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)
25 : base (null, String.Empty)
27 this.alias_name = alias_name;
29 all_namespaces = new Dictionary<string, Namespace> ();
30 all_namespaces.Add ("", this);
39 public static void Error_GlobalNamespaceRedefined (Report report, Location loc)
41 report.Error (1681, loc, "The global extern alias cannot be redefined");
45 // For better error reporting where we try to guess missing using directive
47 public List<string> FindTypeNamespaces (IMemberContext ctx, string name, int arity)
49 List<string> res = null;
51 foreach (var ns in all_namespaces) {
52 var type = ns.Value.LookupType (ctx, name, arity, LookupMode.Normal, Location.Null);
55 res = new List<string> ();
65 // For better error reporting where compiler tries to guess missing using directive
67 public List<string> FindExtensionMethodNamespaces (IMemberContext ctx, TypeSpec extensionType, string name, int arity)
69 List<string> res = null;
71 foreach (var ns in all_namespaces) {
72 var methods = ns.Value.LookupExtensionMethod (ctx, extensionType, name, arity);
73 if (methods != null) {
75 res = new List<string> ();
84 public void RegisterNamespace (Namespace child)
87 all_namespaces.Add (child.Name, child);
90 public bool IsNamespace (string name)
92 return all_namespaces.ContainsKey (name);
95 protected void RegisterNamespace (string dotted_name)
97 if (dotted_name != null && dotted_name.Length != 0 && ! IsNamespace (dotted_name))
98 GetNamespace (dotted_name, true);
101 public override string GetSignatureForError ()
103 return alias_name + "::";
107 public class GlobalRootNamespace : RootNamespace
109 public GlobalRootNamespace ()
116 // Namespace cache for imported and compiled namespaces
118 // This is an Expression to allow it to be referenced in the
119 // compiler parse/intermediate tree during name resolution.
121 public class Namespace : FullNamedExpression
125 protected Dictionary<string, Namespace> namespaces;
126 protected Dictionary<string, IList<TypeSpec>> types;
127 List<TypeSpec> extension_method_types;
128 Dictionary<string, TypeExpr> cached_types;
132 public readonly MemberName MemberName;
135 /// Constructor Takes the current namespace and the
136 /// name. This is bootstrapped with parent == null
139 public Namespace (Namespace parent, string name)
141 // Expression members.
142 this.eclass = ExprClass.Namespace;
143 this.Type = InternalType.Namespace;
144 this.loc = Location.Null;
146 this.parent = parent;
149 this.root = parent.root;
151 this.root = this as RootNamespace;
153 if (this.root == null)
154 throw new InternalErrorException ("Root namespaces must be created using RootNamespace");
156 string pname = parent != null ? parent.fullname : "";
161 fullname = parent.fullname + "." + name;
163 if (fullname == null)
164 throw new InternalErrorException ("Namespace has a null fullname");
166 if (parent != null && parent.MemberName != MemberName.Null)
167 MemberName = new MemberName (parent.MemberName, name, Location.Null);
168 else if (name.Length == 0)
169 MemberName = MemberName.Null;
171 MemberName = new MemberName (name, Location.Null);
173 namespaces = new Dictionary<string, Namespace> ();
174 cached_types = new Dictionary<string, TypeExpr> ();
176 root.RegisterNamespace (this);
182 /// The qualified name of the current namespace
185 get { return fullname; }
189 /// The parent of this namespace, used by the parser to "Pop"
190 /// the current namespace declaration
192 public Namespace Parent {
193 get { return parent; }
198 protected override Expression DoResolve (ResolveContext ec)
203 public void Error_NamespaceDoesNotExist (IMemberContext ctx, string name, int arity, Location loc)
205 var retval = LookupType (ctx, name, arity, LookupMode.IgnoreAccessibility, loc);
206 if (retval != null) {
207 ctx.Module.Compiler.Report.SymbolRelatedToPreviousError (retval.Type);
208 ErrorIsInaccesible (ctx, retval.GetSignatureForError (), loc);
212 retval = LookupType (ctx, name, -System.Math.Max (1, arity), LookupMode.Probing, loc);
213 if (retval != null) {
214 Error_TypeArgumentsCannotBeUsed (ctx, retval.Type, arity, loc);
219 if (arity > 0 && namespaces.TryGetValue (name, out ns)) {
220 ns.Error_TypeArgumentsCannotBeUsed (ctx, null, arity, loc);
224 string assembly = null;
225 string possible_name = fullname + "." + name;
227 // Only assembly unique name should be added
228 switch (possible_name) {
229 case "System.Drawing":
230 case "System.Web.Services":
233 case "System.Configuration":
234 case "System.Data.Services":
235 case "System.DirectoryServices":
237 case "System.Net.Http":
238 case "System.Numerics":
239 case "System.Runtime.Caching":
240 case "System.ServiceModel":
241 case "System.Transactions":
242 case "System.Web.Routing":
243 case "System.Xml.Linq":
245 assembly = possible_name;
249 case "System.Linq.Expressions":
250 assembly = "System.Core";
253 case "System.Windows.Forms":
254 case "System.Windows.Forms.Layout":
255 assembly = "System.Windows.Name";
259 assembly = assembly == null ? "an" : "`" + assembly + "'";
261 if (this is GlobalRootNamespace) {
