1 | (function (factory) {
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2 | if (typeof module === "object" && typeof module.exports === "object") {
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3 | var v = factory(require, exports);
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4 | if (v !== undefined) module.exports = v;
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5 | }
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6 | else if (typeof define === "function" && define.amd) {
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7 | define("@angular/compiler-cli/ngcc/src/dependencies/esm_dependency_host", ["require", "exports", "tslib", "typescript", "@angular/compiler-cli/ngcc/src/dependencies/dependency_host"], factory);
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8 | }
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9 | })(function (require, exports) {
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10 | "use strict";
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11 | Object.defineProperty(exports, "__esModule", { value: true });
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12 | exports.isStringImportOrReexport = exports.hasImportOrReexportStatements = exports.EsmDependencyHost = void 0;
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13 | var tslib_1 = require("tslib");
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14 | /**
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15 | * @license
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16 | * Copyright Google LLC All Rights Reserved.
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17 | *
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18 | * Use of this source code is governed by an MIT-style license that can be
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19 | * found in the LICENSE file at https://angular.io/license
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20 | */
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21 | var ts = require("typescript");
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22 | var dependency_host_1 = require("@angular/compiler-cli/ngcc/src/dependencies/dependency_host");
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23 | /**
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24 | * Helper functions for computing dependencies.
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25 | */
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26 | var EsmDependencyHost = /** @class */ (function (_super) {
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27 | tslib_1.__extends(EsmDependencyHost, _super);
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28 | function EsmDependencyHost(fs, moduleResolver, scanImportExpressions) {
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29 | if (scanImportExpressions === void 0) { scanImportExpressions = true; }
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30 | var _this = _super.call(this, fs, moduleResolver) || this;
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31 | _this.scanImportExpressions = scanImportExpressions;
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32 | // By skipping trivia here we don't have to account for it in the processing below
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33 | // It has no relevance to capturing imports.
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34 | _this.scanner = ts.createScanner(ts.ScriptTarget.Latest, /* skipTrivia */ true);
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35 | return _this;
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36 | }
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37 | EsmDependencyHost.prototype.canSkipFile = function (fileContents) {
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38 | return !hasImportOrReexportStatements(fileContents);
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39 | };
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40 | /**
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41 | * Extract any import paths from imports found in the contents of this file.
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42 | *
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43 | * This implementation uses the TypeScript scanner, which tokenizes source code,
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44 | * to process the string. This is halfway between working with the string directly,
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45 | * which is too difficult due to corner cases, and parsing the string into a full
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46 | * TypeScript Abstract Syntax Tree (AST), which ends up doing more processing than
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47 | * is needed.
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48 | *
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49 | * The scanning is not trivial because we must hold state between each token since
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50 | * the context of the token affects how it should be scanned, and the scanner does
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51 | * not manage this for us.
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52 | *
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53 | * Specifically, backticked strings are particularly challenging since it is possible
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54 | * to recursively nest backticks and TypeScript expressions within each other.
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55 | */
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56 | EsmDependencyHost.prototype.extractImports = function (file, fileContents) {
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57 | var imports = new Set();
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58 | var templateStack = [];
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59 | var lastToken = ts.SyntaxKind.Unknown;
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60 | var currentToken = ts.SyntaxKind.Unknown;
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61 | var stopAtIndex = findLastPossibleImportOrReexport(fileContents);
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62 | this.scanner.setText(fileContents);
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63 | while ((currentToken = this.scanner.scan()) !== ts.SyntaxKind.EndOfFileToken) {
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64 | if (this.scanner.getTokenPos() > stopAtIndex) {
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65 | break;
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66 | }
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67 | switch (currentToken) {
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68 | case ts.SyntaxKind.TemplateHead:
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69 | // TemplateHead indicates the beginning of a backticked string
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70 | // Capture this in the `templateStack` to indicate we are currently processing
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71 | // within the static text part of a backticked string.
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72 | templateStack.push(currentToken);
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73 | break;
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74 | case ts.SyntaxKind.OpenBraceToken:
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75 | if (templateStack.length > 0) {
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76 | // We are processing a backticked string. This indicates that we are either
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77 | // entering an interpolation expression or entering an object literal expression.
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78 | // We add it to the `templateStack` so we can track when we leave the interpolation or
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79 | // object literal.
