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 | (function (factory) {
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9 | if (typeof module === "object" && typeof module.exports === "object") {
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10 | var v = factory(require, exports);
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11 | if (v !== undefined) module.exports = v;
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12 | }
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13 | else if (typeof define === "function" && define.amd) {
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14 | define("@angular/compiler-cli/src/transformers/lower_expressions", ["require", "exports", "tslib", "@angular/compiler", "typescript", "@angular/compiler-cli/src/metadata/index"], factory);
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15 | }
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16 | })(function (require, exports) {
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17 | "use strict";
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18 | Object.defineProperty(exports, "__esModule", { value: true });
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19 | exports.LowerMetadataTransform = exports.getExpressionLoweringTransformFactory = void 0;
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20 | var tslib_1 = require("tslib");
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21 | var compiler_1 = require("@angular/compiler");
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22 | var ts = require("typescript");
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23 | var index_1 = require("@angular/compiler-cli/src/metadata/index");
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24 | function toMap(items, select) {
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25 | return new Map(items.map(function (i) { return [select(i), i]; }));
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26 | }
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27 | // We will never lower expressions in a nested lexical scope so avoid entering them.
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28 | // This also avoids a bug in TypeScript 2.3 where the lexical scopes get out of sync
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29 | // when using visitEachChild.
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30 | function isLexicalScope(node) {
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31 | switch (node.kind) {
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32 | case ts.SyntaxKind.ArrowFunction:
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33 | case ts.SyntaxKind.FunctionExpression:
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34 | case ts.SyntaxKind.FunctionDeclaration:
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35 | case ts.SyntaxKind.ClassExpression:
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36 | case ts.SyntaxKind.ClassDeclaration:
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37 | case ts.SyntaxKind.FunctionType:
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38 | case ts.SyntaxKind.TypeLiteral:
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39 | case ts.SyntaxKind.ArrayType:
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40 | return true;
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41 | }
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42 | return false;
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43 | }
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44 | function transformSourceFile(sourceFile, requests, context) {
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45 | var inserts = [];
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46 | // Calculate the range of interesting locations. The transform will only visit nodes in this
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47 | // range to improve the performance on large files.
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48 | var locations = Array.from(requests.keys());
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49 | var min = Math.min.apply(Math, tslib_1.__spreadArray([], tslib_1.__read(locations)));
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50 | var max = Math.max.apply(Math, tslib_1.__spreadArray([], tslib_1.__read(locations)));
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51 | // Visit nodes matching the request and synthetic nodes added by tsickle
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52 | function shouldVisit(pos, end) {
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53 | return (pos <= max && end >= min) || pos == -1;
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54 | }
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55 | function visitSourceFile(sourceFile) {
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56 | function topLevelStatement(node) {
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57 | var declarations = [];
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58 | function visitNode(node) {
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59 | // Get the original node before tsickle
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60 | var _a = ts.getOriginalNode(node), pos = _a.pos, end = _a.end, kind = _a.kind, originalParent = _a.parent;
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61 | var nodeRequest = requests.get(pos);
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62 | if (nodeRequest && nodeRequest.kind == kind && nodeRequest.end == end) {
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63 | // This node is requested to be rewritten as a reference to the exported name.
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64 | if (originalParent && originalParent.kind === ts.SyntaxKind.VariableDeclaration) {
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65 | // As the value represents the whole initializer of a variable declaration,
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66 | // just refer to that variable. This e.g. helps to preserve closure comments
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67 | // at the right place.
