astro/dist/core/routing/parts.js

Astro is a modern site builder with web best practices, performance, and DX front-of-mind.

// Disable eslint as we're not sure how to improve this regex yet
// eslint-disable-next-line regexp/no-super-linear-backtracking
const ROUTE_DYNAMIC_SPLIT = /\[(.+?\(.+?\)|.+?)\]/;
const ROUTE_SPREAD = /^\.{3}.+$/;
export function getParts(part, file) {
	const result = [];
	part.split(ROUTE_DYNAMIC_SPLIT).map((str, i) => {
		if (!str) return;
		const dynamic = i % 2 === 1;
		const [, content] = dynamic ? /([^(]+)$/.exec(str) || [null, null] : [null, str];
		if (!content || dynamic && !/^(?:\.\.\.)?[\w$]+$/.test(content)) {
			throw new Error(`Invalid route ${file} — parameter name must match /^[a-zA-Z0-9_$]+$/`);
		}
		result.push({
			content,
			dynamic,
			spread: dynamic && ROUTE_SPREAD.test(content)
		});
	});
	return result;
}