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80 | templateStack.push(currentToken);
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81 | }
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82 | break;
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83 | case ts.SyntaxKind.CloseBraceToken:
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84 | if (templateStack.length > 0) {
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85 | // We are processing a backticked string then this indicates that we are either
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86 | // leaving an interpolation expression or leaving an object literal expression.
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87 | var templateToken = templateStack[templateStack.length - 1];
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88 | if (templateToken === ts.SyntaxKind.TemplateHead) {
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89 | // We have hit a nested backticked string so we need to rescan it in that context
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90 | currentToken = this.scanner.reScanTemplateToken(/* isTaggedTemplate */ false);
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91 | if (currentToken === ts.SyntaxKind.TemplateTail) {
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92 | // We got to the end of the backticked string so pop the token that started it off
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93 | // the stack.
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94 | templateStack.pop();
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95 | }
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96 | }
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97 | else {
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98 | // We hit the end of an object-literal expression so pop the open-brace that started
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99 | // it off the stack.
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100 | templateStack.pop();
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101 | }
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102 | }
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103 | break;
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104 | case ts.SyntaxKind.SlashToken:
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105 | case ts.SyntaxKind.SlashEqualsToken:
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106 | if (canPrecedeARegex(lastToken)) {
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107 | // We have hit a slash (`/`) in a context where it could be the start of a regular
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108 | // expression so rescan it in that context
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109 | currentToken = this.scanner.reScanSlashToken();
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110 | }
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111 | break;
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112 | case ts.SyntaxKind.ImportKeyword:
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113 | var importPath = this.extractImportPath();
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114 | if (importPath !== null) {
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115 | imports.add(importPath);
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116 | }
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117 | break;
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118 | case ts.SyntaxKind.ExportKeyword:
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119 | var reexportPath = this.extractReexportPath();
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120 | if (reexportPath !== null) {
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121 | imports.add(reexportPath);
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122 | }
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123 | break;
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124 | }
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125 | lastToken = currentToken;
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126 | }
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127 | // Clear the text from the scanner to avoid holding on to potentially large strings of source
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128 | // content after the scanning has completed.
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129 | this.scanner.setText('');
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130 | return imports;
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131 | };
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132 | /**
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133 | * We have found an `import` token so now try to identify the import path.
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134 | *
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135 | * This method will use the current state of `this.scanner` to extract a string literal module
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136 | * specifier. It expects that the current state of the scanner is that an `import` token has just
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137 | * been scanned.
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138 | *
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139 | * The following forms of import are matched:
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140 | *
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141 | * * `import "module-specifier";`
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142 | * * `import("module-specifier")`
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143 | * * `import defaultBinding from "module-specifier";`
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144 | * * `import defaultBinding, * as identifier from "module-specifier";`
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145 | * * `import defaultBinding, {...} from "module-specifier";`
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146 | * * `import * as identifier from "module-specifier";`
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147 | * * `import {...} from "module-specifier";`
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148 | *
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149 | * @returns the import path or null if there is no import or it is not a string literal.
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150 | */
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151 | EsmDependencyHost.prototype.extractImportPath = function () {
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152 | // Check for side-effect import
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153 | var sideEffectImportPath = this.tryStringLiteral();
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154 | if (sideEffectImportPath !== null) {
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155 | return sideEffectImportPath;
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156 | }
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157 | var kind = this.scanner.getToken();
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158 | // Check for dynamic import expression
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159 | if (kind === ts.SyntaxKind.OpenParenToken) {
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160 | return this.scanImportExpressions ? this.tryStringLiteral() : null;
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161 | }
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162 | // Check for defaultBinding
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163 | if (kind === ts.SyntaxKind.Identifier) {
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164 | // Skip default binding
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165 | kind = this.scanner.scan();
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166 | if (kind === ts.SyntaxKind.CommaToken) {
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167 | // Skip comma that indicates additional import bindings
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168 | kind = this.scanner.scan();
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169 | }
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170 | }
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171 | // Check for namespace import clause
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172 | if (kind === ts.SyntaxKind.AsteriskToken) {
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173 | kind = this.skipNamespacedClause();
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174 | if (kind === null) {
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175 | return null;
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176 | }
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177 | }
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178 | // Check for named imports clause
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179 | else if (kind === ts.SyntaxKind.OpenBraceToken) {
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180 | kind = this.skipNamedClause();
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181 | }
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182 | // Expect a `from` clause, if not bail out
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183 | if (kind !== ts.SyntaxKind.FromKeyword) {
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184 | return null;
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185 | }
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186 | return this.tryStringLiteral();
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187 | };
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188 | /**
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189 | * We have found an `export` token so now try to identify a re-export path.
