public static Expression<Func<TFrom, TTo>> AndLambdas<TFrom, TTo>(this Expression<Func<TFrom, TTo>> first, Expression<Func<TFrom, TTo>> second)
{
ParameterExpression paramToUse = first.Parameters[0];
Expression bodyLeft = first.Body;
ConversionVisitor visitor = new ConversionVisitor(paramToUse, second.Parameters[0]);
Expression bodyRight = visitor.Visit(second.Body);
return Expression.Lambda<Func<TFrom, TTo>>(Expression.MakeBinary(ExpressionType.AndAlso, bodyLeft, bodyRight), first.Parameters);
}
public static Expression <Func <TTo, TR> > Convert <TFrom, TR>(
Expression <Func <TFrom, TR> > e
)
{
var oldParameter = e.Parameters[0];
var newParameter = Expression.Parameter(typeof(TTo), oldParameter.Name);
var converter = new ConversionVisitor(newParameter, oldParameter);
var newBody = converter.Visit(e.Body);
return(Expression.Lambda <Func <TTo, TR> >(newBody, newParameter));
}
public static Expression <Func <TTo, TR> > Convert <TFrom, TR>(Expression <Func <TFrom, TR> > e)
{
if (e == null)
{
throw new ArgumentNullException(nameof(e));
}
var oldParameter = e.Parameters[0];
var newParameter = Expression.Parameter(typeof(TTo), oldParameter.Name);
var converter = new ConversionVisitor(newParameter, oldParameter);
var newBody = converter.Visit(e.Body);
return(Expression.Lambda <Func <TTo, TR> >(newBody, newParameter));
}
/// <summary>
/// Convert expression from type [TFrom] to type [TTo]
/// </summary>
/// <typeparam name="TFrom"></typeparam>
/// <typeparam name="TTo"></typeparam>
/// <typeparam name="TReturn"></typeparam>
/// <param name="e"></param>
/// <returns></returns>
public static Expression <Func <TTo, TResult> > Convert <TFrom, TTo, TResult>(Expression <Func <TFrom, TResult> > e)
{
if (e == null)
{
return(null);
}
var oldParameter = e.Parameters[0];
var newParameter = Expression.Parameter(typeof(TTo), oldParameter.Name);
var converter = new ConversionVisitor(newParameter, oldParameter);
try
{
var newBody = converter.Visit(e.Body);
return(Expression.Lambda <Func <TTo, TResult> >(newBody, newParameter));
}
catch (ArgumentException)
{
return(null);
}
}
public ExpressionResolutionResult ResolveExpression(Type currentType, Expression instanceParameter)
{
Expression currentChild = instanceParameter;
Type currentChildType = currentType;
foreach (var resolver in GetSourceValueResolvers())
{
var getter = resolver as IMemberGetter;
if (getter != null)
{
var memberInfo = getter.MemberInfo;
var propertyInfo = memberInfo as PropertyInfo;
if (propertyInfo != null)
{
currentChild = Expression.Property(currentChild, propertyInfo);
currentChildType = propertyInfo.PropertyType;
}
else
{
throw new NotImplementedException("Expressions mapping from methods not supported yet.");
}
}
else
{
var oldParameter = CustomExpression.Parameters.Single();
var newParameter = instanceParameter;
var converter = new ConversionVisitor(newParameter, oldParameter);
currentChild = converter.Visit(CustomExpression.Body);
currentChildType = currentChild.Type;
}
}
return(new ExpressionResolutionResult(currentChild, currentChildType));
}
private static ExpressionResolutionResult ResolveExpression(PropertyMap propertyMap, Type currentType, Expression instanceParameter)
{
Expression currentChild = instanceParameter;
Type currentChildType = currentType;
foreach (var resolver in propertyMap.GetSourceValueResolvers())
{
var getter = resolver as IMemberGetter;
