protected void keywordParam() throws ParseException {
if (!fInput.hasNext()) return;
if (fInput.next().getTyp() == TSExpression.SYMBOL) {
Symbol symbol = (Symbol) fInput.current();
if (symbol.getSymbolName().equalsIgnoreCase(TOKEN_KEY)) {
while (true) {
if (!fInput.hasNext()) {
break;
}
SExpression next = fInput.next();
if (isSpecialSymbol(next)) {
fInput.pushBack();
break;
}
addKey(varInit(next));
}
allowOtherKeys();
} else {
fInput.pushBack();
}
} else {
error("Unknown symbol in key list: &key expected", fInput.getInputSExpression());
}
}
protected void optionalParam() throws ParseException {
if (!fInput.hasNext()) return; // leere Lambda Liste
if (fInput.next().getTyp() == TSExpression.SYMBOL) {
Symbol symbol = (Symbol) fInput.current();
if (symbol.getSymbolName().equalsIgnoreCase(TOKEN_OPTIONAL)) {
// if(!fInput.hasNext()) { //&optional gesehen, aber kein weiteres symbol angegeben
// error("At least one &optional parameter must be specified",
// fInput.getInputSExpression());
// }
// addOptional(varInit(fInput.next())); //mindesten ein Symbol ist angegeben
while (true) {
if (!fInput.hasNext()) {
break;
}
SExpression next = fInput.next();
if (isSpecialSymbol(next)) {
fInput.pushBack();
break;
}
addOptional(varInit(next));
}
} else {
fInput.pushBack();
return;
}
} else {
error("Unknown symbol in optional parameter list: &optional expected", fInput.current());
}
}
protected void bodyOrRest() throws ParseException {
if (!fInput.hasNext()) return;
if (fInput.next().getTyp() == TSExpression.SYMBOL) {
Symbol symbol = (Symbol) fInput.current();
if (symbol.getSymbolName().equalsIgnoreCase(TOKEN_BODY)) {
fBody = readRestOrBodySymbol("body");
} else if (symbol.getSymbolName().equalsIgnoreCase(TOKEN_REST)) {
fRest = readRestOrBodySymbol("rest");
} else {
fInput.pushBack(); // evtl. &key
return;
}
} else {
error("Unknown symbol in rest or body list: &body or &rest expected", fInput.current());
}
}
protected boolean isSpecialSymbol(final SExpression sexp) {
if (sexp.getTyp() != TSExpression.SYMBOL) return false;
Symbol symbol = (Symbol) sexp;
String symName = symbol.getSymbolName();
return symName.equalsIgnoreCase(TOKEN_OPTIONAL)
|| symName.equalsIgnoreCase(TOKEN_BODY)
|| symName.equalsIgnoreCase(TOKEN_KEY)
|| symName.equalsIgnoreCase(TOKEN_REST)
|| symName.equals(TOKEN_AUX)
|| symName.equals(TOKEN_ALLOW_OTHER_KEYS)
|| symName.equals(TOKEN_WHOLE)
|| symName.equals(TOKEN_ENVIRONMENT);
}