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 { ParseError, ParseSourceSpan } from '../parse_util';
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9 | import * as html from './ast';
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10 | import { NAMED_ENTITIES } from './entities';
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11 | import { tokenize } from './lexer';
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12 | import { getNsPrefix, mergeNsAndName, splitNsName } from './tags';
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13 | export class TreeError extends ParseError {
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14 | constructor(elementName, span, msg) {
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15 | super(span, msg);
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16 | this.elementName = elementName;
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17 | }
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18 | static create(elementName, span, msg) {
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19 | return new TreeError(elementName, span, msg);
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20 | }
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21 | }
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22 | export class ParseTreeResult {
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23 | constructor(rootNodes, errors) {
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24 | this.rootNodes = rootNodes;
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25 | this.errors = errors;
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26 | }
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27 | }
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28 | export class Parser {
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29 | constructor(getTagDefinition) {
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30 | this.getTagDefinition = getTagDefinition;
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31 | }
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32 | parse(source, url, options) {
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33 | const tokenizeResult = tokenize(source, url, this.getTagDefinition, options);
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34 | const parser = new _TreeBuilder(tokenizeResult.tokens, this.getTagDefinition);
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35 | parser.build();
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36 | return new ParseTreeResult(parser.rootNodes, tokenizeResult.errors.concat(parser.errors));
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37 | }
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38 | }
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39 | class _TreeBuilder {
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40 | constructor(tokens, getTagDefinition) {
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41 | this.tokens = tokens;
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42 | this.getTagDefinition = getTagDefinition;
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43 | this._index = -1;
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44 | this._elementStack = [];
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45 | this.rootNodes = [];
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46 | this.errors = [];
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47 | this._advance();
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48 | }
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49 | build() {
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50 | while (this._peek.type !== 24 /* EOF */) {
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51 | if (this._peek.type === 0 /* TAG_OPEN_START */ ||
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52 | this._peek.type === 4 /* INCOMPLETE_TAG_OPEN */) {
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53 | this._consumeStartTag(this._advance());
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54 | }
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55 | else if (this._peek.type === 3 /* TAG_CLOSE */) {
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56 | this._consumeEndTag(this._advance());
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57 | }
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58 | else if (this._peek.type === 12 /* CDATA_START */) {
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59 | this._closeVoidElement();
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60 | this._consumeCdata(this._advance());
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61 | }
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62 | else if (this._peek.type === 10 /* COMMENT_START */) {
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63 | this._closeVoidElement();
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64 | this._consumeComment(this._advance());
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65 | }
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66 | else if (this._peek.type === 5 /* TEXT */ || this._peek.type === 7 /* RAW_TEXT */ ||
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67 | this._peek.type === 6 /* ESCAPABLE_RAW_TEXT */) {
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68 | this._closeVoidElement();
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69 | this._consumeText(this._advance());
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70 | }
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71 | else if (this._peek.type === 19 /* EXPANSION_FORM_START */) {
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72 | this._consumeExpansion(this._advance());
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73 | }
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74 | else {
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75 | // Skip all other tokens...
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76 | this._advance();
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77 | }
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78 | }
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79 | }
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80 | _advance() {
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81 | const prev = this._peek;
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82 | if (this._index < this.tokens.length - 1) {
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83 | // Note: there is always an EOF token at the end
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84 | this._index++;
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85 | }
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86 | this._peek = this.tokens[this._index];
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87 | return prev;
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88 | }
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89 | _advanceIf(type) {
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90 | if (this._peek.type === type) {
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91 | return this._advance();
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92 | }
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93 | return null;
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94 | }
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95 | _consumeCdata(_startToken) {
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96 | this._consumeText(this._advance());
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97 | this._advanceIf(13 /* CDATA_END */);
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98 | }
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99 | _consumeComment(token) {
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100 | const text = this._advanceIf(7 /* RAW_TEXT */);
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101 | this._advanceIf(11 /* COMMENT_END */);
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102 | const value = text != null ? text.parts[0].trim() : null;
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103 | this._addToParent(new html.Comment(value, token.sourceSpan));
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104 | }
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105 | _consumeExpansion(token) {
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106 | const switchValue = this._advance();
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107 | const type = this._advance();
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108 | const cases = [];
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109 | // read =
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110 | while (this._peek.type === 20 /* EXPANSION_CASE_VALUE */) {
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111 | const expCase = this._parseExpansionCase();
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112 | if (!expCase)
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113 | return; // error
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114 | cases.push(expCase);
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115 | }
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116 | // read the final }
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117 | if (this._peek.type !== 23 /* EXPANSION_FORM_END */) {
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118 | this.errors.push(TreeError.create(null, this._peek.sourceSpan, `Invalid ICU message. Missing '}'.`));
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119 | return;
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120 | }
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121 | const sourceSpan = new ParseSourceSpan(token.sourceSpan.start, this._peek.sourceSpan.end, token.sourceSpan.fullStart);
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122 | this._addToParent(new html.Expansion(switchValue.parts[0], type.parts[0], cases, sourceSpan, switchValue.sourceSpan));
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123 | this._advance();
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124 | }
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125 | _parseExpansionCase() {
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126 | const value = this._advance();