if (getter != null)
{
var memberInfo = getter.MemberInfo;
var propertyInfo = memberInfo as PropertyInfo;
if (propertyInfo != null)
{
currentChild = Expression.Property(currentChild, propertyInfo);
currentChildType = propertyInfo.PropertyType;
}
else
{
currentChildType = currentChild.Type;
}
}
else
{
var oldParameter = propertyMap.CustomExpression.Parameters.Single();
var newParameter = instanceParameter;
var converter = new ConversionVisitor(newParameter, oldParameter);
currentChild = converter.Visit(propertyMap.CustomExpression.Body);
currentChildType = currentChild.Type;
}
}
return(new ExpressionResolutionResult(currentChild, currentChildType));
}
private LambdaExpression CreateMapExpression(
Type typeIn, Type typeOut)
{
var typeMap = ConfigurationProvider.FindTypeMapFor(typeIn, typeOut);
// this is the input parameter of this expression with name <variableName>
ParameterExpression instanceParameter = Expression.Parameter(typeIn);
var bindings = new List <MemberBinding>();
foreach (var propertyMap in typeMap.GetPropertyMaps().Where(pm => pm.CanResolveValue()))
{
var destinationProperty = propertyMap.DestinationProperty;
var destinationMember = destinationProperty.MemberInfo;
Expression currentChild = instanceParameter;
Type currentChildType = typeIn;
foreach (var resolver in propertyMap.GetSourceValueResolvers())
{
var getter = resolver as IMemberGetter;
if (getter != null)
{
var memberInfo = getter.MemberInfo;
var propertyInfo = memberInfo as PropertyInfo;
if (propertyInfo != null)
{
currentChild = Expression.Property(currentChild, propertyInfo);
currentChildType = propertyInfo.PropertyType;
}
}
else
{
var oldParameter =
((LambdaExpression)propertyMap.CustomExpression).Parameters.Single();
var newParameter = instanceParameter;
var converter = new ConversionVisitor(newParameter, oldParameter);
currentChild = converter.Visit(((LambdaExpression)propertyMap.CustomExpression).Body);
var propertyInfo = propertyMap.SourceMember as PropertyInfo;
if (propertyInfo != null)
{
currentChildType = propertyInfo.PropertyType;
}
}
}
var prop = destinationProperty.MemberInfo as PropertyInfo;
// next to lists, also arrays
// and objects!!!
if (prop != null &&
prop.PropertyType.GetInterface("IEnumerable", true) != null &&
prop.PropertyType != typeof(string))
{
Type destinationListType = prop.PropertyType.GetGenericArguments().First();
Type sourceListType = null;
// is list
sourceListType = currentChildType.GetGenericArguments().First();
//var newVariableName = "t" + (i++);
var transformedExpression = CreateMapExpression(sourceListType, destinationListType);
MethodCallExpression selectExpression = Expression.Call(
typeof(Enumerable),
"Select",
new[] { sourceListType, destinationListType },
currentChild,
transformedExpression);
if (typeof(IList).IsAssignableFrom(prop.PropertyType))
{
MethodCallExpression toListCallExpression = Expression.Call(
typeof(Enumerable),
"ToList",
new Type[] { destinationListType },
selectExpression);
// todo .ToArray()
bindings.Add(Expression.Bind(destinationMember, toListCallExpression));
}
else
{
// destination type implements ienumerable, but is not an ilist. allow deferred enumeration
bindings.Add(Expression.Bind(destinationMember, selectExpression));
}
}
else
{
// does of course not work for subclasses etc./generic ...
if (currentChildType != prop.PropertyType &&
// avoid nullable etc.
