of the microsyntax attribute
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110 | * @param templateUrl template filename if it's external, component filename if it's inline
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111 | * @param absoluteKeyOffset start of the `templateKey`
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112 | * @param absoluteValueOffset start of the `templateValue`
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113 | */
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114 | parseTemplateBindings(templateKey, templateValue, templateUrl, absoluteKeyOffset, absoluteValueOffset) {
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115 | const tokens = this._lexer.tokenize(templateValue);
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116 | const parser = new _ParseAST(templateValue, templateUrl, absoluteValueOffset, tokens, 0 /* None */, this.errors, 0 /* relative offset */);
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117 | return parser.parseTemplateBindings({
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118 | source: templateKey,
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119 | span: new AbsoluteSourceSpan(absoluteKeyOffset, absoluteKeyOffset + templateKey.length),
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120 | });
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121 | }
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122 | parseInterpolation(input, location, absoluteOffset, interpolatedTokens, interpolationConfig = DEFAULT_INTERPOLATION_CONFIG) {
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123 | const { strings, expressions, offsets } = this.splitInterpolation(input, location, interpolatedTokens, interpolationConfig);
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124 | if (expressions.length === 0)
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125 | return null;
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126 | const expressionNodes = [];
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127 | for (let i = 0; i < expressions.length; ++i) {
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128 | const expressionText = expressions[i].text;
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129 | const sourceToLex = this._stripComments(expressionText);
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130 | const tokens = this._lexer.tokenize(sourceToLex);
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131 | const ast = new _ParseAST(input, location, absoluteOffset, tokens, 0 /* None */, this.errors, offsets[i])
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132 | .parseChain();
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133 | expressionNodes.push(ast);
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134 | }
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135 | return this.createInterpolationAst(strings.map(s => s.text), expressionNodes, input, location, absoluteOffset);
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136 | }
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137 | /**
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138 | * Similar to `parseInterpolation`, but treats the provided string as a single expression
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139 | * element that would normally appear within the interpolation prefix and suffix (`{{` and `}}`).
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140 | * This is used for parsing the switch expression in ICUs.
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141 | */
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142 | parseInterpolationExpression(expression, location, absoluteOffset) {
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143 | const sourceToLex = this._stripComments(expression);
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144 | const tokens = this._lexer.tokenize(sourceToLex);
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145 | const ast = new _ParseAST(expression, location, absoluteOffset, tokens, 0 /* None */, this.errors, 0)
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146 | .parseChain();
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147 | const strings = ['', '']; // The prefix and suffix strings are both empty
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148 | return this.createInterpolationAst(strings, [ast], expression, location, absoluteOffset);
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149 | }
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150 | createInterpolationAst(strings, expressions, input, location, absoluteOffset) {
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151 | const span = new ParseSpan(0, input.length);
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152 | const interpolation = new Interpolation(span, span.toAbsolute(absoluteOffset), strings, expressions);
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153 | return new ASTWithSource(interpolation, input, location, absoluteOffset, this.errors);
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154 | }
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155 | /**
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156 | * Splits a string of text into "raw" text segments and expressions present in interpolations in
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157 | * the string.
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158 | * Returns `null` if there are no interpolations, otherwise a
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159 | * `SplitInterpolation` with splits that look like
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160 | * <raw text> <expression> <raw text> ... <raw text> <expression> <raw text>
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161 | */
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162 | splitInterpolation(input, location, interpolatedTokens, interpolationConfig = DEFAULT_INTERPOLATION_CONFIG) {
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163 | const strings = [];
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164 | const expressions = [];
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165 | const offsets = [];
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166 | const inputToTemplateIndexMap = interpolatedTokens ? getIndexMapForOriginalTemplate(interpolatedTokens) : null;
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167 | let i = 0;
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168 | let atInterpolation = false;
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169 | let extendLastString = false;
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170 | let { start: interpStart, end: interpEnd } = interpolationConfig;
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171 | while (i < input.length) {
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172 | if (!atInterpolation) {
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173 | // parse until starting {{
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174 | const start = i;
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175 | i = input.indexOf(interpStart, i);
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176 | if (i === -1) {
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177 | i = input.length;
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178 | }
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179 | const text = input.substring(start, i);
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180 | strings.push({ text, start, end: i });
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181 | atInterpolation = true;
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182 | }
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183 | else {
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184 | // parse from starting {{ to ending }} while ignoring content inside quotes.
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185 | const fullStart = i;
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186 | const exprStart = fullStart + interpStart.length;
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187 | const exprEnd = this._getInterpolationEndIndex(input, interpEnd, exprStart);
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188 | if (exprEnd === -1) {
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189 | // Could not find the end of the interpolation; do not parse an expression.
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190 | // Instead we should extend the content on the last raw string.
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191 | atInterpolation = false;
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192 | extendLastString = true;
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193 | break;
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194 | }
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195 | const fullEnd = exprEnd + interpEnd.length;
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196 | const text = input.substring(exprStart, exprEnd);
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197 | if (text.trim().length === 0) {
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198 | this._reportError('Blank expressions are not allowed in interpolated strings', input, `at column ${i} in`, location);
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199 | }
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200 | expressions.push({ text, start: fullStart, end: fullEnd });
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201 | const startInOriginalTemplate = inputToTemplateIndexMap?.get(fullStart) ?? fullStart;
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202 | const offset = startInOriginalTemplate + interpStart.length;
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203 | offsets.push(offset);
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204 | i = fullEnd;
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205 | atInterpolation = false;
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206 | }
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207 | }
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208 | if (!atInterpolation) {
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209 | // If we are now at a text section, add the remaining content as a raw string.
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210 | if (extendLastString) {
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211 | const piece = strings[strings.length - 1];
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212 | piece.text += input.substring(i);
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213 | piece.end = input.length;
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214 | }
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215 | else {
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216 | strings.push({ text: input.substring(i), start: i, end: input.length });
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217 | }
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218 | }
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219 | return new SplitInterpolation(strings, expressions, offsets);
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220 | }
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221 | wrapLiteralPrimitive(input, location, absoluteOffset) {
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222 | const span = new ParseSpan(0, input == null ? 0 : input.length);
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223 | return new ASTWithSource(new LiteralPrimitive(span, span.toAbsolute(absoluteOffset), input), input, location, absoluteOffset, this.errors);
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224 | }
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225 | _stripComments(input) {
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226 | const i = this._commentStart(input);
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227 | return i != null ? input.substring(0, i) : input;
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228 | }
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229 | _commentStart(input) {
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230 | let outerQuote = null;
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231 | for (let i = 0; i < input.length - 1; i++) {
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232 | const char = input.charCodeAt(i);
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233 | const nextChar = input.charCodeAt(i + 1);
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234 | if (char === chars.$SLASH && nextChar == chars.$SLASH && outerQuote == null)
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235 | return i;
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236 | if (outerQuote === char) {
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237 | outerQuote = null;
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238 | }
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239 | else if (outerQuote == null && chars.isQuote(char)) {
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240 | outerQuote = char;
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241 | }
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242 | }
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243 | return null;
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244 | }
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245 | _checkNoInterpolation(input, location, { start, end }) {
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246 | let startIndex = -1;
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247 | let endIndex = -1;
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248 | for (const charIndex of this._forEachUnquotedChar(input, 0)) {
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249 | if (startIndex === -1) {
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250 | if (input.startsWith(start)) {
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251 | startIndex = charIndex;
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252 | }
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253 | }
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254 | else {
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255 | endIndex = this._getInterpolationEndIndex(input, end, charIndex);
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256 | if (endIndex > -1) {
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257 | break;
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258 | }
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259 | }
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260 | }
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261 | if (startIndex > -1 && endIndex > -1) {
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262 | this._reportError(`Got interpolation (${start}${end}) where expression was expected`, input, `at column ${startIndex} in`, location);
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263 | }
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264 | }
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265 | /**
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266 | * Finds the index of the end of an interpolation expression
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267 | * while ignoring comments and quoted content.
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268 | */
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269 | _getInterpolationEndIndex(input, expressionEnd, start) {
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270 | for (const charIndex of this._forEachUnquotedChar(input, start)) {
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271 | if (input.startsWith(expressionEnd, charIndex)) {
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272 | return charIndex;
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273 | }
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274 | // Nothing else in the expression matters after we've
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275 | // hit a comment so look directly for the end token.
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276 | if (input.startsWith('//', charIndex)) {
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277 | return input.indexOf(expressionEnd, charIndex);
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278 | }
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279 | }
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280 | return -1;
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281 | }
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282 | /**
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283 | * Generator used to iterate over the character indexes of a string that are outside of quotes.
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284 | * @param input String to loop through.
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285 | * @param start Index within the string at which to start.
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286 | */
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287 | *_forEachUnquotedChar(input, start) {
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288 | let currentQuote = null;
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289 | let escapeCount = 0;
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290 | for (let i = start; i < input.length; i++) {
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291 | const char = input[i];
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292 | // Skip the characters inside quotes. Note that we only care about the outer-most
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293 | // quotes matching up and we need to account for escape characters.
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294 | if (chars.isQuote(input.charCodeAt(i)) && (currentQuote === null || currentQuote === char) &&
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295 | escapeCount % 2 === 0) {
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296 | currentQuote = currentQuote === null ? char : null;
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297 | }
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298 | else if (currentQuote === null) {
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299 | yield i;
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300 | }
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301 | escapeCount = char === '\\' ? escapeCount + 1 : 0;
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302 | }
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303 | }
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304 | }
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305 | /** Describes a stateful context an expression parser is in. */
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306 | var ParseContextFlags;
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307 | (function (ParseContextFlags) {
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308 | ParseContextFlags[ParseContextFlags["None"] = 0] = "None";
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309 | /**
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310 | * A Writable context is one in which a value may be written to an lvalue.
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311 | * For example, after we see a property access, we may expect a write to the
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312 | * property via the "=" operator.
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313 | * prop
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314 | * ^ possible "=" after
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315 | */
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316 | ParseContextFlags[ParseContextFlags["Writable"] = 1] = "Writable";
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317 | })(ParseContextFlags || (ParseContextFlags = {}));
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318 | export class _ParseAST {
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319 | constructor(input, location, absoluteOffset, tokens, parseFlags, errors, offset) {
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320 | this.input = input;
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321 | this.location = location;
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322 | this.absoluteOffset = absoluteOffset;
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323 | this.tokens = tokens;
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324 | this.parseFlags = parseFlags;
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325 | this.errors = errors;
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326 | this.offset = offset;
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327 | this.rparensExpected = 0;
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328 | this.rbracketsExpected = 0;
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329 | this.rbracesExpected = 0;
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330 | this.context = ParseContextFlags.None;
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331 | // Cache of expression start and input indeces to the absolute source span they map to, used to
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332 | // prevent creating superfluous source spans in `sourceSpan`.
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333 | // A serial of the expression start and input index is used for mapping because both are stateful
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334 | // and may change for subsequent expressions visited by the parser.
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335 | this.sourceSpanCache = new Map();
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336 | this.index = 0;
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337 | }
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338 | peek(offset) {
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339 | const i = this.index + offset;
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340 | return i < this.tokens.length ? this.tokens[i] : EOF;
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341 | }
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342 | get next() {
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343 | return this.peek(0);
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344 | }
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345 | /** Whether all the parser input has been processed. */
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346 | get atEOF() {
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347 | return this.index >= this.tokens.length;
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348 | }
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349 | /**
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350 | * Index of the next token to be processed, or the end of the last token if all have been
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351 | * processed.
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352 | */
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353 | get inputIndex() {
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354 | return this.atEOF ? this.currentEndIndex : this.next.index + this.offset;
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355 | }
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356 | /**
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357 | * End index of the last processed token, or the start of the first token if none have been
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358 | * processed.
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359 | */
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360 | get currentEndIndex() {
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361 | if (this.index > 0) {
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362 | const curToken = this.peek(-1);
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363 | return curToken.end + this.offset;
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364 | }
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365 | // No tokens have been processed yet; return the next token's start or the length of the input
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366 | // if there is no token.
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367 | if (this.tokens.length === 0) {
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368 | return this.input.length + this.offset;
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369 | }
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370 | return this.next.index + this.offset;
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371 | }
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372 | /**
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373 | * Returns the absolute offset of the start of the current token.
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374 | */
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375 | get currentAbsoluteOffset() {
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376 | return this.absoluteOffset + this.inputIndex;
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377 | }
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378 | /**
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379 | * Retrieve a `ParseSpan` from `start` to the current position (or to `artificialEndIndex` if
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380 | * provided).
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381 | *
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382 | * @param start Position from which the `ParseSpan` will start.
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383 | * @param artificialEndIndex Optional ending index to be used if provided (and if greater than the
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384 | * natural ending index)
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385 | */
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386 | span(start, artificialEndIndex) {
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387 | let endIndex = this.currentEndIndex;
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388 | if (artificialEndIndex !== undefined && artificialEndIndex > this.currentEndIndex) {
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389 | endIndex = artificialEndIndex;
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390 | }
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391 | // In some unusual parsing scenarios (like when certain tokens are missing and an `EmptyExpr` is
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392 | // being created), the current token may already be advanced beyond the `currentEndIndex`. This
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393 | // appears to be a deep-seated parser bug.