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127 | // read {
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128 | if (this._peek.type !== 21 /* EXPANSION_CASE_EXP_START */) {
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129 | this.errors.push(TreeError.create(null, this._peek.sourceSpan, `Invalid ICU message. Missing '{'.`));
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130 | return null;
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131 | }
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132 | // read until }
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133 | const start = this._advance();
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134 | const exp = this._collectExpansionExpTokens(start);
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135 | if (!exp)
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136 | return null;
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137 | const end = this._advance();
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138 | exp.push({ type: 24 /* EOF */, parts: [], sourceSpan: end.sourceSpan });
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139 | // parse everything in between { and }
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140 | const expansionCaseParser = new _TreeBuilder(exp, this.getTagDefinition);
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141 | expansionCaseParser.build();
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142 | if (expansionCaseParser.errors.length > 0) {
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143 | this.errors = this.errors.concat(expansionCaseParser.errors);
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144 | return null;
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145 | }
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146 | const sourceSpan = new ParseSourceSpan(value.sourceSpan.start, end.sourceSpan.end, value.sourceSpan.fullStart);
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147 | const expSourceSpan = new ParseSourceSpan(start.sourceSpan.start, end.sourceSpan.end, start.sourceSpan.fullStart);
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148 | return new html.ExpansionCase(value.parts[0], expansionCaseParser.rootNodes, sourceSpan, value.sourceSpan, expSourceSpan);
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149 | }
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150 | _collectExpansionExpTokens(start) {
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151 | const exp = [];
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152 | const expansionFormStack = [21 /* EXPANSION_CASE_EXP_START */];
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153 | while (true) {
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154 | if (this._peek.type === 19 /* EXPANSION_FORM_START */ ||
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155 | this._peek.type === 21 /* EXPANSION_CASE_EXP_START */) {
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156 | expansionFormStack.push(this._peek.type);
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157 | }
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158 | if (this._peek.type === 22 /* EXPANSION_CASE_EXP_END */) {
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159 | if (lastOnStack(expansionFormStack, 21 /* EXPANSION_CASE_EXP_START */)) {
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160 | expansionFormStack.pop();
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161 | if (expansionFormStack.length === 0)
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162 | return exp;
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163 | }
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164 | else {
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165 | this.errors.push(TreeError.create(null, start.sourceSpan, `Invalid ICU message. Missing '}'.`));
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166 | return null;
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167 | }
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168 | }
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169 | if (this._peek.type === 23 /* EXPANSION_FORM_END */) {
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170 | if (lastOnStack(expansionFormStack, 19 /* EXPANSION_FORM_START */)) {
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171 | expansionFormStack.pop();
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172 | }
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173 | else {
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174 | this.errors.push(TreeError.create(null, start.sourceSpan, `Invalid ICU message. Missing '}'.`));
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175 | return null;
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176 | }
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177 | }
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178 | if (this._peek.type === 24 /* EOF */) {
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179 | this.errors.push(TreeError.create(null, start.sourceSpan, `Invalid ICU message. Missing '}'.`));
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180 | return null;
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181 | }
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182 | exp.push(this._advance());
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183 | }
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184 | }
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185 | _consumeText(token) {
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186 | const tokens = [token];
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187 | const startSpan = token.sourceSpan;
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188 | let text = token.parts[0];
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189 | if (text.length > 0 && text[0] === '\n') {
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190 | const parent = this._getParentElement();
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191 | if (parent != null && parent.children.length === 0 &&
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192 | this.getTagDefinition(parent.name).ignoreFirstLf) {
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193 | text = text.substring(1);
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194 | tokens[0] = { type: token.type, sourceSpan: token.sourceSpan, parts: [text] };
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195 | }
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196 | }
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197 | while (this._peek.type === 8 /* INTERPOLATION */ || this._peek.type === 5 /* TEXT */ ||
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198 | this._peek.type === 9 /* ENCODED_ENTITY */) {
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199 | token = this._advance();
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200 | tokens.push(token);
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201 | if (token.type === 8 /* INTERPOLATION */) {
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202 | // For backward compatibility we decode HTML entities that appear in interpolation
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203 | // expressions. This is arguably a bug, but it could be a considerable breaking change to
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204 | // fix it. It should be addressed in a larger project to refactor the entire parser/lexer
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205 | // chain after View Engine has been removed.
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206 | text += token.parts.join('').replace(/&([^;]+);/g, decodeEntity);
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207 | }
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208 | else if (token.type === 9 /* ENCODED_ENTITY */) {
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209 | text += token.parts[0];
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210 | }
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211 | else {
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212 | text += token.parts.join('');
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213 | }
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214 | }
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215 | if (text.length > 0) {
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216 | const endSpan = token.sourceSpan;
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217 | this._addToParent(new html.Text(text, new ParseSourceSpan(startSpan.start, endSpan.end, startSpan.fullStart, startSpan.details), tokens));
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218 | }
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219 | }
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220 | _closeVoidElement() {
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221 | const el = this._getParentElement();
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222 | if (el && this.getTagDefinition(el.name).isVoid) {
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223 | this._elementStack.pop();
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224 | }
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225 | }
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226 | _consumeStartTag(startTagToken) {
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227 | const [prefix, name] = startTagToken.parts;
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228 | const attrs = [];
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229 | while (this._peek.type === 14 /* ATTR_NAME */) {
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230 | attrs.push(this._consumeAttr(this._advance()));
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231 | }
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232 | const fullName = this._getElementFullName(prefix, name, this._getParentElement());
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233 | let selfClosing = false;
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234 | // Note: There could have been a tokenizer error
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235 | // so that we don't get a token for the end tag...
