2 // namespace.cs: Tracks namespaces
5 // Miguel de Icaza (miguel@ximian.com)
6 // Marek Safar (marek.safar@seznam.cz)
8 // Copyright 2001 Ximian, Inc.
9 // Copyright 2003-2008 Novell, Inc.
10 // Copyright 2011 Xamarin Inc
13 using System.Collections.Generic;
15 using Mono.CompilerServices.SymbolWriter;
17 namespace Mono.CSharp {
19 public class RootNamespace : Namespace {
21 readonly string alias_name;
22 readonly Dictionary<string, Namespace> all_namespaces;
24 public RootNamespace (string alias_name)
27 this.alias_name = alias_name;
28 RegisterNamespace (this);
30 all_namespaces = new Dictionary<string, Namespace> ();
31 all_namespaces.Add ("", this);
40 public static void Error_GlobalNamespaceRedefined (Report report, Location loc)
42 report.Error (1681, loc, "The global extern alias cannot be redefined");
46 // For better error reporting where we try to guess missing using directive
48 public List<string> FindTypeNamespaces (IMemberContext ctx, string name, int arity)
50 List<string> res = null;
52 foreach (var ns in all_namespaces) {
53 var type = ns.Value.LookupType (ctx, name, arity, LookupMode.Normal, Location.Null);
56 res = new List<string> ();
66 // For better error reporting where compiler tries to guess missing using directive
68 public List<string> FindExtensionMethodNamespaces (IMemberContext ctx, string name, int arity)
70 List<string> res = null;
72 foreach (var ns in all_namespaces) {
73 if (ns.Key.Length == 0)
76 var methods = ns.Value.LookupExtensionMethod (ctx, name, arity);
77 if (methods != null) {
79 res = new List<string> ();
88 public void RegisterNamespace (Namespace child)
91 all_namespaces.Add (child.Name, child);
94 public override string GetSignatureForError ()
96 return alias_name + "::";
100 public sealed class GlobalRootNamespace : RootNamespace
102 public GlobalRootNamespace ()
109 // Namespace cache for imported and compiled namespaces
111 public class Namespace
113 readonly Namespace parent;
115 protected Dictionary<string, Namespace> namespaces;
116 protected Dictionary<string, IList<TypeSpec>> types;
117 List<TypeSpec> extension_method_types;
118 Dictionary<string, TypeSpec> cached_types;
122 /// Constructor Takes the current namespace and the
123 /// name. This is bootstrapped with parent == null
126 public Namespace (Namespace parent, string name)
130 throw new ArgumentNullException ("name");
132 this.parent = parent;
134 string pname = parent != null ? parent.fullname : null;
139 fullname = pname + "." + name;
141 while (parent.parent != null)
142 parent = parent.parent;
144 var root = parent as RootNamespace;
146 throw new InternalErrorException ("Root namespaces must be created using RootNamespace");
148 root.RegisterNamespace (this);
151 protected Namespace ()
153 namespaces = new Dictionary<string, Namespace> ();
154 cached_types = new Dictionary<string, TypeSpec> ();
160 /// The qualified name of the current namespace
163 get { return fullname; }
167 /// The parent of this namespace, used by the parser to "Pop"
168 /// the current namespace declaration
170 public Namespace Parent {
171 get { return parent; }
176 public Namespace AddNamespace (MemberName name)
178 var ns_parent = name.Left == null ? this : AddNamespace (name.Left);
179 return ns_parent.TryAddNamespace (name.Basename);
182 Namespace TryAddNamespace (string name)
186 if (!namespaces.TryGetValue (name, out ns)) {
187 ns = new Namespace (this, name);
188 namespaces.Add (name, ns);
194 public bool TryGetNamespace (string name, out Namespace ns)
196 return namespaces.TryGetValue (name, out ns);
199 // TODO: Replace with CreateNamespace where MemberName is created for the method call
200 public Namespace GetNamespace (string name, bool create)
202 int pos = name.IndexOf ('.');
207 first = name.Substring (0, pos);
211 if (!namespaces.TryGetValue (first, out ns)) {
215 ns = new Namespace (this, first);
216 namespaces.Add (first, ns);
220 ns = ns.GetNamespace (name.Substring (pos + 1), create);
225 public IList<TypeSpec> GetAllTypes (string name)
227 IList<TypeSpec> found;
