mirror of
https://github.com/vercel-labs/scriptc.git
synced 2026-10-23 06:10:02 +08:00
Chris Tate
97a489845a
- Carry BigInts, Sets, and regular expressions through checked native storage without a JavaScript engine. - Preserve dictionary aliases, spreads, frozen metadata, and fluent initialization helpers. - Collect checked object and closure cycles while preserving live references.
39 lines
2.2 KiB
JavaScript
39 lines
2.2 KiB
JavaScript
const patterns = { caret: /(^|[^\[])\^/g };
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function edit(value, flags = "") {
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let source = typeof value == "string" ? value : value.source, builder = {
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replace: (pattern, replacement) => {
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let text = typeof replacement == "string" ? replacement : replacement.source;
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return text = text.replace(patterns.caret, "$1"), source = source.replace(pattern, text), builder;
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},
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getRegex: () => new RegExp(source, flags)
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};
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return builder;
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}
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console.log(edit(/^start end$/).replace("start", /hello/).replace("end", /world/).getRegex().test("hello world"));
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function identity(value) { return value; }
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const original = new RegExp("hello", "im");
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const boxed = identity(original);
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console.log(typeof original, typeof boxed, boxed.source, boxed.flags, boxed.ignoreCase, boxed.global);
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console.log(boxed === identity(original), String(boxed), Object.prototype.toString.call(boxed));
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console.log(boxed.test("HELLO"), boxed.test({ toString() { return "hello"; } }), boxed instanceof RegExp);
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console.log(new RegExp(boxed).flags, new RegExp(boxed, "g").flags);
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console.log(new RegExp(identity(undefined)).source);
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try { new RegExp(identity("[")); } catch (error) { console.log(error.name); }
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try { new RegExp(boxed, identity("ii")); } catch (error) { console.log(error.name); }
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function replace(source, pattern, text) { return source.replace(pattern, text); }
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console.log(replace("😀hello hello", /hello/g, "[$&]"));
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console.log(replace("hello hello", "hello", "$$$&"));
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console.log(edit(/^left right$/i, "i").replace(/left/g, /^hello/).replace("right", /^world/).getRegex().test("HELLO WORLD"));
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const own = { replace(value) { return "own:" + value; }, trim() { return "own trim"; } };
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console.log(own.replace("x"), own.trim());
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console.log(edit("^left right$").replace("left", /^hello/).replace("right", "world").getRegex().test("hello world"));
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console.log(new RegExp("a") === new RegExp("a"));
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const neverMatches = { exec: () => null };
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const mixedRules = { word: /hello/, fallback: neverMatches };
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console.log(mixedRules.word.test("hello"), mixedRules.fallback.exec(), mixedRules.fallback === neverMatches);
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const copiedRules = { ...mixedRules, word: /world/ };
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console.log(copiedRules.word.test("world"), mixedRules.word.test("hello"), copiedRules.fallback === neverMatches);
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