protected IExpressionNode ParseLambda()
{
if (Tokenizer.Token == TokenType.EmptyParen)
{
ValidateToken(NextToken(true), TokenType.Lambda);
NextToken(true);
var item = new LambdaExpressionNode(ParseExpression(), null);
return item;
}
if (Tokenizer.Token == TokenType.OpenParen)
{
NextToken(true);
IExpressionNode node = ParseExpression();
var memberExp = node as IMemberExpressionNode;
if (memberExp != null && memberExp.Target == null)
{
var nodes = new List<IExpressionNode> { memberExp };
if (Tokenizer.Token == TokenType.Comma)
{
NextToken(true);
nodes.AddRange(ParseArguments());
ValidateToken(TokenType.CloseParen);
}
if (Tokenizer.Token == TokenType.CloseParen)
{
NextToken(true);
if (nodes.Count > 1)
ValidateToken(TokenType.Lambda);
if (Tokenizer.Token == TokenType.Lambda)
{
NextToken(true);
for (int index = 0; index < nodes.Count; index++)
ValidateLambdaParameter(nodes[index]);
return new LambdaExpressionNode(ParseExpression(),
nodes.Cast<IMemberExpressionNode>().Select(expressionNode => expressionNode.Member));
}
return ParseBinaryExpression(node);
}
}
ValidateToken(TokenType.CloseParen);
NextToken(true);
return ParseBinaryExpression(node);
}
if (Tokenizer.Token == TokenType.Identifier)
{
IExpressionNode node = ParseExpression();
var memberExp = node as IMemberExpressionNode;
if (memberExp != null && memberExp.Target == null && Tokenizer.Token == TokenType.Lambda)
{
NextToken(true);
return new LambdaExpressionNode(ParseExpression(), new[] { memberExp.Member });
}
return node;
}
return ParseExpression();
}
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 --> $GetEventArgs()
if (member.Member == "args" || member.Member == "arg")
return new MethodCallExpressionNode(member.Target, DefaultBindingParserHandler.GetEventArgsMethod, null, null);
//$binding --> $GetBinding()
if (member.Member == "binding")
return new MethodCallExpressionNode(member.Target, DefaultBindingParserHandler.GetBindingMethod, null, null);
}
var methodCallExp = node as IMethodCallExpressionNode;
if (methodCallExp != null && methodCallExp.Target is ResourceExpressionNode)
{
//$OneTime(Expression) --> oneTimeImpl.GetValue(GetBinding(), () => Expression)
if (methodCallExp.Method == "OneTime" && methodCallExp.Arguments.Count == 1)
{
DataConstant<object> constant = Guid.NewGuid().ToString("n");
var idEx = new ConstantExpressionNode(constant);
var getBindEx = new MethodCallExpressionNode(ResourceExpressionNode.DynamicInstance, DefaultBindingParserHandler.GetBindingMethod, null, null);
IExpressionNode getValueEx = new LambdaExpressionNode(methodCallExp.Arguments[0], null);
return new MethodCallExpressionNode(new ConstantExpressionNode(typeof(BindingExtensions)), "GetOrAddValue", new[]
{
getBindEx, idEx, getValueEx
}, null).Accept(this);
}
//Alias ($Format(), $MethodName, etc) --> type.Format()
Type type;
string method;
if (BindingServiceProvider.ResourceResolver.TryGetMethodAlias(methodCallExp.Method, out type, out method))
return new MethodCallExpressionNode(new ConstantExpressionNode(type), method, methodCallExp.Arguments, methodCallExp.TypeArgs).Accept(this);
}
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;
}
