Jeffrey Smith
81c28a50bf
All checks were successful
Co-authored-by: Jeffrey Smith <jasafpro@gmail.com> Co-committed-by: Jeffrey Smith <jasafpro@gmail.com>
641 lines
26 KiB
JavaScript
641 lines
26 KiB
JavaScript
// ==========================================
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// Mermaid Diagram Renderer — Browser Extension
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// ==========================================
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// Renders ```mermaid code blocks as interactive SVG diagrams.
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// Features: viewBox-based zoom/pan, fullscreen expand,
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// SVG/PNG export, source copy.
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// Loads mermaid.js dynamically on first use.
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//
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// Registers with sw.renderers via the sw:ready event.
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// ==========================================
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(function () {
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'use strict';
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let _mermaidReady = false;
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let _mermaidLoading = null;
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function _isDark() {
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return document.documentElement.dataset.theme === 'dark' ||
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document.documentElement.classList.contains('dark');
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}
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function _escapeHtml(str) {
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const div = document.createElement('div');
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div.textContent = str;
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return div.innerHTML;
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}
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// ── ViewBox Zoom/Pan State ──────────────
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function _getState(id) {
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const vp = document.querySelector(`[data-viewport="${id}"]`);
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if (!vp) return null;
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if (!vp._mmdState) {
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vp._mmdState = {
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natX: 0, natY: 0, natW: 0, natH: 0,
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vbX: 0, vbY: 0, vbW: 0, vbH: 0,
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dragging: false, startX: 0, startY: 0,
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startVbX: 0, startVbY: 0,
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ready: false,
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};
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}
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return vp._mmdState;
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}
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function _initState(id) {
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const state = _getState(id);
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if (!state) return;
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const svg = document.querySelector(`[data-diagram="${id}"] svg`);
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if (!svg) return;
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const vb = svg.getAttribute('viewBox');
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if (!vb) {
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const bbox = svg.getBBox();
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state.natX = bbox.x; state.natY = bbox.y;
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state.natW = bbox.width; state.natH = bbox.height;
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} else {
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const parts = vb.trim().split(/[\s,]+/).map(Number);
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state.natX = parts[0] || 0; state.natY = parts[1] || 0;
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state.natW = parts[2] || 0; state.natH = parts[3] || 0;
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}
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state.vbX = state.natX; state.vbY = state.natY;
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state.vbW = state.natW; state.vbH = state.natH;
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state.ready = true;
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_applyViewBox(id);
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}
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function _applyViewBox(id) {
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const state = _getState(id);
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if (!state || !state.ready) return;
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const svg = document.querySelector(`[data-diagram="${id}"] svg`);
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if (!svg) return;
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svg.setAttribute('viewBox', `${state.vbX} ${state.vbY} ${state.vbW} ${state.vbH}`);
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const zoomPct = Math.round((state.natW / state.vbW) * 100);
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const label = document.querySelector(`[data-zoom-label="${id}"]`);
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if (label) label.textContent = zoomPct + '%';
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}
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function _zoom(id, factor) {
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const state = _getState(id);
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if (!state || !state.ready) return;
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const scale = 1 / (1 + factor);
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const newW = state.vbW * scale;
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const newH = state.vbH * scale;
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if (newW < state.natW / 20 || newW > state.natW * 2) return;
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const cx = state.vbX + state.vbW / 2;
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const cy = state.vbY + state.vbH / 2;
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state.vbW = newW; state.vbH = newH;
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state.vbX = cx - newW / 2; state.vbY = cy - newH / 2;
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_applyViewBox(id);
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}
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function _zoomAt(id, factor, clientX, clientY) {
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const state = _getState(id);
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if (!state || !state.ready) return;
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const svg = document.querySelector(`[data-diagram="${id}"] svg`);
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if (!svg) return;
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const svgRect = svg.getBoundingClientRect();
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if (svgRect.width === 0 || svgRect.height === 0) return;
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const fx = (clientX - svgRect.left) / svgRect.width;
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const fy = (clientY - svgRect.top) / svgRect.height;
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const pointX = state.vbX + fx * state.vbW;
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const pointY = state.vbY + fy * state.vbH;
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const scale = 1 / (1 + factor);
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const newW = state.vbW * scale;
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const newH = state.vbH * scale;
