src/main/java/org/apache/sling/scripting/sightly/impl/plugin/TestPlugin.java

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 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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
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package org.apache.sling.scripting.sightly.impl.plugin;

import org.apache.sling.scripting.sightly.compiler.commands.Conditional;
import org.apache.sling.scripting.sightly.compiler.commands.VariableBinding;
import org.apache.sling.scripting.sightly.impl.compiler.PushStream;
import org.apache.sling.scripting.sightly.compiler.expression.Expression;
import org.apache.sling.scripting.sightly.impl.compiler.frontend.CompilerContext;

/**
 * Implementation for the test plugin
 */
public class TestPlugin extends AbstractPlugin {

    public TestPlugin() {
        name = "test";
        priority = 1;
    }

    @Override
    public PluginInvoke invoke(final Expression expressionNode, final PluginCallInfo callInfo, final CompilerContext compilerContext) {

        return new DefaultPluginInvoke() {

            private boolean globalBinding;

            @Override
            public void beforeElement(PushStream stream, String tagName) {
                String variableName = decodeVariableName(callInfo);
                globalBinding = variableName != null;
                if (variableName == null) {
                    variableName = compilerContext.generateVariable("testVariable");
                }
                if (globalBinding) {
                    stream.write(new VariableBinding.Global(variableName, expressionNode.getRoot()));
                } else {
                    stream.write(new VariableBinding.Start(variableName, expressionNode.getRoot()));
                }
                stream.write(new Conditional.Start(variableName, true));
            }

            @Override
            public void afterElement(PushStream stream) {
                stream.write(Conditional.END);
                if (!globalBinding) {
                    stream.write(VariableBinding.END);
                }
            }
        };
    }


}