prop.PropertyType.BaseType != typeof(ValueType) &&
prop.PropertyType.BaseType != typeof(Enum))
{
var transformedExpression = CreateMapExpression(currentChildType, prop.PropertyType);
var expr2 = Expression.Invoke(
transformedExpression,
currentChild
);
bindings.Add(Expression.Bind(destinationMember, expr2));
}
else
{
bindings.Add(Expression.Bind(destinationMember, currentChild));
}
}
}
var total = Expression.MemberInit(
Expression.New(typeOut),
bindings.ToArray()
);
return(Expression.Lambda(total, instanceParameter));
}
void InsertComments(CompilerCompilationUnit top, ConversionVisitor conversionVisitor)
{
AstNode insertionPoint = conversionVisitor.Unit.FirstChild;
foreach (var special in top.SpecialsBag.Specials) {
AstNode newLeaf = null;
Role role = null;
bool isDocumentationComment = false;
var comment = special as SpecialsBag.Comment;
if (comment != null) {
// HACK: multiline documentation comment detection; better move this logic into the mcs tokenizer
bool isMultilineDocumentationComment = (comment.CommentType == SpecialsBag.CommentType.Multi && comment.Content.StartsWith("*", StringComparison.Ordinal) && !comment.Content.StartsWith("**", StringComparison.Ordinal));
isDocumentationComment = comment.CommentType == SpecialsBag.CommentType.Documentation || isMultilineDocumentationComment;
if (conversionVisitor.convertTypeSystemMode && !isDocumentationComment)
continue;
var type = isMultilineDocumentationComment ? CommentType.MultiLineDocumentation : (CommentType)comment.CommentType;
var start = new TextLocation(comment.Line, comment.Col);
var end = new TextLocation(comment.EndLine, comment.EndCol);
newLeaf = new Comment(type, start, end) {
StartsLine = comment.StartsLine,
Content = isMultilineDocumentationComment ? comment.Content.Substring(1) : comment.Content
};
role = Roles.Comment;
} else if (!GenerateTypeSystemMode) {
var pragmaDirective = special as SpecialsBag.PragmaPreProcessorDirective;
if (pragmaDirective != null) {
var pragma = new PragmaWarningPreprocessorDirective(new TextLocation(pragmaDirective.Line, pragmaDirective.Col), new TextLocation(pragmaDirective.EndLine, pragmaDirective.EndCol));
pragma.AddChild(new CSharpTokenNode(new TextLocation(pragmaDirective.Line, pragmaDirective.Col), PragmaWarningPreprocessorDirective.PragmaKeywordRole), PragmaWarningPreprocessorDirective.PragmaKeywordRole);
pragma.AddChild(new CSharpTokenNode(new TextLocation(pragmaDirective.Line, pragmaDirective.WarningColumn), PragmaWarningPreprocessorDirective.WarningKeywordRole), PragmaWarningPreprocessorDirective.WarningKeywordRole);
var pragmaRole = pragmaDirective.Disalbe ? PragmaWarningPreprocessorDirective.DisableKeywordRole : PragmaWarningPreprocessorDirective.RestoreKeywordRole;
pragma.AddChild(new CSharpTokenNode(new TextLocation(pragmaDirective.Line, pragmaDirective.DisableRestoreColumn), pragmaRole), pragmaRole);
foreach (var code in pragmaDirective.Codes) {
pragma.AddChild((PrimitiveExpression)conversionVisitor.Visit(code), PragmaWarningPreprocessorDirective.WarningRole);
}
newLeaf = pragma;
role = Roles.PreProcessorDirective;
goto end;
}
var lineDirective = special as SpecialsBag.LineProcessorDirective;
if (lineDirective != null) {
var pragma = new LinePreprocessorDirective(new TextLocation(lineDirective.Line, lineDirective.Col), new TextLocation(lineDirective.EndLine, lineDirective.EndCol));
pragma.LineNumber = lineDirective.LineNumber;
pragma.FileName = lineDirective.FileName;
newLeaf = pragma;
role = Roles.PreProcessorDirective;
goto end;
}
var directive = special as SpecialsBag.PreProcessorDirective;
if (directive != null) {
newLeaf = new PreProcessorDirective((PreProcessorDirectiveType)((int)directive.Cmd & 0xF), new TextLocation(directive.Line, directive.Col), new TextLocation(directive.EndLine, directive.EndCol)) {
Argument = directive.Arg,
Take = directive.Take
};
role = Roles.PreProcessorDirective;
}
end:
;
}
if (newLeaf != null) {
InsertComment(ref insertionPoint, newLeaf, role, isDocumentationComment, conversionVisitor.Unit);
}
}
if (!GenerateTypeSystemMode) {
