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joplin/packages/lib/HtmlToMd.ts

69 lines
2.4 KiB
TypeScript

const TurndownService = require('@joplin/turndown');
const turndownPluginGfm = require('@joplin/turndown-plugin-gfm').gfm;
import markdownUtils from './markdownUtils';
const pdfUrlRegex = /[\s\S]*?\.pdf$/i;
export interface ParseOptions {
anchorNames?: string[];
preserveImageTagsWithSize?: boolean;
baseUrl?: string;
disableEscapeContent?: boolean;
convertEmbeddedPdfsToLinks?: boolean;
}
export default class HtmlToMd {
public parse(html: string, options: ParseOptions = {}) {
const turndownOpts: any = {
headingStyle: 'atx',
anchorNames: options.anchorNames ? options.anchorNames.map(n => n.trim().toLowerCase()) : [],
codeBlockStyle: 'fenced',
preserveImageTagsWithSize: !!options.preserveImageTagsWithSize,
bulletListMarker: '-',
emDelimiter: '*',
strongDelimiter: '**',
// If soft-breaks are enabled, lines need to end with two or more spaces for
// trailing <br/>s to render. See
// https://github.com/laurent22/joplin/issues/8430
br: ' ',
disableEscapeContent: 'disableEscapeContent' in options ? options.disableEscapeContent : false,
};
if (options.convertEmbeddedPdfsToLinks) {
// Turndown ignores empty <object> tags, so we need to handle this case seperately
// https://github.com/mixmark-io/turndown/issues/293#issuecomment-588984202
turndownOpts.blankReplacement = (content: string, node: any) => {
if (node.matches('object')) {
return pdfRule.replacement(content, node, {});
}
return '\n\n';
};
}
const turndown = new TurndownService(turndownOpts);
turndown.use(turndownPluginGfm);
turndown.remove('script');
turndown.remove('style');
const pdfRule = {
filter: ['embed', 'object'],
replacement: function(_content: string, node: any, _options: any) {
// We are setting embedded_pdf as name so that we can later distingish them from normal links and create resources for them.
if (node.matches('embed') && node.getAttribute('src') && pdfUrlRegex.test(node.getAttribute('src'))) {
return `[embedded_pdf](${node.getAttribute('src')})`;
} else if (node.matches('object') && node.getAttribute('data') && pdfUrlRegex.test(node.getAttribute('data'))) {
return `[embedded_pdf](${node.getAttribute('data')})`;
}
return '';
},
};
if (options.convertEmbeddedPdfsToLinks) {
turndown.addRule('pdf', pdfRule);
}
let md = turndown.turndown(html);
if (options.baseUrl) md = markdownUtils.prependBaseUrl(md, options.baseUrl);
return md;
}
}