TypeInference CreateNestedInstance()
{
TypeInference c = new TypeInference(compilation, conversions);
c.algorithm = algorithm;
c.nestingLevel = nestingLevel + 1;
return c;
}
IEnumerable<ICompletionData> CreateTypeCompletionData(IType hintType)
{
var wrapper = new CompletionDataWrapper(this);
var state = GetState();
Func<IType, IType> pred = null;
Action<ICompletionData, IType> typeCallback = null;
var inferredTypesCategory = new Category("Inferred Types", null);
var derivedTypesCategory = new Category("Derived Types", null);
if (hintType != null) {
if (hintType.Kind != TypeKind.Unknown) {
var lookup = new MemberLookup(
ctx.CurrentTypeDefinition,
Compilation.MainAssembly
);
typeCallback = (data, t) => {
//check if type is in inheritance tree.
if (hintType.GetDefinition() != null &&
t.GetDefinition() != null &&
t.GetDefinition().IsDerivedFrom(hintType.GetDefinition())) {
data.CompletionCategory = derivedTypesCategory;
}
};
pred = t => {
if (t.Kind == TypeKind.Interface && hintType.Kind != TypeKind.Array) {
return null;
}
// check for valid constructors
if (t.GetConstructors().Count() > 0) {
bool isProtectedAllowed = currentType != null ?
currentType.Resolve(ctx).GetDefinition().IsDerivedFrom(t.GetDefinition()) : false;
if (!t.GetConstructors().Any(m => lookup.IsAccessible(m, isProtectedAllowed))) {
return null;
}
}
// check derived types
var typeDef = t.GetDefinition();
var hintDef = hintType.GetDefinition();
if (typeDef != null && hintDef != null && typeDef.IsDerivedFrom(hintDef)) {
var newType = wrapper.AddType(t, true);
if (newType != null) {
newType.CompletionCategory = inferredTypesCategory;
}
}
// check type inference
var typeInference = new TypeInference(Compilation);
typeInference.Algorithm = TypeInferenceAlgorithm.ImprovedReturnAllResults;
var inferedType = typeInference.FindTypeInBounds (new [] { t }, new [] { hintType });
if (inferedType != SpecialType.UnknownType) {
var newType = wrapper.AddType(inferedType, true);
if (newType != null) {
newType.CompletionCategory = inferredTypesCategory;
}
return null;
}
return t;
};
if (!(hintType.Kind == TypeKind.Interface && hintType.Kind != TypeKind.Array)) {
var hint = wrapper.AddType(hintType, true);
DefaultCompletionString = hint.DisplayText;
if (hint != null) {
hint.CompletionCategory = derivedTypesCategory;
}
}
if (hintType is ParameterizedType && hintType.TypeParameterCount == 1 && hintType.FullName == "System.Collections.Generic.IEnumerable") {
var arg = ((ParameterizedType)hintType).TypeArguments.FirstOrDefault();
if (arg.Kind != TypeKind.TypeParameter) {
var array = new ArrayType (ctx.Compilation, arg, 1);
wrapper.AddType(array, true);
}
}
} else {
var hint = wrapper.AddType(hintType, true);
if (hint != null) {
DefaultCompletionString = hint.DisplayText;
hint.CompletionCategory = derivedTypesCategory;
}
}
}
AddTypesAndNamespaces(wrapper, state, null, pred, m => false, typeCallback);
if (hintType == null || hintType == SpecialType.UnknownType) {
AddKeywords(wrapper, primitiveTypesKeywords.Where(k => k != "void"));
}
CloseOnSquareBrackets = true;
AutoCompleteEmptyMatch = true;
AutoCompleteEmptyMatchOnCurlyBracket = false;
return wrapper.Result;
}
void RunTypeInference(Candidate candidate)
{
if (candidate.TypeParameters == null) {
if (explicitlyGivenTypeArguments != null) {
// method does not expect type arguments, but was given some
candidate.AddError(OverloadResolutionErrors.WrongNumberOfTypeArguments);
}
// Grab new parameter types:
ResolveParameterTypes(candidate, true);
return;
}
ParameterizedType parameterizedDeclaringType = candidate.Member.DeclaringType as ParameterizedType;
IList<IType> classTypeArguments;
if (parameterizedDeclaringType != null) {
classTypeArguments = parameterizedDeclaringType.TypeArguments;
} else {
classTypeArguments = null;
}
// The method is generic:
if (explicitlyGivenTypeArguments != null) {
if (explicitlyGivenTypeArguments.Length == candidate.TypeParameters.Count) {
candidate.InferredTypes = explicitlyGivenTypeArguments;
} else {
candidate.AddError(OverloadResolutionErrors.WrongNumberOfTypeArguments);
// wrong number of type arguments given, so truncate the list or pad with UnknownType
candidate.InferredTypes = new IType[candidate.TypeParameters.Count];
for (int i = 0; i < candidate.InferredTypes.Length; i++) {
if (i < explicitlyGivenTypeArguments.Length)
candidate.InferredTypes[i] = explicitlyGivenTypeArguments[i];
else
candidate.InferredTypes[i] = SpecialType.UnknownType;
}
}
} else {
TypeInference ti = new TypeInference(compilation, conversions);
bool success;
