Various Mermaid improvements (#18776)
* Various Mermaid improvments - Render into iframe for improved security - Use built-in dark theme instead of color inversion - Remove flexbox attributes, resulting in more consistent size rendering - Update API usage and update to latest version * restart ci * misc tweaks * remove unneccesary declaration * make it work without allow-same-origin, add loading=lazy * remove loading attribute, does not seem to work * rename variable * skip roundtrip to DOM for rendering * don't guess chart height * update comment to make it clear it's intentional * tweak * replace deprecated 'scrolling' property * remove unused css file Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
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9 changed files with 50 additions and 50 deletions
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@ -1,5 +1,11 @@
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import {isDarkTheme} from '../utils.js';
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const {mermaidMaxSourceCharacters} = window.config;
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const iframeCss = `
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body {margin: 0; padding: 0}
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#mermaid {display: block; margin: 0 auto}
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`;
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function displayError(el, err) {
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el.closest('pre').classList.remove('is-loading');
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const errorNode = document.createElement('div');
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@ -15,26 +21,22 @@ export async function renderMermaid() {
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const {default: mermaid} = await import(/* webpackChunkName: "mermaid" */'mermaid');
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mermaid.initialize({
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mermaid: {
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startOnLoad: false,
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},
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flowchart: {
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useMaxWidth: true,
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htmlLabels: false,
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},
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theme: 'neutral',
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startOnLoad: false,
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theme: isDarkTheme() ? 'dark' : 'neutral',
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securityLevel: 'strict',
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});
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for (const el of els) {
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if (mermaidMaxSourceCharacters >= 0 && el.textContent.length > mermaidMaxSourceCharacters) {
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displayError(el, new Error(`Mermaid source of ${el.textContent.length} characters exceeds the maximum allowed length of ${mermaidMaxSourceCharacters}.`));
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const source = el.textContent;
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if (mermaidMaxSourceCharacters >= 0 && source.length > mermaidMaxSourceCharacters) {
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displayError(el, new Error(`Mermaid source of ${source.length} characters exceeds the maximum allowed length of ${mermaidMaxSourceCharacters}.`));
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continue;
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}
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let valid;
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try {
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valid = mermaid.parse(el.textContent);
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valid = mermaid.parse(source);
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} catch (err) {
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displayError(el, err);
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}
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@ -45,10 +47,17 @@ export async function renderMermaid() {
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}
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try {
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mermaid.init(undefined, el, (id) => {
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const svg = document.getElementById(id);
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svg.classList.add('mermaid-chart');
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svg.closest('pre').replaceWith(svg);
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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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mermaid.mermaidAPI.render('mermaid', source, (svgStr) => {
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const heightStr = (svgStr.match(/height="(.+?)"/) || [])[1];
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if (!heightStr) return displayError(el, new Error('Could not determine chart height'));
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const iframe = document.createElement('iframe');
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iframe.classList.add('markup-render');
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iframe.sandbox = 'allow-scripts';
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iframe.style.height = `${Math.ceil(parseFloat(heightStr))}px`;
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iframe.srcdoc = `<html><head><style>${iframeCss}</style></head><body>${svgStr}</body></html>`;
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el.closest('pre').replaceWith(iframe);
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});
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} catch (err) {
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displayError(el, err);
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@ -6,6 +6,7 @@
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/* other variables */
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--border-radius: .28571429rem;
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--opacity-disabled: .55;
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--height-loading: 12rem;
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--color-primary: #4183c4;
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--color-primary-dark-1: #3876b3;
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--color-primary-dark-2: #31699f;
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@ -30,7 +30,7 @@
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.markup pre.is-loading,
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.editor-loading.is-loading {
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height: 12rem;
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height: var(--height-loading);
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}
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@keyframes fadein {
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@ -10,7 +10,6 @@
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@import "./features/codeeditor.less";
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@import "./features/projects.less";
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@import "./markup/content.less";
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@import "./markup/mermaid.less";
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@import "./markup/codecopy.less";
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@import "./code/linebutton.less";
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@ -536,6 +536,14 @@
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}
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}
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.markup-render {
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display: block;
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border: none;
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width: 100%;
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height: var(--height-loading); // actual height is set in JS after loading
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overflow: hidden;
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}
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.markup-block-error {
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margin-bottom: 0 !important;
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border-bottom-left-radius: 0 !important;
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@ -1,13 +0,0 @@
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.mermaid-chart {
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display: flex;
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justify-content: center;
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align-items: center;
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padding: 1rem;
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margin: 1rem auto;
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height: auto;
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}
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/* mermaid's errorRenderer seems to unavoidably spew stuff into <body>, hide it */
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body > div[id*="mermaid-"] {
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display: none !important;
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}
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@ -455,10 +455,6 @@ img[src$="/img/matrix.svg"] {
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filter: invert(80%);
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}
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.mermaid-chart {
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filter: invert(84%) hue-rotate(180deg);
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}
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.is-loading::after {
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border-color: #4a4c58 #4a4c58 #d7d7da #d7d7da;
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}
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