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236 | if (this._peek.type === 2 /* TAG_OPEN_END_VOID */) {
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237 | this._advance();
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238 | selfClosing = true;
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239 | const tagDef = this.getTagDefinition(fullName);
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240 | if (!(tagDef.canSelfClose || getNsPrefix(fullName) !== null || tagDef.isVoid)) {
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241 | this.errors.push(TreeError.create(fullName, startTagToken.sourceSpan, `Only void and foreign elements can be self closed "${startTagToken.parts[1]}"`));
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242 | }
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243 | }
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244 | else if (this._peek.type === 1 /* TAG_OPEN_END */) {
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245 | this._advance();
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246 | selfClosing = false;
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247 | }
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248 | const end = this._peek.sourceSpan.fullStart;
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249 | const span = new ParseSourceSpan(startTagToken.sourceSpan.start, end, startTagToken.sourceSpan.fullStart);
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250 | // Create a separate `startSpan` because `span` will be modified when there is an `end` span.
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251 | const startSpan = new ParseSourceSpan(startTagToken.sourceSpan.start, end, startTagToken.sourceSpan.fullStart);
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252 | const el = new html.Element(fullName, attrs, [], span, startSpan, undefined);
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253 | this._pushElement(el);
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254 | if (selfClosing) {
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255 | // Elements that are self-closed have their `endSourceSpan` set to the full span, as the
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256 | // element start tag also represents the end tag.
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257 | this._popElement(fullName, span);
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258 | }
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259 | else if (startTagToken.type === 4 /* INCOMPLETE_TAG_OPEN */) {
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260 | // We already know the opening tag is not complete, so it is unlikely it has a corresponding
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261 | // close tag. Let's optimistically parse it as a full element and emit an error.
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262 | this._popElement(fullName, null);
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263 | this.errors.push(TreeError.create(fullName, span, `Opening tag "${fullName}" not terminated.`));
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264 | }
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265 | }
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266 | _pushElement(el) {
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267 | const parentEl = this._getParentElement();
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268 | if (parentEl && this.getTagDefinition(parentEl.name).isClosedByChild(el.name)) {
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269 | this._elementStack.pop();
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270 | }
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271 | this._addToParent(el);
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272 | this._elementStack.push(el);
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273 | }
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274 | _consumeEndTag(endTagToken) {
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275 | const fullName = this._getElementFullName(endTagToken.parts[0], endTagToken.parts[1], this._getParentElement());
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276 | if (this.getTagDefinition(fullName).isVoid) {
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277 | this.errors.push(TreeError.create(fullName, endTagToken.sourceSpan, `Void elements do not have end tags "${endTagToken.parts[1]}"`));
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278 | }
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279 | else if (!this._popElement(fullName, endTagToken.sourceSpan)) {
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280 | const errMsg = `Unexpected closing tag "${fullName}". It may happen when the tag has already been closed by another tag. For more info see https://www.w3.org/TR/html5/syntax.html#closing-elements-that-have-implied-end-tags`;
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281 | this.errors.push(TreeError.create(fullName, endTagToken.sourceSpan, errMsg));
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282 | }
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283 | }
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284 | /**
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285 | * Closes the nearest element with the tag name `fullName` in the parse tree.
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286 | * `endSourceSpan` is the span of the closing tag, or null if the element does
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287 | * not have a closing tag (for example, this happens when an incomplete
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288 | * opening tag is recovered).
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289 | */
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290 | _popElement(fullName, endSourceSpan) {
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291 | let unexpectedCloseTagDetected = false;
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292 | for (let stackIndex = this._elementStack.length - 1; stackIndex >= 0; stackIndex--) {
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293 | const el = this._elementStack[stackIndex];
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294 | if (el.name === fullName) {
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295 | // Record the parse span with the element that is being closed. Any elements that are
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296 | // removed from the element stack at this point are closed implicitly, so they won't get
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297 | // an end source span (as there is no explicit closing element).
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298 | el.endSourceSpan = endSourceSpan;
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299 | el.sourceSpan.end = endSourceSpan !== null ? endSourceSpan.end : el.sourceSpan.end;
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300 | this._elementStack.splice(stackIndex, this._elementStack.length - stackIndex);
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301 | return !unexpectedCloseTagDetected;
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302 | }
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303 | if (!this.getTagDefinition(el.name).closedByParent) {
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304 | // Note that we encountered an unexpected close tag but continue processing the element
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305 | // stack so we can assign an `endSourceSpan` if there is a corresponding start tag for this
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306 | // end tag in the stack.