candidate.InferredTypes = ti.InferTypeArguments(candidate.TypeParameters, arguments, candidate.ParameterTypes, out success, classTypeArguments);
if (!success)
candidate.AddError(OverloadResolutionErrors.TypeInferenceFailed);
}
// Now substitute in the formal parameters:
var substitution = new ConstraintValidatingSubstitution(classTypeArguments, candidate.InferredTypes, this);
for (int i = 0; i < candidate.ParameterTypes.Length; i++) {
candidate.ParameterTypes[i] = candidate.ParameterTypes[i].AcceptVisitor(substitution);
}
if (!substitution.ConstraintsValid)
candidate.AddError(OverloadResolutionErrors.ConstructedTypeDoesNotSatisfyConstraint);
}
public OccursInVisitor(TypeInference typeInference)
{
this.tp = typeInference.typeParameters;
this.Occurs = new bool[tp.Length];
}
public static IType GuessType(RefactoringContext context, AstNode expr)
{
if (expr is SimpleType && expr.Role == Roles.TypeArgument) {
if (expr.Parent is MemberReferenceExpression || expr.Parent is IdentifierExpression) {
var rr = context.Resolve (expr.Parent);
var argumentNumber = expr.Parent.GetChildrenByRole (Roles.TypeArgument).TakeWhile (c => c != expr).Count ();
var mgrr = rr as MethodGroupResolveResult;
if (mgrr != null && mgrr.Methods.Any () && mgrr.Methods.First ().TypeArguments.Count > argumentNumber)
return mgrr.Methods.First ().TypeParameters[argumentNumber];
} else if (expr.Parent is MemberType || expr.Parent is SimpleType) {
var rr = context.Resolve (expr.Parent);
var argumentNumber = expr.Parent.GetChildrenByRole (Roles.TypeArgument).TakeWhile (c => c != expr).Count ();
var mgrr = rr as TypeResolveResult;
if (mgrr != null && mgrr.Type.TypeParameterCount > argumentNumber) {
return mgrr.Type.GetDefinition ().TypeParameters[argumentNumber];
}
}
}
var type = GetValidTypes(context.Resolver, expr).ToArray();
var typeInference = new TypeInference(context.Compilation);
typeInference.Algorithm = TypeInferenceAlgorithm.Improved;
var inferedType = typeInference.FindTypeInBounds(type, emptyTypes);
return inferedType;
}
public static AstType GuessAstType(RefactoringContext context, AstNode expr)
{
var type = GetValidTypes(context.Resolver, expr).ToArray();
var typeInference = new TypeInference(context.Compilation);
typeInference.Algorithm = TypeInferenceAlgorithm.Improved;
var inferedType = typeInference.FindTypeInBounds(type, emptyTypes);
if (inferedType.Kind == TypeKind.Unknown)
return new PrimitiveType("object");
return context.CreateShortType(inferedType);
}
void RunTypeInference(Candidate candidate)
{
if (candidate.TypeParameters == null)
{
if (explicitlyGivenTypeArguments != null)
{
// method does not expect type arguments, but was given some
candidate.AddError(OverloadResolutionErrors.WrongNumberOfTypeArguments);
}
// Grab new parameter types:
ResolveParameterTypes(candidate, true);
return;
}
ParameterizedType parameterizedDeclaringType = candidate.Member.DeclaringType as ParameterizedType;
IList <IType> classTypeArguments;
if (parameterizedDeclaringType != null)
{
classTypeArguments = parameterizedDeclaringType.TypeArguments;
}
else
{
classTypeArguments = null;
}
// The method is generic:
if (explicitlyGivenTypeArguments != null)
{
if (explicitlyGivenTypeArguments.Length == candidate.TypeParameters.Count)
{
candidate.InferredTypes = explicitlyGivenTypeArguments;
}
else
{
candidate.AddError(OverloadResolutionErrors.WrongNumberOfTypeArguments);
// wrong number of type arguments given, so truncate the list or pad with UnknownType
candidate.InferredTypes = new IType[candidate.TypeParameters.Count];
for (int i = 0; i < candidate.InferredTypes.Length; i++)
{
if (i < explicitlyGivenTypeArguments.Length)
{
candidate.InferredTypes[i] = explicitlyGivenTypeArguments[i];
}
else
{
candidate.InferredTypes[i] = SpecialType.UnknownType;
}
}
}
}
else
{
TypeInference ti = new TypeInference(compilation, conversions);
bool success;
candidate.InferredTypes = ti.InferTypeArguments(candidate.TypeParameters, arguments, candidate.ParameterTypes, out success, classTypeArguments);
if (!success)
{
candidate.AddError(OverloadResolutionErrors.TypeInferenceFailed);
}
}
// Now substitute in the formal parameters:
var substitution = new ConstraintValidatingSubstitution(classTypeArguments, candidate.InferredTypes, this);
for (int i = 0; i < candidate.ParameterTypes.Length; i++)
{
candidate.ParameterTypes[i] = candidate.ParameterTypes[i].AcceptVisitor(substitution);
}
if (!substitution.ConstraintsValid)
{
candidate.AddError(OverloadResolutionErrors.ConstructedTypeDoesNotSatisfyConstraint);
}
}
/// <summary>
/// Resolves an array creation.
