private static Expression ProvideExpression(IBuilderSyntaxContext context)
{
var mExp = context.MethodExpression;
var name = mExp.Method.Name;
if (name == "EventArgs")
{
if (context.IsSameExpression())
{
return(Expression.Convert(Expression.Call(GetEventArgsMethod, context.ContextParameter), mExp.Method.ReturnType));
}
return(null);
}
if (name == "ResourceMethod")
{
if (!context.IsSameExpression())
{
return(null);
}
var typeArgsEx = Expression.NewArrayInit(typeof(Type), Expression.Constant(mExp.Method.ReturnType, typeof(Type)));
return(Expression.Convert(Expression.Call(ResourceMethodImplMethod, mExp.Arguments[1], typeArgsEx,
context.ContextParameter, mExp.Arguments[2]), context.Expression.Type));
}
if (name == "OneTime")
{
if (!context.IsSameExpression())
{
return(null);
}
var item = Expression.Constant(new MacrosExpressionVisitor.OneTimeImpl());
var parameter = Expression.Lambda(mExp.Arguments[1], Empty.Array <ParameterExpression>());
return(Expression.Call(item, MacrosExpressionVisitor.OneTimeImpl.GetValueMethod.MakeGenericMethod(mExp.Arguments[1].Type), parameter));
}
if (name == "GetErrors")
{
if (!context.IsSameExpression())
{
return(null);
}
var id = Guid.NewGuid();
var args = new List <Expression>();
var members = new List <string>();
var arrayExpression = mExp.Arguments[1] as NewArrayExpression;
if (arrayExpression != null)
{
for (int i = 0; i < arrayExpression.Expressions.Count; i++)
{
var constantExpression = arrayExpression.Expressions[i] as ConstantExpression;
if (constantExpression == null)
{
args.Add(arrayExpression.Expressions[i]);
}
else
{
members.Add((string)constantExpression.Value);
}
}
}
if (args.Count == 0)
{
args.Add(Expression.Call(ResourceMethodInfo.MakeGenericMethod(typeof(object)), Expression.Constant(null, typeof(IBindingSyntaxContext)),
Expression.Constant(BindingServiceProvider.ResourceResolver.BindingSourceResourceName)));
}
context.AddBuildCallback(syntax =>
{
var behaviors = syntax.Builder.GetOrAddBehaviors();
if (!behaviors.Any(behavior => behavior is NotifyDataErrorsAggregatorBehavior))
{
behaviors.Clear();
behaviors.Add(new OneTimeBindingMode(false));
}
behaviors.Add(new NotifyDataErrorsAggregatorBehavior(id)
{
ErrorPaths = members.ToArray()
});
});
var array = Expression.NewArrayInit(typeof(object), args.Select(e => ExpressionReflectionManager.ConvertIfNeed(e, typeof(object), false)));
return(Expression.Call(GetErrorsMethod, Expression.Constant(id), context.ContextParameter, array));
}
Expression lastExpression;
string path = string.Empty;
if (!context.IsSameExpression() &&
!BindingExtensions.TryGetMemberPath(context.Expression, ".", false, out lastExpression, out path) &&
lastExpression != mExp)
{
return(null);
}
if (name == AttachedMemberConstants.DataContext)
{
return(context.GetOrAddParameterExpression(string.Empty, path, context.Expression,
(dataContext, s) => BindingExtensions.CreateBindingSource(dataContext, s, null, true)));
}
if (name == SelfMethodName || name == RootMethodName || name == ResourceMethodName || name == SourceMethodName)
{
string resourceName;
switch (name)
{
case SelfMethodName:
resourceName = BindingServiceProvider.ResourceResolver.SelfResourceName;
break;
case RootMethodName:
resourceName = BindingServiceProvider.ResourceResolver.RootElementResourceName;
break;
case SourceMethodName:
resourceName = BindingServiceProvider.ResourceResolver.BindingSourceResourceName;
break;
case ResourceMethodName:
mExp.Arguments[1].TryGetStaticValue(out resourceName, true);
if (mExp.Arguments.Count == 3)
{
#pragma warning disable 618
LambdaExpression lambda = mExp.Arguments[2] as LambdaExpression;
if (lambda == null)
{
lambda = (LambdaExpression)((UnaryExpression)mExp.Arguments[2]).Operand;
}
