// re2js $INPUT -o $OUTPUT -f
const fs = require('fs')
// Use a small buffer to cover the case when a lexeme doesn't fit.
// In real world use a larger buffer.
const BUFSIZE = 10
const DEBUG = false
const END = 0
const READY = 1
const WAITING = 2
const BIG_PACKET = 3
const BAD_PACKET = 4
function log() {
if (DEBUG) console.log.apply(console, arguments)
}
function fill(st) {
// Error: lexeme too long. In real life could reallocate a larger buffer.
if (st.token < 1) return BIG_PACKET
// Shift buffer contents (discard everything up to the current token).
st.yyinput.copy(st.yyinput, 0, st.token, st.yylimit)
st.yycursor -= st.token;
st.yymarker -= st.token;
st.yylimit -= st.token;
st.token = 0;
// Read a new chunk of data from file and append it to `yyinput`.
let want = BUFSIZE - st.yylimit - 1 // -1 for sentinel
let nread = fs.readSync(st.file, st.yyinput, st.yylimit, want)
st.yylimit += nread
st.yyinput.writeUInt8(0, st.yylimit) // sentinel
return READY
re2c version: 4.1~8baaca577
Select example "js/state/push.re"