469 lines
15 KiB
TypeScript
469 lines
15 KiB
TypeScript
/*---------------------------------------------------------------------------------------------
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* Copyright (c) Microsoft Corporation. All rights reserved.
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* Licensed under the MIT License. See License.txt in the project root for license information.
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*--------------------------------------------------------------------------------------------*/
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import * as ts from 'typescript';
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import * as lazy from 'lazy.js';
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import { duplex, through } from 'event-stream';
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import * as File from 'vinyl';
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import * as sm from 'source-map';
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import * as path from 'path';
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declare class FileSourceMap extends File {
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public sourceMap: sm.RawSourceMap;
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}
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enum CollectStepResult {
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Yes,
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YesAndRecurse,
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No,
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NoAndRecurse
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}
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function collect(node: ts.Node, fn: (node: ts.Node) => CollectStepResult): ts.Node[] {
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const result: ts.Node[] = [];
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function loop(node: ts.Node) {
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const stepResult = fn(node);
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if (stepResult === CollectStepResult.Yes || stepResult === CollectStepResult.YesAndRecurse) {
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result.push(node);
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}
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if (stepResult === CollectStepResult.YesAndRecurse || stepResult === CollectStepResult.NoAndRecurse) {
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ts.forEachChild(node, loop);
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}
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}
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loop(node);
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return result;
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}
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function clone<T>(object: T): T {
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const result = <T>{};
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for (const id in object) {
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result[id] = object[id];
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}
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return result;
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}
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function template(lines: string[]): string {
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let indent = '', wrap = '';
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if (lines.length > 1) {
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indent = '\t';
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wrap = '\n';
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}
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return `/*---------------------------------------------------------
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* Copyright (C) Microsoft Corporation. All rights reserved.
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*--------------------------------------------------------*/
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define([], [${ wrap + lines.map(l => indent + l).join(',\n') + wrap}]);`;
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}
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/**
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* Returns a stream containing the patched JavaScript and source maps.
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*/
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function nls(): NodeJS.ReadWriteStream {
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const input = through();
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const output = input.pipe(through(function (f: FileSourceMap) {
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if (!f.sourceMap) {
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return this.emit('error', new Error(`File ${f.relative} does not have sourcemaps.`));
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}
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let source = f.sourceMap.sources[0];
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if (!source) {
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return this.emit('error', new Error(`File ${f.relative} does not have a source in the source map.`));
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}
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const root = f.sourceMap.sourceRoot;
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if (root) {
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source = path.join(root, source);
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}
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const typescript = f.sourceMap.sourcesContent![0];
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if (!typescript) {
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return this.emit('error', new Error(`File ${f.relative} does not have the original content in the source map.`));
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}
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nls.patchFiles(f, typescript).forEach(f => this.emit('data', f));
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}));
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return duplex(input, output);
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}
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function isImportNode(node: ts.Node): boolean {
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return node.kind === ts.SyntaxKind.ImportDeclaration || node.kind === ts.SyntaxKind.ImportEqualsDeclaration;
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}
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module nls {
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export interface INlsStringResult {
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javascript: string;
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sourcemap: sm.RawSourceMap;
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nls?: string;
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nlsKeys?: string;
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}
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export interface ISpan {
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start: ts.LineAndCharacter;
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end: ts.LineAndCharacter;
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}
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export interface ILocalizeCall {