228 if (types == null || !types.TryGetValue (name, out found))
234 public virtual string GetSignatureForError ()
239 public TypeSpec LookupType (IMemberContext ctx, string name, int arity, LookupMode mode, Location loc)
244 TypeSpec best = null;
245 if (arity == 0 && cached_types.TryGetValue (name, out best)) {
246 if (best != null || mode != LookupMode.IgnoreAccessibility)
250 IList<TypeSpec> found;
251 if (!types.TryGetValue (name, out found))
254 foreach (var ts in found) {
255 if (ts.Arity == arity) {
257 if ((ts.Modifiers & Modifiers.INTERNAL) != 0 && !ts.MemberDefinition.IsInternalAsPublic (ctx.Module.DeclaringAssembly) && mode != LookupMode.IgnoreAccessibility)
264 if (best.MemberDefinition.IsImported && ts.MemberDefinition.IsImported) {
265 if (ts.Kind == MemberKind.MissingType)
268 if (best.Kind == MemberKind.MissingType) {
273 if (mode == LookupMode.Normal) {
274 ctx.Module.Compiler.Report.SymbolRelatedToPreviousError (best);
275 ctx.Module.Compiler.Report.SymbolRelatedToPreviousError (ts);
276 ctx.Module.Compiler.Report.Error (433, loc, "The imported type `{0}' is defined multiple times", ts.GetSignatureForError ());
282 if (best.MemberDefinition.IsImported)
285 if ((best.Modifiers & Modifiers.INTERNAL) != 0 && !best.MemberDefinition.IsInternalAsPublic (ctx.Module.DeclaringAssembly))
288 if (mode != LookupMode.Normal)
291 if (ts.MemberDefinition.IsImported) {
292 ctx.Module.Compiler.Report.SymbolRelatedToPreviousError (best);
293 ctx.Module.Compiler.Report.SymbolRelatedToPreviousError (ts);
296 ctx.Module.Compiler.Report.Warning (436, 2, loc,
297 "The type `{0}' conflicts with the imported type of same name'. Ignoring the imported type definition",
298 best.GetSignatureForError ());
302 // Lookup for the best candidate with the closest arity match
307 } else if (System.Math.Abs (ts.Arity + arity) < System.Math.Abs (best.Arity + arity)) {
313 // TODO MemberCache: Cache more
314 if (arity == 0 && mode == LookupMode.Normal)
315 cached_types.Add (name, best);
318 var dep = best.GetMissingDependencies ();
320 ImportedTypeDefinition.Error_MissingDependency (ctx, dep, loc);
326 public FullNamedExpression LookupTypeOrNamespace (IMemberContext ctx, string name, int arity, LookupMode mode, Location loc)
328 var texpr = LookupType (ctx, name, arity, mode, loc);
331 if (arity == 0 && namespaces.TryGetValue (name, out ns)) {
333 return new NamespaceExpression (ns, loc);
335 if (mode != LookupMode.Probing) {
336 //ctx.Module.Compiler.Report.SymbolRelatedToPreviousError (texpr.Type);
337 // ctx.Module.Compiler.Report.SymbolRelatedToPreviousError (ns.loc, "");
338 ctx.Module.Compiler.Report.Warning (437, 2, loc,
339 "The type `{0}' conflicts with the imported namespace `{1}'. Using the definition found in the source file",
340 texpr.GetSignatureForError (), ns.GetSignatureForError ());
343 if (texpr.MemberDefinition.IsImported)
344 return new NamespaceExpression (ns, loc);
350 return new TypeExpression (texpr, loc);
354 // Completes types with the given `prefix'
356 public IEnumerable<string> CompletionGetTypesStartingWith (string prefix)
359 return Enumerable.Empty<string> ();
361 var res = from item in types
362 where item.Key.StartsWith (prefix) && item.Value.Any (l => (l.Modifiers & Modifiers.PUBLIC) != 0)
365 if (namespaces != null)
366 res = res.Concat (from item in namespaces where item.Key.StartsWith (prefix) select item.Key);
372 // Looks for extension method in this namespace
374 public List<MethodSpec> LookupExtensionMethod (IMemberContext invocationContext, string name, int arity)
376 if (extension_method_types == null)
379 List<MethodSpec> found = null;
380 for (int i = 0; i < extension_method_types.Count; ++i) {
381 var ts = extension_method_types[i];
384 // When the list was built we didn't know what members the type
387 if ((ts.Modifiers & Modifiers.METHOD_EXTENSION) == 0) {
388 if (extension_method_types.Count == 1) {
389 extension_method_types = null;
393 extension_method_types.RemoveAt (i--);
397 var res = ts.MemberCache.FindExtensionMethods (invocationContext, name, arity);
