/// <summary>
/// Initializes a new instance of the <see cref="BoundEventBuilder"/> type.
/// </summary>
/// <param name="dataSource">The data source to which the event is being bound.</param>
/// <param name="dataSourceType">The type of the data source to which the expression is being bound.</param>
/// <param name="delegateType">The type of delegate that will be created to bind to the event.</param>
/// <param name="expression">The binding expression that represents the method to bind to the event.</param>
public BoundEventBuilder(Object dataSource, Type dataSourceType, Type delegateType, String expression)
: base(dataSourceType)
{
CreateParameters(delegateType);
CreateReturnTarget();
var path = BindingExpressions.GetBindingMemberPathPart(expression, false);
var current = AddDataSourceReference(expression, dataSource, dataSourceType);
current = AddMethodInvocation(expression, current, path);
AddReturn();
AddReturnLabel();
var lambdaBody = Expression.Block(variables, expressions);
var lambda = Expression.Lambda(delegateType, lambdaBody, parameters);
lambdaExpression = lambda;
}
/// <summary>
/// Initializes a new instance of the <see cref="DataBindingGetterBuilder"/> class.
/// </summary>
/// <param name="expressionType">The type of the bound expression.</param>
/// <param name="dataSourceType">The type of the data source to which the expression is being bound.</param>
/// <param name="expression">The binding expression with which to bind the dependency property.</param>
public DataBindingGetterBuilder(Type expressionType, Type dataSourceType, String expression)
: base(dataSourceType)
{
this.delegateType = typeof(DataBindingGetter <>).MakeGenericType(expressionType);
if (UltravioletPlatformInfo.IsRuntimeCodeGenerationSupported())
{
CreateReturnTarget(expressionType);
var path = BindingExpressions.GetBindingMemberPathPart(expression);
var pathParts = path.Contains(".") ? path.Split('.') : null;
var pathFinalPart = (pathParts == null) ? path : pathParts[pathParts.Length - 1];
var current = AddDataSourceReference();
if (pathParts != null)
{
for (int i = 0; i < pathParts.Length - 1; i++)
{
current = AddSafeReference(expression, current, pathParts[i]);
}
}
current = AddSafeReference(expression, current, pathFinalPart);
var result = Expression.Convert(current, expressionType);
AddReturn(result);
AddReturnLabel();
var lambdaBody = Expression.Block(variables, expressions);
var lambda = Expression.Lambda(delegateType, lambdaBody, parameters);
lambdaExpression = lambda;
}
else
{
var expParamDataSource = Expression.Parameter(typeof(Object), "dataSource");
var implMethod = typeof(DataBindingGetterBuilder).GetMethod(nameof(ReflectionBasedImplementation),
BindingFlags.NonPublic | BindingFlags.Static);
var path = BindingExpressions.GetBindingMemberPathPart(expression);
var pathParts = path.Contains(".") ? path.Split('.') : null;
var pathFinalPart = (pathParts == null) ? path : pathParts[pathParts.Length - 1];
var expDataSource = (Expression)Expression.Convert(expParamDataSource, dataSourceType);
var expDataSourceType = dataSourceType;
var current = dataSourceType;
if (pathParts != null)
{
for (int i = 0; i < pathParts.Length - 1; i++)
{
expDataSourceType = BindingExpressions.GetMemberType(BindingExpressions.FindPropertyOrField(expDataSourceType, pathParts[i]));
expDataSource = Expression.PropertyOrField(expDataSource, pathParts[i]);
}
}
var member = BindingExpressions.FindPropertyOrField(expDataSourceType, pathFinalPart);
if (!BindingExpressions.CanReadMember(member))
{
return;
}
var expImplMethodCall = Expression.Call(implMethod,
Expression.Constant(member),
Expression.Convert(expDataSource, typeof(Object)));
lambdaExpression = Expression.Lambda(delegateType,
Expression.Convert(
Expression.Convert(expImplMethodCall, BindingExpressions.GetMemberType(member)),
expressionType), expParamDataSource);
}
}
/// <summary>
/// Searches the specified XML element tree for binding expressions and adds them to the specified collection.