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190 | *
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191 | * This method will use the current state of `this.scanner` to extract a string literal module
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192 | * specifier. It expects that the current state of the scanner is that an `export` token has
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193 | * just been scanned.
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194 | *
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195 | * There are three forms of re-export that are matched:
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196 | *
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197 | * * `export * from '...';
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198 | * * `export * as alias from '...';
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199 | * * `export {...} from '...';
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200 | */
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201 | EsmDependencyHost.prototype.extractReexportPath = function () {
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202 | // Skip the `export` keyword
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203 | var token = this.scanner.scan();
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204 | if (token === ts.SyntaxKind.AsteriskToken) {
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205 | token = this.skipNamespacedClause();
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206 | if (token === null) {
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207 | return null;
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208 | }
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209 | }
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210 | else if (token === ts.SyntaxKind.OpenBraceToken) {
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211 | token = this.skipNamedClause();
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212 | }
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213 | // Expect a `from` clause, if not bail out
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214 | if (token !== ts.SyntaxKind.FromKeyword) {
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215 | return null;
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216 | }
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217 | return this.tryStringLiteral();
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218 | };
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219 | EsmDependencyHost.prototype.skipNamespacedClause = function () {
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220 | // Skip past the `*`
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221 | var token = this.scanner.scan();
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222 | // Check for a `* as identifier` alias clause
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223 | if (token === ts.SyntaxKind.AsKeyword) {
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224 | // Skip past the `as` keyword
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225 | token = this.scanner.scan();
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226 | // Expect an identifier, if not bail out
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227 | if (token !== ts.SyntaxKind.Identifier) {
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228 | return null;
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229 | }
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230 | // Skip past the identifier
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231 | token = this.scanner.scan();
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232 | }
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233 | return token;
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234 | };
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235 | EsmDependencyHost.prototype.skipNamedClause = function () {
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236 | var braceCount = 1;
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237 | // Skip past the initial opening brace `{`
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238 | var token = this.scanner.scan();
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239 | // Search for the matching closing brace `}`
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240 | while (braceCount > 0 && token !== ts.SyntaxKind.EndOfFileToken) {
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241 | if (token === ts.SyntaxKind.OpenBraceToken) {
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242 | braceCount++;
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243 | }
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244 | else if (token === ts.SyntaxKind.CloseBraceToken) {
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245 | braceCount--;
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246 | }
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247 | token = this.scanner.scan();
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248 | }
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249 | return token;
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250 | };
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251 | EsmDependencyHost.prototype.tryStringLiteral = function () {
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252 | return this.scanner.scan() === ts.SyntaxKind.StringLiteral ? this.scanner.getTokenValue() :
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253 | null;
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254 | };
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255 | return EsmDependencyHost;
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256 | }(dependency_host_1.DependencyHostBase));
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257 | exports.EsmDependencyHost = EsmDependencyHost;
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258 | /**
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259 | * Check whether a source file needs to be parsed for imports.
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260 | * This is a performance short-circuit, which saves us from creating
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261 | * a TypeScript AST unnecessarily.
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262 | *
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263 | * @param source The content of the source file to check.
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264 | *
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265 | * @returns false if there are definitely no import or re-export statements
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266 | * in this file, true otherwise.
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267 | */
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268 | function hasImportOrReexportStatements(source) {
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269 | return /(?:import|export)[\s\S]+?(["'])(?:\\\1|.)+?\1/.test(source);
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270 | }
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271 | exports.hasImportOrReexportStatements = hasImportOrReexportStatements;
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272 | function findLastPossibleImportOrReexport(source) {
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273 | return Math.max(source.lastIndexOf('import'), source.lastIndexOf(' from '));
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274 | }
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275 | /**
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276 | * Check whether the given statement is an import with a string literal module specifier.
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277 | * @param stmt the statement node to check.
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278 | * @returns true if the statement is an import with a string literal module specifier.