404 found.AddRange (res);
411 public void AddType (ModuleContainer module, TypeSpec ts)
414 types = new Dictionary<string, IList<TypeSpec>> (64);
417 if (ts.IsClass && ts.Arity == 0) {
418 var extension_method_allowed = ts.MemberDefinition.IsImported ? (ts.Modifiers & Modifiers.METHOD_EXTENSION) != 0 : (ts.IsStatic || ts.MemberDefinition.IsPartial);
419 if (extension_method_allowed) {
420 if (extension_method_types == null)
421 extension_method_types = new List<TypeSpec> ();
423 extension_method_types.Add (ts);
428 IList<TypeSpec> existing;
429 if (types.TryGetValue (name, out existing)) {
430 TypeSpec better_type;
432 if (existing.Count == 1) {
434 if (ts.Arity == found.Arity) {
435 better_type = IsImportedTypeOverride (module, ts, found);
436 if (better_type == found)
439 if (better_type != null) {
440 existing [0] = better_type;
445 existing = new List<TypeSpec> ();
446 existing.Add (found);
447 types[name] = existing;
449 for (int i = 0; i < existing.Count; ++i) {
451 if (ts.Arity != found.Arity)
454 better_type = IsImportedTypeOverride (module, ts, found);
455 if (better_type == found)
458 if (better_type != null) {
459 existing.RemoveAt (i);
468 types.Add (name, new TypeSpec[] { ts });
473 // We import any types but in the situation there are same types
474 // but one has better visibility (either public or internal with friend)
475 // the less visible type is removed from the namespace cache
477 public static TypeSpec IsImportedTypeOverride (ModuleContainer module, TypeSpec ts, TypeSpec found)
479 var ts_accessible = (ts.Modifiers & Modifiers.PUBLIC) != 0 || ts.MemberDefinition.IsInternalAsPublic (module.DeclaringAssembly);
480 var found_accessible = (found.Modifiers & Modifiers.PUBLIC) != 0 || found.MemberDefinition.IsInternalAsPublic (module.DeclaringAssembly);
482 if (ts_accessible && !found_accessible)
485 // found is better always better for accessible or inaccessible ts
492 public void RemoveContainer (TypeContainer tc)
494 IList<TypeSpec> found;
495 if (types.TryGetValue (tc.MemberName.Name, out found)) {
496 for (int i = 0; i < found.Count; ++i) {
497 if (tc.MemberName.Arity != found [i].Arity)
500 if (found.Count == 1)
501 types.Remove (tc.MemberName.Name);
509 cached_types.Remove (tc.MemberName.Basename);
512 public void SetBuiltinType (BuiltinTypeSpec pts)
514 var found = types[pts.Name];
515 cached_types.Remove (pts.Name);
516 if (found.Count == 1) {
517 types[pts.Name][0] = pts;
519 throw new NotImplementedException ();
523 public void VerifyClsCompliance ()
525 if (types == null || cls_checked)
530 // TODO: This is quite ugly way to check for CLS compliance at namespace level
532 var locase_types = new Dictionary<string, List<TypeSpec>> (StringComparer.OrdinalIgnoreCase);
533 foreach (var tgroup in types.Values) {
534 foreach (var tm in tgroup) {
535 if ((tm.Modifiers & Modifiers.PUBLIC) == 0 || !tm.IsCLSCompliant ())
538 List<TypeSpec> found;
539 if (!locase_types.TryGetValue (tm.Name, out found)) {
540 found = new List<TypeSpec> ();
541 locase_types.Add (tm.Name, found);
548 foreach (var locase in locase_types.Values) {
549 if (locase.Count < 2)
552 bool all_same = true;
553 foreach (var notcompliant in locase) {
554 all_same = notcompliant.Name == locase[0].Name;
562 TypeContainer compiled = null;
563 foreach (var notcompliant in locase) {
564 if (!notcompliant.MemberDefinition.IsImported) {
565 if (compiled != null)
566 compiled.Compiler.Report.SymbolRelatedToPreviousError (compiled);
568 compiled = notcompliant.MemberDefinition as TypeContainer;
570 compiled.Compiler.Report.SymbolRelatedToPreviousError (notcompliant);
574 compiled.Compiler.Report.Warning (3005, 1, compiled.Location,
575 "Identifier `{0}' differing only in case is not CLS-compliant", compiled.GetSignatureForError ());
580 public class CompilationSourceFile : NamespaceContainer
582 readonly SourceFile file;
583 CompileUnitEntry comp_unit;
584 Dictionary<string, SourceFile> include_files;
585 Dictionary<string, bool> conditionals;
