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Chris Tate
a9b6dba424
* feat(string): support static split limits - Lower split limits for string and literal RegExp separators across C and LLVM. - Match JavaScript ToUint32 limit semantics in the runtime. - Add differential coverage and refresh diagnostics and surface metadata. * fix(string): default undefined split limits
48 lines
2.5 KiB
TypeScript
48 lines
2.5 KiB
TypeScript
// The STRING-separator split, static (no island): empty pieces at the
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// ends and between adjacent separators, multi-byte and multi-char
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// separators, the whole-string separator, the empty separator's
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// per-code-unit split, and results flowing into intrinsic array ops.
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const csv = "a,b,,c,";
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const parts = csv.split(",");
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console.log(parts.length, JSON.stringify(parts));
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console.log("aXbXc".split("X").join("-"), "aa".split("a").length);
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console.log(JSON.stringify("banana".split("an")), JSON.stringify("banana".split("na")));
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console.log(JSON.stringify("abc".split("abc")), JSON.stringify("abc".split("abcd")));
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console.log(JSON.stringify("".split(",")), "".split(",").length);
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console.log(JSON.stringify("".split("")), "".split("").length);
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console.log("abc".split("").join("|"), "abc".split("").length);
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// Unicode: multi-byte separators and pieces, per-unit split of BMP text.
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console.log("α😀β😀γ".split("😀").join("+"), "α😀β😀γ".split("😀").length);
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console.log("café société".split("é").join("<>"));
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console.log("你好世界".split("").join(" "), "你好世界".split("").length);
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console.log(JSON.stringify("日本語テスト".split("語")));
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// Chains stay static: split → map/filter/indexOf/includes.
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const words = "one two three".split(" ");
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console.log(words.length, words.indexOf("three"), words.includes("two"));
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const nums = "1,2,3,4".split(",").map((s) => parseInt(s, 10) * 2);
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console.log(nums.join(","));
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// The optional limit is ToUint32'd, and truncation happens before wrap.
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function limited(text: string, separator: string, limit: number): string {
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return JSON.stringify(text.split(separator, limit));
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}
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console.log(limited("a,b,,c,", ",", 0));
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console.log(limited("a,b,,c,", ",", 1), limited("a,b,,c,", ",", 3));
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console.log(limited("a,b,,c,", ",", 99), limited("a,b,,c,", ",", -1));
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console.log(limited("a,b,,c,", ",", 2.9), limited("a,b,,c,", ",", 4294967298));
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console.log(limited("a,b,,c,", ",", 4294967296), limited("a,b,,c,", ",", NaN));
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console.log(limited("abcd", "", 2), limited("", ",", 1));
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// Explicit and forwarded undefined are omission, with effects preserved.
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let limitEffects = 0;
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function undefinedLimit(): undefined {
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limitEffects++;
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return undefined;
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}
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function optionalLimit(limit?: number): string {
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return JSON.stringify("a,b,c".split(",", limit));
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}
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console.log(JSON.stringify("a,b,c".split(",", undefined)));
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console.log(JSON.stringify("a,b,c".split(",", undefinedLimit())), limitEffects);
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console.log(optionalLimit(), optionalLimit(undefined), optionalLimit(2));
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