| /******************************************************************************* |
| * 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 |
| * under the License. |
| ******************************************************************************/ |
| package org.apache.sling.scripting.sightly.impl.plugin; |
| |
| import org.apache.sling.scripting.sightly.compiler.commands.Command; |
| import org.apache.sling.scripting.sightly.compiler.commands.Conditional; |
| import org.apache.sling.scripting.sightly.impl.compiler.Patterns; |
| 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.compiler.expression.ExpressionNode; |
| import org.apache.sling.scripting.sightly.compiler.expression.nodes.BooleanConstant; |
| import org.apache.sling.scripting.sightly.compiler.expression.nodes.StringConstant; |
| import org.apache.sling.scripting.sightly.impl.compiler.frontend.CompilerContext; |
| |
| /** |
| * The unwrapped plugin |
| */ |
| public class UnwrapPlugin extends AbstractPlugin { |
| |
| public UnwrapPlugin() { |
| name = "unwrap"; |
| priority = 125; |
| } |
| |
| @Override |
| public PluginInvoke invoke(final Expression expression, PluginCallInfo callInfo, final CompilerContext compilerContext) { |
| return new DefaultPluginInvoke() { |
| |
| private final String variable = compilerContext.generateVariable("unwrapCondition"); |
| private final Command unwrapTest = new Conditional.Start(variable, false); |
| private boolean isSlyTag = false; |
| |
| @Override |
| public void beforeElement(PushStream stream, String tagName) { |
| isSlyTag = "sly".equals(tagName.toLowerCase()); |
| stream.write(new VariableBinding.Start(variable, testNode())); |
| } |
| |
| @Override |
| public void beforeTagOpen(PushStream stream) { |
| if (isSlyTag) { |
| Patterns.endStreamIgnore(stream); |
| } |
| stream.write(unwrapTest); |
| } |
| |
| @Override |
| public void afterTagOpen(PushStream stream) { |
| stream.write(Conditional.END); |
| if (isSlyTag) { |
| Patterns.beginStreamIgnore(stream); |
| } |
| } |
| |
| @Override |
| public void beforeTagClose(PushStream stream, boolean isSelfClosing) { |
| if (isSlyTag) { |
| Patterns.endStreamIgnore(stream); |
| } |
| stream.write(unwrapTest); |
| } |
| |
| @Override |
| public void afterTagClose(PushStream stream, boolean isSelfClosing) { |
| stream.write(Conditional.END); |
| if (isSlyTag) { |
| Patterns.beginStreamIgnore(stream); |
| } |
| } |
| |
| @Override |
| public void afterElement(PushStream stream) { |
| stream.write(VariableBinding.END); |
| } |
| |
| private ExpressionNode testNode() { |
| return (isEmptyExpression(expression.getRoot())) ? BooleanConstant.TRUE : expression.getRoot(); |
| } |
| |
| private boolean isEmptyExpression(ExpressionNode node) { |
| return node instanceof StringConstant && ((StringConstant) node).getText().isEmpty(); |
| } |
| }; |
| } |
| } |