Re-escape Unicode characters in CSS

escape-unicode

#!/usr/bin/env node

/**
 * escape-unicode.js - A script to escape Unicode characters in CSS content properties
 *
 * This script finds actual Unicode characters in CSS content properties and
 * converts them back to escape sequences. It's designed to be run after the
 * PostCSS/LightningCSS build process.
 *
 * Usage: node escape-unicode.js <css-file>
 */

const fs = require('fs');
const contentRegex = /content\s*:\s*(['"])(.*?)\1/g;

/**
 * Escape Unicode characters in a string
 * @param {string} str - The string to process
 * @returns {string} - The processed string with Unicode characters escaped
 */
function escapeUnicode(str) {
	return str.replace(
		/[\u0080-\uD7FF\uE000-\uFFFF]|[\uD800-\uDBFF][\uDC00-\uDFFF]/g,
		(char) => {
			const codePoint = char.codePointAt(0).toString(16);
			return (
				'\\' +
				(codePoint.length <= 4 ? codePoint.padStart(4, '0') : codePoint)
			);
		}
	);
}

/**
 * Process a CSS file to escape Unicode characters in content properties
 *
 * @param {string} filePath - Path to the CSS file
 */
function escapeUnicodeInFile(filePath) {
	console.log(`Processing file: ${filePath}`);

	let css;
	try {
		css = fs.readFileSync(filePath, 'utf8');
	} catch (error) {
		console.error(`Error reading file: ${error.message}`);
		process.exit(1);
	}

	let changesCount = 0;
	const fixed = css.replace(contentRegex, (match, quote, content) => {
		const escaped = escapeUnicode(content);
		if (escaped !== content) {
			changesCount++;
		}
		return `content: ${quote}${escaped}${quote}`;
	});

	if (changesCount > 0) {
		try {
			fs.writeFileSync(filePath, fixed, 'utf8');
			console.log(
				`Escaped ${changesCount} Unicode content properties in ${filePath}`
			);
		} catch (error) {
			console.error(`Error writing file: ${error.message}`);
			process.exit(1);
		}
	} else {
		console.log('No changes needed.');
	}
}

const args = process.argv.slice(2);
if (args.length === 0) {
	console.error('Please provide a CSS file path.');
	process.exit(1);
}

args.forEach(escapeUnicodeInFile);