/// </summary>
/// <param name="elementType">
/// The array element type.
/// Pass null to resolve an implicitly-typed array creation.
/// </param>
/// <param name="sizeArguments">
/// The size arguments.
/// The length of this array will be used as the number of dimensions of the array type.
/// The resolver may mutate this array to wrap elements in <see cref="ConversionResolveResult"/>s!
/// </param>
/// <param name="initializerElements">
/// The initializer elements. May be null if no array initializer was specified.
/// The resolver may mutate this array to wrap elements in <see cref="ConversionResolveResult"/>s!
/// </param>
public ArrayCreateResolveResult ResolveArrayCreation(IType elementType, ResolveResult[] sizeArguments, ResolveResult[] initializerElements = null)
{
int dimensions = sizeArguments.Length;
if (dimensions == 0)
throw new ArgumentException("sizeArguments.Length must not be 0");
if (elementType == null) {
TypeInference typeInference = new TypeInference(compilation, conversions);
bool success;
elementType = typeInference.GetBestCommonType(initializerElements, out success);
}
IType arrayType = new ArrayType(compilation, elementType, dimensions);
AdjustArrayAccessArguments(sizeArguments);
if (initializerElements != null) {
for (int i = 0; i < initializerElements.Length; i++) {
initializerElements[i] = Convert(initializerElements[i], elementType);
}
}
return new ArrayCreateResolveResult(arrayType, sizeArguments, initializerElements);
}
static bool IsEligibleExtensionMethod(ICompilation compilation, CSharpConversions conversions, IType targetType, IMethod method, bool useTypeInference, out IType[] outInferredTypes)
{
outInferredTypes = null;
if (targetType == null)
return true;
if (method.Parameters.Count == 0)
return false;
IType thisParameterType = method.Parameters[0].Type;
if (useTypeInference && method.TypeParameters.Count > 0) {
// We need to infer type arguments from targetType:
TypeInference ti = new TypeInference(compilation, conversions);
ResolveResult[] arguments = { new ResolveResult(targetType) };
IType[] parameterTypes = { method.Parameters[0].Type };
bool success;
var inferredTypes = ti.InferTypeArguments(method.TypeParameters, arguments, parameterTypes, out success);
var substitution = new TypeParameterSubstitution(null, inferredTypes);
// Validate that the types that could be inferred (aren't unknown) satisfy the constraints:
bool hasInferredTypes = false;
for (int i = 0; i < inferredTypes.Length; i++) {
if (inferredTypes[i].Kind != TypeKind.Unknown && inferredTypes[i].Kind != TypeKind.UnboundTypeArgument) {
hasInferredTypes = true;
if (!OverloadResolution.ValidateConstraints(method.TypeParameters[i], inferredTypes[i], substitution, conversions))
return false;
} else {
inferredTypes[i] = method.TypeParameters[i]; // do not substitute types that could not be inferred
}
}
if (hasInferredTypes)
outInferredTypes = inferredTypes;
thisParameterType = thisParameterType.AcceptVisitor(substitution);
}
Conversion c = conversions.ImplicitConversion(targetType, thisParameterType);
return c.IsValid && (c.IsIdentityConversion || c.IsReferenceConversion || c.IsBoxingConversion);
}