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68 | var varParent = originalParent;
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69 | if (varParent.name.kind === ts.SyntaxKind.Identifier) {
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70 | var varName = varParent.name.text;
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71 | var exportName_1 = nodeRequest.name;
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72 | declarations.push({
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73 | name: exportName_1,
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74 | node: ts.createIdentifier(varName),
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75 | order: 1 /* AfterStmt */
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76 | });
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77 | return node;
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78 | }
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79 | }
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80 | // Record that the node needs to be moved to an exported variable with the given name
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81 | var exportName = nodeRequest.name;
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82 | declarations.push({ name: exportName, node: node, order: 0 /* BeforeStmt */ });
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83 | return ts.createIdentifier(exportName);
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84 | }
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85 | var result = node;
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86 | if (shouldVisit(pos, end) && !isLexicalScope(node)) {
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87 | result = ts.visitEachChild(node, visitNode, context);
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88 | }
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89 | return result;
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90 | }
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91 | // Get the original node before tsickle
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92 | var _a = ts.getOriginalNode(node), pos = _a.pos, end = _a.end;
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93 | var resultStmt;
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94 | if (shouldVisit(pos, end)) {
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95 | resultStmt = ts.visitEachChild(node, visitNode, context);
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96 | }
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97 | else {
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98 | resultStmt = node;
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99 | }
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100 | if (declarations.length) {
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101 | inserts.push({ relativeTo: resultStmt, declarations: declarations });
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102 | }
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103 | return resultStmt;
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104 | }
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105 | var newStatements = sourceFile.statements.map(topLevelStatement);
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106 | if (inserts.length) {
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107 | // Insert the declarations relative to the rewritten statement that references them.
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108 | var insertMap_1 = toMap(inserts, function (i) { return i.relativeTo; });
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109 | var tmpStatements_1 = [];
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110 | newStatements.forEach(function (statement) {
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111 | var insert = insertMap_1.get(statement);
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112 | if (insert) {
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113 | var before = insert.declarations.filter(function (d) { return d.order === 0 /* BeforeStmt */; });
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114 | if (before.length) {
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115 | tmpStatements_1.push(createVariableStatementForDeclarations(before));
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116 | }
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117 | tmpStatements_1.push(statement);
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118 | var after = insert.declarations.filter(function (d) { return d.order === 1 /* AfterStmt */; });
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119 | if (after.length) {
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120 | tmpStatements_1.push(createVariableStatementForDeclarations(after));
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121 | }
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122 | }
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123 | else {
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124 | tmpStatements_1.push(statement);
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125 | }
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126 | });
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127 | // Insert an exports clause to export the declarations
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128 | tmpStatements_1.push(ts.createExportDeclaration(
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129 | /* decorators */ undefined,
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130 | /* modifiers */ undefined, ts.createNamedExports(inserts
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131 | .reduce(function (accumulator, insert) { return tslib_1.__spreadArray(tslib_1.__spreadArray([], tslib_1.__read(accumulator)), tslib_1.__read(insert.declarations)); }, [])
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132 | .map(function (declaration) { return ts.createExportSpecifier(
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133 | /* propertyName */ undefined, declaration.name); }))));
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134 | newStatements = tmpStatements_1;
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135 | }
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136 | var newSf = ts.updateSourceFileNode(sourceFile, ts.setTextRange(ts.createNodeArray(newStatements), sourceFile.statements));
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137 | if (!(sourceFile.flags & ts.NodeFlags.Synthesized)) {
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138 | newSf.flags &= ~ts.NodeFlags.Synthesized;
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139 | }
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140 | return newSf;
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141 | }
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142 | return visitSourceFile(sourceFile);
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143 | }
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144 | function createVariableStatementForDeclarations(declarations) {
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145 | var varDecls = declarations.map(function (i) { return ts.createVariableDeclaration(i.name, /* type */ undefined, i.node); });
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146 | return ts.createVariableStatement(
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147 | /* modifiers */ undefined, ts.createVariableDeclarationList(varDecls, ts.NodeFlags.Const));
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148 | }
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149 | function getExpressionLoweringTransformFactory(requestsMap, program) {
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150 | // Return the factory
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151 | return function (context) { return function (sourceFile) {
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152 | // We need to use the original SourceFile for reading metadata, and not the transformed one.
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153 | var originalFile = program.getSourceFile(sourceFile.fileName);
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154 | if (originalFile) {
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155 | var requests = requestsMap.getRequests(originalFile);
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156 | if (requests && requests.size) {
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157 | return transformSourceFile(sourceFile, requests, context);
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158 | }
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159 | }
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160 | return sourceFile;
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161 | }; };
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162 | }
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163 | exports.getExpressionLoweringTransformFactory = getExpressionLoweringTransformFactory;
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164 | function isEligibleForLowering(node) {
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165 | if (node) {
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166 | switch (node.kind) {
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167 | case ts.SyntaxKind.SourceFile:
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168 | case ts.SyntaxKind.Decorator:
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169 | // Lower expressions that are local to the module scope or
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170 | // in a decorator.
