2022-02-16 11:28:29 +08:00
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import {isDarkTheme} from '../utils.js';
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2022-12-26 01:17:48 +08:00
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import {makeCodeCopyButton} from './codecopy.js';
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2023-04-17 18:10:22 +08:00
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import {displayError} from './common.js';
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2022-12-26 01:17:48 +08:00
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2021-10-21 15:37:43 +08:00
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const {mermaidMaxSourceCharacters} = window.config;
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2020-08-05 03:56:37 +08:00
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2023-04-17 18:10:22 +08:00
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const iframeCss = `:root {color-scheme: normal}
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body {margin: 0; padding: 0; overflow: hidden}
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#mermaid {display: block; margin: 0 auto}`;
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2020-07-27 14:24:09 +08:00
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2021-11-16 16:16:05 +08:00
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export async function renderMermaid() {
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const els = document.querySelectorAll('.markup code.language-mermaid');
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if (!els.length) return;
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2020-07-27 14:24:09 +08:00
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2021-10-19 15:23:58 +08:00
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const {default: mermaid} = await import(/* webpackChunkName: "mermaid" */'mermaid');
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2020-07-27 14:24:09 +08:00
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2020-08-05 03:56:37 +08:00
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mermaid.initialize({
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2022-02-16 11:28:29 +08:00
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startOnLoad: false,
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theme: isDarkTheme() ? 'dark' : 'neutral',
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2020-07-27 14:24:09 +08:00
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securityLevel: 'strict',
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});
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for (const el of els) {
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2023-04-17 18:10:22 +08:00
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const pre = el.closest('pre');
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if (pre.hasAttribute('data-render-done')) continue;
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2022-02-16 11:28:29 +08:00
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2023-04-17 18:10:22 +08:00
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const source = el.textContent;
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2022-02-16 11:28:29 +08:00
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if (mermaidMaxSourceCharacters >= 0 && source.length > mermaidMaxSourceCharacters) {
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2023-04-17 18:10:22 +08:00
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displayError(pre, new Error(`Mermaid source of ${source.length} characters exceeds the maximum allowed length of ${mermaidMaxSourceCharacters}.`));
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2020-08-05 03:56:37 +08:00
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continue;
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}
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try {
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2023-03-04 13:39:07 +08:00
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await mermaid.parse(source);
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2020-08-05 03:56:37 +08:00
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} catch (err) {
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2023-04-17 18:10:22 +08:00
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displayError(pre, err);
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2020-08-05 03:56:37 +08:00
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continue;
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}
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try {
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2022-02-16 11:28:29 +08:00
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// can't use bindFunctions here because we can't cross the iframe boundary. This
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// means js-based interactions won't work but they aren't intended to work either
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2023-03-04 13:39:07 +08:00
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const {svg} = await mermaid.render('mermaid', source);
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const iframe = document.createElement('iframe');
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2023-04-17 18:10:22 +08:00
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iframe.classList.add('markup-render', 'gt-invisible');
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2023-03-04 13:39:07 +08:00
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iframe.srcdoc = `<html><head><style>${iframeCss}</style></head><body>${svg}</body></html>`;
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const mermaidBlock = document.createElement('div');
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2023-04-17 18:10:22 +08:00
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mermaidBlock.classList.add('mermaid-block', 'is-loading', 'gt-hidden');
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2023-03-04 13:39:07 +08:00
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mermaidBlock.append(iframe);
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const btn = makeCodeCopyButton();
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btn.setAttribute('data-clipboard-text', source);
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mermaidBlock.append(btn);
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2023-04-17 18:10:22 +08:00
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iframe.addEventListener('load', () => {
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pre.replaceWith(mermaidBlock);
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mermaidBlock.classList.remove('gt-hidden');
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iframe.style.height = `${iframe.contentWindow.document.body.clientHeight}px`;
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setTimeout(() => { // avoid flash of iframe background
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mermaidBlock.classList.remove('is-loading');
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iframe.classList.remove('gt-invisible');
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}, 0);
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});
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document.body.append(mermaidBlock);
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2020-08-05 03:56:37 +08:00
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} catch (err) {
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2023-04-17 18:10:22 +08:00
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displayError(pre, err);
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2020-08-05 03:56:37 +08:00
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}
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2020-07-27 14:24:09 +08:00
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}
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}
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