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package goparsify
import (
"fmt"
"strings"
"unicode/utf8"
)
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
WSChars string
NoAutoWS bool
}
func (s *State) Advance(i int) {
s.Pos += i
}
// AutoWS consumes all whitespace
func (s *State) AutoWS() {
if s.NoAutoWS {
return
}
s.WS()
}
func (s *State) WS() {
for s.Pos < len(s.Input) {
r, w := utf8.DecodeRuneInString(s.Input[s.Pos:])
if !strings.ContainsRune(s.WSChars, r) {
return
}
s.Pos += w
}
}
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, WSChars: "\t\n\v\f\r \x85\xA0"}
}
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