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171 | return true;
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172 | case ts.SyntaxKind.ClassDeclaration:
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173 | case ts.SyntaxKind.InterfaceDeclaration:
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174 | case ts.SyntaxKind.EnumDeclaration:
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175 | case ts.SyntaxKind.FunctionDeclaration:
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176 | // Don't lower expressions in a declaration.
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177 | return false;
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178 | case ts.SyntaxKind.VariableDeclaration:
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179 | var isExported = (ts.getCombinedModifierFlags(node) &
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180 | ts.ModifierFlags.Export) == 0;
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181 | // This might be unnecessary, as the variable might be exported and only used as a reference
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182 | // in another expression. However, the variable also might be involved in provider
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183 | // definitions. If that's the case, there is a specific token (`ROUTES`) which the compiler
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184 | // attempts to understand deeply. Sub-expressions within that token (`loadChildren` for
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185 | // example) might also require lowering even if the top-level declaration is already
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186 | // properly exported.
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187 | var varNode = node;
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188 | return isExported ||
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189 | (varNode.initializer !== undefined &&
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190 | (ts.isObjectLiteralExpression(varNode.initializer) ||
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191 | ts.isArrayLiteralExpression(varNode.initializer) ||
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192 | ts.isCallExpression(varNode.initializer)));
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193 | }
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194 | return isEligibleForLowering(node.parent);
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195 | }
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196 | return true;
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197 | }
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198 | function isPrimitive(value) {
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199 | return Object(value) !== value;
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200 | }
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201 | function isRewritten(value) {
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202 | return index_1.isMetadataGlobalReferenceExpression(value) && compiler_1.isLoweredSymbol(value.name);
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203 | }
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204 | function isLiteralFieldNamed(node, names) {
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205 | if (node.parent && node.parent.kind == ts.SyntaxKind.PropertyAssignment) {
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206 | var property = node.parent;
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207 | if (property.parent && property.parent.kind == ts.SyntaxKind.ObjectLiteralExpression &&
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208 | property.name && property.name.kind == ts.SyntaxKind.Identifier) {
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209 | var propertyName = property.name;
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210 | return names.has(propertyName.text);
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211 | }
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212 | }
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213 | return false;
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214 | }
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215 | var LowerMetadataTransform = /** @class */ (function () {
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216 | function LowerMetadataTransform(lowerableFieldNames) {
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217 | this.requests = new Map();
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218 | this.lowerableFieldNames = new Set(lowerableFieldNames);
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219 | }
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220 | // RequestMap
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221 | LowerMetadataTransform.prototype.getRequests = function (sourceFile) {
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222 | var result = this.requests.get(sourceFile.fileName);
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223 | if (!result) {
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224 | // Force the metadata for this source file to be collected which
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225 | // will recursively call start() populating the request map;
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226 | this.cache.getMetadata(sourceFile);
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227 | // If we still don't have the requested metadata, the file is not a module
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228 | // or is a declaration file so return an empty map.
