Hojun-Cho/ww
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

lib/strings+test: compare returns int, not i32

Browse Source 
Hare's strings::compare returns int (ref/hare/strings/compare.ha:12).
Result is a sign, not an index, so the i32 was cargo-culted from the
str-index type. Callsites already compared against 0, so callers
needed no migration. Widened the two return-site casts (u8→int,
i32→int) — the latter avoids i32 underflow on adversarial length
diffs. Added a multibyte test row contrasting ASCII vs UTF-8 lead
byte to exercise the high-bit-operand path.
This commit is contained in:
Hojun-Cho
2026-05-19 22:39:05 +09:00
parent 031f5f9ec8
commit f827429215
5 changed files with 25 additions and 20 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
lib/strings/strings.ww
View File

@@ -52,17 +52,18 @@ export fn fromutf8_unsafe(in: []u8) str = {
return r;
};
// compare — three-way bytewise codepoint-order comparison.
// ref/hare/strings/compare.ha:12.
export fn compare(a: str, b: str) i32 = {
// compare — three-way bytewise codepoint-order comparison. Return is
// a sign (neg/zero/pos), not an index, so it tracks Hare's `int`
// rather than the str-index i32 (#8). ref/hare/strings/compare.ha:12.
export fn compare(a: str, b: str) int = {
let n: i32 = a.len;
if (b.len < n) { n = b.len; };
let i: i32 = 0;
for (i < n) {
if (a[i] != b[i]) { return (a[i]: i32) - (b[i]: i32); };
if (a[i] != b[i]) { return (a[i]: int) - (b[i]: int); };
i += 1;
};
return a.len - b.len;
return (a.len: int) - (b.len: int);
};
// dup — allocate a fresh copy of `s`. Caller releases with

1
lib/strings/stringstest.ww
View File

@@ -584,6 +584,7 @@ fn streq(a: str, b: str) bool = {
if (strings.compare("AB", "ABC") >= 0) { fail(); };
if (strings.compare("BCD", "ABC") <= 0) { fail(); };
if (strings.compare("ABC", "abc") >= 0) { fail(); };
if (strings.compare("ABC", "こんにちは") >= 0) { fail(); };
};
// ---- sub / bytesub ----------------------------------------------------