/// <summary>
/// Updates the relative source value.
/// </summary>
public void UpdateSource([NotNull] object target)
{
if (target == null)
{
throw BindingExceptionManager.InvalidBindingTarget(RelativeSourceNode.Path);
}
var path = RelativeSourceNode.Path ?? String.Empty;
if (!String.IsNullOrEmpty(Path))
{
path = BindingExtensions.MergePath(path, Path);
}
if (RelativeSourceNode.Type != RelativeSourceExpressionNode.SelfType)
{
if (RelativeSourceNode.Type == RelativeSourceExpressionNode.MemberSourceType)
{
target = BindingServiceProvider.ContextManager.GetBindingContext(target);
}
else
{
target = new ParentSourceValue(target, RelativeSourceNode);
}
}
IObserver observer = BindingServiceProvider.ObserverProvider.Observe(target, BindingPath.Create(path), false);
_bindingSource = new BindingSource(observer);
}
private IExpressionNode GetResourceMember(IExpressionNode node, string memberName, IList <IExpressionNode> nodes)
{
IExpressionNode staticValue;
if (_staticNodes.TryGetValue(node, out staticValue))
{
return(staticValue);
}
IBindingPath path = BindingServiceProvider.BindingPathFactory(memberName);
string firstMember = path.Parts[0];
Type type = BindingServiceProvider.ResourceResolver.ResolveType(firstMember, Context, false);
var resourceMember = (ResourceExpressionNode)nodes[0];
if (resourceMember.Dynamic && type == null)
{
memberName = BindingExtensions.MergePath(path.Parts.Skip(1).ToArray());
return(GetOrAddBindingMember("$" + path.Path, (s, i) => new BindingMemberExpressionNode(firstMember, memberName, s, i)));
}
bool dynamicMember = false;
IExpressionNode firstMemberNode = nodes[1];
if (!_staticNodes.TryGetValue(firstMemberNode, out staticValue))
{
if (type == null)
{
var value = BindingServiceProvider
.ResourceResolver
.ResolveObject(firstMember, Context, true)
.Value;
var dynamicObject = value as IDynamicObject;
if (dynamicObject == null || path.Parts.Count <= 1)
{
staticValue = new ConstantExpressionNode(value);
}
else
{
staticValue = new ConstantExpressionNode(dynamicObject.GetMember(path.Parts[1], Empty.Array <object>()));
dynamicMember = true;
}
}
else
{
staticValue = new ConstantExpressionNode(type, typeof(Type));
}
_staticNodes[firstMemberNode] = staticValue;
if (dynamicMember)
{
_staticNodes[nodes[2]] = staticValue;
}
}
if (firstMemberNode == node || (dynamicMember && node == nodes[2]))
{
return(staticValue);
}
return(node);
}
public void MergePath(string path)
{
_path = BindingExtensions.MergePath(_path, path);
}
public IExpressionNode Visit(IExpressionNode node)
{
var member = node as IMemberExpressionNode;
var resourceExpressionNode = member?.Target as ResourceExpressionNode;
if (resourceExpressionNode != null)
{
//$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 static Expression ProvideExpression(IBuilderSyntaxContext context)
{
var mExp = context.MethodExpression;
var name = mExp.Method.Name;
if (name == nameof(EventArgs))
{
if (context.IsSameExpression())
{
return(Expression.Convert(Expression.Call(GetEventArgsMethod, context.ContextParameter), mExp.Method.ReturnType));
}
return(null);
}
if (name == nameof(Binding))
{
if (context.IsSameExpression())
{
return(Expression.Convert(Expression.Call(GetBindingMethod, context.ContextParameter), mExp.Method.ReturnType));
}
return(null);
}
if (name == nameof(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 == nameof(OneTime))
{
if (!context.IsSameExpression())
{
return(null);
}
DataConstant <object> id = Guid.NewGuid().ToString("n");
var idEx = Expression.Constant(id);
var getBindEx = Expression.Call(GetBindingMethod, context.ContextParameter);
var valueEx = Expression.Lambda(mExp.Arguments[1], Empty.Array <ParameterExpression>());
var method = GetOneTimeValueMethod.MakeGenericMethod(mExp.Arguments[1].Type);
return(Expression.Call(method, new Expression[] { getBindEx, idEx, valueEx }));
}
if (name == nameof(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(builder =>
{
var behaviors = 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 == nameof(Self) || name == nameof(Root) || name == nameof(Resource) || name == nameof(Source))
{
string resourceName;
switch (name)
{
case nameof(Self):
resourceName = BindingServiceProvider.ResourceResolver.SelfResourceName;
break;
case nameof(Root):
resourceName = BindingServiceProvider.ResourceResolver.RootElementResourceName;
break;
case nameof(Source):
resourceName = BindingServiceProvider.ResourceResolver.BindingSourceResourceName;
break;
case nameof(Resource):
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 == nameof(Relative) || name == nameof(Element))
{
object firstArg;
if (mExp.Arguments.Count == 1)
{
firstArg = FirstLevelBoxed;
}
else
{
mExp.Arguments[1].TryGetStaticValue(out firstArg, true);
}
var relSource = name == nameof(Relative)
? new RelativeSourceInfo(mExp.Method.ReturnType.AssemblyQualifiedName, null, null, (uint)firstArg)
: new RelativeSourceInfo(RelativeSourceInfo.ElementSourceType, firstArg.ToString(), null, 0);
return(context
.GetOrAddParameterExpression(name + mExp.Method.ReturnType.FullName, path, context.Expression,
(dataContext, s) => BindingExtensions.CreateBindingSource(relSource, dataContext, dataContext.GetData(BindingBuilderConstants.Target), s)));
}
return(null);
}
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);
}
