658 lines
24 KiB
JavaScript
658 lines
24 KiB
JavaScript
/*---------------------------------------------------------------------------------------------
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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 DOM from './dom.js';
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import * as dompurify from './dompurify/dompurify.js';
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import { DomEmitter } from './event.js';
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import { createElement } from './formattedTextRenderer.js';
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import { StandardKeyboardEvent } from './keyboardEvent.js';
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import { StandardMouseEvent } from './mouseEvent.js';
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import { renderLabelWithIcons } from './ui/iconLabel/iconLabels.js';
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import { onUnexpectedError } from '../common/errors.js';
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import { Event } from '../common/event.js';
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import { escapeDoubleQuotes, parseHrefAndDimensions, removeMarkdownEscapes } from '../common/htmlContent.js';
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import { markdownEscapeEscapedIcons } from '../common/iconLabels.js';
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import { defaultGenerator } from '../common/idGenerator.js';
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import { Lazy } from '../common/lazy.js';
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import { DisposableStore } from '../common/lifecycle.js';
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import { marked } from '../common/marked/marked.js';
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import { parse } from '../common/marshalling.js';
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import { FileAccess, Schemas } from '../common/network.js';
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import { cloneAndChange } from '../common/objects.js';
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import { dirname, resolvePath } from '../common/resources.js';
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import { escape } from '../common/strings.js';
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import { URI } from '../common/uri.js';
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const defaultMarkedRenderers = Object.freeze({
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image: (href, title, text) => {
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let dimensions = [];
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let attributes = [];
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if (href) {
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({ href, dimensions } = parseHrefAndDimensions(href));
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attributes.push(`src="${escapeDoubleQuotes(href)}"`);
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}
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if (text) {
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attributes.push(`alt="${escapeDoubleQuotes(text)}"`);
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}
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if (title) {
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attributes.push(`title="${escapeDoubleQuotes(title)}"`);
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}
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if (dimensions.length) {
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attributes = attributes.concat(dimensions);
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}
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return '<img ' + attributes.join(' ') + '>';
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},
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paragraph: (text) => {
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return `<p>${text}</p>`;
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},
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link: (href, title, text) => {
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if (typeof href !== 'string') {
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return '';
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}
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// Remove markdown escapes. Workaround for https://github.com/chjj/marked/issues/829
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if (href === text) { // raw link case
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text = removeMarkdownEscapes(text);
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}
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title = typeof title === 'string' ? escapeDoubleQuotes(removeMarkdownEscapes(title)) : '';
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href = removeMarkdownEscapes(href);
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// HTML Encode href
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href = href.replace(/&/g, '&')
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.replace(/</g, '<')
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.replace(/>/g, '>')
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.replace(/"/g, '"')
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.replace(/'/g, ''');
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return `<a href="${href}" title="${title || href}">${text}</a>`;
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},
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});
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/**
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* Low-level way create a html element from a markdown string.
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*
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* **Note** that for most cases you should be using [`MarkdownRenderer`](./src/vs/editor/contrib/markdownRenderer/browser/markdownRenderer.ts)
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* which comes with support for pretty code block rendering and which uses the default way of handling links.
