From 4c8ea44300edc3a2a2482e7f4d9a56e3bcbb34d5 Mon Sep 17 00:00:00 2001 From: Jeff Emmett Date: Wed, 1 Apr 2026 12:21:36 -0700 Subject: [PATCH] feat: mermaid-animator with HTTP API, WebSocket server, and Docker deployment Animated GIF generator for Mermaid diagrams with three animation modes (progressive, template, sequence). Includes POST /api/render REST endpoint with CORS for cross-origin canvas integration, plus WebSocket server for real-time preview. Dockerized with Playwright Chromium for server-side rendering. Co-Authored-By: Claude Opus 4.6 --- .dockerignore | 4 + .gitignore | 5 + Dockerfile | 42 + docker-compose.yml | 21 + package-lock.json | 2469 ++++++++++++++++++++++++++++++++++ package.json | 34 + src/animators/index.ts | 17 + src/animators/progressive.ts | 53 + src/animators/sequence.ts | 25 + src/animators/template.ts | 60 + src/cli.ts | 92 ++ src/encoder/gif.ts | 66 + src/gifenc.d.ts | 57 + src/parser/mermaid-ast.ts | 163 +++ src/renderer/index.ts | 232 ++++ src/server/index.ts | 210 +++ src/server/static/editor.js | 38 + src/server/static/index.html | 70 + src/server/static/preview.js | 53 + src/types.ts | 42 + test/fixtures/sequence.mmd | 15 + test/fixtures/simple.mmd | 5 + test/fixtures/template.mmd | 4 + tsconfig.json | 17 + 24 files changed, 3794 insertions(+) create mode 100644 .dockerignore create mode 100644 .gitignore create mode 100644 Dockerfile create mode 100644 docker-compose.yml create mode 100644 package-lock.json create mode 100644 package.json create mode 100644 src/animators/index.ts create mode 100644 src/animators/progressive.ts create mode 100644 src/animators/sequence.ts create mode 100644 src/animators/template.ts create mode 100644 src/cli.ts create mode 100644 src/encoder/gif.ts create mode 100644 src/gifenc.d.ts create mode 100644 src/parser/mermaid-ast.ts create mode 100644 src/renderer/index.ts create mode 100644 src/server/index.ts create mode 100644 src/server/static/editor.js create mode 100644 src/server/static/index.html create mode 100644 src/server/static/preview.js create mode 100644 src/types.ts create mode 100644 test/fixtures/sequence.mmd create mode 100644 test/fixtures/simple.mmd create mode 100644 test/fixtures/template.mmd create mode 100644 tsconfig.json diff --git a/.dockerignore b/.dockerignore new file mode 100644 index 0000000..c9f95b8 --- /dev/null +++ b/.dockerignore @@ -0,0 +1,4 @@ +node_modules +dist +*.gif +.git diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..35801a8 --- /dev/null +++ b/.gitignore @@ -0,0 +1,5 @@ +node_modules/ +dist/ +*.gif +*.png +.DS_Store diff --git a/Dockerfile b/Dockerfile new file mode 100644 index 0000000..39771e1 --- /dev/null +++ b/Dockerfile @@ -0,0 +1,42 @@ +FROM node:22-bookworm-slim + +# Install Playwright Chromium dependencies +RUN apt-get update && apt-get install -y --no-install-recommends \ + libnss3 \ + libnspr4 \ + libatk1.0-0 \ + libatk-bridge2.0-0 \ + libcups2 \ + libdrm2 \ + libdbus-1-3 \ + libxkbcommon0 \ + libatspi2.0-0 \ + libxcomposite1 \ + libxdamage1 \ + libxfixes3 \ + libxrandr2 \ + libgbm1 \ + libpango-1.0-0 \ + libcairo2 \ + libasound2 \ + libx11-xcb1 \ + fonts-liberation \ + fonts-noto-color-emoji \ + && rm -rf /var/lib/apt/lists/* + +WORKDIR /app + +COPY package*.json ./ +RUN npm ci --production=false + +# Install Playwright Chromium browser +RUN npx playwright install chromium + +COPY tsconfig.json ./ +COPY src/ ./src/ + +RUN npm run build + +EXPOSE 3999 + +CMD ["node", "dist/cli.js", "preview", "--port", "3999"] diff --git a/docker-compose.yml b/docker-compose.yml new file mode 100644 index 0000000..3f4afc3 --- /dev/null +++ b/docker-compose.yml @@ -0,0 +1,21 @@ +services: + mermaid-animator: + build: . + container_name: mermaid-animator + restart: unless-stopped + deploy: + resources: + limits: + memory: 2G + networks: + - proxy + labels: + - "traefik.enable=true" + - "traefik.http.routers.mermaid-animator.rule=Host(`mermaid.jeffemmett.com`)" + - "traefik.http.routers.mermaid-animator.entrypoints=websecure" + - "traefik.http.routers.mermaid-animator.tls.certresolver=letsencrypt" + - "traefik.http.services.mermaid-animator.loadbalancer.server.port=3999" + +networks: + proxy: + external: true diff --git a/package-lock.json b/package-lock.json new file mode 100644 index 0000000..94ab013 --- /dev/null +++ b/package-lock.json @@ -0,0 +1,2469 @@ +{ + "name": "mermaid-animator", + "version": "0.1.0", + "lockfileVersion": 3, + "requires": true, + "packages": { + "": { + "name": 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"mermaid-animator": "./dist/cli.js" + }, + "scripts": { + "build": "tsc", + "dev": "tsx src/cli.ts" + }, + "keywords": [ + "mermaid", + "animation", + "gif", + "diagram" + ], + "license": "MIT", + "dependencies": { + "commander": "^13.1.0", + "gifenc": "^1.0.3", + "mermaid-isomorphic": "^3.1.0", + "playwright": "^1.59.1", + "sharp": "^0.33.5", + "ws": "^8.18.0" + }, + "devDependencies": { + "@types/node": "^22.13.0", + "@types/ws": "^8.5.13", + "tsx": "^4.19.0", + "typescript": "^5.7.0" + } +} diff --git a/src/animators/index.ts b/src/animators/index.ts new file mode 100644 index 0000000..4a05ac7 --- /dev/null +++ b/src/animators/index.ts @@ -0,0 +1,17 @@ +import type { Animator, AnimationMode } from '../types.js'; +import { ProgressiveAnimator } from './progressive.js'; +import { TemplateAnimator } from './template.js'; +import { SequenceAnimator } from './sequence.js'; + +export function getAnimator(mode: AnimationMode): Animator { + switch (mode) { + case 'progressive': + return new ProgressiveAnimator(); + case 'template': + return new TemplateAnimator(); + case 'sequence': + return new SequenceAnimator(); + default: + throw new Error(`Unknown animation mode: ${mode}`); + } +} diff --git a/src/animators/progressive.ts b/src/animators/progressive.ts new file mode 100644 index 0000000..e3271b6 --- /dev/null +++ b/src/animators/progressive.ts @@ -0,0 +1,53 @@ +import type { Animator, AnimationResult, ProgressiveResult } from '../types.js'; +import { parseDiagram, generateProgressiveFrames } from '../parser/mermaid-ast.js'; + +export class ProgressiveAnimator implements Animator { + /** + * Fallback: generates separate mermaid code per frame (causes layout shifts). + * Used by template/sequence modes via the generic pipeline. + */ + parse(input: string, delay: number): AnimationResult { + const parsed = parseDiagram(input); + const frameCodes = generateProgressiveFrames(parsed); + return { + frames: frameCodes.map((code) => ({ mermaidCode: code, delay })), + }; + } + + /** + * Stable-layout progressive mode: returns the full diagram code + * plus per-frame visibility info (which nodes should be shown). + */ + parseStable(input: string, delay: number): ProgressiveResult { + const parsed = parseDiagram(input); + const { header, directives, elements } = parsed; + + // Build the full diagram code (all elements + directives) + const directiveBlock = directives.length > 0 ? '\n' + directives.join('\n') : ''; + const allLines = elements.map((e) => e.line); + const fullCode = header + '\n' + allLines.join('\n') + directiveBlock; + + // Build cumulative visibility — one node at a time. + // Edges appear automatically when both endpoints become visible. + const frameVisibility = []; + const cumulativeNodes = new Set(); + + for (const element of elements) { + for (const name of element.nodeNames) { + if (!cumulativeNodes.has(name)) { + cumulativeNodes.add(name); + frameVisibility.push({ + visibleNodes: new Set(cumulativeNodes), + }); + } + } + } + + // If no elements, single frame with everything visible + if (frameVisibility.length === 0) { + frameVisibility.push({ visibleNodes: new Set() }); + } + + return { fullCode, frameVisibility, delay }; + } +} diff --git a/src/animators/sequence.ts b/src/animators/sequence.ts new file mode 100644 index 0000000..2fde6b6 --- /dev/null +++ b/src/animators/sequence.ts @@ -0,0 +1,25 @@ +import type { Animator, AnimationResult } from '../types.js'; + +/** + * Sequence mode: multiple diagrams separated by --- + * Each diagram becomes one frame. + */ +export class SequenceAnimator implements Animator { + parse(input: string, delay: number): AnimationResult { + const diagrams = input + .split(/^---$/m) + .map((s) => s.trim()) + .filter((s) => s.length > 0); + + if (diagrams.length === 0) { + throw new Error('No diagrams found in sequence input'); + } + + return { + frames: diagrams.map((code) => ({ + mermaidCode: code, + delay, + })), + }; + } +} diff --git a/src/animators/template.ts b/src/animators/template.ts new file mode 100644 index 0000000..d40d927 --- /dev/null +++ b/src/animators/template.ts @@ -0,0 +1,60 @@ +import type { Animator, AnimationResult } from '../types.js'; + +/** + * Template substitution mode. + * Syntax: {[frameIndex value |frameIndex value |...]} + * Each frame index gets its corresponding value substituted. + */ +export class TemplateAnimator implements Animator { + parse(input: string, delay: number): AnimationResult { + // Find all template markers and determine frame count + const markerRegex = /\{\[([^\]]+)\]\}/g; + const markers: { full: string; options: Map }[] = []; + let maxFrame = 0; + + let match; + while ((match = markerRegex.exec(input)) !== null) { + const content = match[1]; + const options = new Map(); + + // Parse "frameIndex value" pairs separated by | + const parts = content.split('|').map((s) => s.trim()); + for (const part of parts) { + const spaceIdx = part.indexOf(' '); + if (spaceIdx === -1) continue; + const idx = parseInt(part.substring(0, spaceIdx), 10); + const value = part.substring(spaceIdx + 1).trim(); + if (!isNaN(idx)) { + options.set(idx, value); + maxFrame = Math.max(maxFrame, idx); + } + } + + markers.push({ full: match[0], options }); + } + + if (markers.length === 0) { + return { frames: [{ mermaidCode: input, delay }] }; + } + + // Generate one frame per index + const frames = []; + for (let frameIdx = 0; frameIdx <= maxFrame; frameIdx++) { + let code = input; + for (const marker of markers) { + // Use the value for this frame index, or the closest lower one + let value = ''; + for (let j = frameIdx; j >= 0; j--) { + if (marker.options.has(j)) { + value = marker.options.get(j)!; + break; + } + } + code = code.replace(marker.full, value); + } + frames.push({ mermaidCode: code, delay }); + } + + return { frames }; + } +} diff --git a/src/cli.ts b/src/cli.ts new file mode 100644 index 0000000..4a09972 --- /dev/null +++ b/src/cli.ts @@ -0,0 +1,92 @@ +#!