feat(ivy): implement initial ngcc package transformer (#24897)

PR Close #24897

packages/compiler-cli/src/ngcc/src/main.ts

@@ -6,9 +6,16 @@
  * found in the LICENSE file at https://angular.io/license
  */
 import {resolve} from 'path';
+import {PackageTransformer} from './transform/package_transformer';
 
 export function mainNgcc(args: string[]): number {
   const packagePath = resolve(args[0]);
 
+  // TODO: find all the package tyoes to transform
+  // TODO: error/warning logging/handling etc
+
+  const transformer = new PackageTransformer();
+  transformer.transform(packagePath, 'fesm2015');
+
   return 0;
 }

packages/compiler-cli/src/ngcc/src/transform/package_transformer.ts

@@ -0,0 +1,121 @@
+/**
+ * @license
+ * Copyright Google Inc. 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
+ */
+import {writeFileSync} from 'fs';
+import {dirname, relative, resolve} from 'path';
+import {mkdir} from 'shelljs';
+import * as ts from 'typescript';
+
+import {Analyzer} from '../analyzer';
+import {Esm2015ReflectionHost} from '../host/esm2015_host';
+import {Esm5ReflectionHost} from '../host/esm5_host';
+import {NgccReflectionHost} from '../host/ngcc_host';
+import {Esm2015FileParser} from '../parsing/esm2015_parser';
+import {Esm5FileParser} from '../parsing/esm5_parser';
+import {FileParser} from '../parsing/file_parser';
+import {getEntryPoints} from '../parsing/utils';
+import {Esm2015Renderer} from '../rendering/esm2015_renderer';
+import {Esm5Renderer} from '../rendering/esm5_renderer';
+import {FileInfo, Renderer} from '../rendering/renderer';
+
+
+/**
+ * A Package is stored in a directory on disk and that directory can contain one or more package
+ formats - e.g. fesm2015, UMD, etc.
+ *
+ * Each of these formats exposes one or more entry points, which are source files that need to be
+ * parsed to identify the decorated exported classes that need to be analyzed and compiled by one or
+ * more `DecoratorHandler` objects.
+ *
+ * Each entry point to a package is identified by a `SourceFile` that can be parsed and analyzed
+ * to identify classes that need to be transformed; and then finally rendered and written to disk.
+
+ * The actual file which needs to be transformed depends upon the package format.
+ *
+ * - Flat file packages have all the classes in a single file.
+ * - Other packages may re-export classes from other non-entry point files.
+ * - Some formats may contain multiple "modules" in a single file.
+ */
+export class PackageTransformer {
+  transform(packagePath: string, format: string): void {
+    const sourceNodeModules = this.findNodeModulesPath(packagePath);
+    const targetNodeModules = sourceNodeModules.replace(/node_modules$/, 'node_modules_ngtsc');
+    const entryPointPaths = getEntryPoints(packagePath, format);
+    entryPointPaths.forEach(entryPointPath => {
+      const options: ts.CompilerOptions = {allowJs: true, rootDir: entryPointPath};
+      const host = ts.createCompilerHost(options);
+      const packageProgram = ts.createProgram([entryPointPath], options, host);
+      const entryPointFile = packageProgram.getSourceFile(entryPointPath) !;
+      const typeChecker = packageProgram.getTypeChecker();
+
+      const reflectionHost = this.getHost(format, packageProgram);
+      const parser = this.getFileParser(format, packageProgram, reflectionHost);
+      const analyzer = new Analyzer(typeChecker, reflectionHost);
+      const renderer = this.getRenderer(format, packageProgram, reflectionHost);
+
+      const parsedFiles = parser.parseFile(entryPointFile);
+      parsedFiles.forEach(parsedFile => {
+        const analyzedFile = analyzer.analyzeFile(parsedFile);
+        const targetPath = resolve(
+            targetNodeModules, relative(sourceNodeModules, analyzedFile.sourceFile.fileName));
+        const {source, map} = renderer.renderFile(analyzedFile, targetPath);
+        this.writeFile(source);
+        if (map) {
+          this.writeFile(map);
+        }
+      });
+    });
+  }
+
+  getHost(format: string, program: ts.Program): NgccReflectionHost {
+    switch (format) {
+      case 'esm2015':
+      case 'fesm2015':
+        return new Esm2015ReflectionHost(program.getTypeChecker());
+      case 'fesm5':
+        return new Esm5ReflectionHost(program.getTypeChecker());
+      default:
+        throw new Error(`Relection host for "${format}" not yet implemented.`);
+    }
+  }
+
+  getFileParser(format: string, program: ts.Program, host: NgccReflectionHost): FileParser {
+    switch (format) {
+      case 'esm2015':
+      case 'fesm2015':
+        return new Esm2015FileParser(program, host);
+      case 'fesm5':
+        return new Esm5FileParser(program, host);
+      default:
+        throw new Error(`File parser for "${format}" not yet implemented.`);
+    }
+  }
+
+  getRenderer(format: string, program: ts.Program, host: NgccReflectionHost): Renderer {
+    switch (format) {
+      case 'esm2015':
+      case 'fesm2015':
+        return new Esm2015Renderer(host);
+      case 'fesm5':
+        return new Esm5Renderer(host);
+      default:
+        throw new Error(`Renderer for "${format}" not yet implemented.`);
+    }
+  }
+
+  findNodeModulesPath(src: string): string {
+    while (src && !/node_modules$/.test(src)) {
+      src = dirname(src);
+    }
+    return src;
+  }
+
+  writeFile(file: FileInfo): void {
+    mkdir('-p', dirname(file.path));
+    writeFileSync(file.path, file.contents, 'utf8');
+  }
+}