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*/
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export function renderMarkdown(markdown, options = {}, markedOptions = {}) {
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var _a, _b;
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const disposables = new DisposableStore();
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let isDisposed = false;
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const element = createElement(options);
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const _uriMassage = function (part) {
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let data;
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try {
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data = parse(decodeURIComponent(part));
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}
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catch (e) {
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// ignore
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}
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if (!data) {
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return part;
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}
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data = cloneAndChange(data, value => {
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if (markdown.uris && markdown.uris[value]) {
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return URI.revive(markdown.uris[value]);
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}
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else {
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return undefined;
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}
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});
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return encodeURIComponent(JSON.stringify(data));
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};
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const _href = function (href, isDomUri) {
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const data = markdown.uris && markdown.uris[href];
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let uri = URI.revive(data);
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if (isDomUri) {
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if (href.startsWith(Schemas.data + ':')) {
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return href;
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}
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if (!uri) {
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uri = URI.parse(href);
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}
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// this URI will end up as "src"-attribute of a dom node
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// and because of that special rewriting needs to be done
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// so that the URI uses a protocol that's understood by
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// browsers (like http or https)
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return FileAccess.uriToBrowserUri(uri).toString(true);
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}
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if (!uri) {
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return href;
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}
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if (URI.parse(href).toString() === uri.toString()) {
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return href; // no transformation performed
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}
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if (uri.query) {
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uri = uri.with({ query: _uriMassage(uri.query) });
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}
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return uri.toString();
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};
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const renderer = new marked.Renderer();
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renderer.image = defaultMarkedRenderers.image;
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renderer.link = defaultMarkedRenderers.link;
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renderer.paragraph = defaultMarkedRenderers.paragraph;
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// Will collect [id, renderedElement] tuples
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const codeBlocks = [];
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const syncCodeBlocks = [];
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if (options.codeBlockRendererSync) {
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renderer.code = (code, lang) => {
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const id = defaultGenerator.nextId();
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const value = options.codeBlockRendererSync(postProcessCodeBlockLanguageId(lang), code);
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syncCodeBlocks.push([id, value]);
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return `<div class="code" data-code="${id}">${escape(code)}</div>`;
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};
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}
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else if (options.codeBlockRenderer) {
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renderer.code = (code, lang) => {
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const id = defaultGenerator.nextId();
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const value = options.codeBlockRenderer(postProcessCodeBlockLanguageId(lang), code);
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codeBlocks.push(value.then(element => [id, element]));
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return `<div class="code" data-code="${id}">${escape(code)}</div>`;
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};
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}
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if (options.actionHandler) {
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const _activateLink = function (event) {
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let target = event.target;
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if (target.tagName !== 'A') {
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target = target.parentElement;
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if (!target || target.tagName !== 'A') {
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return;
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}
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}
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try {
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let href = target.dataset['href'];
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if (href) {
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if (markdown.baseUri) {
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href = resolveWithBaseUri(URI.from(markdown.baseUri), href);
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}
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options.actionHandler.callback(href, event);
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}
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}
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catch (err) {
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onUnexpectedError(err);
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}
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finally {
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event.preventDefault();
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}
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};
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const onClick = options.actionHandler.disposables.add(new DomEmitter(element, 'click'));
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const onAuxClick = options.actionHandler.disposables.add(new DomEmitter(element, 'auxclick'));
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options.actionHandler.disposables.add(Event.any(onClick.event, onAuxClick.event)(e => {
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const mouseEvent = new StandardMouseEvent(e);
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if (!mouseEvent.leftButton && !mouseEvent.middleButton) {
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return;
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}
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_activateLink(mouseEvent);
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}));
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options.actionHandler.disposables.add(DOM.addDisposableListener(element, 'keydown', (e) => {
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const keyboardEvent = new StandardKeyboardEvent(e);
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if (!keyboardEvent.equals(10 /* KeyCode.Space */) && !keyboardEvent.equals(3 /* KeyCode.Enter */)) {
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return;
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}
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_activateLink(keyboardEvent);
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}));
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}
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if (!markdown.supportHtml) {
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// TODO: Can we deprecated this in favor of 'supportHtml'?
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// Use our own sanitizer so that we can let through only spans.
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// Otherwise, we'd be letting all html be rendered.
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// If we want to allow markdown permitted tags, then we can delete sanitizer and sanitize.
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// We always pass the output through dompurify after this so that we don't rely on
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// marked for sanitization.