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394 | //
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395 | // As a workaround for now, swap the start and end indices to ensure a valid `ParseSpan`.
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396 | // TODO(alxhub): fix the bug upstream in the parser state, and remove this workaround.
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397 | if (start > endIndex) {
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398 | const tmp = endIndex;
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399 | endIndex = start;
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400 | start = tmp;
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401 | }
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402 | return new ParseSpan(start, endIndex);
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403 | }
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404 | sourceSpan(start, artificialEndIndex) {
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405 | const serial = `${start}@${this.inputIndex}:${artificialEndIndex}`;
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406 | if (!this.sourceSpanCache.has(serial)) {
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407 | this.sourceSpanCache.set(serial, this.span(start, artificialEndIndex).toAbsolute(this.absoluteOffset));
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408 | }
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409 | return this.sourceSpanCache.get(serial);
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410 | }
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411 | advance() {
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412 | this.index++;
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413 | }
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414 | /**
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415 | * Executes a callback in the provided context.
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416 | */
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417 | withContext(context, cb) {
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418 | this.context |= context;
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419 | const ret = cb();
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420 | this.context ^= context;
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421 | return ret;
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422 | }
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423 | consumeOptionalCharacter(code) {
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424 | if (this.next.isCharacter(code)) {
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425 | this.advance();
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426 | return true;
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427 | }
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428 | else {
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429 | return false;
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430 | }
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431 | }
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432 | peekKeywordLet() {
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433 | return this.next.isKeywordLet();
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434 | }
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435 | peekKeywordAs() {
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436 | return this.next.isKeywordAs();
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437 | }
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438 | /**
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439 | * Consumes an expected character, otherwise emits an error about the missing expected character
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440 | * and skips over the token stream until reaching a recoverable point.
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441 | *
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442 | * See `this.error` and `this.skip` for more details.
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443 | */
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444 | expectCharacter(code) {
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445 | if (this.consumeOptionalCharacter(code))
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446 | return;
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447 | this.error(`Missing expected ${String.fromCharCode(code)}`);
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448 | }
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449 | consumeOptionalOperator(op) {
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450 | if (this.next.isOperator(op)) {
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451 | this.advance();
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452 | return true;
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453 | }
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454 | else {
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455 | return false;
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456 | }
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457 | }
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458 | expectOperator(operator) {
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459 | if (this.consumeOptionalOperator(operator))
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460 | return;
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461 | this.error(`Missing expected operator ${operator}`);
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462 | }
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463 | prettyPrintToken(tok) {
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464 | return tok === EOF ? 'end of input' : `token ${tok}`;
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465 | }
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466 | expectIdentifierOrKeyword() {
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467 | const n = this.next;
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468 | if (!n.isIdentifier() && !n.isKeyword()) {
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469 | if (n.isPrivateIdentifier()) {
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470 | this._reportErrorForPrivateIdentifier(n, 'expected identifier or keyword');
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471 | }
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472 | else {
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473 | this.error(`Unexpected ${this.prettyPrintToken(n)}, expected identifier or keyword`);
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474 | }
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475 | return null;
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476 | }
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477 | this.advance();
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478 | return n.toString();
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479 | }
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480 | expectIdentifierOrKeywordOrString() {
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481 | const n = this.next;
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482 | if (!n.isIdentifier() && !n.isKeyword() && !n.isString()) {
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483 | if (n.isPrivateIdentifier()) {
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484 | this._reportErrorForPrivateIdentifier(n, 'expected identifier, keyword or string');
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485 | }
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486 | else {
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487 | this.error(`Unexpected ${this.prettyPrintToken(n)}, expected identifier, keyword, or string`);
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488 | }
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489 | return '';
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490 | }
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491 | this.advance();
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492 | return n.toString();
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493 | }
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494 | parseChain() {
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495 | const exprs = [];
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496 | const start = this.inputIndex;
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497 | while (this.index < this.tokens.length) {
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498 | const expr = this.parsePipe();
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499 | exprs.push(expr);
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500 | if (this.consumeOptionalCharacter(chars.$SEMICOLON)) {
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501 | if (!(this.parseFlags & 1 /* Action */)) {
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502 | this.error('Binding expression cannot contain chained expression');
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503 | }
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504 | while (this.consumeOptionalCharacter(chars.$SEMICOLON)) {
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505 | } // read all semicolons
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506 | }
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507 | else if (this.index < this.tokens.length) {
|
508 | this.error(`Unexpected token '${this.next}'`);
|
509 | }
|
510 | }
|
511 | if (exprs.length == 0) {
|
512 | // We have no expressions so create an empty expression that spans the entire input length
|
513 | const artificialStart = this.offset;
|
514 | const artificialEnd = this.offset + this.input.length;
|
515 | return new EmptyExpr(this.span(artificialStart, artificialEnd), this.sourceSpan(artificialStart, artificialEnd));
|
516 | }
|
517 | if (exprs.length == 1)
|
518 | return exprs[0];
|
519 | return new Chain(this.span(start), this.sourceSpan(start), exprs);
|
520 | }
|
521 | parsePipe() {
|
522 | const start = this.inputIndex;
|
523 | let result = this.parseExpression();
|
524 | if (this.consumeOptionalOperator('|')) {
|
525 | if (this.parseFlags & 1 /* Action */) {
|
526 | this.error('Cannot have a pipe in an action expression');
|
527 | }
|
528 | do {
|
529 | const nameStart = this.inputIndex;
|
530 | let nameId = this.expectIdentifierOrKeyword();
|
531 | let nameSpan;
|
532 | let fullSpanEnd = undefined;
|
533 | if (nameId !== null) {
|
534 | nameSpan = this.sourceSpan(nameStart);
|
535 | }
|
536 | else {
|
537 | // No valid identifier was found, so we'll assume an empty pipe name ('').
|
538 | nameId = '';
|
539 | // However, there may have been whitespace present between the pipe character and the next
|
540 | // token in the sequence (or the end of input). We want to track this whitespace so that
|
541 | // the `BindingPipe` we produce covers not just the pipe character, but any trailing
|
542 | // whitespace beyond it. Another way of thinking about this is that the zero-length name
|
543 | // is assumed to be at the end of any whitespace beyond the pipe character.
|
544 | //
|
545 | // Therefore, we push the end of the `ParseSpan` for this pipe all the way up to the
|
546 | // beginning of the next token, or until the end of input if the next token is EOF.
|
547 | fullSpanEnd = this.next.index !== -1 ? this.next.index : this.input.length + this.offset;
|
548 | // The `nameSpan` for an empty pipe name is zero-length at the end of any whitespace
|
549 | // beyond the pipe character.
|
550 | nameSpan = new ParseSpan(fullSpanEnd, fullSpanEnd).toAbsolute(this.absoluteOffset);
|
551 | }
|
552 | const args = [];
|
553 | while (this.consumeOptionalCharacter(chars.$COLON)) {
|
554 | args.push(this.parseExpression());
|
555 | // If there are additional expressions beyond the name, then the artificial end for the
|
556 | // name is no longer relevant.
|
557 | }
|
558 | result = new BindingPipe(this.span(start), this.sourceSpan(start, fullSpanEnd), result, nameId, args, nameSpan);
|
559 | } while (this.consumeOptionalOperator('|'));
|
560 | }
|
561 | return result;
|
562 | }
|
563 | parseExpression() {
|
564 | return this.parseConditional();
|
565 | }
|
566 | parseConditional() {
|
567 | const start = this.inputIndex;
|
568 | const result = this.parseLogicalOr();
|
569 | if (this.consumeOptionalOperator('?')) {
|
570 | const yes = this.parsePipe();
|
571 | let no;
|
572 | if (!this.consumeOptionalCharacter(chars.$COLON)) {
|
573 | const end = this.inputIndex;
|
574 | const expression = this.input.substring(start, end);
|
575 | this.error(`Conditional expression ${expression} requires all 3 expressions`);
|
576 | no = new EmptyExpr(this.span(start), this.sourceSpan(start));
|
577 | }
|
578 | else {
|
579 | no = this.parsePipe();
|
580 | }
|
581 | return new Conditional(this.span(start), this.sourceSpan(start), result, yes, no);
|
582 | }
|
583 | else {
|
584 | return result;
|
585 | }
|
586 | }
|
587 | parseLogicalOr() {
|
588 | // '||'
|
589 | const start = this.inputIndex;
|
590 | let result = this.parseLogicalAnd();
|
591 | while (this.consumeOptionalOperator('||')) {
|
592 | const right = this.parseLogicalAnd();
|
593 | result = new Binary(this.span(start), this.sourceSpan(start), '||', result, right);
|
594 | }
|
595 | return result;
|
596 | }
|
597 | parseLogicalAnd() {
|
598 | // '&&'
|
599 | const start = this.inputIndex;
|
600 | let result = this.parseNullishCoalescing();
|
601 | while (this.consumeOptionalOperator('&&')) {
|
602 | const right = this.parseNullishCoalescing();
|
603 | result = new Binary(this.span(start), this.sourceSpan(start), '&&', result, right);
|
604 | }
|
605 | return result;
|
606 | }
|
607 | parseNullishCoalescing() {
|
608 | // '??'
|
609 | const start = this.inputIndex;
|
610 | let result = this.parseEquality();
|
611 | while (this.consumeOptionalOperator('??')) {
|
612 | const right = this.parseEquality();
|
613 | result = new Binary(this.span(start), this.sourceSpan(start), '??', result, right);
|
614 | }
|
615 | return result;
|
616 | }
|
617 | parseEquality() {
|
618 | // '==','!=','===','!=='
|
619 | const start = this.inputIndex;
|
620 | let result = this.parseRelational();
|
621 | while (this.next.type == TokenType.Operator) {
|
622 | const operator = this.next.strValue;
|
623 | switch (operator) {
|
624 | case '==':
|
625 | case '===':
|
626 | case '!=':
|
627 | case '!==':
|
628 | this.advance();
|
629 | const right = this.parseRelational();
|
630 | result = new Binary(this.span(start), this.sourceSpan(start), operator, result, right);
|
631 | continue;
|
632 | }
|
633 | break;
|
634 | }
|
635 | return result;
|
636 | }
|
637 | parseRelational() {
|
638 | // '<', '>', '<=', '>='
|
639 | const start = this.inputIndex;
|
640 | let result = this.parseAdditive();
|
641 | while (this.next.type == TokenType.Operator) {
|
642 | const operator = this.next.strValue;
|
643 | switch (operator) {
|
644 | case '<':
|
645 | case '>':
|
646 | case '<=':
|
647 | case '>=':
|
648 | this.advance();
|
649 | const right = this.parseAdditive();
|
650 | result = new Binary(this.span(start), this.sourceSpan(start), operator, result, right);
|
651 | continue;
|
652 | }
|
653 | break;
|
654 | }
|
655 | return result;
|
656 | }
|
657 | parseAdditive() {
|
658 | // '+', '-'
|
659 | const start = this.inputIndex;
|
660 | let result = this.parseMultiplicative();
|
661 | while (this.next.type == TokenType.Operator) {
|
662 | const operator = this.next.strValue;
|
663 | switch (operator) {
|
664 | case '+':
|
665 | case '-':
|
666 | this.advance();
|
667 | let right = this.parseMultiplicative();
|
668 | result = new Binary(this.span(start), this.sourceSpan(start), operator, result, right);
|
669 | continue;
|
670 | }
|
671 | break;
|
672 | }
|
673 | return result;
|
674 | }
|
675 | parseMultiplicative() {
|
676 | // '*', '%', '/'
|
677 | const start = this.inputIndex;
|
678 | let result = this.parsePrefix();
|
679 | while (this.next.type == TokenType.Operator) {
|
680 | const operator = this.next.strValue;
|
681 | switch (operator) {
|
682 | case '*':
|
683 | case '%':
|
684 | case '/':
|
685 | this.advance();
|
686 | let right = this.parsePrefix();
|
687 | result = new Binary(this.span(start), this.sourceSpan(start), operator, result, right);
|
688 | continue;
|
689 | }
|
690 | break;
|
691 | }
|
692 | return result;
|
693 | }
|
694 | parsePrefix() {
|
695 | if (this.next.type == TokenType.Operator) {
|
696 | const start = this.inputIndex;
|
697 | const operator = this.next.strValue;
|
698 | let result;
|
699 | switch (operator) {
|
700 | case '+':
|
701 | this.advance();
|
702 | result = this.parsePrefix();
|
703 | return Unary.createPlus(this.span(start), this.sourceSpan(start), result);
|
704 | case '-':
|
705 | this.advance();
|
706 | result = this.parsePrefix();
|
707 | return Unary.createMinus(this.span(start), this.sourceSpan(start), result);
|
708 | case '!':
|
709 | this.advance();
|
710 | result = this.parsePrefix();
|
711 | return new PrefixNot(this.span(start), this.sourceSpan(start), result);
|
712 | }
|
713 | }
|
714 | return this.parseCallChain();
|
715 | }
|
716 | parseCallChain() {
|
717 | const start = this.inputIndex;
|
718 | let result = this.parsePrimary();
|
719 | while (true) {
|
720 | if (this.consumeOptionalCharacter(chars.$PERIOD)) {
|
721 | result = this.parseAccessMember(result, start, false);
|
722 | }
|
723 | else if (this.consumeOptionalOperator('?.')) {
|
724 | if (this.consumeOptionalCharacter(chars.$LPAREN)) {
|
725 | result = this.parseCall(result, start, true);
|
726 | }
|
727 | else {
|
728 | result = this.consumeOptionalCharacter(chars.$LBRACKET) ?