587 public CompilationSourceFile (ModuleContainer parent, SourceFile sourceFile)
590 this.file = sourceFile;
593 public CompilationSourceFile (ModuleContainer parent)
598 public CompileUnitEntry SymbolUnitEntry {
604 public string FileName {
610 public SourceFile SourceFile {
616 public void AddIncludeFile (SourceFile file)
618 if (file == this.file)
621 if (include_files == null)
622 include_files = new Dictionary<string, SourceFile> ();
624 if (!include_files.ContainsKey (file.FullPathName))
625 include_files.Add (file.FullPathName, file);
628 public void AddDefine (string value)
630 if (conditionals == null)
631 conditionals = new Dictionary<string, bool> (2);
633 conditionals[value] = true;
636 public void AddUndefine (string value)
638 if (conditionals == null)
639 conditionals = new Dictionary<string, bool> (2);
641 conditionals[value] = false;
644 public override void PrepareEmit ()
646 var sw = Module.DeclaringAssembly.SymbolWriter;
648 CreateUnitSymbolInfo (sw);
655 // Creates symbol file index in debug symbol file
657 void CreateUnitSymbolInfo (MonoSymbolFile symwriter)
659 var si = file.CreateSymbolInfo (symwriter);
660 comp_unit = new CompileUnitEntry (symwriter, si);
662 if (include_files != null) {
663 foreach (SourceFile include in include_files.Values) {
664 si = include.CreateSymbolInfo (symwriter);
665 comp_unit.AddFile (si);
670 public bool IsConditionalDefined (string value)
672 if (conditionals != null) {
674 if (conditionals.TryGetValue (value, out res))
677 // When conditional was undefined
678 if (conditionals.ContainsKey (value))
682 return Compiler.Settings.IsConditionalSymbolDefined (value);
685 public override void Accept (StructuralVisitor visitor)
687 visitor.Visit (this);
693 // Namespace block as created by the parser
695 public class NamespaceContainer : TypeContainer, IMemberContext
697 static readonly Namespace[] empty_namespaces = new Namespace[0];
699 readonly Namespace ns;
701 public new readonly NamespaceContainer Parent;
703 List<UsingNamespace> clauses;
705 // Used by parsed to check for parser errors
706 public bool DeclarationFound;
708 Namespace[] namespace_using_table;
709 TypeSpec[] types_using_table;
710 Dictionary<string, UsingAliasNamespace> aliases;
712 public NamespaceContainer (MemberName name, NamespaceContainer parent)
713 : base (parent, name, null, MemberKind.Namespace)
715 this.Parent = parent;
716 this.ns = parent.NS.AddNamespace (name);
718 containers = new List<TypeContainer> ();
721 protected NamespaceContainer (ModuleContainer parent)
722 : base (parent, null, null, MemberKind.Namespace)
724 ns = parent.GlobalRootNamespace;
725 containers = new List<TypeContainer> (2);
730 public override AttributeTargets AttributeTargets {
732 throw new NotSupportedException ();
736 public override string DocCommentHeader {
738 throw new NotSupportedException ();
742 public Namespace NS {
748 public List<UsingNamespace> Usings {
754 public override string[] ValidAttributeTargets {
756 throw new NotSupportedException ();
762 public void AddUsing (UsingNamespace un)
764 if (DeclarationFound){
765 Compiler.Report.Error (1529, un.Location, "A using clause must precede all other namespace elements except extern alias declarations");
769 clauses = new List<UsingNamespace> ();
774 public void AddUsing (UsingAliasNamespace un)
776 if (DeclarationFound){
777 Compiler.Report.Error (1529, un.Location, "A using clause must precede all other namespace elements except extern alias declarations");
783 void AddAlias (UsingAliasNamespace un)
785 if (clauses == null) {
786 clauses = new List<UsingNamespace> ();
788 foreach (var entry in clauses) {
789 var a = entry as UsingAliasNamespace;
790 if (a != null && a.Alias.Value == un.Alias.Value) {
791 Compiler.Report.SymbolRelatedToPreviousError (a.Location, "");
792 Compiler.Report.Error (1537, un.Location,
793 "The using alias `{0}' appeared previously in this namespace", un.Alias.Value);
801 public override void AddPartial (TypeDefinition next_part)