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279 | */
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280 | function isStringImportOrReexport(stmt) {
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281 | return ts.isImportDeclaration(stmt) ||
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282 | ts.isExportDeclaration(stmt) && !!stmt.moduleSpecifier &&
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283 | ts.isStringLiteral(stmt.moduleSpecifier);
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284 | }
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285 | exports.isStringImportOrReexport = isStringImportOrReexport;
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286 | function canPrecedeARegex(kind) {
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287 | switch (kind) {
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288 | case ts.SyntaxKind.Identifier:
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289 | case ts.SyntaxKind.StringLiteral:
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290 | case ts.SyntaxKind.NumericLiteral:
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291 | case ts.SyntaxKind.BigIntLiteral:
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292 | case ts.SyntaxKind.RegularExpressionLiteral:
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293 | case ts.SyntaxKind.ThisKeyword:
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294 | case ts.SyntaxKind.PlusPlusToken:
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295 | case ts.SyntaxKind.MinusMinusToken:
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296 | case ts.SyntaxKind.CloseParenToken:
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297 | case ts.SyntaxKind.CloseBracketToken:
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298 | case ts.SyntaxKind.CloseBraceToken:
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299 | case ts.SyntaxKind.TrueKeyword:
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300 | case ts.SyntaxKind.FalseKeyword:
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301 | return false;
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302 | default:
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303 | return true;
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304 | }
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305 | }
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306 | });
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307 | //# 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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 */\nimport * as ts from 'typescript';\nimport {AbsoluteFsPath, ReadonlyFileSystem} from '../../../src/ngtsc/file_system';\nimport {DependencyHostBase} from './dependency_host';\nimport {ModuleResolver} from './module_resolver';\n\n/**\n * Helper functions for computing dependencies.\n */\nexport class EsmDependencyHost extends DependencyHostBase {\n  constructor(\n      fs: ReadonlyFileSystem, moduleResolver: ModuleResolver,\n      private scanImportExpressions = true) {\n    super(fs, moduleResolver);\n  }\n  // By skipping trivia here we don't have to account for it in the processing below\n  // It has no relevance to capturing imports.\n  private scanner = ts.createScanner(ts.ScriptTarget.Latest, /* skipTrivia */ true);\n\n  protected override canSkipFile(fileContents: string): boolean {\n    return !hasImportOrReexportStatements(fileContents);\n  }\n\n  /**\n   * Extract any import paths from imports found in the contents of this file.\n   *\n   * This implementation uses the TypeScript scanner, which tokenizes source code,\n   * to process the string. This is halfway between working with the string directly,\n   * which is too difficult due to corner cases, and parsing the string into a full\n   * TypeScript Abstract Syntax Tree (AST), which ends up doing more processing than\n   * is needed.\n   *\n   * The scanning is not trivial because we must hold state between each token since\n   * the context of the token affects how it should be scanned, and the scanner does\n   * not manage this for us.\n   *\n   * Specifically, backticked strings are particularly challenging since it is possible\n   * to recursively nest backticks and TypeScript expressions within each other.\n   */\n  protected override extractImports(file: AbsoluteFsPath, fileContents: string): Set<string> {\n    const imports = new Set<string>();\n    const templateStack: ts.SyntaxKind[] = [];\n    let lastToken: ts.SyntaxKind = ts.SyntaxKind.Unknown;\n    let currentToken: ts.SyntaxKind = ts.SyntaxKind.Unknown;\n    const stopAtIndex = findLastPossibleImportOrReexport(fileContents);\n\n    this.scanner.setText(fileContents);\n\n    while ((currentToken = this.scanner.scan()) !