@shikijs/engine-javascript/dist/scanner-BFcBmQR1.mjs

Engine for Shiki using JavaScript's native RegExp

//#region src/scanner.ts
const MAX = 4294967295;
var JavaScriptScanner = class {
	regexps;
	constructor(patterns, options = {}) {
		this.patterns = patterns;
		this.options = options;
		const { forgiving = false, cache, regexConstructor } = options;
		if (!regexConstructor) throw new Error("Option `regexConstructor` is not provided");
		this.regexps = patterns.map((p) => {
			if (typeof p !== "string") return p;
			const cached = cache?.get(p);
			if (cached) {
				if (cached instanceof RegExp) return cached;
				if (forgiving) return null;
				throw cached;
			}
			try {
				const regex = regexConstructor(p);
				cache?.set(p, regex);
				return regex;
			} catch (e) {
				cache?.set(p, e);
				if (forgiving) return null;
				throw e;
			}
		});
	}
	findNextMatchSync(string, startPosition, _options) {
		const str = typeof string === "string" ? string : string.content;
		const pending = [];
		function toResult(index, match, offset = 0) {
			return {
				index,
				captureIndices: match.indices.map((indice) => {
					if (indice == null) return {
						start: MAX,
						end: MAX,
						length: 0
					};
					return {
						start: indice[0] + offset,
						end: indice[1] + offset,
						length: indice[1] - indice[0]
					};
				})
			};
		}
		for (let i = 0; i < this.regexps.length; i++) {
			const regexp = this.regexps[i];
			if (!regexp) continue;
			try {
				regexp.lastIndex = startPosition;
				const match = regexp.exec(str);
				if (!match) continue;
				if (match.index === startPosition) return toResult(i, match, 0);
				pending.push([
					i,
					match,
					0
				]);
			} catch (e) {
				if (this.options.forgiving) continue;
				throw e;
			}
		}
		if (pending.length) {
			const minIndex = Math.min(...pending.map((m) => m[1].index));
			for (const [i, match, offset] of pending) if (match.index === minIndex) return toResult(i, match, offset);
		}
		return null;
	}
};

//#endregion
export { JavaScriptScanner as t };