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Mini Shell
Mini Shell
// Code generated by re2c, DO NOT EDIT.
//line "go/eof/04_generic_api_sentinel.re":1
//go:generate re2go $INPUT -o $OUTPUT
package main
// Returns "fake" terminating null if cursor has reached limit.
func peek(str string, cur int) byte {
if cur >= len(str) {
return 0 // fake null
} else {
return str[cur]
}
}
// Expects a string without terminating null.
func lex(str string) int {
var cur int
count := 0
for {
//line "go/eof/04_generic_api_sentinel.go":22
{
var yych byte
yych = peek(str, cur)
switch (yych) {
case 0x00:
goto yy1
case ' ':
goto yy3
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 yy5
default:
goto yy2
}
yy1:
cur += 1
//line "go/eof/04_generic_api_sentinel.re":25
{ return count }
//line "go/eof/04_generic_api_sentinel.go":40
yy2:
cur += 1
//line "go/eof/04_generic_api_sentinel.re":24
{ return -1 }
//line "go/eof/04_generic_api_sentinel.go":45
yy3:
cur += 1
yych = peek(str, cur)
switch (yych) {
case ' ':
goto yy3
default:
goto yy4
}
yy4:
//line "go/eof/04_generic_api_sentinel.re":27
{ continue }
//line "go/eof/04_generic_api_sentinel.go":58
yy5:
cur += 1
yych = peek(str, 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 yy5
default:
goto yy6
}
yy6:
//line "go/eof/04_generic_api_sentinel.re":26
{ count += 1; continue }
//line "go/eof/04_generic_api_sentinel.go":71
}
//line "go/eof/04_generic_api_sentinel.re":28
}
}
func main() {
assert_eq := func(x, y int) { if x != y { panic("error") } }
assert_eq(lex(""), 0)
assert_eq(lex("one two three"), 3)
assert_eq(lex("f0ur"), -1)
}
Zerion Mini Shell 1.0