| /********************************************************************* |
| * Copyright (c) 2008 The University of York. |
| * |
| * This program and the accompanying materials are made |
| * available under the terms of the Eclipse Public License 2.0 |
| * which is available at https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| **********************************************************************/ |
| package org.eclipse.epsilon.eol.dom; |
| |
| import org.eclipse.epsilon.common.module.IModule; |
| import org.eclipse.epsilon.common.parse.AST; |
| import org.eclipse.epsilon.eol.exceptions.EolIllegalReturnException; |
| import org.eclipse.epsilon.eol.exceptions.EolRuntimeException; |
| import org.eclipse.epsilon.eol.execute.ExecutorFactory; |
| import org.eclipse.epsilon.eol.execute.context.FrameStack; |
| import org.eclipse.epsilon.eol.execute.context.FrameType; |
| import org.eclipse.epsilon.eol.execute.context.IEolContext; |
| |
| public class IfStatement extends Statement { |
| |
| protected Expression conditionExpression; |
| protected StatementBlock thenStatementBlock; |
| protected StatementBlock elseStatementBlock; |
| |
| public IfStatement() {} |
| |
| public IfStatement(Expression conditionExpression, StatementBlock thenStatementBlock, StatementBlock elseStatementBlock) { |
| this.conditionExpression = conditionExpression; |
| this.thenStatementBlock = thenStatementBlock; |
| this.elseStatementBlock = elseStatementBlock; |
| } |
| |
| @Override |
| public void build(AST cst, IModule module) { |
| super.build(cst, module); |
| conditionExpression = (Expression) module.createAst(cst.getFirstChild(), this); |
| thenStatementBlock = toStatementBlock(module.createAst(cst.getSecondChild(), this)); |
| if (cst.getChildCount() == 3) elseStatementBlock = toStatementBlock(module.createAst(cst.getThirdChild(), this)); |
| } |
| |
| @Override |
| public Object execute(IEolContext context) throws EolRuntimeException { |
| FrameStack frameStack = context.getFrameStack(); |
| ExecutorFactory executorFactory = context.getExecutorFactory(); |
| |
| frameStack.enterLocal(FrameType.UNPROTECTED, this); |
| Object condition = executorFactory.execute(conditionExpression, context); |
| |
| if (!(condition instanceof Boolean)) throw new EolIllegalReturnException("Boolean", condition, conditionExpression, context); |
| |
| Object result = null; |
| |
| if ((boolean) condition) { |
| result = executorFactory.execute(thenStatementBlock, context); |
| } |
| else if (elseStatementBlock != null) { |
| result = executorFactory.execute(elseStatementBlock, context); |
| } |
| |
| frameStack.leaveLocal(this); |
| return result; |
| } |
| |
| public Expression getConditionExpression() { |
| return conditionExpression; |
| } |
| |
| public void setConditionExpression(Expression conditionExpression) { |
| this.conditionExpression = conditionExpression; |
| } |
| |
| public StatementBlock getThenStatementBlock() { |
| return thenStatementBlock; |
| } |
| |
| public void setThenStatementBlock(StatementBlock thenStatementBlock) { |
| this.thenStatementBlock = thenStatementBlock; |
| } |
| |
| public StatementBlock getElseStatementBlock() { |
| return elseStatementBlock; |
| } |
| |
| public void setElseStatementBlock(StatementBlock elseStatementBlock) { |
| this.elseStatementBlock = elseStatementBlock; |
| } |
| |
| public void accept(IEolVisitor visitor) { |
| visitor.visit(this); |
| } |
| } |