| "use strict"; |
| /** |
| * @license |
| * Copyright Google LLC All Rights Reserved. |
| * |
| * Use of this source code is governed by an MIT-style license that can be |
| * found in the LICENSE file at https://angular.io/license |
| */ |
| Object.defineProperty(exports, "__esModule", { value: true }); |
| exports.ImportManager = void 0; |
| const path_1 = require("path"); |
| const ts = require("typescript"); |
| /** Checks whether an analyzed import has the given import flag set. */ |
| const hasFlag = (data, flag) => (data.state & flag) !== 0; |
| /** |
| * Import manager that can be used to add or remove TypeScript imports within source |
| * files. The manager ensures that multiple transformations are applied properly |
| * without shifted offsets and that existing imports are re-used. |
| */ |
| class ImportManager { |
| constructor(_fileSystem, _printer) { |
| this._fileSystem = _fileSystem; |
| this._printer = _printer; |
| /** Map of source-files and their previously used identifier names. */ |
| this._usedIdentifierNames = new Map(); |
| /** Map of source files and their analyzed imports. */ |
| this._importCache = new Map(); |
| } |
| /** |
| * Analyzes the import of the specified source file if needed. In order to perform |
| * modifications to imports of a source file, we store all imports in memory and |
| * update the source file once all changes have been made. This is essential to |
| * ensure that we can re-use newly added imports and not break file offsets. |
| */ |
| _analyzeImportsIfNeeded(sourceFile) { |
| if (this._importCache.has(sourceFile)) { |
| return this._importCache.get(sourceFile); |
| } |
| const result = []; |
| for (let node of sourceFile.statements) { |
| if (!ts.isImportDeclaration(node) || !ts.isStringLiteral(node.moduleSpecifier)) { |
| continue; |
| } |
| const moduleName = node.moduleSpecifier.text; |
| // Handles side-effect imports which do neither have a name or |
| // specifiers. e.g. `import "my-package";` |
| if (!node.importClause) { |
| result.push({ moduleName, node, state: 0 /* UNMODIFIED */ }); |
| continue; |
| } |
| // Handles imports resolving to default exports of a module. |
| // e.g. `import moment from "moment";` |
| if (!node.importClause.namedBindings) { |
| result.push({ moduleName, node, name: node.importClause.name, state: 0 /* UNMODIFIED */ }); |
| continue; |
| } |
| // Handles imports with individual symbol specifiers. |
| // e.g. `import {A, B, C} from "my-module";` |
| if (ts.isNamedImports(node.importClause.namedBindings)) { |
| result.push({ |
| moduleName, |
| node, |
| specifiers: node.importClause.namedBindings.elements.map(el => ({ name: el.name, propertyName: el.propertyName })), |
| state: 0 /* UNMODIFIED */, |
| }); |
| } |
| else { |
| // Handles namespaced imports. e.g. `import * as core from "my-pkg";` |
| result.push({ |
| moduleName, |
| node, |
| name: node.importClause.namedBindings.name, |
| namespace: true, |
| state: 0 /* UNMODIFIED */, |
| }); |
| } |
| } |
| this._importCache.set(sourceFile, result); |
| return result; |
| } |
| /** |
| * Checks whether the given specifier, which can be relative to the base path, |
| * matches the passed module name. |
| */ |
| _isModuleSpecifierMatching(basePath, specifier, moduleName) { |
| return specifier.startsWith('.') ? |
| path_1.resolve(basePath, specifier) === path_1.resolve(basePath, moduleName) : |
| specifier === moduleName; |
| } |
| /** Deletes a given named binding import from the specified source file. */ |
| deleteNamedBindingImport(sourceFile, symbolName, moduleName) { |
| const sourceDir = path_1.dirname(sourceFile.fileName); |
| const fileImports = this._analyzeImportsIfNeeded(sourceFile); |
| for (let importData of fileImports) { |
| if (!this._isModuleSpecifierMatching(sourceDir, importData.moduleName, moduleName) || |
| !importData.specifiers) { |
| continue; |
| } |
| const specifierIndex = importData.specifiers.findIndex(d => (d.propertyName || d.name).text === symbolName); |
| if (specifierIndex !== -1) { |
| importData.specifiers.splice(specifierIndex, 1); |
| // if the import does no longer contain any specifiers after the removal of the |
| // given symbol, we can just mark the whole import for deletion. Otherwise, we mark |
| // it as modified so that it will be re-printed. |
| if (importData.specifiers.length === 0) { |
| importData.state |= 8 /* DELETED */; |
| } |
| else { |
| importData.state |= 2 /* MODIFIED */; |
| } |
| } |
| } |
| } |
| /** Deletes the import that matches the given import declaration if found. */ |