|
729 | this.parseKeyedReadOrWrite(result, start, true) :
|
730 | this.parseAccessMember(result, start, true);
|
731 | }
|
732 | }
|
733 | else if (this.consumeOptionalCharacter(chars.$LBRACKET)) {
|
734 | result = this.parseKeyedReadOrWrite(result, start, false);
|
735 | }
|
736 | else if (this.consumeOptionalCharacter(chars.$LPAREN)) {
|
737 | result = this.parseCall(result, start, false);
|
738 | }
|
739 | else if (this.consumeOptionalOperator('!')) {
|
740 | result = new NonNullAssert(this.span(start), this.sourceSpan(start), result);
|
741 | }
|
742 | else {
|
743 | return result;
|
744 | }
|
745 | }
|
746 | }
|
747 | parsePrimary() {
|
748 | const start = this.inputIndex;
|
749 | if (this.consumeOptionalCharacter(chars.$LPAREN)) {
|
750 | this.rparensExpected++;
|
751 | const result = this.parsePipe();
|
752 | this.rparensExpected--;
|
753 | this.expectCharacter(chars.$RPAREN);
|
754 | return result;
|
755 | }
|
756 | else if (this.next.isKeywordNull()) {
|
757 | this.advance();
|
758 | return new LiteralPrimitive(this.span(start), this.sourceSpan(start), null);
|
759 | }
|
760 | else if (this.next.isKeywordUndefined()) {
|
761 | this.advance();
|
762 | return new LiteralPrimitive(this.span(start), this.sourceSpan(start), void 0);
|
763 | }
|
764 | else if (this.next.isKeywordTrue()) {
|
765 | this.advance();
|
766 | return new LiteralPrimitive(this.span(start), this.sourceSpan(start), true);
|
767 | }
|
768 | else if (this.next.isKeywordFalse()) {
|
769 | this.advance();
|
770 | return new LiteralPrimitive(this.span(start), this.sourceSpan(start), false);
|
771 | }
|
772 | else if (this.next.isKeywordThis()) {
|
773 | this.advance();
|
774 | return new ThisReceiver(this.span(start), this.sourceSpan(start));
|
775 | }
|
776 | else if (this.consumeOptionalCharacter(chars.$LBRACKET)) {
|
777 | this.rbracketsExpected++;
|
778 | const elements = this.parseExpressionList(chars.$RBRACKET);
|
779 | this.rbracketsExpected--;
|
780 | this.expectCharacter(chars.$RBRACKET);
|
781 | return new LiteralArray(this.span(start), this.sourceSpan(start), elements);
|
782 | }
|
783 | else if (this.next.isCharacter(chars.$LBRACE)) {
|
784 | return this.parseLiteralMap();
|
785 | }
|
786 | else if (this.next.isIdentifier()) {
|
787 | return this.parseAccessMember(new ImplicitReceiver(this.span(start), this.sourceSpan(start)), start, false);
|
788 | }
|
789 | else if (this.next.isNumber()) {
|
790 | const value = this.next.toNumber();
|
791 | this.advance();
|
792 | return new LiteralPrimitive(this.span(start), this.sourceSpan(start), value);
|
793 | }
|
794 | else if (this.next.isString()) {
|
795 | const literalValue = this.next.toString();
|
796 | this.advance();
|
797 | return new LiteralPrimitive(this.span(start), this.sourceSpan(start), literalValue);
|
798 | }
|
799 | else if (this.next.isPrivateIdentifier()) {
|
800 | this._reportErrorForPrivateIdentifier(this.next, null);
|
801 | return new EmptyExpr(this.span(start), this.sourceSpan(start));
|
802 | }
|
803 | else if (this.index >= this.tokens.length) {
|
804 | this.error(`Unexpected end of expression: ${this.input}`);
|
805 | return new EmptyExpr(this.span(start), this.sourceSpan(start));
|
806 | }
|
807 | else {
|
808 | this.error(`Unexpected token ${this.next}`);
|
809 | return new EmptyExpr(this.span(start), this.sourceSpan(start));
|
810 | }
|
811 | }
|
812 | parseExpressionList(terminator) {
|
813 | const result = [];
|
814 | do {
|
815 | if (!this.next.isCharacter(terminator)) {
|
816 | result.push(this.parsePipe());
|
817 | }
|
818 | else {
|
819 | break;
|
820 | }
|
821 | } while (this.consumeOptionalCharacter(chars.$COMMA));
|
822 | return result;
|
823 | }
|
824 | parseLiteralMap() {
|
825 | const keys = [];
|
826 | const values = [];
|
827 | const start = this.inputIndex;
|
828 | this.expectCharacter(chars.$LBRACE);
|
829 | if (!this.consumeOptionalCharacter(chars.$RBRACE)) {
|
830 | this.rbracesExpected++;
|
831 | do {
|
832 | const keyStart = this.inputIndex;
|
833 | const quoted = this.next.isString();
|
834 | const key = this.expectIdentifierOrKeywordOrString();
|
835 | keys.push({ key, quoted });
|
836 | // Properties with quoted keys can't use the shorthand syntax.
|
837 | if (quoted) {
|
838 | this.expectCharacter(chars.$COLON);
|
839 | values.push(this.parsePipe());
|
840 | }
|
841 | else if (this.consumeOptionalCharacter(chars.$COLON)) {
|
842 | values.push(this.parsePipe());
|
843 | }
|
844 | else {
|
845 | const span = this.span(keyStart);
|
846 | const sourceSpan = this.sourceSpan(keyStart);
|
847 | values.push(new PropertyRead(span, sourceSpan, sourceSpan, new ImplicitReceiver(span, sourceSpan), key));
|
848 | }
|
849 | } while (this.consumeOptionalCharacter(chars.$COMMA));
|
850 | this.rbracesExpected--;
|
851 | this.expectCharacter(chars.$RBRACE);
|
852 | }
|
853 | return new LiteralMap(this.span(start), this.sourceSpan(start), keys, values);
|
854 | }
|
855 | parseAccessMember(readReceiver, start, isSafe) {
|
856 | const nameStart = this.inputIndex;
|
857 | const id = this.withContext(ParseContextFlags.Writable, () => {
|
858 | const id = this.expectIdentifierOrKeyword() ?? '';
|
859 | if (id.length === 0) {
|
860 | this.error(`Expected identifier for property access`, readReceiver.span.end);
|
861 | }
|
862 | return id;
|
863 | });
|
864 | const nameSpan = this.sourceSpan(nameStart);
|
865 | let receiver;
|
866 | if (isSafe) {
|
867 | if (this.consumeOptionalAssignment()) {
|
868 | this.error('The \'?.\' operator cannot be used in the assignment');
|
869 | receiver = new EmptyExpr(this.span(start), this.sourceSpan(start));
|
870 | }
|
871 | else {
|
872 | receiver = new SafePropertyRead(this.span(start), this.sourceSpan(start), nameSpan, readReceiver, id);
|
873 | }
|
874 | }
|
875 | else {
|
876 | if (this.consumeOptionalAssignment()) {
|
877 | if (!(this.parseFlags & 1 /* Action */)) {
|
878 | this.error('Bindings cannot contain assignments');
|
879 | return new EmptyExpr(this.span(start), this.sourceSpan(start));
|
880 | }
|
881 | const value = this.parseConditional();
|
882 | receiver = new PropertyWrite(this.span(start), this.sourceSpan(start), nameSpan, readReceiver, id, value);
|
883 | }
|
884 | else {
|
885 | receiver =
|
886 | new PropertyRead(this.span(start), this.sourceSpan(start), nameSpan, readReceiver, id);
|
887 | }
|
888 | }
|
889 | return receiver;
|
890 | }
|
891 | parseCall(receiver, start, isSafe) {
|
892 | const argumentStart = this.inputIndex;
|
893 | this.rparensExpected++;
|
894 | const args = this.parseCallArguments();
|
895 | const argumentSpan = this.span(argumentStart, this.inputIndex).toAbsolute(this.absoluteOffset);
|
896 | this.expectCharacter(chars.$RPAREN);
|
897 | this.rparensExpected--;
|
898 | const span = this.span(start);
|
899 | const sourceSpan = this.sourceSpan(start);
|
900 | return isSafe ? new SafeCall(span, sourceSpan, receiver, args, argumentSpan) :
|
901 | new Call(span, sourceSpan, receiver, args, argumentSpan);
|
902 | }
|
903 | consumeOptionalAssignment() {
|
904 | // When parsing assignment events (originating from two-way-binding aka banana-in-a-box syntax),
|
905 | // it is valid for the primary expression to be terminated by the non-null operator. This
|
906 | // primary expression is substituted as LHS of the assignment operator to achieve
|
907 | // two-way-binding, such that the LHS could be the non-null operator. The grammar doesn't
|
908 | // naturally allow for this syntax, so assignment events are parsed specially.
|
909 | if ((this.parseFlags & 2 /* AssignmentEvent */) && this.next.isOperator('!') &&
|
910 | this.peek(1).isOperator('=')) {
|
911 | // First skip over the ! operator.
|
912 | this.advance();
|
913 | // Then skip over the = operator, to fully consume the optional assignment operator.
|
914 | this.advance();
|
915 | return true;
|
916 | }
|
917 | return this.consumeOptionalOperator('=');
|
918 | }
|
919 | parseCallArguments() {
|
920 | if (this.next.isCharacter(chars.$RPAREN))
|
921 | return [];
|
922 | const positionals = [];
|
923 | do {
|
924 | positionals.push(this.parsePipe());
|
925 | } while (this.consumeOptionalCharacter(chars.$COMMA));
|
926 | return positionals;
|
927 | }
|
928 | /**
|
929 | * Parses an identifier, a keyword, a string with an optional `-` in between,
|
930 | * and returns the string along with its absolute source span.
|
931 | */
|
932 | expectTemplateBindingKey() {
|
933 | let result = '';
|
934 | let operatorFound = false;
|
935 | const start = this.currentAbsoluteOffset;
|
936 | do {
|
937 | result += this.expectIdentifierOrKeywordOrString();
|
938 | operatorFound = this.consumeOptionalOperator('-');
|
939 | if (operatorFound) {
|
940 | result += '-';
|
941 | }
|
942 | } while (operatorFound);
|
943 | return {
|
944 | source: result,
|
945 | span: new AbsoluteSourceSpan(start, start + result.length),
|
946 | };
|
947 | }
|
948 | /**
|
949 | * Parse microsyntax template expression and return a list of bindings or
|
950 | * parsing errors in case the given expression is invalid.
|
951 | *
|
952 | * For example,
|
953 | * ```
|
954 | * <div *ngFor="let item of items; index as i; trackBy: func">
|
955 | * ```
|
956 | * contains five bindings:
|
957 | * 1. ngFor -> null
|
958 | * 2. item -> NgForOfContext.$implicit
|
959 | * 3. ngForOf -> items
|
960 | * 4. i -> NgForOfContext.index
|
961 | * 5. ngForTrackBy -> func
|
962 | *
|
963 | * For a full description of the microsyntax grammar, see
|
964 | * https://gist.github.com/mhevery/d3530294cff2e4a1b3fe15ff75d08855
|
965 | *
|
966 | * @param templateKey name of the microsyntax directive, like ngIf, ngFor,
|
967 | * without the *, along with its absolute span.
|
968 | */
|
969 | parseTemplateBindings(templateKey) {
|
970 | const bindings = [];
|
971 | // The first binding is for the template key itself
|
972 | // In *ngFor="let item of items", key = "ngFor", value = null
|
973 | // In *ngIf="cond | pipe", key = "ngIf", value = "cond | pipe"
|
974 | bindings.push(...this.parseDirectiveKeywordBindings(templateKey));
|
975 | while (this.index < this.tokens.length) {
|
976 | // If it starts with 'let', then this must be variable declaration
|
977 | const letBinding = this.parseLetBinding();
|
978 | if (letBinding) {
|
979 | bindings.push(letBinding);
|
980 | }
|
981 | else {
|
982 | // Two possible cases here, either `value "as" key` or
|
983 | // "directive-keyword expression". We don't know which case, but both
|
984 | // "value" and "directive-keyword" are template binding key, so consume
|
985 | // the key first.
|
986 | const key = this.expectTemplateBindingKey();
|
987 | // Peek at the next token, if it is "as" then this must be variable
|
988 | // declaration.
