com.khubla.jvmbasic.jvmbasicc.compiler.Dispatcher.java Source code

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Here is the source code for com.khubla.jvmbasic.jvmbasicc.compiler.Dispatcher.java

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package com.khubla.jvmbasic.jvmbasicc.compiler;

/*
 * jvmBasic Copyright 2012, khubla.com
 *
 *   This program is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
import org.antlr.v4.runtime.CommonToken;
import org.antlr.v4.runtime.ParserRuleContext;
import org.antlr.v4.runtime.tree.ParseTree;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.khubla.jvmbasic.jvmbasicc.antlr.jvmBasicParser;
import com.khubla.jvmbasic.jvmbasicc.function.Function;
import com.khubla.jvmbasic.jvmbasicc.function.FunctionRegistry;

/**
 * dispatcher
 */
public class Dispatcher {
    /**
     * logger
     */
    private static final Logger logger = LoggerFactory.getLogger(Dispatcher.class);

    /**
     * dispatch
     */
    public static boolean dispatch(GenerationContext generationContext) throws Exception {
        try {
            if (null != generationContext.getParseTree()) {
                final Object o = generationContext.getParseTree().getPayload();
                if (o.getClass() == CommonToken.class) {
                    final CommonToken commonToken = (CommonToken) o;
                    final Function function = FunctionRegistry.getInstance()
                            .getTokenFunction(commonToken.getType());
                    logger.info("Dispatching to '" + function.getClass().getSimpleName() + "' for token '"
                            + jvmBasicParser.tokenNames[commonToken.getType()] + "'");
                    return function.execute(generationContext);
                } else {
                    final ParserRuleContext parserRuleContext = (ParserRuleContext) o;
                    final Function function = FunctionRegistry.getInstance()
                            .getRuleFunction(parserRuleContext.getRuleIndex());
                    logger.info("Dispatching to '" + function.getClass().getSimpleName() + "' for rule '"
                            + jvmBasicParser.ruleNames[parserRuleContext.getRuleIndex()] + "'");
                    return function.execute(generationContext);
                }
            }
            return true;
        } catch (final Exception e) {
            throw new Exception("Exception in dispatch at line " + generationContext.getLineNumber(), e);
        }
    }

    /**
     * dispatch to all children of the current context
     */
    public static boolean dispatchChildren(GenerationContext generationContext) throws Exception {
        try {
            if (null != generationContext.getParseTree()) {
                for (int i = 0; i < generationContext.getParseTree().getChildCount(); i++) {
                    final ParseTree parseTree = generationContext.getParseTree().getChild(i);
                    final GenerationContext childGenerationContext = new GenerationContext(generationContext,
                            parseTree);
                    // final DefaultStatementProcessor defaultStatementProcessor = new DefaultStatementProcessor(childGenerationContext);
                    // final StatementsProcessor statementsProcessor = new StatementsProcessor(GenerationContext.getProgramStaticAnalysis());
                    // statementsProcessor.process(defaultStatementProcessor);
                    try {
                        Dispatcher.dispatch(childGenerationContext);
                    } catch (final Exception e) {
                        throw new Exception(
                                "Exception in dispatchChildren at line " + childGenerationContext.getLineNumber(),
                                e);
                    }
                }
            }
            return true;
        } catch (final Exception e) {
            throw new Exception("Exception in dispatchChildren", e);
        }
    }
}