83 lines
3.0 KiB
C#
83 lines
3.0 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 System.Activities.XamlIntegration
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{
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using System.Activities.Expressions;
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using System.Collections.Generic;
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using System.Linq.Expressions;
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using System.Reflection;
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class ExpressionTreeRewriter : ExpressionVisitor
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{
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IList<LocationReference> locationReferences;
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public ExpressionTreeRewriter()
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{
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}
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public ExpressionTreeRewriter(IList<LocationReference> locationReferences)
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{
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this.locationReferences = locationReferences;
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}
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protected override Expression VisitMember(MemberExpression node)
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{
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Expression newNode = null;
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if (node.Expression != null && node.Expression.NodeType == ExpressionType.Constant)
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{
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ConstantExpression constExpr = (ConstantExpression)node.Expression;
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if (typeof(CompiledDataContext).IsAssignableFrom(constExpr.Type) &&
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this.TryRewriteMemberExpressionNode(node, out newNode))
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{
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return newNode;
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}
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}
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return base.VisitMember(node);
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}
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protected override Expression VisitConstant(ConstantExpression node)
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{
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if (node.Value != null && node.Value.GetType() == typeof(InlinedLocationReference))
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{
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Expression newNode = node;
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ILocationReferenceWrapper inlinedReference = (ILocationReferenceWrapper)node.Value;
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if (inlinedReference != null)
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{
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newNode = Expression.Constant(inlinedReference.LocationReference, typeof(LocationReference));
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return newNode;
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}
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}
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return base.VisitConstant(node);
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}
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bool TryRewriteMemberExpressionNode(MemberExpression node, out Expression newNode)
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{
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newNode = null;
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if (this.locationReferences != null)
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{
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foreach (LocationReference locationReference in this.locationReferences)
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{
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if (node.Member.Name == locationReference.Name)
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{
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if (locationReference is ILocationReferenceWrapper)
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{
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newNode = ExpressionUtilities.CreateIdentifierExpression(((ILocationReferenceWrapper)locationReference).LocationReference);
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}
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else
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{
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newNode = ExpressionUtilities.CreateIdentifierExpression(locationReference);
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}
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return true;
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}
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}
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}
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return false;
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}
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}
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}
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