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keySpan: ISpan;
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key: string;
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valueSpan: ISpan;
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value: string;
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}
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export interface ILocalizeAnalysisResult {
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localizeCalls: ILocalizeCall[];
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nlsExpressions: ISpan[];
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}
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export interface IPatch {
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span: ISpan;
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content: string;
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}
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export function fileFrom(file: File, contents: string, path: string = file.path) {
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return new File({
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contents: Buffer.from(contents),
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base: file.base,
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cwd: file.cwd,
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path: path
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});
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}
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export function mappedPositionFrom(source: string, lc: ts.LineAndCharacter): sm.MappedPosition {
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return { source, line: lc.line + 1, column: lc.character };
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}
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export function lcFrom(position: sm.Position): ts.LineAndCharacter {
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return { line: position.line - 1, character: position.column };
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}
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export class SingleFileServiceHost implements ts.LanguageServiceHost {
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private file: ts.IScriptSnapshot;
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private lib: ts.IScriptSnapshot;
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constructor(private options: ts.CompilerOptions, private filename: string, contents: string) {
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this.file = ts.ScriptSnapshot.fromString(contents);
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this.lib = ts.ScriptSnapshot.fromString('');
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}
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getCompilationSettings = () => this.options;
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getScriptFileNames = () => [this.filename];
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getScriptVersion = () => '1';
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getScriptSnapshot = (name: string) => name === this.filename ? this.file : this.lib;
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getCurrentDirectory = () => '';
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getDefaultLibFileName = () => 'lib.d.ts';
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}
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function isCallExpressionWithinTextSpanCollectStep(textSpan: ts.TextSpan, node: ts.Node): CollectStepResult {
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if (!ts.textSpanContainsTextSpan({ start: node.pos, length: node.end - node.pos }, textSpan)) {
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return CollectStepResult.No;
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}
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return node.kind === ts.SyntaxKind.CallExpression ? CollectStepResult.YesAndRecurse : CollectStepResult.NoAndRecurse;
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}
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export function analyze(contents: string, options: ts.CompilerOptions = {}): ILocalizeAnalysisResult {
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const filename = 'file.ts';
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const serviceHost = new SingleFileServiceHost(Object.assign(clone(options), { noResolve: true }), filename, contents);
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const service = ts.createLanguageService(serviceHost);
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const sourceFile = ts.createSourceFile(filename, contents, ts.ScriptTarget.ES5, true);
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// all imports
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const imports = lazy(collect(sourceFile, n => isImportNode(n) ? CollectStepResult.YesAndRecurse : CollectStepResult.NoAndRecurse));
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// import nls = require('vs/nls');
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const importEqualsDeclarations = imports
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.filter(n => n.kind === ts.SyntaxKind.ImportEqualsDeclaration)
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.map(n => <ts.ImportEqualsDeclaration>n)
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.filter(d => d.moduleReference.kind === ts.SyntaxKind.ExternalModuleReference)
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.filter(d => (<ts.ExternalModuleReference>d.moduleReference).expression.getText() === '\'vs/nls\'');
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// import ... from 'vs/nls';
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const importDeclarations = imports
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.filter(n => n.kind === ts.SyntaxKind.ImportDeclaration)
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.map(n => <ts.ImportDeclaration>n)
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.filter(d => d.moduleSpecifier.kind === ts.SyntaxKind.StringLiteral)
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.filter(d => d.moduleSpecifier.getText() === '\'vs/nls\'')
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.filter(d => !!d.importClause && !!d.importClause.namedBindings);
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const nlsExpressions = importEqualsDeclarations
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.map(d => (<ts.ExternalModuleReference>d.moduleReference).expression)
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.concat(importDeclarations.map(d => d.moduleSpecifier))
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.map<ISpan>(d => ({
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start: ts.getLineAndCharacterOfPosition(sourceFile, d.getStart()),
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end: ts.getLineAndCharacterOfPosition(sourceFile, d.getEnd())
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}));
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// `nls.localize(...)` calls
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const nlsLocalizeCallExpressions = importDeclarations
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.filter(d => !!(d.importClause && d.importClause.namedBindings && d.importClause.namedBindings.kind === ts.SyntaxKind.NamespaceImport))
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.map(d => (<ts.NamespaceImport>d.importClause!.namedBindings).name)
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.concat(importEqualsDeclarations.map(d => d.name))
