mirror of
https://github.com/microsoft/vscode.git
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426 lines
12 KiB
TypeScript
426 lines
12 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 MarkdownIt = require('markdown-it');
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import Token = require('markdown-it/lib/token');
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import * as vscode from 'vscode';
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import { MarkdownContributionProvider } from './markdownExtensions';
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import { Slugifier } from './slugify';
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import { SkinnyTextDocument } from './tableOfContentsProvider';
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import { stringHash } from './util/hash';
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import { WebviewResourceProvider } from './util/resources';
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import { isOfScheme, Schemes } from './util/schemes';
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const UNICODE_NEWLINE_REGEX = /\u2028|\u2029/g;
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/**
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* Adds begin line index to the output via the 'data-line' data attribute.
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*/
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const pluginSourceMap: MarkdownIt.PluginSimple = (md): void => {
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// Set the attribute on every possible token.
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md.core.ruler.push('source_map_data_attribute', (state): void => {
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for (const token of state.tokens) {
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if (token.map && token.type !== 'inline') {
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token.attrSet('data-line', String(token.map[0]));
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token.attrJoin('class', 'code-line');
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token.attrJoin('dir', 'auto');
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}
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}
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});
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// The 'html_block' renderer doesn't respect `attrs`. We need to insert a marker.
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const originalHtmlBlockRenderer = md.renderer.rules['html_block'];
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if (originalHtmlBlockRenderer) {
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md.renderer.rules['html_block'] = (tokens, idx, options, env, self) => (
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`<div ${self.renderAttrs(tokens[idx])} ></div>\n` +
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originalHtmlBlockRenderer(tokens, idx, options, env, self)
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);
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}
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};
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/**
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* The markdown-it options that we expose in the settings.
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*/
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type MarkdownItConfig = Readonly<Required<Pick<MarkdownIt.Options, 'breaks' | 'linkify' | 'typographer'>>>;
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class TokenCache {
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private cachedDocument?: {
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readonly uri: vscode.Uri;
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readonly version: number;
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readonly config: MarkdownItConfig;
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};
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private tokens?: Token[];
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public tryGetCached(document: SkinnyTextDocument, config: MarkdownItConfig): Token[] | undefined {
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if (this.cachedDocument
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&& this.cachedDocument.uri.toString() === document.uri.toString()
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&& this.cachedDocument.version === document.version
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&& this.cachedDocument.config.breaks === config.breaks
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&& this.cachedDocument.config.linkify === config.linkify
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) {
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return this.tokens;
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}
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return undefined;
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}
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public update(document: SkinnyTextDocument, config: MarkdownItConfig, tokens: Token[]) {
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this.cachedDocument = {
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uri: document.uri,
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version: document.version,
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config,
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};
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this.tokens = tokens;
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}
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public clean(): void {
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this.cachedDocument = undefined;
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this.tokens = undefined;
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}
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}
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export interface RenderOutput {
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html: string;
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containingImages: { src: string }[];
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}
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interface RenderEnv {
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containingImages: { src: string }[];
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currentDocument: vscode.Uri | undefined;
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resourceProvider: WebviewResourceProvider | undefined;
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}
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export class MarkdownEngine {
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private md?: Promise<MarkdownIt>;
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private _slugCount = new Map<string, number>();
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private _tokenCache = new TokenCache();
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public constructor(
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private readonly contributionProvider: MarkdownContributionProvider,
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private readonly slugifier: Slugifier,
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) {
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contributionProvider.onContributionsChanged(() => {
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// Markdown plugin contributions may have changed
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this.md = undefined;
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});
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}
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private async getEngine(config: MarkdownItConfig): Promise<MarkdownIt> {
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if (!this.md) {
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this.md = (async () => {
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const markdownIt = await import('markdown-it');
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let md: MarkdownIt = markdownIt(await getMarkdownOptions(() => md));
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md.linkify.set({ fuzzyLink: false });
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for (const plugin of this.contributionProvider.contributions.markdownItPlugins.values()) {
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try {
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md = (await plugin)(md);
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} catch (e) {
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console.error('Could not load markdown it plugin', e);
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}
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}
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const frontMatterPlugin = await import('markdown-it-front-matter');
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// Extract rules from front matter plugin and apply at a lower precedence
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let fontMatterRule: any;
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frontMatterPlugin({
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block: {
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ruler: {
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before: (_id: any, _id2: any, rule: any) => { fontMatterRule = rule; }
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}
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}
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}, () => { /* noop */ });
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md.block.ruler.before('fence', 'front_matter', fontMatterRule, {
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alt: ['paragraph', 'reference', 'blockquote', 'list']
