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typescript_host.ts
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typescript_host.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 {AotSummaryResolver, CompileMetadataResolver, CompileNgModuleMetadata, CompilerConfig, DirectiveNormalizer, DirectiveResolver, DomElementSchemaRegistry, FormattedError, FormattedMessageChain, HtmlParser, I18NHtmlParser, JitSummaryResolver, Lexer, NgAnalyzedModules, NgModuleResolver, ParseTreeResult, Parser, PipeResolver, ResourceLoader, StaticReflector, StaticSymbol, StaticSymbolCache, StaticSymbolResolver, TemplateParser, analyzeNgModules, createOfflineCompileUrlResolver, isFormattedError} from '@angular/compiler';
import {ViewEncapsulation, ɵConsole as Console} from '@angular/core';
import * as ts from 'typescript';
import {AstResult, TemplateInfo} from './common';
import {createLanguageService} from './language_service';
import {ReflectorHost} from './reflector_host';
import {ExternalTemplate, InlineTemplate, getClassDeclFromTemplateNode} from './template';
import {Declaration, DeclarationError, Diagnostic, DiagnosticKind, DiagnosticMessageChain, LanguageService, LanguageServiceHost, Span, TemplateSource} from './types';
import {findTightestNode, getDirectiveClassLike} from './utils';
/**
* Create a `LanguageServiceHost`
*/
export function createLanguageServiceFromTypescript(
host: ts.LanguageServiceHost, service: ts.LanguageService): LanguageService {
const ngHost = new TypeScriptServiceHost(host, service);
const ngServer = createLanguageService(ngHost);
return ngServer;
}
/**
* The language service never needs the normalized versions of the metadata. To avoid parsing
* the content and resolving references, return an empty file. This also allows normalizing
* template that are syntatically incorrect which is required to provide completions in
* syntactically incorrect templates.
*/
export class DummyHtmlParser extends HtmlParser {
parse(): ParseTreeResult { return new ParseTreeResult([], []); }
}
/**
* Avoid loading resources in the language servcie by using a dummy loader.
*/
export class DummyResourceLoader extends ResourceLoader {
get(url: string): Promise<string> { return Promise.resolve(''); }
}
/**
* An implementation of a `LanguageServiceHost` for a TypeScript project.
*
* The `TypeScriptServiceHost` implements the Angular `LanguageServiceHost` using
* the TypeScript language services.
*
* @publicApi
*/
export class TypeScriptServiceHost implements LanguageServiceHost {
private readonly summaryResolver: AotSummaryResolver;
private readonly reflectorHost: ReflectorHost;
private readonly staticSymbolResolver: StaticSymbolResolver;
private readonly reflector: StaticReflector;
private readonly resolver: CompileMetadataResolver;
private readonly staticSymbolCache = new StaticSymbolCache();
private readonly fileToComponent = new Map<string, StaticSymbol>();
private readonly collectedErrors = new Map<string, any[]>();
private readonly fileVersions = new Map<string, string>();
private lastProgram: ts.Program|undefined = undefined;
private templateReferences: string[] = [];
private analyzedModules: NgAnalyzedModules = {
files: [],
ngModuleByPipeOrDirective: new Map(),
ngModules: [],
};
constructor(
private readonly host: ts.LanguageServiceHost, private readonly tsLS: ts.LanguageService) {
this.summaryResolver = new AotSummaryResolver(
{
loadSummary(filePath: string) { return null; },
isSourceFile(sourceFilePath: string) { return true; },
toSummaryFileName(sourceFilePath: string) { return sourceFilePath; },
fromSummaryFileName(filePath: string): string{return filePath;},
},
this.staticSymbolCache);
this.reflectorHost = new ReflectorHost(() => tsLS.getProgram() !, host);
this.staticSymbolResolver = new StaticSymbolResolver(
this.reflectorHost, this.staticSymbolCache, this.summaryResolver,
(e, filePath) => this.collectError(e, filePath));
this.reflector = new StaticReflector(
this.summaryResolver, this.staticSymbolResolver,
[], // knownMetadataClasses
[], // knownMetadataFunctions
(e, filePath) => this.collectError(e, filePath));
this.resolver = this.createMetadataResolver();
}
/**
* Creates a new metadata resolver. This should only be called once.