| deleteImportByDeclaration(declaration) { |
| const fileImports = this._analyzeImportsIfNeeded(declaration.getSourceFile()); |
| for (let importData of fileImports) { |
| if (importData.node === declaration) { |
| importData.state |= 8 /* DELETED */; |
| } |
| } |
| } |
| /** |
| * Adds an import to the given source file and returns the TypeScript expression that |
| * can be used to access the newly imported symbol. |
| * |
| * Whenever an import is added to a source file, it's recommended that the returned |
| * expression is used to reference th symbol. This is necessary because the symbol |
| * could be aliased if it would collide with existing imports in source file. |
| * |
| * @param sourceFile Source file to which the import should be added. |
| * @param symbolName Name of the symbol that should be imported. Can be null if |
| * the default export is requested. |
| * @param moduleName Name of the module of which the symbol should be imported. |
| * @param typeImport Whether the symbol is a type. |
| * @param ignoreIdentifierCollisions List of identifiers which can be ignored when |
| * the import manager checks for import collisions. |
| */ |
| addImportToSourceFile(sourceFile, symbolName, moduleName, typeImport = false, ignoreIdentifierCollisions = []) { |
| const sourceDir = path_1.dirname(sourceFile.fileName); |
| const fileImports = this._analyzeImportsIfNeeded(sourceFile); |
| let existingImport = null; |
| for (let importData of fileImports) { |
| if (!this._isModuleSpecifierMatching(sourceDir, importData.moduleName, moduleName)) { |
| continue; |
| } |
| // If no symbol name has been specified, the default import is requested. In that |
| // case we search for non-namespace and non-specifier imports. |
| if (!symbolName && !importData.namespace && !importData.specifiers) { |
| return ts.createIdentifier(importData.name.text); |
| } |
| // In case a "Type" symbol is imported, we can't use namespace imports |
| // because these only export symbols available at runtime (no types) |
| if (importData.namespace && !typeImport) { |
| return ts.createPropertyAccess(ts.createIdentifier(importData.name.text), ts.createIdentifier(symbolName || 'default')); |
| } |
| else if (importData.specifiers && symbolName) { |
| const existingSpecifier = importData.specifiers.find(s => s.propertyName ? s.propertyName.text === symbolName : s.name.text === symbolName); |
| if (existingSpecifier) { |
| return ts.createIdentifier(existingSpecifier.name.text); |
| } |
| // In case the symbol could not be found in an existing import, we |
| // keep track of the import declaration as it can be updated to include |
| // the specified symbol name without having to create a new import. |
| existingImport = importData; |
| } |
| } |
| // If there is an existing import that matches the specified module, we |
| // just update the import specifiers to also import the requested symbol. |
| if (existingImport) { |
| const propertyIdentifier = ts.createIdentifier(symbolName); |
| const generatedUniqueIdentifier = this._getUniqueIdentifier(sourceFile, symbolName, ignoreIdentifierCollisions); |
| const needsGeneratedUniqueName = generatedUniqueIdentifier.text !== symbolName; |
| const importName = needsGeneratedUniqueName ? generatedUniqueIdentifier : propertyIdentifier; |
| existingImport.specifiers.push({ |
| name: importName, |
| propertyName: needsGeneratedUniqueName ? propertyIdentifier : undefined, |
| }); |
| existingImport.state |= 2 /* MODIFIED */; |
| if (hasFlag(existingImport, 8 /* DELETED */)) { |
| // unset the deleted flag if the import is pending deletion, but |
| // can now be used for the new imported symbol. |
| existingImport.state &= ~8 /* DELETED */; |
| } |
| return importName; |
| } |
| let identifier = null; |
| let newImport = null; |
| if (symbolName) { |
| const propertyIdentifier = ts.createIdentifier(symbolName); |
| const generatedUniqueIdentifier = this._getUniqueIdentifier(sourceFile, symbolName, ignoreIdentifierCollisions); |
| const needsGeneratedUniqueName = generatedUniqueIdentifier.text !== symbolName; |
| identifier = needsGeneratedUniqueName ? generatedUniqueIdentifier : propertyIdentifier; |
| const newImportDecl = ts.createImportDeclaration(undefined, undefined, ts.createImportClause(undefined, ts.createNamedImports([])), ts.createStringLiteral(moduleName)); |
| newImport = { |
| moduleName, |
| node: newImportDecl, |
| specifiers: [{ |
| propertyName: needsGeneratedUniqueName ? propertyIdentifier : undefined, |