/usr/bin/env node +import { Command } from 'commander'; +import { readFileSync, writeFileSync } from 'fs'; +import { getAnimator } from './animators/index.js'; +import { ProgressiveAnimator } from './animators/progressive.js'; +import { renderFrames, renderStableProgressiveFrames } from './renderer/index.js'; +import { encodeGif } from './encoder/gif.js'; +import type { AnimationMode, RenderOptions } from './types.js'; + +const program = new Command(); + +program + .name('mermaid-animator') + .description('Animated GIF generator for Mermaid diagrams') + .version('0.1.0'); + +program + .command('render') + .description('Render a Mermaid diagram to an animated GIF') + .argument('', 'Path to .mmd file') + .option('-o, --output ', 'Output GIF path', 'output.gif') + .option('-m, --mode ', 'Animation mode: progressive, template, sequence', 'progressive') + .option('-d, --delay ', 'Delay between frames in ms', '800') + .option('-w, --width ', 'Diagram width', '800') + .option('-t, --theme ', 'Mermaid theme: default, dark, forest, neutral', 'default') + .option('--bg ', 'Background color', 'white') + .action(async (input: string, opts: Record) => { + try { + const mmdContent = readFileSync(input, 'utf-8'); + const mode = opts.mode as AnimationMode; + const delay = parseInt(opts.delay, 10); + + console.log(`Mode: ${mode}, Delay: ${delay}ms`); + + const renderOpts: RenderOptions = { + width: parseInt(opts.width, 10), + theme: opts.theme as RenderOptions['theme'], + backgroundColor: opts.bg, + }; + + let pngBuffers: Buffer[]; + + if (mode === 'progressive') { + // Stable-layout progressive: render full diagram once, hide elements per frame + const animator = new ProgressiveAnimator(); + const progressive = animator.parseStable(mmdContent, delay); + console.log(`Generated ${progressive.frameVisibility.length} frames (stable layout)`); + + console.log('Rendering frames...'); + pngBuffers = await renderStableProgressiveFrames( + progressive.fullCode, + progressive.frameVisibility, + renderOpts + ); + } else { + // Template/sequence: render each frame independently + const animator = getAnimator(mode); + const result = animator.parse(mmdContent, delay); + console.log(`Generated ${result.frames.length} frames`); + + console.log('Rendering frames...'); + pngBuffers = await renderFrames( + result.frames.map((f) => f.mermaidCode), + renderOpts + ); + } + + // Encode to GIF + console.log('Encoding GIF...'); + const gif = await encodeGif(pngBuffers, { delay }); + + writeFileSync(opts.output, gif); + console.log(`Written: ${opts.output} (${gif.length} bytes)`); + process.exit(0); + } catch (err) { + console.error('Error:', err instanceof Error ? err.message : err); + process.exit(1); + } + }); + +program + .command('preview') + .description('Launch web preview with live editor') + .argument('[input]', 'Optional .mmd file to load') + .option('-p, --port ', 'Server port', '3999') + .action(async (input: string | undefined, opts: Record) => { + const { startServer } = await import('./server/index.js'); + const initialCode = input ? readFileSync(input, 'utf-8') : ''; + await startServer(parseInt(opts.port, 10), initialCode); + }); + +program.parse(); diff --git a/src/encoder/gif.ts b/src/encoder/gif.ts new file mode 100644 index 0000000..bd838ae --- /dev/null +++ b/src/encoder/gif.ts @@ -0,0 +1,66 @@ +import sharp from 'sharp'; +import gifenc from 'gifenc'; +const { GIFEncoder, quantize, applyPalette } = gifenc; + +interface EncodeOptions { + delay: number; // ms per frame + repeat?: number; // 0 = loop forever, -1 = no loop +} + +export async function encodeGif( + pngBuffers: Buffer[], + options: EncodeOptions +): Promise { + if (pngBuffers.length === 0) { + throw new Error('No frames to encode'); + } + + // Decode all PNGs and get their dimensions + const frames = await Promise.all( + pngBuffers.map(async (buf) => { + const img = sharp(buf); + const meta = await img.metadata(); + return { img, width: meta.width!, height: meta.height! }; + }) + ); + + // Normalize all frames to the same dimensions (max width/height, white padded) + const maxWidth = Math.max(...frames.map((f) => f.width)); + const maxHeight = Math.max(...frames.map((f) => f.height)); + + const rgbaFrames = await Promise.all( + frames.map(async ({ img, width, height }) => { + let pipeline = img; + if (width !== maxWidth || height !