func lexShell(x *lexing.Lexer) *lexing.Token {
r := x.Rune()
if x.IsWhite(r) {
panic("incorrect token start")
}
switch r {
case '"':
return lexing.LexString(x, String, '"')
}
if isBareRune(r) {
return lexBare(x)
}
x.Errorf("illegal char %q", r)
x.Next()
return x.MakeToken(lexing.Illegal)
}
func lexBare(x *lexing.Lexer) *lexing.Token {
start := x.Rune()
if !isBareRune(start) {
panic("not starting with a bare rune")
}
for {
x.Next()
if !isBareRune(x.Rune()) {
break
}
}
return x.MakeToken(Bare)
}