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Mini Shell
Mini Shell
// re2rust $INPUT -o $OUTPUT --input-encoding utf8
// This example supports multiple input encodings: UTF-8 and UTF-32.
// Both lexers are generated from the same rules block, and the use
// blocks add only encoding-specific configurations.
/*!rules:re2c
re2c:yyfill:enable = 0;
re2c:define:YYPEEK = "*str.get_unchecked(cur)";
re2c:define:YYSKIP = "cur += 1;";
re2c:define:YYBACKUP = "mar = cur;";
re2c:define:YYRESTORE = "cur = mar;";
"∀x ∃y" { return Some(cur); }
* { return None; }
*/
fn lex_utf8(str: &[u8]) -> Option<usize> {
let (mut cur, mut mar) = (0, 0);
/*!use:re2c
re2c:encoding:utf8 = 1;
re2c:define:YYCTYPE = u8;
*/
}
fn lex_utf32(str: &[u32]) -> Option<usize> {
let (mut cur, mut mar) = (0, 0);
/*!use:re2c
re2c:encoding:utf32 = 1;
re2c:define:YYCTYPE = u32;
*/
}
fn main() {
let s8 = vec![0xe2, 0x88, 0x80, 0x78, 0x20, 0xe2, 0x88, 0x83, 0x79];
assert_eq!(lex_utf8(&s8), Some(s8.len()));
let s32 = vec![0x2200, 0x78, 0x20, 0x2203, 0x79];
assert_eq!(lex_utf32(&s32), Some(s32.len()));
}
Zerion Mini Shell 1.0