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229 | result = this.requests.get(sourceFile.fileName) || new Map();
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230 | }
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231 | return result;
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232 | };
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233 | // MetadataTransformer
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234 | LowerMetadataTransform.prototype.connect = function (cache) {
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235 | this.cache = cache;
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236 | };
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237 | LowerMetadataTransform.prototype.start = function (sourceFile) {
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238 | var _this = this;
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239 | var identNumber = 0;
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240 | var freshIdent = function () { return compiler_1.createLoweredSymbol(identNumber++); };
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241 | var requests = new Map();
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242 | this.requests.set(sourceFile.fileName, requests);
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243 | var replaceNode = function (node) {
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244 | var name = freshIdent();
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245 | requests.set(node.pos, { name: name, kind: node.kind, location: node.pos, end: node.end });
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246 | return { __symbolic: 'reference', name: name };
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247 | };
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248 | var isExportedSymbol = (function () {
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249 | var exportTable;
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250 | return function (node) {
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251 | if (node.kind == ts.SyntaxKind.Identifier) {
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252 | var ident = node;
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253 | if (!exportTable) {
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254 | exportTable = createExportTableFor(sourceFile);
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255 | }
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256 | return exportTable.has(ident.text);
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257 | }
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258 | return false;
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259 | };
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260 | })();
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261 | var isExportedPropertyAccess = function (node) {
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262 | if (node.kind === ts.SyntaxKind.PropertyAccessExpression) {
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263 | var pae = node;
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264 | if (isExportedSymbol(pae.expression)) {
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265 | return true;
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266 | }
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267 | }
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268 | return false;
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269 | };
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270 | var hasLowerableParentCache = new Map();
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271 | var shouldBeLowered = function (node) {
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272 | if (node === undefined) {
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273 | return false;
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274 | }
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275 | var lowerable = false;
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276 | if ((node.kind === ts.SyntaxKind.ArrowFunction ||
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277 | node.kind === ts.SyntaxKind.FunctionExpression) &&
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278 | isEligibleForLowering(node)) {
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279 | lowerable = true;
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280 | }
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281 | else if (isLiteralFieldNamed(node, _this.lowerableFieldNames) && isEligibleForLowering(node) &&
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282 | !isExportedSymbol(node) && !isExportedPropertyAccess(node)) {
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283 | lowerable = true;
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284 | }
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285 | return lowerable;
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286 | };
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287 | var hasLowerableParent = function (node) {
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288 | if (node === undefined) {
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289 | return false;
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290 | }
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291 | if (!hasLowerableParentCache.has(node)) {
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292 | hasLowerableParentCache.set(node, shouldBeLowered(node.parent) || hasLowerableParent(node.parent));