803 var existing = ns.LookupType (this, next_part.MemberName.Name, next_part.MemberName.Arity, LookupMode.Probing, Location.Null);
804 var td = existing != null ? existing.MemberDefinition as TypeDefinition : null;
805 AddPartial (next_part, td);
808 public override void AddTypeContainer (TypeContainer tc)
810 var mn = tc.MemberName;
811 var name = mn.Basename;
812 while (mn.Left != null) {
817 var names_container = Parent == null ? Module : (TypeContainer) this;
820 if (names_container.DefinedNames.TryGetValue (name, out mc)) {
821 if (tc is NamespaceContainer && mc is NamespaceContainer) {
822 AddTypeContainerMember (tc);
826 Report.SymbolRelatedToPreviousError (mc);
827 if ((mc.ModFlags & Modifiers.PARTIAL) != 0 && (tc is ClassOrStruct || tc is Interface)) {
828 Error_MissingPartialModifier (tc);
830 Report.Error (101, tc.Location, "The namespace `{0}' already contains a definition for `{1}'",
831 GetSignatureForError (), mn.GetSignatureForError ());
834 names_container.DefinedNames.Add (name, tc);
836 var tdef = tc.PartialContainer;
839 // Same name conflict in different namespace containers
841 var conflict = ns.GetAllTypes (name);
842 if (conflict != null) {
843 foreach (var e in conflict) {
844 if (e.Arity == mn.Arity) {
845 mc = (MemberCore) e.MemberDefinition;
852 Report.SymbolRelatedToPreviousError (mc);
853 Report.Error (101, tc.Location, "The namespace `{0}' already contains a definition for `{1}'",
854 GetSignatureForError (), mn.GetSignatureForError ());
856 ns.AddType (Module, tdef.Definition);
861 base.AddTypeContainer (tc);
864 public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
866 throw new NotSupportedException ();
869 public override void EmitContainer ()
871 VerifyClsCompliance ();
873 base.EmitContainer ();
876 public ExtensionMethodCandidates LookupExtensionMethod (IMemberContext invocationContext, string name, int arity, int position)
879 // Here we try to resume the search for extension method at the point
880 // where the last bunch of candidates was found. It's more tricky than
881 // it seems as we have to check both namespace containers and namespace
889 // <our first search found candidates in A.B.C.D
893 // In the example above namespace A.B.C.D, A.B.C and A.B have to be
894 // checked before we hit A.N1 using
896 ExtensionMethodCandidates candidates;
897 var container = this;
899 candidates = container.LookupExtensionMethodCandidates (invocationContext, name, arity, ref position);
900 if (candidates != null || container.MemberName == null)
903 var container_ns = container.ns.Parent;
904 var mn = container.MemberName.Left;
905 int already_checked = position - 2;
906 while (already_checked-- > 0) {
908 container_ns = container_ns.Parent;
914 var methods = container_ns.LookupExtensionMethod (invocationContext, name, arity);
915 if (methods != null) {
916 return new ExtensionMethodCandidates (invocationContext, methods, container, position);
920 container_ns = container_ns.Parent;
924 container = container.Parent;
925 } while (container != null);
930 ExtensionMethodCandidates LookupExtensionMethodCandidates (IMemberContext invocationContext, string name, int arity, ref int position)
932 List<MethodSpec> candidates = null;
937 candidates = ns.LookupExtensionMethod (invocationContext, name, arity);
938 if (candidates != null) {
939 return new ExtensionMethodCandidates (invocationContext, candidates, this, position);
946 foreach (Namespace n in namespace_using_table) {
947 var a = n.LookupExtensionMethod (invocationContext, name, arity);
951 if (candidates == null)
954 candidates.AddRange (a);
957 if (types_using_table != null) {
958 foreach (var t in types_using_table) {
960 var res = t.MemberCache.FindExtensionMethods (invocationContext, name, arity);
964 if (candidates == null)
967 candidates.AddRange (res);
971 if (candidates != null)
972 return new ExtensionMethodCandidates (invocationContext, candidates, this, position);
978 public override FullNamedExpression LookupNamespaceOrType (string name, int arity, LookupMode mode, Location loc)
981 // Only simple names (no dots) will be looked up with this function