// We cannot insert newlines in the same loop as comments/preprocessor directives
// because they are not correctly ordered in the specials bag
insertionPoint = conversionVisitor.Unit.FirstChild;
for (int i = 0; i < top.SpecialsBag.Specials.Count; i++) {
var newLine = top.SpecialsBag.Specials [i] as SpecialsBag.NewLineToken;
if (newLine != null) {
var newLeaf = new NewLineNode(new TextLocation(newLine.Line, newLine.Col + 1));
newLeaf.NewLineType = newLine.NewLine == SpecialsBag.NewLine.Unix ? UnicodeNewline.LF : UnicodeNewline.CRLF;
InsertComment(ref insertionPoint, newLeaf, Roles.NewLine, false, conversionVisitor.Unit);
}
}
}
}
private LambdaExpression CreateMapExpression(
Type typeIn, Type typeOut)
{
var typeMap = ConfigurationProvider.FindTypeMapFor(typeIn, typeOut);
if (typeMap == null)
{
throw new ArgumentException(string.Format("Type map for converting from \"{0}\" to \"{1}\" was not found. Please use Mapper.CreateMap<{0}, {1}>() to register a type map.", typeIn.Name, typeOut.Name));
}
// this is the input parameter of this expression with name <variableName>
ParameterExpression instanceParameter = Expression.Parameter(typeIn);
var bindings = new List <MemberBinding>();
foreach (var propertyMap in typeMap.GetPropertyMaps().Where(pm => pm.CanResolveValue()))
{
var destinationProperty = propertyMap.DestinationProperty;
var destinationMember = destinationProperty.MemberInfo;
Expression currentChild = instanceParameter;
Type currentChildType = typeIn;
foreach (var resolver in propertyMap.GetSourceValueResolvers())
{
var getter = resolver as IMemberGetter;
if (getter != null)
{
var memberInfo = getter.MemberInfo;
var propertyInfo = memberInfo as PropertyInfo;
if (propertyInfo != null)
{
currentChild = Expression.Property(currentChild, propertyInfo);
currentChildType = propertyInfo.PropertyType;
}
}
else
{
var oldParameter = propertyMap.CustomExpression.Parameters.Single();
var newParameter = instanceParameter;
var converter = new ConversionVisitor(newParameter, oldParameter);
currentChild = converter.Visit(propertyMap.CustomExpression.Body);
var propertyInfo = propertyMap.SourceMember as PropertyInfo;
if (propertyInfo != null)
{
currentChildType = propertyInfo.PropertyType;
}
else
{
currentChildType = currentChild.Type;
}
}
}
var prop = destinationProperty.MemberInfo as PropertyInfo;
// next to lists, also arrays
// and objects!!!
if (prop != null &&
prop.PropertyType.GetInterface("IEnumerable", true) != null &&
prop.PropertyType != typeof(string))
{
Type destinationListType = prop.PropertyType.GetGenericArguments().FirstOrDefault() ?? prop.PropertyType.GetElementType();
private LambdaExpression CreateMapExpression(
Type typeIn, Type typeOut)
{
var typeMap = ConfigurationProvider.FindTypeMapFor(typeIn, typeOut);
// this is the input parameter of this expression with name <variableName>
ParameterExpression instanceParameter = Expression.Parameter(typeIn);
var bindings = new List <MemberBinding>();
foreach (var propertyMap in typeMap.GetPropertyMaps().Where(pm => pm.CanResolveValue()))
{
var destinationProperty = propertyMap.DestinationProperty;
var destinationMember = destinationProperty.MemberInfo;
Expression currentChild = instanceParameter;
Type currentChildType = typeIn;
foreach (var resolver in propertyMap.GetSourceValueResolvers())
{
var getter = resolver as IMemberGetter;
if (getter != null)
{
var memberInfo = getter.MemberInfo;
var propertyInfo = memberInfo as PropertyInfo;
if (propertyInfo != null)
{
currentChild = Expression.Property(currentChild, propertyInfo);
currentChildType = propertyInfo.PropertyType;
}
}
else
{
var oldParameter =
((LambdaExpression)propertyMap.CustomExpression).Parameters.Single();
var newParameter = instanceParameter;
var converter = new ConversionVisitor(newParameter, oldParameter);
currentChild = converter.Visit(((LambdaExpression)propertyMap.CustomExpression).Body);
var propertyInfo = propertyMap.SourceMember as PropertyInfo;
if (propertyInfo != null)
{
currentChildType = propertyInfo.PropertyType;
}
}
}
var prop = destinationProperty.MemberInfo as PropertyInfo;
// next to lists, also arrays
// and objects!!!