*/
private createMetadataResolver(): CompileMetadataResolver {
if (this.resolver) {
return this.resolver; // There should only be a single instance
}
const moduleResolver = new NgModuleResolver(this.reflector);
const directiveResolver = new DirectiveResolver(this.reflector);
const pipeResolver = new PipeResolver(this.reflector);
const elementSchemaRegistry = new DomElementSchemaRegistry();
const resourceLoader = new DummyResourceLoader();
const urlResolver = createOfflineCompileUrlResolver();
const htmlParser = new DummyHtmlParser();
// This tracks the CompileConfig in codegen.ts. Currently these options
// are hard-coded.
const config = new CompilerConfig({
defaultEncapsulation: ViewEncapsulation.Emulated,
useJit: false,
});
const directiveNormalizer =
new DirectiveNormalizer(resourceLoader, urlResolver, htmlParser, config);
return new CompileMetadataResolver(
config, htmlParser, moduleResolver, directiveResolver, pipeResolver,
new JitSummaryResolver(), elementSchemaRegistry, directiveNormalizer, new Console(),
this.staticSymbolCache, this.reflector,
(error, type) => this.collectError(error, type && type.filePath));
}
getTemplateReferences(): string[] { return [...this.templateReferences]; }
/**
* Checks whether the program has changed and returns all analyzed modules.
* If program has changed, invalidate all caches and update fileToComponent
* and templateReferences.
* In addition to returning information about NgModules, this method plays the
* same role as 'synchronizeHostData' in tsserver.
*/
getAnalyzedModules(): NgAnalyzedModules {
if (this.upToDate()) {
return this.analyzedModules;
}
// Invalidate caches
this.templateReferences = [];
this.fileToComponent.clear();
this.collectedErrors.clear();
const analyzeHost = {isSourceFile(filePath: string) { return true; }};
const programFiles = this.program.getSourceFiles().map(sf => sf.fileName);
this.analyzedModules =
analyzeNgModules(programFiles, analyzeHost, this.staticSymbolResolver, this.resolver);
// update template references and fileToComponent
const urlResolver = createOfflineCompileUrlResolver();
for (const ngModule of this.analyzedModules.ngModules) {
for (const directive of ngModule.declaredDirectives) {
const {metadata} = this.resolver.getNonNormalizedDirectiveMetadata(directive.reference) !;
if (metadata.isComponent && metadata.template && metadata.template.templateUrl) {
const templateName = urlResolver.resolve(
this.reflector.componentModuleUrl(directive.reference),
metadata.template.templateUrl);
this.fileToComponent.set(templateName, directive.reference);
this.templateReferences.push(templateName);
}
}
}
return this.analyzedModules;
}
/**
* Find all templates in the specified `file`.
* @param fileName TS or HTML file
*/
getTemplates(fileName: string): TemplateSource[] {
const results: TemplateSource[] = [];
if (fileName.endsWith('.ts')) {
// Find every template string in the file
const visit = (child: ts.Node) => {
const template = this.getInternalTemplate(child);
if (template) {
results.push(template);
} else {
ts.forEachChild(child, visit);
}
};
const sourceFile = this.getSourceFile(fileName);
if (sourceFile) {
ts.forEachChild(sourceFile, visit);
}
} else {
const template = this.getExternalTemplate(fileName);
if (template) {
results.push(template);
}
}
return results;
}
/**
* Return metadata about all class declarations in the file that are Angular
* directives. Potential matches are `@NgModule`, `@Component`, `@Directive`,
* `@Pipes`, etc. class declarations.
*
* @param fileName TS file
*/
getDeclarations(fileName: string): Declaration[] {
if (!fileName.endsWith('.ts')) {
return [];
}
const sourceFile = this.getSourceFile(fileName);
if (!sourceFile) {
return [];
}
const results: Declaration[] = [];
const visit = (child: ts.Node) => {
const candidate = getDirectiveClassLike(child);
if (candidate) {
const {decoratorId, classDecl} = candidate;
const declarationSpan = spanOf(decoratorId);
const className = classDecl.name !.text;
const classSymbol = this.reflector.getStaticSymbol(sourceFile.fileName, className);
// Ask the resolver to check if candidate is actually Angular directive
if (!this.resolver.isDirective(classSymbol)) {
return;
}
const data = this.resolver.getNonNormalizedDirectiveMetadata(classSymbol);
if (!data) {
return;
}
results.push({
type: classSymbol,
declarationSpan,
metadata: data.metadata,
errors: this.getCollectedErrors(declarationSpan, sourceFile),
});
} else {
child.forEachChild(visit);
}
};
ts.forEachChild(sourceFile, visit);
return results;
}
getSourceFile(fileName: string): ts.SourceFile|undefined {
if (!fileName.endsWith('.ts')) {
throw new Error(`Non-TS source file requested: ${fileName}`);
}
return this.program.getSourceFile(fileName);
}
get program() {
const program = this.tsLS.getProgram();
if (!program) {
// Program is very very unlikely to be undefined.
