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https://github.com/vercel-labs/scriptc.git
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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
1.7 KiB
TypeScript
48 lines
1.7 KiB
TypeScript
// split(regex) — capture-free patterns (captures are fenced).
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function show(parts: string[]): string {
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return parts.length + ":[" + parts.join("|") + "]";
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}
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console.log(show("a1b2c".split(/\d/)));
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console.log(show("one, two,three , four".split(/\s*,\s*/)));
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// Empty pattern separates every UTF-16 unit; empty subjects.
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console.log(show("abc".split(/(?:)/)));
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console.log(show("".split(/(?:)/)));
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console.log(show("".split(/x/)));
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// No match: one piece, the whole string.
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console.log(show("abc".split(/z/)));
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// Leading/trailing/adjacent separators produce empty pieces.
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console.log(show(",a,,b,".split(/,/)));
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// A match that can be empty: zero-length matches advance, and a match
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// ending at the end of the string leaves a trailing empty piece.
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console.log(show("ab".split(/b*/)));
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console.log(show("aXbXXc".split(/X*/)));
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// Sticky separators probe positions like the spec's matcher.
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console.log(show("abab".split(/b/y)));
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// The g flag is irrelevant to split (the spec builds its own matcher).
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console.log(show("a1b2c".split(/\d/g)));
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// split on a longer text, then feed pieces back through replace.
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const csv = "name;age;city";
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const cols = csv.split(/;/);
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console.log(show(cols), cols[1].replace(/a/, "A"));
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// The optional limit shares split's ToUint32 rules with string separators.
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console.log(show("a1b2c3".split(/\d/, 0)));
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console.log(show("a1b2c3".split(/\d/, 1)), show("a1b2c3".split(/\d/, 3)));
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console.log(show("abc".split(/(?:)/, 2)));
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console.log(show("a1b2c3".split(/\d/, 4294967298)));
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console.log(show("a1b2c3".split(/\d/, -1)));
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function optionalLimit(limit?: number): string {
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return show("a1b2c3".split(/\d/, limit));
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}
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console.log(show("a1b2c3".split(/\d/, undefined)));
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console.log(optionalLimit(), optionalLimit(undefined), optionalLimit(2));
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