// re2rust $INPUT -o $OUTPUT -f
use std::fs::File;
use std::io::{Read, Write};
const DEBUG: bool = false;
macro_rules! log {
($($fmt:expr)? $(, $args:expr)*) => {
if DEBUG { println!($($fmt)? $(, $args)*) }
}
}
// Use a small buffer to cover the case when a lexeme doesn't fit.
// In real world use a larger buffer.
const BUFSIZE: usize = 10;
struct State {
file: File,
yyinput: [u8; BUFSIZE],
yylimit: usize,
yycursor: usize,
yymarker: usize,
token: usize,
yystate: isize,
}
#[derive(Debug, PartialEq)]
enum Status {End, Ready, Waiting, BadPacket, BigPacket}
fn fill(st: &mut State) -> Status {
// Error: lexeme too long. In real life can reallocate a larger buffer.
if st.token < 1 { return Status::BigPacket; }
// Shift buffer contents (discard everything up to the current lexeme).
st.yyinput.copy_within(st.token..st.yylimit, 0);
st.yylimit -= st.token;
re2c version: 4.1~8baaca577
Select example "rust/state/push.re"