== maxHeight) { + // Extend with white background to match max dimensions + pipeline = pipeline.extend({ + top: 0, + bottom: maxHeight - height, + left: 0, + right: maxWidth - width, + background: { r: 255, g: 255, b: 255, alpha: 1 }, + }); + } + return pipeline.ensureAlpha().raw().toBuffer(); + }) + ); + + // Encode to GIF + const gif = GIFEncoder(); + + for (const rgba of rgbaFrames) { + // Convert RGBA buffer to Uint8Array for quantization + const data = new Uint8Array(rgba.buffer, rgba.byteOffset, rgba.byteLength); + const palette = quantize(data, 256); + const index = applyPalette(data, palette); + + gif.writeFrame(index, maxWidth, maxHeight, { + palette, + delay: options.delay, + repeat: options.repeat ?? 0, + }); + } + + gif.finish(); + return gif.bytesView(); +} diff --git a/src/gifenc.d.ts b/src/gifenc.d.ts new file mode 100644 index 0000000..ffb43fa --- /dev/null +++ b/src/gifenc.d.ts @@ -0,0 +1,57 @@ +declare module 'gifenc' { + interface GIFEncoderInstance { + writeFrame( + index: Uint8Array, + width: number, + height: number, + options?: { + palette?: number[][]; + delay?: number; + repeat?: number; + transparent?: boolean; + transparentIndex?: number; + dispose?: number; + first?: boolean; + colorDepth?: number; + } + ): void; + finish(): void; + bytes(): Uint8Array; + bytesView(): Uint8Array; + reset(): void; + readonly buffer: ArrayBuffer; + } + + interface Gifenc { + GIFEncoder(): GIFEncoderInstance; + quantize( + data: Uint8Array, + maxColors: number, + options?: { + format?: 'rgb565' | 'rgb444' | 'rgba4444'; + oneBitAlpha?: boolean | number; + clearAlpha?: boolean; + clearAlphaColor?: number; + clearAlphaThreshold?: number; + } + ): number[][]; + applyPalette( + data: Uint8Array, + palette: number[][], + format?: 'rgb565' | 'rgb444' | 'rgba4444' + ): Uint8Array; + nearestColorIndex(palette: number[][], color: number[]): number; + prequantize( + data: Uint8Array, + options?: { roundRGB?: number; roundAlpha?: number; oneBitAlpha?: boolean | number } + ): void; + snapColorsToPalette( + palette: number[][], + knownColors: number[][], + threshold?: number + ): void; + } + + const gifenc: Gifenc; + export default gifenc; +} diff --git a/src/parser/mermaid-ast.ts b/src/parser/mermaid-ast.ts new file mode 100644 index 0000000..91e75c3 --- /dev/null +++ b/src/parser/mermaid-ast.ts @@ -0,0 +1,163 @@ +/** + * Line-level tokenizer for Mermaid flowchart/graph diagrams. + * Parses the diagram into a header, directives (classDef/style/linkStyle), + * and elements (nodes, edges, subgraphs) for progressive reveal. + */ + +export interface ParsedDiagram { + header: string; // e.g. "graph TD" or "flowchart LR" + directives: string[]; // classDef, style, linkStyle — always included in every frame + elements: ElementInfo[]; // nodes/edges/subgraphs to reveal progressively +} + +export interface ElementInfo { + line: string; // original source line(s) + nodeNames: string[]; // node IDs introduced by this element +} + +const DIRECTIVE_PATTERNS = [ + /^\s*classDef\s/, + /^\s*class\s/, + /^\s*style\s/, + /^\s*linkStyle\s/, + /^\s*%%/, + /^\s*click\s/, +]; + +const HEADER_PATTERN = /^\s*(graph|flowchart|sequenceDiagram|classDiagram|stateDiagram|erDiagram|gantt|pie|gitGraph|journey|mindmap|timeline|sankey|xychart|block)/; + +const KEYWORDS = new Set([ + 'graph', 'flowchart', 'TD', 'TB', 'BT', 'RL', 'LR', + 'subgraph', 'end', 'classDef', 'class', 'style', 'linkStyle', + 'click', 'direction', 'true', 'false', +]); + +function isDirective(line: string): boolean { + return DIRECTIVE_PATTERNS.some((p) => p.test(line)); +} + +function isBlank(line: string): boolean { + return line.trim() === ''; +} + +/** + * Extract node names from a mermaid source line. + * Strips shape content ([text], {text}, etc.) and edge labels (|text|), + * then finds word tokens that match known SVG node names. + */ +export function extractNodeNames(line: string): string[] { + let cleaned = line; + // Remove quoted strings + cleaned = cleaned.replace(/"[^"]*"/g, ' '); + // Remove arrow operators FIRST (before shape removal, to avoid > in --> matching asymmetric shapes) + cleaned = cleaned.replace(/[-.=~]{2,}>?/g, ' '); + cleaned = cleaned.replace(/<[-.=~]{2,}/g, ' '); + // Remove edge labels |text| + cleaned = cleaned.replace(/\|[^|]*\|/g, ' '); + // Remove shape content (order matters: compound shapes first) + cleaned = cleaned.replace(/\(\[.*?\]\)/g, ' '); + cleaned = cleaned.replace(/\[\[.*?\]\]/g, ' '); + cleaned = cleaned.replace(/\(\(.*?\)\)/g, ' '); + cleaned = cleaned.replace(/\[.*?\]/g, ' '); + cleaned = cleaned.replace(/\(.*?\)/g, ' '); + cleaned = cleaned.replace(/\{.*?\}/g, ' '); + // Asymmetric shape: ID>text] — only match when preceded by a word char + cleaned = cleaned.replace(/(?<=\w)>.*?