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Write parsers in pure Java

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/*
 * Copyright (C) 2009-2011 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 com.github.fge.grappa.transform.process;

import com.github.fge.grappa.transform.base.ParserClassNode;
import com.github.fge.grappa.transform.base.RuleMethod;

import javax.annotation.Nonnull;

/**
 * An individual processor for altering a generated {@link RuleMethod}
 *
 * All processors defined make use of ASM to manipulate the byte code of
 * generated methods. A given processor may, or may not, apply to a given rule.
 * This depends on what annotations are used on the rule, whether it takes
 * arguments, etc etc.
 */
public interface RuleMethodProcessor
{

    boolean appliesTo(@Nonnull ParserClassNode classNode,
        @Nonnull RuleMethod method);

    // TODO: replace Exception with a better one (should it inherit Runtime)
    void process(@Nonnull ParserClassNode classNode,
        @Nonnull RuleMethod method)
        throws Exception;
}