Package org.parboiled.matchers

Source Code of org.parboiled.matchers.OneOrMoreMatcher

/*
* Copyright (C) 2009 Mathias Doenitz
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

package org.parboiled.matchers;

import org.jetbrains.annotations.NotNull;
import org.parboiled.MatcherContext;
import org.parboiled.Rule;
import org.parboiled.errors.GrammarException;
import org.parboiled.matchervisitors.MatcherVisitor;

/**
* A {@link Matcher} that repeatedly tries its submatcher against the input.
* Succeeds if its submatcher succeeds at least once.
*/
public class OneOrMoreMatcher extends AbstractMatcher {

    public final Matcher subMatcher;

    public OneOrMoreMatcher(@NotNull Rule subRule) {
        super(subRule);
        this.subMatcher = getChildren().get(0);
    }

    public boolean match(@NotNull MatcherContext context) {
        boolean matched = subMatcher.getSubContext(context).runMatcher();
        if (!matched) return false;

        // collect all further matches as well
        int lastIndex = context.getCurrentIndex();
        while (subMatcher.getSubContext(context).runMatcher()) {
            int currentIndex = context.getCurrentIndex();
            if (currentIndex == lastIndex) {
                throw new GrammarException("The inner rule of OneOrMore rule '%s' must not allow empty matches",
                        context.getPath());
            }
            lastIndex = currentIndex;
        }

        context.createNode();
        return true;
    }

    public <R> R accept(@NotNull MatcherVisitor<R> visitor) {
        return visitor.visit(this);
    }
}
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