Examples of org.codehaus.groovy.ast.ClassNode

org.codehaus.groovy.ast.ClassNode
Represents a class in the AST.
A ClassNode should be created using the methods in ClassHelper. This ClassNode may be used to represent a class declaration or any other type. This class uses a proxy meschanism allowing to create a class for a plain name at ast creation time. In another phase of the compiler the real ClassNode for the plain name may be found. To avoid the need of exchanging this ClassNode with an instance of the correct ClassNode the correct ClassNode is set as redirect. Most method calls are then redirected to that ClassNode.
Note: the proxy mechanism is only allowed for classes being marked as primary ClassNode which means they represent no actual class. The redirect itself can be any type of ClassNode
To descirbe generic type signature see {@link #getGenericsTypes()} and{@link #setGenericsTypes(GenericsType[])}. These emthods are not proxied, they describe the type signature used at the point of declaration or the type signatures provided by the class. If the type signatures provided by the class are needed, then a call to {@link #redirect()} will help. @see org.codehaus.groovy.ast.ClassHelper @author James Strachan @author Jochen Theodorou @version $Revision: 13567 $


    /**
     * duplicate top element
     */
    public void dup() {
        ClassNode type = getTopOperand();
        stack.add(type);
        MethodVisitor mv = controller.getMethodVisitor();
        if (type == ClassHelper.double_TYPE || type == ClassHelper.long_TYPE) {
            mv.visitInsn(DUP2);
        } else {

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    }


    public ClassNode box() {
        MethodVisitor mv = controller.getMethodVisitor();
        int size = stack.size();
        ClassNode type = stack.get(size-1);
        if (BytecodeHelper.box(mv, type)) {
            type = ClassHelper.getWrapper(type);
            BytecodeHelper.doCast(mv, type);
        }
        stack.set(size-1, type);

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     * swap two top level operands
     */
    public void swap() {
        MethodVisitor mv = controller.getMethodVisitor();
        int size = stack.size();
        ClassNode b = stack.get(size-1);
        ClassNode a = stack.get(size-2);
        //        dup_x1:     --- 
        //        dup_x2:     aab  -> baab
        //        dup2_x1:    abb  -> bbabb
        //        dup2_x2:    aabb -> bbaabb
        //        b = top element, a = element under b

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    public void doGroovyCast(ClassNode targetType) {
        doConvertAndCast(targetType,false);
    }
    
    public void doGroovyCast(Variable v) {
        ClassNode targetType = v.getOriginType();
        doConvertAndCast(targetType,false);
    }

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        try {
            if (size==0) throw new ArrayIndexOutOfBoundsException("size==0");
        } catch (ArrayIndexOutOfBoundsException ai) {
            throw ai;
        }
        ClassNode top = stack.get(size-1);
        targetType = targetType.redirect();
        if (targetType == top) return;
        
        MethodVisitor mv = controller.getMethodVisitor();
        if (coerce) {
            if (top.isDerivedFrom(targetType)) return;
            box();
            (new ClassExpression(targetType)).visit(controller.getAcg());
            remove(1);
            asTypeMethod.call(mv);
            BytecodeHelper.doCast(mv,targetType);
            replace(targetType);
            return;
        }
        
        boolean primTarget = ClassHelper.isPrimitiveType(targetType);
        boolean primTop = ClassHelper.isPrimitiveType(top);


        if (primTop && primTarget) {
            //TODO: use jvm primitive conversions
            // here we box and unbox to get the goal type
            if (convertPrimitive(top, targetType)) {
                replace(targetType);
                return;
            }
            box();
        } else if (primTop) {
            // top is primitive, target is not
            // so box and do groovy cast
            box();
            (new ClassExpression(targetType)).visit(controller.getAcg());
            remove(1);
            castToTypeMethod.call(mv);
        } else if (primTarget) {
            // top is not primitive so unbox
            // leave that BH#doCast later
        } else if (!(top.isDerivedFrom(targetType))) {
            // top and target are not primitive and top is not derived from target
            (new ClassExpression(targetType)).visit(controller.getAcg());
            remove(1);
            castToTypeMethod.call(mv);
        }

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     * load the constant on the operand stack. 
     */
    public void pushConstant(ConstantExpression expression) {
        MethodVisitor mv = controller.getMethodVisitor();
        Object value = expression.getValue();
        ClassNode type = expression.getType().redirect();
        boolean asPrimitive = ClassHelper.isPrimitiveType(type);
        
