88 lines
4.6 KiB
JavaScript
88 lines
4.6 KiB
JavaScript
#!/usr/bin/env node
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// Documentation-only tool. Install pinned packages in a separate temporary directory;
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// UML_RENDER_TOOLS points there. No app dependencies or remote rendering service.
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import { createRequire } from 'node:module';
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import { readFile, readdir, mkdir, writeFile } from 'node:fs/promises';
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import path from 'node:path';
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import { fileURLToPath, pathToFileURL } from 'node:url';
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const tools = process.env.UML_RENDER_TOOLS;
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if (!tools) throw new Error('Set UML_RENDER_TOOLS to the documentation tool directory; see docs/architecture/uml/README.md');
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const require = createRequire(path.join(path.resolve(tools), 'package.json'));
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const { createCanvas } = require('@napi-rs/canvas');
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const { DOMImplementation, XMLSerializer, DOMParser } = require('@xmldom/xmldom');
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const sharp = require('sharp');
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// PlantUML's official JS engine uses DOM construction and Canvas text metrics.
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// Supply a real XML DOM and native Canvas metrics, not approximate text widths.
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globalThis.PLANTUML_VIZ = require('@viz-js/viz');
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globalThis.window = globalThis;
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globalThis.XMLSerializer = XMLSerializer;
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globalThis.DOMParser = DOMParser;
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const document = new DOMImplementation().createDocument(null, 'root', null);
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const element = document.createElement.bind(document);
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const elementNS = document.createElementNS.bind(document);
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function measurementCanvas() {
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const canvas = createCanvas(1, 1);
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const context = canvas.getContext('2d');
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const measure = context.measureText.bind(context);
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context.measureText = text => {
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const metrics = measure(text);
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// PlantUML uses this height for line spacing. Font-wide ascent/descent
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// keeps adjacent class fields from colliding when glyphs lack descenders.
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return {
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...metrics,
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width: metrics.width,
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actualBoundingBoxAscent: metrics.fontBoundingBoxAscent || metrics.actualBoundingBoxAscent,
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actualBoundingBoxDescent: metrics.fontBoundingBoxDescent || metrics.actualBoundingBoxDescent,
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};
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};
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return canvas;
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}
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document.createElement = tag => tag === 'canvas' ? measurementCanvas() : element(tag);
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document.createElementNS = (namespace, tag) => {
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const node = elementNS(namespace, tag);
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node.style = {};
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node.getBBox = () => {
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const context = measurementCanvas().getContext('2d');
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context.font = `${node.getAttribute('font-size') || 14}px ${node.getAttribute('font-family') || 'Arial'}`;
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const metrics = context.measureText(node.textContent || '');
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return {
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width: metrics.width,
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height: metrics.actualBoundingBoxAscent + metrics.actualBoundingBoxDescent,
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x: 0,
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y: -metrics.actualBoundingBoxAscent,
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};
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};
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return node;
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};
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document.body = element('body');
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document.documentElement.appendChild(document.body);
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globalThis.document = document;
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const { renderToString } = await import(pathToFileURL(require.resolve('@plantuml/core')));
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const root = path.resolve(path.dirname(fileURLToPath(import.meta.url)), '..');
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const source = path.join(root, 'docs/architecture/uml');
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const output = path.join(source, 'rendered');
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await mkdir(output, { recursive: true });
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for (const filename of (await readdir(source)).filter(name => name.endsWith('.puml')).sort()) {
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const text = await readFile(path.join(source, filename), 'utf8');
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const rendered = await new Promise((resolve, reject) => renderToString(text.split('\n'), resolve, reject));
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const xml = new DOMParser().parseFromString(rendered, 'image/svg+xml');
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const labels = Array.from(xml.getElementsByTagName('text'), node => node.textContent).join('\n');
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if (xml.documentElement.tagName !== 'svg' || /syntax error|error line|assumed diagram type|an error has occurr/i.test(labels)) {
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throw new Error(`${filename}: renderer returned an error diagram\n${labels}`);
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}
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// Explicit opaque paper keeps arrows/labels legible in dark Markdown viewers.
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const paper = xml.createElementNS('http://www.w3.org/2000/svg', 'rect');
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for (const [key, value] of Object.entries({ x: '0', y: '0', width: '100%', height: '100%', fill: '#FFFFFF' })) paper.setAttribute(key, value);
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xml.documentElement.insertBefore(paper, xml.documentElement.firstChild);
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const svg = new XMLSerializer().serializeToString(xml);
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const stem = filename.slice(0, -5);
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await writeFile(path.join(output, `${stem}.svg`), svg);
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// High-resolution PNG is the universally visible Markdown preview; SVG keeps zoomable text.
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const png = sharp(Buffer.from(svg), { density: 192 });
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await png.png().toFile(path.join(output, `${stem}.png`));
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const metadata = await sharp(path.join(output, `${stem}.png`)).metadata();
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console.log(`${filename} -> SVG + PNG (${metadata.width}×${metadata.height})`);
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}
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