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markedOptions.sanitizer = (html) => {
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const match = markdown.isTrusted ? html.match(/^(<span[^>]+>)|(<\/\s*span>)$/) : undefined;
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return match ? html : '';
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};
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markedOptions.sanitize = true;
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markedOptions.silent = true;
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}
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markedOptions.renderer = renderer;
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// values that are too long will freeze the UI
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let value = (_a = markdown.value) !== null && _a !== void 0 ? _a : '';
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if (value.length > 100000) {
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value = `${value.substr(0, 100000)}…`;
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}
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// escape theme icons
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if (markdown.supportThemeIcons) {
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value = markdownEscapeEscapedIcons(value);
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}
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let renderedMarkdown;
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if (options.fillInIncompleteTokens) {
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// The defaults are applied by parse but not lexer()/parser(), and they need to be present
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const opts = Object.assign(Object.assign({}, marked.defaults), markedOptions);
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const tokens = marked.lexer(value, opts);
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const newTokens = fillInIncompleteTokens(tokens);
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renderedMarkdown = marked.parser(newTokens, opts);
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}
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else {
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renderedMarkdown = marked.parse(value, markedOptions);
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}
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// Rewrite theme icons
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if (markdown.supportThemeIcons) {
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const elements = renderLabelWithIcons(renderedMarkdown);
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renderedMarkdown = elements.map(e => typeof e === 'string' ? e : e.outerHTML).join('');
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}
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const htmlParser = new DOMParser();
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const markdownHtmlDoc = htmlParser.parseFromString(sanitizeRenderedMarkdown(markdown, renderedMarkdown), 'text/html');
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markdownHtmlDoc.body.querySelectorAll('img')
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.forEach(img => {
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const src = img.getAttribute('src'); // Get the raw 'src' attribute value as text, not the resolved 'src'
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if (src) {
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let href = src;
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try {
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if (markdown.baseUri) { // absolute or relative local path, or file: uri
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href = resolveWithBaseUri(URI.from(markdown.baseUri), href);
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}
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}
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catch (err) { }
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img.src = _href(href, true);
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}
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});
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markdownHtmlDoc.body.querySelectorAll('a')
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.forEach(a => {
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const href = a.getAttribute('href'); // Get the raw 'href' attribute value as text, not the resolved 'href'
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a.setAttribute('href', ''); // Clear out href. We use the `data-href` for handling clicks instead
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if (!href
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|| /^data:|javascript:/i.test(href)
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|| (/^command:/i.test(href) && !markdown.isTrusted)
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|| /^command:(\/\/\/)?_workbench\.downloadResource/i.test(href)) {
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// drop the link
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a.replaceWith(...a.childNodes);
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}
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else {
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let resolvedHref = _href(href, false);
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if (markdown.baseUri) {
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resolvedHref = resolveWithBaseUri(URI.from(markdown.baseUri), href);
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}
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a.dataset.href = resolvedHref;
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}
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});
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element.innerHTML = sanitizeRenderedMarkdown(markdown, markdownHtmlDoc.body.innerHTML);
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if (codeBlocks.length > 0) {
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Promise.all(codeBlocks).then((tuples) => {
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var _a, _b;
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if (isDisposed) {
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return;
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}
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const renderedElements = new Map(tuples);
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const placeholderElements = element.querySelectorAll(`div[data-code]`);
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for (const placeholderElement of placeholderElements) {
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const renderedElement = renderedElements.get((_a = placeholderElement.dataset['code']) !== null && _a !== void 0 ? _a : '');
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if (renderedElement) {
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DOM.reset(placeholderElement, renderedElement);
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}
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}
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(_b = options.asyncRenderCallback) === null || _b === void 0 ? void 0 : _b.call(options);
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});
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}
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else if (syncCodeBlocks.length > 0) {
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const renderedElements = new Map(syncCodeBlocks);
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const placeholderElements = element.querySelectorAll(`div[data-code]`);
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for (const placeholderElement of placeholderElements) {
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const renderedElement = renderedElements.get((_b = placeholderElement.dataset['code']) !== null && _b !== void 0 ? _b : '');
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if (renderedElement) {
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DOM.reset(placeholderElement, renderedElement);
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}
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}
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}
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// signal size changes for image tags
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if (options.asyncRenderCallback) {
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for (const img of element.getElementsByTagName('img')) {
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const listener = disposables.add(DOM.addDisposableListener(img, 'load', () => {
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listener.dispose();
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options.asyncRenderCallback();
