blob: 807edf314bb1225ef23afcec1e7afa01b397fe4a (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
|
import rustrt.sbuf;
import std._vec.rustrt.vbuf;
native "rust" mod rustrt {
type sbuf;
fn str_buf(str s) -> sbuf;
fn str_byte_len(str s) -> uint;
fn str_alloc(uint n_bytes) -> str;
fn str_from_vec(vec[u8] b) -> str;
fn refcount[T](str s) -> uint;
}
fn is_utf8(vec[u8] v) -> bool {
fail; // FIXME
}
fn is_ascii(str s) -> bool {
let uint i = byte_len(s);
while (i > 0u) {
i -= 1u;
if ((s.(i) & 0x80u8) != 0u8) {
ret false;
}
}
ret true;
}
fn alloc(uint n_bytes) -> str {
ret rustrt.str_alloc(n_bytes);
}
// Returns the number of bytes (a.k.a. UTF-8 code units) in s.
// Contrast with a function that would return the number of code
// points (char's), combining character sequences, words, etc. See
// http://icu-project.org/apiref/icu4c/classBreakIterator.html for a
// way to implement those.
fn byte_len(str s) -> uint {
ret rustrt.str_byte_len(s);
}
fn buf(str s) -> sbuf {
ret rustrt.str_buf(s);
}
fn bytes(str s) -> vec[u8] {
/* FIXME (issue #58):
* Should be...
*
* fn ith(str s, uint i) -> u8 {
* ret s.(i);
* }
* ret _vec.init_fn[u8](bind ith(s, _), byte_len(s));
*
* but we do not correctly decrement refcount of s when
* the binding dies, so we have to do this manually.
*/
let uint n = _str.byte_len(s);
let vec[u8] v = _vec.alloc[u8](n);
let uint i = 0u;
while (i < n) {
v += vec(s.(i));
i += 1u;
}
ret v;
}
fn from_bytes(vec[u8] v) : is_utf8(v) -> str {
ret rustrt.str_from_vec(v);
}
fn refcount(str s) -> uint {
// -1 because calling this function incremented the refcount.
ret rustrt.refcount[u8](s) - 1u;
}
|