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if (newW < state.natW / 20 || newW > state.natW * 2) return;
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state.vbW = newW; state.vbH = newH;
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state.vbX = pointX - fx * newW; state.vbY = pointY - fy * newH;
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_applyViewBox(id);
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}
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function _zoomReset(id) {
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const state = _getState(id);
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if (!state || !state.ready) return;
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state.vbX = state.natX; state.vbY = state.natY;
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state.vbW = state.natW; state.vbH = state.natH;
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_applyViewBox(id);
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}
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function _zoomFit(id) {
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const state = _getState(id);
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if (!state || !state.ready) return;
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const vp = document.querySelector(`[data-viewport="${id}"]`);
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if (!vp) return;
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const vpRect = vp.getBoundingClientRect();
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if (vpRect.width === 0 || vpRect.height === 0) return;
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const vpAspect = vpRect.width / vpRect.height;
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const natAspect = state.natW / state.natH;
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if (vpAspect > natAspect) {
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const newW = state.natH * vpAspect;
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state.vbX = state.natX - (newW - state.natW) / 2;
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state.vbY = state.natY;
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state.vbW = newW; state.vbH = state.natH;
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} else {
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const newH = state.natW / vpAspect;
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state.vbX = state.natX;
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state.vbY = state.natY - (newH - state.natH) / 2;
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state.vbW = state.natW; state.vbH = newH;
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}
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_applyViewBox(id);
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}
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// ── Fullscreen ──────────────────────────
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function _toggleFullscreen(id) {
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const block = document.querySelector(`[data-mermaid-id="${id}"]`);
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if (!block) return;
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const isFS = block.classList.toggle('mermaid-fullscreen');
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if (isFS) {
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document.body.style.overflow = 'hidden';
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const closeBtn = document.createElement('button');
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closeBtn.className = 'mmd-fullscreen-close';
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closeBtn.innerHTML = '\u2715';
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closeBtn.title = 'Close fullscreen';
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closeBtn.addEventListener('click', () => _toggleFullscreen(id));
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block.appendChild(closeBtn);
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block._mmdEscHandler = (e) => { if (e.key === 'Escape') _toggleFullscreen(id); };
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document.addEventListener('keydown', block._mmdEscHandler);
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requestAnimationFrame(() => _zoomFit(id));
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} else {
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document.body.style.overflow = '';
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const closeBtn = block.querySelector('.mmd-fullscreen-close');
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if (closeBtn) closeBtn.remove();
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if (block._mmdEscHandler) {
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document.removeEventListener('keydown', block._mmdEscHandler);
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delete block._mmdEscHandler;
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}
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}
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}
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// ── Toolbar Wiring ──────────────────────
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function _wireToolbar(container) {
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if (container._mmdWired) return;
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container._mmdWired = true;
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container.addEventListener('click', (e) => {
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const btn = e.target.closest('[data-action]');
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if (!btn) return;
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const action = btn.dataset.action;
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const id = btn.dataset.target;
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if (!id) return;
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switch (action) {
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case 'zoom-in': _zoom(id, 0.25); break;
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case 'zoom-out': _zoom(id, -0.2); break;
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case 'zoom-reset': _zoomReset(id); break;
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case 'zoom-fit': _zoomFit(id); break;
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case 'expand': _toggleFullscreen(id); break;
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case 'export-svg': _exportSVG(id); break;
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case 'export-png': _exportPNG(id); break;
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case 'copy-src': _copySource(id); break;
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}
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});
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// Wire each viewport for mouse/touch interaction
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container.querySelectorAll('.mermaid-viewport').forEach(vp => {
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if (vp._mmdWired) return;
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vp._mmdWired = true;
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const id = vp.dataset.viewport;
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vp.addEventListener('wheel', (e) => {
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e.preventDefault();
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const delta = e.deltaY > 0 ? -0.1 : 0.1;
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_zoomAt(id, delta, e.clientX, e.clientY);
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}, { passive: false });
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vp.addEventListener('mousedown', (e) => {
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if (e.button !== 0) return;
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const state = _getState(id);
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if (!state || !state.ready) return;
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state.dragging = true;