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}));
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}
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}
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return {
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element,
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dispose: () => {
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isDisposed = true;
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disposables.dispose();
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}
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};
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}
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function postProcessCodeBlockLanguageId(lang) {
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if (!lang) {
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return '';
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}
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const parts = lang.split(/[\s+|:|,|\{|\?]/, 1);
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if (parts.length) {
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return parts[0];
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}
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return lang;
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}
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function resolveWithBaseUri(baseUri, href) {
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const hasScheme = /^\w[\w\d+.-]*:/.test(href);
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if (hasScheme) {
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return href;
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}
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if (baseUri.path.endsWith('/')) {
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return resolvePath(baseUri, href).toString();
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}
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else {
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return resolvePath(dirname(baseUri), href).toString();
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}
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}
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function sanitizeRenderedMarkdown(options, renderedMarkdown) {
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const { config, allowedSchemes } = getSanitizerOptions(options);
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dompurify.addHook('uponSanitizeAttribute', (element, e) => {
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if (e.attrName === 'style' || e.attrName === 'class') {
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if (element.tagName === 'SPAN') {
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if (e.attrName === 'style') {
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e.keepAttr = /^(color\:(#[0-9a-fA-F]+|var\(--vscode(-[a-zA-Z]+)+\));)?(background-color\:(#[0-9a-fA-F]+|var\(--vscode(-[a-zA-Z]+)+\));)?$/.test(e.attrValue);
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return;
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}
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else if (e.attrName === 'class') {
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e.keepAttr = /^codicon codicon-[a-z\-]+( codicon-modifier-[a-z\-]+)?$/.test(e.attrValue);
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return;
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}
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}
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e.keepAttr = false;
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return;
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}
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});
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const hook = DOM.hookDomPurifyHrefAndSrcSanitizer(allowedSchemes);
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try {
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return dompurify.sanitize(renderedMarkdown, Object.assign(Object.assign({}, config), { RETURN_TRUSTED_TYPE: true }));
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}
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finally {
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dompurify.removeHook('uponSanitizeAttribute');
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hook.dispose();
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}
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}
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export const allowedMarkdownAttr = [
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'align',
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'autoplay',
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'alt',
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'class',
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'controls',
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'data-code',
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'data-href',
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'height',
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'href',
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'loop',
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'muted',
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'playsinline',
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'poster',
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'src',
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'style',
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'target',
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'title',
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'width',
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'start',
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];
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function getSanitizerOptions(options) {
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const allowedSchemes = [
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Schemas.http,
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Schemas.https,
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Schemas.mailto,
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Schemas.data,
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Schemas.file,
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Schemas.vscodeFileResource,
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Schemas.vscodeRemote,
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Schemas.vscodeRemoteResource,
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];
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if (options.isTrusted) {
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allowedSchemes.push(Schemas.command);
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}
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return {
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config: {
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// allowedTags should included everything that markdown renders to.
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// Since we have our own sanitize function for marked, it's possible we missed some tag so let dompurify make sure.
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// HTML tags that can result from markdown are from reading https://spec.commonmark.org/0.29/
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// HTML table tags that can result from markdown are from https://github.github.com/gfm/#tables-extension-
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ALLOWED_TAGS: [...DOM.basicMarkupHtmlTags],
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ALLOWED_ATTR: allowedMarkdownAttr,
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ALLOW_UNKNOWN_PROTOCOLS: true,
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},
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allowedSchemes
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};
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}
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/**
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* Strips all markdown from `string`, if it's an IMarkdownString. For example
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* `# Header` would be output as `Header`. If it's not, the string is returned.
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*/
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export function renderStringAsPlaintext(string) {
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return typeof string === 'string' ? string : renderMarkdownAsPlaintext(string);
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}
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/**
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* Strips all markdown from `markdown`. For example `# Header` would be output as `Header`.
