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