BackendTestHelper.java

/*
Copyright (c) 2008 Arno Haase, Andr� Arnold.
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
http://www.eclipse.org/legal/epl-v10.html

Contributors:
    Arno Haase - initial API and implementation
    Andr� Arnold
 */
package org.eclipse.xtend.backend.testhelpers;

import org.eclipse.xtend.backend.BackendFacade;
import org.eclipse.xtend.backend.common.BackendTypesystem;
import org.eclipse.xtend.backend.common.ExecutionContext;
import org.eclipse.xtend.backend.common.ExpressionBase;
import org.eclipse.xtend.backend.common.SourcePos;
import org.eclipse.xtend.backend.expr.LiteralExpression;
import org.eclipse.xtend.backend.expr.LocalVarEvalExpression;
import org.eclipse.xtend.backend.functions.FunctionDefContextInternal;
import org.eclipse.xtend.backend.types.CompositeTypesystem;
import org.eclipse.xtend.middleend.MiddleEndFactory;
import org.eclipse.xtend.middleend.javaannotations.JavaFunctionClassContributor;


/**
 * 
 * @author Arno Haase (http://www.haase-consulting.com)
 * @author Andr� Arnold
 */
public class BackendTestHelper {
    public static final SourcePos SOURCE_POS = createSourcePos();
    
    /**
     * This method returns an ExecutionContext that is basically empty - no registered functions, and
     *  only the JavaBeansTypeSystem. It is useful for simple tests.
     */
    public static ExecutionContext createEmptyExecutionContext () {
        final BackendTypesystem ts = new CompositeTypesystem ();
        return BackendFacade.createExecutionContext (createEmptyFdc (ts), ts, true);
    }

    public static FunctionDefContextInternal createEmptyFdc (BackendTypesystem ts) {
        return (FunctionDefContextInternal) MiddleEndFactory.create (ts, null).getFunctions ("java/lang/Object");
    }
    
    public static FunctionDefContextInternal createFdc (BackendTypesystem ts, Class<?> contributingClass) {
        return (FunctionDefContextInternal) MiddleEndFactory.create (ts, null).getFunctions (JavaFunctionClassContributor.classAsResource (contributingClass));
    }
    
    public static ExpressionBase createLiteral (Object literal) {
        return new LiteralExpression (literal, SOURCE_POS);
    }
    
    public static ExpressionBase createLocalVar (String name) {
    	return new LocalVarEvalExpression(name, SOURCE_POS);
    }
    
    public static SourcePos createSourcePos () {
        return new SourcePos ("<no file>", "<no callable>", 0);
    }
}