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});
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this.addImageRenderer(md);
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this.addFencedRenderer(md);
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this.addLinkNormalizer(md);
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this.addLinkValidator(md);
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this.addNamedHeaders(md);
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this.addLinkRenderer(md);
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md.use(pluginSourceMap);
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return md;
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})();
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}
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const md = await this.md!;
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md.set(config);
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return md;
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}
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public reloadPlugins() {
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this.md = undefined;
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}
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private tokenizeDocument(
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document: SkinnyTextDocument,
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config: MarkdownItConfig,
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engine: MarkdownIt
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): Token[] {
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const cached = this._tokenCache.tryGetCached(document, config);
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if (cached) {
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this.resetSlugCount();
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return cached;
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}
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const tokens = this.tokenizeString(document.getText(), engine);
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this._tokenCache.update(document, config, tokens);
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return tokens;
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}
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private tokenizeString(text: string, engine: MarkdownIt) {
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this.resetSlugCount();
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return engine.parse(text.replace(UNICODE_NEWLINE_REGEX, ''), {});
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}
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private resetSlugCount(): void {
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this._slugCount = new Map<string, number>();
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}
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public async render(input: SkinnyTextDocument | string, resourceProvider?: WebviewResourceProvider): Promise<RenderOutput> {
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const config = this.getConfig(typeof input === 'string' ? undefined : input.uri);
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const engine = await this.getEngine(config);
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const tokens = typeof input === 'string'
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? this.tokenizeString(input, engine)
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: this.tokenizeDocument(input, config, engine);
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const env: RenderEnv = {
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containingImages: [],
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currentDocument: typeof input === 'string' ? undefined : input.uri,
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resourceProvider,
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};
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const html = engine.renderer.render(tokens, {
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...engine.options,
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...config
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}, env);
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return {
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html,
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containingImages: env.containingImages
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};
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}
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public async parse(document: SkinnyTextDocument): Promise<Token[]> {
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const config = this.getConfig(document.uri);
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const engine = await this.getEngine(config);
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return this.tokenizeDocument(document, config, engine);
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}
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public cleanCache(): void {
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this._tokenCache.clean();
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}
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private getConfig(resource?: vscode.Uri): MarkdownItConfig {
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const config = vscode.workspace.getConfiguration('markdown', resource ?? null);
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return {
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breaks: config.get<boolean>('preview.breaks', false),
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linkify: config.get<boolean>('preview.linkify', true),
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typographer: config.get<boolean>('preview.typographer', false)
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};
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}
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private addImageRenderer(md: MarkdownIt): void {
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const original = md.renderer.rules.image;
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md.renderer.rules.image = (tokens: Token[], idx: number, options, env: RenderEnv, self) => {
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const token = tokens[idx];
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token.attrJoin('class', 'loading');
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const src = token.attrGet('src');
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if (src) {
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env.containingImages?.push({ src });
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const imgHash = stringHash(src);
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token.attrSet('id', `image-hash-${imgHash}`);
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if (!token.attrGet('data-src')) {
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token.attrSet('src', this.toResourceUri(src, env.currentDocument, env.resourceProvider));
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token.attrSet('data-src', src);
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}
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}
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if (original) {
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return original(tokens, idx, options, env, self);
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} else {
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return self.renderToken(tokens, idx, options);
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}
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};
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}
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private addFencedRenderer(md: MarkdownIt): void {
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const original = md.renderer.rules['fenced'];
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md.renderer.rules['fenced'] = (tokens: Token[], idx: number, options, env, self) => {
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const token = tokens[idx];
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if (token.map && token.map.length) {
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token.attrJoin('class', 'hljs');
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}
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if (original) {
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return original(tokens, idx, options, env, self);
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} else {
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return self.renderToken(tokens, idx, options);
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}
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};
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}
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private addLinkNormalizer(md: MarkdownIt): void {
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const normalizeLink = md.normalizeLink;
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md.normalizeLink = (link: string) => {
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try {
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// Normalize VS Code schemes to target the current version
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if (isOfScheme(Schemes.vscode, link) || isOfScheme(Schemes['vscode-insiders'], link)) {
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return normalizeLink(vscode.Uri.parse(link).with({ scheme: vscode.env.uriScheme }).toString());
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}
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} catch (e) {
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// noop
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}
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return normalizeLink(link);