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293 | }
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294 | return hasLowerableParentCache.get(node);
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295 | };
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296 | var isLowerable = function (node) {
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297 | if (node === undefined) {
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298 | return false;
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299 | }
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300 | return shouldBeLowered(node) && !hasLowerableParent(node);
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301 | };
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302 | return function (value, node) {
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303 | if (!isPrimitive(value) && !isRewritten(value) && isLowerable(node)) {
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304 | return replaceNode(node);
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305 | }
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306 | return value;
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307 | };
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308 | };
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309 | return LowerMetadataTransform;
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310 | }());
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311 | exports.LowerMetadataTransform = LowerMetadataTransform;
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312 | function createExportTableFor(sourceFile) {
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313 | var exportTable = new Set();
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314 | // Lazily collect all the exports from the source file
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315 | ts.forEachChild(sourceFile, function scan(node) {
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316 | var e_1, _a;
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317 | switch (node.kind) {
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318 | case ts.SyntaxKind.ClassDeclaration:
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319 | case ts.SyntaxKind.FunctionDeclaration:
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320 | case ts.SyntaxKind.InterfaceDeclaration:
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321 | if ((ts.getCombinedModifierFlags(node) & ts.ModifierFlags.Export) != 0) {
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322 | var classDeclaration = node;
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323 | var name = classDeclaration.name;
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324 | if (name)
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325 | exportTable.add(name.text);
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326 | }
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327 | break;
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328 | case ts.SyntaxKind.VariableStatement:
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329 | var variableStatement = node;
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330 | try {
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331 | for (var _b = tslib_1.__values(variableStatement.declarationList.declarations), _c = _b.next(); !_c.done; _c = _b.next()) {
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332 | var declaration = _c.value;
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333 | scan(declaration);
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334 | }
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335 | }
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336 | catch (e_1_1) { e_1 = { error: e_1_1 }; }
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337 | finally {
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338 | try {
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339 | if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
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340 | }
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341 | finally { if (e_1) throw e_1.error; }
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342 | }
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343 | break;
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344 | case ts.SyntaxKind.VariableDeclaration:
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345 | var variableDeclaration = node;
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346 | if ((ts.getCombinedModifierFlags(variableDeclaration) & ts.ModifierFlags.Export) != 0 &&
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347 | variableDeclaration.name.kind == ts.SyntaxKind.Identifier) {
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348 | var name = variableDeclaration.name;
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349 | exportTable.add(name.text);
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350 | }
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351 | break;
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352 | case ts.SyntaxKind.ExportDeclaration:
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353 | var exportDeclaration = node;
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354 | var moduleSpecifier = exportDeclaration.moduleSpecifier, exportClause = exportDeclaration.exportClause;
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355 | if (!moduleSpecifier && exportClause && ts.isNamedExports(exportClause)) {