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state.startX = e.clientX; state.startY = e.clientY;
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state.startVbX = state.vbX; state.startVbY = state.vbY;
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vp.classList.add('mmd-grabbing');
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e.preventDefault();
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});
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vp.addEventListener('mousemove', (e) => {
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const state = _getState(id);
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if (!state?.dragging) return;
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const svg = document.querySelector(`[data-diagram="${id}"] svg`);
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if (!svg) return;
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const svgRect = svg.getBoundingClientRect();
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if (svgRect.width === 0) return;
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const pxToVb = state.vbW / svgRect.width;
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state.vbX = state.startVbX - (e.clientX - state.startX) * pxToVb;
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state.vbY = state.startVbY - (e.clientY - state.startY) * pxToVb;
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_applyViewBox(id);
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});
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const endDrag = () => {
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const state = _getState(id);
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if (!state) return;
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state.dragging = false;
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vp.classList.remove('mmd-grabbing');
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};
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vp.addEventListener('mouseup', endDrag);
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vp.addEventListener('mouseleave', endDrag);
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let lastTouchDist = 0;
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vp.addEventListener('touchstart', (e) => {
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const state = _getState(id);
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if (!state || !state.ready) return;
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if (e.touches.length === 1) {
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state.dragging = true;
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state.startX = e.touches[0].clientX;
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state.startY = e.touches[0].clientY;
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state.startVbX = state.vbX;
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state.startVbY = state.vbY;
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} else if (e.touches.length === 2) {
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lastTouchDist = Math.hypot(
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e.touches[0].clientX - e.touches[1].clientX,
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e.touches[0].clientY - e.touches[1].clientY
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);
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}
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}, { passive: true });
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vp.addEventListener('touchmove', (e) => {
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const state = _getState(id);
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if (!state || !state.ready) return;
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if (e.touches.length === 1 && state.dragging) {
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const svg = document.querySelector(`[data-diagram="${id}"] svg`);
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if (!svg) return;
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const svgRect = svg.getBoundingClientRect();
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if (svgRect.width === 0) return;
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const pxToVb = state.vbW / svgRect.width;
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state.vbX = state.startVbX - (e.touches[0].clientX - state.startX) * pxToVb;
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state.vbY = state.startVbY - (e.touches[0].clientY - state.startY) * pxToVb;
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_applyViewBox(id);
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e.preventDefault();
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} else if (e.touches.length === 2) {
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const dist = Math.hypot(
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e.touches[0].clientX - e.touches[1].clientX,
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e.touches[0].clientY - e.touches[1].clientY
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);
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const center = {
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x: (e.touches[0].clientX + e.touches[1].clientX) / 2,
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y: (e.touches[0].clientY + e.touches[1].clientY) / 2,
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};
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if (lastTouchDist > 0) {
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const factor = (dist - lastTouchDist) / lastTouchDist;
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_zoomAt(id, factor, center.x, center.y);
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}
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lastTouchDist = dist;
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e.preventDefault();
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}
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}, { passive: false });
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vp.addEventListener('touchend', () => {
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const state = _getState(id);
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if (state) state.dragging = false;
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lastTouchDist = 0;
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}, { passive: true });
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});
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}
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// ── Export ───────────────────────────────
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function _exportSVG(id) {
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const diagram = document.querySelector(`[data-diagram="${id}"]`);
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const svg = diagram?.querySelector('svg');
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if (!svg) return;
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const state = _getState(id);
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const clone = svg.cloneNode(true);
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clone.setAttribute('xmlns', 'http://www.w3.org/2000/svg');
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if (state?.ready) {
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clone.setAttribute('viewBox', `${state.natX} ${state.natY} ${state.natW} ${state.natH}`);
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}
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const blob = new Blob([clone.outerHTML], { type: 'image/svg+xml' });
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_download(blob, `diagram-${id}.svg`);
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}
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function _exportPNG(id) {
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const diagram = document.querySelector(`[data-diagram="${id}"]`);
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const svg = diagram?.querySelector('svg');
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if (!svg) return;
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const state = _getState(id);