983 FullNamedExpression resolved;
984 for (NamespaceContainer container = this; container != null; container = container.Parent) {
985 resolved = container.Lookup (name, arity, mode, loc);
986 if (resolved != null || container.MemberName == null)
989 var container_ns = container.ns.Parent;
990 var mn = container.MemberName.Left;
992 resolved = container_ns.LookupTypeOrNamespace (this, name, arity, mode, loc);
993 if (resolved != null)
997 container_ns = container_ns.Parent;
1004 public override void GetCompletionStartingWith (string prefix, List<string> results)
1009 foreach (var un in Usings) {
1010 if (un.Alias != null)
1013 var name = un.NamespaceExpression.Name;
1014 if (name.StartsWith (prefix))
1019 IEnumerable<string> all = Enumerable.Empty<string> ();
1021 foreach (Namespace using_ns in namespace_using_table) {
1022 if (prefix.StartsWith (using_ns.Name)) {
1023 int ld = prefix.LastIndexOf ('.');
1025 string rest = prefix.Substring (ld + 1);
1027 all = all.Concat (using_ns.CompletionGetTypesStartingWith (rest));
1030 all = all.Concat (using_ns.CompletionGetTypesStartingWith (prefix));
1033 results.AddRange (all);
1035 base.GetCompletionStartingWith (prefix, results);
1040 // Looks-up a alias named @name in this and surrounding namespace declarations
1042 public FullNamedExpression LookupExternAlias (string name)
1044 if (aliases == null)
1047 UsingAliasNamespace uan;
1048 if (aliases.TryGetValue (name, out uan) && uan is UsingExternAlias)
1049 return uan.ResolvedExpression;
1055 // Looks-up a alias named @name in this and surrounding namespace declarations
1057 public override FullNamedExpression LookupNamespaceAlias (string name)
1059 for (NamespaceContainer n = this; n != null; n = n.Parent) {
1060 if (n.aliases == null)
1063 UsingAliasNamespace uan;
1064 if (n.aliases.TryGetValue (name, out uan))
1065 return uan.ResolvedExpression;
1071 FullNamedExpression Lookup (string name, int arity, LookupMode mode, Location loc)
1074 // Check whether it's in the namespace.
1076 FullNamedExpression fne = ns.LookupTypeOrNamespace (this, name, arity, mode, loc);
1081 if (aliases != null && arity == 0) {
1082 UsingAliasNamespace uan;
1083 if (aliases.TryGetValue (name, out uan)) {
1084 if (fne != null && mode != LookupMode.Probing) {
1085 // TODO: Namespace has broken location
1086 //Report.SymbolRelatedToPreviousError (fne.Location, null);
1087 Compiler.Report.SymbolRelatedToPreviousError (uan.Location, null);
1088 Compiler.Report.Error (576, loc,
1089 "Namespace `{0}' contains a definition with same name as alias `{1}'",
1090 GetSignatureForError (), name);
1093 return uan.ResolvedExpression;
1101 // Lookup can be called before the namespace is defined from different namespace using alias clause
1103 if (namespace_using_table == null) {
1104 DoDefineNamespace ();
1108 // Check using entries.
1110 FullNamedExpression match = null;
1111 foreach (Namespace using_ns in namespace_using_table) {
1113 // A using directive imports only types contained in the namespace, it
1114 // does not import any nested namespaces
1116 var t = using_ns.LookupType (this, name, arity, mode, loc);
1120 fne = new TypeExpression (t, loc);
1121 if (match == null) {
1126 // Prefer types over namespaces
1127 var texpr_fne = fne as TypeExpr;
1128 var texpr_match = match as TypeExpr;
1129 if (texpr_fne != null && texpr_match == null) {
1132 } else if (texpr_fne == null) {
1136 // It can be top level accessibility only
1137 var better = Namespace.IsImportedTypeOverride (Module, texpr_match.Type, texpr_fne.Type);
1138 if (better == null) {
1139 if (mode == LookupMode.Normal) {
1140 Compiler.Report.SymbolRelatedToPreviousError (texpr_match.Type);
1141 Compiler.Report.SymbolRelatedToPreviousError (texpr_fne.Type);
1142 Compiler.Report.Error (104, loc, "`{0}' is an ambiguous reference between `{1}' and `{2}'",
1143 name, texpr_match.GetSignatureForError (), texpr_fne.GetSignatureForError ());
1149 if (better == texpr_fne.Type)
1156 public static MethodGroupExpr LookupStaticUsings (IMemberContext mc, string name, int arity, Location loc)
