108 lines
3.8 KiB
TypeScript
108 lines
3.8 KiB
TypeScript
/**
|
|
* @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 * as ts from 'typescript';
|
|
|
|
import {LoweringRequest, RequestLocationMap, getExpressionLoweringTransformFactory} from '../../src/transformers/lower_expressions';
|
|
import {Directory, MockAotContext, MockCompilerHost} from '../mocks';
|
|
|
|
describe('Expression lowering', () => {
|
|
it('should be able to lower a simple expression', () => {
|
|
expect(convert('const a = 1 +◊b: 2◊;')).toBe('const b = 2; const a = 1 + b; export { b };');
|
|
});
|
|
|
|
it('should be able to lower an expression in a decorator', () => {
|
|
expect(convert(`
|
|
import {Component} from '@angular/core';
|
|
|
|
@Component({
|
|
provider: [{provide: 'someToken', useFactory:◊l: () => null◊}]
|
|
})
|
|
class MyClass {}
|
|
`)).toContain('const l = () => null; exports.l = l;');
|
|
});
|
|
});
|
|
|
|
function convert(annotatedSource: string) {
|
|
const annotations: {start: number, length: number, name: string}[] = [];
|
|
let adjustment = 0;
|
|
const unannotatedSource = annotatedSource.replace(
|
|
/◊([a-zA-Z]+):(.*)◊/g,
|
|
(text: string, name: string, source: string, index: number): string => {
|
|
annotations.push({start: index + adjustment, length: source.length, name});
|
|
adjustment -= text.length - source.length;
|
|
return source;
|
|
});
|
|
|
|
const baseFileName = 'someFile';
|
|
const moduleName = '/' + baseFileName;
|
|
const fileName = moduleName + '.ts';
|
|
const context = new MockAotContext('/', {[baseFileName + '.ts']: unannotatedSource});
|
|
const host = new MockCompilerHost(context);
|
|
|
|
const sourceFile = ts.createSourceFile(
|
|
fileName, unannotatedSource, ts.ScriptTarget.Latest, /* setParentNodes */ true);
|
|
const requests = new Map<number, LoweringRequest>();
|
|
|
|
for (const annotation of annotations) {
|
|
const node = findNode(sourceFile, annotation.start, annotation.length);
|
|
expect(node).toBeDefined();
|
|
if (node) {
|
|
const location = node.pos;
|
|
requests.set(location, {name: annotation.name, kind: node.kind, location, end: node.end});
|
|
}
|
|
}
|
|
|
|
const program = ts.createProgram(
|
|
[fileName], {module: ts.ModuleKind.CommonJS, target: ts.ScriptTarget.ES2017}, host);
|
|
const moduleSourceFile = program.getSourceFile(fileName);
|
|
const transformers: ts.CustomTransformers = {
|
|
before: [getExpressionLoweringTransformFactory({
|
|
getRequests(sourceFile: ts.SourceFile): RequestLocationMap{
|
|
if (sourceFile.fileName == moduleSourceFile.fileName) {
|
|
return requests;
|
|
} else {return new Map();}
|
|
}
|
|
})]
|
|
};
|
|
let result: string = '';
|
|
const emitResult = program.emit(
|
|
moduleSourceFile, (emittedFileName, data, writeByteOrderMark, onError, sourceFiles) => {
|
|
if (fileName.startsWith(moduleName)) {
|
|
result = data;
|
|
}
|
|
}, undefined, undefined, transformers);
|
|
return normalizeResult(result);
|
|
};
|
|
|
|
function findNode(node: ts.Node, start: number, length: number): ts.Node|undefined {
|
|
function find(node: ts.Node): ts.Node|undefined {
|
|
if (node.getFullStart() == start && node.getEnd() == start + length) {
|
|
return node;
|
|
}
|
|
if (node.getFullStart() <= start && node.getEnd() >= start + length) {
|
|
return ts.forEachChild(node, find);
|
|
}
|
|
}
|
|
return ts.forEachChild(node, find);
|
|
}
|
|
|
|
function normalizeResult(result: string): string {
|
|
// Remove TypeScript prefixes
|
|
// Remove new lines
|
|
// Squish adjacent spaces
|
|
// Remove prefix and postfix spaces
|
|
return result.replace('"use strict";', ' ')
|
|
.replace('exports.__esModule = true;', ' ')
|
|
.replace('Object.defineProperty(exports, "__esModule", { value: true });', ' ')
|
|
.replace(/\n/g, ' ')
|
|
.replace(/ +/g, ' ')
|
|
.replace(/^ /g, '')
|
|
.replace(/ $/g, '');
|
|
}
|