|
989 | const binding = this.parseAsBinding(key);
|
990 | if (binding) {
|
991 | bindings.push(binding);
|
992 | }
|
993 | else {
|
994 | // Otherwise the key must be a directive keyword, like "of". Transform
|
995 | // the key to actual key. Eg. of -> ngForOf, trackBy -> ngForTrackBy
|
996 | key.source =
|
997 | templateKey.source + key.source.charAt(0).toUpperCase() + key.source.substring(1);
|
998 | bindings.push(...this.parseDirectiveKeywordBindings(key));
|
999 | }
|
1000 | }
|
1001 | this.consumeStatementTerminator();
|
1002 | }
|
1003 | return new TemplateBindingParseResult(bindings, [] /* warnings */, this.errors);
|
1004 | }
|
1005 | parseKeyedReadOrWrite(receiver, start, isSafe) {
|
1006 | return this.withContext(ParseContextFlags.Writable, () => {
|
1007 | this.rbracketsExpected++;
|
1008 | const key = this.parsePipe();
|
1009 | if (key instanceof EmptyExpr) {
|
1010 | this.error(`Key access cannot be empty`);
|
1011 | }
|
1012 | this.rbracketsExpected--;
|
1013 | this.expectCharacter(chars.$RBRACKET);
|
1014 | if (this.consumeOptionalOperator('=')) {
|
1015 | if (isSafe) {
|
1016 | this.error('The \'?.\' operator cannot be used in the assignment');
|
1017 | }
|
1018 | else {
|
1019 | const value = this.parseConditional();
|
1020 | return new KeyedWrite(this.span(start), this.sourceSpan(start), receiver, key, value);
|
1021 | }
|
1022 | }
|
1023 | else {
|
1024 | return isSafe ? new SafeKeyedRead(this.span(start), this.sourceSpan(start), receiver, key) :
|
1025 | new KeyedRead(this.span(start), this.sourceSpan(start), receiver, key);
|
1026 | }
|
1027 | return new EmptyExpr(this.span(start), this.sourceSpan(start));
|
1028 | });
|
1029 | }
|
1030 | /**
|
1031 | * Parse a directive keyword, followed by a mandatory expression.
|
1032 | * For example, "of items", "trackBy: func".
|
1033 | * The bindings are: ngForOf -> items, ngForTrackBy -> func
|
1034 | * There could be an optional "as" binding that follows the expression.
|
1035 | * For example,
|
1036 | * ```
|
1037 | * *ngFor="let item of items | slice:0:1 as collection".
|
1038 | * ^^ ^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^
|
1039 | * keyword bound target optional 'as' binding
|
1040 | * ```
|
1041 | *
|
1042 | * @param key binding key, for example, ngFor, ngIf, ngForOf, along with its
|
1043 | * absolute span.
|
1044 | */
|
1045 | parseDirectiveKeywordBindings(key) {
|
1046 | const bindings = [];
|
1047 | this.consumeOptionalCharacter(chars.$COLON); // trackBy: trackByFunction
|
1048 | const value = this.getDirectiveBoundTarget();
|
1049 | let spanEnd = this.currentAbsoluteOffset;
|
1050 | // The binding could optionally be followed by "as". For example,
|
1051 | // *ngIf="cond | pipe as x". In this case, the key in the "as" binding
|
1052 | // is "x" and the value is the template key itself ("ngIf"). Note that the
|
1053 | // 'key' in the current context now becomes the "value" in the next binding.
|
1054 | const asBinding = this.parseAsBinding(key);
|
1055 | if (!asBinding) {
|
1056 | this.consumeStatementTerminator();
|
1057 | spanEnd = this.currentAbsoluteOffset;
|
1058 | }
|
1059 | const sourceSpan = new AbsoluteSourceSpan(key.span.start, spanEnd);
|
1060 | bindings.push(new ExpressionBinding(sourceSpan, key, value));
|
1061 | if (asBinding) {
|
1062 | bindings.push(asBinding);
|
1063 | }
|
1064 | return bindings;
|
1065 | }
|
1066 | /**
|
1067 | * Return the expression AST for the bound target of a directive keyword
|
1068 | * binding. For example,
|
1069 | * ```
|
1070 | * *ngIf="condition | pipe"
|
1071 | * ^^^^^^^^^^^^^^^^ bound target for "ngIf"
|
1072 | * *ngFor="let item of items"
|
1073 | * ^^^^^ bound target for "ngForOf"
|
1074 | * ```
|
1075 | */
|
1076 | getDirectiveBoundTarget() {
|
1077 | if (this.next === EOF || this.peekKeywordAs() || this.peekKeywordLet()) {
|
1078 | return null;
|
1079 | }
|
1080 | const ast = this.parsePipe(); // example: "condition | async"
|
1081 | const { start, end } = ast.span;
|
1082 | const value = this.input.substring(start, end);
|
1083 | return new ASTWithSource(ast, value, this.location, this.absoluteOffset + start, this.errors);
|
1084 | }
|
1085 | /**
|
1086 | * Return the binding for a variable declared using `as`. Note that the order
|
1087 | * of the key-value pair in this declaration is reversed. For example,
|
1088 | * ```
|
1089 | * *ngFor="let item of items; index as i"
|
1090 | * ^^^^^ ^
|
1091 | * value key
|
1092 | * ```
|
1093 | *
|
1094 | * @param value name of the value in the declaration, "ngIf" in the example
|
1095 | * above, along with its absolute span.
|
1096 | */
|
1097 | parseAsBinding(value) {
|
1098 | if (!this.peekKeywordAs()) {
|
1099 | return null;
|
1100 | }
|
1101 | this.advance(); // consume the 'as' keyword
|
1102 | const key = this.expectTemplateBindingKey();
|
1103 | this.consumeStatementTerminator();
|
1104 | const sourceSpan = new AbsoluteSourceSpan(value.span.start, this.currentAbsoluteOffset);
|
1105 | return new VariableBinding(sourceSpan, key, value);
|
1106 | }
|
1107 | /**
|
1108 | * Return the binding for a variable declared using `let`. For example,
|
1109 | * ```
|
1110 | * *ngFor="let item of items; let i=index;"
|
1111 | * ^^^^^^^^ ^^^^^^^^^^^
|
1112 | * ```
|
1113 | * In the first binding, `item` is bound to `NgForOfContext.$implicit`.
|
1114 | * In the second binding, `i` is bound to `NgForOfContext.index`.
|
1115 | */
|
1116 | parseLetBinding() {
|
1117 | if (!this.peekKeywordLet()) {
|
1118 | return null;
|
1119 | }
|
1120 | const spanStart = this.currentAbsoluteOffset;
|
1121 | this.advance(); // consume the 'let' keyword
|
1122 | const key = this.expectTemplateBindingKey();
|
1123 | let value = null;
|
1124 | if (this.consumeOptionalOperator('=')) {
|
1125 | value = this.expectTemplateBindingKey();
|
1126 | }
|
1127 | this.consumeStatementTerminator();
|
1128 | const sourceSpan = new AbsoluteSourceSpan(spanStart, this.currentAbsoluteOffset);
|
1129 | return new VariableBinding(sourceSpan, key, value);
|
1130 | }
|
1131 | /**
|
1132 | * Consume the optional statement terminator: semicolon or comma.
|
1133 | */
|
1134 | consumeStatementTerminator() {
|
1135 | this.consumeOptionalCharacter(chars.$SEMICOLON) || this.consumeOptionalCharacter(chars.$COMMA);
|
1136 | }
|
1137 | /**
|
1138 | * Records an error and skips over the token stream until reaching a recoverable point. See
|
1139 | * `this.skip` for more details on token skipping.
|
1140 | */
|
1141 | error(message, index = null) {
|
1142 | this.errors.push(new ParserError(message, this.input, this.locationText(index), this.location));
|
1143 | this.skip();
|
1144 | }
|
1145 | locationText(index = null) {
|
1146 | if (index == null)
|
1147 | index = this.index;
|
1148 | return (index < this.tokens.length) ? `at column ${this.tokens[index].index + 1} in` :
|
1149 | `at the end of the expression`;
|
1150 | }
|
1151 | /**
|
1152 | * Records an error for an unexpected private identifier being discovered.
|
1153 | * @param token Token representing a private identifier.
|
1154 | * @param extraMessage Optional additional message being appended to the error.
|
1155 | */
|
1156 | _reportErrorForPrivateIdentifier(token, extraMessage) {
|
1157 | let errorMessage = `Private identifiers are not supported. Unexpected private identifier: ${token}`;
|
1158 | if (extraMessage !== null) {
|
1159 | errorMessage += `, ${extraMessage}`;
|
1160 | }
|
1161 | this.error(errorMessage);
|
1162 | }
|
1163 | /**
|
1164 | * Error recovery should skip tokens until it encounters a recovery point.
|
1165 | *
|
1166 | * The following are treated as unconditional recovery points:
|
1167 | * - end of input
|
1168 | * - ';' (parseChain() is always the root production, and it expects a ';')
|
1169 | * - '|' (since pipes may be chained and each pipe expression may be treated independently)
|
1170 | *
|
1171 | * The following are conditional recovery points:
|
1172 | * - ')', '}', ']' if one of calling productions is expecting one of these symbols
|
1173 | * - This allows skip() to recover from errors such as '(a.) + 1' allowing more of the AST to
|
1174 | * be retained (it doesn't skip any tokens as the ')' is retained because of the '(' begins
|
1175 | * an '(' <expr> ')' production).
|
1176 | * The recovery points of grouping symbols must be conditional as they must be skipped if
|
1177 | * none of the calling productions are not expecting the closing token else we will never
|
1178 | * make progress in the case of an extraneous group closing symbol (such as a stray ')').
|
1179 | * That is, we skip a closing symbol if we are not in a grouping production.
|
1180 | * - '=' in a `Writable` context
|
1181 | * - In this context, we are able to recover after seeing the `=` operator, which
|
1182 | * signals the presence of an independent rvalue expression following the `=` operator.
|
1183 | *
|
1184 | * If a production expects one of these token it increments the corresponding nesting count,
|
1185 | * and then decrements it just prior to checking if the token is in the input.
|
1186 | */
|
1187 | skip() {
|
1188 | let n = this.next;
|
1189 | while (this.index < this.tokens.length && !n.isCharacter(chars.$SEMICOLON) &&
|
1190 | !n.isOperator('|') && (this.rparensExpected <= 0 || !n.isCharacter(chars.$RPAREN)) &&
|
1191 | (this.rbracesExpected <= 0 || !n.isCharacter(chars.$RBRACE)) &&
|
1192 | (this.rbracketsExpected <= 0 || !n.isCharacter(chars.$RBRACKET)) &&
|
1193 | (!(this.context & ParseContextFlags.Writable) || !n.isOperator('='))) {
|
1194 | if (this.next.isError()) {
|
1195 | this.errors.push(new ParserError(this.next.toString(), this.input, this.locationText(), this.location));
|
1196 | }
|
1197 | this.advance();
|
1198 | n = this.next;
|
1199 | }
|
1200 | }
|
1201 | }
|
1202 | class SimpleExpressionChecker extends RecursiveAstVisitor {
|
1203 | constructor() {
|
1204 | super(...arguments);
|
1205 | this.errors = [];
|
1206 | }
|
1207 | visitPipe() {
|
1208 | this.errors.push('pipes');
|
1209 | }
|
1210 | }
|
1211 | /**
|
1212 | * Computes the real offset in the original template for indexes in an interpolation.
|
1213 | *
|
1214 | * Because templates can have encoded HTML entities and the input passed to the parser at this stage
|
1215 | * of the compiler is the _decoded_ value, we need to compute the real offset using the original
|
1216 | * encoded values in the interpolated tokens. Note that this is only a special case handling for
|
1217 | * `MlParserTokenType.ENCODED_ENTITY` token types. All other interpolated tokens are expected to
|
1218 | * have parts which exactly match the input string for parsing the interpolation.
|
1219 | *
|
1220 | * @param interpolatedTokens The tokens for the interpolated value.