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307 | unexpectedCloseTagDetected = true;
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308 | }
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309 | }
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310 | return false;
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311 | }
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312 | _consumeAttr(attrName) {
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313 | const fullName = mergeNsAndName(attrName.parts[0], attrName.parts[1]);
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314 | let attrEnd = attrName.sourceSpan.end;
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315 | // Consume any quote
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316 | if (this._peek.type === 15 /* ATTR_QUOTE */) {
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317 | this._advance();
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318 | }
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319 | // Consume the attribute value
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320 | let value = '';
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321 | const valueTokens = [];
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322 | let valueStartSpan = undefined;
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323 | let valueEnd = undefined;
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324 | // NOTE: We need to use a new variable `nextTokenType` here to hide the actual type of
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325 | // `_peek.type` from TS. Otherwise TS will narrow the type of `_peek.type` preventing it from
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326 | // being able to consider `ATTR_VALUE_INTERPOLATION` as an option. This is because TS is not
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327 | // able to see that `_advance()` will actually mutate `_peek`.
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328 | const nextTokenType = this._peek.type;
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329 | if (nextTokenType === 16 /* ATTR_VALUE_TEXT */) {
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330 | valueStartSpan = this._peek.sourceSpan;
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331 | valueEnd = this._peek.sourceSpan.end;
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332 | while (this._peek.type === 16 /* ATTR_VALUE_TEXT */ ||
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333 | this._peek.type === 17 /* ATTR_VALUE_INTERPOLATION */ ||
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334 | this._peek.type === 9 /* ENCODED_ENTITY */) {
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335 | const valueToken = this._advance();
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336 | valueTokens.push(valueToken);
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337 | if (valueToken.type === 17 /* ATTR_VALUE_INTERPOLATION */) {
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338 | // For backward compatibility we decode HTML entities that appear in interpolation
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339 | // expressions. This is arguably a bug, but it could be a considerable breaking change to
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340 | // fix it. It should be addressed in a larger project to refactor the entire parser/lexer
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341 | // chain after View Engine has been removed.
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342 | value += valueToken.parts.join('').replace(/&([^;]+);/g, decodeEntity);
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343 | }
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344 | else if (valueToken.type === 9 /* ENCODED_ENTITY */) {
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345 | value += valueToken.parts[0];
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346 | }
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347 | else {
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348 | value += valueToken.parts.join('');
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349 | }
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350 | valueEnd = attrEnd = valueToken.sourceSpan.end;
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351 | }
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352 | }
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353 | // Consume any quote
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354 | if (this._peek.type === 15 /* ATTR_QUOTE */) {
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355 | const quoteToken = this._advance();
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356 | attrEnd = quoteToken.sourceSpan.end;
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357 | }
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358 | const valueSpan = valueStartSpan && valueEnd &&
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359 | new ParseSourceSpan(valueStartSpan.start, valueEnd, valueStartSpan.fullStart);
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360 | return new html.Attribute(fullName, value, new ParseSourceSpan(attrName.sourceSpan.start, attrEnd, attrName.sourceSpan.fullStart), attrName.sourceSpan, valueSpan, valueTokens.length > 0 ? valueTokens : undefined, undefined);
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361 | }
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362 | _getParentElement() {
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363 | return this._elementStack.length > 0 ? this._elementStack[this._elementStack.length - 1] : null;
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364 | }
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365 | _addToParent(node) {
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366 | const parent = this._getParentElement();
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367 | if (parent != null) {
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368 | parent.children.push(node);
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369 | }
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370 | else {
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371 | this.rootNodes.push(node);
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372 | }
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373 | }
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374 | _getElementFullName(prefix, localName, parentElement) {
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375 | if (prefix === '') {
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376 | prefix = this.getTagDefinition(localName).implicitNamespacePrefix || '';
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377 | if (prefix === '' && parentElement != null) {
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378 | const parentTagName = splitNsName(parentElement.name)[1];
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379 | const parentTagDefinition = this.getTagDefinition(parentTagName);
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380 | if (!parentTagDefinition.preventNamespaceInheritance) {
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381 | prefix = getNsPrefix(parentElement.name);
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382 | }
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383 | }
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384 | }
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385 | return mergeNsAndName(prefix, localName);
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386 | }
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387 | }
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388 | function lastOnStack(stack, element) {
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389 | return stack.length > 0 && stack[stack.length - 1] === element;
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390 | }
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391 | /**
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392 | * Decode the `entity` string, which we believe is the contents of an HTML entity.
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393 | *
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394 | * If the string is not actually a valid/known entity then just return the original `match` string.
