package com.creativewidgetworks.goldparser.simple2.rulehandlers;
import com.creativewidgetworks.goldparser.engine.ParserException;
import com.creativewidgetworks.goldparser.engine.Reduction;
import com.creativewidgetworks.goldparser.parser.GOLDParser;
import com.creativewidgetworks.goldparser.parser.ProcessRule;
import com.creativewidgetworks.goldparser.simple2.Simple2;
@ProcessRule(rule={
"<Statement> ::= assign Id '=' <Expression>"
})
/**
* Rule handler for the assignment rule.
*
* @author Ralph Iden (http://www.creativewidgetworks.com)
* @version 5.0.0
*/
public class Assign extends Reduction {
private GOLDParser theParser;
private String variableName;
private Reduction variableValue;
public Assign(GOLDParser parser) {
theParser = parser;
Reduction reduction = parser.getCurrentReduction();
if (reduction != null) {
if (reduction.size() == 4) {
variableName = reduction.get(1).asString();
variableValue = reduction.get(3).asReduction();
} else {
parser.raiseParserException(Simple2.formatMessage("error.param_count", "4", String.valueOf(reduction.size())));
}
} else {
parser.raiseParserException(Simple2.formatMessage("error.no_reduction"));
}
}
@Override
public void execute() throws ParserException {
theParser.setProgramVariable(variableName, variableValue.getValue());
}
}