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356 | exportClause.elements.forEach(function (spec) {
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357 | exportTable.add(spec.name.text);
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358 | });
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359 | }
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360 | }
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361 | });
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362 | return exportTable;
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363 | }
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364 | });
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365 | //# 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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 {createLoweredSymbol, isLoweredSymbol} from '@angular/compiler';\nimport * as ts from 'typescript';\n\nimport {CollectorOptions, isMetadataGlobalReferenceExpression, MetadataCollector, MetadataValue, ModuleMetadata} from '../metadata/index';\n\nimport {MetadataCache, MetadataTransformer, ValueTransform} from './metadata_cache';\n\nexport interface LoweringRequest {\n  kind: ts.SyntaxKind;\n  location: number;\n  end: number;\n  name: string;\n}\n\nexport type RequestLocationMap = Map<number, LoweringRequest>;\n\nconst enum DeclarationOrder {\n  BeforeStmt,\n  AfterStmt\n}\n\ninterface Declaration {\n  name: string;\n  node: ts.Node;\n  order: DeclarationOrder;\n}\n\ninterface DeclarationInsert {\n  declarations: Declaration[];\n  relativeTo: ts.Node;\n}\n\nfunction toMap<T, K>(items: T[], select: (item: T) => K): Map<K, T> {\n  return new Map(items.map<[K, T]>(i => [select(i), i]));\n}\n\n// We will never lower expressions in a nested lexical scope so avoid entering them.\n// This also avoids a bug in TypeScript 2.3 where the lexical scopes get out of sync\n// when using visitEachChild.\nfunction isLexicalScope(node: ts.Node): boolean {\n  switch (node.kind) {\n    case ts.SyntaxKind.ArrowFunction:\n    case ts.SyntaxKind.FunctionExpression:\n    case ts.SyntaxKind.FunctionDeclaration:\n    case ts.SyntaxKind.ClassExpression:\n    case ts.SyntaxKind.ClassDeclaration:\n    case ts.SyntaxKind.FunctionType:\n    case ts.SyntaxKind.TypeLiteral:\n    case ts.SyntaxKind.ArrayType:\n      return true;\n  }\n  return false;\n}\n\nfunction transformSourceFile(\n    sourceFile: ts.SourceFile, requests: RequestLocationMap,\n    context: ts.TransformationContext): ts.SourceFile {\n  const inserts: DeclarationInsert[] = [];\n\n  // Calculate the range of interesting locations. The transform will only visit nodes in this\n  // range to improve the performance on large files.\n  const locations = Array.from(requests.keys());\n  const min = Math.min(...locations);\n  const max = Math.max(...locations);\n\n  // Visit nodes matching the request and synthetic nodes added by tsickle\n  function shouldVisit(pos: number, end: number): boolean {\n    return (pos <= max && end >= min) || pos == -1;\n  }\n\n  function visitSourceFile(sourceFile: ts.SourceFile): ts.SourceFile {\n    function topLevelStatement(node: ts.Statement): ts.Statement {\n      const declarations: Declaration[] = [];\n\n      function visitNode(node: ts.Node): ts.Node {\n        // Get the original node before tsickle\n        const {pos, end, kind, parent: originalParent} = ts.getOriginalNode(node);\n        const nodeRequest = requests.get(pos);\n        if (nodeRequest && nodeRequest.kind == kind && nodeRequest.end == end) {\n          // This node is requested to be rewritten as a reference to the exported name.\n          if (originalParent && originalParent.kind === ts.SyntaxKind.VariableDeclaration) {\n            // As the value represents the whole initializer of a variable declaration,\n            // just refer to that variable. This e.g. helps to preserve closure comments\n            // at the right place.\n            const varParent = originalParent as ts.VariableDeclaration;\n            if (varParent.name.kind === ts.SyntaxKind.Identifier) {\n              const varName = varParent.name.text;\n              const exportName = nodeRequest.name;\n              declarations.push({\n                name: exportName,\n                node: ts.createIdentifier(varName),\n                order: DeclarationOrder.AfterStmt\n              });\n              return node;\n            }\n          }\n          // Record that the node needs to be moved to an exported variable with the given name\n          const exportName = nodeRequest.name;\n          declarations.push({name: exportName, node, order: DeclarationOrder.BeforeStmt});\n          return ts.createIdentifier(exportName);\n        }\n        let result = node;\n        if (shouldVisit(pos, end) && !isLexicalScope(node)) {\n          result = ts.visitEachChild(node, visitNode, context);\n        }\n        return result;\n      }\n\n      // Get the original node before tsickle\n      const {pos, end} = ts.getOriginalNode(node);\n      let resultStmt: ts.Statement;\n      if (shouldVisit(pos, end)) {\n        resultStmt = ts.visitEachChild(node, visitNode, context);\n      } else {\n        resultStmt = node;\n      }\n\n      if (declarations.length) {\n        inserts.push({relativeTo: resultStmt, declarations});\n      }\n      return resultStmt;\n    }\n\n    let newStatements = sourceFile.statements.map(topLevelStatement);\n\n    if (inserts.length) {\n      // Insert the declarations relative to the rewritten statement that references them.