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395 | */
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396 | function decodeEntity(match, entity) {
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397 | if (NAMED_ENTITIES[entity] !== undefined) {
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398 | return NAMED_ENTITIES[entity] || match;
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399 | }
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400 | if (/^#x[a-f0-9]+$/i.test(entity)) {
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401 | return String.fromCodePoint(parseInt(entity.slice(2), 16));
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402 | }
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403 | if (/^#\d+$/.test(entity)) {
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404 | return String.fromCodePoint(parseInt(entity.slice(1), 10));
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405 | }
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406 | return match;
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407 | }
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408 | //# 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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 {ParseError, ParseLocation, ParseSourceSpan} from '../parse_util';\n\nimport * as html from './ast';\nimport {NAMED_ENTITIES} from './entities';\nimport {tokenize, TokenizeOptions} from './lexer';\nimport {getNsPrefix, mergeNsAndName, splitNsName, TagDefinition} from './tags';\nimport {AttributeNameToken, AttributeQuoteToken, CdataStartToken, CommentStartToken, ExpansionCaseExpressionEndToken, ExpansionCaseExpressionStartToken, ExpansionCaseValueToken, ExpansionFormStartToken, IncompleteTagOpenToken, InterpolatedAttributeToken, InterpolatedTextToken, TagCloseToken, TagOpenStartToken, TextToken, Token, TokenType} from './tokens';\n\nexport class TreeError extends ParseError {\n  static create(elementName: string|null, span: ParseSourceSpan, msg: string): TreeError {\n    return new TreeError(elementName, span, msg);\n  }\n\n  constructor(public elementName: string|null, span: ParseSourceSpan, msg: string) {\n    super(span, msg);\n  }\n}\n\nexport class ParseTreeResult {\n  constructor(public rootNodes: html.Node[], public errors: ParseError[]) {}\n}\n\nexport class Parser {\n  constructor(public getTagDefinition: (tagName: string) => TagDefinition) {}\n\n  parse(source: string, url: string, options?: TokenizeOptions): ParseTreeResult {\n    const tokenizeResult = tokenize(source, url, this.getTagDefinition, options);\n    const parser = new _TreeBuilder(tokenizeResult.tokens, this.getTagDefinition);\n    parser.build();\n    return new ParseTreeResult(\n        parser.rootNodes,\n        (tokenizeResult.errors as ParseError[]).concat(parser.errors),\n    );\n  }\n}\n\nclass _TreeBuilder {\n  private _index: number = -1;\n  // `_peek` will be initialized by the call to `_advance()` in the constructor.\n  private _peek!: Token;\n  private _elementStack: html.Element[] = [];\n\n  rootNodes: html.Node[] = [];\n  errors: TreeError[] = [];\n\n  constructor(\n      private tokens: Token[], private getTagDefinition: (tagName: string) => TagDefinition) {\n    this._advance();\n  }\n\n  build(): void {\n    while (this._peek.type !== TokenType.EOF) {\n      if (this._peek.type === TokenType.TAG_OPEN_START ||\n          this._peek.type === TokenType.INCOMPLETE_TAG_OPEN) {\n        this._consumeStartTag(this._advance<TagOpenStartToken|IncompleteTagOpenToken>());\n      } else if (this._peek.type === TokenType.TAG_CLOSE) {\n        this._consumeEndTag(this._advance<TagCloseToken>());\n      } else if (this._peek.type === TokenType.CDATA_START) {\n        this._closeVoidElement();\n        this._consumeCdata(this._advance<CdataStartToken>());\n      } else if (this._peek.type === TokenType.COMMENT_START) {\n        this._closeVoidElement();\n        this._consumeComment(this._advance<CommentStartToken>());\n      } else if (\n          this._peek.type === TokenType.TEXT || this._peek.type === TokenType.RAW_TEXT ||\n          this._peek.type === TokenType.ESCAPABLE_RAW_TEXT) {\n        this._closeVoidElement();\n        this._consumeText(this._advance<TextToken>());\n      } else if (this._peek.type === TokenType.EXPANSION_FORM_START) {\n        this._consumeExpansion(this._advance<ExpansionFormStartToken>());\n      } else {\n        // Skip all other tokens...