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Dir : ~/usr/share/doc/re2c/examples/go/state/

Edit File: push.go

// Code generated by re2c, DO NOT EDIT.
//line "go/state/push.re":1
//go:generate re2go -f $INPUT -o $OUTPUT
package main

import (
	"fmt"
	"os"
)

// Use a small buffer to cover the case when a lexeme doesn't fit.
// In real world use a larger buffer.
const BUFSIZE int = 10

type State struct {
	file  *os.File
	buf   []byte
	cur   int
	mar   int
	tok   int
	lim   int
	state int
}

const (
	lexEnd = iota
	lexReady
	lexWaitingForInput
	lexPacketBroken
	lexPacketTooBig
)

func fill(st *State) int {
	shift := st.tok
	used := st.lim - st.tok
	free := BUFSIZE - used

// Error: no space. In real life can reallocate a larger buffer.
	if free < 1 { return lexPacketTooBig }

// Shift buffer contents (discard already processed data).
	copy(st.buf[0:], st.buf[shift:shift+used])
	st.cur -= shift
	st.mar -= shift
	st.lim -= shift
	st.tok -= shift

// Fill free space at the end of buffer with new data.
	n, _ := st.file.Read(st.buf[st.lim:BUFSIZE])
	st.lim += n
	st.buf[st.lim] = 0 // append sentinel symbol

return lexReady
}

func lex(st *State, recv *int) int {
	var yych byte
	
//line "go/state/push.go":60
switch (st.state) {
default:
	goto yy0
case 0:
	if (st.lim <= st.cur) {
		goto yy8
	}
	goto yyFillLabel0
case 1:
	if (st.lim <= st.cur) {
		goto yy3
	}
	goto yyFillLabel1
case 2:
	if (st.lim <= st.cur) {
		goto yy7
	}
	goto yyFillLabel2
}
//line "go/state/push.re":56

loop:
	st.tok = st.cur
	
//line "go/state/push.go":85

yy0:
yyFillLabel0:
	yych = st.buf[st.cur]
	switch (yych) {
	case 'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z':
		goto yy4
	default:
		if (st.lim <= st.cur) {
			st.state = 0
			return lexWaitingForInput
		}
		goto yy2
	}
yy2:
	st.cur += 1
yy3:
	st.state = -1
//line "go/state/push.re":72
	{ return lexPacketBroken }
//line "go/state/push.go":106
yy4:
	st.cur += 1
	st.mar = st.cur
yyFillLabel1:
	yych = st.buf[st.cur]
	switch (yych) {
	case ';':
		goto yy5
	case 'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z':
		goto yy6
	default:
		if (st.lim <= st.cur) {
			st.state = 1
			return lexWaitingForInput
		}
		goto yy3
	}
yy5:
	st.cur += 1
	st.state = -1
//line "go/state/push.re":74
	{ *recv = *recv + 1; goto loop }
//line "go/state/push.go":129
yy6:
	st.cur += 1
yyFillLabel2:
	yych = st.buf[st.cur]
	switch (yych) {
	case ';':
		goto yy5
	case 'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z':
		goto yy6
	default:
		if (st.lim <= st.cur) {
			st.state = 2
			return lexWaitingForInput
		}
		goto yy7
	}
yy7:
	st.cur = st.mar
	goto yy3
yy8:
	st.state = -1
//line "go/state/push.re":73
	{ return lexEnd }
//line "go/state/push.go":153
//line "go/state/push.re":75

}

func test(expect int, packets []string) {
	// Create a "socket" (open the same file for reading and writing).
	fname := "pipe"
	fw, _ := os.Create(fname)
	fr, _ := os.Open(fname)

// Initialize lexer state: `state` value is -1, all offsets are at the end
	// of buffer.
	st := &State{
		file:  fr,
		// Sentinel at `lim` offset is set to zero, which triggers YYFILL.
		buf:   make([]byte, BUFSIZE+1),
		cur:   BUFSIZE,
		mar:   BUFSIZE,
		tok:   BUFSIZE,
		lim:   BUFSIZE,
		state: -1,
	}

// Main loop. The buffer contains incomplete data which appears packet by
	// packet. When the lexer needs more input it saves its internal state and
	// returns to the caller which should provide more input and resume lexing.
	var status int
	send := 0
	recv := 0
	for {
		status = lex(st, &recv)
		if status == lexEnd {
			break
		} else if status == lexWaitingForInput {
			if send < len(packets) {
				fw.WriteString(packets[send])
				send += 1
			}
			status = fill(st)
			if status != lexReady {
				break
			}
		} else if status == lexPacketBroken {
			break
		}
	}

// Check results.
	if status != expect || (status == lexEnd && recv != send) {
		panic(fmt.Sprintf("got %d, want %d", status, expect))
	}

// Cleanup: remove input file.
	fr.Close()
	fw.Close()
	os.Remove(fname)
}

func main() {
	test(lexEnd, []string{})
	test(lexEnd, []string{"zero;", "one;", "two;", "three;", "four;"})
	test(lexPacketBroken, []string{"??;"})
	test(lexPacketTooBig, []string{"looooooooooooong;"})
}