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const clone = svg.cloneNode(true);
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clone.setAttribute('xmlns', 'http://www.w3.org/2000/svg');
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if (state?.ready) {
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clone.setAttribute('viewBox', `${state.natX} ${state.natY} ${state.natW} ${state.natH}`);
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clone.setAttribute('width', state.natW);
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clone.setAttribute('height', state.natH);
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}
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const svgData = new XMLSerializer().serializeToString(clone);
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const svgBlob = new Blob([svgData], { type: 'image/svg+xml;charset=utf-8' });
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const url = URL.createObjectURL(svgBlob);
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const img = new Image();
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img.onload = () => {
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const scale = 2;
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const canvas = document.createElement('canvas');
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canvas.width = img.naturalWidth * scale;
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canvas.height = img.naturalHeight * scale;
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const ctx = canvas.getContext('2d');
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ctx.scale(scale, scale);
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ctx.drawImage(img, 0, 0);
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URL.revokeObjectURL(url);
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canvas.toBlob((blob) => {
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if (blob) _download(blob, `diagram-${id}.png`);
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}, 'image/png');
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};
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img.onerror = () => {
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URL.revokeObjectURL(url);
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console.error('[Mermaid] PNG export failed');
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};
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img.src = url;
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}
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function _download(blob, filename) {
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const a = document.createElement('a');
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a.href = URL.createObjectURL(blob);
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a.download = filename;
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document.body.appendChild(a);
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a.click();
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document.body.removeChild(a);
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setTimeout(() => URL.revokeObjectURL(a.href), 1000);
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}
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function _copySource(id) {
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const code = document.querySelector(`[data-source="${id}"]`);
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if (!code) return;
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navigator.clipboard.writeText(code.textContent).then(() => {
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if (window.sw?.toast) sw.toast('Source copied', 'success');
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});
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}
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// ── Diagram Rendering ───────────────────
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async function _renderDiagram(el) {
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const code = decodeURIComponent(el.dataset.mermaidSrc);
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const id = el.dataset.diagram;
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try {
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await _loadMermaid();
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const svgId = 'mmd-svg-' + Math.random().toString(36).slice(2, 9);
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const { svg } = await mermaid.render(svgId, code);
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el.innerHTML = svg;
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el.dataset.rendered = 'true';
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const svgEl = el.querySelector('svg');
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if (svgEl) {
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svgEl.removeAttribute('height');
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svgEl.setAttribute('width', '100%');
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svgEl.style.maxWidth = 'none';
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svgEl.setAttribute('preserveAspectRatio', 'xMidYMid meet');
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}
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_initState(id);
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} catch (e) {
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el.innerHTML = `
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<div class="mermaid-error">
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<strong>Diagram error:</strong> ${_escapeHtml(e.message || String(e))}
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</div>
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`;
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el.dataset.rendered = 'error';
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}
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}
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// ── Mermaid Library Loading ──────────────
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function _loadMermaid() {
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if (_mermaidReady) return Promise.resolve();
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if (_mermaidLoading) return _mermaidLoading;
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_mermaidLoading = new Promise((resolve, reject) => {
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if (typeof mermaid !== 'undefined') {
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_initMermaid();
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_mermaidReady = true;
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resolve();
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return;
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}
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const base = (window.__BASE__ || '');
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const localSrc = `${base}/vendor/mermaid/mermaid.min.js`;
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const cdnSrc = 'https://cdn.jsdelivr.net/npm/mermaid@11/dist/mermaid.min.js';
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const script = document.createElement('script');
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script.src = localSrc;
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script.onload = () => {
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_initMermaid();
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_mermaidReady = true;
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resolve();
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};
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script.onerror = () => {
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console.warn('[Mermaid] Local vendor not found, trying CDN');
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const cdn = document.createElement('script');
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cdn.src = cdnSrc;
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cdn.onload = () => {
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_initMermaid();