| name: identifier |
| }], |
| state: 4 /* ADDED */, |
| }; |
| } |
| else { |
| identifier = |
| this._getUniqueIdentifier(sourceFile, 'defaultExport', ignoreIdentifierCollisions); |
| const newImportDecl = ts.createImportDeclaration(undefined, undefined, ts.createImportClause(identifier, undefined), ts.createStringLiteral(moduleName)); |
| newImport = { |
| moduleName, |
| node: newImportDecl, |
| name: identifier, |
| state: 4 /* ADDED */, |
| }; |
| } |
| fileImports.push(newImport); |
| return identifier; |
| } |
| /** |
| * Applies the recorded changes in the update recorders of the corresponding source files. |
| * The changes are applied separately after all changes have been recorded because otherwise |
| * file offsets will change and the source files would need to be re-parsed after each change. |
| */ |
| recordChanges() { |
| this._importCache.forEach((fileImports, sourceFile) => { |
| const recorder = this._fileSystem.edit(this._fileSystem.resolve(sourceFile.fileName)); |
| const lastUnmodifiedImport = fileImports.reverse().find(i => i.state === 0 /* UNMODIFIED */); |
| const importStartIndex = lastUnmodifiedImport ? this._getEndPositionOfNode(lastUnmodifiedImport.node) : 0; |
| fileImports.forEach(importData => { |
| if (importData.state === 0 /* UNMODIFIED */) { |
| return; |
| } |
| if (hasFlag(importData, 8 /* DELETED */)) { |
| // Imports which do not exist in source file, can be just skipped as |
| // we do not need any replacement to delete the import. |
| if (!hasFlag(importData, 4 /* ADDED */)) { |
| recorder.remove(importData.node.getFullStart(), importData.node.getFullWidth()); |
| } |
| return; |
| } |
| if (importData.specifiers) { |
| const namedBindings = importData.node.importClause.namedBindings; |
| const importSpecifiers = importData.specifiers.map(s => ts.createImportSpecifier(s.propertyName, s.name)); |
| const updatedBindings = ts.updateNamedImports(namedBindings, importSpecifiers); |
| // In case an import has been added newly, we need to print the whole import |
| // declaration and insert it at the import start index. Otherwise, we just |
| // update the named bindings to not re-print the whole import (which could |
| // cause unnecessary formatting changes) |
| if (hasFlag(importData, 4 /* ADDED */)) { |
| const updatedImport = ts.updateImportDeclaration(importData.node, undefined, undefined, ts.createImportClause(undefined, updatedBindings), ts.createStringLiteral(importData.moduleName)); |
| const newImportText = this._printer.printNode(ts.EmitHint.Unspecified, updatedImport, sourceFile); |
| recorder.insertLeft(importStartIndex, importStartIndex === 0 ? `${newImportText}\n` : `\n${newImportText}`); |
| return; |
| } |
| else if (hasFlag(importData, 2 /* MODIFIED */)) { |
| const newNamedBindingsText = this._printer.printNode(ts.EmitHint.Unspecified, updatedBindings, sourceFile); |
| recorder.remove(namedBindings.getStart(), namedBindings.getWidth()); |
| recorder.insertRight(namedBindings.getStart(), newNamedBindingsText); |
| return; |
| } |
| } |
| else if (hasFlag(importData, 4 /* ADDED */)) { |
| const newImportText = this._printer.printNode(ts.EmitHint.Unspecified, importData.node, sourceFile); |
| recorder.insertLeft(importStartIndex, importStartIndex === 0 ? `${newImportText}\n` : `\n${newImportText}`); |
| return; |
| } |
| // we should never hit this, but we rather want to print a custom exception |
| // instead of just skipping imports silently. |
| throw Error('Unexpected import modification.'); |
| }); |
| }); |
| } |
| /** |
| * Corrects the line and character position of a given node. Since nodes of |
| * source files are immutable and we sometimes make changes to the containing |
| * source file, the node position might shift (e.g. if we add a new import before). |
| * |
| * This method can be used to retrieve a corrected position of the given node. This |
| * is helpful when printing out error messages which should reflect the new state of |
| * source files. |
| */ |
| correctNodePosition(node, offset, position) { |
| const sourceFile = node.getSourceFile(); |
| if (!this._importCache.has(sourceFile)) { |
| return position; |
| } |
| const newPosition = Object.assign({}, position); |
| const fileImports = this._importCache.get(sourceFile); |
| for (let importData of fileImports) { |
| const fullEnd = importData.node.getFullStart() + importData.node.getFullWidth(); |
| // Subtract or add lines based on whether an import has been deleted or removed |
| // before the actual node offset. |
