//
// If member is a virtual member that implicitly overrides a member in a base class, return the overridden member.
// Otherwise, return null.
//
// - MethodImpls ignored. (I didn't say it made sense, this is just how the desktop api we're porting behaves.)
// - Implemented interfaces ignores. (I didn't say it made sense, this is just how the desktop api we're porting behaves.)
//
public static M GetImplicitlyOverriddenBaseClassMember <M>(this M member) where M : MemberInfo
{
MemberPolicies <M> policies = MemberPolicies <M> .Default;
MethodAttributes visibility;
bool isStatic;
bool isVirtual;
bool isNewSlot;
policies.GetMemberAttributes(member, out visibility, out isStatic, out isVirtual, out isNewSlot);
if (isNewSlot || !isVirtual)
{
return(null);
}
String name = member.Name;
TypeInfo typeInfo = member.DeclaringType.GetTypeInfo();
for (;;)
{
Type baseType = typeInfo.BaseType;
if (baseType == null)
{
return(null);
}
typeInfo = baseType.GetTypeInfo();
foreach (M candidate in policies.GetDeclaredMembers(typeInfo))
{
if (candidate.Name != name)
{
continue;
}
MethodAttributes candidateVisibility;
bool isCandidateStatic;
bool isCandidateVirtual;
bool isCandidateNewSlot;
policies.GetMemberAttributes(member, out candidateVisibility, out isCandidateStatic, out isCandidateVirtual, out isCandidateNewSlot);
if (!isCandidateVirtual)
{
continue;
}
if (!policies.ImplicitlyOverrides(candidate, member))
{
continue;
}
return(candidate);
}
}
}
//
// Take the result of Stage1Filter and filter by the BindingFlag bits.
//
private static IEnumerable <M> Stage2Filter <M>(Type type, String optionalNameFilter, BindingFlags bindingFlags, bool allowPrefixing) where M : MemberInfo
{
MemberPolicies <M> policies = MemberPolicies <M> .Default;
bindingFlags = policies.ModifyBindingFlags(bindingFlags);
bool ignoreCase = (bindingFlags & BindingFlags.IgnoreCase) != 0;
bool declaredOnly = (bindingFlags & BindingFlags.DeclaredOnly) != 0;
QueriedMemberList <M> queriedMembers = Stage1Filter <M>(type, optionalNameFilter, ignoreCase: ignoreCase, declaredOnly: declaredOnly, allowPrefixing: allowPrefixing);
for (int i = 0; i < queriedMembers.Count; i++)
{
BindingFlags allFlagsThatMustMatch = queriedMembers.AllFlagsThatMustMatchNoCopy[i];
if ((bindingFlags & allFlagsThatMustMatch) == allFlagsThatMustMatch)
{
yield return(queriedMembers.MembersNoCopy[i]);
}
}
}
/// <summary>
/// Returns a single member, null or throws AmbigousMatchException, for the Type.Get*(string name,...) family of apis.
/// </summary>
public M?Disambiguate()
{
if (_queriedMembers == null)
{
return(null); // This is an uninitialized QueryResult<M>, which is supported and represents a 0-length list of matches.
}
int unfilteredCount = UnfilteredCount;
M?match = null;
for (int i = 0; i < unfilteredCount; i++)
{
if (_queriedMembers.Matches(i, _bindingAttr))
{
if (match != null)
{
M challenger = _queriedMembers[i];
// Assuming the policy says it's ok to ignore the ambiguity, we're to resolve in favor of the member
// declared by the most derived type. Since QueriedMemberLists are sorted in order of decreasing derivation,
// that means we let the first match win - unless, of course, they're both the "most derived member".
if (match.DeclaringType !.Equals(challenger.DeclaringType))
{
throw new AmbiguousMatchException();
}
MemberPolicies <M> policies = MemberPolicies <M> .Default;
if (!policies.OkToIgnoreAmbiguity(match, challenger))
{
throw new AmbiguousMatchException();
}
}
else
{
match = _queriedMembers[i];
}
}
}
return(match);
}
//
// Filter by name and visibility from the ReflectedType.