throw new Error('No program in language service!');
}
return program;
}
/**
* Checks whether the program has changed, and invalidate caches if it has.
* Returns true if modules are up-to-date, false otherwise.
* This should only be called by getAnalyzedModules().
*/
private upToDate() {
const program = this.program;
if (this.lastProgram === program) {
return true;
}
// Invalidate file that have changed in the static symbol resolver
const seen = new Set<string>();
for (const sourceFile of program.getSourceFiles()) {
const fileName = sourceFile.fileName;
seen.add(fileName);
const version = this.host.getScriptVersion(fileName);
const lastVersion = this.fileVersions.get(fileName);
if (version !== lastVersion) {
this.fileVersions.set(fileName, version);
this.staticSymbolResolver.invalidateFile(fileName);
}
}
// Remove file versions that are no longer in the file and invalidate them.
const missing = Array.from(this.fileVersions.keys()).filter(f => !seen.has(f));
missing.forEach(f => {
this.fileVersions.delete(f);
this.staticSymbolResolver.invalidateFile(f);
});
this.lastProgram = program;
return false;
}
/**
* Return the TemplateSource if `node` is a template node.
*
* For example,
*
* @Component({
* template: '<div></div>' <-- template node
* })
* class AppComponent {}
* ^---- class declaration node
*
* @param node Potential template node
*/
private getInternalTemplate(node: ts.Node): TemplateSource|undefined {
if (!ts.isStringLiteralLike(node)) {
return;
}
const classDecl = getClassDeclFromTemplateNode(node);
if (!classDecl || !classDecl.name) { // Does not handle anonymous class
return;
}
const fileName = node.getSourceFile().fileName;
const classSymbol = this.reflector.getStaticSymbol(fileName, classDecl.name.text);
return new InlineTemplate(node, classDecl, classSymbol, this);
}
/**
* Return the external template for `fileName`.
* @param fileName HTML file
*/
private getExternalTemplate(fileName: string): TemplateSource|undefined {
// First get the text for the template
const snapshot = this.host.getScriptSnapshot(fileName);
if (!snapshot) {
return;
}
const source = snapshot.getText(0, snapshot.getLength());
// Next find the component class symbol
const classSymbol = this.fileToComponent.get(fileName);
if (!classSymbol) {
return;
}
// Then use the class symbol to find the actual ts.ClassDeclaration node
const sourceFile = this.getSourceFile(classSymbol.filePath);
if (!sourceFile) {
return;
}
// TODO: This only considers top-level class declarations in a source file.
// This would not find a class declaration in a namespace, for example.
const classDecl = sourceFile.forEachChild((child) => {
if (ts.isClassDeclaration(child) && child.name && child.name.text === classSymbol.name) {
return child;
}
});
if (!classDecl) {
return;
}
return new ExternalTemplate(source, fileName, classDecl, classSymbol, this);
}
private collectError(error: any, filePath?: string) {
if (filePath) {
let errors = this.collectedErrors.get(filePath);
if (!errors) {
errors = [];
this.collectedErrors.set(filePath, errors);
}
errors.push(error);
}
}
private getCollectedErrors(defaultSpan: Span, sourceFile: ts.SourceFile): DeclarationError[] {
const errors = this.collectedErrors.get(sourceFile.fileName);
if (!errors) {
return [];
}
// TODO: Add better typings for the errors
return errors.map((e: any) => {
const line = e.line || (e.position && e.position.line);
const column = e.column || (e.position && e.position.column);
const span = spanAt(sourceFile, line, column) || defaultSpan;
if (isFormattedError(e)) {
return errorToDiagnosticWithChain(e, span);
}
return {message: e.message, span};
});
}
/**
* Return the parsed template for the template at the specified `position`.
* @param fileName TS or HTML file
* @param position Position of the template in the TS file, otherwise ignored.