| if (offset > fullEnd && hasFlag(importData, 8 /* DELETED */)) { |
| newPosition.line--; |
| } |
| else if (offset > fullEnd && hasFlag(importData, 4 /* ADDED */)) { |
| newPosition.line++; |
| } |
| } |
| return newPosition; |
| } |
| /** |
| * Returns an unique identifier name for the specified symbol name. |
| * @param sourceFile Source file to check for identifier collisions. |
| * @param symbolName Name of the symbol for which we want to generate an unique name. |
| * @param ignoreIdentifierCollisions List of identifiers which should be ignored when |
| * checking for identifier collisions in the given source file. |
| */ |
| _getUniqueIdentifier(sourceFile, symbolName, ignoreIdentifierCollisions) { |
| if (this._isUniqueIdentifierName(sourceFile, symbolName, ignoreIdentifierCollisions)) { |
| this._recordUsedIdentifier(sourceFile, symbolName); |
| return ts.createIdentifier(symbolName); |
| } |
| let name = null; |
| let counter = 1; |
| do { |
| name = `${symbolName}_${counter++}`; |
| } while (!this._isUniqueIdentifierName(sourceFile, name, ignoreIdentifierCollisions)); |
| this._recordUsedIdentifier(sourceFile, name); |
| return ts.createIdentifier(name); |
| } |
| /** |
| * Checks whether the specified identifier name is used within the given source file. |
| * @param sourceFile Source file to check for identifier collisions. |
| * @param name Name of the identifier which is checked for its uniqueness. |
| * @param ignoreIdentifierCollisions List of identifiers which should be ignored when |
| * checking for identifier collisions in the given source file. |
| */ |
| _isUniqueIdentifierName(sourceFile, name, ignoreIdentifierCollisions) { |
| if (this._usedIdentifierNames.has(sourceFile) && |
| this._usedIdentifierNames.get(sourceFile).indexOf(name) !== -1) { |
| return false; |
| } |
| // Walk through the source file and search for an identifier matching |
| // the given name. In that case, it's not guaranteed that this name |
| // is unique in the given declaration scope and we just return false. |
| const nodeQueue = [sourceFile]; |
| while (nodeQueue.length) { |
| const node = nodeQueue.shift(); |
| if (ts.isIdentifier(node) && node.text === name && |
| !ignoreIdentifierCollisions.includes(node)) { |
| return false; |
| } |
| nodeQueue.push(...node.getChildren()); |
| } |
| return true; |
| } |
| /** |
| * Records that the given identifier is used within the specified source file. This |
| * is necessary since we do not apply changes to source files per change, but still |
| * want to avoid conflicts with newly imported symbols. |
| */ |
| _recordUsedIdentifier(sourceFile, identifierName) { |
| this._usedIdentifierNames.set(sourceFile, (this._usedIdentifierNames.get(sourceFile) || []).concat(identifierName)); |
| } |
| /** |
| * Determines the full end of a given node. By default the end position of a node is |
| * before all trailing comments. This could mean that generated imports shift comments. |
| */ |
| _getEndPositionOfNode(node) { |
| const nodeEndPos = node.getEnd(); |
| const commentRanges = ts.getTrailingCommentRanges(node.getSourceFile().text, nodeEndPos); |
| if (!commentRanges || !commentRanges.length) { |
| return nodeEndPos; |
| } |
| return commentRanges[commentRanges.length - 1].end; |
| } |
| } |
| exports.ImportManager = ImportManager; |
| //# 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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 {FileSystem} from '@angular/cdk/schematics';\nimport {dirname, resolve} from 'path';\nimport * as ts from 'typescript';\n\n// tslint:disable:no-bitwise\n\n/** Enum describing the possible states of an analyzed import. */\nconst enum ImportState {\n  UNMODIFIED = 0b0,\n  MODIFIED = 0b10,\n  ADDED = 0b100,\n  DELETED = 0b1000,\n}\n\n/** Interface describing an import specifier. */\ninterface ImportSpecifier {\n  name: ts.Identifier;\n  propertyName?: ts.Identifier;\n}\n\n/** Interface describing an analyzed import. */\ninterface AnalyzedImport {\n  node: ts.ImportDeclaration;\n  moduleName: string;\n  name?: ts.Identifier;\n  specifiers?: ImportSpecifier[];\n  namespace?: boolean;\n  state: ImportState;\n}\n\n/** Checks whether an analyzed import has the given import flag set. */\nconst hasFlag = (data: AnalyzedImport, flag: ImportState) => (data.state & flag) !== 0;\n\n/**\n * Import manager that can be used to add or remove TypeScript imports within source\n * files. The manager ensures that multiple transformations are applied properly\n * without shifted offsets and that existing imports are re-used.