\]/g, ' '); + + // Extract word tokens + const tokens = cleaned.match(/\b([A-Za-z_][\w]*)\b/g) || []; + return [...new Set(tokens.filter((t) => !KEYWORDS.has(t)))]; +} + +export function parseDiagram(code: string): ParsedDiagram { + const lines = code.split('\n'); + let header = ''; + const directives: string[] = []; + const elements: ElementInfo[] = []; + + let i = 0; + + // Find header line + while (i < lines.length) { + const line = lines[i]; + if (isBlank(line)) { + i++; + continue; + } + if (HEADER_PATTERN.test(line)) { + header = line; + i++; + break; + } + if (line.trim().startsWith('%%{')) { + directives.push(line); + i++; + continue; + } + header = line; + i++; + break; + } + + // Parse remaining lines into directives and elements + while (i < lines.length) { + const line = lines[i]; + + if (isBlank(line)) { + i++; + continue; + } + + if (isDirective(line)) { + directives.push(line); + i++; + continue; + } + + // Handle subgraph blocks as single elements + if (/^\s*subgraph\s/.test(line)) { + const subgraphLines: string[] = [line]; + i++; + let depth = 1; + while (i < lines.length && depth > 0) { + const subLine = lines[i]; + subgraphLines.push(subLine); + if (/^\s*subgraph\s/.test(subLine)) depth++; + if (/^\s*end\s*$/.test(subLine.trim())) depth--; + i++; + } + const fullLine = subgraphLines.join('\n'); + const nodeNames = subgraphLines.flatMap(extractNodeNames); + elements.push({ line: fullLine, nodeNames: [...new Set(nodeNames)] }); + continue; + } + + // Regular line: node, edge, or other content + elements.push({ line, nodeNames: extractNodeNames(line) }); + i++; + } + + return { header, directives, elements }; +} + +/** + * Generate progressive frame codes from a parsed diagram. + * Each frame adds one more element while always including directives. + */ +export function generateProgressiveFrames(parsed: ParsedDiagram): string[] { + const { header, directives, elements } = parsed; + const frames: string[] = []; + const directiveBlock = directives.length > 0 ? '\n' + directives.join('\n') : ''; + + for (let i = 0; i < elements.length; i++) { + const visibleElements = elements.slice(0, i + 1).map((e) => e.line); + const frame = header + '\n' + visibleElements.join('\n') + directiveBlock; + frames.push(frame); + } + + if (frames.length === 0) { + frames.push(header + directiveBlock); + } + + return frames; +} diff --git a/src/renderer/index.ts b/src/renderer/index.ts new file mode 100644 index 0000000..0ee314b --- /dev/null +++ b/src/renderer/index.ts @@ -0,0 +1,232 @@ +import { createMermaidRenderer, type MermaidRenderer } from 'mermaid-isomorphic'; +import { chromium, type Browser, type Page } from 'playwright'; +import type { RenderOptions, FrameVisibility } from '../types.js'; + +let renderer: MermaidRenderer | null = null; +let screenshotBrowser: Browser | null = null; + +function getRenderer(): MermaidRenderer { + if (!renderer) { + renderer = createMermaidRenderer({ + launchOptions: { + args: ['--no-sandbox', '--disable-setuid-sandbox'], + }, + }); + } + return renderer; +} + +async function getScreenshotBrowser(): Promise { + if (!screenshotBrowser) { + screenshotBrowser = await chromium.launch({ + args: ['--no-sandbox', '--disable-setuid-sandbox'], + }); + } + return screenshotBrowser; +} + +export async function renderDiagram( + code: string, + opts: RenderOptions +): Promise { + const render = getRenderer(); + const results = await render([code], { + screenshot: true, + mermaidConfig: { + theme: opts.theme, + }, + }); + + const result = results[0]; + if (result.status === 'rejected') { + throw new Error(`Mermaid render failed: ${result.reason}`); + } + if (!result.value.screenshot) { + throw new Error('No screenshot produced'); + } + return Buffer.from(result.value.screenshot); +} + +export async function renderFrames( + codes: string[], + opts: RenderOptions +): Promise { + const render = getRenderer(); + const results = await render(codes, { + screenshot: true, + mermaidConfig: { + theme: opts.theme, + }, + }); + + return results.map((result, i) => { + if (result.status === 'rejected') { + throw new Error(`Frame ${i} render failed: ${result.reason}`); + } + if (!result.value.screenshot) { + throw new Error(`Frame ${i}: no screenshot produced`); + } + return Buffer.from(result.value.screenshot); + }); +} + +// --- Stable-layout progressive rendering --- + +interface SvgElementIds { + nodeIds: Map; // nodeName → full SVG element ID + edgeIds: Map; // "source_target" → full SVG element IDs + edgeLabelDataIds: Map; // "source_target" → data-id values +} + +/** + * Extract node and edge IDs from mermaid SVG output. + */ +function extractSvgIds(svg: string): SvgElementIds { + const nodeIds = new Map(); + const edgeIds = new Map(); + const edgeLabelDataIds = new Map(); + + // Node IDs: id="mermaid-0-flowchart-A-0" + const nodeRegex = /id="(mermaid-\d+-flowchart-(\w+)-\d+)"/g; + let match; + while ((match = nodeRegex.exec(svg)) !== null) { + nodeIds.set(match[2], match[1]); + } + + // Edge path IDs: id="mermaid-0-L_A_B_0" + const edgeRegex = /id="(mermaid-\d+-L_(\w+)_(\w+)_\d+)"/g; + while ((match = edgeRegex.exec(svg)) !== null) { + const key = `${match[2]}_${match[3]}`; + const ids = edgeIds.get(key) || []; + ids.push(match[1]); + edgeIds.set(key, ids); + } + + // Edge label data-ids: data-id="L_A_B_0" + const labelRegex = /data-id="(L_(\w+)_(\w+)_\d+)"/g; + while ((match = labelRegex.exec(svg)) !