import {isDarkTheme} from '../utils.js'; const {mermaidMaxSourceCharacters} = window.config; const iframeCss = ` :root {color-scheme: normal} body {margin: 0; padding: 0} #mermaid {display: block; margin: 0 auto} `; function displayError(el, err) { el.closest('pre').classList.remove('is-loading'); const errorNode = document.createElement('div'); errorNode.setAttribute('class', 'ui message error markup-block-error mono'); errorNode.textContent = err.str || err.message || String(err); el.closest('pre').before(errorNode); } export async function renderMermaid() { const els = document.querySelectorAll('.markup code.language-mermaid'); if (!els.length) return; const {default: mermaid} = await import(/* webpackChunkName: "mermaid" */'mermaid'); mermaid.initialize({ startOnLoad: false, theme: isDarkTheme() ? 'dark' : 'neutral', securityLevel: 'strict', }); for (const el of els) { const source = el.textContent; if (mermaidMaxSourceCharacters >= 0 && source.length > mermaidMaxSourceCharacters) { displayError(el, new Error(`Mermaid source of ${source.length} characters exceeds the maximum allowed length of ${mermaidMaxSourceCharacters}.`)); continue; } let valid; try { valid = mermaid.parse(source); } catch (err) { displayError(el, err); } if (!valid) { el.closest('pre').classList.remove('is-loading'); continue; } try { // can't use bindFunctions here because we can't cross the iframe boundary. This // means js-based interactions won't work but they aren't intended to work either mermaid.mermaidAPI.render('mermaid', source, (svgStr) => { const heightStr = (svgStr.match(/viewBox="(.+?)"/) || ['', ''])[1].split(/\s+/)[3]; if (!heightStr) return displayError(el, new Error('Could not determine chart height')); const iframe = document.createElement('iframe'); iframe.classList.add('markup-render'); iframe.sandbox = 'allow-scripts'; iframe.style.height = `${Math.ceil(parseFloat(heightStr))}px`; iframe.srcdoc = `<html><head><style>${iframeCss}</style></head><body>${svgStr}</body></html>`; el.closest('pre').replaceWith(iframe); }); } catch (err) { displayError(el, err); } } }