package com.creativewidgetworks.goldparser.simple3.rulehandlers;
import java.util.ArrayList;
import java.util.List;
import com.creativewidgetworks.goldparser.engine.ParserException;
import com.creativewidgetworks.goldparser.engine.Reduction;
import com.creativewidgetworks.goldparser.parser.ProcessRule;
import com.creativewidgetworks.goldparser.parser.Variable;
import com.creativewidgetworks.goldparser.parser.GOLDParser;
@ProcessRule(rule={
"<OptionalArgumentList> ::= <ArgumentList>",
"<OptionalArgumentList> ::= ",
"<ArgumentList> ::= <Expression> , <ArgumentList>",
"<ArgumentList> ::= <Expression>"
})
/**
* Rule handler for the pass arguments rule.
*
* @author Ralph Iden (http://www.creativewidgetworks.com)
* @version 5.0.0
*/
public class Arguments extends Reduction {
public Arguments(Reduction reduction) {
List<Reduction> arguments = new ArrayList<Reduction>();
arguments.add(reduction);
setValue(new Variable(arguments));
}
public Arguments(GOLDParser parser) throws ParserException {
Reduction reduction = parser.getCurrentReduction();
List<Reduction> arguments = new ArrayList<Reduction>();
buildArgumentList(reduction, arguments);
setValue(new Variable(arguments));
}
/**
* Helper to recursively expand any Argument objects to retrieve a
* list of Reductions
* @param reduction the reduction currently being processed
* @param args list of arguments
*/
private void buildArgumentList(Reduction reduction, List<Reduction> args) throws ParserException {
int tokenCount = reduction.size();
if (tokenCount > 0) {
for (int i = 0; i < tokenCount; i++) {
Object obj = reduction.get(i).getData();
if (obj instanceof Reduction) {
if (obj instanceof Arguments) {
buildArgumentList((Reduction)obj, args);
} else {
args.add((Reduction)obj);
}
}
}
} else if (reduction.getValue() != null) {
List<Reduction> moreArgs = (List<Reduction>) reduction.getValue().asObject();
for (Reduction r : moreArgs) {
args.add(r);
}
}
}
}