com.creativewidgetworks.goldparser.simple3.rulehandlers.Statements Maven / Gradle / Ivy

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Java implementation of Devin Cook's GOLD Parser engine

There is a newer version: 5.0.5

package com.creativewidgetworks.goldparser.simple3.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.simple3.Simple3;

@ProcessRule(rule={
    " ::=  ",    
    " ::= ",
    " ::= ",
    " ::= begin  end"
})

/**
 * Rule handler for the statement(s) rules.
 *
 * @author Ralph Iden (http://www.creativewidgetworks.com)
 * @version 5.0.0 
 */
public class Statements extends Reduction {
    private Reduction statement1;
    private Reduction statement2;

    public Statements(GOLDParser parser) {
        Reduction reduction = parser.getCurrentReduction();
        if (reduction != null) {
            if (reduction.size() > 0 && reduction.size() < 3) {
                statement1 = reduction.get(0).asReduction();
                statement2 = (reduction.size() > 1) ? reduction.get(1).asReduction() : null;
            } else {
                parser.raiseParserException(Simple3.formatMessage("error.param_count_range", "1", "2", String.valueOf(reduction.size())));
            }
        } else {
            parser.raiseParserException(Simple3.formatMessage("error.no_reduction"));
        }         
    }

    @Override
    public void execute() throws ParserException {
        statement1.execute();
        setValue(statement1.getValue());
        if (statement2 != null) {
            statement2.execute();
            setValue(statement2.getValue());
        }
    }

}