blob: f8df3f1ec9c9ef9c9b683d8b60b10e19eb21e36e (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
|
package parsec
import "fmt"
type Error struct {
pos int
Expected string
}
func (e Error) Pos() int { return e.pos }
func (e Error) Error() string { return fmt.Sprintf("offset %d: Expected %s", e.pos, e.Expected) }
type State struct {
Input string
Pos int
Error Error
}
func (s *State) Advance(i int) {
s.Pos += i
}
func (s *State) Get() string {
if s.Pos > len(s.Input) {
return ""
}
return s.Input[s.Pos:]
}
func (s *State) ErrorHere(expected string) {
s.Error.pos = s.Pos
s.Error.Expected = expected
}
func (s *State) ClearError() {
s.Error.Expected = ""
}
func (s *State) Errored() bool {
return s.Error.Expected != ""
}
func InputString(input string) *State {
return &State{Input: input}
}
|