\n        this._advance();\n      }\n    }\n  }\n\n  private _advance<T extends Token>(): T {\n    const prev = this._peek;\n    if (this._index < this.tokens.length - 1) {\n      // Note: there is always an EOF token at the end\n      this._index++;\n    }\n    this._peek = this.tokens[this._index];\n    return prev as T;\n  }\n\n  private _advanceIf<T extends TokenType>(type: T): (Token&{type: T})|null {\n    if (this._peek.type === type) {\n      return this._advance<Token&{type: T}>();\n    }\n    return null;\n  }\n\n  private _consumeCdata(_startToken: CdataStartToken) {\n    this._consumeText(this._advance<TextToken>());\n    this._advanceIf(TokenType.CDATA_END);\n  }\n\n  private _consumeComment(token: CommentStartToken) {\n    const text = this._advanceIf(TokenType.RAW_TEXT);\n    this._advanceIf(TokenType.COMMENT_END);\n    const value = text != null ? text.parts[0].trim() : null;\n    this._addToParent(new html.Comment(value, token.sourceSpan));\n  }\n\n  private _consumeExpansion(token: ExpansionFormStartToken) {\n    const switchValue = this._advance<TextToken>();\n\n    const type = this._advance<TextToken>();\n    const cases: html.ExpansionCase[] = [];\n\n    // read =\n    while (this._peek.type === TokenType.EXPANSION_CASE_VALUE) {\n      const expCase = this._parseExpansionCase();\n      if (!expCase) return;  // error\n      cases.push(expCase);\n    }\n\n    // read the final }\n    if (this._peek.type !== TokenType.EXPANSION_FORM_END) {\n      this.errors.push(\n          TreeError.create(null, this._peek.sourceSpan, `Invalid ICU message. Missing '}'.`));\n      return;\n    }\n    const sourceSpan = new ParseSourceSpan(\n        token.sourceSpan.start, this._peek.sourceSpan.end, token.sourceSpan.fullStart);\n    this._addToParent(new html.Expansion(\n        switchValue.parts[0], type.parts[0], cases, sourceSpan, switchValue.sourceSpan));\n\n    this._advance();\n  }\n\n  private _parseExpansionCase(): html.ExpansionCase|null {\n    const value = this._advance<ExpansionCaseValueToken>();\n\n    // read {\n    if (this._peek.type !== TokenType.EXPANSION_CASE_EXP_START) {\n      this.errors.push(\n          TreeError.create(null, this._peek.sourceSpan, `Invalid ICU message. Missing '{'.`));\n      return null;\n    }\n\n    // read until }\n    const start = this._advance<ExpansionCaseExpressionStartToken>();\n\n    const exp = this._collectExpansionExpTokens(start);\n    if (!exp) return null;\n\n    const end = this._advance<ExpansionCaseExpressionEndToken>();\n    exp.push({type: TokenType.EOF, parts: [], sourceSpan: end.sourceSpan});\n\n    // parse everything in between { and }\n    const expansionCaseParser = new _TreeBuilder(exp, this.getTagDefinition);\n    expansionCaseParser.build();\n    if (expansionCaseParser.errors.length > 0) {\n      this.errors = this.errors.concat(expansionCaseParser.errors);\n      return null;\n    }\n\n    const sourceSpan =\n        new ParseSourceSpan(value.sourceSpan.start, end.sourceSpan.end, value.sourceSpan.fullStart);\n    const expSourceSpan =\n        new ParseSourceSpan(start.sourceSpan.start, end.sourceSpan.end, start.sourceSpan.fullStart);\n    return new html.ExpansionCase(\n        value.parts[0], expansionCaseParser.rootNodes, sourceSpan, value.sourceSpan, expSourceSpan);\n  }\n\n  private _collectExpansionExpTokens(start: Token): Token[]|null {\n    const exp: Token[] = [];\n    const expansionFormStack = [TokenType.EXPANSION_CASE_EXP_START];\n\n    while (true) {\n      if (this._peek.type === TokenType.EXPANSION_FORM_START ||\n          this._peek.type === TokenType.EXPANSION_CASE_EXP_START) {\n        expansionFormStack.push(this._peek.type);\n      }\n\n      if (this._peek.type === TokenType.EXPANSION_CASE_EXP_END) {\n        if (lastOnStack(expansionFormStack, TokenType.EXPANSION_CASE_EXP_START)) {\n          expansionFormStack.pop();\n          if (expansionFormStack.length === 0) return exp;\n\n        } else {\n          this.errors.push(\n              TreeError.create(null, start.sourceSpan, `Invalid ICU message. Missing '}'.`));\n          return null;\n        }\n      }\n\n      if (this._peek.type === TokenType.EXPANSION_FORM_END) {\n        if (lastOnStack(expansionFormStack, TokenType.EXPANSION_FORM_START)) {\n          expansionFormStack.pop();\n        } else {\n          this.errors.push(\n              TreeError.create(null, start.sourceSpan, `Invalid ICU message. Missing '}'.`));\n          return null;\n        }\n      }\n\n      if (this._peek.type === TokenType.EOF) {\n        this.errors.push(\n            TreeError.create(null, start.sourceSpan, `Invalid ICU message. Missing '}'.`));\n        return null;\n      }\n\n      exp.push(this._advance());\n    }\n  }\n\n  private _consumeText(token: InterpolatedTextToken) {\n    const tokens = [token];\n    const startSpan = token.sourceSpan;\n    let text = token.parts[0];\n    if (text.length > 0 && text[0] === '\\n') {\n      const parent = this._getParentElement();\n      if (parent != null && parent.children.length === 0 &&\n          this.getTagDefinition(parent.name).ignoreFirstLf) {\n        text = text.substring(1);\n        tokens[0] = {type: token.type, sourceSpan: token.sourceSpan, parts: [text]} as typeof token;\n      }\n    }\n\n    while (this._peek.type === TokenType.INTERPOLATION || this._peek.type === TokenType.TEXT ||\n           this._peek.type === TokenType.ENCODED_ENTITY) {\n      token = this._advance();\n      tokens.push(token);\n      if (token.type === TokenType.INTERPOLATION) {\n        // For backward compatibility we decode HTML entities that appear in interpolation\n        // expressions. This is arguably a bug, but it could be a considerable breaking change to\n        // fix it. It should be addressed in a larger project to refactor the entire parser/lexer\n        // chain after View Engine has been removed.