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/**
 * vertigo - simple java starter
 *
 * Copyright (C) 2013, KleeGroup, [email protected] (http://www.kleegroup.com)
 * KleeGroup, Centre d'affaire la Boursidiere - BP 159 - 92357 Le Plessis Robinson Cedex - France
 *
 * 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 io.vertigo.commons.parser;

import io.vertigo.lang.Assertion;

import java.util.ArrayList;
import java.util.List;

/**
 * @author pchretien
 */
final class ManyRuleParser implements Parser> {
	private final ManyRule manyRule;
	private List results;

	ManyRuleParser(final ManyRule manyRule) {
		Assertion.checkNotNull(manyRule);
		//-----
		this.manyRule = manyRule;
	}

	/** {@inheritDoc} */
	@Override
	public int parse(final String text, final int start) throws NotFoundException {
		int index = start;
		//-----
		results = new ArrayList<>();
		NotFoundException best = null;
		try {
			int prevIndex = -1;
			while (index < text.length() && index > prevIndex) {
				prevIndex = index;
				final Parser parser = manyRule.getRule().createParser();
				index = parser.parse(text, index);
				if (index > prevIndex) {
					//celé signifie que l"index n a pas avancé, on sort
					results.add(parser.get());
				}
			}
		} catch (final NotFoundException e) {
			best = e;
			if (best.getIndex() > index) { //Si on a plus avancé avec une autre règle c'est que celle ci n'avance pas assez (typiquement une WhiteSpace seule, ou une OptionRule)
				throw best;
			}
		}
		if (!manyRule.isEmptyAccepted() && results.isEmpty()) {
			throw new NotFoundException(text, start, best, "Aucun élément de la liste trouvé : {0}", manyRule.getExpression());
		}
		if (manyRule.isRepeat() && text.length() > index) {
			throw new NotFoundException(text, start, best, "{0} élément(s) trouvé(s), éléments suivants non parsés selon la règle :{1}", results.size(), manyRule.getExpression());
		}
		return index;
	}

	@Override
	public List get() {
		return results;
	}
}