Package org.parboiled.matchers

Source Code of org.parboiled.matchers.VarFramingMatcher

/*
* Copyright (C) 2009-2010 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.matchervisitors.MatcherVisitor;
import org.parboiled.support.Var;

import java.util.List;

/**
* Special wrapping matcher that manages the creation and destruction of execution frames for a number of action vars.
*/
public class VarFramingMatcher implements Matcher {

    private final Matcher inner;
    private final Var[] variables;

    public VarFramingMatcher(@NotNull Rule inner, @NotNull Var[] variables) {
        this.inner = (Matcher) inner;
        this.variables = variables;
    }

    public <V> boolean match(@NotNull MatcherContext<V> context) {
        for (Var var : variables) {
            var.enterFrame();
        }

        boolean matched = inner.match(context);

        for (Var var : variables) {
            var.exitFrame();
        }

        return matched;
    }

    // GraphNode
    @NotNull
    public List<Matcher> getChildren() {
        return inner.getChildren();
    }

    // Rule
    public Rule label(String label) {
        return new VarFramingMatcher(inner.label(label), variables);
    }

    public Rule suppressNode() {
        return new VarFramingMatcher(inner.suppressNode(), variables);
    }

    public Rule suppressSubnodes() {
        return new VarFramingMatcher(inner.suppressSubnodes(), variables);
    }

    public Rule skipNode() {
        return new VarFramingMatcher(inner.skipNode(), variables);
    }

    public Rule memoMismatches() {
        return new VarFramingMatcher(inner.memoMismatches(), variables);
    }

    // Matcher
    public String getLabel() {return inner.getLabel();}

    public boolean isNodeSuppressed() {return inner.isNodeSuppressed();}

    public boolean areSubnodesSuppressed() {return inner.areSubnodesSuppressed();}

    public boolean isNodeSkipped() {return inner.isNodeSkipped();}

    public boolean areMismatchesMemoed() { return inner.areMismatchesMemoed(); }

    public void setTag(Object tagObject) { inner.setTag(tagObject); }

    public Object getTag() { return inner.getTag(); }
   
    public MatcherContext getSubContext(MatcherContext context) {
        MatcherContext subContext = inner.getSubContext(context);
        subContext.setMatcher(this); // we need to inject ourselves here otherwise we get cut out
        return subContext;
    }

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

    @Override
    public String toString() { return inner.toString(); }

    /**
     * Retrieves the innermost Matcher that is not a VarFramingMatcher.
     *
     * @param matcher the matcher to unwrap
     * @return the given instance if it is not a VarFramingMatcher, otherwise the innermost Matcher
     */
    public static  Matcher unwrap(Matcher matcher) {
        if (matcher instanceof VarFramingMatcher) {
            VarFramingMatcher varFramingMatcher = (VarFramingMatcher) matcher;
            return unwrap(varFramingMatcher.inner);
        }
        return matcher;
    }

}
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