\n      const insertMap = toMap(inserts, i => i.relativeTo);\n      const tmpStatements: ts.Statement[] = [];\n      newStatements.forEach(statement => {\n        const insert = insertMap.get(statement);\n        if (insert) {\n          const before = insert.declarations.filter(d => d.order === DeclarationOrder.BeforeStmt);\n          if (before.length) {\n            tmpStatements.push(createVariableStatementForDeclarations(before));\n          }\n          tmpStatements.push(statement);\n          const after = insert.declarations.filter(d => d.order === DeclarationOrder.AfterStmt);\n          if (after.length) {\n            tmpStatements.push(createVariableStatementForDeclarations(after));\n          }\n        } else {\n          tmpStatements.push(statement);\n        }\n      });\n\n      // Insert an exports clause to export the declarations\n      tmpStatements.push(ts.createExportDeclaration(\n          /* decorators */ undefined,\n          /* modifiers */ undefined,\n          ts.createNamedExports(\n              inserts\n                  .reduce(\n                      (accumulator, insert) => [...accumulator, ...insert.declarations],\n                      [] as Declaration[])\n                  .map(\n                      declaration => ts.createExportSpecifier(\n                          /* propertyName */ undefined, declaration.name)))));\n\n      newStatements = tmpStatements;\n    }\n\n    const newSf = ts.updateSourceFileNode(\n        sourceFile, ts.setTextRange(ts.createNodeArray(newStatements), sourceFile.statements));\n    if (!(sourceFile.flags & ts.NodeFlags.Synthesized)) {\n      (newSf.flags as ts.NodeFlags) &= ~ts.NodeFlags.Synthesized;\n    }\n\n    return newSf;\n  }\n\n  return visitSourceFile(sourceFile);\n}\n\nfunction createVariableStatementForDeclarations(declarations: Declaration[]): ts.VariableStatement {\n  const varDecls = declarations.map(\n      i => ts.createVariableDeclaration(i.name, /* type */ undefined, i.node as ts.Expression));\n  return ts.createVariableStatement(\n      /* modifiers */ undefined, ts.createVariableDeclarationList(varDecls, ts.NodeFlags.Const));\n}\n\nexport function getExpressionLoweringTransformFactory(\n    requestsMap: RequestsMap, program: ts.Program): (context: ts.TransformationContext) =>\n    (sourceFile: ts.SourceFile) => ts.SourceFile {\n  // Return the factory\n  return (context: ts.TransformationContext) => (sourceFile: ts.SourceFile): ts.SourceFile => {\n    // We need to use the original SourceFile for reading metadata, and not the transformed one.\n    const originalFile = program.getSourceFile(sourceFile.fileName);\n    if (originalFile) {\n      const requests = requestsMap.getRequests(originalFile);\n      if (requests && requests.size) {\n        return transformSourceFile(sourceFile, requests, context);\n      }\n    }\n    return sourceFile;\n  };\n}\n\nexport interface RequestsMap {\n  getRequests(sourceFile: ts.SourceFile): RequestLocationMap;\n}\n\nfunction isEligibleForLowering(node: ts.Node|undefined): boolean {\n  if (node) {\n    switch (node.kind) {\n      case ts.SyntaxKind.SourceFile:\n      case ts.SyntaxKind.Decorator:\n        // Lower expressions that are local to the module scope or\n        // in a decorator.\n        return true;\n      case ts.SyntaxKind.ClassDeclaration:\n      case ts.SyntaxKind.InterfaceDeclaration:\n      case ts.SyntaxKind.EnumDeclaration:\n      case ts.SyntaxKind.FunctionDeclaration:\n        // Don't lower expressions in a declaration.\n        return false;\n      case ts.SyntaxKind.VariableDeclaration:\n        const isExported = (ts.getCombinedModifierFlags(node as ts.VariableDeclaration) &\n                            ts.ModifierFlags.Export) == 0;\n        // This might be unnecessary, as the variable might be exported and only used as a reference\n        // in another expression. However, the variable also might be involved in provider\n        // definitions. If that's the case, there is a specific token (`ROUTES`) which the compiler\n        // attempts to understand deeply. Sub-expressions within that token (`loadChildren` for\n        // example) might also require lowering even if the top-level declaration is already\n        // properly exported.\n        const varNode = node as ts.VariableDeclaration;\n        return isExported ||\n            (varNode.initializer !== undefined &&\n             (ts.isObjectLiteralExpression(varNode.initializer) ||\n              ts.isArrayLiteralExpression(varNode.initializer) ||\n              ts.isCallExpression(varNode.initializer)));\n    }\n    return isEligibleForLowering(node.parent);\n  }\n  return true;\n}\n\nfunction isPrimitive(value: any): boolean {\n  return Object(value) !== value;\n}\n\nfunction isRewritten(value: any): boolean {\n  return isMetadataGlobalReferenceExpression(value) && isLoweredSymbol(value.name);\n}\n\nfunction isLiteralFieldNamed(node: ts.Node, names: Set<string>): boolean {\n  if (node.parent && node.parent.kind == ts.SyntaxKind.PropertyAssignment) {\n    const property = node.parent as ts.PropertyAssignment;\n    if (property.parent && property.parent.kind == ts.SyntaxKind.ObjectLiteralExpression &&\n        property.name && property.name.kind == ts.SyntaxKind.Identifier) {\n      const propertyName = property.name as ts.Identifier;\n      return names.has(propertyName.text);\n    }\n  }\n  return false;\n}\n\nexport class LowerMetadataTransform implements RequestsMap, MetadataTransformer {\n  // TODO(issue/24571): remove '!'.