== null) { + const key = `${match[2]}_${match[3]}`; + const ids = edgeLabelDataIds.get(key) || []; + ids.push(match[1]); + edgeLabelDataIds.set(key, ids); + } + + return { nodeIds, edgeIds, edgeLabelDataIds }; +} + +/** + * Build CSS that hides SVG elements not visible in the current frame. + */ +function buildHidingCss( + svgIds: SvgElementIds, + visibleNodes: Set +): string { + const selectors: string[] = []; + + // Hide nodes not yet visible + for (const [nodeName, svgId] of svgIds.nodeIds) { + if (!visibleNodes.has(nodeName)) { + selectors.push(`#${cssEscapeId(svgId)}`); + } + } + + // Hide edges where either endpoint is not visible + for (const [key, ids] of svgIds.edgeIds) { + const [source, target] = key.split('_'); + if (!visibleNodes.has(source) || !visibleNodes.has(target)) { + for (const id of ids) { + selectors.push(`#${cssEscapeId(id)}`); + } + } + } + + // Hide edge labels where either endpoint is not visible + for (const [key, dataIds] of svgIds.edgeLabelDataIds) { + const [source, target] = key.split('_'); + if (!visibleNodes.has(source) || !visibleNodes.has(target)) { + for (const dataId of dataIds) { + selectors.push(`[data-id="${dataId}"]`); + } + } + } + + if (selectors.length === 0) return ''; + return selectors.join(', ') + ' { visibility: hidden !important; }'; +} + +function cssEscapeId(id: string): string { + // CSS.escape equivalent for SVG IDs (alphanumeric + hyphens, safe without escaping) + return id.replace(/([^\w-])/g, '\\$1'); +} + +/** + * Render progressive frames with stable layout. + * 1. Renders the full diagram to SVG (final layout) + * 2. For each frame, injects CSS to hide future elements + * 3. Screenshots each modified SVG via Playwright + */ +export async function renderStableProgressiveFrames( + fullCode: string, + frameVisibility: FrameVisibility[], + opts: RenderOptions +): Promise { + // 1. Render full diagram to get SVG with final layout + const render = getRenderer(); + const results = await render([fullCode], { + screenshot: false, + mermaidConfig: { theme: opts.theme }, + }); + + const result = results[0]; + if (result.status === 'rejected') { + throw new Error(`Mermaid render failed: ${result.reason}`); + } + + const svg = result.value.svg; + const svgWidth = result.value.width; + const svgHeight = result.value.height; + + // 2. Extract element IDs from SVG + const svgIds = extractSvgIds(svg); + + // 3. Prepare a fixed-size SVG (replace width="100%" with explicit dimensions) + const fixedSvg = svg.replace( + /width="100%"/, + `width="${svgWidth}" height="${svgHeight}"` + ); + + // 4. For each frame, inject hiding CSS and screenshot + const browser = await getScreenshotBrowser(); + const page = await browser.newPage(); + await page.setViewportSize({ + width: Math.ceil(svgWidth) + 20, + height: Math.ceil(svgHeight) + 20, + }); + + const pngBuffers: Buffer[] = []; + + for (const frame of frameVisibility) { + const hidingCss = buildHidingCss(svgIds, frame.visibleNodes); + const modifiedSvg = hidingCss + ? fixedSvg.replace('', hidingCss + '') + : fixedSvg; + + const html = `${modifiedSvg}`; + await page.setContent(html, { waitUntil: 'load' }); + + const screenshot = await page.screenshot({ + clip: { + x: 0, + y: 0, + width: Math.ceil(svgWidth), + height: Math.ceil(svgHeight), + }, + type: 'png', + }); + + pngBuffers.push(Buffer.from(screenshot)); + } + + await page.close(); + return pngBuffers; +} diff --git a/src/server/index.ts b/src/server/index.ts new file mode 100644 index 0000000..7e39e04 --- /dev/null +++ b/src/server/index.ts @@ -0,0 +1,210 @@ +import { createServer, IncomingMessage, ServerResponse } from 'http'; +import { readFileSync } from 'fs'; +import { join, extname } from 'path'; +import { fileURLToPath } from 'url'; +import { WebSocketServer } from 'ws'; +import { getAnimator } from '../animators/index.js'; +import { ProgressiveAnimator } from '../animators/progressive.js'; +import { renderFrames, renderStableProgressiveFrames } from '../renderer/index.js'; +import { encodeGif } from '../encoder/gif.js'; +import type { AnimationMode, RenderOptions } from '../types.js'; + +const __dirname = fileURLToPath(new URL('.', import.meta.url)); + +const MIME_TYPES: Record = { + '.html': 'text/html', + '.js': 'text/javascript', + '.css': 'text/css', + '.png': 'image/png', + '.gif': 'image/gif', +}; + +const CORS_HEADERS: Record = { + 'Access-Control-Allow-Origin': '*', + 'Access-Control-Allow-Methods': 'POST, OPTIONS', + 'Access-Control-Allow-Headers': 'Content-Type', +}; + +interface RenderRequest { + code: string; + mode?: AnimationMode; + delay?: number; + theme?: RenderOptions['theme']; +} + +/** + * Shared render function: mermaid code → GIF base64 + * Used by both the WebSocket handler and the HTTP API. + */ +async function renderMermaidToGif( + code: string, + mode: AnimationMode = 'progressive', + delay: number = 500, + theme: RenderOptions['theme'] = 'default', + onStatus?: (message: string) => void +): Promise<{ gif: string; frames: number; width: number; height: number }> { + const renderOpts: RenderOptions = { + width: 800, + theme, + backgroundColor: 'white', + }; + + let pngBuffers: Buffer[]; + + if (mode === 'progressive') { + const animator = new ProgressiveAnimator(); + const progressive = animator.parseStable(code, delay); + onStatus?.