func rhsCase(l lexer.Lexer, tok string) (syms.SymbolID, error) {
if tok == "" {
return syms.ERROR, errors.New("empty rhs identifier")
}
symbols := l.GetSymbolSet()
sid, err := symbols.GetByName(tok)
if err == nil {
return sid, nil
}
lt := len(tok)
if isIdentName(tok) {
return l.Ident(tok[1 : lt-1]), nil
} else if isOperatorName(tok) {
return l.Operator(tok[1 : lt-1]), nil
}
if tok == "" || !tokenRe.MatchString(tok) {
return syms.ERROR, fmt.Errorf("%s is not a valid rhs identifier", tok)
}
sid, err = symbols.Add(tok, false)
return sid, err
}