path = BindingExtensions.MergePath(lambda.GetMemberInfo().Name, path);
#pragma warning restore 618
}
break;
default:
mExp.Arguments[1].TryGetStaticValue(out resourceName, true);
break;
}
return(context.GetOrAddParameterExpression("res:" + resourceName, path, context.Expression,
(dataContext, s) =>
{
var value = BindingServiceProvider
.ResourceResolver
.ResolveObject(resourceName, dataContext, true);
return BindingExtensions.CreateBindingSource(dataContext, s, value);
}));
}
if (name == RelativeMethodName || name == "Element")
{
object firstArg;
if (mExp.Arguments.Count == 1)
{
firstArg = FirstLevelBoxed;
}
else
{
mExp.Arguments[1].TryGetStaticValue(out firstArg, true);
}
var node = name == RelativeMethodName
? RelativeSourceExpressionNode
.CreateRelativeSource(mExp.Method.ReturnType.AssemblyQualifiedName, (uint)firstArg, null)
: RelativeSourceExpressionNode.CreateElementSource(firstArg.ToString(), null);
return(context
.GetOrAddParameterExpression(name + mExp.Method.ReturnType.FullName, path, context.Expression,
(dataContext, s) => BindingExtensions.CreateBindingSource(node, dataContext.GetData(BindingBuilderConstants.Target), s)));
}
return(null);
}
public IExpressionNode Visit(IExpressionNode node)
{
var member = node as IMemberExpressionNode;
var resourceExpressionNode = member?.Target as ResourceExpressionNode;
if (resourceExpressionNode != null)
{
//$self, $this --> $BindingServiceProvider.ResourceResolver.SelfResourceName
if (member.Member == "self" || member.Member == "this")
{
if (resourceExpressionNode.Dynamic)
{
return(new MemberExpressionNode(member.Target, BindingServiceProvider.ResourceResolver.SelfResourceName));
}
return(new MethodCallExpressionNode(member.Target, DefaultBindingParserHandler.GetSelfMethod, null, null));
}
//$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(), $MethodName, etc) --> type.Format()
Type type;
string method;
if (BindingServiceProvider.ResourceResolver.TryGetMethodAlias(methodCallExp.Method, out type, out method))
{
return(new MethodCallExpressionNode(new ConstantExpressionNode(type), method, methodCallExp.Arguments, methodCallExp.TypeArgs).Accept(this));
}
}
var nodes = new List <IExpressionNode>();
var members = new List <string>();
string memberName = node.TryGetMemberName(true, true, nodes, members);
if (memberName == null)
{
var relativeExp = nodes[0] as IRelativeSourceExpressionNode;
if (relativeExp != null)
{
relativeExp.MergePath(BindingExtensions.MergePath(members));
return(relativeExp);
}
var methodCall = nodes[0] as IMethodCallExpressionNode;
if (methodCall != null && methodCall.Target is ResourceExpressionNode)
{
if (RelativeSourceAliases.Contains(methodCall.Method))
{
if ((methodCall.Arguments.Count == 1 || methodCall.Arguments.Count == 2) &&
methodCall.Arguments[0] is IMemberExpressionNode)
{
int level = 1;
var relativeType = (IMemberExpressionNode)methodCall.Arguments[0];
if (methodCall.Arguments.Count == 2)
{
level = (int)((IConstantExpressionNode)methodCall.Arguments[1]).Value;
}
return(RelativeSourceExpressionNode.CreateRelativeSource(relativeType.Member, (uint)level,
BindingExtensions.MergePath(members)));
}
}
if (ElementSourceAliases.Contains(methodCall.Method))
{
if (methodCall.Arguments.Count == 1 && methodCall.Arguments[0] is IMemberExpressionNode)
{
var elementSource = (IMemberExpressionNode)methodCall.Arguments[0];
return(RelativeSourceExpressionNode.CreateElementSource(elementSource.Member,
BindingExtensions.MergePath(members)));
}
}
}
}
return(node);
}
public IExpressionNode Visit(IExpressionNode node)
{
var member = node as IMemberExpressionNode;
if (member != null && member.Target is ResourceExpressionNode)
{
//$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);
}