(`Rendering ${progressive.frameVisibility.length} frames (stable layout)...`); + pngBuffers = await renderStableProgressiveFrames( + progressive.fullCode, + progressive.frameVisibility, + renderOpts + ); + } else { + const animator = getAnimator(mode); + const result = animator.parse(code, delay); + onStatus?.(`Rendering ${result.frames.length} frames...`); + pngBuffers = await renderFrames( + result.frames.map((f) => f.mermaidCode), + renderOpts + ); + } + + onStatus?.('Encoding GIF...'); + const gif = await encodeGif(pngBuffers, { delay }); + const base64 = Buffer.from(gif).toString('base64'); + + return { + gif: base64, + frames: pngBuffers.length, + width: 800, + height: 600, + }; +} + +/** + * Read the full request body as a string. + */ +function readBody(req: IncomingMessage): Promise { + return new Promise((resolve, reject) => { + const chunks: Buffer[] = []; + req.on('data', (chunk: Buffer) => chunks.push(chunk)); + req.on('end', () => resolve(Buffer.concat(chunks).toString())); + req.on('error', reject); + }); +} + +/** + * Handle POST /api/render — HTTP API for GIF rendering. + */ +async function handleApiRender(req: IncomingMessage, res: ServerResponse): Promise { + // CORS preflight + if (req.method === 'OPTIONS') { + res.writeHead(204, CORS_HEADERS); + res.end(); + return; + } + + if (req.method !== 'POST') { + res.writeHead(405, { ...CORS_HEADERS, 'Content-Type': 'application/json' }); + res.end(JSON.stringify({ error: 'Method not allowed' })); + return; + } + + try { + const body = await readBody(req); + const { code, mode, delay, theme } = JSON.parse(body) as RenderRequest; + + if (!code || typeof code !== 'string') { + res.writeHead(400, { ...CORS_HEADERS, 'Content-Type': 'application/json' }); + res.end(JSON.stringify({ error: 'Missing required field: code' })); + return; + } + + const result = await renderMermaidToGif(code, mode, delay, theme); + + res.writeHead(200, { ...CORS_HEADERS, 'Content-Type': 'application/json' }); + res.end(JSON.stringify(result)); + } catch (err) { + const message = err instanceof Error ? err.message : String(err); + console.error('API render error:', message); + res.writeHead(500, { ...CORS_HEADERS, 'Content-Type': 'application/json' }); + res.end(JSON.stringify({ error: message })); + } +} + +export async function startServer(port: number, initialCode: string): Promise { + const staticDir = join(__dirname, 'static'); + + const server = createServer((req, res) => { + const url = req.url === '/' ? '/index.html' : req.url!; + + // API routes + if (url === '/api/initial-code') { + res.writeHead(200, { 'Content-Type': 'application/json' }); + res.end(JSON.stringify({ code: initialCode })); + return; + } + + if (url === '/api/render') { + handleApiRender(req, res); + return; + } + + // CORS preflight for any /api/* path + if (url.startsWith('/api/') && req.method === 'OPTIONS') { + res.writeHead(204, CORS_HEADERS); + res.end(); + return; + } + + // Static file serving + try { + const filePath = join(staticDir, url); + const content = readFileSync(filePath); + const ext = extname(filePath); + res.writeHead(200, { 'Content-Type': MIME_TYPES[ext] || 'application/octet-stream' }); + res.end(content); + } catch { + res.writeHead(404); + res.end('Not found'); + } + }); + + const wss = new WebSocketServer({ server }); + + wss.on('connection', (ws) => { + console.log('Client connected'); + + ws.on('message', async (data) => { + try { + const msg = JSON.parse(data.toString()); + if (msg.type === 'render') { + const { code, mode = 'progressive', delay = 500, theme = 'default' } = msg; + + ws.send(JSON.stringify({ type: 'status', message: 'Parsing...' })); + + const result = await renderMermaidToGif( + code, + mode as AnimationMode, + delay, + theme as RenderOptions['theme'], + (message) => ws.send(JSON.stringify({ type: 'status', message })) + ); + + ws.send(JSON.stringify({ type: 'gif', data: result.gif })); + } + } catch (err) { + const message = err instanceof Error ? err.message : String(err); + ws.send(JSON.stringify({ type: 'error', message })); + } + }); + }); + + server.listen(port, () => { + console.log(`Preview server running at http://localhost:${port}`); + }); + + // Keep process alive + await new Promise(() => {}); +} diff --git a/src/server/static/editor.js b/src/server/static/editor.js new file mode 100644 index 0000000..82c3009 --- /dev/null +++ b/src/server/static/editor.js @@ -0,0 +1,38 @@ +// Monaco Editor setup +const DEFAULT_CODE = `graph TD + A[Start] --> B[Process] + B --> C{Decision} + C -->|Yes| D[Result] + C -->|No| E[Other]`; + +let editor; + +require.config({ paths: { vs: 'https://cdn.jsdelivr.net/npm/monaco-editor@0.52.2/min/vs' } }); + +require(['vs/editor/editor.main'], function () { + editor = monaco.editor.create(document.getElementById('editor-container'), { + value: DEFAULT_CODE, + language: 'markdown', + theme: 'vs-dark', + minimap: { enabled: false }, + fontSize: 14, + lineNumbers: 'on', + wordWrap: 'on', + automaticLayout: true, + scrollBeyondLastLine: false, + }); + + // Load initial code from server if provided + fetch('/api/initial-code') + .then((r) => r.json()) + .then((data) => { + if (data.code) { + editor.setValue(data.code); + } + }) + .catch(() => {}); +}); + +function getEditorValue() { + return editor ? editor.getValue() : DEFAULT_CODE; +} diff --git a/src/server/static/index.html b/src/server/static/index.html new file mode 100644 index 0000000..df9e2a2 --- /dev/null +++ b/src/server/static/index.html @@ -0,0 +1,70 @@ + + + + + + Mermaid Animator — Preview + + + +
