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/**
 * vertigo - simple java starter
 *
 * Copyright (C) 2013-2016, 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.dynamox.search.dsl.rules;

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

import io.vertigo.commons.peg.AbstractRule;
import io.vertigo.commons.peg.PegRule;
import io.vertigo.commons.peg.PegRules;
import io.vertigo.dynamox.search.dsl.model.DslField;
import io.vertigo.dynamox.search.dsl.model.DslMultiField;

/**
 * Parsing rule for query.
 * //(preMultiField)[(fields)+,](postMultiField)
 * @author npiedeloup
 */
final class DslMultiFieldRule extends AbstractRule> {
	DslMultiFieldRule() {
		super(createMainRule());
	}

	private static PegRule> createMainRule() {
		final PegRule>> otherFieldsRule = PegRules.zeroOrMore(
				PegRules.sequence(
						DslSyntaxRules.SPACES,
						DslSyntaxRules.ARRAY_SEPARATOR,
						DslSyntaxRules.SPACES,
						new DslFieldRule() //3
		), false);

		return PegRules.sequence(
				DslSyntaxRules.ARRAY_START,
				DslSyntaxRules.SPACES,
				new DslFieldRule(), //2
				otherFieldsRule, //3
				DslSyntaxRules.SPACES,
				DslSyntaxRules.ARRAY_END);
	}

	/** {@inheritDoc} */
	@Override
	protected DslMultiField handle(final List