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};
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}
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private addLinkValidator(md: MarkdownIt): void {
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const validateLink = md.validateLink;
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md.validateLink = (link: string) => {
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return validateLink(link)
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|| isOfScheme(Schemes.vscode, link)
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|| isOfScheme(Schemes['vscode-insiders'], link)
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|| /^data:image\/.*?;/.test(link);
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};
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}
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private addNamedHeaders(md: MarkdownIt): void {
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const original = md.renderer.rules.heading_open;
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md.renderer.rules.heading_open = (tokens: Token[], idx: number, options, env, self) => {
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const title = tokens[idx + 1].children!.reduce<string>((acc, t) => acc + t.content, '');
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let slug = this.slugifier.fromHeading(title);
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if (this._slugCount.has(slug.value)) {
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const count = this._slugCount.get(slug.value)!;
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this._slugCount.set(slug.value, count + 1);
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slug = this.slugifier.fromHeading(slug.value + '-' + (count + 1));
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} else {
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this._slugCount.set(slug.value, 0);
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}
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tokens[idx].attrSet('id', slug.value);
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if (original) {
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return original(tokens, idx, options, env, self);
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} else {
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return self.renderToken(tokens, idx, options);
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}
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};
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}
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private addLinkRenderer(md: MarkdownIt): void {
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const original = md.renderer.rules.link_open;
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md.renderer.rules.link_open = (tokens: Token[], idx: number, options, env, self) => {
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const token = tokens[idx];
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const href = token.attrGet('href');
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// A string, including empty string, may be `href`.
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if (typeof href === 'string') {
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token.attrSet('data-href', href);
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}
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if (original) {
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return original(tokens, idx, options, env, self);
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} else {
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return self.renderToken(tokens, idx, options);
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}
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};
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}
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private toResourceUri(href: string, currentDocument: vscode.Uri | undefined, resourceProvider: WebviewResourceProvider | undefined): string {
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try {
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// Support file:// links
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if (isOfScheme(Schemes.file, href)) {
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const uri = vscode.Uri.parse(href);
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if (resourceProvider) {
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return resourceProvider.asWebviewUri(uri).toString(true);
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}
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// Not sure how to resolve this
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return href;
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}
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// If original link doesn't look like a url with a scheme, assume it must be a link to a file in workspace
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if (!/^[a-z\-]+:/i.test(href)) {
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// Use a fake scheme for parsing
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let uri = vscode.Uri.parse('markdown-link:' + href);
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// Relative paths should be resolved correctly inside the preview but we need to
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// handle absolute paths specially to resolve them relative to the workspace root
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if (uri.path[0] === '/' && currentDocument) {
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const root = vscode.workspace.getWorkspaceFolder(currentDocument);
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if (root) {
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uri = vscode.Uri.joinPath(root.uri, uri.fsPath).with({
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fragment: uri.fragment,
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query: uri.query,
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});
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if (resourceProvider) {
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return resourceProvider.asWebviewUri(uri).toString(true);
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} else {
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uri = uri.with({ scheme: 'markdown-link' });
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}
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}
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}
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return uri.toString(true).replace(/^markdown-link:/, '');
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}
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return href;
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} catch {
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return href;
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}
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}
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}
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async function getMarkdownOptions(md: () => MarkdownIt): Promise<MarkdownIt.Options> {
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const hljs = (await import('highlight.js')).default;
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return {
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html: true,
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highlight: (str: string, lang?: string) => {
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lang = normalizeHighlightLang(lang);
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if (lang && hljs.getLanguage(lang)) {
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try {
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const highlighted = hljs.highlight(str, {
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language: lang,
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ignoreIllegals: true,
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}).value;
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return `<div>${highlighted}</div>`;
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}
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catch (error) { }
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}
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return `<code><div>${md().utils.escapeHtml(str)}</div></code>`;
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}
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};
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}
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function normalizeHighlightLang(lang: string | undefined) {
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switch (lang && lang.toLowerCase()) {
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case 'tsx':
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case 'typescriptreact':
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// Workaround for highlight not supporting tsx: https://github.com/isagalaev/highlight.js/issues/1155
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return 'jsx';
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case 'json5':
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case 'jsonc':
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return 'json';
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case 'c#':
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case 'csharp':
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return 'cs';
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default:
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return lang;
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}
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}
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