Merge main

tests/corpus/5550-locale-compare-ascii-words.ts

@@ -0,0 +1,35 @@
+// localeCompare over ASCII strings of every length from 0 to 24 (across
+// the eight-byte words the runtime compares at a time): a case, letter,
+// digit or punctuation difference at each position, a tab, newline or
+// carriage return at each position, and an accented letter at each
+// position, against Node.
+function sign(x: number): number {
+  return x < 0 ? -1 : x > 0 ? 1 : 0;
+}
+const base = "abcdefghijklmnopqrstuvwxyz";
+const swaps = ["A", "b", "0", "-", " ", "z", "\t", "\n", "\r", "é", "É"];
+let out = "";
+let equal = 0;
+for (let n = 0; n <= 24; n++) {
+  const s = base.slice(0, n);
+  for (let i = 0; i <= n; i++) {
+    for (const w of swaps) {
+      const t = s.slice(0, i) + w + s.slice(i + 1);
+      const u = s.slice(0, i) + w + s.slice(i);
+      for (const [x, y] of [[s, t], [t, s], [s, u], [u, s], [t, u], [t.toUpperCase(), t]]) {
+        const r = sign(x!.localeCompare(y!));
+        out += r + 1;
+        if (r === 0) equal++;
+      }
+    }
+  }
+}
+let hash = 2166136261;
+for (let i = 0; i < out.length; i++) hash = Math.imul(hash ^ out.charCodeAt(i), 16777619) >>> 0;
+console.log(out.length, equal, hash.toString(16));
+// Equal strings built separately, and prefixes of each other.
+const words = ["", "a", "ab", "abcdefg", "abcdefgh", "abcdefghi", "abcdefghijklmnop", "abcdefghijklmnopq"];
+for (const w of words) {
+  const copy = (w + "x").slice(0, w.length);
+  console.log(JSON.stringify(w), w.localeCompare(copy), w.localeCompare(w + "a"), (w + "a").localeCompare(w), w.toUpperCase().localeCompare(copy));
+}