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// find read-only references to `nls`
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.map(n => service.getReferencesAtPosition(filename, n.pos + 1))
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.flatten()
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.filter(r => !r.isWriteAccess)
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// find the deepest call expressions AST nodes that contain those references
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.map(r => collect(sourceFile, n => isCallExpressionWithinTextSpanCollectStep(r.textSpan, n)))
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.map(a => lazy(a).last())
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.filter(n => !!n)
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.map(n => <ts.CallExpression>n)
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// only `localize` calls
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.filter(n => n.expression.kind === ts.SyntaxKind.PropertyAccessExpression && (<ts.PropertyAccessExpression>n.expression).name.getText() === 'localize');
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// `localize` named imports
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const allLocalizeImportDeclarations = importDeclarations
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.filter(d => !!(d.importClause && d.importClause.namedBindings && d.importClause.namedBindings.kind === ts.SyntaxKind.NamedImports))
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.map(d => ([] as any[]).concat((<ts.NamedImports>d.importClause!.namedBindings!).elements))
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.flatten();
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// `localize` read-only references
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const localizeReferences = allLocalizeImportDeclarations
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.filter(d => d.name.getText() === 'localize')
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.map(n => service.getReferencesAtPosition(filename, n.pos + 1))
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.flatten()
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.filter(r => !r.isWriteAccess);
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// custom named `localize` read-only references
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const namedLocalizeReferences = allLocalizeImportDeclarations
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.filter(d => d.propertyName && d.propertyName.getText() === 'localize')
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.map(n => service.getReferencesAtPosition(filename, n.name.pos + 1))
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.flatten()
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.filter(r => !r.isWriteAccess);
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// find the deepest call expressions AST nodes that contain those references
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const localizeCallExpressions = localizeReferences
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.concat(namedLocalizeReferences)
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.map(r => collect(sourceFile, n => isCallExpressionWithinTextSpanCollectStep(r.textSpan, n)))
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.map(a => lazy(a).last())
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.filter(n => !!n)
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.map(n => <ts.CallExpression>n);
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// collect everything
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const localizeCalls = nlsLocalizeCallExpressions
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.concat(localizeCallExpressions)
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.map(e => e.arguments)
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.filter(a => a.length > 1)
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.sort((a, b) => a[0].getStart() - b[0].getStart())
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.map<ILocalizeCall>(a => ({
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keySpan: { start: ts.getLineAndCharacterOfPosition(sourceFile, a[0].getStart()), end: ts.getLineAndCharacterOfPosition(sourceFile, a[0].getEnd()) },
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key: a[0].getText(),
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valueSpan: { start: ts.getLineAndCharacterOfPosition(sourceFile, a[1].getStart()), end: ts.getLineAndCharacterOfPosition(sourceFile, a[1].getEnd()) },
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value: a[1].getText()
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}));
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return {
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localizeCalls: localizeCalls.toArray(),
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nlsExpressions: nlsExpressions.toArray()
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};
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}
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export class TextModel {
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private lines: string[];
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private lineEndings: string[];
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constructor(contents: string) {
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const regex = /\r\n|\r|\n/g;
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let index = 0;
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let match: RegExpExecArray | null;
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this.lines = [];
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this.lineEndings = [];
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while (match = regex.exec(contents)) {
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this.lines.push(contents.substring(index, match.index));
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this.lineEndings.push(match[0]);
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index = regex.lastIndex;
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}
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if (contents.length > 0) {
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this.lines.push(contents.substring(index, contents.length));
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this.lineEndings.push('');
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}
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}
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public get(index: number): string {
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return this.lines[index];
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}
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public set(index: number, line: string): void {
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this.lines[index] = line;
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}
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public get lineCount(): number {
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return this.lines.length;
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}
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/**
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* Applies patch(es) to the model.
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* Multiple patches must be ordered.
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* Does not support patches spanning multiple lines.