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*/
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export function renderMarkdownAsPlaintext(markdown) {
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var _a;
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// values that are too long will freeze the UI
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let value = (_a = markdown.value) !== null && _a !== void 0 ? _a : '';
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if (value.length > 100000) {
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value = `${value.substr(0, 100000)}…`;
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}
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const html = marked.parse(value, { renderer: plainTextRenderer.value }).replace(/&(#\d+|[a-zA-Z]+);/g, m => { var _a; return (_a = unescapeInfo.get(m)) !== null && _a !== void 0 ? _a : m; });
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return sanitizeRenderedMarkdown({ isTrusted: false }, html).toString();
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}
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const unescapeInfo = new Map([
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['"', '"'],
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[' ', ' '],
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['&', '&'],
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[''', '\''],
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['<', '<'],
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['>', '>'],
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]);
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const plainTextRenderer = new Lazy(() => {
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const renderer = new marked.Renderer();
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renderer.code = (code) => {
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return code;
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};
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renderer.blockquote = (quote) => {
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return quote;
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};
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renderer.html = (_html) => {
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return '';
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};
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renderer.heading = (text, _level, _raw) => {
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return text + '\n';
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};
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renderer.hr = () => {
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return '';
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};
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renderer.list = (body, _ordered) => {
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return body;
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};
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renderer.listitem = (text) => {
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return text + '\n';
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};
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renderer.paragraph = (text) => {
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return text + '\n';
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};
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renderer.table = (header, body) => {
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return header + body + '\n';
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};
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renderer.tablerow = (content) => {
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return content;
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};
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renderer.tablecell = (content, _flags) => {
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return content + ' ';
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};
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renderer.strong = (text) => {
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return text;
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};
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renderer.em = (text) => {
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return text;
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};
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renderer.codespan = (code) => {
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return code;
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};
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renderer.br = () => {
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return '\n';
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};
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renderer.del = (text) => {
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return text;
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};
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renderer.image = (_href, _title, _text) => {
|
|
return '';
|
|
};
|
|
renderer.text = (text) => {
|
|
return text;
|
|
};
|
|
renderer.link = (_href, _title, text) => {
|
|
return text;
|
|
};
|
|
return renderer;
|
|
});
|
|
function mergeRawTokenText(tokens) {
|
|
let mergedTokenText = '';
|
|
tokens.forEach(token => {
|
|
mergedTokenText += token.raw;