if (prop != null &&
prop.PropertyType.GetInterface("IEnumerable", true) != null &&
prop.PropertyType != typeof(string))
{
Type destinationListType = prop.PropertyType.GetGenericArguments().First();
Type sourceListType = null;
// is list
sourceListType = currentChildType.GetGenericArguments().First();
//var newVariableName = "t" + (i++);
var transformedExpression = CreateMapExpression(sourceListType, destinationListType);
MethodCallExpression selectExpression = Expression.Call(
typeof(Enumerable),
"Select",
new[] { sourceListType, destinationListType },
currentChild,
transformedExpression);
if (typeof(IList).IsAssignableFrom(prop.PropertyType))
{
MethodCallExpression toListCallExpression = Expression.Call(
typeof(Enumerable),
"ToList",
new Type[] { destinationListType },
selectExpression);
// todo .ToArray()
bindings.Add(Expression.Bind(destinationMember, toListCallExpression));
}
else
{
// destination type implements ienumerable, but is not an ilist. allow deferred enumeration
bindings.Add(Expression.Bind(destinationMember, selectExpression));
}
}
else
{
// does of course not work for subclasses etc./generic ...
if (currentChildType != prop.PropertyType &&
// avoid nullable etc.
prop.PropertyType.BaseType != typeof(ValueType) &&
prop.PropertyType.BaseType != typeof(Enum))
{
var transformedExpression = CreateMapExpression(currentChildType, prop.PropertyType);
var expr2 = Expression.Invoke(
transformedExpression,
currentChild
);
bindings.Add(Expression.Bind(destinationMember, expr2));
}
else
{
bindings.Add(Expression.Bind(destinationMember, currentChild));
}
}
}
Expression total;
if (typeOut.IsAbstract)
{
if (typeMap.CustomMapper == null)
{
throw new AutoMapperMappingException(
String.Format("Abstract type {0} can not be mapped without custom mapper (tip: use ConvertUsing)", typeOut.Name));
}
// We are going to return roughly following expression
// typeOut (typeIn)x => (typeOut)(typeMap.CustomMapper.Invoke(new ResolutionContext(typeMap, x, typeIn, typeOut, options)))
// This expression generates a new ResolutionContext
// for the custom mapper (ResolveCore)
var context = Expression.MemberInit(
Expression.New(
typeof(ResolutionContext).GetConstructor(BindingFlags.Instance | BindingFlags.Public, null,
new Type[]
{
typeof(TypeMap), typeof(object),
typeof(Type),
typeof(Type),
typeof(MappingOperationOptions)
},
null),
new List <Expression>
{
Expression.Constant(typeMap),
instanceParameter, // Using the original parameter
Expression.Constant(typeIn),
Expression.Constant(typeOut),
Expression.Constant(new MappingOperationOptions())
})
);
// This expression gets the CustomMapper from the typeMap
Expression <Func <TypeMap, Func <ResolutionContext, object> > > method = x => x.CustomMapper;
var customMapper = Expression.Invoke(method, Expression.Constant(typeMap));
// This expression calls the Invoke method from the CustomMapper func
var invoke = Expression.Call(customMapper,
typeof(Func <ResolutionContext, object>).GetMethod("Invoke"), context);
// We have to convert the object from Invoke to typeOut
total = Expression.Convert(invoke, typeOut);
}
else
{
total = Expression.MemberInit(
Expression.New(typeOut),
bindings.ToArray()
);
}
return(Expression.Lambda(total, instanceParameter));
}