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core: rewrite str::byte_index to use vec functions

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This commit is contained in:
Erick Tryzelaar 2012-02-15 18:26:10 -08:00
parent d1c9b160ad
commit 042a5222d1
2 changed files with 16 additions and 8 deletions
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21
src/libcore/str.rs
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@ -71,6 +71,7 @@ export
// Searching
index,
byte_index,
byte_index_from,
rindex,
find,
find_bytes,
@ -859,13 +860,19 @@ fn index(ss: str, cc: char) -> option<uint> {
//
// Returns the index of the first matching byte
// (as option some/none)
fn byte_index(s: str, b: u8, start: uint) -> option<uint> {
let i = start, l = len_bytes(s);
while i < l {
if s[i] == b { ret some(i); }
i += 1u;
}
ret none;
fn byte_index(s: str, b: u8) -> option<uint> {
byte_index_from(s, b, 0u, len_bytes(s))
}
// Function: byte_index_from
//
// Returns the index of the first matching byte within the range [`start`,
// `end`).
// (as option some/none)
fn byte_index_from(s: str, b: u8, start: uint, end: uint) -> option<uint> {
assert end <= len_bytes(s);
str::as_bytes(s) { |v| vec::position_from(v, start, end) { |x| x == b } }
}
// Function: rindex