+

Mermaid Animator

+
+ + + + +
+
+
+
+
+
Ready
+
+
+ +

Click "Render GIF" to generate animation

+ Download GIF +
+
+ + + + + + diff --git a/src/server/static/preview.js b/src/server/static/preview.js new file mode 100644 index 0000000..b007a99 --- /dev/null +++ b/src/server/static/preview.js @@ -0,0 +1,53 @@ +// WebSocket preview client +const ws = new WebSocket(`ws://${location.host}`); +const statusEl = document.getElementById('status'); +const renderBtn = document.getElementById('render-btn'); +const previewImg = document.getElementById('preview-img'); +const placeholder = document.getElementById('placeholder'); +const downloadLink = document.getElementById('download-link'); + +ws.onopen = () => { + statusEl.textContent = 'Connected'; +}; + +ws.onclose = () => { + statusEl.textContent = 'Disconnected — refresh to reconnect'; +}; + +ws.onmessage = (event) => { + const msg = JSON.parse(event.data); + + switch (msg.type) { + case 'status': + statusEl.textContent = msg.message; + break; + + case 'gif': + const dataUrl = `data:image/gif;base64,${msg.data}`; + previewImg.src = dataUrl; + previewImg.style.display = 'block'; + placeholder.style.display = 'none'; + downloadLink.href = dataUrl; + downloadLink.style.display = 'inline'; + statusEl.textContent = 'Done'; + renderBtn.disabled = false; + break; + + case 'error': + statusEl.textContent = `Error: ${msg.message}`; + renderBtn.disabled = false; + break; + } +}; + +renderBtn.addEventListener('click', () => { + const code = getEditorValue(); + const mode = document.getElementById('mode').value; + const delay = parseInt(document.getElementById('delay').value, 10); + const theme = document.getElementById('theme').value; + + renderBtn.disabled = true; + statusEl.textContent = 'Sending...'; + + ws.send(JSON.stringify({ type: 'render', code, mode, delay, theme })); +}); diff --git a/src/types.ts b/src/types.ts new file mode 100644 index 0000000..0775e15 --- /dev/null +++ b/src/types.ts @@ -0,0 +1,42 @@ +export interface RenderOptions { + width: number; + height?: number; + theme: 'default' | 'dark' | 'forest' | 'neutral'; + backgroundColor: string; +} + +export interface AnimationFrame { + mermaidCode: string; + delay: number; // ms +} + +export interface AnimationResult { + frames: AnimationFrame[]; +} + +export type AnimationMode = 'progressive' | 'template' | 'sequence'; + +export interface Animator { + parse(input: string, delay: number): AnimationResult; +} + +/** Progressive mode: stable-layout frames with visibility info */ +export interface ProgressiveResult { + fullCode: string; + frameVisibility: FrameVisibility[]; + delay: number; +} + +export interface FrameVisibility { + visibleNodes: Set; +} + +export interface CliOptions { + output: string; + mode: AnimationMode; + delay: number; + width: number; + height?: number; + theme: 'default' | 'dark' | 'forest' | 'neutral'; + backgroundColor: string; +} diff --git a/test/fixtures/sequence.mmd b/test/fixtures/sequence.mmd new file mode 100644 index 0000000..054bd45 --- /dev/null +++ b/test/fixtures/sequence.mmd @@ -0,0 +1,15 @@ +graph TD + A[Start] +--- +graph TD + A[Start] --> B[Process] +--- +graph TD + A[Start] --> B[Process] + B --> C{Decision} +--- +graph TD + A[Start] --> B[Process] + B --> C{Decision} + C -->|Yes| D[Result] + C -->|No| E[Other] diff --git a/test/fixtures/simple.mmd b/test/fixtures/simple.mmd new file mode 100644 index 0000000..0132c54 --- /dev/null +++ b/test/fixtures/simple.mmd @@ -0,0 +1,5 @@ +graph TD + A[Start] --> B[Process] + B --> C{Decision} + C -->|Yes| D[Result] + C -->|No| E[Other] diff --git a/test/fixtures/template.mmd b/test/fixtures/template.mmd new file mode 100644 index 0000000..18d4656 --- /dev/null +++ b/test/fixtures/template.mmd @@ -0,0 +1,4 @@ +graph TD + A[{[0 Start |1 Begin |2 Initialize]}] --> B[{[0 Step 1 |1 Step 2 |2 Step 3]}] + B --> C[{[0 Processing |1 Computing |2 Finishing]}] + C --> D[Done] diff --git a/tsconfig.json b/tsconfig.json new file mode 100644 index 0000000..6206741 --- /dev/null +++ b/tsconfig.json @@ -0,0 +1,17 @@ +{ + "compilerOptions": { + "target": "ES2022", + "module": "NodeNext", + "moduleResolution": "NodeNext", + "outDir": "dist", + "rootDir": "src", + "strict": true, + "esModuleInterop": true, + "skipLibCheck": true, + "forceConsistentCasingInFileNames": true, + "declaration": true, + "sourceMap": true + }, + "include": ["src/**/*"], + "exclude": ["node_modules", "dist"] +}