*/
getTemplateAstAtPosition(fileName: string, position: number): TemplateInfo|undefined {
let template: TemplateSource|undefined;
if (fileName.endsWith('.ts')) {
const sourceFile = this.getSourceFile(fileName);
if (!sourceFile) {
return;
}
// Find the node that most closely matches the position
const node = findTightestNode(sourceFile, position);
if (!node) {
return;
}
template = this.getInternalTemplate(node);
} else {
template = this.getExternalTemplate(fileName);
}
if (!template) {
return;
}
const astResult = this.getTemplateAst(template);
if (astResult && astResult.htmlAst && astResult.templateAst && astResult.directive &&
astResult.directives && astResult.pipes && astResult.expressionParser) {
return {
position,
fileName,
template,
htmlAst: astResult.htmlAst,
directive: astResult.directive,
directives: astResult.directives,
pipes: astResult.pipes,
templateAst: astResult.templateAst,
expressionParser: astResult.expressionParser
};
}
}
getTemplateAst(template: TemplateSource): AstResult {
try {
const resolvedMetadata = this.resolver.getNonNormalizedDirectiveMetadata(template.type);
const metadata = resolvedMetadata && resolvedMetadata.metadata;
if (!metadata) {
return {};
}
const rawHtmlParser = new HtmlParser();
const htmlParser = new I18NHtmlParser(rawHtmlParser);
const expressionParser = new Parser(new Lexer());
const config = new CompilerConfig();
const parser = new TemplateParser(
config, this.reflector, expressionParser, new DomElementSchemaRegistry(), htmlParser,
null !, []);
const htmlResult = htmlParser.parse(template.source, '', {tokenizeExpansionForms: true});
const errors: Diagnostic[]|undefined = undefined;
const ngModule = this.analyzedModules.ngModuleByPipeOrDirective.get(template.type) ||
// Reported by the the declaration diagnostics.
findSuitableDefaultModule(this.analyzedModules);
if (!ngModule) {
return {};
}
const directives = ngModule.transitiveModule.directives
.map(d => this.resolver.getNonNormalizedDirectiveMetadata(d.reference))
.filter(d => d)
.map(d => d !.metadata.toSummary());
const pipes = ngModule.transitiveModule.pipes.map(
p => this.resolver.getOrLoadPipeMetadata(p.reference).toSummary());
const schemas = ngModule.schemas;
const parseResult = parser.tryParseHtml(htmlResult, metadata, directives, pipes, schemas);
return {
htmlAst: htmlResult.rootNodes,
templateAst: parseResult.templateAst,
directive: metadata, directives, pipes,
parseErrors: parseResult.errors, expressionParser, errors
};
} catch (e) {
const span = e.fileName === template.fileName && template.query.getSpanAt(e.line, e.column) ||
template.span;
return {
errors: [{
kind: DiagnosticKind.Error,
message: e.message, span,
}],
};
}
}
}
function findSuitableDefaultModule(modules: NgAnalyzedModules): CompileNgModuleMetadata|undefined {
let result: CompileNgModuleMetadata|undefined = undefined;
let resultSize = 0;
for (const module of modules.ngModules) {
const moduleSize = module.transitiveModule.directives.length;
if (moduleSize > resultSize) {
result = module;
resultSize = moduleSize;
}
}
return result;
}
function spanOf(node: ts.Node): Span {
return {start: node.getStart(), end: node.getEnd()};
}
function spanAt(sourceFile: ts.SourceFile, line: number, column: number): Span|undefined {
if (line != null && column != null) {
const position = ts.getPositionOfLineAndCharacter(sourceFile, line, column);
const findChild = function findChild(node: ts.Node): ts.Node | undefined {
if (node.kind > ts.SyntaxKind.LastToken && node.pos <= position && node.end > position) {
const betterNode = ts.forEachChild(node, findChild);
return betterNode || node;
}
};
const node = ts.forEachChild(sourceFile, findChild);
if (node) {
return {start: node.getStart(), end: node.getEnd()};
}
}
}
function convertChain(chain: FormattedMessageChain): DiagnosticMessageChain {
return {message: chain.message, next: chain.next ? convertChain(chain.next) : undefined};
}
function errorToDiagnosticWithChain(error: FormattedError, span: Span): DeclarationError {
return {message: error.chain ? convertChain(error.chain) : error.message, span};
}