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
|
// re2rust $INPUT -o $OUTPUT --no-unsafe -d
// Have to use Cell for cursor, otherwise borrow checker does not allow
// to have closures YYPEEK (that does immutable borrow of cursor) and
// YYSKIP (that does mutable borrow).
use std::cell::Cell;
#[allow(non_snake_case)]
fn lex(s: &[u8]) -> bool {
let cur = Cell::new(0);
let YYPEEK = || unsafe { *s.get_unchecked(cur.get()) };
let YYSKIP = || { cur.set(cur.get() + 1); };
let YYDEBUG = || { format!("lex: char '{}'", YYPEEK()); };
/*!re2c
re2c:api:style = functions;
re2c:define:YYCTYPE = u8;
re2c:yyfill:enable = 0;
alpha = [a-zA-Z];
ident = alpha (alpha | [0-9])*;
ident { return true; }
* { return false; }
*/
}
fn main() {
assert!(lex(b"qwerty42\0"));
}
|
