73 lines
2.9 KiB
C#
73 lines
2.9 KiB
C#
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//-----------------------------------------------------------------------------
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//-----------------------------------------------------------------------------
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namespace Microsoft.VisualBasic.Activities
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{
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using System;
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using System.Activities;
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using System.Activities.Expressions;
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using System.Activities.Validation;
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using System.Globalization;
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using System.Reflection;
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sealed class VisualBasicNameShadowingConstraint : Constraint
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{
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protected override void OnExecute(NativeActivityContext context, object objectToValidate, ValidationContext objectToValidateContext)
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{
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bool foundMultiple;
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ActivityWithResult boundExpression;
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LocationReference locationReference;
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ActivityWithResult activity = (ActivityWithResult)objectToValidate;
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foreach (RuntimeArgument runtimeArgument in activity.RuntimeArguments)
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{
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boundExpression = runtimeArgument.BoundArgument.Expression;
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if (boundExpression != null && boundExpression is ILocationReferenceWrapper)
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{
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locationReference = ((ILocationReferenceWrapper)boundExpression).LocationReference;
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if (locationReference != null)
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{
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foundMultiple = FindLocationReferencesFromEnvironment(objectToValidateContext.Environment, locationReference.Name);
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if (foundMultiple)
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{
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Constraint.AddValidationError(context, new ValidationError(SR.AmbiguousVBVariableReference(locationReference.Name)));
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}
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}
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}
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}
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}
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static bool FindLocationReferencesFromEnvironment(LocationReferenceEnvironment environment, string targetName)
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{
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LocationReference foundLocationReference = null;
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LocationReferenceEnvironment currentEnvironment;
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bool foundMultiple = false;
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currentEnvironment = environment;
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while (currentEnvironment != null)
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{
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foreach (LocationReference reference in currentEnvironment.GetLocationReferences())
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{
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if (string.Equals(reference.Name, targetName, StringComparison.OrdinalIgnoreCase))
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{
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if (foundLocationReference != null)
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{
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foundMultiple = true;
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return foundMultiple;
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}
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foundLocationReference = reference;
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}
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}
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currentEnvironment = currentEnvironment.Parent;
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}
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return foundMultiple;
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}
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}
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}
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