| #!/usr/bin/env node |
| |
| |
| |
| |
| |
| |
| |
| const fs = require('fs'); |
| const path = require('path'); |
| const { PDFDocument, rgb, StandardFonts } = require('pdf-lib'); |
| const { scenarios, toLatin1, fromLatin1 } = require('./generate'); |
|
|
| const IMG = 'iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAYAAABytg0kAAAAFElEQVQIW2NkwAJGDjACU2M4wAgAJu4BCHgB5hQAAAAASUVORK5CYII='; |
|
|
| |
| function rng(seed) { |
| let s = seed >>> 0; |
| return () => { |
| s = (s + 0x6d2b79f5) >>> 0; |
| let t = s; |
| t = Math.imul(t ^ (t >>> 15), t | 1); |
| t ^= t + Math.imul(t ^ (t >>> 7), t | 61); |
| return ((t ^ (t >>> 14)) >>> 0) / 4294967296; |
| }; |
| } |
|
|
| const WORDS = 'alpha beta gamma delta report invoice summary table chart data page section total value note draft final review'.split(' '); |
|
|
| async function randomPdf(r) { |
| const doc = await PDFDocument.create(); |
| const font = await doc.embedFont(r() < 0.5 ? StandardFonts.Helvetica : StandardFonts.TimesRoman); |
| const pages = 1 + Math.floor(r() * 8); |
| const png = r() < 0.6 ? await doc.embedPng(Buffer.from(IMG, 'base64')) : null; |
| for (let p = 0; p < pages; p++) { |
| const page = doc.addPage([r() < 0.8 ? 595 : 612, r() < 0.8 ? 842 : 792]); |
| const lines = 1 + Math.floor(r() * 40); |
| for (let i = 0; i < lines; i++) { |
| const n = 3 + Math.floor(r() * 12); |
| const text = Array.from({ length: n }, () => WORDS[Math.floor(r() * WORDS.length)]).join(' '); |
| page.drawText(text, { x: 40, y: 800 - i * 14, size: 8 + Math.floor(r() * 5), font, color: rgb(r(), r(), r()) }); |
| } |
| if (png && r() < 0.5) page.drawImage(png, { x: 60, y: 100, width: 40 + r() * 100, height: 40 + r() * 100 }); |
| } |
| return doc.save({ useObjectStreams: false }); |
| } |
|
|
| async function main() { |
| const outDir = path.resolve(process.argv[2] || path.join(__dirname, 'training')); |
| const perClass = parseInt(process.argv[3] || '200', 10); |
| fs.mkdirSync(outDir, { recursive: true }); |
| const r = rng(42); |
| const rows = ['file,label']; |
| const classes = ['valid', ...scenarios.filter((s) => !s.id.startsWith('truncated')).map((s) => s.id), 'truncated']; |
|
|
| for (const label of classes) { |
| for (let i = 0; i < perClass; i++) { |
| const base = await randomPdf(r); |
| const text = toLatin1(base); |
| let out; |
| if (label === 'valid') out = base; |
| else if (label === 'truncated') out = base.slice(0, Math.floor(base.length * (0.3 + r() * 0.6))); |
| else out = scenarios.find((s) => s.id === label).apply(base, text); |
| const name = `${label}_${String(i).padStart(4, '0')}.pdf`; |
| fs.writeFileSync(path.join(outDir, name), out); |
| rows.push(`${name},${label}`); |
| } |
| console.log(`${label}: ${perClass}`); |
| } |
| fs.writeFileSync(path.join(outDir, 'labels.csv'), rows.join('\n') + '\n'); |
| console.log(`labels.csv written to ${outDir}`); |
| } |
|
|
| main().catch((e) => { |
| console.error(e); |
| process.exit(1); |
| }); |
|
|
