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libcore: add splitn to split a string N times.

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This commit is contained in:
Erick Tryzelaar
2011-12-19 10:08:36 -08:00
parent 8e54e74be4
commit 02d84d89e0
2 changed files with 59 additions and 18 deletions
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36
src/libcore/str.rs
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@@ -6,11 +6,11 @@ String manipulation.
export eq, lteq, hash, is_empty, is_not_empty, is_whitespace, byte_len,
byte_len_range, index,
rindex, find, starts_with, ends_with, substr, slice, split, split_str,
concat, connect, to_upper, replace, char_slice, trim_left, trim_right,
trim, unshift_char, shift_char, pop_char, push_char, is_utf8,
from_chars, to_chars, char_len, char_len_range, char_at, bytes,
is_ascii, shift_byte, pop_byte,
rindex, find, starts_with, ends_with, substr, slice, split, splitn,
split_str, concat, connect, to_upper, replace, char_slice, trim_left,
trim_right, trim, unshift_char, shift_char, pop_char, push_char,
is_utf8, from_chars, to_chars, char_len, char_len_range, char_at,
bytes, is_ascii, shift_byte, pop_byte,
unsafe_from_byte, unsafe_from_bytes, from_char, char_range_at,
str_from_cstr, sbuf, as_buf, push_byte, utf8_char_width, safe_slice,
contains, iter_chars, loop_chars, loop_chars_sub,
@@ -744,6 +744,32 @@ fn split(s: str, sep: u8) -> [str] {
ret v;
}
/*
Function: splitn
Split a string at each occurance of a given separator up to count times.
Returns:
A vector containing all the strings between each occurance of the separator
*/
fn splitn(s: str, sep: u8, count: uint) -> [str] {
let v = [];
let accum = "";
let n = count;
let ends_with_sep: bool = false;
for c in s {
if n > 0u && c == sep {
n -= 1u;
v += [accum];
accum = "";
ends_with_sep = true;
} else { accum += unsafe_from_byte(c); ends_with_sep = false; }
}
if byte_len(accum) != 0u || ends_with_sep { v += [accum]; }
ret v;
}
/*
Function: split_str