|
1221 | *
|
1222 | * @returns A map of index locations in the decoded template to indexes in the original template
|
1223 | */
|
1224 | function getIndexMapForOriginalTemplate(interpolatedTokens) {
|
1225 | let offsetMap = new Map();
|
1226 | let consumedInOriginalTemplate = 0;
|
1227 | let consumedInInput = 0;
|
1228 | let tokenIndex = 0;
|
1229 | while (tokenIndex < interpolatedTokens.length) {
|
1230 | const currentToken = interpolatedTokens[tokenIndex];
|
1231 | if (currentToken.type === 9 /* ENCODED_ENTITY */) {
|
1232 | const [decoded, encoded] = currentToken.parts;
|
1233 | consumedInOriginalTemplate += encoded.length;
|
1234 | consumedInInput += decoded.length;
|
1235 | }
|
1236 | else {
|
1237 | const lengthOfParts = currentToken.parts.reduce((sum, current) => sum + current.length, 0);
|
1238 | consumedInInput += lengthOfParts;
|
1239 | consumedInOriginalTemplate += lengthOfParts;
|
1240 | }
|
1241 | offsetMap.set(consumedInInput, consumedInOriginalTemplate);
|
1242 | tokenIndex++;
|
1243 | }
|
1244 | return offsetMap;
|
1245 | }
|
1246 | //# 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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport * as chars from '../chars';\nimport {DEFAULT_INTERPOLATION_CONFIG, InterpolationConfig} from '../ml_parser/interpolation_config';\nimport {InterpolatedAttributeToken, InterpolatedTextToken, TokenType as MlParserTokenType} from '../ml_parser/tokens';\n\nimport {AbsoluteSourceSpan, AST, ASTWithSource, Binary, BindingPipe, Call, Chain, Conditional, EmptyExpr, ExpressionBinding, ImplicitReceiver, Interpolation, KeyedRead, KeyedWrite, LiteralArray, LiteralMap, LiteralMapKey, LiteralPrimitive, NonNullAssert, ParserError, ParseSpan, PrefixNot, PropertyRead, PropertyWrite, Quote, RecursiveAstVisitor, SafeCall, SafeKeyedRead, SafePropertyRead, TemplateBinding, TemplateBindingIdentifier, ThisReceiver, Unary, VariableBinding} from './ast';\nimport {EOF, isIdentifier, Lexer, Token, TokenType} from './lexer';\n\nexport interface InterpolationPiece {\n  text: string;\n  start: number;\n  end: number;\n}\nexport class SplitInterpolation {\n  constructor(\n      public strings: InterpolationPiece[], public expressions: InterpolationPiece[],\n      public offsets: number[]) {}\n}\n\nexport class TemplateBindingParseResult {\n  constructor(\n      public templateBindings: TemplateBinding[], public warnings: string[],\n      public errors: ParserError[]) {}\n}\n\n/**\n * Represents the possible parse modes to be used as a bitmask.\n */\nexport const enum ParseFlags {\n  None = 0,\n\n  /**\n   * Whether an output binding is being parsed.\n   */\n  Action = 1 << 0,\n\n  /**\n   * Whether an assignment event is being parsed, i.e. an expression originating from\n   * two-way-binding aka banana-in-a-box syntax.\n   */\n  AssignmentEvent = 1 << 1,\n}\n\nexport class Parser {\n  private errors: ParserError[] = [];\n\n  constructor(private _lexer: Lexer) {}\n\n  parseAction(\n      input: string, isAssignmentEvent: boolean, location: string, absoluteOffset: number,\n      interpolationConfig: InterpolationConfig = DEFAULT_INTERPOLATION_CONFIG): ASTWithSource {\n    this._checkNoInterpolation(input, location, interpolationConfig);\n    const sourceToLex = this._stripComments(input);\n    const tokens = this._lexer.tokenize(sourceToLex);\n    let flags = ParseFlags.Action;\n    if (isAssignmentEvent) {\n      flags |= ParseFlags.AssignmentEvent;\n    }\n    const ast =\n        new _ParseAST(input, location, absoluteOffset, tokens, flags, this.errors, 0).parseChain();\n    return new ASTWithSource(ast, input, location, absoluteOffset, this.errors);\n  }\n\n  parseBinding(\n      input: string, location: string, absoluteOffset: number,\n      interpolationConfig: InterpolationConfig = DEFAULT_INTERPOLATION_CONFIG): ASTWithSource {\n    const ast = this._parseBindingAst(input, location, absoluteOffset, interpolationConfig);\n    return new ASTWithSource(ast, input, location, absoluteOffset, this.errors);\n  }\n\n  private checkSimpleExpression(ast: AST): string[] {\n    const checker = new SimpleExpressionChecker();\n    ast.visit(checker);\n    return checker.errors;\n  }\n\n  parseSimpleBinding(\n      input: string, location: string, absoluteOffset: number,\n      interpolationConfig: InterpolationConfig = DEFAULT_INTERPOLATION_CONFIG): ASTWithSource {\n    const ast = this._parseBindingAst(input, location, absoluteOffset, interpolationConfig);\n    const errors = this.checkSimpleExpression(ast);\n    if (errors.length > 0) {\n      this._reportError(\n          `Host binding expression cannot contain ${errors.join(' ')}`, input, location);\n    }\n    return new ASTWithSource(ast, input, location, absoluteOffset, this.errors);\n  }\n\n  private _reportError(message: string, input: string, errLocation: string, ctxLocation?: string) {\n    this.errors.push(new ParserError(message, input, errLocation, ctxLocation));\n  }\n\n  private _parseBindingAst(\n      input: string, location: string, absoluteOffset: number,\n      interpolationConfig: InterpolationConfig): AST {\n    // Quotes expressions use 3rd-party expression language. We don't want to use\n    // our lexer or parser for that, so we check for that ahead of time.\n    const quote = this._parseQuote(input, location, absoluteOffset);\n\n    if (quote != null) {\n      return quote;\n    }\n\n    this._checkNoInterpolation(input, location, interpolationConfig);\n    const sourceToLex = this._stripComments(input);\n    const tokens = this._lexer.tokenize(sourceToLex);\n    return new _ParseAST(input, location, absoluteOffset, tokens, ParseFlags.None, this.errors, 0)\n        .parseChain();\n  }\n\n  private _parseQuote(input: string|null, location: string, absoluteOffset: number): AST|null {\n    if (input == null) return null;\n    const prefixSeparatorIndex = input.indexOf(':');\n    if (prefixSeparatorIndex == -1) return null;\n    const prefix = input.substring(0, prefixSeparatorIndex).trim();\n    if (!isIdentifier(prefix)) return null;\n    const uninterpretedExpression = input.substring(prefixSeparatorIndex + 1);\n    const span = new ParseSpan(0, input.length);\n    return new Quote(\n        span, span.toAbsolute(absoluteOffset), prefix, uninterpretedExpression, location);\n  }\n\n  /**\n   * Parse microsyntax template expression and return a list of bindings or\n   * parsing errors in case the given expression is invalid.\n   *\n   * For example,\n   * ```\n   *   <div *ngFor=\"let item of items\">\n   *         ^      ^ absoluteValueOffset for `templateValue`\n   *         absoluteKeyOffset for `templateKey`\n   * ```\n   * contains three bindings:\n   * 1. ngFor -> null\n   * 2. item -> NgForOfContext.$implicit\n   * 3. ngForOf -> items\n   *\n   * This is apparent from the de-sugared template:\n   * ```\n   *   <ng-template ngFor let-item [ngForOf]=\"items\">\n   * ```\n   *\n   * @param templateKey name of directive, without the * prefix. For example: ngIf, ngFor\n   * @param templateValue RHS of the microsyntax attribute\n   * @param templateUrl template filename if it's external, component filename if it's inline\n   * @param absoluteKeyOffset start of the `templateKey`\n   * @param absoluteValueOffset start of the `templateValue`\n   */\n  parseTemplateBindings(\n      templateKey: string, templateValue: string, templateUrl: string, absoluteKeyOffset: number,\n      absoluteValueOffset: number): TemplateBindingParseResult {\n    const tokens = this._lexer.tokenize(templateValue);\n    const parser = new _ParseAST(\n        templateValue, templateUrl, absoluteValueOffset, tokens, ParseFlags.None, this.errors,\n        0 /* relative offset */);\n    return parser.parseTemplateBindings({\n      source: templateKey,\n      span: new AbsoluteSourceSpan(absoluteKeyOffset, absoluteKeyOffset + templateKey.length),\n    });\n  }\n\n  parseInterpolation(\n      input: string, location: string, absoluteOffset: number,\n      interpolatedTokens: InterpolatedAttributeToken[]|InterpolatedTextToken[]|null,\n      interpolationConfig: InterpolationConfig = DEFAULT_INTERPOLATION_CONFIG): ASTWithSource|null {\n    const {strings, expressions, offsets} =\n        this.splitInterpolation(input, location, interpolatedTokens, interpolationConfig);\n    if (expressions.length === 0) return null;\n\n    const expressionNodes: AST[] = [];\n\n    for (let i = 0; i < expressions.length; ++i) {\n      const expressionText = expressions[i].text;\n      const sourceToLex = this._stripComments(expressionText);\n      const tokens = this._lexer.tokenize(sourceToLex);\n      const ast =\n          new _ParseAST(\n              input, location, absoluteOffset, tokens, ParseFlags.None, this.errors, offsets[i])\n              .parseChain();\n      expressionNodes.push(ast);\n    }\n\n    return this.createInterpolationAst(\n        strings.map(s => s.text), expressionNodes, input, location, absoluteOffset);\n  }\n\n  /**\n   * Similar to `parseInterpolation`, but treats the provided string as a single expression\n   * element that would normally appear within the interpolation prefix and suffix (`{{` and `}}`).\n   * This is used for parsing the switch expression in ICUs.\n   */\n  parseInterpolationExpression(expression: string, location: string, absoluteOffset: number):\n      ASTWithSource {\n    const sourceToLex = this._stripComments(expression);\n    const tokens = this._lexer.tokenize(sourceToLex);\n    const ast =\n        new _ParseAST(expression, location, absoluteOffset, tokens, ParseFlags.None, this.errors, 0)\n            .parseChain();\n    const strings = ['', ''];  // The prefix and suffix strings are both empty\n    return this.createInterpolationAst(strings, [ast], expression, location, absoluteOffset);\n  }\n\n  private createInterpolationAst(\n      strings: string[], expressions: AST[], input: string, location: string,\n      absoluteOffset: number): ASTWithSource {\n    const span = new ParseSpan(0, input.length);\n    const interpolation =\n        new Interpolation(span, span.toAbsolute(absoluteOffset), strings, expressions);\n    return new ASTWithSource(interpolation, input, location, absoluteOffset, this.errors);\n  }\n\n  /**\n   * Splits a string of text into \"raw\" text segments and expressions present in interpolations in\n   * the string.\n   * Returns `null` if there are no interpolations, otherwise a\n   * `SplitInterpolation` with splits that look like\n   *   <raw text> <expression> <raw text> ... <raw text> <expression> <raw text>\n   */\n  splitInterpolation(\n      input: string, location: string,\n      interpolatedTokens: InterpolatedAttributeToken[]|InterpolatedTextToken[]|null,\n      interpolationConfig: InterpolationConfig = DEFAULT_INTERPOLATION_CONFIG): SplitInterpolation {\n    const strings: InterpolationPiece[] = [];\n    const expressions: InterpolationPiece[] = [];\n    const offsets: number[] = [];\n    const inputToTemplateIndexMap =\n        interpolatedTokens ? getIndexMapForOriginalTemplate(interpolatedTokens) : null;\n    let i = 0;\n    let atInterpolation = false;\n    let extendLastString = false;\n    let {start: interpStart, end: interpEnd} = interpolationConfig;\n    while (i < input.length) {\n      if (!atInterpolation) {\n        // parse until starting {{\n        const start = i;\n        i = input.indexOf(interpStart, i);\n        if (i === -1) {\n          i = input.length;\n        }\n        const text = input.substring(start, i);\n        strings.push({text, start, end: i});\n\n        atInterpolation = true;\n      } else {\n        // parse from starting {{ to ending }} while ignoring content inside quotes.\n        const fullStart = i;\n        const exprStart = fullStart + interpStart.length;\n        const exprEnd = this._getInterpolationEndIndex(input, interpEnd, exprStart);\n        if (exprEnd === -1) {\n          // Could not find the end of the interpolation; do not parse an expression.\n          // Instead we should extend the content on the last raw string.\n          atInterpolation = false;\n          extendLastString = true;\n          break;\n        }\n        const fullEnd = exprEnd + interpEnd.length;\n\n        const text = input.substring(exprStart, exprEnd);\n        if (text.trim().length === 0) {\n          this._reportError(\n              'Blank expressions are not allowed in interpolated strings', input,\n              `at column ${i} in`, location);\n        }\n        expressions.push({text, start: fullStart, end: fullEnd});\n        const startInOriginalTemplate = inputToTemplateIndexMap?.get(fullStart) ?? fullStart;\n        const offset = startInOriginalTemplate + interpStart.length;\n        offsets.push(offset);\n\n        i = fullEnd;\n        atInterpolation = false;\n      }\n    }\n    if (!atInterpolation) {\n      // If we are now at a text section, add the remaining content as a raw string.\n      if (extendLastString) {\n        const piece = strings[strings.length - 1];\n        piece.text += input.substring(i);\n        piece.end = input.length;\n      } else {\n        strings.push({text: input.substring(i), start: i, end: input.length});\n      }\n    }\n    return new SplitInterpolation(strings, expressions, offsets);\n  }\n\n  wrapLiteralPrimitive(input: string|null, location: string, absoluteOffset: number):\n      ASTWithSource {\n    const span = new ParseSpan(0, input == null ? 