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Add _str.starts_with and ends_with.

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This commit is contained in:
Graydon Hoare 2011-01-03 20:39:33 -08:00
parent 546f1e98cb
commit 001d7bfa17
1 changed files with 29 additions and 0 deletions
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29
src/lib/_str.rs
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@ -188,6 +188,35 @@ fn find(str haystack, str needle) -> int {
ret -1;
}
fn starts_with(str haystack, str needle) -> bool {
let uint haystack_len = byte_len(haystack);
let uint needle_len = byte_len(needle);
if (needle_len == 0u) {
ret true;
}
if (needle_len > haystack_len) {
ret false;
}
ret eq(substr(haystack, 0u, needle_len), needle);
}
fn ends_with(str haystack, str needle) -> bool {
let uint haystack_len = byte_len(haystack);
let uint needle_len = byte_len(needle);
if (needle_len == 0u) {
ret true;
}
if (needle_len > haystack_len) {
ret false;
}
ret eq(substr(haystack,
haystack_len - needle_len,
needle_len),
needle);
}
fn substr(str s, uint begin, uint len) -> str {
let str accum = "";
let uint i = begin;