mirror of
https://github.com/vercel-labs/scriptc.git
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317 lines
7.6 KiB
JavaScript
317 lines
7.6 KiB
JavaScript
// Generates string-method test cases with Node as the oracle.
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// Each line: <op>\t<input-hex>\t<args>\t<expected-hex>
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//
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// node gen-string-cases.mjs > string-cases.txt
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//
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// All strings are hex-encoded bytes of scriptc's string storage ("-" =
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// empty) so the file is unambiguous: UTF-8, with each lone surrogate (charAt
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// on half an astral pair, slice boundaries splitting a pair) as its 3-byte
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// WTF-8 encoding. Numeric args use String(x) (strtod-parseable, including
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// "NaN"/"Infinity"/"-Infinity"); numeric/boolean expected values are the
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// hex of String(result), which the C side reproduces via scr_f64_to_str
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// (itself fuzz-verified against Node) or "true"/"false".
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import { stdout } from "node:process";
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const hex = (str) => {
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const parts = [];
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for (const ch of str) {
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const unit = ch.charCodeAt(0);
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parts.push(
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ch.length === 1 && unit >= 0xd800 && unit <= 0xdfff
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? Buffer.from([0xed, 0x80 | ((unit >> 6) & 0x3f), 0x80 | (unit & 0x3f)])
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: Buffer.from(ch, "utf8"),
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);
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}
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const b = Buffer.concat(parts);
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return b.length ? b.toString("hex") : "-";
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};
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const num = (x) => String(x); // NaN / Infinity / -Infinity / -0 -> "0": all fine
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const strings = [
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// ASCII
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"",
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"a",
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"Z",
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"abc",
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"abab",
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"ababab",
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"aXbXc",
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"hello world",
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"Hello, World! 123",
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"abc\0def", // embedded NUL (valid UTF-8; len-based, not strlen-based)
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// whitespace / trim material
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" ",
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" padded ",
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"\t\r\n x \n\r\t",
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// the full JS WhiteSpace + LineTerminator set around a payload
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"\t\n\v\f\r
\uFEFFw s \uFEFF \t",
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"\u200B", // ZERO WIDTH SPACE is NOT JS whitespace — must survive trim
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" \u{1F600} ", // astral payload inside whitespace
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// Latin-1 / 2-byte UTF-8
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"é",
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"café",
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"naïve über",
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// 3-byte UTF-8: CJK and BMP edges
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"你好世界",
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"日本語テスト",
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"你好world",
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"�", // pre-existing replacement char (distinct from divergence output!)
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"", // private use + max BMP
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"a
b
c", // line separators mid-string
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// astral (4-byte UTF-8, surrogate pairs in JS)
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"\u{1F600}",
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"a\u{1F600}b",
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"\u{1F600}\u{1F601}\u{1F602}",
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"x\u{1F600}\u{1F600}y",
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"\u{10000}",
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"\u{10FFFF}",
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"a\u{10FFFF}",
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"\u{1F1FA}\u{1F1F8}", // regional indicators (flag)
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// combining marks
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"é",
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"café",
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"à́̂b",
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// mixed everything
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"mixed é中\u{1F600}é end",
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"\u{1F600} café 世界 é!",
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];
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const lines = new Set();
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function emit(op, input, args, expected) {
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lines.add(`${op}\t${hex(input)}\t${args}\t${expected}`);
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}
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// Pin conversion and early exhaustion separately from the broad method
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// oracle: limits can stop between the surrogate halves of an astral unit.
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for (const [input, separator] of [
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["", ","],
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[",a,,b,", ","],
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["ababa", "aba"],
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["a\0b\0", "\0"],
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["a😀b", ""],
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]) {
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for (const limit of [0, 1, 2, 3, 7, -1, 1.9, NaN, Infinity, 4294967296, 4294967297]) {
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const pieces = input.split(separator, limit);
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emit(
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"splitLimit",
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input,
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`${hex(separator)},${num(limit)}`,
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hex(`${pieces.length}:${pieces.join("\x01")}`),
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);
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}
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}
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for (const s of strings) {
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const L = s.length;
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const idxs = [
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...new Set([
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NaN,
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-Infinity,
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Infinity,
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-L - 5,
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-L - 1,
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-L,
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-L + 1,
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-3,
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-2,
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-1,
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-0.5,
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0,
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0.5,
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1,
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1.5,
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2,
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3,
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Math.floor(L / 2),
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L - 2,
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L - 1,
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L - 0.5,
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L,
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L + 1,
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L + 5,
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]),
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];
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emit("len", s, "-", hex(String(L)));
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emit("trim", s, "-", hex(s.trim()));
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emit("trimStart", s, "-", hex(s.trimStart()));
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emit("trimEnd", s, "-", hex(s.trimEnd()));
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// split(separator): expected is `${count}:${pieces.join("\x01")}` so
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// empty results ([] vs [""]) stay distinguishable; \x01 appears in no
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// corpus string. Lone-surrogate pieces (empty separator over astral
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// chars) hex as their WTF-8 bytes.