\n        text += token.parts.join('').replace(/&([^;]+);/g, decodeEntity);\n      } else if (token.type === TokenType.ENCODED_ENTITY) {\n        text += token.parts[0];\n      } else {\n        text += token.parts.join('');\n      }\n    }\n\n    if (text.length > 0) {\n      const endSpan = token.sourceSpan;\n      this._addToParent(new html.Text(\n          text,\n          new ParseSourceSpan(startSpan.start, endSpan.end, startSpan.fullStart, startSpan.details),\n          tokens));\n    }\n  }\n\n  private _closeVoidElement(): void {\n    const el = this._getParentElement();\n    if (el && this.getTagDefinition(el.name).isVoid) {\n      this._elementStack.pop();\n    }\n  }\n\n  private _consumeStartTag(startTagToken: TagOpenStartToken|IncompleteTagOpenToken) {\n    const [prefix, name] = startTagToken.parts;\n    const attrs: html.Attribute[] = [];\n    while (this._peek.type === TokenType.ATTR_NAME) {\n      attrs.push(this._consumeAttr(this._advance<AttributeNameToken>()));\n    }\n    const fullName = this._getElementFullName(prefix, name, this._getParentElement());\n    let selfClosing = false;\n    // Note: There could have been a tokenizer error\n    // so that we don't get a token for the end tag...\n    if (this._peek.type === TokenType.TAG_OPEN_END_VOID) {\n      this._advance();\n      selfClosing = true;\n      const tagDef = this.getTagDefinition(fullName);\n      if (!(tagDef.canSelfClose || getNsPrefix(fullName) !== null || tagDef.isVoid)) {\n        this.errors.push(TreeError.create(\n            fullName, startTagToken.sourceSpan,\n            `Only void and foreign elements can be self closed \"${startTagToken.parts[1]}\"`));\n      }\n    } else if (this._peek.type === TokenType.TAG_OPEN_END) {\n      this._advance();\n      selfClosing = false;\n    }\n    const end = this._peek.sourceSpan.fullStart;\n    const span = new ParseSourceSpan(\n        startTagToken.sourceSpan.start, end, startTagToken.sourceSpan.fullStart);\n    // Create a separate `startSpan` because `span` will be modified when there is an `end` span.\n    const startSpan = new ParseSourceSpan(\n        startTagToken.sourceSpan.start, end, startTagToken.sourceSpan.fullStart);\n    const el = new html.Element(fullName, attrs, [], span, startSpan, undefined);\n    this._pushElement(el);\n    if (selfClosing) {\n      // Elements that are self-closed have their `endSourceSpan` set to the full span, as the\n      // element start tag also represents the end tag.\n      this._popElement(fullName, span);\n    } else if (startTagToken.type === TokenType.INCOMPLETE_TAG_OPEN) {\n      // We already know the opening tag is not complete, so it is unlikely it has a corresponding\n      // close tag. Let's optimistically parse it as a full element and emit an error.\n      this._popElement(fullName, null);\n      this.errors.push(\n          TreeError.create(fullName, span, `Opening tag \"${fullName}\" not terminated.`));\n    }\n  }\n\n  private _pushElement(el: html.Element) {\n    const parentEl = this._getParentElement();\n\n    if (parentEl && this.getTagDefinition(parentEl.name).isClosedByChild(el.name)) {\n      this._elementStack.pop();\n    }\n\n    this._addToParent(el);\n    this._elementStack.push(el);\n  }\n\n  private _consumeEndTag(endTagToken: TagCloseToken) {\n    const fullName = this._getElementFullName(\n        endTagToken.parts[0], endTagToken.parts[1], this._getParentElement());\n\n    if (this.getTagDefinition(fullName).isVoid) {\n      this.errors.push(TreeError.create(\n          fullName, endTagToken.sourceSpan,\n          `Void elements do not have end tags \"${endTagToken.parts[1]}\"`));\n    } else if (!this._popElement(fullName, endTagToken.sourceSpan)) {\n      const errMsg = `Unexpected closing tag \"${\n          fullName}\". It may happen when the tag has already been closed by another tag. For more info see https://www.w3.org/TR/html5/syntax.html#closing-elements-that-have-implied-end-tags`;\n      this.errors.push(TreeError.create(fullName, endTagToken.sourceSpan, errMsg));\n    }\n  }\n\n  /**\n   * Closes the nearest element with the tag name `fullName` in the parse tree.\n   * `endSourceSpan` is the span of the closing tag, or null if the element does\n   * not have a closing tag (for example, this happens when an incomplete\n   * opening tag is recovered).\n   */\n  private _popElement(fullName: string, endSourceSpan: ParseSourceSpan|null): boolean {\n    let unexpectedCloseTagDetected = false;\n    for (let stackIndex = this._elementStack.length - 1; stackIndex >= 0; stackIndex--) {\n      const el = this._elementStack[stackIndex];\n      if (el.name === fullName) {\n        // Record the parse span with the element that is being closed. Any elements that are\n        // removed from the element stack at this point are closed implicitly, so they won't get\n        // an end source span (as there is no explicit closing element).\n        el.endSourceSpan = endSourceSpan;\n        el.sourceSpan.end = endSourceSpan !