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import MarkdownIt from 'markdown-it';
import Token from 'markdown-it/lib/token';
import iterator from 'markdown-it-for-inline';
import {CheckboxPlugin} from './CheckboxPlugin';
import AnchorPlugin from 'markdown-it-anchor';
import slugify from 'slugify';
import TOCPlugin from 'markdown-it-table-of-contents';
import VideoPlugin from './VideoPlugin';
import PreamblePlugin from 'markdown-it-github-preamble';
import morphdom from 'morphdom';
import 'katex/dist/katex.min.css';
import 'highlight.js/styles/github.css';
const slugifyHeading = name => 'editor/' + slugify(name).toLowerCase();
export type PluginChecker = (text: string) => boolean;
export interface PluginMap {
[name: string]: {
checker: PluginChecker;
module: () => Promise<any>;
loaded?: boolean
}
}
function loadKaTeX() {
return Promise.all([
import('katex'),
import('markdown-it-texmath'),
]).then(([katex, {default: texmath}]) => {
texmath.use(katex);
return texmath;
});
}
function loadMermaid() {
return import('./MermaidPlugin').then(module => module.MermaidPlugin);
}
function loadHighlight() {
return import('markdown-it-highlightjs').then(module => module.default);
}
export class Renderer {
md: MarkdownIt;
plugins: PluginMap = {
'mermaid': {
checker: text => text.match(/(gantt|sequenceDiagram|graph (?:TB|BT|RL|LR|TD))/) !== null,
module: loadMermaid
},
'highlight.js': {
checker: text => text.indexOf('```') !== -1,
module: loadHighlight
},
'katex': {
checker: text => text.indexOf('$') !== -1,
module: loadKaTeX
}
};
constructor(readonly: boolean = false) {
this.md = new MarkdownIt({
linkify: true
});
this.md.use(CheckboxPlugin, {
checkboxClass: 'checkbox',
readonly: readonly
});
this.md.use(AnchorPlugin, {
slugify: slugifyHeading
});
this.md.use(TOCPlugin, {
slugify: slugifyHeading
});
this.md.use(PreamblePlugin);
this.md.use(VideoPlugin);
this.md.use(iterator, 'url_new_win', 'link_open', (tokens: Token[], idx: number) => {
const href = tokens[idx].attrGet('href') as string;
if (href[0] !== '#') {
tokens[idx].attrPush(['target', '_blank']);
tokens[idx].attrPush(['rel', 'noopener']);
}
tokens[idx].attrSet('href', this.getLinkUrl(href))
});
this.md.use(iterator, 'internal_image_link', 'image', (tokens: Token[], idx: number) => {
tokens[idx].attrSet('src', this.getImageUrl(tokens[idx].attrGet('src') as string));
});
function injectLineNumbers(tokens, idx, options, env, slf) {
if (tokens[idx].map && tokens[idx].level === 0) {
const line = tokens[idx].map[0];
tokens[idx].attrJoin('class', 'line');
tokens[idx].attrSet('data-line', String(line));
}
return slf.renderToken(tokens, idx, options, env, slf);
}
this.md.renderer.rules.paragraph_open =
this.md.renderer.rules.heading_open =
this.md.renderer.rules.heading_open =
injectLineNumbers;
}
getLinkUrl(path: string): string {
if (path[0] === '#') {
return '#' + slugifyHeading(path.substr(1));
}
return path;
}
getImageUrl(path: string): string {
if (!path || path.indexOf('.') === -1) {
return path;
}
if (path.indexOf('://') !== -1) {
return path;
} else {
if (path.substr(0, 1) !== '/') {
if (OCA.Files_Texteditor.file && OCA.Files_Texteditor.file.dir) {
path = OCA.Files_Texteditor.file.dir + '/' + path;
} else if (OCA.Files.App && OCA.Files.App.fileList._currentDirectory) {
path = OCA.Files.App.fileList._currentDirectory + '/' + path;
}
}
return OC.linkToRemote('files' + path.replace(/\/\/+/g, '/'));
}
}
renderText(text: string, element): Promise<void> {
return this.loadPlugins(text).then(() => {
const html = this.md.render(text);
morphdom(element[0], `<div>${html}</div>`, {
childrenOnly: true
});
}
);
}
loadPlugins(text: string) {
return Promise.all(Object.keys(this.plugins)
.map(pluginName => {
const plugin = this.plugins[pluginName];
if (!plugin.loaded && plugin.checker(text)) {
plugin.loaded = true;
return plugin.module().then(plugin => {
this.md.use(plugin);
});
}
})
);
}
}
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