|
|
});
|
|
return mergedTokenText;
|
|
}
|
|
function completeSingleLinePattern(token) {
|
|
for (const subtoken of token.tokens) {
|
|
if (subtoken.type === 'text') {
|
|
const lines = subtoken.raw.split('\n');
|
|
const lastLine = lines[lines.length - 1];
|
|
if (lastLine.includes('`')) {
|
|
return completeCodespan(token);
|
|
}
|
|
else if (lastLine.includes('**')) {
|
|
return completeDoublestar(token);
|
|
}
|
|
else if (lastLine.match(/\*\w/)) {
|
|
return completeStar(token);
|
|
}
|
|
else if (lastLine.match(/(^|\s)__\w/)) {
|
|
return completeDoubleUnderscore(token);
|
|
}
|
|
else if (lastLine.match(/(^|\s)_\w/)) {
|
|
return completeUnderscore(token);
|
|
}
|
|
else if (lastLine.match(/(^|\s)\[.*\]\(\w*/)) {
|
|
return completeLinkTarget(token);
|
|
}
|
|
else if (lastLine.match(/(^|\s)\[\w/)) {
|
|
return completeLinkText(token);
|
|
}
|
|
}
|
|
}
|
|
return undefined;
|
|
}
|
|
// function completeListItemPattern(token: marked.Tokens.List): marked.Tokens.List | undefined {
|
|
// // Patch up this one list item
|
|
// const lastItem = token.items[token.items.length - 1];
|
|
// const newList = completeSingleLinePattern(lastItem);
|
|
// if (!newList || newList.type !== 'list') {
|
|
// // Nothing to fix, or not a pattern we were expecting
|
|
// return;
|
|
// }
|
|
// // Re-parse the whole list with the last item replaced
|
|
// const completeList = marked.lexer(mergeRawTokenText(token.items.slice(0, token.items.length - 1)) + newList.items[0].raw);
|
|
// if (completeList.length === 1 && completeList[0].type === 'list') {
|
|
// return completeList[0];
|
|
// }
|
|
// // Not a pattern we were expecting
|
|
// return undefined;
|
|
// }
|
|
export function fillInIncompleteTokens(tokens) {
|
|
let i;
|
|
let newTokens;
|
|
for (i = 0; i < tokens.length; i++) {
|
|
const token = tokens[i];
|
|
if (token.type === 'paragraph' && token.raw.match(/(\n|^)```/)) {
|
|
// If the code block was complete, it would be in a type='code'
|
|
newTokens = completeCodeBlock(tokens.slice(i));
|
|
break;
|
|
}
|
|
if (token.type === 'paragraph' && token.raw.match(/(\n|^)\|/)) {
|
|
newTokens = completeTable(tokens.slice(i));
|
|
break;
|
|
}
|
|
// if (i === tokens.length - 1 && token.type === 'list') {
|
|
// const newListToken = completeListItemPattern(token);
|
|
// if (newListToken) {
|
|
// newTokens = [newListToken];
|
|
// break;
|
|
// }
|
|
// }
|
|
if (i === tokens.length - 1 && token.type === 'paragraph') {
|
|
// Only operates on a single token, because any newline that follows this should break these patterns
|
|
const newToken = completeSingleLinePattern(token);
|
|
if (newToken) {
|
|
newTokens = [newToken];
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
if (newTokens) {
|
|
const newTokensList = [
|
|
...tokens.slice(0, i),
|
|
...newTokens
|
|
];
|
|
newTokensList.links = tokens.links;
|
|
return newTokensList;
|
|
}
|
|
return tokens;
|
|
}
|
|
function completeCodeBlock(tokens) {
|
|
const mergedRawText = mergeRawTokenText(tokens);
|
|
return marked.lexer(mergedRawText + '\n```');
|
|
}
|
|
function completeCodespan(token) {
|
|
return completeWithString(token, '`');
|
|
}
|
|
function completeStar(tokens) {
|
|
return completeWithString(tokens, '*');
|
|
}
|
|
function completeUnderscore(tokens) {
|
|
return completeWithString(tokens, '_');
|
|
}
|
|
function completeLinkTarget(tokens) {
|
|
return completeWithString(tokens, ')');
|
|
}
|
|
function completeLinkText(tokens) {
|
|
return completeWithString(tokens, '](about:blank)');
|
|
}
|
|
function completeDoublestar(tokens) {
|
|
return completeWithString(tokens, '**');
|
|
}
|
|
function completeDoubleUnderscore(tokens) {
|
|
return completeWithString(tokens, '__');
|
|
}
|
|
function completeWithString(tokens, closingString) {
|
|
const mergedRawText = mergeRawTokenText(Array.isArray(tokens) ? tokens : [tokens]);
|
|
// If it was completed correctly, this should be a single token.
|
|
// Expecting either a Paragraph or a List
|
|
return marked.lexer(mergedRawText + closingString)[0];
|
|
}
|
|
function completeTable(tokens) {
|
|
const mergedRawText = mergeRawTokenText(tokens);
|
|
const lines = mergedRawText.split('\n');
|
|
let numCols; // The number of line1 col headers
|
|
let hasSeparatorRow = false;
|
|
for (let i = 0; i < lines.length; i++) {
|
|
const line = lines[i].trim();
|
|
if (typeof numCols === 'undefined' && line.match(/^\s*\|/)) {
|
|
const line1Matches = line.match(/(\|[^\|]+)(?=\||$)/g);
|
|
if (line1Matches) {
|
|
numCols = line1Matches.length;
|
|
}
|
|
}
|
|
else if (typeof numCols === 'number') {
|
|
if (line.match(/^\s*\|/)) {
|
|
if (i !== lines.length - 1) {
|
|
// We got the line1 header row, and the line2 separator row, but there are more lines, and it wasn't parsed as a table!
|
|
// That's strange and means that the table is probably malformed in the source, so I won't try to patch it up.
|
|
return undefined;
|
|
}
|
|
// Got a line2 separator row- partial or complete, doesn't matter, we'll replace it with a correct one
|
|
hasSeparatorRow = true;
|
|
}
|
|
else {
|
|
// The line after the header row isn't a valid separator row, so the table is malformed, don't fix it up
|
|
return undefined;
|
|
}
|
|
}
|
|
}
|
|
if (typeof numCols === 'number' && numCols > 0) {
|
|
const prefixText = hasSeparatorRow ? lines.slice(0, -1).join('\n') : mergedRawText;
|
|
const line1EndsInPipe = !!prefixText.match(/\|\s*$/);
|
|
const newRawText = prefixText + (line1EndsInPipe ? '' : '|') + `\n|${' --- |'.repeat(numCols)}`;
|
|
return marked.lexer(newRawText);
|
|
}
|
|
return undefined;
|
|
}
|