80 lines
3.7 KiB
JavaScript
Executable file
80 lines
3.7 KiB
JavaScript
Executable file
"use strict";
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/**
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* @license
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* Copyright Google LLC All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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var __importDefault = (this && this.__importDefault) || function (mod) {
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return (mod && mod.__esModule) ? mod : { "default": mod };
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};
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.CodeBlock = void 0;
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const typescript_1 = __importDefault(require("../../third_party/github.com/Microsoft/TypeScript/lib/typescript"));
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const ast_utils_1 = require("../ast-utils");
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const change_1 = require("../change");
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/** Counter used to generate unique IDs. */
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let uniqueIdCounter = 0;
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/**
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* Utility class used to generate blocks of code that
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* can be inserted by the devkit into a user's app.
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*/
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class CodeBlock {
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_imports = new Map();
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// Note: the methods here are defined as arrow function so that they can be destructured by
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// consumers without losing their context. This makes the API more concise.
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/** Function used to tag a code block in order to produce a `PendingCode` object. */
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code = (strings, ...params) => {
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return {
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expression: strings.map((part, index) => part + (params[index] || '')).join(''),
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imports: this._imports,
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};
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};
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/**
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* Used inside of a code block to mark external symbols and which module they should be imported
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* from. When the code is inserted, the required import statements will be produced automatically.
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* @param symbolName Name of the external symbol.
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* @param moduleName Module from which the symbol should be imported.
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*/
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external = (symbolName, moduleName) => {
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if (!this._imports.has(moduleName)) {
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this._imports.set(moduleName, new Map());
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}
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const symbolsPerModule = this._imports.get(moduleName);
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if (!symbolsPerModule.has(symbolName)) {
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symbolsPerModule.set(symbolName, `@@__SCHEMATIC_PLACEHOLDER_${uniqueIdCounter++}__@@`);
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}
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return symbolsPerModule.get(symbolName);
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};
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/**
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* Produces the necessary rules to transform a `PendingCode` object into valid code.
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* @param initialCode Code pending transformed.
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* @param filePath Path of the file in which the code will be inserted.
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*/
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static transformPendingCode(initialCode, filePath) {
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const code = { ...initialCode };
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const rules = [];
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code.imports.forEach((symbols, moduleName) => {
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symbols.forEach((placeholder, symbolName) => {
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rules.push((tree) => {
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const recorder = tree.beginUpdate(filePath);
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const sourceFile = typescript_1.default.createSourceFile(filePath, tree.readText(filePath), typescript_1.default.ScriptTarget.Latest, true);
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// Note that this could still technically clash if there's a top-level symbol called
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// `${symbolName}_alias`, however this is unlikely. We can revisit this if it becomes
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// a problem.
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const alias = (0, ast_utils_1.hasTopLevelIdentifier)(sourceFile, symbolName, moduleName)
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? symbolName + '_alias'
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: undefined;
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code.expression = code.expression.replace(new RegExp(placeholder, 'g'), alias || symbolName);
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(0, change_1.applyToUpdateRecorder)(recorder, [
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(0, ast_utils_1.insertImport)(sourceFile, filePath, symbolName, moduleName, false, alias),
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]);
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tree.commitUpdate(recorder);
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});
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});
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});
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return { code, rules };
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}
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}
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exports.CodeBlock = CodeBlock;
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