Examples with EmptyExpression org.codehaus.groovy.ast.expr.EmptyExpression used on opensource projects

Example 1 with EmptyExpression

use of org.codehaus.groovy.ast.expr.EmptyExpression in project groovy by apache.

the class LazyASTTransformation method getInitExpr.

private static Expression getInitExpr(ErrorCollecting xform, FieldNode fieldNode) {
    Expression initExpr = fieldNode.getInitialValueExpression();
    fieldNode.setInitialValueExpression(null);
    if (initExpr == null || initExpr instanceof EmptyExpression) {
        if (fieldNode.getType().isAbstract()) {
            xform.addError("You cannot lazily initialize '" + fieldNode.getName() + "' from the abstract class '" + fieldNode.getType().getName() + "'", fieldNode);
        }
        initExpr = ctorX(fieldNode.getType());
    }
    return initExpr;
}

Example 2 with EmptyExpression

use of org.codehaus.groovy.ast.expr.EmptyExpression in project groovy by apache.

the class MarkupBuilderCodeTransformer method transformBinaryExpression.

private Expression transformBinaryExpression(final BinaryExpression bin) {
    Expression left = bin.getLeftExpression();
    Expression right = bin.getRightExpression();
    boolean assignment = bin.getOperation().getType() == Types.ASSIGN;
    if (assignment && left instanceof VariableExpression) {
        VariableExpression var = (VariableExpression) left;
        if (var.getAccessedVariable() instanceof DynamicVariable) {
            String varName = var.getName();
            if (!"modelTypes".equals(varName)) {
                MethodCallExpression callGetModel = new MethodCallExpression(new VariableExpression("this"), "getModel", ArgumentListExpression.EMPTY_ARGUMENTS);
                callGetModel.setImplicitThis(true);
                callGetModel.setSourcePosition(left);
                MethodCallExpression mce = new MethodCallExpression(callGetModel, "put", new ArgumentListExpression(new ConstantExpression(varName), right));
                mce.setSourcePosition(left);
                mce.setImplicitThis(false);
                return transform(mce);
            }
        }
    }
    if (assignment && left instanceof VariableExpression && right instanceof ClosureExpression) {
        VariableExpression var = (VariableExpression) left;
        if ("modelTypes".equals(var.getName())) {
            // template declaring its expected types from model directly
            // modelTypes = {
            //  List<String> items
            //  ...
            // }
            Map<String, ClassNode> modelTypes = extractModelTypesFromClosureExpression((ClosureExpression) right);
            Expression result = new EmptyExpression();
            result.setSourcePosition(bin);
            classNode.putNodeMetaData(MarkupTemplateEngine.MODELTYPES_ASTKEY, modelTypes);
            return result;
        }
    }
    return super.transform(bin);
}

Example 3 with EmptyExpression

use of org.codehaus.groovy.ast.expr.EmptyExpression in project groovy by apache.

the class BinaryExpressionHelper method evaluateEqual.

