/// <summary>
/// Dispatches the expression.
/// </summary>
/// <param name="node">The expression to visit.</param>
/// <returns>The modified expression, if it or any subexpression was modified; otherwise, returns the original expression.</returns>
public IExpressionNode Visit(IExpressionNode node)
{
var nodes = new List <IExpressionNode>();
var members = new List <string>();
string memberName = node.TryGetMemberName(true, true, nodes, members);
if (memberName == null)
{
var relativeExp = nodes[0] as IRelativeSourceExpressionNode;
if (relativeExp != null)
{
relativeExp.MergePath(string.Join(".", members));
return(relativeExp);
}
var methodCall = nodes[0] as MethodCallExpressionNode;
if (methodCall != null && methodCall.Target is ResourceExpressionNode)
{
if (RelativeSourceAliases.Contains(methodCall.Method))
{
if ((methodCall.Arguments.Count == 1 || methodCall.Arguments.Count == 2) && methodCall.Arguments[0] is IMemberExpressionNode)
{
int level = 1;
var relativeType = (IMemberExpressionNode)methodCall.Arguments[0];
if (methodCall.Arguments.Count == 2)
{
level = (int)((IConstantExpressionNode)methodCall.Arguments[1]).Value;
}
return(new RelativeSourceExpressionNode(relativeType.Member, (uint)level, string.Join(".", members)));
}
}
if (ElementSourceAliases.Contains(methodCall.Method))
{
if (methodCall.Arguments.Count == 1 && methodCall.Arguments[0] is IMemberExpressionNode)
{
var elementSource = (IMemberExpressionNode)methodCall.Arguments[0];
return(new RelativeSourceExpressionNode(elementSource.Member, string.Join(".", members)));
}
}
}
}
return(node);
}
public IExpressionNode Visit(IExpressionNode node)
{
var member = node as IMemberExpressionNode;
if (member != null && member.Target is ResourceExpressionNode)
{
//$self, $this --> $BindingServiceProvider.ResourceResolver.SelfResourceName
if (member.Member == "self" || member.Member == "this")
{
return(new MemberExpressionNode(member.Target, BindingServiceProvider.ResourceResolver.SelfResourceName));
}
//$context --> $BindingServiceProvider.ResourceResolver.DataContextResourceName
if (member.Member == "context")
{
return(new MemberExpressionNode(member.Target, BindingServiceProvider.ResourceResolver.DataContextResourceName));
}
//$args, $arg --> $GetEventArgs()
if (member.Member == "args" || member.Member == "arg")
{
return(new MethodCallExpressionNode(member.Target, DefaultBindingParserHandler.GetEventArgsMethod, Empty.Array <IExpressionNode>(), Empty.Array <string>()));
}
}
var methodCallExp = node as IMethodCallExpressionNode;
if (methodCallExp != null && methodCallExp.Target is ResourceExpressionNode)
{
//$Format() --> string.Format()
if (methodCallExp.Method == "Format")
{
return(new MethodCallExpressionNode(new ConstantExpressionNode(typeof(string)), methodCallExp.Method, methodCallExp.Arguments, methodCallExp.TypeArgs));
}
//$OneTime(Expression) --> oneTimeImpl.GetValue(() => Expression)
if (methodCallExp.Method == "OneTime" && methodCallExp.Arguments.Count == 1)
{
var item = new ConstantExpressionNode(new OneTimeImpl());
IExpressionNode parameter = new LambdaExpressionNode(methodCallExp.Arguments[0], null);
return(new MethodCallExpressionNode(item, OneTimeImpl.GetValueMethodName, new[] { parameter }, null));
}
}
var nodes = new List <IExpressionNode>();
var members = new List <string>();
string memberName = node.TryGetMemberName(true, true, nodes, members);
if (memberName == null)
{
var relativeExp = nodes[0] as IRelativeSourceExpressionNode;
if (relativeExp != null)
{
relativeExp.MergePath(BindingExtensions.MergePath(members));
return(relativeExp);
}
var methodCall = nodes[0] as IMethodCallExpressionNode;
if (methodCall != null && methodCall.Target is ResourceExpressionNode)
{
if (RelativeSourceAliases.Contains(methodCall.Method))
{
if ((methodCall.Arguments.Count == 1 || methodCall.Arguments.Count == 2) &&
methodCall.Arguments[0] is IMemberExpressionNode)
{
int level = 1;
var relativeType = (IMemberExpressionNode)methodCall.Arguments[0];
if (methodCall.Arguments.Count == 2)
{
level = (int)((IConstantExpressionNode)methodCall.Arguments[1]).Value;
}
return(RelativeSourceExpressionNode.CreateRelativeSource(relativeType.Member, (uint)level,
BindingExtensions.MergePath(members)));
}
}
if (ElementSourceAliases.Contains(methodCall.Method))
{
if (methodCall.Arguments.Count == 1 && methodCall.Arguments[0] is IMemberExpressionNode)
{
var elementSource = (IMemberExpressionNode)methodCall.Arguments[0];
return(RelativeSourceExpressionNode.CreateElementSource(elementSource.Member,
BindingExtensions.MergePath(members)));
}
}
}
}
return(node);
}