106 lines
3.9 KiB
TypeScript
106 lines
3.9 KiB
TypeScript
/**
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* @license
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* Copyright Google Inc. 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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import * as ts from 'typescript';
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import {LoweringRequest, RequestLocationMap, getExpressionLoweringTransformFactory} from '../../src/transformers/lower_expressions';
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import {Directory, MockAotContext, MockCompilerHost} from '../mocks';
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describe('Expression lowering', () => {
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it('should be able to lower a simple expression', () => {
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expect(convert('const a = 1 +◊b: 2◊;')).toBe('const b = 2; const a = 1 + b; export { b };');
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});
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it('should be able to lower an expression in a decorator', () => {
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expect(convert(`
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import {Component} from '@angular/core';
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@Component({
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provider: [{provide: 'someToken', useFactory:◊l: () => null◊}]
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})
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class MyClass {}
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`)).toContain('const l = () => null; exports.l = l;');
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});
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});
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function convert(annotatedSource: string) {
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const annotations: {start: number, length: number, name: string}[] = [];
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let adjustment = 0;
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const unannotatedSource = annotatedSource.replace(
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/◊([a-zA-Z]+):(.*)◊/g,
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(text: string, name: string, source: string, index: number): string => {
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annotations.push({start: index + adjustment, length: source.length, name});
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adjustment -= text.length - source.length;
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return source;
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});
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const baseFileName = 'someFile';
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const moduleName = '/' + baseFileName;
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const fileName = moduleName + '.ts';
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const context = new MockAotContext('/', {[baseFileName + '.ts']: unannotatedSource});
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const host = new MockCompilerHost(context);
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const sourceFile = ts.createSourceFile(
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fileName, unannotatedSource, ts.ScriptTarget.Latest, /* setParentNodes */ true);
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const requests = new Map<number, LoweringRequest>();
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for (const annotation of annotations) {
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const node = findNode(sourceFile, annotation.start, annotation.length);
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if (!node) throw new Error('Invalid test specification. Could not find the node to substitute');
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const location = node.pos;
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requests.set(location, {name: annotation.name, kind: node.kind, location, end: node.end});
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}
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const program = ts.createProgram(
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[fileName], {module: ts.ModuleKind.CommonJS, target: ts.ScriptTarget.ES2017}, host);
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const moduleSourceFile = program.getSourceFile(fileName);
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const transformers: ts.CustomTransformers = {
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before: [getExpressionLoweringTransformFactory({
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getRequests(sourceFile: ts.SourceFile): RequestLocationMap{
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if (sourceFile.fileName == moduleSourceFile.fileName) {
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return requests;
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} else {return new Map();}
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}
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})]
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};
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let result: string = '';
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const emitResult = program.emit(
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moduleSourceFile, (emittedFileName, data, writeByteOrderMark, onError, sourceFiles) => {
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if (fileName.startsWith(moduleName)) {
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result = data;
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}
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}, undefined, undefined, transformers);
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return normalizeResult(result);
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};
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function findNode(node: ts.Node, start: number, length: number): ts.Node|undefined {
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function find(node: ts.Node): ts.Node|undefined {
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if (node.getFullStart() == start && node.getEnd() == start + length) {
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return node;
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}
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if (node.getFullStart() <= start && node.getEnd() >= start + length) {
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return ts.forEachChild(node, find);
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}
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}
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return ts.forEachChild(node, find);
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}
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function normalizeResult(result: string): string {
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// Remove TypeScript prefixes
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// Remove new lines
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// Squish adjacent spaces
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// Remove prefix and postfix spaces
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return result.replace('"use strict";', ' ')
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.replace('exports.__esModule = true;', ' ')
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.replace('Object.defineProperty(exports, "__esModule", { value: true });', ' ')
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.replace(/\n/g, ' ')
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.replace(/ +/g, ' ')
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.replace(/^ /g, '')
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.replace(/ $/g, '');
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}
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