        if (value == null) {
            mv.visitInsn(ACONST_NULL);
        } else if (asPrimitive) {
            mv.visitLdcInsn(value);
        } else if (value instanceof Character) {
            mv.visitLdcInsn(value);
            BytecodeHelper.box(mv, type); // does not change this.stack field contents
        } else if (value instanceof Number) {
            if (value instanceof BigDecimal) {
                String className = BytecodeHelper.getClassInternalName(value.getClass().getName());
                mv.visitTypeInsn(NEW, className);
                mv.visitInsn(DUP);
                mv.visitLdcInsn(value.toString());
                mv.visitMethodInsn(INVOKESPECIAL, className, "<init>", "(Ljava/lang/String;)V");
            } else if (value instanceof BigInteger) {
                String className = BytecodeHelper.getClassInternalName(value.getClass().getName());
                mv.visitTypeInsn(NEW, className);
                mv.visitInsn(DUP);
                mv.visitLdcInsn(value.toString());
                mv.visitMethodInsn(INVOKESPECIAL, className, "<init>", "(Ljava/lang/String;)V");
            } else if (value instanceof Long) {
                long l = (Long) value;
                if (l==0) {
                    mv.visitInsn(LCONST_0);
                } else if (l==1) {
                    mv.visitInsn(LCONST_1);
                } else {
                    mv.visitLdcInsn(value);
                }
                BytecodeHelper.box(mv, ClassHelper.getUnwrapper(type)); // does not change this.stack field contents
                BytecodeHelper.doCast(mv, type);
            } else {
                mv.visitLdcInsn(value);
                BytecodeHelper.box(mv, ClassHelper.getUnwrapper(type)); // does not change this.stack field contents
                BytecodeHelper.doCast(mv, type);
            }
        } else if (value instanceof Boolean) {
            Boolean bool = (Boolean) value;
            String text = (bool.booleanValue()) ? "TRUE" : "FALSE";
            mv.visitFieldInsn(GETSTATIC, "java/lang/Boolean", text, "Ljava/lang/Boolean;");
        } else if (value instanceof String) {
            mv.visitLdcInsn(value);
        } else {
            throw new ClassGeneratorException(
                    "Cannot generate bytecode for constant: " + value + " of type: " + type.getName());
        }
        
        push(type);
    }

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        if (compileStack.isLHS()) {
            storeVar(variable);
        } else {
            MethodVisitor mv = controller.getMethodVisitor();
            int idx = variable.getIndex();
            ClassNode type = variable.getType();
            
            if (variable.isHolder()) {
                mv.visitVarInsn(ALOAD, idx);
                if (!useReferenceDirectly) {
                    mv.visitMethodInsn(INVOKEVIRTUAL, "groovy/lang/Reference", "get", "()Ljava/lang/Object;");

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    }


    public void storeVar(BytecodeVariable variable) {
        MethodVisitor mv = controller.getMethodVisitor();
        int idx = variable.getIndex();
        ClassNode type = variable.getType();
        // value is on stack
        if (variable.isHolder()) {
            box();
            mv.visitVarInsn(ALOAD, idx);
            mv.visitTypeInsn(CHECKCAST, "groovy/lang/Reference");

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 * @version $Revision: 21240 $
 */
public class GStringTest extends TestSupport {


    public void testConstructor() throws Exception {
        ClassNode classNode = new ClassNode("Foo", ACC_PUBLIC, ClassHelper.OBJECT_TYPE);


        //Statement printStatement = createPrintlnStatement(new VariableExpression("str"));


        // simulate "Hello ${user}!"
        GStringExpression compositeStringExpr = new GStringExpression("hello ${user}!");
        compositeStringExpr.addString(new ConstantExpression("Hello "));
        compositeStringExpr.addValue(new VariableExpression("user"));
        compositeStringExpr.addString(new ConstantExpression("!"));
        BlockStatement block = new BlockStatement();
        block.addStatement(
                new ExpressionStatement(
                        new DeclarationExpression(
                                new VariableExpression("user"),
                                Token.newSymbol("=", -1, -1),
                                new ConstantExpression("World"))));
        block.addStatement(
                new ExpressionStatement(
                        new DeclarationExpression(new VariableExpression("str"), Token.newSymbol("=", -1, -1), compositeStringExpr)));
        block.addStatement(
                new ExpressionStatement(
                        new MethodCallExpression(VariableExpression.THIS_EXPRESSION, "println", new VariableExpression("str"))));


        block.addStatement(
                new ExpressionStatement(
                        new DeclarationExpression(
                                new VariableExpression("text"),
                                Token.newSymbol("=", -1, -1),
                                new MethodCallExpression(new VariableExpression("str"), "toString", MethodCallExpression.NO_ARGUMENTS))));


        block.addStatement(
                new AssertStatement(
                        new BooleanExpression(
                                new BinaryExpression(
                                        new VariableExpression("text"),
                                        Token.newSymbol("==", -1, -1),
                                        new ConstantExpression("Hello World!"))),
                        new ConstantExpression("Assertion failed") // TODO FIX if empty, AssertionWriter fails because source text is null
                )
        );
        classNode.addMethod(new MethodNode("stringDemo", ACC_PUBLIC, ClassHelper.VOID_TYPE, Parameter.EMPTY_ARRAY, ClassNode.EMPTY_ARRAY, block));


        Class fooClass = loadClass(classNode);
        assertTrue("Loaded a new class", fooClass != null);


        Object bean = fooClass.newInstance();

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        AnnotationNode node = (AnnotationNode) nodes[0];
        if (!MY_TYPE.equals(node.getClassNode())) return;


        if (parent instanceof FieldNode) {
            FieldNode fNode = (FieldNode) parent;
            ClassNode cNode = fNode.getDeclaringClass();
            if (cNode.getProperty(fNode.getName()) == null) {
                addError("Error during " + MY_TYPE_NAME + " processing. Field '" + fNode.getName() +
                        "' doesn't appear to be a property; incorrect visibility?", fNode, source);
                return;
            }
            ClassNode fType = fNode.getType();
            if (fType.isArray()) {
                addArraySetter(fNode);
                addArrayGetter(fNode);
            } else if (fType.isDerivedFrom(LIST_TYPE)) {
                addListSetter(fNode);
                addListGetter(fNode);
            } else {
                addError("Error during " + MY_TYPE_NAME + " processing. Non-Indexable property '" + fNode.getName() +
                        "' found. Type must be array or list but found " + fType.getName(), fNode, source);
            }
        }
    }

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