Examples with DelegatesTo groovy.lang.DelegatesTo used on opensource projects

Example 1 with DelegatesTo

use of groovy.lang.DelegatesTo in project groovy by apache.

the class StaticTypeCheckingVisitor method ensureValidSetter.

/**
 * Given a binary expression corresponding to an assignment, will check that
 * the type of the RHS matches one of the possible setters and if not, throw
 * a type checking error.
 *
 * @param expression      the assignment expression
 * @param leftExpression  left expression of the assignment
 * @param rightExpression right expression of the assignment
 * @param setterInfo      possible setters
 * @return {@code false} if valid setter found or {@code true} if type checking error created
 */
private boolean ensureValidSetter(final Expression expression, final Expression leftExpression, final Expression rightExpression, final SetterInfo setterInfo) {
    // for expressions like foo = { ... }
    // we know that the RHS type is a closure
    // but we must check if the binary expression is an assignment
    // because we need to check if a setter uses @DelegatesTo
    VariableExpression receiver = varX("%", setterInfo.receiverType);
    // for "x op= y" expression, find type as if it was "x = x op y"
    Expression valueExpression = rightExpression;
    if (isCompoundAssignment(expression)) {
        Token op = ((BinaryExpression) expression).getOperation();
        if (op.getType() == ELVIS_EQUAL) {
            // GROOVY-10419: "x ?= y"
            valueExpression = elvisX(leftExpression, rightExpression);
        } else {
            op = Token.newSymbol(TokenUtil.removeAssignment(op.getType()), op.getStartLine(), op.getStartColumn());
            valueExpression = binX(leftExpression, op, rightExpression);
        }
    }
    Function<Expression, MethodNode> setterCall = right -> {
        MethodCallExpression call = callX(receiver, setterInfo.name, right);
        call.setImplicitThis(false);
        visitMethodCallExpression(call);
        return call.getNodeMetaData(DIRECT_METHOD_CALL_TARGET);
    };
    Function<MethodNode, ClassNode> setterType = setter -> {
        ClassNode type = setter.getParameters()[0].getOriginType();
        if (!setter.isStatic() && !(setter instanceof ExtensionMethodNode) && GenericsUtils.hasUnresolvedGenerics(type)) {
            type = applyGenericsContext(extractPlaceHolders(setterInfo.receiverType, setter.getDeclaringClass()), type);
        }
        return type;
    };
    MethodNode methodTarget = setterCall.apply(valueExpression);
    if (methodTarget == null && !isCompoundAssignment(expression)) {
        // if no direct match, try implicit conversion
        for (MethodNode setter : setterInfo.setters) {
            ClassNode lType = setterType.apply(setter);
            ClassNode rType = getDeclaredOrInferredType(valueExpression);
            if (checkCompatibleAssignmentTypes(lType, rType, valueExpression, false)) {
                methodTarget = setterCall.apply(castX(lType, valueExpression));
                if (methodTarget != null) {
                    break;
                }
            }
        }
    }
    if (methodTarget != null) {
        for (MethodNode setter : setterInfo.setters) {
            if (setter == methodTarget) {
                leftExpression.putNodeMetaData(DIRECT_METHOD_CALL_TARGET, methodTarget);
                // clear assumption
                leftExpression.removeNodeMetaData(INFERRED_TYPE);
                storeType(leftExpression, setterType.apply(methodTarget));
                break;
            }
        }
        return false;
    } else {
        ClassNode firstSetterType = setterType.apply(setterInfo.setters.get(0));
        addAssignmentError(firstSetterType, getType(valueExpression), expression);
        return true;
    }
}