mirror of
https://github.com/vercel-labs/scriptc.git
synced 2026-11-01 07:33:12 +08:00
Chris Tate
c7f4cb1d42
- Extend safe borrowing across expressions and direct helpers. - Remove redundant ownership work and avoid materializing regex predicate results. - Support native regex string conversion with consistent flag ordering.
73 lines
2.9 KiB
TypeScript
73 lines
2.9 KiB
TypeScript
class Search {
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pattern: RegExp;
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text: string;
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replacement: string;
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constructor() {
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this.pattern = /a/g;
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this.text = "ab".repeat(3);
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this.replacement = "x".repeat(2);
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}
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}
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function scan(search: Search): void {
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console.log(search.pattern.test(search.text), search.pattern.lastIndex);
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console.log(search.pattern.test(search.text), search.pattern.lastIndex);
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console.log(search.pattern.source, search.pattern.flags, search.pattern.toString());
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console.log(search.text.search(search.pattern), search.pattern.lastIndex);
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console.log(search.text.replace(search.pattern, search.replacement));
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console.log(search.text.split(search.pattern, 3).join("|"));
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console.log(search.text.match(search.pattern)?.join("|"));
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}
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function swapText(search: Search): string { search.text = "changed"; return "z"; }
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function swapPattern(search: Search): string { search.pattern = /x/g; return "a"; }
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function clear(search: Search): string {
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search.text = "cleared";
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search.pattern = /z/g;
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throw new Error("replacement failed");
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}
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function work(): void {
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const search = new Search();
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scan(search);
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console.log(search.text.replace(search.pattern, swapText(search)), search.text);
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console.log(search.pattern.test(swapPattern(search)), search.pattern.lastIndex);
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const match = "ab".repeat(2).match(search.pattern);
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console.log(match === null);
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try { console.log(search.text.replace(search.pattern, clear(search))); }
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catch (error) { console.log((error as Error).message); }
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console.log(search.pattern.test(search.text), search.text);
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const all = "a1a2".replaceAll(/a/g, "b");
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console.log(all);
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for (const found of "a1a2".matchAll(/a\d/g)) console.log(found[0]);
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}
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work();
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console.log(new RegExp("", "mi").toString());
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console.log(new RegExp("a/b\n", "yg").toString());
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console.log(String(/a\/b/g) === /a\/b/g.toString());
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function sameState(pattern: string, flags: string, text: string, start: number): void {
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const predicate = new RegExp(pattern, flags);
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const capture = new RegExp(pattern, flags);
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predicate.lastIndex = start;
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capture.lastIndex = start;
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for (let i = 0; i < 3; i++) {
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console.log(predicate.test(text), capture.exec(text) !== null,
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Object.is(predicate.lastIndex, capture.lastIndex), predicate.lastIndex);
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}
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console.log(predicate.flags, predicate.toString());
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}
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sameState("a", "g", "aba", -2);
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sameState("a", "y", "ba", 1.9);
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sameState("a", "", "aba", Infinity);
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sameState("a", "g", "aba", Infinity);
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sameState("a", "g", "aba", NaN);
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sameState("(?:)", "g", "", -0);
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sameState(".", "gu", "a😀é", 1);
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sameState(".", "g", "😀", 0);
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sameState("(a)?(b)\\2", "ig", "abbA", 0);
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sameState("(?<=a)b", "g", "abcb", 0);
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sameState("(a?)".repeat(40), "gy", "a".repeat(40), 0);
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sameState("é", "g", "a".repeat(31) + "é", 0);
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sameState("é", "g", "a".repeat(32) + "é", 0);
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sameState("z", "u", "a".repeat(129), 0);
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sameState("a+", "g", "a".repeat(256), 0);
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sameState("a+", "g", "a".repeat(257), 0);
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