\n */\nexport class ImportManager {\n  /** Map of source-files and their previously used identifier names. */\n  private _usedIdentifierNames = new Map<ts.SourceFile, string[]>();\n\n  /** Map of source files and their analyzed imports. */\n  private _importCache = new Map<ts.SourceFile, AnalyzedImport[]>();\n\n  constructor(\n      private _fileSystem: FileSystem,\n      private _printer: ts.Printer) {}\n\n  /**\n   * Analyzes the import of the specified source file if needed. In order to perform\n   * modifications to imports of a source file, we store all imports in memory and\n   * update the source file once all changes have been made. This is essential to\n   * ensure that we can re-use newly added imports and not break file offsets.\n   */\n  private _analyzeImportsIfNeeded(sourceFile: ts.SourceFile): AnalyzedImport[] {\n    if (this._importCache.has(sourceFile)) {\n      return this._importCache.get(sourceFile)!;\n    }\n\n    const result: AnalyzedImport[] = [];\n    for (let node of sourceFile.statements) {\n      if (!ts.isImportDeclaration(node) || !ts.isStringLiteral(node.moduleSpecifier)) {\n        continue;\n      }\n\n      const moduleName = node.moduleSpecifier.text;\n\n      // Handles side-effect imports which do neither have a name or\n      // specifiers. e.g. `import \"my-package\";`\n      if (!node.importClause) {\n        result.push({moduleName, node, state: ImportState.UNMODIFIED});\n        continue;\n      }\n\n      // Handles imports resolving to default exports of a module.\n      // e.g. `import moment from \"moment\";`\n      if (!node.importClause.namedBindings) {\n        result.push(\n            {moduleName, node, name: node.importClause.name, state: ImportState.UNMODIFIED});\n        continue;\n      }\n\n      // Handles imports with individual symbol specifiers.\n      // e.g. `import {A, B, C} from \"my-module\";`\n      if (ts.isNamedImports(node.importClause.namedBindings)) {\n        result.push({\n          moduleName,\n          node,\n          specifiers: node.importClause.namedBindings.elements.map(\n              el => ({name: el.name, propertyName: el.propertyName})),\n          state: ImportState.UNMODIFIED,\n        });\n      } else {\n        // Handles namespaced imports. e.g. `import * as core from \"my-pkg\";`\n        result.push({\n          moduleName,\n          node,\n          name: node.importClause.namedBindings.name,\n          namespace: true,\n          state: ImportState.UNMODIFIED,\n        });\n      }\n    }\n    this._importCache.set(sourceFile, result);\n    return result;\n  }\n\n  /**\n   * Checks whether the given specifier, which can be relative to the base path,\n   * matches the passed module name.\n   */\n  private _isModuleSpecifierMatching(basePath: string, specifier: string, moduleName: string):\n      boolean {\n    return specifier.startsWith('.') ?\n        resolve(basePath, specifier) === resolve(basePath, moduleName) :\n        specifier === moduleName;\n  }\n\n  /** Deletes a given named binding import from the specified source file. */\n  deleteNamedBindingImport(sourceFile: ts.SourceFile, symbolName: string, moduleName: string) {\n    const sourceDir = dirname(sourceFile.fileName);\n    const fileImports = this._analyzeImportsIfNeeded(sourceFile);\n\n    for (let importData of fileImports) {\n      if (!this._isModuleSpecifierMatching(sourceDir, importData.moduleName, moduleName) ||\n          !importData.specifiers) {\n        continue;\n      }\n\n      const specifierIndex =\n          importData.specifiers.findIndex(d => (d.propertyName || d.name).text === symbolName);\n      if (specifierIndex !== -1) {\n        importData.specifiers.splice(specifierIndex, 1);\n        // if the import does no longer contain any specifiers after the removal of the\n        // given symbol, we can just mark the whole import for deletion. Otherwise, we mark\n        // it as modified so that it will be re-printed.\n        if (importData.specifiers.length === 0) {\n          importData.state |= ImportState.DELETED;\n        } else {\n          importData.state |= ImportState.MODIFIED;\n        }\n      }\n    }\n  }\n\n  /** Deletes the import that matches the given import declaration if found. */\n  deleteImportByDeclaration(declaration: ts.ImportDeclaration) {\n    const fileImports = this._analyzeImportsIfNeeded(declaration.getSourceFile());\n    for (let importData of fileImports) {\n      if (importData.node === declaration) {\n        importData.state |= ImportState.DELETED;\n      }\n    }\n  }\n\n  /**\n   * Adds an import to the given source file and returns the TypeScript expression that\n   * can be used to access the newly imported symbol.