org.eclipse.xtext.parsetree.reconstr.impl.DefaultHiddenTokenHelper.java Source code

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Here is the source code for org.eclipse.xtext.parsetree.reconstr.impl.DefaultHiddenTokenHelper.java

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/*******************************************************************************
 * Copyright (c) 2010 itemis AG (http://www.itemis.eu) and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *******************************************************************************/
package org.eclipse.xtext.parsetree.reconstr.impl;

import org.eclipse.xtext.AbstractRule;
import org.eclipse.xtext.ParserRule;
import org.eclipse.xtext.xtext.RuleNames;

import com.google.common.collect.Iterables;
import com.google.inject.Inject;

/**
 * @author Moritz Eysholdt - Initial contribution and API
 */
public class DefaultHiddenTokenHelper extends AbstractHiddenTokenHelper {

    private AbstractRule wsRule;

    @Override
    public boolean isWhitespace(AbstractRule rule) {
        return rule != null && "WS".equals(rule.getName());
    }

    @Override
    public boolean isComment(AbstractRule rule) {
        return rule != null && ("ML_COMMENT".equals(rule.getName()) || "SL_COMMENT".equals(rule.getName()));
    }

    @Override
    public AbstractRule getWhitespaceRuleFor(String whitespace) {
        return wsRule;
    }

    @Override
    public AbstractRule getWhitespaceRuleFor(ParserRule context, String whitespace) {
        if (context == null || !context.isDefinesHiddenTokens())
            return wsRule;
        if (context.getHiddenTokens().contains(wsRule))
            return wsRule;
        return null;
    }

    @Inject
    private void setGrammar(RuleNames names) {
        wsRule = Iterables.getFirst(names.getRulesBySimpleName("WS"), null);
    }

}