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core::str: added index (char)

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This commit is contained in:
Kevin Cantu 2012-02-11 03:04:12 -08:00
parent a131b430a0
commit 14baf88f89
1 changed files with 27 additions and 0 deletions
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27
src/libcore/str.rs
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@ -870,6 +870,30 @@ fn lines_iter(ss: str, ff: fn(&&str)) {
Section: Searching Section: Searching
*/ */
// Function: index
//
// Returns the index of the first matching char
// (as option some/none)
fn index(ss: str, cc: char) -> option<uint> {
let bii = 0u;
let cii = 0u;
let len = byte_len(ss);
while bii < len {
let {ch, next} = char_range_at(ss, bii);
// found here?
if ch == cc {
ret option::some(cii);
}
cii += 1u;
bii = next;
}
// wasn't found
ret option::none;
}
/* /*
Function: index Function: index
@ -1448,6 +1472,9 @@ mod tests {
assert (index_byte("hello", 'e' as u8) == 1); assert (index_byte("hello", 'e' as u8) == 1);
assert (index_byte("hello", 'o' as u8) == 4); assert (index_byte("hello", 'o' as u8) == 4);
assert (index_byte("hello", 'z' as u8) == -1); assert (index_byte("hello", 'z' as u8) == -1);
assert (index("hello", 'e') == option::some(1u));
assert (index("hello", 'o') == option::some(4u));
assert (index("hello", 'z') == option::none);
assert (rindex_byte("hello", 'l' as u8) == 3); assert (rindex_byte("hello", 'l' as u8) == 3);
assert (rindex_byte("hello", 'h' as u8) == 0); assert (rindex_byte("hello", 'h' as u8) == 0);
assert (rindex_byte("hello", 'z' as u8) == -1); assert (rindex_byte("hello", 'z' as u8) == -1);