func (s *Scanner) scanIdentifier() (string, token.Token, token.Pos) {
start := s.offset
var str string
for unicode.IsLetter(s.ch) || unicode.IsDigit(s.ch) {
str += string(s.ch)
s.next()
}
return str, token.Lookup(str), s.file.Pos(start)
}
func (s *Scanner) scanIdentifier() (string, token.Token, token.Pos) {
start := s.offset
for unicode.IsLetter(s.ch) || unicode.IsDigit(s.ch) {
s.next()
}
offset := s.offset
if s.ch == rune(0) {
offset++
}
lit := s.src[start:offset]
return lit, token.Lookup(lit), s.file.Pos(start)
}
func TestLookup(t *testing.T) {
var tests = []struct {
str string
tok token.Token
}{
{"+", token.ADD},
{"%", token.REM},
{"EOF", token.EOF},
{"Integer", token.INTEGER},
{"", token.IDENT},
}
for i, v := range tests {
if res := token.Lookup(v.str); res != v.tok {
t.Fatal(i, "- Expected:", v.tok, "Got:", res)
}
}
}