0 : input.length);\n    return new ASTWithSource(\n        new LiteralPrimitive(span, span.toAbsolute(absoluteOffset), input), input, location,\n        absoluteOffset, this.errors);\n  }\n\n  private _stripComments(input: string): string {\n    const i = this._commentStart(input);\n    return i != null ? input.substring(0, i) : input;\n  }\n\n  private _commentStart(input: string): number|null {\n    let outerQuote: number|null = null;\n    for (let i = 0; i < input.length - 1; i++) {\n      const char = input.charCodeAt(i);\n      const nextChar = input.charCodeAt(i + 1);\n\n      if (char === chars.$SLASH && nextChar == chars.$SLASH && outerQuote == null) return i;\n\n      if (outerQuote === char) {\n        outerQuote = null;\n      } else if (outerQuote == null && chars.isQuote(char)) {\n        outerQuote = char;\n      }\n    }\n    return null;\n  }\n\n  private _checkNoInterpolation(input: string, location: string, {start, end}: InterpolationConfig):\n      void {\n    let startIndex = -1;\n    let endIndex = -1;\n\n    for (const charIndex of this._forEachUnquotedChar(input, 0)) {\n      if (startIndex === -1) {\n        if (input.startsWith(start)) {\n          startIndex = charIndex;\n        }\n      } else {\n        endIndex = this._getInterpolationEndIndex(input, end, charIndex);\n        if (endIndex > -1) {\n          break;\n        }\n      }\n    }\n\n    if (startIndex > -1 && endIndex > -1) {\n      this._reportError(\n          `Got interpolation (${start}${end}) where expression was expected`, input,\n          `at column ${startIndex} in`, location);\n    }\n  }\n\n  /**\n   * Finds the index of the end of an interpolation expression\n   * while ignoring comments and quoted content.\n   */\n  private _getInterpolationEndIndex(input: string, expressionEnd: string, start: number): number {\n    for (const charIndex of this._forEachUnquotedChar(input, start)) {\n      if (input.startsWith(expressionEnd, charIndex)) {\n        return charIndex;\n      }\n\n      // Nothing else in the expression matters after we've\n      // hit a comment so look directly for the end token.\n      if (input.startsWith('//', charIndex)) {\n        return input.indexOf(expressionEnd, charIndex);\n      }\n    }\n\n    return -1;\n  }\n\n  /**\n   * Generator used to iterate over the character indexes of a string that are outside of quotes.\n   * @param input String to loop through.\n   * @param start Index within the string at which to start.\n   */\n  private * _forEachUnquotedChar(input: string, start: number) {\n    let currentQuote: string|null = null;\n    let escapeCount = 0;\n    for (let i = start; i < input.length; i++) {\n      const char = input[i];\n      // Skip the characters inside quotes. Note that we only care about the outer-most\n      // quotes matching up and we need to account for escape characters.\n      if (chars.isQuote(input.charCodeAt(i)) && (currentQuote === null || currentQuote === char) &&\n          escapeCount % 2 === 0) {\n        currentQuote = currentQuote === null ? char : null;\n      } else if (currentQuote === null) {\n        yield i;\n      }\n      escapeCount = char === '\\\\' ? escapeCount + 1 : 0;\n    }\n  }\n}\n\n/** Describes a stateful context an expression parser is in. */\nenum ParseContextFlags {\n  None = 0,\n  /**\n   * A Writable context is one in which a value may be written to an lvalue.\n   * For example, after we see a property access, we may expect a write to the\n   * property via the \"=\" operator.\n   *   prop\n   *        ^ possible \"=\" after\n   */\n  Writable = 1,\n}\n\nexport class _ParseAST {\n  private rparensExpected = 0;\n  private rbracketsExpected = 0;\n  private rbracesExpected = 0;\n  private context = ParseContextFlags.None;\n\n  // Cache of expression start and input indeces to the absolute source span they map to, used to\n  // prevent creating superfluous source spans in `sourceSpan`.\n  // A serial of the expression start and input index is used for mapping because both are stateful\n  // and may change for subsequent expressions visited by the parser.\n  private sourceSpanCache = new Map<string, AbsoluteSourceSpan>();\n\n  index: number = 0;\n\n  constructor(\n      public input: string, public location: string, public absoluteOffset: number,\n      public tokens: Token[], public parseFlags: ParseFlags, private errors: ParserError[],\n      private offset: number) {}\n\n  peek(offset: number): Token {\n    const i = this.index + offset;\n    return i < this.tokens.length ? this.tokens[i] : EOF;\n  }\n\n  get next(): Token {\n    return this.peek(0);\n  }\n\n  /** Whether all the parser input has been processed. */\n  get atEOF(): boolean {\n    return this.index >= this.tokens.length;\n  }\n\n  /**\n   * Index of the next token to be processed, or the end of the last token if all have been\n   * processed.\n   */\n  get inputIndex(): number {\n    return this.atEOF ? this.currentEndIndex : this.next.index + this.offset;\n  }\n\n  /**\n   * End index of the last processed token, or the start of the first token if none have been\n   * processed.\n   */\n  get currentEndIndex(): number {\n    if (this.index > 0) {\n      const curToken = this.peek(-1);\n      return curToken.end + this.offset;\n    }\n    // No tokens have been processed yet; return the next token's start or the length of the input\n    // if there is no token.\n    if (this.tokens.length === 0) {\n      return this.input.length + this.offset;\n    }\n    return this.next.index + this.offset;\n  }\n\n  /**\n   * Returns the absolute offset of the start of the current token.\n   */\n  get currentAbsoluteOffset(): number {\n    return this.absoluteOffset + this.inputIndex;\n  }\n\n  /**\n   * Retrieve a `ParseSpan` from `start` to the current position (or to `artificialEndIndex` if\n   * provided).\n   *\n   * @param start Position from which the `ParseSpan` will start.\n   * @param artificialEndIndex Optional ending index to be used if provided (and if greater than the\n   *     natural ending index)\n   */\n  span(start: number, artificialEndIndex?: number): ParseSpan {\n    let endIndex = this.currentEndIndex;\n    if (artificialEndIndex !== undefined && artificialEndIndex > this.currentEndIndex) {\n      endIndex = artificialEndIndex;\n    }\n\n    // In some unusual parsing scenarios (like when certain tokens are missing and an `EmptyExpr` is\n    // being created), the current token may already be advanced beyond the `currentEndIndex`. This\n    // appears to be a deep-seated parser bug.\n    //\n    // As a workaround for now, swap the start and end indices to ensure a valid `ParseSpan`.\n    // TODO(alxhub): fix the bug upstream in the parser state, and remove this workaround.\n    if (start > endIndex) {\n      const tmp = endIndex;\n      endIndex = start;\n      start = tmp;\n    }\n\n    return new ParseSpan(start, endIndex);\n  }\n\n  sourceSpan(start: number, artificialEndIndex?: number): AbsoluteSourceSpan {\n    const serial = `${start}@${this.inputIndex}:${artificialEndIndex}`;\n    if (!this.sourceSpanCache.has(serial)) {\n      this.sourceSpanCache.set(\n          serial, this.span(start, artificialEndIndex).toAbsolute(this.absoluteOffset));\n    }\n    return this.sourceSpanCache.get(serial)!;\n  }\n\n  advance() {\n    this.index++;\n  }\n\n  /**\n   * Executes a callback in the provided context.\n   */\n  private withContext<T>(context: ParseContextFlags, cb: () => T): T {\n    this.context |= context;\n    const ret = cb();\n    this.context ^= context;\n    return ret;\n  }\n\n  consumeOptionalCharacter(code: number): boolean {\n    if (this.next.isCharacter(code)) {\n      this.advance();\n      return true;\n    } else {\n      return false;\n    }\n  }\n\n  peekKeywordLet(): boolean {\n    return this.next.isKeywordLet();\n  }\n  peekKeywordAs(): boolean {\n    return this.next.isKeywordAs();\n  }\n\n  /**\n   * Consumes an expected character, otherwise emits an error about the missing expected character\n   * and skips over the token stream until reaching a recoverable point.\n   *\n   * See `this.error` and `this.skip` for more details.\n   */\n  expectCharacter(code: number) {\n    if (this.consumeOptionalCharacter(code)) return;\n    this.error(`Missing expected ${String.fromCharCode(code)}`);\n  }\n\n  consumeOptionalOperator(op: string): boolean {\n    if (this.next.isOperator(op)) {\n      this.advance();\n      return true;\n    } else {\n      return false;\n    }\n  }\n\n  expectOperator(operator: string) {\n    if (this.consumeOptionalOperator(operator)) return;\n    this.error(`Missing expected operator ${operator}`);\n  }\n\n  prettyPrintToken(tok: Token): string {\n    return tok === EOF ? 'end of input' : `token ${tok}`;\n  }\n\n  expectIdentifierOrKeyword(): string|null {\n    const n = this.next;\n    if (!n.isIdentifier() && !n.isKeyword()) {\n      if (n.isPrivateIdentifier()) {\n        this._reportErrorForPrivateIdentifier(n, 'expected identifier or keyword');\n      } else {\n        this.error(`Unexpected ${this.prettyPrintToken(n)}, expected identifier or keyword`);\n      }\n      return null;\n    }\n    this.advance();\n    return n.toString() as string;\n  }\n\n  expectIdentifierOrKeywordOrString(): string {\n    const n = this.next;\n    if (!n.isIdentifier() && !n.isKeyword() && !n.isString()) {\n      if (n.isPrivateIdentifier()) {\n        this._reportErrorForPrivateIdentifier(n, 'expected identifier, keyword or string');\n      } else {\n        this.error(\n            `Unexpected ${this.prettyPrintToken(n)}, expected identifier, keyword, or string`);\n      }\n      return '';\n    }\n    this.advance();\n    return n.toString() as string;\n  }\n\n  parseChain(): AST {\n    const exprs: AST[] = [];\n    const start = this.inputIndex;\n    while (this.index < this.tokens.length) {\n      const expr = this.parsePipe();\n      exprs.push(expr);\n\n      if (this.consumeOptionalCharacter(chars.$SEMICOLON)) {\n        if (!(this.parseFlags & ParseFlags.Action)) {\n          this.error('Binding expression cannot contain chained expression');\n        }\n        while (this.consumeOptionalCharacter(chars.$SEMICOLON)) {\n        }  // read all semicolons\n      } else if (this.index < this.tokens.length) {\n        this.error(`Unexpected token '${this.next}'`);\n      }\n    }\n    if (exprs.length == 0) {\n      // We have no expressions so create an empty expression that spans the entire input length\n      const artificialStart = this.offset;\n      const artificialEnd = this.offset + this.input.length;\n      return new EmptyExpr(\n          this.span(artificialStart, artificialEnd),\n          this.sourceSpan(artificialStart, artificialEnd));\n    }\n    if (exprs.length == 1) return exprs[0];\n    return new Chain(this.span(start), this.sourceSpan(start), exprs);\n  }\n\n  parsePipe(): AST {\n    const start = this.inputIndex;\n    let result = this.parseExpression();\n    if (this.consumeOptionalOperator('|')) {\n      if (this.parseFlags & ParseFlags.Action) {\n        this.error('Cannot have a pipe in an action expression');\n      }\n\n      do {\n        const nameStart = this.inputIndex;\n        let nameId = this.expectIdentifierOrKeyword();\n        let nameSpan: AbsoluteSourceSpan;\n        let fullSpanEnd: number|undefined = undefined;\n        if (nameId !== null) {\n          nameSpan = this.sourceSpan(nameStart);\n        } else {\n          // No valid identifier was found, so we'll assume an empty pipe name ('').\n          nameId = '';\n\n          // However, there may have been whitespace present between the pipe character and the next\n          // token in the sequence (or the end of input). We want to track this whitespace so that\n          // the `BindingPipe` we produce covers not just the pipe character, but any trailing\n          // whitespace beyond it. Another way of thinking about this is that the zero-length name\n          // is assumed to be at the end of any whitespace beyond the pipe character.\n          //\n          // Therefore, we push the end of the `ParseSpan` for this pipe all the way up to the\n          // beginning of the next token, or until the end of input if the next token is EOF.\n          fullSpanEnd = this.next.index !== -1 ? this.next.index : this.input.length + this.offset;\n\n          // The `nameSpan` for an empty pipe name is zero-length at the end of any whitespace\n          // beyond the pipe character.\n          nameSpan = new ParseSpan(fullSpanEnd, fullSpanEnd).toAbsolute(this.absoluteOffset);\n        }\n\n        const args: AST[] = [];\n        while (this.consumeOptionalCharacter(chars.$COLON)) {\n          args.push(this.parseExpression());\n\n          // If there are additional expressions beyond the name, then the artificial end for the\n          // name is no longer relevant.\n        }\n        result = new BindingPipe(\n            this.span(start), this.sourceSpan(start, fullSpanEnd), result, nameId, args, nameSpan);\n      } while (this.consumeOptionalOperator('|'));\n    }\n\n    return result;\n  }\n\n  parseExpression(): AST {\n    return this.parseConditional();\n  }\n\n  parseConditional(): AST {\n    const start = this.inputIndex;\n    const result = this.parseLogicalOr();\n\n    if (this.consumeOptionalOperator('?')) {\n      const yes = this.parsePipe();\n      let no: AST;\n      if (!this.consumeOptionalCharacter(chars.