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*/
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public apply(patch: IPatch): void {
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const startLineNumber = patch.span.start.line;
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const endLineNumber = patch.span.end.line;
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const startLine = this.lines[startLineNumber] || '';
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const endLine = this.lines[endLineNumber] || '';
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this.lines[startLineNumber] = [
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startLine.substring(0, patch.span.start.character),
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patch.content,
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endLine.substring(patch.span.end.character)
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].join('');
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for (let i = startLineNumber + 1; i <= endLineNumber; i++) {
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this.lines[i] = '';
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}
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}
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public toString(): string {
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return lazy(this.lines).zip(this.lineEndings)
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.flatten().toArray().join('');
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}
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}
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export function patchJavascript(patches: IPatch[], contents: string, moduleId: string): string {
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const model = new nls.TextModel(contents);
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// patch the localize calls
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lazy(patches).reverse().each(p => model.apply(p));
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// patch the 'vs/nls' imports
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const firstLine = model.get(0);
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const patchedFirstLine = firstLine.replace(/(['"])vs\/nls\1/g, `$1vs/nls!${moduleId}$1`);
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model.set(0, patchedFirstLine);
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return model.toString();
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}
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export function patchSourcemap(patches: IPatch[], rsm: sm.RawSourceMap, smc: sm.SourceMapConsumer): sm.RawSourceMap {
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const smg = new sm.SourceMapGenerator({
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file: rsm.file,
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sourceRoot: rsm.sourceRoot
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});
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patches = patches.reverse();
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let currentLine = -1;
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let currentLineDiff = 0;
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let source: string | null = null;
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smc.eachMapping(m => {
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const patch = patches[patches.length - 1];
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const original = { line: m.originalLine, column: m.originalColumn };
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const generated = { line: m.generatedLine, column: m.generatedColumn };
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if (currentLine !== generated.line) {
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currentLineDiff = 0;
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}
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currentLine = generated.line;
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generated.column += currentLineDiff;
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if (patch && m.generatedLine - 1 === patch.span.end.line && m.generatedColumn === patch.span.end.character) {
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const originalLength = patch.span.end.character - patch.span.start.character;
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const modifiedLength = patch.content.length;
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const lengthDiff = modifiedLength - originalLength;
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currentLineDiff += lengthDiff;
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generated.column += lengthDiff;
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patches.pop();
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}
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source = rsm.sourceRoot ? path.relative(rsm.sourceRoot, m.source) : m.source;
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source = source.replace(/\\/g, '/');
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smg.addMapping({ source, name: m.name, original, generated });
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}, null, sm.SourceMapConsumer.GENERATED_ORDER);
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if (source) {
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smg.setSourceContent(source, smc.sourceContentFor(source));
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}
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return JSON.parse(smg.toString());
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}
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export function patch(moduleId: string, typescript: string, javascript: string, sourcemap: sm.RawSourceMap): INlsStringResult {
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const { localizeCalls, nlsExpressions } = analyze(typescript);
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if (localizeCalls.length === 0) {
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return { javascript, sourcemap };
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}
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const nlsKeys = template(localizeCalls.map(lc => lc.key));
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const nls = template(localizeCalls.map(lc => lc.value));
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const smc = new sm.SourceMapConsumer(sourcemap);
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const positionFrom = mappedPositionFrom.bind(null, sourcemap.sources[0]);
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let i = 0;
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// build patches
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const patches = lazy(localizeCalls)
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.map(lc => ([
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{ range: lc.keySpan, content: '' + (i++) },
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{ range: lc.valueSpan, content: 'null' }
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]))
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.flatten()
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.map<IPatch>(c => {
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const start = lcFrom(smc.generatedPositionFor(positionFrom(c.range.start)));
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const end = lcFrom(smc.generatedPositionFor(positionFrom(c.range.end)));
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return { span: { start, end }, content: c.content };
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})
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.toArray();
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javascript = patchJavascript(patches, javascript, moduleId);
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// since imports are not within the sourcemap information,
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// we must do this MacGyver style
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if (nlsExpressions.length) {
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javascript = javascript.replace(/^define\(.*$/m, line => {
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return line.replace(/(['"])vs\/nls\1/g, `$1vs/nls!${moduleId}$1`);
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});
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}
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sourcemap = patchSourcemap(patches, sourcemap, smc);
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return { javascript, sourcemap, nlsKeys, nls };
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}
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export function patchFiles(javascriptFile: File, typescript: string): File[] {
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// hack?
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const moduleId = javascriptFile.relative
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.replace(/\.js$/, '')
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.replace(/\\/g, '/');
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const { javascript, sourcemap, nlsKeys, nls } = patch(
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moduleId,
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typescript,
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javascriptFile.contents.toString(),
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(<any>javascriptFile).sourceMap
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);
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const result: File[] = [fileFrom(javascriptFile, javascript)];
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(<any>result[0]).sourceMap = sourcemap;
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if (nlsKeys) {
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result.push(fileFrom(javascriptFile, nlsKeys, javascriptFile.path.replace(/\.js$/, '.nls.keys.js')));
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}
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if (nls) {
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result.push(fileFrom(javascriptFile, nls, javascriptFile.path.replace(/\.js$/, '.nls.js')));
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}
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return result;
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}
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}
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export = nls;
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