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for (const sep of new Set([
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"",
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",",
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"a",
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"X",
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" ",
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"é",
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"世",
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"\u{1F600}",
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s.slice(0, 1),
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s.slice(1, 3),
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s,
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])) {
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if (!sep.isWellFormed()) continue;
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const pieces = s.split(sep);
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emit("split", s, hex(sep), hex(`${pieces.length}:${pieces.join("\x01")}`));
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}
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// padStart/padEnd: targets around the length, fills of 1..n units
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// including astral fills the truncation can split (the lone high
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// surrogate JS keeps).
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for (const target of [NaN, -3, 0, 1, L - 1, L, L + 1, L + 3, L + 7, L + 0.5, 2 * L + 3])
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for (const fill of ["", " ", "0", "ab", "xyz", "é", "\u{1F600}", "a\u{1F600}"]) {
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emit("padStart", s, `${num(target)},${hex(fill)}`, hex(s.padStart(target, fill)));
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emit("padEnd", s, `${num(target)},${hex(fill)}`, hex(s.padEnd(target, fill)));
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}
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for (const i of idxs) {
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emit("charCodeAt", s, num(i), hex(String(s.charCodeAt(i))));
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emit("charAt", s, num(i), hex(s.charAt(i)));
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}
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for (const a of idxs)
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for (const b of idxs) emit("slice", s, `${num(a)},${num(b)}`, hex(s.slice(a, b)));
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// needles: derived substrings (only well-formed ones — a needle with a
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// lone surrogate cannot exist as a scriptc string) plus fixed probes
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const needles = [
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...new Set(
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[
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"",
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"a",
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"b",
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"X",
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"z!",
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s,
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s + " ",
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s.slice(0, 1),
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s.slice(0, 2),
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s.slice(1, 3),
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s.slice(-1),
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s.slice(-2),
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s.slice(2, -1),
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"\u{1F600}",
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"世",
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"é",
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"é",
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"́",
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" ",
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].filter((n) => n.isWellFormed()),
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),
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];
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const fromIdxs = [
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...new Set([
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NaN,
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-Infinity,
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Infinity,
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-5,
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-1,
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0,
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1,
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1.5,
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2,
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Math.floor(L / 2),
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L - 1,
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L,
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L + 5,
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]),
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];
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for (const n of needles) {
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emit("includes", s, hex(n), hex(String(s.includes(n))));
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emit("startsWith", s, hex(n), hex(String(s.startsWith(n))));
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emit("endsWith", s, hex(n), hex(String(s.endsWith(n))));
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emit("lastIndexOf", s, hex(n), hex(String(s.lastIndexOf(n))));
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for (const f of fromIdxs)
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emit("indexOf", s, `${hex(n)},${num(f)}`, hex(String(s.indexOf(n, f))));
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}
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// valid repeat counts only; count < 0 / Infinity -> RangeError -> abort,
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// covered by the crash test in string.test.ts
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for (const c of [0, 1, 2, 3, 7, 2.9, 0.5, -0.5, NaN]) emit("repeat", s, num(c), hex(s.repeat(c)));
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}
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// parseInt(s, radix): args = String(radix) (strtod-parseable), expected =
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// hex of String(result) — the C side formats through scr_f64_to_str,
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// itself fuzz-verified against Node, so correctly-rounded bignum results
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// compare exactly. String(-0) is "0" on both sides; the -0 SIGN is pinned
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// by the differential corpus instead.
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const parseIntInputs = [
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"",
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" ",
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"0",
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"-0",
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"+0",
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"42",
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" 42 ",
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"\t\n-17",
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"+99",
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"3.9",
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"1e3",
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"0x1F",
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"0X1f",
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"-0x20",
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" +0xAb",
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"0x",
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"0xG",
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"08",
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"079",
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"ff",
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"FF",
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"zz",
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"z!",
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"101",
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"777",
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"12abc",
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"abc12",
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"-",
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"+",
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" - 1",
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"١٢٣",
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"Infinity",
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"NaN",
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"9007199254740993",
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"18446744073709551617",
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"123456789012345678901234567890",
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"9".repeat(40),
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"1" + "0".repeat(308),
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"1" + "0".repeat(309),
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"-1" + "0".repeat(400),
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"0".repeat(50) + "7",
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"deadbeefdeadbeefdeadbeefdeadbeef",
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"7".repeat(30),
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"1".repeat(80),
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"
1
",
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" 42",
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"42\0",
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"1_000",
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];
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const radices = [
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undefined,
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0,
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2,
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8,
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10,
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16,
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36,
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1,
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37,
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-1,
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16.9,
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NaN,
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Infinity,
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-Infinity,
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2.5,
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4294967312,
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-4294967280,
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35,
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];
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for (const s of parseIntInputs)
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for (const r of radices)
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emit("parseInt", s, r === undefined ? "0" : num(r), hex(String(parseInt(s, r))));
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stdout.write([...lines].join("\n") + "\n");
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