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_mermaidReady = true;
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resolve();
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};
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cdn.onerror = () => {
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console.error('[Mermaid] Failed to load from both local and CDN');
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reject(new Error('Failed to load mermaid.js'));
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};
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document.head.appendChild(cdn);
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};
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document.head.appendChild(script);
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});
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return _mermaidLoading;
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}
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function _initMermaid() {
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if (typeof mermaid === 'undefined') return;
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mermaid.initialize({
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startOnLoad: false,
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theme: _isDark() ? 'dark' : 'default',
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securityLevel: 'strict',
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fontFamily: 'inherit',
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logLevel: 'error',
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});
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}
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// ── Styles ──────────────────────────────
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function _injectStyles() {
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if (document.getElementById('ext-style-mermaid-renderer')) return;
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const style = document.createElement('style');
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style.id = 'ext-style-mermaid-renderer';
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style.textContent = `
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.mermaid-block {
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background: var(--bg-2); border: 1px solid var(--border);
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border-radius: 8px; overflow: hidden; margin: 12px 0;
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}
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.mermaid-block.mermaid-fullscreen {
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position: fixed; top: 0; left: 0; right: 0; bottom: 0;
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z-index: 10000; border-radius: 0; margin: 0;
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display: flex; flex-direction: column;
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background: var(--bg-1, var(--bg-2, #1a1a2e));
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}
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.mermaid-block.mermaid-fullscreen .mermaid-viewport {
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background: var(--bg-2, #1a1a2e); flex: 1; max-height: none;
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}
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.mermaid-block.mermaid-fullscreen .mermaid-toolbar {
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border-bottom: 1px solid var(--border); padding: 6px 14px;
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}
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.mmd-fullscreen-close {
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position: absolute; top: 12px; right: 12px; z-index: 10001;
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width: 40px; height: 40px; border-radius: 50%;
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background: var(--bg-raised, rgba(0,0,0,0.6));
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border: 1px solid var(--border, rgba(255,255,255,0.2));
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color: var(--text, #fff); font-size: 20px; line-height: 1;
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cursor: pointer; display: flex; align-items: center; justify-content: center;
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transition: background 0.15s, transform 0.15s;
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box-shadow: 0 2px 8px rgba(0,0,0,0.3);
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}
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.mmd-fullscreen-close:hover {
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background: var(--bg-hover, rgba(255,255,255,0.15)); transform: scale(1.1);
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}
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.mermaid-toolbar {
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display: flex; align-items: center; gap: 6px;
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padding: 4px 10px; border-bottom: 1px solid var(--border);
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font-size: 12px; color: var(--text-3); flex-wrap: wrap;
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}
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.mermaid-title { font-weight: 600; color: var(--text-2); margin-right: auto; }
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.mermaid-zoom-label {
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font-family: var(--mono); font-size: 11px; min-width: 36px;
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text-align: center; color: var(--text-3);
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}
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.mermaid-toolbar-btns { display: flex; gap: 2px; align-items: center; }
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.mmd-btn {
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background: none; border: 1px solid var(--border); border-radius: 4px;
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padding: 1px 7px; font-size: 11px; cursor: pointer;
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color: var(--text-3); font-family: var(--mono); line-height: 1.6;
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}
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.mmd-btn:hover { color: var(--text-1); border-color: var(--text-3); background: var(--bg-3); }
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.mmd-sep { width: 1px; height: 16px; background: var(--border); margin: 0 4px; }
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.mermaid-viewport {
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overflow: hidden; position: relative;
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min-height: 80px; max-height: 600px;
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cursor: grab; user-select: none;
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}
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.mermaid-viewport.mmd-grabbing { cursor: grabbing; }
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.mermaid-diagram { width: 100%; height: 100%; min-height: 60px; }
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.mermaid-diagram svg { display: block; width: 100%; height: 100%; }
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.mermaid-loading {
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color: var(--text-3); font-size: 13px; padding: 20px;
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display: flex; align-items: center; justify-content: center; gap: 8px;
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}
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.mermaid-spinner {
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display: inline-block; width: 14px; height: 14px;
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border: 2px solid var(--border); border-top-color: var(--accent);
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border-radius: 50%; animation: mmd-spin 0.8s linear infinite;
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}
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@keyframes mmd-spin { to { transform: rotate(360deg); } }