1158 for (var m = mc.CurrentMemberDefinition; m != null; m = m.Parent) {
1160 var nc = m as NamespaceContainer;
1164 List<MemberSpec> candidates = null;
1165 if (nc.types_using_table != null) {
1166 foreach (var using_type in nc.types_using_table) {
1167 var members = MemberCache.FindMembers (using_type, name, true);
1168 if (members != null) {
1169 foreach (var member in members) {
1170 if ((member.Modifiers & Modifiers.METHOD_EXTENSION) != 0)
1173 if (arity > 0 && member.Arity != arity)
1176 if (candidates == null)
1177 candidates = new List<MemberSpec> ();
1179 candidates.Add (member);
1185 if (candidates != null)
1186 return new MethodGroupExpr (candidates, null, loc);
1192 protected override void DefineNamespace ()
1194 if (namespace_using_table == null)
1195 DoDefineNamespace ();
1197 base.DefineNamespace ();
1200 void DoDefineNamespace ()
1202 namespace_using_table = empty_namespaces;
1204 if (clauses != null) {
1205 List<Namespace> namespaces = null;
1206 List<TypeSpec> types = null;
1208 bool post_process_using_aliases = false;
1210 for (int i = 0; i < clauses.Count; ++i) {
1211 var entry = clauses[i];
1213 if (entry.Alias != null) {
1214 if (aliases == null)
1215 aliases = new Dictionary<string, UsingAliasNamespace> ();
1218 // Aliases are not available when resolving using section
1219 // except extern aliases
1221 if (entry is UsingExternAlias) {
1222 entry.Define (this);
1223 if (entry.ResolvedExpression != null)
1224 aliases.Add (entry.Alias.Value, (UsingExternAlias) entry);
1226 clauses.RemoveAt (i--);
1228 post_process_using_aliases = true;
1234 entry.Define (this);
1237 // It's needed for repl only, when using clause cannot be resolved don't hold it in
1238 // global list which is resolved for each evaluation
1240 if (entry.ResolvedExpression == null) {
1241 clauses.RemoveAt (i--);
1245 var using_ns = entry.ResolvedExpression as NamespaceExpression;
1246 if (using_ns == null) {
1248 var type = ((TypeExpr)entry.ResolvedExpression).Type;
1251 types = new List<TypeSpec> ();
1253 if (types.Contains (type)) {
1254 Warning_DuplicateEntry (entry);
1259 if (namespaces == null)
1260 namespaces = new List<Namespace> ();
1262 if (namespaces.Contains (using_ns.Namespace)) {
1263 // Ensure we don't report the warning multiple times in repl
1264 clauses.RemoveAt (i--);
1266 Warning_DuplicateEntry (entry);
1268 namespaces.Add (using_ns.Namespace);
1273 namespace_using_table = namespaces == null ? new Namespace [0] : namespaces.ToArray ();
1275 types_using_table = types.ToArray ();
1277 if (post_process_using_aliases) {
1278 for (int i = 0; i < clauses.Count; ++i) {
1279 var entry = clauses[i];
1280 if (entry.Alias != null) {
1281 entry.Define (this);
1282 if (entry.ResolvedExpression != null) {
1283 aliases.Add (entry.Alias.Value, (UsingAliasNamespace) entry);
1286 clauses.RemoveAt (i--);
1293 public void EnableRedefinition ()
1296 namespace_using_table = null;
1299 internal override void GenerateDocComment (DocumentationBuilder builder)
1301 if (containers != null) {
1302 foreach (var tc in containers)
1303 tc.GenerateDocComment (builder);
1307 public override string GetSignatureForError ()
1309 return MemberName == null ? "global::" : base.GetSignatureForError ();
1312 public override void RemoveContainer (TypeContainer cont)
1314 base.RemoveContainer (cont);
1315 NS.RemoveContainer (cont);
1318 protected override bool VerifyClsCompliance ()
1320 if (Module.IsClsComplianceRequired ()) {
1321 if (MemberName != null && MemberName.Name[0] == '_') {
1322 Warning_IdentifierNotCompliant ();
1325 ns.VerifyClsCompliance ();
1332 void Warning_DuplicateEntry (UsingNamespace entry)
1334 Compiler.Report.Warning (105, 3, entry.Location,
1335 "The using directive for `{0}' appeared previously in this namespace",
1336 entry.ResolvedExpression.GetSignatureForError ());
1339 public override void Accept (StructuralVisitor visitor)
1341 visitor.Visit (this);
1345 public class UsingNamespace
1347 readonly ATypeNameExpression expr;