//
public static QueriedMemberList <M> Create(RuntimeTypeInfo type, string filter, bool ignoreCase, bool immediateTypeOnly)
{
RuntimeTypeInfo reflectedType = type;
MemberPolicies <M> policies = MemberPolicies <M> .Default;
NameFilter nameFilter;
if (filter == null)
{
nameFilter = null;
}
else if (ignoreCase)
{
nameFilter = new NameFilterCaseInsensitive(filter);
}
else
{
nameFilter = new NameFilterCaseSensitive(filter);
}
bool inBaseClass = false;
QueriedMemberList <M> queriedMembers = new QueriedMemberList <M>(immediateTypeOnly);
while (type != null)
{
int numCandidatesInDerivedTypes = queriedMembers._totalCount;
foreach (M member in policies.CoreGetDeclaredMembers(type, nameFilter, reflectedType))
{
policies.GetMemberAttributes(member, out MethodAttributes visibility, out bool isStatic, out bool isVirtual, out bool isNewSlot);
if (inBaseClass && visibility == MethodAttributes.Private)
{
continue;
}
if (numCandidatesInDerivedTypes != 0 && policies.IsSuppressedByMoreDerivedMember(member, queriedMembers._members, startIndex: 0, endIndex: numCandidatesInDerivedTypes))
{
continue;
}
BindingFlags allFlagsThatMustMatch = default;
allFlagsThatMustMatch |= (isStatic ? BindingFlags.Static : BindingFlags.Instance);
if (isStatic && inBaseClass)
{
allFlagsThatMustMatch |= BindingFlags.FlattenHierarchy;
}
allFlagsThatMustMatch |= ((visibility == MethodAttributes.Public) ? BindingFlags.Public : BindingFlags.NonPublic);
queriedMembers.Add(member, allFlagsThatMustMatch);
}
if (!inBaseClass)
{
queriedMembers._declaredOnlyCount = queriedMembers._totalCount;
if (immediateTypeOnly)
{
break;
}
if (policies.AlwaysTreatAsDeclaredOnly)
{
break;
}
inBaseClass = true;
}
type = type.BaseType.CastToRuntimeTypeInfo();
if (type != null && !type.CanBrowseWithoutMissingMetadataExceptions())
{
// If we got here, one of the base classes is missing metadata. We don't want to throw a MissingMetadataException now because we may be
// building a cached result for a caller who passed BindingFlags.DeclaredOnly. So we'll mark the results in a way that
// it will throw a MissingMetadataException if a caller attempts to iterate past the declared-only subset.
queriedMembers._typeThatBlockedBrowsing = type;
queriedMembers._totalCount = queriedMembers._declaredOnlyCount;
break;
}
}
return(queriedMembers);
}
//
// Filter by name and visibility from the ReflectedType.
