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const PLAINTEXT_LANG = 'plaintext';
// Transforms generated HTML back to GFM for:
// - Banzai::Filter::SyntaxHighlightFilter
// - Banzai::Filter::MathFilter
// - Banzai::Filter::MermaidFilter
// - Banzai::Filter::SuggestionFilter
export default () => ({
name: 'code_block',
schema: {
content: 'text*',
marks: '',
group: 'block',
code: true,
defining: true,
attrs: {
lang: { default: PLAINTEXT_LANG },
},
parseDOM: [
// Matches HTML generated by Banzai::Filter::SyntaxHighlightFilter, Banzai::Filter::MathFilter, Banzai::Filter::MermaidFilter, or Banzai::Filter::SuggestionFilter
{
tag: 'pre.code.highlight',
preserveWhitespace: 'full',
getAttrs: (el) => {
const lang = el.getAttribute('lang');
if (!lang || lang === '') return {};
return { lang };
},
},
// Matches HTML generated by Banzai::Filter::MathFilter,
// after being transformed by app/assets/javascripts/behaviors/markdown/render_math.js
{
tag: 'span.katex-display',
preserveWhitespace: 'full',
contentElement: 'annotation[encoding="application/x-tex"]',
attrs: { lang: 'math' },
},
// Matches HTML generated by Banzai::Filter::MermaidFilter,
// after being transformed by app/assets/javascripts/behaviors/markdown/render_mermaid.js
{
tag: 'svg.mermaid',
preserveWhitespace: 'full',
contentElement: 'text.source',
attrs: { lang: 'mermaid' },
},
// Matches HTML generated by Banzai::Filter::SuggestionFilter,
// after being transformed by app/assets/javascripts/vue_shared/components/markdown/suggestions.vue
{
tag: '.md-suggestion',
skip: true,
},
{
tag: '.md-suggestion-header',
ignore: true,
},
{
tag: '.md-suggestion-diff',
preserveWhitespace: 'full',
getContent: (el, schema) =>
[...el.querySelectorAll('.line_content.new span')].map((span) =>
schema.text(span.innerText),
),
attrs: { lang: 'suggestion' },
},
],
toDOM: (node) => ['pre', { class: 'code highlight', lang: node.attrs.lang }, ['code', 0]],
},
toMarkdown(state, node) {
if (!node.childCount) return;
const {
textContent: text,
attrs: { lang },
} = node;
// Prefixes lines with 4 spaces if the code contains a line that starts with triple backticks
if (lang === PLAINTEXT_LANG && text.match(/^```/gm)) {
state.wrapBlock(' ', null, node, () => state.text(text, false));
return;
}
state.write('```');
if (lang !== PLAINTEXT_LANG) state.write(lang);
state.ensureNewLine();
state.text(text, false);
state.ensureNewLine();
state.write('```');
state.closeBlock(node);
},
});
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