== null ? endSourceSpan.end : el.sourceSpan.end;\n\n        this._elementStack.splice(stackIndex, this._elementStack.length - stackIndex);\n        return !unexpectedCloseTagDetected;\n      }\n\n      if (!this.getTagDefinition(el.name).closedByParent) {\n        // Note that we encountered an unexpected close tag but continue processing the element\n        // stack so we can assign an `endSourceSpan` if there is a corresponding start tag for this\n        // end tag in the stack.\n        unexpectedCloseTagDetected = true;\n      }\n    }\n    return false;\n  }\n\n  private _consumeAttr(attrName: AttributeNameToken): html.Attribute {\n    const fullName = mergeNsAndName(attrName.parts[0], attrName.parts[1]);\n    let attrEnd = attrName.sourceSpan.end;\n\n    // Consume any quote\n    if (this._peek.type === TokenType.ATTR_QUOTE) {\n      this._advance();\n    }\n\n    // Consume the attribute value\n    let value = '';\n    const valueTokens: InterpolatedAttributeToken[] = [];\n    let valueStartSpan: ParseSourceSpan|undefined = undefined;\n    let valueEnd: ParseLocation|undefined = undefined;\n    // NOTE: We need to use a new variable `nextTokenType` here to hide the actual type of\n    // `_peek.type` from TS. Otherwise TS will narrow the type of `_peek.type` preventing it from\n    // being able to consider `ATTR_VALUE_INTERPOLATION` as an option. This is because TS is not\n    // able to see that `_advance()` will actually mutate `_peek`.\n    const nextTokenType = this._peek.type as TokenType;\n    if (nextTokenType === TokenType.ATTR_VALUE_TEXT) {\n      valueStartSpan = this._peek.sourceSpan;\n      valueEnd = this._peek.sourceSpan.end;\n      while (this._peek.type === TokenType.ATTR_VALUE_TEXT ||\n             this._peek.type === TokenType.ATTR_VALUE_INTERPOLATION ||\n             this._peek.type === TokenType.ENCODED_ENTITY) {\n        const valueToken = this._advance<InterpolatedAttributeToken>();\n        valueTokens.push(valueToken);\n        if (valueToken.type === TokenType.ATTR_VALUE_INTERPOLATION) {\n          // For backward compatibility we decode HTML entities that appear in interpolation\n          // expressions. This is arguably a bug, but it could be a considerable breaking change to\n          // fix it. It should be addressed in a larger project to refactor the entire parser/lexer\n          // chain after View Engine has been removed.\n          value += valueToken.parts.join('').replace(/&([^;]+);/g, decodeEntity);\n        } else if (valueToken.type === TokenType.ENCODED_ENTITY) {\n          value += valueToken.parts[0];\n        } else {\n          value += valueToken.parts.join('');\n        }\n        valueEnd = attrEnd = valueToken.sourceSpan.end;\n      }\n    }\n\n    // Consume any quote\n    if (this._peek.type === TokenType.ATTR_QUOTE) {\n      const quoteToken = this._advance<AttributeQuoteToken>();\n      attrEnd = quoteToken.sourceSpan.end;\n    }\n\n    const valueSpan = valueStartSpan && valueEnd &&\n        new ParseSourceSpan(valueStartSpan.start, valueEnd, valueStartSpan.fullStart);\n    return new html.Attribute(\n        fullName, value,\n        new ParseSourceSpan(attrName.sourceSpan.start, attrEnd, attrName.sourceSpan.fullStart),\n        attrName.sourceSpan, valueSpan, valueTokens.length > 0 ? valueTokens : undefined,\n        undefined);\n  }\n\n  private _getParentElement(): html.Element|null {\n    return this._elementStack.length > 0 ? this._elementStack[this._elementStack.length - 1] : null;\n  }\n\n  private _addToParent(node: html.Node) {\n    const parent = this._getParentElement();\n    if (parent != null) {\n      parent.children.push(node);\n    } else {\n      this.rootNodes.push(node);\n    }\n  }\n\n  private _getElementFullName(prefix: string, localName: string, parentElement: html.Element|null):\n      string {\n    if (prefix === '') {\n      prefix = this.getTagDefinition(localName).implicitNamespacePrefix || '';\n      if (prefix === '' && parentElement != null) {\n        const parentTagName = splitNsName(parentElement.name)[1];\n        const parentTagDefinition = this.getTagDefinition(parentTagName);\n        if (!parentTagDefinition.preventNamespaceInheritance) {\n          prefix = getNsPrefix(parentElement.name);\n        }\n      }\n    }\n\n    return mergeNsAndName(prefix, localName);\n  }\n}\n\nfunction lastOnStack(stack: any[], element: any): boolean {\n  return stack.length > 0 && stack[stack.length - 1] === element;\n}\n\n/**\n * Decode the `entity` string, which we believe is the contents of an HTML entity.\n *\n * If the string is not actually a valid/known entity then just return the original `match` string.\n */\nfunction decodeEntity(match: string, entity: string): string {\n  if (NAMED_ENTITIES[entity] !== undefined) {\n    return NAMED_ENTITIES[entity] || match;\n  }\n  if (/^#x[a-f0-9]+$/i.test(entity)) {\n    return String.fromCodePoint(parseInt(entity.slice(2), 16));\n  }\n  if (/^#\\d+$/.test(entity)) {\n    return String.fromCodePoint(parseInt(entity.slice(1), 10));\n  }\n  return match;\n}\n"]} |
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