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node_emitter_transform.ts
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node_emitter_transform.ts
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/**
* @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 {GeneratedFile} from '@angular/compiler';
import * as ts from 'typescript';
import {TypeScriptNodeEmitter} from './node_emitter';
import {GENERATED_FILES} from './util';
function getPreamble(original: string) {
return `/**
* @fileoverview This file was generated by the Angular template compiler. Do not edit.
* ${original}
* @suppress {suspiciousCode,uselessCode,missingProperties,missingOverride,checkTypes}
* tslint:disable
*/`;
}
/**
* Returns a transformer that does two things for generated files (ngfactory etc):
* - adds a fileoverview JSDoc comment containing Closure Compiler specific "suppress"ions in JSDoc.
* The new comment will contain any fileoverview comment text from the original source file this
* file was generated from.
* - updates generated files that are not in the given map of generatedFiles to have an empty
* list of statements as their body.
*/
export function getAngularEmitterTransformFactory(
generatedFiles: Map<string, GeneratedFile>, program: ts.Program): () =>
(sourceFile: ts.SourceFile) => ts.SourceFile {
return function() {
const emitter = new TypeScriptNodeEmitter();
return function(sourceFile: ts.SourceFile): ts.SourceFile {
const g = generatedFiles.get(sourceFile.fileName);
const orig = g && program.getSourceFile(g.srcFileUrl);
let originalComment = '';
if (orig) originalComment = getFileoverviewComment(orig);
const preamble = getPreamble(originalComment);
if (g && g.stmts) {
const orig = program.getSourceFile(g.srcFileUrl);
let originalComment = '';
if (orig) originalComment = getFileoverviewComment(orig);
const [newSourceFile] = emitter.updateSourceFile(sourceFile, g.stmts, preamble);
return newSourceFile;
} else if (GENERATED_FILES.test(sourceFile.fileName)) {
// The file should be empty, but emitter.updateSourceFile would still add imports
// and various minutiae.
// Clear out the source file entirely, only including the preamble comment, so that
// ngc produces an empty .js file.
return ts.updateSourceFileNode(
sourceFile, [emitter.createCommentStatement(sourceFile, preamble)]);
}
return sourceFile;
};
};
}
/**
* Parses and returns the comment text (without start and end markers) of a \@fileoverview comment
* in the given source file. Returns the empty string if no such comment can be found.
*/
function getFileoverviewComment(sourceFile: ts.SourceFile): string {
const trivia = sourceFile.getFullText().substring(0, sourceFile.getStart());
const leadingComments = ts.getLeadingCommentRanges(trivia, 0);
if (!leadingComments || leadingComments.length === 0) return '';
const comment = leadingComments[0];
if (comment.kind !== ts.SyntaxKind.MultiLineCommentTrivia) return '';
// Only comments separated with a \n\n from the file contents are considered file-level comments
// in TypeScript.
if (sourceFile.getFullText().substring(comment.end, comment.end + 2) !== '\n\n') return '';
const commentText = sourceFile.getFullText().substring(comment.pos, comment.end);
// Closure Compiler ignores @suppress and similar if the comment contains @license.
if (commentText.indexOf('@license') !== -1) return '';
return commentText.replace(/^\/\*\*/, '').replace(/ ?\*\/$/, '');
}