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lib/strings+test: graduate contains to Hare (str|rune)... variadic (#9)

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contains(haystack, needle: (str|rune)) -> contains(haystack: str,
needles: (str|rune)...) bool per ref/hare/strings/contains.ha:9.

Body: for-loop over needles.len; inner match (needles[i]) dispatches
byteindex(haystack, s|r); early return true on hit; fall-through
return false. Hare's match-yield + if (matched) return true collapses
naturally given byteindex's (i32|void) shape (Hare uses bytes::contains
-> bool). 0-arg returns false per Hare spec.

Unblocked by: #8 (5ed6293 varargseq per cgcall), #12 (cbf1042 sum-tag
forward), #15 (5609d04 frame-strategy), #16 (d9b0c90 callee_variadic_
param N_DOT). All four landed this session; #9 exercises every
unblocker. The cross-module same-leaf collision with bytes.contains
(non-variadic) is closed by #16's fnparamslookupmod re-routing —
existing 750 sentinel row bytes_strings_contains continues to pass.

contains_cases adds 6 variadic rows (signalled 1600+i): 0-arg,
1-arg str, 1-arg rune, 3-arg mixed (middle hits), 3-arg all-miss,
multibyte mixed (heart-é via 0xE9u32: rune per single-byte lexrune
precedent at hasprefix_cases:115).

Module-header divergence note for contains removed; lib/bytes
whitespace-default note retained for future bytes graduation.

make test 126/126; ww2==ww3==ww4 byte-id holds via 995_self_rebuild.
This commit is contained in:
Hojun-Cho
2026-05-19 05:08:57 +09:00
parent d9b0c90fbc
commit 7c5463c7d9
5 changed files with 94 additions and 44 deletions
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31
lib/strings/strings.ww
View File

@@ -7,10 +7,6 @@
// Hare strips ASCII whitespace via `bytes::ltrim(input,
// whitespace...)`; that needs `lib/bytes` variadic graduation
// (future commit).
// - `contains` is non-variadic. Hare's is
// `contains(haystack, needles: (str | rune)...)`
// (ref/hare/strings/contains.ha:9). Gated on `(str|rune)...`
// tagged-variadic gather + runtime — task #5.
// - `byteindex` / `rbyteindex` rune arms encode via
// `utf8.encoderune`; the legacy impls scanned for `r: u8` (an
// undocumented ASCII-only restriction that silently dropped
@@ -293,13 +289,26 @@ export fn rindex(haystack: str, needle: (str | rune)) (i32 | void) = {
return;
};
// contains — true iff `needle` occurs in `haystack`.
// ref/hare/strings/contains.ha:9 (subset: Hare's variadic form
// `(needles: (str | rune)...)` blocks on task #16).
export fn contains(haystack: str, needle: (str | rune)) bool = {
match (byteindex(haystack, needle)) {
case let i: i32 => return true;
case void => return false;
// contains — true iff any of `needles` occurs in `haystack`.
// ref/hare/strings/contains.ha:9.
export fn contains(haystack: str, needles: (str | rune)...) bool = {
let i: i32 = 0;
for (i < needles.len) {
match (needles[i]) {
case let s: str => {
match (byteindex(haystack, s)) {
case let bo: i32 => return true;
case void => void;
};
};
case let r: rune => {
match (byteindex(haystack, r)) {
case let bo: i32 => return true;
case void => void;
};
};
};
i += 1;
};
return false;
};

14
lib/strings/stringstest.ww
View File

@@ -139,6 +139,20 @@ fn streq(a: str, b: str) bool = {
if ( strings.contains("hello world", "foobar")) { fail(); };
if (!strings.contains("こんにちは", 0x306Bu32: rune)) { fail(); }; // 'に'
if (!strings.contains("こんにちは", "ちは")) { fail(); };
// Variadic rows. ref/hare/strings/contains.ha:27.
signalled = 1600;
if ( strings.contains("hello")) { fail(); };
signalled = 1601;
if (!strings.contains("hello world", "world")) { fail(); };
signalled = 1602;
if (!strings.contains("hello", 'l')) { fail(); };
signalled = 1603;
if (!strings.contains("hello world", "foo", "world", 'x')) { fail(); };
signalled = 1604;
if ( strings.contains("hello", "foo", 'z', "bar")) { fail(); };
signalled = 1605;
if (!strings.contains("héllo", "x", 0xE9u32: rune)) { fail(); };
};
// ---- byteindex --------------------------------------------------------