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.mermaid-error {
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color: var(--error, #e74c3c); background: var(--bg-3, rgba(231,76,60,0.1));
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padding: 12px 16px; border-radius: 4px; font-size: 13px;
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font-family: var(--mono); white-space: pre-wrap;
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}
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.mermaid-source { border-top: 1px solid var(--border); font-size: 12px; }
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.mermaid-source summary {
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padding: 6px 12px; cursor: pointer; color: var(--text-3);
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user-select: none; display: flex; align-items: center; gap: 8px;
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}
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.mermaid-source summary:hover { color: var(--text-2); }
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.mermaid-source summary span { flex: 1; }
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.mmd-copy-src { font-size: 11px; }
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.mermaid-source pre {
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margin: 0; border-radius: 0; border: none;
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max-height: 200px; overflow: auto;
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}
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.mermaid-block.mermaid-fullscreen .mermaid-source { display: none; }
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@media (max-width: 768px) {
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.mermaid-toolbar { padding: 6px 10px; gap: 4px; }
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.mmd-btn { padding: 4px 10px; font-size: 12px; }
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.mmd-sep { margin: 0 2px; }
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.mmd-fullscreen-close { width: 48px; height: 48px; font-size: 24px; top: 16px; right: 16px; }
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}`;
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document.head.appendChild(style);
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}
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// ── Registration ────────────────────────
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function register() {
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if (!window.sw?.renderers) return;
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_injectStyles();
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// Block renderer: match ```mermaid
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sw.renderers.register('mermaid', {
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type: 'block',
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pattern: 'mermaid',
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priority: 10,
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render(lang, code, container) {
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const id = 'mmd-' + Math.random().toString(36).slice(2, 9);
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container.innerHTML = `
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<div class="mermaid-block" data-mermaid-id="${id}">
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<div class="mermaid-toolbar">
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<span class="mermaid-title">\u{1f4ca} Diagram</span>
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<span class="mermaid-zoom-label" data-zoom-label="${id}">100%</span>
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<div class="mermaid-toolbar-btns">
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<button class="mmd-btn" data-action="zoom-in" data-target="${id}" title="Zoom in">+</button>
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<button class="mmd-btn" data-action="zoom-out" data-target="${id}" title="Zoom out">\u2212</button>
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<button class="mmd-btn" data-action="zoom-fit" data-target="${id}" title="Fit to view">\u22a1</button>
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<button class="mmd-btn" data-action="zoom-reset" data-target="${id}" title="Reset zoom">1:1</button>
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<span class="mmd-sep"></span>
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<button class="mmd-btn" data-action="expand" data-target="${id}" title="Fullscreen">\u26f6</button>
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<span class="mmd-sep"></span>
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<button class="mmd-btn" data-action="export-svg" data-target="${id}" title="Download SVG">SVG</button>
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<button class="mmd-btn" data-action="export-png" data-target="${id}" title="Download PNG">PNG</button>
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</div>
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</div>
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<div class="mermaid-viewport" data-viewport="${id}">
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<div class="mermaid-diagram" data-mermaid-src="${encodeURIComponent(code.trim())}" data-diagram="${id}">
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<div class="mermaid-loading">
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<span class="mermaid-spinner"></span> Rendering diagram\u2026
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</div>
|
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</div>
|
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</div>
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<details class="mermaid-source">
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<summary>
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<span>\u{1f4cb} View source</span>
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<button class="mmd-btn mmd-copy-src" data-action="copy-src" data-target="${id}" title="Copy source" onclick="event.stopPropagation()">Copy</button>
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</summary>
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<pre><code class="language-mermaid" data-source="${id}">${_escapeHtml(code.trim())}</code></pre>
|
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</details>
|
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</div>
|
|
`;
|
|
}
|
|
});
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|
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// Post renderer: render diagrams + wire interactivity
|
|
sw.renderers.register('mermaid-post', {
|
|
type: 'post',
|
|
priority: 10,
|
|
render(container) {
|
|
const diagrams = container.querySelectorAll('.mermaid-diagram[data-mermaid-src]');
|
|
if (diagrams.length === 0) return;
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|
|
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diagrams.forEach(el => {
|
|
if (el.dataset.rendered) return;
|
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el.dataset.rendered = 'pending';
|
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_renderDiagram(el);
|
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});
|
|
|
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_wireToolbar(container);
|
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}
|
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});
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|
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_loadMermaid();
|
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}
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|
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// Boot: register immediately if SDK ready, otherwise listen
|
|
if (window.sw?._sdk) {
|
|
register();
|
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} else {
|
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document.addEventListener('sw:ready', register, { once: true });
|
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}
|
|
})();
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