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/**
 * Arara, the cool TeX automation tool
 * Copyright (c) 2012 -- 2018, Paulo Roberto Massa Cereda 
 * All rights reserved.
 *
 * Redistribution and  use in source  and binary forms, with  or without
 * modification, are  permitted provided  that the  following conditions
 * are met:
 *
 * 1. Redistributions  of source  code must  retain the  above copyright
 * notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form  must reproduce the above copyright
 * notice, this list  of conditions and the following  disclaimer in the
 * documentation and/or other materials provided with the distribution.
 *
 * 3. Neither  the name  of the  project's author nor  the names  of its
 * contributors may be used to  endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS  PROVIDED BY THE COPYRIGHT  HOLDERS AND CONTRIBUTORS
 * "AS IS"  AND ANY  EXPRESS OR IMPLIED  WARRANTIES, INCLUDING,  BUT NOT
 * LIMITED  TO, THE  IMPLIED WARRANTIES  OF MERCHANTABILITY  AND FITNESS
 * FOR  A PARTICULAR  PURPOSE  ARE  DISCLAIMED. IN  NO  EVENT SHALL  THE
 * COPYRIGHT HOLDER OR CONTRIBUTORS BE  LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY,  OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT  NOT LIMITED  TO, PROCUREMENT  OF SUBSTITUTE  GOODS OR  SERVICES;
 * LOSS  OF USE,  DATA, OR  PROFITS; OR  BUSINESS INTERRUPTION)  HOWEVER
 * CAUSED AND  ON ANY THEORY  OF LIABILITY, WHETHER IN  CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
 * WAY  OUT  OF  THE USE  OF  THIS  SOFTWARE,  EVEN  IF ADVISED  OF  THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
package com.github.cereda.arara.utils;

import org.yaml.snakeyaml.nodes.Tag;
import org.yaml.snakeyaml.resolver.Resolver;

/**
 * This class implements a directive resolver.
 * @author Paulo Roberto Massa Cereda
 * @version 4.0
 * @since 4.0
 */
public class DirectiveResolver extends Resolver {

    /**
     * Adds implicit resolvers to the YAML model. For arara, I disabled
     * boolean and numeric values to be automatically parsed. They still can
     * be used through an explicit conversion in the rule context.
     */
    @Override
    protected void addImplicitResolvers() {
        addImplicitResolver(Tag.MERGE, MERGE, "<");
        addImplicitResolver(Tag.NULL, NULL, "~nN\0");
        addImplicitResolver(Tag.NULL, EMPTY, null);
    }

}