public static bool TryFindArgumentFilterWithin(Expression expression, out IArgumentFilter argumentFilter)
{
Debug.Assert(expression != null);
var visitor = new ArgumentFilterVisitor();
visitor.Visit(expression);
argumentFilter = visitor.argumentFilter;
return argumentFilter != null;
}
public static bool TryFindArgumentFilterWithin(Expression expression, out IArgumentFilter argumentFilter)
{
Debug.Assert(expression != null);
var visitor = new ArgumentFilterVisitor();
visitor.Visit(expression);
argumentFilter = visitor.argumentFilter;
return(argumentFilter != null);
}
public override Expression Visit(Expression node)
{
if (node.NodeType == ExpressionType.Convert || node.NodeType == ExpressionType.Call)
{
return(base.Visit(node));
}
object value;
if (ValueExtractor.TryFindValueWithin(node, out value))
{
this.argumentFilter = new IsArgumentFilter(value);
return(node);
}
return(node);
}
protected override Expression VisitMethodCall(MethodCallExpression node)
{
var filterMethod = node
.Method
.DeclaringType
.GetTypeInfo()
.DeclaredMethods
.Where(
declaredMethod =>
declaredMethod.IsStatic &&
declaredMethod.Name == node.Method.Name + "Filter" &&
declaredMethod.GetParameters().Length == node.Arguments.Count)
.FirstOrDefault();
if (filterMethod != null && filterMethod.ReturnType == typeof(IArgumentFilter))
{
if (node.Method.IsGenericMethod)
{
filterMethod = filterMethod.MakeGenericMethod(node.Method.GetGenericArguments());
}
var argumentsToFilterMethod = new object[node.Arguments.Count];
for (var i = 0; i < argumentsToFilterMethod.Length; ++i)
{
argumentsToFilterMethod[i] = ValueExtractor.FindValueWithin(node.Arguments[i]);
}
this.argumentFilter = filterMethod.Invoke(null, argumentsToFilterMethod) as IArgumentFilter;
}
else
{
object value;
if (ValueExtractor.TryFindValueWithin(node, out value))
{
this.argumentFilter = new IsArgumentFilter(value);
}
}
return(node);
}
protected override Expression VisitMethodCall(MethodCallExpression node)
{
var filterMethod = node
.Method
.DeclaringType
.GetMethods(BindingFlags.Static | BindingFlags.NonPublic)
.Where(x => x.Name == node.Method.Name + "Filter" && x.GetParameters().Length == node.Arguments.Count)
.FirstOrDefault();
if (filterMethod != null && filterMethod.ReturnType == typeof(IArgumentFilter))
{
if (node.Method.IsGenericMethod)
{
filterMethod = filterMethod.MakeGenericMethod(node.Method.GetGenericArguments());
}
var argumentsToFilterMethod = new object[node.Arguments.Count];
for (var i = 0; i < argumentsToFilterMethod.Length; ++i)
{
argumentsToFilterMethod[i] = ValueExtractor.FindValueWithin(node.Arguments[i]);
}
this.argumentFilter = filterMethod.Invoke(null, argumentsToFilterMethod) as IArgumentFilter;
}
else
{
object value;
if (ValueExtractor.TryFindValueWithin(node, out value))
{
this.argumentFilter = new IsArgumentFilter(value);
}
}
return node;
}
public LogicalNotArgumentFilter(IArgumentFilter child)
{
Debug.Assert(child != null);
this.child = child;
}
public override Expression Visit(Expression node)
{
if (node.NodeType == ExpressionType.Convert || node.NodeType == ExpressionType.Call)
{
return base.Visit(node);
}
object value;
if (ValueExtractor.TryFindValueWithin(node, out value))
{
this.argumentFilter = new IsArgumentFilter(value);
return node;
}
return node;
}