== ts.SyntaxKind.EndOfFileToken) {\n      if (this.scanner.getTokenPos() > stopAtIndex) {\n        break;\n      }\n      switch (currentToken) {\n        case ts.SyntaxKind.TemplateHead:\n          // TemplateHead indicates the beginning of a backticked string\n          // Capture this in the `templateStack` to indicate we are currently processing\n          // within the static text part of a backticked string.\n          templateStack.push(currentToken);\n          break;\n        case ts.SyntaxKind.OpenBraceToken:\n          if (templateStack.length > 0) {\n            // We are processing a backticked string. This indicates that we are either\n            // entering an interpolation expression or entering an object literal expression.\n            // We add it to the `templateStack` so we can track when we leave the interpolation or\n            // object literal.\n            templateStack.push(currentToken);\n          }\n          break;\n        case ts.SyntaxKind.CloseBraceToken:\n          if (templateStack.length > 0) {\n            // We are processing a backticked string then this indicates that we are either\n            // leaving an interpolation expression or leaving an object literal expression.\n            const templateToken = templateStack[templateStack.length - 1];\n            if (templateToken === ts.SyntaxKind.TemplateHead) {\n              // We have hit a nested backticked string so we need to rescan it in that context\n              currentToken = this.scanner.reScanTemplateToken(/* isTaggedTemplate */ false);\n              if (currentToken === ts.SyntaxKind.TemplateTail) {\n                // We got to the end of the backticked string so pop the token that started it off\n                // the stack.\n                templateStack.pop();\n              }\n            } else {\n              // We hit the end of an object-literal expression so pop the open-brace that started\n              // it off the stack.\n              templateStack.pop();\n            }\n          }\n          break;\n        case ts.SyntaxKind.SlashToken:\n        case ts.SyntaxKind.SlashEqualsToken:\n          if (canPrecedeARegex(lastToken)) {\n            // We have hit a slash (`/`) in a context where it could be the start of a regular\n            // expression so rescan it in that context\n            currentToken = this.scanner.reScanSlashToken();\n          }\n          break;\n        case ts.SyntaxKind.ImportKeyword:\n          const importPath = this.extractImportPath();\n          if (importPath !== null) {\n            imports.add(importPath);\n          }\n          break;\n        case ts.SyntaxKind.ExportKeyword:\n          const reexportPath = this.extractReexportPath();\n          if (reexportPath !== null) {\n            imports.add(reexportPath);\n          }\n          break;\n      }\n      lastToken = currentToken;\n    }\n\n    // Clear the text from the scanner to avoid holding on to potentially large strings of source\n    // content after the scanning has completed.\n    this.scanner.setText('');\n\n    return imports;\n  }\n\n\n  /**\n   * We have found an `import` token so now try to identify the import path.\n   *\n   * This method will use the current state of `this.scanner` to extract a string literal module\n   * specifier. It expects that the current state of the scanner is that an `import` token has just\n   * been scanned.\n   *\n   * The following forms of import are matched:\n   *\n   * * `import \"module-specifier\";`\n   * * `import(\"module-specifier\")`\n   * * `import defaultBinding from \"module-specifier\";`\n   * * `import defaultBinding, * as identifier from \"module-specifier\";`\n   * * `import defaultBinding, {...} from \"module-specifier\";`\n   * * `import * as identifier from \"module-specifier\";`\n   * * `import {...} from \"module-specifier\";`\n   *\n   * @returns the import path or null if there is no import or it is not a string literal.\n   */\n  protected extractImportPath(): string|null {\n    // Check for side-effect import\n    let sideEffectImportPath = this.tryStringLiteral();\n    if (sideEffectImportPath !== null) {\n      return sideEffectImportPath;\n    }\n\n    let kind: ts.SyntaxKind|null = this.scanner.getToken();\n\n    // Check for dynamic import expression\n    if (kind === ts.SyntaxKind.OpenParenToken) {\n      return this.scanImportExpressions ? this.tryStringLiteral() : null;\n    }\n\n    // Check for defaultBinding\n    if (kind === ts.SyntaxKind.Identifier) {\n      // Skip default binding\n      kind = this.scanner.scan();\n      if (kind === ts.SyntaxKind.CommaToken) {\n        // Skip comma that indicates additional import bindings\n        kind = this.scanner.scan();\n      }\n    }\n\n    // Check for namespace import clause\n    if (kind === ts.SyntaxKind.AsteriskToken) {\n      kind = this.skipNamespacedClause();\n      if (kind === null) {\n        return null;\n      }\n    }\n    // Check for named imports clause\n    else if (kind === ts.SyntaxKind.OpenBraceToken) {\n      kind = this.skipNamedClause();\n    }\n\n    // Expect a `from` clause, if not bail out\n    if (kind !