\n   *\n   * Whenever an import is added to a source file, it's recommended that the returned\n   * expression is used to reference th symbol. This is necessary because the symbol\n   * could be aliased if it would collide with existing imports in source file.\n   *\n   * @param sourceFile Source file to which the import should be added.\n   * @param symbolName Name of the symbol that should be imported. Can be null if\n   *    the default export is requested.\n   * @param moduleName Name of the module of which the symbol should be imported.\n   * @param typeImport Whether the symbol is a type.\n   * @param ignoreIdentifierCollisions List of identifiers which can be ignored when\n   *    the import manager checks for import collisions.\n   */\n  addImportToSourceFile(\n      sourceFile: ts.SourceFile, symbolName: string|null, moduleName: string, typeImport = false,\n      ignoreIdentifierCollisions: ts.Identifier[] = []): ts.Expression {\n    const sourceDir = dirname(sourceFile.fileName);\n    const fileImports = this._analyzeImportsIfNeeded(sourceFile);\n\n    let existingImport: AnalyzedImport|null = null;\n    for (let importData of fileImports) {\n      if (!this._isModuleSpecifierMatching(sourceDir, importData.moduleName, moduleName)) {\n        continue;\n      }\n\n      // If no symbol name has been specified, the default import is requested. In that\n      // case we search for non-namespace and non-specifier imports.\n      if (!symbolName && !importData.namespace && !importData.specifiers) {\n        return ts.createIdentifier(importData.name!.text);\n      }\n\n      // In case a \"Type\" symbol is imported, we can't use namespace imports\n      // because these only export symbols available at runtime (no types)\n      if (importData.namespace && !typeImport) {\n        return ts.createPropertyAccess(\n            ts.createIdentifier(importData.name!.text),\n            ts.createIdentifier(symbolName || 'default'));\n      } else if (importData.specifiers && symbolName) {\n        const existingSpecifier = importData.specifiers.find(\n            s => s.propertyName ? s.propertyName.text === symbolName : s.name.text === symbolName);\n\n        if (existingSpecifier) {\n          return ts.createIdentifier(existingSpecifier.name.text);\n        }\n\n        // In case the symbol could not be found in an existing import, we\n        // keep track of the import declaration as it can be updated to include\n        // the specified symbol name without having to create a new import.\n        existingImport = importData;\n      }\n    }\n\n    // If there is an existing import that matches the specified module, we\n    // just update the import specifiers to also import the requested symbol.\n    if (existingImport) {\n      const propertyIdentifier = ts.createIdentifier(symbolName!);\n      const generatedUniqueIdentifier =\n          this._getUniqueIdentifier(sourceFile, symbolName!, ignoreIdentifierCollisions);\n      const needsGeneratedUniqueName = generatedUniqueIdentifier.text !== symbolName;\n      const importName = needsGeneratedUniqueName ? generatedUniqueIdentifier : propertyIdentifier;\n\n      existingImport.specifiers!.push({\n        name: importName,\n        propertyName: needsGeneratedUniqueName ? propertyIdentifier : undefined,\n      });\n      existingImport.state |= ImportState.MODIFIED;\n\n      if (hasFlag(existingImport, ImportState.DELETED)) {\n        // unset the deleted flag if the import is pending deletion, but\n        // can now be used for the new imported symbol.\n        existingImport.state &= ~ImportState.DELETED;\n      }\n\n      return importName;\n    }\n\n    let identifier: ts.Identifier|null = null;\n    let newImport: AnalyzedImport|null = null;\n\n    if (symbolName) {\n      const propertyIdentifier = ts.createIdentifier(symbolName);\n      const generatedUniqueIdentifier =\n          this._getUniqueIdentifier(sourceFile, symbolName, ignoreIdentifierCollisions);\n      const needsGeneratedUniqueName = generatedUniqueIdentifier.text !