\n  private cache!: MetadataCache;\n  private requests = new Map<string, RequestLocationMap>();\n  private lowerableFieldNames: Set<string>;\n\n  constructor(lowerableFieldNames: string[]) {\n    this.lowerableFieldNames = new Set<string>(lowerableFieldNames);\n  }\n\n  // RequestMap\n  getRequests(sourceFile: ts.SourceFile): RequestLocationMap {\n    let result = this.requests.get(sourceFile.fileName);\n    if (!result) {\n      // Force the metadata for this source file to be collected which\n      // will recursively call start() populating the request map;\n      this.cache.getMetadata(sourceFile);\n\n      // If we still don't have the requested metadata, the file is not a module\n      // or is a declaration file so return an empty map.\n      result = this.requests.get(sourceFile.fileName) || new Map<number, LoweringRequest>();\n    }\n    return result;\n  }\n\n  // MetadataTransformer\n  connect(cache: MetadataCache): void {\n    this.cache = cache;\n  }\n\n  start(sourceFile: ts.SourceFile): ValueTransform|undefined {\n    let identNumber = 0;\n    const freshIdent = () => createLoweredSymbol(identNumber++);\n    const requests = new Map<number, LoweringRequest>();\n    this.requests.set(sourceFile.fileName, requests);\n\n    const replaceNode = (node: ts.Node) => {\n      const name = freshIdent();\n      requests.set(node.pos, {name, kind: node.kind, location: node.pos, end: node.end});\n      return {__symbolic: 'reference', name};\n    };\n\n    const isExportedSymbol = (() => {\n      let exportTable: Set<string>;\n      return (node: ts.Node) => {\n        if (node.kind == ts.SyntaxKind.Identifier) {\n          const ident = node as ts.Identifier;\n\n          if (!exportTable) {\n            exportTable = createExportTableFor(sourceFile);\n          }\n          return exportTable.has(ident.text);\n        }\n        return false;\n      };\n    })();\n\n    const isExportedPropertyAccess = (node: ts.Node) => {\n      if (node.kind === ts.SyntaxKind.PropertyAccessExpression) {\n        const pae = node as ts.PropertyAccessExpression;\n        if (isExportedSymbol(pae.expression)) {\n          return true;\n        }\n      }\n      return false;\n    };\n\n    const hasLowerableParentCache = new Map<ts.Node, boolean>();\n\n    const shouldBeLowered = (node: ts.Node|undefined): boolean => {\n      if (node === undefined) {\n        return false;\n      }\n      let lowerable: boolean = false;\n      if ((node.kind === ts.SyntaxKind.ArrowFunction ||\n           node.kind === ts.SyntaxKind.FunctionExpression) &&\n          isEligibleForLowering(node)) {\n        lowerable = true;\n      } else if (\n          isLiteralFieldNamed(node, this.lowerableFieldNames) && isEligibleForLowering(node) &&\n          !isExportedSymbol(node) && !isExportedPropertyAccess(node)) {\n        lowerable = true;\n      }\n      return lowerable;\n    };\n\n    const hasLowerableParent = (node: ts.Node|undefined): boolean => {\n      if (node === undefined) {\n        return false;\n      }\n      if (!hasLowerableParentCache.has(node)) {\n        hasLowerableParentCache.set(\n            node, shouldBeLowered(node.parent) || hasLowerableParent(node.parent));\n      }\n      return hasLowerableParentCache.get(node)!;\n    };\n\n    const isLowerable = (node: ts.Node|undefined): boolean => {\n      if (node === undefined) {\n        return false;\n      }\n      return shouldBeLowered(node) && !hasLowerableParent(node);\n    };\n\n    return (value: MetadataValue, node: ts.Node): MetadataValue => {\n      if (!isPrimitive(value) && !isRewritten(value) && isLowerable(node)) {\n        return replaceNode(node);\n      }\n      return value;\n    };\n  }\n}\n\nfunction createExportTableFor(sourceFile: ts.SourceFile): Set<string> {\n  const exportTable = new Set<string>();\n  // Lazily collect all the exports from the source file\n  ts.forEachChild(sourceFile, function scan(node) {\n    switch (node.kind) {\n      case ts.SyntaxKind.ClassDeclaration:\n      case ts.SyntaxKind.FunctionDeclaration:\n      case ts.SyntaxKind.InterfaceDeclaration:\n        if ((ts.getCombinedModifierFlags(node as ts.Declaration) & ts.ModifierFlags.Export) != 0) {\n          const classDeclaration =\n              node as (ts.ClassDeclaration | ts.FunctionDeclaration | ts.InterfaceDeclaration);\n          const name = classDeclaration.name;\n          if (name) exportTable.add(name.text);\n        }\n        break;\n      case ts.SyntaxKind.VariableStatement:\n        const variableStatement = node as ts.VariableStatement;\n        for (const declaration of variableStatement.declarationList.declarations) {\n          scan(declaration);\n        }\n        break;\n      case ts.SyntaxKind.VariableDeclaration:\n        const variableDeclaration = node as ts.VariableDeclaration;\n        if ((ts.getCombinedModifierFlags(variableDeclaration) & ts.ModifierFlags.Export) != 0 &&\n            variableDeclaration.name.kind == ts.SyntaxKind.Identifier) {\n          const name = variableDeclaration.name as ts.Identifier;\n          exportTable.add(name.text);\n        }\n        break;\n      case ts.SyntaxKind.ExportDeclaration:\n        const exportDeclaration = node as ts.ExportDeclaration;\n        const {moduleSpecifier, exportClause} = exportDeclaration;\n        if (!moduleSpecifier && exportClause && ts.isNamedExports(exportClause)) {\n          exportClause.elements.forEach(spec => {\n            exportTable.add(spec.name.text);\n          });\n        }\n    }\n  });\n  return exportTable;\n}\n"]} |
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