$COLON)) {\n        const end = this.inputIndex;\n        const expression = this.input.substring(start, end);\n        this.error(`Conditional expression ${expression} requires all 3 expressions`);\n        no = new EmptyExpr(this.span(start), this.sourceSpan(start));\n      } else {\n        no = this.parsePipe();\n      }\n      return new Conditional(this.span(start), this.sourceSpan(start), result, yes, no);\n    } else {\n      return result;\n    }\n  }\n\n  parseLogicalOr(): AST {\n    // '||'\n    const start = this.inputIndex;\n    let result = this.parseLogicalAnd();\n    while (this.consumeOptionalOperator('||')) {\n      const right = this.parseLogicalAnd();\n      result = new Binary(this.span(start), this.sourceSpan(start), '||', result, right);\n    }\n    return result;\n  }\n\n  parseLogicalAnd(): AST {\n    // '&&'\n    const start = this.inputIndex;\n    let result = this.parseNullishCoalescing();\n    while (this.consumeOptionalOperator('&&')) {\n      const right = this.parseNullishCoalescing();\n      result = new Binary(this.span(start), this.sourceSpan(start), '&&', result, right);\n    }\n    return result;\n  }\n\n  parseNullishCoalescing(): AST {\n    // '??'\n    const start = this.inputIndex;\n    let result = this.parseEquality();\n    while (this.consumeOptionalOperator('??')) {\n      const right = this.parseEquality();\n      result = new Binary(this.span(start), this.sourceSpan(start), '??', result, right);\n    }\n    return result;\n  }\n\n  parseEquality(): AST {\n    // '==','!=','===','!=='\n    const start = this.inputIndex;\n    let result = this.parseRelational();\n    while (this.next.type == TokenType.Operator) {\n      const operator = this.next.strValue;\n      switch (operator) {\n        case '==':\n        case '===':\n        case '!=':\n        case '!==':\n          this.advance();\n          const right = this.parseRelational();\n          result = new Binary(this.span(start), this.sourceSpan(start), operator, result, right);\n          continue;\n      }\n      break;\n    }\n    return result;\n  }\n\n  parseRelational(): AST {\n    // '<', '>', '<=', '>='\n    const start = this.inputIndex;\n    let result = this.parseAdditive();\n    while (this.next.type == TokenType.Operator) {\n      const operator = this.next.strValue;\n      switch (operator) {\n        case '<':\n        case '>':\n        case '<=':\n        case '>=':\n          this.advance();\n          const right = this.parseAdditive();\n          result = new Binary(this.span(start), this.sourceSpan(start), operator, result, right);\n          continue;\n      }\n      break;\n    }\n    return result;\n  }\n\n  parseAdditive(): AST {\n    // '+', '-'\n    const start = this.inputIndex;\n    let result = this.parseMultiplicative();\n    while (this.next.type == TokenType.Operator) {\n      const operator = this.next.strValue;\n      switch (operator) {\n        case '+':\n        case '-':\n          this.advance();\n          let right = this.parseMultiplicative();\n          result = new Binary(this.span(start), this.sourceSpan(start), operator, result, right);\n          continue;\n      }\n      break;\n    }\n    return result;\n  }\n\n  parseMultiplicative(): AST {\n    // '*', '%', '/'\n    const start = this.inputIndex;\n    let result = this.parsePrefix();\n    while (this.next.type == TokenType.Operator) {\n      const operator = this.next.strValue;\n      switch (operator) {\n        case '*':\n        case '%':\n        case '/':\n          this.advance();\n          let right = this.parsePrefix();\n          result = new Binary(this.span(start), this.sourceSpan(start), operator, result, right);\n          continue;\n      }\n      break;\n    }\n    return result;\n  }\n\n  parsePrefix(): AST {\n    if (this.next.type == TokenType.Operator) {\n      const start = this.inputIndex;\n      const operator = this.next.strValue;\n      let result: AST;\n      switch (operator) {\n        case '+':\n          this.advance();\n          result = this.parsePrefix();\n          return Unary.createPlus(this.span(start), this.sourceSpan(start), result);\n        case '-':\n          this.advance();\n          result = this.parsePrefix();\n          return Unary.createMinus(this.span(start), this.sourceSpan(start), result);\n        case '!':\n          this.advance();\n          result = this.parsePrefix();\n          return new PrefixNot(this.span(start), this.sourceSpan(start), result);\n      }\n    }\n    return this.parseCallChain();\n  }\n\n  parseCallChain(): AST {\n    const start = this.inputIndex;\n    let result = this.parsePrimary();\n    while (true) {\n      if (this.consumeOptionalCharacter(chars.$PERIOD)) {\n        result = this.parseAccessMember(result, start, false);\n      } else if (this.consumeOptionalOperator('?.')) {\n        if (this.consumeOptionalCharacter(chars.$LPAREN)) {\n          result = this.parseCall(result, start, true);\n        } else {\n          result = this.consumeOptionalCharacter(chars.$LBRACKET) ?\n              this.parseKeyedReadOrWrite(result, start, true) :\n              this.parseAccessMember(result, start, true);\n        }\n      } else if (this.consumeOptionalCharacter(chars.$LBRACKET)) {\n        result = this.parseKeyedReadOrWrite(result, start, false);\n      } else if (this.consumeOptionalCharacter(chars.$LPAREN)) {\n        result = this.parseCall(result, start, false);\n      } else if (this.consumeOptionalOperator('!')) {\n        result = new NonNullAssert(this.span(start), this.sourceSpan(start), result);\n\n      } else {\n        return result;\n      }\n    }\n  }\n\n  parsePrimary(): AST {\n    const start = this.inputIndex;\n    if (this.consumeOptionalCharacter(chars.$LPAREN)) {\n      this.rparensExpected++;\n      const result = this.parsePipe();\n      this.rparensExpected--;\n      this.expectCharacter(chars.$RPAREN);\n      return result;\n\n    } else if (this.next.isKeywordNull()) {\n      this.advance();\n      return new LiteralPrimitive(this.span(start), this.sourceSpan(start), null);\n\n    } else if (this.next.isKeywordUndefined()) {\n      this.advance();\n      return new LiteralPrimitive(this.span(start), this.sourceSpan(start), void 0);\n\n    } else if (this.next.isKeywordTrue()) {\n      this.advance();\n      return new LiteralPrimitive(this.span(start), this.sourceSpan(start), true);\n\n    } else if (this.next.isKeywordFalse()) {\n      this.advance();\n      return new LiteralPrimitive(this.span(start), this.sourceSpan(start), false);\n\n    } else if (this.next.isKeywordThis()) {\n      this.advance();\n      return new ThisReceiver(this.span(start), this.sourceSpan(start));\n    } else if (this.consumeOptionalCharacter(chars.$LBRACKET)) {\n      this.rbracketsExpected++;\n      const elements = this.parseExpressionList(chars.$RBRACKET);\n      this.rbracketsExpected--;\n      this.expectCharacter(chars.$RBRACKET);\n      return new LiteralArray(this.span(start), this.sourceSpan(start), elements);\n\n    } else if (this.next.isCharacter(chars.$LBRACE)) {\n      return this.parseLiteralMap();\n\n    } else if (this.next.isIdentifier()) {\n      return this.parseAccessMember(\n          new ImplicitReceiver(this.span(start), this.sourceSpan(start)), start, false);\n    } else if (this.next.isNumber()) {\n      const value = this.next.toNumber();\n      this.advance();\n      return new LiteralPrimitive(this.span(start), this.sourceSpan(start), value);\n\n    } else if (this.next.isString()) {\n      const literalValue = this.next.toString();\n      this.advance();\n      return new LiteralPrimitive(this.span(start), this.sourceSpan(start), literalValue);\n\n    } else if (this.next.isPrivateIdentifier()) {\n      this._reportErrorForPrivateIdentifier(this.next, null);\n      return new EmptyExpr(this.span(start), this.sourceSpan(start));\n\n    } else if (this.index >= this.tokens.length) {\n      this.error(`Unexpected end of expression: ${this.input}`);\n      return new EmptyExpr(this.span(start), this.sourceSpan(start));\n    } else {\n      this.error(`Unexpected token ${this.next}`);\n      return new EmptyExpr(this.span(start), this.sourceSpan(start));\n    }\n  }\n\n  parseExpressionList(terminator: number): AST[] {\n    const result: AST[] = [];\n\n    do {\n      if (!this.next.isCharacter(terminator)) {\n        result.push(this.parsePipe());\n      } else {\n        break;\n      }\n    } while (this.consumeOptionalCharacter(chars.$COMMA));\n    return result;\n  }\n\n  parseLiteralMap(): LiteralMap {\n    const keys: LiteralMapKey[] = [];\n    const values: AST[] = [];\n    const start = this.inputIndex;\n    this.expectCharacter(chars.$LBRACE);\n    if (!this.consumeOptionalCharacter(chars.$RBRACE)) {\n      this.rbracesExpected++;\n      do {\n        const keyStart = this.inputIndex;\n        const quoted = this.next.isString();\n        const key = this.expectIdentifierOrKeywordOrString();\n        keys.push({key, quoted});\n\n        // Properties with quoted keys can't use the shorthand syntax.\n        if (quoted) {\n          this.expectCharacter(chars.$COLON);\n          values.push(this.parsePipe());\n        } else if (this.consumeOptionalCharacter(chars.$COLON)) {\n          values.push(this.parsePipe());\n        } else {\n          const span = this.span(keyStart);\n          const sourceSpan = this.sourceSpan(keyStart);\n          values.push(new PropertyRead(\n              span, sourceSpan, sourceSpan, new ImplicitReceiver(span, sourceSpan), key));\n        }\n      } while (this.consumeOptionalCharacter(chars.$COMMA));\n      this.rbracesExpected--;\n      this.expectCharacter(chars.$RBRACE);\n    }\n    return new LiteralMap(this.span(start), this.sourceSpan(start), keys, values);\n  }\n\n  parseAccessMember(readReceiver: AST, start: number, isSafe: boolean): AST {\n    const nameStart = this.inputIndex;\n    const id = this.withContext(ParseContextFlags.Writable, () => {\n      const id = this.expectIdentifierOrKeyword() ?? '';\n      if (id.length === 0) {\n        this.error(`Expected identifier for property access`, readReceiver.span.end);\n      }\n      return id;\n    });\n    const nameSpan = this.sourceSpan(nameStart);\n    let receiver: AST;\n\n    if (isSafe) {\n      if (this.consumeOptionalAssignment()) {\n        this.error('The \\'?.\\' operator cannot be used in the assignment');\n        receiver = new EmptyExpr(this.span(start), this.sourceSpan(start));\n      } else {\n        receiver = new SafePropertyRead(\n            this.span(start), this.sourceSpan(start), nameSpan, readReceiver, id);\n      }\n    } else {\n      if (this.consumeOptionalAssignment()) {\n        if (!(this.parseFlags & ParseFlags.Action)) {\n          this.error('Bindings cannot contain assignments');\n          return new EmptyExpr(this.span(start), this.sourceSpan(start));\n        }\n\n        const value = this.parseConditional();\n        receiver = new PropertyWrite(\n            this.span(start), this.sourceSpan(start), nameSpan, readReceiver, id, value);\n      } else {\n        receiver =\n            new PropertyRead(this.span(start), this.sourceSpan(start), nameSpan, readReceiver, id);\n      }\n    }\n\n    return receiver;\n  }\n\n  parseCall(receiver: AST, start: number, isSafe: boolean): AST {\n    const argumentStart = this.inputIndex;\n    this.rparensExpected++;\n    const args = this.parseCallArguments();\n    const argumentSpan = this.span(argumentStart, this.inputIndex).toAbsolute(this.absoluteOffset);\n    this.expectCharacter(chars.$RPAREN);\n    this.rparensExpected--;\n    const span = this.span(start);\n    const sourceSpan = this.sourceSpan(start);\n    return isSafe ? new SafeCall(span, sourceSpan, receiver, args, argumentSpan) :\n                    new Call(span, sourceSpan, receiver, args, argumentSpan);\n  }\n\n  private consumeOptionalAssignment(): boolean {\n    // When parsing assignment events (originating from two-way-binding aka banana-in-a-box syntax),\n    // it is valid for the primary expression to be terminated by the non-null operator. This\n    // primary expression is substituted as LHS of the assignment operator to achieve\n    // two-way-binding, such that the LHS could be the non-null operator. The grammar doesn't\n    // naturally allow for this syntax, so assignment events are parsed specially.\n    if ((this.parseFlags & ParseFlags.AssignmentEvent) && this.next.isOperator('!') &&\n        this.peek(1).isOperator('=')) {\n      // First skip over the ! operator.\n      this.advance();\n      // Then skip over the = operator, to fully consume the optional assignment operator.\n      this.advance();\n      return true;\n    }\n\n    return this.consumeOptionalOperator('=');\n  }\n\n  parseCallArguments(): BindingPipe[] {\n    if (this.next.isCharacter(chars.$RPAREN)) return [];\n    const positionals: AST[] = [];\n    do {\n      positionals.push(this.parsePipe());\n    } while (this.consumeOptionalCharacter(chars.$COMMA));\n    return positionals as BindingPipe[];\n  }\n\n  /**\n   * Parses an identifier, a keyword, a string with an optional `-` in between,\n   * and returns the string along with its absolute source span.\n   */\n  expectTemplateBindingKey(): TemplateBindingIdentifier {\n    let result = '';\n    let operatorFound = false;\n    const start = this.currentAbsoluteOffset;\n    do {\n      result += this.expectIdentifierOrKeywordOrString();\n      operatorFound = this.consumeOptionalOperator('-');\n      if (operatorFound) {\n        result += '-';\n      }\n    } while (operatorFound);\n    return {\n      source: result,\n      span: new AbsoluteSourceSpan(start, start + result.length),\n    };\n  }\n\n  /**\n   * Parse microsyntax template expression and return a list of bindings or\n   * parsing errors in case the given expression is invalid.