Diffusion Ant (type-hints-typescript) Code

ant/tests/bench_regex.cjs
899dad6b8a9etype-hints-typescript

bench_regex.cjs
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			const now = () =>
			typeof performance !== 'undefined' && performance && typeof performance.now === 'function'
			? performance.now()
			: Date.now();

			function bench(name, rounds, fn) {
			fn();
			const start = now();
			let result;
			for (let i = 0; i < rounds; i++) result = fn();
			const elapsed = now() - start;
			console.log(
			`${name}: ${elapsed.toFixed(2)}ms total, ${(elapsed / rounds).toFixed(4)}ms/round`
			);
			return result;
			}

			const routeCorpus = new Array(2000)
			.fill(0)
			.map((_, i) => `/api/v1/users/${i}/posts/${i % 17}?limit=50&offset=${i}`)
			.join('\n');

			const unicodeCorpus = new Array(2500)
			.fill('alpha beta gamma delta user_123 route_456 JSON42 token99')
			.join(' ');

			const routeSource =
			'^/api/v(?<version>[0-9]+)/users/(?<user>[0-9]+)/posts/(?<post>[0-9]+)(?:\\?(?<query>.*))?$';

			const routeRe = new RegExp(routeSource, 'gm');
			const tokenRe = /\b[a-z_]+[0-9]*\b/g;
			const splitRe = /[A-Za-z_][A-Za-z0-9_]{0,31}/g;

			console.log('=== Regex Benchmark ===');
			console.log(`route corpus bytes: ${routeCorpus.length}`);
			console.log(`unicode corpus bytes: ${unicodeCorpus.length}`);
			console.log('');

			bench('compile route regexp x5000', 5000, () => new RegExp(routeSource, 'gm'));

			bench('route matches x400', 400, () => {
			routeRe.lastIndex = 0;
			let count = 0;
			while (routeRe.exec(routeCorpus)) count++;
			return count;
			});

			bench('token scan x500', 500, () => {
			tokenRe.lastIndex = 0;
			let count = 0;
			while (tokenRe.exec(unicodeCorpus)) count++;
			return count;
			});

			bench('identifier split x500', 500, () => {
			splitRe.lastIndex = 0;
			let count = 0;
			while (splitRe.exec(unicodeCorpus)) count++;
			return count;
			});

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