| /******************************************************************************* |
| * 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.optimization; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.apache.sling.scripting.sightly.compiler.commands.AbstractCommandVisitor; |
| import org.apache.sling.scripting.sightly.compiler.commands.OutputVariable; |
| import org.apache.sling.scripting.sightly.compiler.expression.ExpressionNode; |
| import org.apache.sling.scripting.sightly.compiler.commands.Command; |
| import org.apache.sling.scripting.sightly.compiler.commands.Conditional; |
| import org.apache.sling.scripting.sightly.compiler.commands.Loop; |
| import org.apache.sling.scripting.sightly.compiler.commands.Procedure; |
| import org.apache.sling.scripting.sightly.compiler.commands.VariableBinding; |
| |
| /** |
| * Extracts the variables used in a command |
| */ |
| public class CommandVariableUsage extends AbstractCommandVisitor { |
| |
| private ArrayList<String> variables = new ArrayList<>(); |
| |
| public static List<String> extractVariables(Command command) { |
| CommandVariableUsage cvu = new CommandVariableUsage(); |
| command.accept(cvu); |
| return cvu.variables; |
| } |
| |
| @Override |
| public void visit(Conditional.Start conditionalStart) { |
| variables.add(conditionalStart.getVariable()); |
| } |
| |
| @Override |
| public void visit(VariableBinding.Start variableBindingStart) { |
| addFromExpression(variableBindingStart.getExpression()); |
| } |
| |
| @Override |
| public void visit(VariableBinding.Global globalAssignment) { |
| addFromExpression(globalAssignment.getExpression()); |
| } |
| |
| private void addFromExpression(ExpressionNode node) { |
| variables.addAll(VariableFinder.findVariables(node)); |
| } |
| |
| @Override |
| public void visit(OutputVariable outputVariable) { |
| variables.add(outputVariable.getVariableName()); |
| } |
| |
| @Override |
| public void visit(Loop.Start loopStart) { |
| variables.add(loopStart.getListVariable()); |
| } |
| |
| @Override |
| public void visit(Procedure.Call procedureCall) { |
| variables.add(procedureCall.getTemplateVariable()); |
| variables.add(procedureCall.getArgumentsVariable()); |
| } |
| } |