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Merge pull request #4192 from laytan/strings-substring-rune-wise

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strings: add `substring`, `substring_to` and `substring_from`
This commit is contained in:
Jeroen van Rijn
2024-09-03 22:47:56 +02:00
committed by GitHub
parent 6bbc165121 597ba796b7
commit 645207b8b0
2 changed files with 135 additions and 1 deletions
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tests/core/strings/test_core_strings.odin
+32 -1
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@@ -124,4 +124,35 @@ test_case_conversion :: proc(t: ^testing.T) {
testing.expectf(t, result == entry.s, "ERROR: Input `{}` to converter {} does not match `{}`, got `{}`.\n", test_case.s, case_kind, entry.s, result)
}
}
}
}
@(test)
test_substring :: proc(t: ^testing.T) {
Case :: struct {
s: string,
start: int,
end: int,
sub: string,
ok: bool,
}
cases := []Case {
{ok = true},
{s = "", start = -1, ok = false},
{s = "", end = -1, ok = false},
{s = "", end = +1, ok = false},
{s = "Hello", end = len("Hello"), sub = "Hello", ok = true},
{s = "Hello", start = 1, end = len("Hello"), sub = "ello", ok = true},
{s = "Hello", start = 1, end = len("Hello") - 1, sub = "ell", ok = true},
{s = "Hello", end = len("Hello") + 1, sub = "Hello", ok = false},
{s = "小猫咪", start = 0, end = 3, sub = "小猫咪", ok = true},
{s = "小猫咪", start = 1, end = 3, sub = "猫咪", ok = true},
{s = "小猫咪", start = 1, end = 5, sub = "猫咪", ok = false},
{s = "小猫咪", start = 1, end = 1, sub = "", ok = true},
}
for tc in cases {
sub, ok := strings.substring(tc.s, tc.start, tc.end)
testing.expectf(t, ok == tc.ok, "expected %v[%v:%v] to return ok: %v", tc.s, tc.start, tc.end, tc.ok)
testing.expectf(t, sub == tc.sub, "expected %v[%v:%v] to return sub: %v, got: %v", tc.s, tc.start, tc.end, tc.sub, sub)
}
}