1348 readonly Location loc;
1349 protected FullNamedExpression resolved;
1351 public UsingNamespace (ATypeNameExpression expr, Location loc)
1359 public virtual SimpleMemberName Alias {
1365 public Location Location {
1371 public ATypeNameExpression NamespaceExpression {
1377 public FullNamedExpression ResolvedExpression {
1385 public string GetSignatureForError ()
1387 return expr.GetSignatureForError ();
1390 public virtual void Define (NamespaceContainer ctx)
1392 resolved = expr.ResolveAsTypeOrNamespace (ctx, false);
1393 var ns = resolved as NamespaceExpression;
1397 if (resolved != null) {
1398 var compiler = ctx.Module.Compiler;
1399 var type = resolved.Type;
1400 if (compiler.Settings.Version >= LanguageVersion.V_6) {
1401 if (!type.IsClass || !type.IsStatic) {
1402 compiler.Report.SymbolRelatedToPreviousError (type);
1403 compiler.Report.Error (7007, Location,
1404 "`{0}' is not a static class. A using namespace directive can only be applied to static classes or namespace",
1405 GetSignatureForError ());
1411 compiler.Report.SymbolRelatedToPreviousError (type);
1412 compiler.Report.Error (138, Location,
1413 "`{0}' is a type not a namespace. A using namespace directive can only be applied to namespaces",
1414 GetSignatureForError ());
1418 public override string ToString()
1420 return resolved.ToString();
1424 public class UsingExternAlias : UsingAliasNamespace
1426 public UsingExternAlias (SimpleMemberName alias, Location loc)
1427 : base (alias, null, loc)
1431 public override void Define (NamespaceContainer ctx)
1433 var ns = ctx.Module.GetRootNamespace (Alias.Value);
1435 ctx.Module.Compiler.Report.Error (430, Location,
1436 "The extern alias `{0}' was not specified in -reference option",
1441 resolved = new NamespaceExpression (ns, Location);
1445 public class UsingAliasNamespace : UsingNamespace
1447 readonly SimpleMemberName alias;
1449 public struct AliasContext : IMemberContext
1451 readonly NamespaceContainer ns;
1453 public AliasContext (NamespaceContainer ns)
1458 public TypeSpec CurrentType {
1464 public TypeParameters CurrentTypeParameters {
1470 public MemberCore CurrentMemberDefinition {
1476 public bool IsObsolete {
1482 public bool IsUnsafe {
1484 throw new NotImplementedException ();
1488 public bool IsStatic {
1490 throw new NotImplementedException ();
1494 public ModuleContainer Module {
1500 public string GetSignatureForError ()
1502 throw new NotImplementedException ();
1505 public ExtensionMethodCandidates LookupExtensionMethod (string name, int arity)
1510 public FullNamedExpression LookupNamespaceOrType (string name, int arity, LookupMode mode, Location loc)
1512 var fne = ns.NS.LookupTypeOrNamespace (ns, name, arity, mode, loc);
1517 // Only extern aliases are allowed in this context
1519 fne = ns.LookupExternAlias (name);
1520 if (fne != null || ns.MemberName == null)
1523 var container_ns = ns.NS.Parent;
1524 var mn = ns.MemberName.Left;
1525 while (mn != null) {
1526 fne = container_ns.LookupTypeOrNamespace (this, name, arity, mode, loc);
1531 container_ns = container_ns.Parent;
1534 if (ns.Parent != null)
1535 return ns.Parent.LookupNamespaceOrType (name, arity, mode, loc);
1540 public FullNamedExpression LookupNamespaceAlias (string name)
1542 return ns.LookupNamespaceAlias (name);
1546 public UsingAliasNamespace (SimpleMemberName alias, ATypeNameExpression expr, Location loc)
1552 public override SimpleMemberName Alias {
1558 public override void Define (NamespaceContainer ctx)
1561 // The namespace-or-type-name of a using-alias-directive is resolved as if
1562 // the immediately containing compilation unit or namespace body had no
1563 // using-directives. A using-alias-directive may however be affected
1564 // by extern-alias-directives in the immediately containing compilation
1565 // unit or namespace body
1567 // We achieve that by introducing alias-context which redirect any local
1568 // namespace or type resolve calls to parent namespace
1570 resolved = NamespaceExpression.ResolveAsTypeOrNamespace (new AliasContext (ctx), false);