/// </summary>
/// <param name="state">The expression compiler's current state.</param>
/// <param name="dataSourceDefinition">The data source definition for the data source which is being compiled.</param>
/// <param name="dataSourceWrappedType">The type for which a data source wrapper is being compiled.</param>
/// <param name="element">The root of the XML element tree to search.</param>
/// <param name="expressions">The list to populate with any binding expressions that are found.</param>
private static void FindBindingExpressionsInDataSource(IExpressionCompilerState state, DataSourceDefinition dataSourceDefinition,
Type dataSourceWrappedType, XElement element, List <BindingExpressionInfo> expressions)
{
var templateAnnotation = element.Annotation <FrameworkTemplateNameAnnotation>();
if (templateAnnotation != null)
{
return;
}
var elementName = element.Name.LocalName;
var elementType = UvmlTypeAnalysis.GetPlaceholderType(dataSourceWrappedType, elementName);
if (elementType != null || state.GetKnownType(elementName, out elementType))
{
var attrs = Enumerable.Union(
element.Attributes().Select(x =>
new { Object = (XObject)x, Name = x.Name.LocalName, Value = x.Value }),
element.Elements().Where(x => x.Name.LocalName.StartsWith(elementName + ".")).Select(x =>
new { Object = (XObject)x, Name = x.Name.LocalName, Value = x.Value }));
foreach (var attr in attrs)
{
var attrValue = attr.Value;
if (!BindingExpressions.IsBindingExpression(attrValue))
{
continue;
}
var dprop = FindDependencyOrAttachedPropertyByName(state, attr.Name, elementType);
if (dprop == null)
{
throw new BindingExpressionCompilationErrorException(attr.Object, dataSourceDefinition.DefinitionPath,
CompilerStrings.OnlyDependencyPropertiesCanBeBound.Format(attr.Name));
}
var expText = BindingExpressions.GetBindingMemberPathPart(attrValue);
var expProp = GetBindablePropertyOnDataSource(dataSourceWrappedType, expText);
var expType = expProp?.PropertyType ?? dprop.PropertyType;
if (typeof(DataTemplate).IsAssignableFrom(expType))
{
continue;
}
expressions.Add(new BindingExpressionInfo(attr.Object, attrValue, expType)
{
GenerateGetter = true
});
}
if (element.Nodes().Count() == 1)
{
var singleChild = element.Nodes().Single();
if (singleChild.NodeType == XmlNodeType.Text)
{
var elementValue = ((XText)singleChild).Value;
if (BindingExpressions.IsBindingExpression(elementValue))
{
String defaultProperty;
if (!state.GetElementDefaultProperty(elementType, out defaultProperty) || defaultProperty == null)
{
throw new BindingExpressionCompilationErrorException(singleChild, dataSourceDefinition.DefinitionPath,
CompilerStrings.ElementDoesNotHaveDefaultProperty.Format(elementType.Name));
}
var dprop = FindDependencyOrAttachedPropertyByName(state, defaultProperty, elementType);
if (dprop == null)
{
throw new BindingExpressionCompilationErrorException(singleChild, dataSourceDefinition.DefinitionPath,
CompilerStrings.OnlyDependencyPropertiesCanBeBound.Format(defaultProperty));
}
var expText = BindingExpressions.GetBindingMemberPathPart(elementValue);
var expProp = GetBindablePropertyOnDataSource(dataSourceWrappedType, expText);
expressions.Add(new BindingExpressionInfo(singleChild,
elementValue, expProp?.PropertyType ?? dprop.PropertyType)
{
GenerateGetter = true
});
}
}
}
}
var children = element.Elements();
foreach (var child in children)
{
FindBindingExpressionsInDataSource(state, dataSourceDefinition,
dataSourceWrappedType, child, expressions);
}
}
/// <summary>
/// Writes a property which wraps a binding expression.
/// </summary>
/// <param name="state">The expression compiler's current state.</param>
/// <param name="dataSourceWrapperInfo">A <see cref="DataSourceWrapperInfo"/> describing the data source for which to write an expression property.</param>
/// <param name="expressionInfo">The binding expression for which to write a property.</param>
/// <param name="id">The expression's identifier within the view model.</param>
public void WriteExpressionProperty(ExpressionCompilerState state, DataSourceWrapperInfo dataSourceWrapperInfo, BindingExpressionInfo expressionInfo, Int32 id)
{
var isDependencyProperty = false;
var isSimpleDependencyProperty = false;
var expText = BindingExpressions.GetBindingMemberPathPart(expressionInfo.Expression);
var expTarget = default(String);
var expTargetType = dataSourceWrapperInfo.DataSourceType;
var expFormatString = BindingExpressions.GetBindingFormatStringPart(expressionInfo.Expression);
