| /******************************************************************************* |
| * 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.compiler.visitor; |
| |
| import org.apache.sling.scripting.sightly.compiler.commands.Command; |
| import org.apache.sling.scripting.sightly.compiler.commands.Loop; |
| import org.apache.sling.scripting.sightly.compiler.commands.VariableBinding; |
| import org.apache.sling.scripting.sightly.compiler.util.VariableTracker; |
| |
| /** |
| * Command visitor which tracks variables in commands. |
| */ |
| public abstract class TrackingVisitor<T> extends UniformVisitor { |
| |
| protected final VariableTracker<T> tracker = new VariableTracker<>(); |
| |
| @Override |
| public void visit(VariableBinding.Start variableBindingStart) { |
| super.visit(variableBindingStart); |
| tracker.pushVariable(variableBindingStart.getVariableName(), assignDefault(variableBindingStart)); |
| } |
| |
| @Override |
| public void visit(VariableBinding.End variableBindingEnd) { |
| super.visit(variableBindingEnd); |
| tracker.popVariable(); |
| } |
| |
| @Override |
| public void visit(Loop.Start loopStart) { |
| super.visit(loopStart); |
| tracker.pushVariable(loopStart.getIndexVariable(), assignDefault(loopStart)); |
| tracker.pushVariable(loopStart.getItemVariable(), assignDefault(loopStart)); |
| tracker.pushVariable(loopStart.getBeginVariable(), assignDefault(loopStart)); |
| tracker.pushVariable(loopStart.getStepVariable(), assignDefault(loopStart)); |
| tracker.pushVariable(loopStart.getEndVariable(), assignDefault(loopStart)); |
| } |
| |
| @Override |
| public void visit(Loop.End loopEnd) { |
| super.visit(loopEnd); |
| tracker.popVariable(); |
| tracker.popVariable(); |
| } |
| |
| protected abstract T assignDefault(Command command); |
| } |