public void evaluateEqual(BinaryExpression expression, boolean defineVariable) {
    AsmClassGenerator acg = controller.getAcg();
    CompileStack compileStack = controller.getCompileStack();
    OperandStack operandStack = controller.getOperandStack();
    Expression rightExpression = expression.getRightExpression();
    Expression leftExpression = expression.getLeftExpression();
    ClassNode lhsType = controller.getTypeChooser().resolveType(leftExpression, controller.getClassNode());
    if (defineVariable && rightExpression instanceof EmptyExpression && !(leftExpression instanceof TupleExpression)) {
        VariableExpression ve = (VariableExpression) leftExpression;
        BytecodeVariable var = compileStack.defineVariable(ve, controller.getTypeChooser().resolveType(ve, controller.getClassNode()), false);
        operandStack.loadOrStoreVariable(var, false);
        return;
    }
    // let's evaluate the RHS and store the result
    ClassNode rhsType;
    if (rightExpression instanceof ListExpression && lhsType.isArray()) {
        ListExpression list = (ListExpression) rightExpression;
        ArrayExpression array = new ArrayExpression(lhsType.getComponentType(), list.getExpressions());
        array.setSourcePosition(list);
        array.visit(acg);
    } else if (rightExpression instanceof EmptyExpression) {
        rhsType = leftExpression.getType();
        loadInitValue(rhsType);
    } else {
        rightExpression.visit(acg);
    }
    rhsType = operandStack.getTopOperand();
    boolean directAssignment = defineVariable && !(leftExpression instanceof TupleExpression);
    int rhsValueId;
    if (directAssignment) {
        VariableExpression var = (VariableExpression) leftExpression;
        if (var.isClosureSharedVariable() && ClassHelper.isPrimitiveType(rhsType)) {
            // GROOVY-5570: if a closure shared variable is a primitive type, it must be boxed
            rhsType = ClassHelper.getWrapper(rhsType);
            operandStack.box();
        }
        // form as it is closure shared
        if (var.isClosureSharedVariable() && ClassHelper.isPrimitiveType(var.getOriginType()) && isNull(rightExpression)) {
            operandStack.doGroovyCast(var.getOriginType());
            // these two are never reached in bytecode and only there 
            // to avoid verifyerrors and compiler infrastructure hazzle
            operandStack.box();
            operandStack.doGroovyCast(lhsType);
        }
        // normal type transformation 
        if (!ClassHelper.isPrimitiveType(lhsType) && isNull(rightExpression)) {
            operandStack.replace(lhsType);
        } else {
            operandStack.doGroovyCast(lhsType);
        }
        rhsType = lhsType;
        rhsValueId = compileStack.defineVariable(var, lhsType, true).getIndex();
    } else {
        rhsValueId = compileStack.defineTemporaryVariable("$rhs", rhsType, true);
    }
    //TODO: if rhs is VariableSlotLoader already, then skip crating a new one
    BytecodeExpression rhsValueLoader = new VariableSlotLoader(rhsType, rhsValueId, operandStack);
    // assignment for subscript
    if (leftExpression instanceof BinaryExpression) {
        BinaryExpression leftBinExpr = (BinaryExpression) leftExpression;
        if (leftBinExpr.getOperation().getType() == Types.LEFT_SQUARE_BRACKET) {
            assignToArray(expression, leftBinExpr.getLeftExpression(), leftBinExpr.getRightExpression(), rhsValueLoader);
        }
        compileStack.removeVar(rhsValueId);
        return;
    }
    compileStack.pushLHS(true);
    // multiple declaration
    if (leftExpression instanceof TupleExpression) {
        TupleExpression tuple = (TupleExpression) leftExpression;
        int i = 0;
        for (Expression e : tuple.getExpressions()) {
            VariableExpression var = (VariableExpression) e;
            MethodCallExpression call = new MethodCallExpression(rhsValueLoader, "getAt", new ArgumentListExpression(new ConstantExpression(i)));
            call.visit(acg);
            i++;
            if (defineVariable) {
                operandStack.doGroovyCast(var);
                compileStack.defineVariable(var, true);
                operandStack.remove(1);
            } else {
                acg.visitVariableExpression(var);
            }
        }
    } else // single declaration
    if (defineVariable) {
        rhsValueLoader.visit(acg);
        operandStack.remove(1);
        compileStack.popLHS();
        return;
    } else // normal assignment
    {
        int mark = operandStack.getStackLength();
        // to leave a copy of the rightExpression value on the stack after the assignment.
        rhsValueLoader.visit(acg);
        TypeChooser typeChooser = controller.getTypeChooser();
        ClassNode targetType = typeChooser.resolveType(leftExpression, controller.getClassNode());
        operandStack.doGroovyCast(targetType);
        leftExpression.visit(acg);
        operandStack.remove(operandStack.getStackLength() - mark);
    }
    compileStack.popLHS();
    // return value of assignment
    rhsValueLoader.visit(acg);
    compileStack.removeVar(rhsValueId);
}

Example 4 with EmptyExpression

use of org.codehaus.groovy.ast.expr.EmptyExpression in project groovy by apache.

the class StaticImportVisitor method findStaticPropertyAccessorByFullName.

private Expression findStaticPropertyAccessorByFullName(ClassNode staticImportType, String accessorMethodName) {
    // anything will do as we only check size == 1
    ArgumentListExpression dummyArgs = new ArgumentListExpression();
    dummyArgs.addExpression(new EmptyExpression());
    return findStaticMethod(staticImportType, accessorMethodName, (inLeftExpression ? dummyArgs : ArgumentListExpression.EMPTY_ARGUMENTS));
}

Example 5 with EmptyExpression

use of org.codehaus.groovy.ast.expr.EmptyExpression in project groovy by apache.

the class BaseScriptASTTransformation method changeBaseScriptTypeFromDeclaration.

private void changeBaseScriptTypeFromDeclaration(final DeclarationExpression de, final AnnotationNode node) {
    if (de.isMultipleAssignmentDeclaration()) {
        addError("Annotation " + MY_TYPE_NAME + " not supported with multiple assignment notation.", de);
        return;
    }
    if (!(de.getRightExpression() instanceof EmptyExpression)) {
        addError("Annotation " + MY_TYPE_NAME + " not supported with variable assignment.", de);
        return;
    }
    Expression value = node.getMember("value");
    if (value != null) {
        addError("Annotation " + MY_TYPE_NAME + " cannot have member 'value' if used on a declaration.", value);
        return;
    }
    ClassNode cNode = de.getDeclaringClass();
    ClassNode baseScriptType = de.getVariableExpression().getType().getPlainNodeReference();
    de.setRightExpression(new VariableExpression("this"));
    changeBaseScriptType(de, cNode, baseScriptType);
}