== symbolName;\n      identifier = needsGeneratedUniqueName ? generatedUniqueIdentifier : propertyIdentifier;\n\n      const newImportDecl = ts.createImportDeclaration(\n          undefined, undefined, ts.createImportClause(undefined, ts.createNamedImports([])),\n          ts.createStringLiteral(moduleName));\n\n      newImport = {\n        moduleName,\n        node: newImportDecl,\n        specifiers: [{\n          propertyName: needsGeneratedUniqueName ? propertyIdentifier : undefined,\n          name: identifier\n        }],\n        state: ImportState.ADDED,\n      };\n    } else {\n      identifier =\n          this._getUniqueIdentifier(sourceFile, 'defaultExport', ignoreIdentifierCollisions);\n      const newImportDecl = ts.createImportDeclaration(\n          undefined, undefined, ts.createImportClause(identifier, undefined),\n          ts.createStringLiteral(moduleName));\n      newImport = {\n        moduleName,\n        node: newImportDecl,\n        name: identifier,\n        state: ImportState.ADDED,\n      };\n    }\n    fileImports.push(newImport);\n    return identifier;\n  }\n\n  /**\n   * Applies the recorded changes in the update recorders of the corresponding source files.\n   * The changes are applied separately after all changes have been recorded because otherwise\n   * file offsets will change and the source files would need to be re-parsed after each change.\n   */\n  recordChanges() {\n    this._importCache.forEach((fileImports, sourceFile) => {\n      const recorder = this._fileSystem.edit(this._fileSystem.resolve(sourceFile.fileName));\n      const lastUnmodifiedImport =\n          fileImports.reverse().find(i => i.state === ImportState.UNMODIFIED);\n      const importStartIndex =\n          lastUnmodifiedImport ? this._getEndPositionOfNode(lastUnmodifiedImport.node) : 0;\n\n      fileImports.forEach(importData => {\n        if (importData.state === ImportState.UNMODIFIED) {\n          return;\n        }\n\n        if (hasFlag(importData, ImportState.DELETED)) {\n          // Imports which do not exist in source file, can be just skipped as\n          // we do not need any replacement to delete the import.\n          if (!hasFlag(importData, ImportState.ADDED)) {\n            recorder.remove(importData.node.getFullStart(), importData.node.getFullWidth());\n          }\n          return;\n        }\n\n        if (importData.specifiers) {\n          const namedBindings = importData.node.importClause!.namedBindings as ts.NamedImports;\n          const importSpecifiers =\n              importData.specifiers.map(s => ts.createImportSpecifier(s.propertyName, s.name));\n          const updatedBindings = ts.updateNamedImports(namedBindings, importSpecifiers);\n\n          // In case an import has been added newly, we need to print the whole import\n          // declaration and insert it at the import start index. Otherwise, we just\n          // update the named bindings to not re-print the whole import (which could\n          // cause unnecessary formatting changes)\n          if (hasFlag(importData, ImportState.ADDED)) {\n            const updatedImport = ts.updateImportDeclaration(\n                importData.node, undefined, undefined,\n                ts.createImportClause(undefined, updatedBindings),\n                ts.createStringLiteral(importData.moduleName));\n            const newImportText =\n                this._printer.printNode(ts.EmitHint.Unspecified, updatedImport, sourceFile);\n            recorder.insertLeft(\n                importStartIndex,\n                importStartIndex === 0 ? `${newImportText}\\n` : `\\n${newImportText}`);\n            return;\n          } else if (hasFlag(importData, ImportState.MODIFIED)) {\n            const newNamedBindingsText =\n                this._printer.printNode(ts.EmitHint.Unspecified, updatedBindings, sourceFile);\n            recorder.remove(namedBindings.getStart(), namedBindings.getWidth());\n            recorder.insertRight(namedBindings.getStart(), newNamedBindingsText);\n            return;\n          }\n        } else if (hasFlag(importData, ImportState.ADDED)) {\n          const newImportText =\n              this._printer.printNode(ts.EmitHint.Unspecified, importData.node, sourceFile);\n          recorder.insertLeft(\n              importStartIndex,\n              importStartIndex === 0 ? `${newImportText}\\n` : `\\n${newImportText}`);\n          return;\n        }\n\n        // we should never hit this, but we rather want to print a custom exception\n        // instead of just skipping imports silently.\n        throw Error('Unexpected import modification.');\n      });\n    });\n  }\n\n  /**\n   * Corrects the line and character position of a given node. Since nodes of\n   * source files are immutable and we sometimes make changes to the containing\n   * source file, the node position might shift (e.g. if we add a new import before).