== ts.SyntaxKind.FromKeyword) {\n      return null;\n    }\n\n    return this.tryStringLiteral();\n  }\n\n  /**\n   * We have found an `export` token so now try to identify a re-export path.\n   *\n   * This method will use the current state of `this.scanner` to extract a string literal module\n   * specifier. It expects that the current state of the scanner is that an `export` token has\n   * just been scanned.\n   *\n   * There are three forms of re-export that are matched:\n   *\n   * * `export * from '...';\n   * * `export * as alias from '...';\n   * * `export {...} from '...';\n   */\n  protected extractReexportPath(): string|null {\n    // Skip the `export` keyword\n    let token: ts.SyntaxKind|null = this.scanner.scan();\n    if (token === ts.SyntaxKind.AsteriskToken) {\n      token = this.skipNamespacedClause();\n      if (token === null) {\n        return null;\n      }\n    } else if (token === ts.SyntaxKind.OpenBraceToken) {\n      token = this.skipNamedClause();\n    }\n    // Expect a `from` clause, if not bail out\n    if (token !== ts.SyntaxKind.FromKeyword) {\n      return null;\n    }\n    return this.tryStringLiteral();\n  }\n\n  protected skipNamespacedClause(): ts.SyntaxKind|null {\n    // Skip past the `*`\n    let token = this.scanner.scan();\n    // Check for a `* as identifier` alias clause\n    if (token === ts.SyntaxKind.AsKeyword) {\n      // Skip past the `as` keyword\n      token = this.scanner.scan();\n      // Expect an identifier, if not bail out\n      if (token !== ts.SyntaxKind.Identifier) {\n        return null;\n      }\n      // Skip past the identifier\n      token = this.scanner.scan();\n    }\n    return token;\n  }\n\n  protected skipNamedClause(): ts.SyntaxKind {\n    let braceCount = 1;\n    // Skip past the initial opening brace `{`\n    let token = this.scanner.scan();\n    // Search for the matching closing brace `}`\n    while (braceCount > 0 && token !== ts.SyntaxKind.EndOfFileToken) {\n      if (token === ts.SyntaxKind.OpenBraceToken) {\n        braceCount++;\n      } else if (token === ts.SyntaxKind.CloseBraceToken) {\n        braceCount--;\n      }\n      token = this.scanner.scan();\n    }\n    return token;\n  }\n\n  protected tryStringLiteral(): string|null {\n    return this.scanner.scan() === ts.SyntaxKind.StringLiteral ? this.scanner.getTokenValue() :\n                                                                 null;\n  }\n}\n\n/**\n * Check whether a source file needs to be parsed for imports.\n * This is a performance short-circuit, which saves us from creating\n * a TypeScript AST unnecessarily.\n *\n * @param source The content of the source file to check.\n *\n * @returns false if there are definitely no import or re-export statements\n * in this file, true otherwise.\n */\nexport function hasImportOrReexportStatements(source: string): boolean {\n  return /(?:import|export)[\\s\\S]+?([\"'])(?:\\\\\\1|.)+?\\1/.test(source);\n}\n\nfunction findLastPossibleImportOrReexport(source: string): number {\n  return Math.max(source.lastIndexOf('import'), source.lastIndexOf(' from '));\n}\n\n/**\n * Check whether the given statement is an import with a string literal module specifier.\n * @param stmt the statement node to check.\n * @returns true if the statement is an import with a string literal module specifier.\n */\nexport function isStringImportOrReexport(stmt: ts.Statement): stmt is ts.ImportDeclaration&\n    {moduleSpecifier: ts.StringLiteral} {\n  return ts.isImportDeclaration(stmt) ||\n      ts.isExportDeclaration(stmt) && !!stmt.moduleSpecifier &&\n      ts.isStringLiteral(stmt.moduleSpecifier);\n}\n\n\nfunction canPrecedeARegex(kind: ts.SyntaxKind): boolean {\n  switch (kind) {\n    case ts.SyntaxKind.Identifier:\n    case ts.SyntaxKind.StringLiteral:\n    case ts.SyntaxKind.NumericLiteral:\n    case ts.SyntaxKind.BigIntLiteral:\n    case ts.SyntaxKind.RegularExpressionLiteral:\n    case ts.SyntaxKind.ThisKeyword:\n    case ts.SyntaxKind.PlusPlusToken:\n    case ts.SyntaxKind.MinusMinusToken:\n    case ts.SyntaxKind.CloseParenToken:\n    case ts.SyntaxKind.CloseBracketToken:\n    case ts.SyntaxKind.CloseBraceToken:\n    case ts.SyntaxKind.TrueKeyword:\n    case ts.SyntaxKind.FalseKeyword:\n      return false;\n    default:\n      return true;\n  }\n}\n"]} |
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