//
public static QueriedMemberList <M> Create(RuntimeTypeInfo type, string optionalNameFilter, bool ignoreCase)
{
RuntimeTypeInfo reflectedType = type;
MemberPolicies <M> policies = MemberPolicies <M> .Default;
NameFilter?nameFilter;
if (optionalNameFilter == null)
{
nameFilter = null;
}
else if (ignoreCase)
{
nameFilter = new NameFilterCaseInsensitive(optionalNameFilter);
}
else
{
nameFilter = new NameFilterCaseSensitive(optionalNameFilter);
}
bool inBaseClass = false;
QueriedMemberList <M> queriedMembers = new QueriedMemberList <M>();
while (type != null)
{
int numCandidatesInDerivedTypes = queriedMembers._totalCount;
foreach (M member in policies.CoreGetDeclaredMembers(type, nameFilter, reflectedType))
{
MethodAttributes visibility;
bool isStatic;
bool isVirtual;
bool isNewSlot;
policies.GetMemberAttributes(member, out visibility, out isStatic, out isVirtual, out isNewSlot);
if (inBaseClass && visibility == MethodAttributes.Private)
{
continue;
}
if (numCandidatesInDerivedTypes != 0 && policies.IsSuppressedByMoreDerivedMember(member, queriedMembers._members, startIndex: 0, endIndex: numCandidatesInDerivedTypes))
{
continue;
}
BindingFlags allFlagsThatMustMatch = default(BindingFlags);
allFlagsThatMustMatch |= (isStatic ? BindingFlags.Static : BindingFlags.Instance);
if (isStatic && inBaseClass)
{
allFlagsThatMustMatch |= BindingFlags.FlattenHierarchy;
}
allFlagsThatMustMatch |= ((visibility == MethodAttributes.Public) ? BindingFlags.Public : BindingFlags.NonPublic);
queriedMembers.Add(member, allFlagsThatMustMatch);
}
if (!inBaseClass)
{
queriedMembers._declaredOnlyCount = queriedMembers._totalCount;
if (policies.AlwaysTreatAsDeclaredOnly)
{
break;
}
inBaseClass = true;
}
type = type.BaseType.CastToRuntimeTypeInfo();
}
return(queriedMembers);
}
//
// Filter by name and visibility from the ReflectedType.
//
private static QueriedMemberList <M> Stage1Filter <M>(Type type, String optionalNameFilter, bool ignoreCase, bool declaredOnly, bool allowPrefixing) where M : MemberInfo
{
Type reflectedType = type;
MemberPolicies <M> policies = MemberPolicies <M> .Default;
StringComparison comparisonType = ignoreCase ? StringComparison.CurrentCultureIgnoreCase : StringComparison.CurrentCulture;
bool inBaseClass = false;
bool nameFilterIsPrefix = false;
if (allowPrefixing && optionalNameFilter != null && optionalNameFilter.EndsWith("*", StringComparison.Ordinal))
{
nameFilterIsPrefix = true;
optionalNameFilter = optionalNameFilter.Substring(0, optionalNameFilter.Length - 1);
}
QueriedMemberList <M> queriedMembers = new QueriedMemberList <M>();
while (type != null)
{
int numCandidatesInDerivedTypes = queriedMembers.Count;
TypeInfo typeInfo = type.GetTypeInfo();
foreach (M member in policies.GetDeclaredMembers(typeInfo))
{
if (optionalNameFilter != null)
{
if (nameFilterIsPrefix)
{
if (!member.Name.StartsWith(optionalNameFilter, comparisonType))
{
continue;
}
}
else if (!member.Name.Equals(optionalNameFilter, comparisonType))
{
continue;
}
}
MethodAttributes visibility;
bool isStatic;
bool isVirtual;
bool isNewSlot;
policies.GetMemberAttributes(member, out visibility, out isStatic, out isVirtual, out isNewSlot);
if (inBaseClass && visibility == MethodAttributes.Private)
{
continue;
}
if (numCandidatesInDerivedTypes != 0 && policies.IsSuppressedByMoreDerivedMember(member, queriedMembers.MembersNoCopy, startIndex: 0, endIndex: numCandidatesInDerivedTypes))
{
continue;
}
BindingFlags allFlagsThatMustMatch = (BindingFlags)0;
allFlagsThatMustMatch |= (isStatic ? BindingFlags.Static : BindingFlags.Instance);
if (isStatic && inBaseClass)
{
allFlagsThatMustMatch |= BindingFlags.FlattenHierarchy;
}
allFlagsThatMustMatch |= ((visibility == MethodAttributes.Public) ? BindingFlags.Public : BindingFlags.NonPublic);
if (inBaseClass)
{
queriedMembers.Add(policies.GetInheritedMemberInfo(member, reflectedType), allFlagsThatMustMatch);
}
else
{
queriedMembers.Add(member, allFlagsThatMustMatch);
}
}
if (declaredOnly)
{
break;
}
inBaseClass = true;
type = typeInfo.BaseType;
}
return(queriedMembers);
}