\n   *\n   * This method can be used to retrieve a corrected position of the given node. This\n   * is helpful when printing out error messages which should reflect the new state of\n   * source files.\n   */\n  correctNodePosition(node: ts.Node, offset: number, position: ts.LineAndCharacter) {\n    const sourceFile = node.getSourceFile();\n\n    if (!this._importCache.has(sourceFile)) {\n      return position;\n    }\n\n    const newPosition: ts.LineAndCharacter = {...position};\n    const fileImports = this._importCache.get(sourceFile)!;\n\n    for (let importData of fileImports) {\n      const fullEnd = importData.node.getFullStart() + importData.node.getFullWidth();\n      // Subtract or add lines based on whether an import has been deleted or removed\n      // before the actual node offset.\n      if (offset > fullEnd && hasFlag(importData, ImportState.DELETED)) {\n        newPosition.line--;\n      } else if (offset > fullEnd && hasFlag(importData, ImportState.ADDED)) {\n        newPosition.line++;\n      }\n    }\n    return newPosition;\n  }\n\n  /**\n   * Returns an unique identifier name for the specified symbol name.\n   * @param sourceFile Source file to check for identifier collisions.\n   * @param symbolName Name of the symbol for which we want to generate an unique name.\n   * @param ignoreIdentifierCollisions List of identifiers which should be ignored when\n   *    checking for identifier collisions in the given source file.\n   */\n  private _getUniqueIdentifier(\n      sourceFile: ts.SourceFile, symbolName: string,\n      ignoreIdentifierCollisions: ts.Identifier[]): ts.Identifier {\n    if (this._isUniqueIdentifierName(sourceFile, symbolName, ignoreIdentifierCollisions)) {\n      this._recordUsedIdentifier(sourceFile, symbolName);\n      return ts.createIdentifier(symbolName);\n    }\n\n    let name: string|null = null;\n    let counter = 1;\n    do {\n      name = `${symbolName}_${counter++}`;\n    } while (!this._isUniqueIdentifierName(sourceFile, name, ignoreIdentifierCollisions));\n\n    this._recordUsedIdentifier(sourceFile, name!);\n    return ts.createIdentifier(name!);\n  }\n\n  /**\n   * Checks whether the specified identifier name is used within the given source file.\n   * @param sourceFile Source file to check for identifier collisions.\n   * @param name Name of the identifier which is checked for its uniqueness.\n   * @param ignoreIdentifierCollisions List of identifiers which should be ignored when\n   *    checking for identifier collisions in the given source file.\n   */\n  private _isUniqueIdentifierName(\n      sourceFile: ts.SourceFile, name: string, ignoreIdentifierCollisions: ts.Identifier[]) {\n    if (this._usedIdentifierNames.has(sourceFile) &&\n        this._usedIdentifierNames.get(sourceFile)!.indexOf(name) !== -1) {\n      return false;\n    }\n\n    // Walk through the source file and search for an identifier matching\n    // the given name. In that case, it's not guaranteed that this name\n    // is unique in the given declaration scope and we just return false.\n    const nodeQueue: ts.Node[] = [sourceFile];\n    while (nodeQueue.length) {\n      const node = nodeQueue.shift()!;\n      if (ts.isIdentifier(node) && node.text === name &&\n          !ignoreIdentifierCollisions.includes(node)) {\n        return false;\n      }\n      nodeQueue.push(...node.getChildren());\n    }\n    return true;\n  }\n\n  /**\n   * Records that the given identifier is used within the specified source file. This\n   * is necessary since we do not apply changes to source files per change, but still\n   * want to avoid conflicts with newly imported symbols.\n   */\n  private _recordUsedIdentifier(sourceFile: ts.SourceFile, identifierName: string) {\n    this._usedIdentifierNames.set(\n        sourceFile, (this._usedIdentifierNames.get(sourceFile) || []).concat(identifierName));\n  }\n\n  /**\n   * Determines the full end of a given node. By default the end position of a node is\n   * before all trailing comments. This could mean that generated imports shift comments.\n   */\n  private _getEndPositionOfNode(node: ts.Node) {\n    const nodeEndPos = node.getEnd();\n    const commentRanges = ts.getTrailingCommentRanges(node.getSourceFile().text, nodeEndPos);\n    if (!commentRanges || !commentRanges.length) {\n      return nodeEndPos;\n    }\n    return commentRanges[commentRanges.length - 1]!.end;\n  }\n}\n"]} |
