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feat(expert): render mermaid diagrams in messages #9011
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,64 @@ | ||
| import DOMPurify from 'dompurify' | ||
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| // The CSS variables the diagram takes its colours from | ||
| export const THEME_VARIABLES = [ | ||
| '--pele-bg', | ||
| '--pele-fg', | ||
| '--pele-muted', | ||
| '--pele-line', | ||
| '--pele-surface', | ||
| '--pele-surface-alt', | ||
| '--pele-border', | ||
| '--pele-accent' | ||
| ] | ||
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| // The SVG is rendered by the Expert and arrives with the message, so it is untrusted markup. | ||
| // Ids are dropped because nothing in the SVG refers to them and they repeat across the diagrams on a page. | ||
| export function sanitizeDiagram (svg) { | ||
| return DOMPurify.sanitize(svg, { USE_PROFILES: { svg: true, svgFilters: true }, FORBID_ATTR: ['id'] }) | ||
| } | ||
|
|
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| function parseSvg (svg) { | ||
| const doc = new DOMParser().parseFromString(svg, 'image/svg+xml') | ||
| return doc.documentElement | ||
| } | ||
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| // Returns the diagram as standalone SVG markup with explicit pixel dimensions. The theme | ||
| // variables are written onto the SVG, as outside the page it no longer inherits them. | ||
| export function serializeSvg (svg, theme = {}) { | ||
| const el = parseSvg(svg) | ||
| const [, , width, height] = (el.getAttribute('viewBox') || '').split(/\s+/).map(Number) | ||
| if (width && height) { | ||
| el.setAttribute('width', width) | ||
| el.setAttribute('height', height) | ||
| } | ||
| el.style.maxWidth = '' | ||
| for (const [name, value] of Object.entries(theme)) { | ||
| el.style.setProperty(name, value) | ||
| } | ||
| el.setAttribute('xmlns', 'http://www.w3.org/2000/svg') | ||
| return new XMLSerializer().serializeToString(el) | ||
| } | ||
|
|
||
| export async function svgToPngBlob (svg, { scale = 2, theme = {} } = {}) { | ||
| const standalone = serializeSvg(svg, theme) | ||
| const el = parseSvg(standalone) | ||
| const width = Number(el.getAttribute('width')) | ||
| const height = Number(el.getAttribute('height')) | ||
| const image = new Image() | ||
| await new Promise((resolve, reject) => { | ||
| image.onload = resolve | ||
| image.onerror = reject | ||
| image.src = 'data:image/svg+xml;charset=utf-8,' + encodeURIComponent(standalone) | ||
| }) | ||
| const canvas = document.createElement('canvas') | ||
| canvas.width = Math.ceil(width * scale) | ||
| canvas.height = Math.ceil(height * scale) | ||
| const ctx = canvas.getContext('2d') | ||
| ctx.fillStyle = theme['--pele-bg'] || '#ffffff' | ||
| ctx.fillRect(0, 0, canvas.width, canvas.height) | ||
| ctx.drawImage(image, 0, 0, canvas.width, canvas.height) | ||
| return new Promise((resolve, reject) => { | ||
| canvas.toBlob(blob => blob ? resolve(blob) : reject(new Error('PNG export failed')), 'image/png') | ||
| }) | ||
| } |
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So while streaming,
:key="text"rebuilds the whole content every tick andupdated()re-injects the diagrams each time, so the diagram buttons don't work until streaming ends. None of my clicks on Code / export registered.Could each diagram be its own Vue component instead of going through
v-html? Then it wouldn't rebuild every tick, and we could useff-button/ff-kebab-menu, which would also fix the export buttons wrapping in the drawer on smaller screens.