Examples of org.codehaus.groovy.ast.expr.Expression

org.codehaus.groovy.ast.expr.Expression
Represents a base class for expressions which evaluate as an object @author James Strachan @version $Revision: 17114 $

    }
    
    protected void evaluateBinaryExpression(String message, BinaryExpression binExp) {
        CompileStack compileStack = controller.getCompileStack();


        Expression receiver = binExp.getLeftExpression();
        Expression arguments = binExp.getRightExpression();


        // ensure VariableArguments are read, not stored
        compileStack.pushLHS(false);
        controller.getCallSiteWriter().makeInvocation(receiver, message, arguments);
        compileStack.popLHS();

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        controller.getCallSiteWriter().makeInvocation(receiver, message, arguments);
        compileStack.popLHS();        
    }


    protected void evaluateBinaryExpressionWithAssignment(String method, BinaryExpression expression) {
        Expression leftExpression = expression.getLeftExpression();
        MethodVisitor mv  = controller.getMethodVisitor();
        AsmClassGenerator acg = controller.getAcg();
        OperandStack operandStack = controller.getOperandStack();
        CompileStack compileStack = controller.getCompileStack();
        
        if (leftExpression instanceof BinaryExpression) {
            BinaryExpression leftBinExpr = (BinaryExpression) leftExpression;
            if (leftBinExpr.getOperation().getType() == Types.LEFT_SQUARE_BRACKET) {
                // e.g. x[a] += b
                // -> subscript=a, x[subscript], =, x[subscript] + b
                // -> subscript=a, methodCall_3(x, "putAt", [subscript, methodCall_2(methodCall_1(x, "getAt", [subscript]), "plus", b)])
                
                Expression subscriptExpression = leftBinExpr.getRightExpression(); 
                subscriptExpression.visit(acg); // value(subscript)
                operandStack.box();
                int subscriptValueId = compileStack.defineTemporaryVariable("$subscript", ClassHelper.OBJECT_TYPE, true);


                // method calls from outer to inner (most inner will be called first):
                controller.getCallSiteWriter().prepareCallSite("putAt");

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    private void evaluateInstanceof(BinaryExpression expression) {
        OperandStack operandStack = controller.getOperandStack();
        
        expression.getLeftExpression().visit(controller.getAcg());
        operandStack.box();
        Expression rightExp = expression.getRightExpression();
        ClassNode classType;
        if (rightExp instanceof ClassExpression) {
            ClassExpression classExp = (ClassExpression) rightExp;
            classType = classExp.getType();
        } else {

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        if (expression instanceof BinaryExpression) {
            BinaryExpression be = (BinaryExpression) expression;
            if (be.getOperation().getType()==Types.LEFT_SQUARE_BRACKET) {
                // right expression is the subscript expression
                // we store the result of the subscription on the stack
                Expression subscript = be.getRightExpression();
                subscript.visit(controller.getAcg());
                operandStack.box(); //TODO: maybe not box here anymore, but need subscript type then
                int id = controller.getCompileStack().defineTemporaryVariable("$subscript", true);
                VariableSlotLoader subscriptExpression = new VariableSlotLoader(id,operandStack);
                // do modified visit
                BinaryExpression newBe = new BinaryExpression(be.getLeftExpression(), be.getOperation(), subscriptExpression);

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        final OperandStack operandStack = controller.getOperandStack();
        // at this point the receiver will be already on the stack.
        // in a[1]++ the method will be "++" aka "next" and the receiver a[1]
        
        ClassNode BEType = BinaryExpressionMultiTypeDispatcher.getType(expression,controller.getClassNode());
        Expression callSiteReceiverSwap = new BytecodeExpression(BEType) {
            @Override
            public void visit(MethodVisitor mv) {
                // CallSite is normally not showing up on the 
                // operandStack, so we place a dummy here with same
                // slot length.

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        if (expression instanceof VariableExpression) {
            VariableExpression ve = (VariableExpression) expression;
            v = ve.getAccessedVariable();
        } else {
            PropertyExpression propExp = ((PropertyExpression) expression);
            Expression objectExpression = propExp.getObjectExpression();
            if (objectExpression instanceof VariableExpression) {
                VariableExpression varExp = (VariableExpression) objectExpression;
                if (varExp.isThisExpression()) {
                    v = currentClass.getDeclaredField(propExp.getPropertyAsString());
                }

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        super.visitCatchStatement(cs);
    }


    public void visitMethodCallExpression(MethodCallExpression mce) {
        super.visitMethodCallExpression(mce);
        Expression aexp = mce.getArguments();
        if (aexp instanceof TupleExpression) {
            TupleExpression arguments = (TupleExpression) aexp;
            for (Expression e : arguments.getExpressions()) {
                checkForInvalidDeclaration(e);
            }

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    public static BooleanExpression isZeroExpr(Expression expr) {
        return new BooleanExpression(new BinaryExpression(expr, COMPARE_EQUAL, new ConstantExpression(0)));
    }


    private static BooleanExpression notEqualsFieldExpr(FieldNode fNode, Expression other) {
        final Expression fieldExpr = new VariableExpression(fNode);
        final Expression otherExpr = new PropertyExpression(other, fNode.getName());
        return new BooleanExpression(new BinaryExpression(fieldExpr, COMPARE_NOT_EQUAL, otherExpr));
    }

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        return new BooleanExpression(new BinaryExpression(fieldExpr, COMPARE_NOT_EQUAL, otherExpr));
    }


    private static BooleanExpression notEqualsPropertyExpr(PropertyNode pNode, Expression other) {
        String getterName = "get" + Verifier.capitalize(pNode.getName());
        Expression selfGetter = new MethodCallExpression(VariableExpression.THIS_EXPRESSION, getterName, MethodCallExpression.NO_ARGUMENTS);
        Expression otherGetter = new MethodCallExpression(other, getterName, MethodCallExpression.NO_ARGUMENTS);
        return new BooleanExpression(new BinaryExpression(selfGetter, COMPARE_NOT_EQUAL, otherGetter));
    }

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                new ExpressionStatement(expression));
    }


    public static Statement createConstructorStatementDefault(FieldNode fNode) {
        final String name = fNode.getName();
        final Expression fieldExpr = new PropertyExpression(VariableExpression.THIS_EXPRESSION, name);
        Expression initExpr = fNode.getInitialValueExpression();
        if (initExpr == null) initExpr = ConstantExpression.NULL;
        Expression value = findArg(name);
        return new IfStatement(
                equalsNullExpr(value),
                new IfStatement(
                        equalsNullExpr(initExpr),
                        new EmptyStatement(),

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