var targeted = GetExpressionTargetInfo(state, dataSourceWrapperInfo,
expressionInfo.Source, ref expText, out expTarget, out expTargetType);
var dprop = DependencyProperty.FindByName(expText, expTargetType);
var dpropField = default(FieldInfo);
if (dprop != null)
{
isDependencyProperty = true;
dpropField =
(from prop in dprop.OwnerType.GetFields(BindingFlags.Public | BindingFlags.Static)
where
prop.FieldType == typeof(DependencyProperty) &&
prop.GetValue(null) == dprop
select prop).SingleOrDefault();
if (dpropField == null)
{
throw new BindingExpressionCompilationErrorException(expressionInfo.Source, dataSourceWrapperInfo.DataSourceDefinition.DefinitionPath,
PresentationStrings.CannotFindDependencyPropertyField.Format(dprop.OwnerType.Name, dprop.Name));
}
if (String.IsNullOrEmpty(expFormatString) && !targeted)
{
isSimpleDependencyProperty = true;
}
}
WriteLine("[{0}(@\"{1}\", SimpleDependencyPropertyOwner = {2}, SimpleDependencyPropertyName = {3})]", typeof(CompiledBindingExpressionAttribute).FullName, expressionInfo.Expression.Replace("\"", "\"\""),
isSimpleDependencyProperty ? "typeof(" + GetCSharpTypeName(dprop.OwnerType) + ")" : "null",
isSimpleDependencyProperty ? "\"" + dprop.Name + "\"" : "null");
WriteLine("public {0} __UPF_Expression{1}", GetCSharpTypeName(expressionInfo.Type), id);
WriteLine("{");
if (expressionInfo.GenerateGetter)
{
expressionInfo.GetterLineStart = LineCount;
var getexp = default(String);
if (isDependencyProperty)
{
getexp = String.Format("{0}GetValue<{1}>({2}.{3})", expTarget,
GetCSharpTypeName(dprop.PropertyType),
GetCSharpTypeName(dprop.OwnerType), dpropField.Name);
}
else
{
getexp = String.Format("{0}{1}", expTarget, expText);
}
var hasFormatString = !String.IsNullOrEmpty(expFormatString);
expFormatString = hasFormatString ? String.Format("\"{{0:{0}}}\"", expFormatString) : "null";
if (IsStringType(expressionInfo.Type) || (expressionInfo.Type == typeof(Object) && hasFormatString))
{
WriteLine("get");
WriteLine("{");
WriteLine("var value = {0};", getexp);
WriteLine("return ({0})__UPF_ConvertToString(value, {1});", GetCSharpTypeName(expressionInfo.Type), expFormatString);
WriteLine("}");
}
else
{
WriteLine("get {{ return ({0})({1}); }}", GetCSharpTypeName(expressionInfo.Type), getexp);
}
expressionInfo.GetterLineEnd = LineCount - 1;
}
if (dprop != null && dprop.IsReadOnly)
{
expressionInfo.GenerateSetter = false;
}
if (expressionInfo.GenerateSetter)
{
var targetTypeName = expressionInfo.CS0266TargetType;
var targetTypeSpecified = !String.IsNullOrEmpty(targetTypeName);
expressionInfo.SetterLineStart = LineCount;
if (isDependencyProperty)
{
if (IsStringType(expressionInfo.Type))
{
WriteLine("set");
WriteLine("{");
WriteLine("var current = {0}GetValue<{1}>({2}.{3});",
expTarget, GetCSharpTypeName(dprop.PropertyType), GetCSharpTypeName(dprop.OwnerType), dpropField.Name);
WriteLine("{0}SetValue<{1}>({2}.{3}, __UPF_ConvertFromString(value.ToString(), current));",
expTarget, GetCSharpTypeName(dprop.PropertyType), GetCSharpTypeName(dprop.OwnerType), dpropField.Name);
WriteLine("}");
}
else
{
if (expressionInfo.NullableFixup)
{
WriteLine(targetTypeSpecified ? "set {{ {0}SetValue<{1}>({2}.{3}, ({4})(value ?? default({1}))); }}" : "set {{ {0}SetValue<{1}>({2}.{3}, value ?? default({1})); }}",
expTarget,
GetCSharpTypeName(dprop.PropertyType),
GetCSharpTypeName(dprop.OwnerType),
dpropField.Name, targetTypeName);
}
else
{
WriteLine(targetTypeSpecified ? "set {{ {0}SetValue<{1}>({2}.{3}, ({4})(value)); }}" : "set {{ {0}SetValue<{1}>({2}.{3}, value); }}",
expTarget,
GetCSharpTypeName(dprop.PropertyType),
GetCSharpTypeName(dprop.OwnerType),
dpropField.Name, targetTypeName);
}
}
}
else
{
if (expressionInfo.Type == typeof(String) || expressionInfo.Type == typeof(VersionedStringSource))
{
WriteLine("set");
WriteLine("{");
WriteLine("var current = {0}{1};", expTarget, expText);
WriteLine("{0}{1} = __UPF_ConvertFromString(value.ToString(), current);", expTarget, expText);
WriteLine("}");
}
else
{
if (expressionInfo.NullableFixup)
{
WriteLine(targetTypeSpecified ? "set {{ {0}{1} = ({3})(value ?? default({2})); }}" : "set {{ {0}{1} = value ?? default({2}); }}",
expTarget, expText, GetCSharpTypeName(Nullable.GetUnderlyingType(expressionInfo.Type)), targetTypeName);
}
else
{
WriteLine(targetTypeSpecified ? "set {{ {0}{1} = ({2})(value); }}" : "set {{ {0}{1} = value; }}",
expTarget, expText, targetTypeName);
}
}
}
expressionInfo.SetterLineEnd = LineCount - 1;
}
WriteLine("}");
}
