| /******************************************************************************* |
| * Copyright (c) 2009, 2019 Xored Software Inc and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-v20.html |
| * |
| * Contributors: |
| * Xored Software Inc - initial API and implementation and/or initial documentation |
| *******************************************************************************/ |
| package org.eclipse.rcptt.ecl.internal.core; |
| |
| import static org.eclipse.rcptt.ecl.runtime.BoxedValues.box; |
| |
| import org.eclipse.core.runtime.CoreException; |
| import org.eclipse.core.runtime.IStatus; |
| import org.eclipse.core.runtime.Status; |
| import org.eclipse.rcptt.ecl.core.Command; |
| import org.eclipse.rcptt.ecl.core.Declaration; |
| import org.eclipse.rcptt.ecl.core.Let; |
| import org.eclipse.rcptt.ecl.core.Val; |
| import org.eclipse.rcptt.ecl.runtime.ICommandService; |
| import org.eclipse.rcptt.ecl.runtime.IProcess; |
| import org.eclipse.rcptt.ecl.runtime.ISession; |
| |
| public class LetService implements ICommandService { |
| public IStatus service(Command command, IProcess context) |
| throws InterruptedException, CoreException { |
| if (!(command instanceof Let)) { |
| return Status.CANCEL_STATUS; |
| } |
| |
| Let let = (Let) command; |
| DeclarationContainer locals = getLocals(context); |
| |
| boolean inputUsed = false; |
| for (Declaration decl : let.getVals()) { |
| if (!(decl instanceof Val)) { |
| continue; // TODO other declarations support |
| } |
| Val val = (Val) decl; |
| if (val.isInput()) { |
| inputUsed = true; |
| val.setValue(box(context.getInput().take(Long.MAX_VALUE))); |
| } |
| |
| locals.declare(val.getName(), val); |
| } |
| |
| return context |
| .getSession() |
| .execute(let.getBody(), inputUsed ? null : context.getInput(), |
| context.getOutput()).waitFor(); |
| } |
| |
| protected static DeclarationContainer getLocals(IProcess context) { |
| ISession session = context.getSession(); |
| if (!(session instanceof CommandSession)) { |
| return null; |
| } |
| |
| return ((CommandSession) session).getStack().getDeclarations(); |
| } |
| } |