\n   *\n   * For example,\n   * ```\n   *   <div *ngFor=\"let item of items; index as i; trackBy: func\">\n   * ```\n   * contains five bindings:\n   * 1. ngFor -> null\n   * 2. item -> NgForOfContext.$implicit\n   * 3. ngForOf -> items\n   * 4. i -> NgForOfContext.index\n   * 5. ngForTrackBy -> func\n   *\n   * For a full description of the microsyntax grammar, see\n   * https://gist.github.com/mhevery/d3530294cff2e4a1b3fe15ff75d08855\n   *\n   * @param templateKey name of the microsyntax directive, like ngIf, ngFor,\n   * without the *, along with its absolute span.\n   */\n  parseTemplateBindings(templateKey: TemplateBindingIdentifier): TemplateBindingParseResult {\n    const bindings: TemplateBinding[] = [];\n\n    // The first binding is for the template key itself\n    // In *ngFor=\"let item of items\", key = \"ngFor\", value = null\n    // In *ngIf=\"cond | pipe\", key = \"ngIf\", value = \"cond | pipe\"\n    bindings.push(...this.parseDirectiveKeywordBindings(templateKey));\n\n    while (this.index < this.tokens.length) {\n      // If it starts with 'let', then this must be variable declaration\n      const letBinding = this.parseLetBinding();\n      if (letBinding) {\n        bindings.push(letBinding);\n      } else {\n        // Two possible cases here, either `value \"as\" key` or\n        // \"directive-keyword expression\". We don't know which case, but both\n        // \"value\" and \"directive-keyword\" are template binding key, so consume\n        // the key first.\n        const key = this.expectTemplateBindingKey();\n        // Peek at the next token, if it is \"as\" then this must be variable\n        // declaration.\n        const binding = this.parseAsBinding(key);\n        if (binding) {\n          bindings.push(binding);\n        } else {\n          // Otherwise the key must be a directive keyword, like \"of\". Transform\n          // the key to actual key. Eg. of -> ngForOf, trackBy -> ngForTrackBy\n          key.source =\n              templateKey.source + key.source.charAt(0).toUpperCase() + key.source.substring(1);\n          bindings.push(...this.parseDirectiveKeywordBindings(key));\n        }\n      }\n      this.consumeStatementTerminator();\n    }\n\n    return new TemplateBindingParseResult(bindings, [] /* warnings */, this.errors);\n  }\n\n  parseKeyedReadOrWrite(receiver: AST, start: number, isSafe: boolean): AST {\n    return this.withContext(ParseContextFlags.Writable, () => {\n      this.rbracketsExpected++;\n      const key = this.parsePipe();\n      if (key instanceof EmptyExpr) {\n        this.error(`Key access cannot be empty`);\n      }\n      this.rbracketsExpected--;\n      this.expectCharacter(chars.$RBRACKET);\n      if (this.consumeOptionalOperator('=')) {\n        if (isSafe) {\n          this.error('The \\'?.\\' operator cannot be used in the assignment');\n        } else {\n          const value = this.parseConditional();\n          return new KeyedWrite(this.span(start), this.sourceSpan(start), receiver, key, value);\n        }\n      } else {\n        return isSafe ? new SafeKeyedRead(this.span(start), this.sourceSpan(start), receiver, key) :\n                        new KeyedRead(this.span(start), this.sourceSpan(start), receiver, key);\n      }\n\n      return new EmptyExpr(this.span(start), this.sourceSpan(start));\n    });\n  }\n\n  /**\n   * Parse a directive keyword, followed by a mandatory expression.\n   * For example, \"of items\", \"trackBy: func\".\n   * The bindings are: ngForOf -> items, ngForTrackBy -> func\n   * There could be an optional \"as\" binding that follows the expression.\n   * For example,\n   * ```\n   *   *ngFor=\"let item of items | slice:0:1 as collection\".\n   *                    ^^ ^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^\n   *               keyword    bound target   optional 'as' binding\n   * ```\n   *\n   * @param key binding key, for example, ngFor, ngIf, ngForOf, along with its\n   * absolute span.\n   */\n  private parseDirectiveKeywordBindings(key: TemplateBindingIdentifier): TemplateBinding[] {\n    const bindings: TemplateBinding[] = [];\n    this.consumeOptionalCharacter(chars.$COLON);  // trackBy: trackByFunction\n    const value = this.getDirectiveBoundTarget();\n    let spanEnd = this.currentAbsoluteOffset;\n    // The binding could optionally be followed by \"as\". For example,\n    // *ngIf=\"cond | pipe as x\". In this case, the key in the \"as\" binding\n    // is \"x\" and the value is the template key itself (\"ngIf\"). Note that the\n    // 'key' in the current context now becomes the \"value\" in the next binding.\n    const asBinding = this.parseAsBinding(key);\n    if (!asBinding) {\n      this.consumeStatementTerminator();\n      spanEnd = this.currentAbsoluteOffset;\n    }\n    const sourceSpan = new AbsoluteSourceSpan(key.span.start, spanEnd);\n    bindings.push(new ExpressionBinding(sourceSpan, key, value));\n    if (asBinding) {\n      bindings.push(asBinding);\n    }\n    return bindings;\n  }\n\n  /**\n   * Return the expression AST for the bound target of a directive keyword\n   * binding. For example,\n   * ```\n   *   *ngIf=\"condition | pipe\"\n   *          ^^^^^^^^^^^^^^^^ bound target for \"ngIf\"\n   *   *ngFor=\"let item of items\"\n   *                       ^^^^^ bound target for \"ngForOf\"\n   * ```\n   */\n  private getDirectiveBoundTarget(): ASTWithSource|null {\n    if (this.next === EOF || this.peekKeywordAs() || this.peekKeywordLet()) {\n      return null;\n    }\n    const ast = this.parsePipe();  // example: \"condition | async\"\n    const {start, end} = ast.span;\n    const value = this.input.substring(start, end);\n    return new ASTWithSource(ast, value, this.location, this.absoluteOffset + start, this.errors);\n  }\n\n  /**\n   * Return the binding for a variable declared using `as`. Note that the order\n   * of the key-value pair in this declaration is reversed. For example,\n   * ```\n   *   *ngFor=\"let item of items; index as i\"\n   *                              ^^^^^    ^\n   *                              value    key\n   * ```\n   *\n   * @param value name of the value in the declaration, \"ngIf\" in the example\n   * above, along with its absolute span.\n   */\n  private parseAsBinding(value: TemplateBindingIdentifier): TemplateBinding|null {\n    if (!this.peekKeywordAs()) {\n      return null;\n    }\n    this.advance();  // consume the 'as' keyword\n    const key = this.expectTemplateBindingKey();\n    this.consumeStatementTerminator();\n    const sourceSpan = new AbsoluteSourceSpan(value.span.start, this.currentAbsoluteOffset);\n    return new VariableBinding(sourceSpan, key, value);\n  }\n\n  /**\n   * Return the binding for a variable declared using `let`. For example,\n   * ```\n   *   *ngFor=\"let item of items; let i=index;\"\n   *           ^^^^^^^^           ^^^^^^^^^^^\n   * ```\n   * In the first binding, `item` is bound to `NgForOfContext.$implicit`.\n   * In the second binding, `i` is bound to `NgForOfContext.index`.\n   */\n  private parseLetBinding(): TemplateBinding|null {\n    if (!this.peekKeywordLet()) {\n      return null;\n    }\n    const spanStart = this.currentAbsoluteOffset;\n    this.advance();  // consume the 'let' keyword\n    const key = this.expectTemplateBindingKey();\n    let value: TemplateBindingIdentifier|null = null;\n    if (this.consumeOptionalOperator('=')) {\n      value = this.expectTemplateBindingKey();\n    }\n    this.consumeStatementTerminator();\n    const sourceSpan = new AbsoluteSourceSpan(spanStart, this.currentAbsoluteOffset);\n    return new VariableBinding(sourceSpan, key, value);\n  }\n\n  /**\n   * Consume the optional statement terminator: semicolon or comma.\n   */\n  private consumeStatementTerminator() {\n    this.consumeOptionalCharacter(chars.$SEMICOLON) || this.consumeOptionalCharacter(chars.$COMMA);\n  }\n\n  /**\n   * Records an error and skips over the token stream until reaching a recoverable point. See\n   * `this.skip` for more details on token skipping.\n   */\n  error(message: string, index: number|null = null) {\n    this.errors.push(new ParserError(message, this.input, this.locationText(index), this.location));\n    this.skip();\n  }\n\n  private locationText(index: number|null = null) {\n    if (index == null) index = this.index;\n    return (index < this.tokens.length) ? `at column ${this.tokens[index].index + 1} in` :\n                                          `at the end of the expression`;\n  }\n\n  /**\n   * Records an error for an unexpected private identifier being discovered.\n   * @param token Token representing a private identifier.\n   * @param extraMessage Optional additional message being appended to the error.\n   */\n  private _reportErrorForPrivateIdentifier(token: Token, extraMessage: string|null) {\n    let errorMessage =\n        `Private identifiers are not supported. Unexpected private identifier: ${token}`;\n    if (extraMessage !== null) {\n      errorMessage += `, ${extraMessage}`;\n    }\n    this.error(errorMessage);\n  }\n\n  /**\n   * Error recovery should skip tokens until it encounters a recovery point.\n   *\n   * The following are treated as unconditional recovery points:\n   *   - end of input\n   *   - ';' (parseChain() is always the root production, and it expects a ';')\n   *   - '|' (since pipes may be chained and each pipe expression may be treated independently)\n   *\n   * The following are conditional recovery points:\n   *   - ')', '}', ']' if one of calling productions is expecting one of these symbols\n   *     - This allows skip() to recover from errors such as '(a.) + 1' allowing more of the AST to\n   *       be retained (it doesn't skip any tokens as the ')' is retained because of the '(' begins\n   *       an '(' <expr> ')' production).\n   *       The recovery points of grouping symbols must be conditional as they must be skipped if\n   *       none of the calling productions are not expecting the closing token else we will never\n   *       make progress in the case of an extraneous group closing symbol (such as a stray ')').\n   *       That is, we skip a closing symbol if we are not in a grouping production.\n   *   - '=' in a `Writable` context\n   *     - In this context, we are able to recover after seeing the `=` operator, which\n   *       signals the presence of an independent rvalue expression following the `=` operator.\n   *\n   * If a production expects one of these token it increments the corresponding nesting count,\n   * and then decrements it just prior to checking if the token is in the input.\n   */\n  private skip() {\n    let n = this.next;\n    while (this.index < this.tokens.length && !n.isCharacter(chars.$SEMICOLON) &&\n           !n.isOperator('|') && (this.rparensExpected <= 0 || !n.isCharacter(chars.$RPAREN)) &&\n           (this.rbracesExpected <= 0 || !n.isCharacter(chars.$RBRACE)) &&\n           (this.rbracketsExpected <= 0 || !n.isCharacter(chars.$RBRACKET)) &&\n           (!(this.context & ParseContextFlags.Writable) || !n.isOperator('='))) {\n      if (this.next.isError()) {\n        this.errors.push(\n            new ParserError(this.next.toString()!, this.input, this.locationText(), this.location));\n      }\n      this.advance();\n      n = this.next;\n    }\n  }\n}\n\nclass SimpleExpressionChecker extends RecursiveAstVisitor {\n  errors: string[] = [];\n\n  override visitPipe() {\n    this.errors.push('pipes');\n  }\n}\n/**\n * Computes the real offset in the original template for indexes in an interpolation.\n *\n * Because templates can have encoded HTML entities and the input passed to the parser at this stage\n * of the compiler is the _decoded_ value, we need to compute the real offset using the original\n * encoded values in the interpolated tokens. Note that this is only a special case handling for\n * `MlParserTokenType.ENCODED_ENTITY` token types. All other interpolated tokens are expected to\n * have parts which exactly match the input string for parsing the interpolation.\n *\n * @param interpolatedTokens The tokens for the interpolated value.\n *\n * @returns A map of index locations in the decoded template to indexes in the original template\n */\nfunction getIndexMapForOriginalTemplate(interpolatedTokens: InterpolatedAttributeToken[]|\n                                        InterpolatedTextToken[]): Map<number, number> {\n  let offsetMap = new Map<number, number>();\n  let consumedInOriginalTemplate = 0;\n  let consumedInInput = 0;\n  let tokenIndex = 0;\n  while (tokenIndex < interpolatedTokens.length) {\n    const currentToken = interpolatedTokens[tokenIndex];\n    if (currentToken.type === MlParserTokenType.ENCODED_ENTITY) {\n      const [decoded, encoded] = currentToken.parts;\n      consumedInOriginalTemplate += encoded.length;\n      consumedInInput += decoded.length;\n    } else {\n      const lengthOfParts = currentToken.parts.reduce((sum, current) => sum + current.length, 0);\n      consumedInInput += lengthOfParts;\n      consumedInOriginalTemplate += lengthOfParts;\n    }\n    offsetMap.set(consumedInInput, consumedInOriginalTemplate);\n    tokenIndex++;\n  }\n  return offsetMap;\n}\n"]} |
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