262 ctx.Module.Compiler.Report.Error (400, loc,
263 "The type or namespace name `{0}' could not be found in the global namespace. Are you missing {1} assembly reference?",
266 ctx.Module.Compiler.Report.Error (234, loc,
267 "The type or namespace name `{0}' does not exist in the namespace `{1}'. Are you missing {2} assembly reference?",
268 name, GetSignatureForError (), assembly);
272 public override string GetSignatureForError ()
277 public Namespace AddNamespace (MemberName name)
280 if (name.Left != null) {
282 ns_parent = parent.AddNamespace (name.Left);
284 ns_parent = AddNamespace (name.Left);
289 return ns_parent.TryAddNamespace (name.Basename);
292 Namespace TryAddNamespace (string name)
296 if (!namespaces.TryGetValue (name, out ns)) {
297 ns = new Namespace (this, name);
298 namespaces.Add (name, ns);
304 // TODO: Replace with CreateNamespace where MemberName is created for the method call
305 public Namespace GetNamespace (string name, bool create)
307 int pos = name.IndexOf ('.');
312 first = name.Substring (0, pos);
316 if (!namespaces.TryGetValue (first, out ns)) {
320 ns = new Namespace (this, first);
321 namespaces.Add (first, ns);
325 ns = ns.GetNamespace (name.Substring (pos + 1), create);
330 public IList<TypeSpec> GetAllTypes (string name)
332 IList<TypeSpec> found;
333 if (types == null || !types.TryGetValue (name, out found))
339 public TypeExpr LookupType (IMemberContext ctx, string name, int arity, LookupMode mode, Location loc)
345 if (arity == 0 && cached_types.TryGetValue (name, out te))
348 IList<TypeSpec> found;
349 if (!types.TryGetValue (name, out found))
352 TypeSpec best = null;
353 foreach (var ts in found) {
354 if (ts.Arity == arity) {
356 if ((ts.Modifiers & Modifiers.INTERNAL) != 0 && !ts.MemberDefinition.IsInternalAsPublic (ctx.Module.DeclaringAssembly) && mode != LookupMode.IgnoreAccessibility)
363 if (best.MemberDefinition.IsImported && ts.MemberDefinition.IsImported) {
364 if (mode == LookupMode.Normal) {
365 ctx.Module.Compiler.Report.SymbolRelatedToPreviousError (best);
366 ctx.Module.Compiler.Report.SymbolRelatedToPreviousError (ts);
367 ctx.Module.Compiler.Report.Error (433, loc, "The imported type `{0}' is defined multiple times", ts.GetSignatureForError ());
372 if (best.MemberDefinition.IsImported)
375 if ((best.Modifiers & Modifiers.INTERNAL) != 0 && !best.MemberDefinition.IsInternalAsPublic (ctx.Module.DeclaringAssembly))
378 if (mode != LookupMode.Normal)
381 if (ts.MemberDefinition.IsImported)
382 ctx.Module.Compiler.Report.SymbolRelatedToPreviousError (ts);
384 ctx.Module.Compiler.Report.Warning (436, 2, loc,
385 "The type `{0}' conflicts with the imported type of same name'. Ignoring the imported type definition",
386 best.GetSignatureForError ());
390 // Lookup for the best candidate with the closest arity match
395 } else if (System.Math.Abs (ts.Arity + arity) < System.Math.Abs (best.Arity + arity)) {
404 te = new TypeExpression (best, Location.Null);
406 // TODO MemberCache: Cache more
407 if (arity == 0 && mode == LookupMode.Normal)
408 cached_types.Add (name, te);
413 public FullNamedExpression LookupTypeOrNamespace (IMemberContext ctx, string name, int arity, LookupMode mode, Location loc)
415 var texpr = LookupType (ctx, name, arity, mode, loc);
418 if (arity == 0 && namespaces.TryGetValue (name, out ns)) {
422 if (mode != LookupMode.Probing) {
423 ctx.Module.Compiler.Report.SymbolRelatedToPreviousError (texpr.Type);
424 // ctx.Module.Compiler.Report.SymbolRelatedToPreviousError (ns.loc, "");
425 ctx.Module.Compiler.Report.Warning (437, 2, loc,
426 "The type `{0}' conflicts with the imported namespace `{1}'. Using the definition found in the source file",
427 texpr.GetSignatureForError (), ns.GetSignatureForError ());
430 if (texpr.Type.MemberDefinition.IsImported)
438 // Completes types with the given `prefix'
440 public IEnumerable<string> CompletionGetTypesStartingWith (string prefix)
443 return Enumerable.Empty<string> ();
445 var res = from item in types
446 where item.Key.StartsWith (prefix) && item.Value.Any (l => (l.Modifiers & Modifiers.PUBLIC) != 0)
449 if (namespaces != null)
450 res = res.Concat (from item in namespaces where item.Key.StartsWith (prefix) select item.Key);
456 // Looks for extension method in this namespace
458 public List<MethodSpec> LookupExtensionMethod (IMemberContext invocationContext, TypeSpec extensionType, string name, int arity)
460 if (extension_method_types == null)
463 List<MethodSpec> found = null;
464 for (int i = 0; i < extension_method_types.Count; ++i) {
465 var ts = extension_method_types[i];
468 // When the list was built we didn't know what members the type
471 if ((ts.Modifiers & Modifiers.METHOD_EXTENSION) == 0) {
472 if (extension_method_types.Count == 1) {
473 extension_method_types = null;
477 extension_method_types.RemoveAt (i--);
481 var res = ts.MemberCache.FindExtensionMethods (invocationContext, extensionType, name, arity);
488 found.AddRange (res);
495 public void AddType (ModuleContainer module, TypeSpec ts)
498 types = new Dictionary<string, IList<TypeSpec>> (64);
501 if ((ts.IsStatic || ts.MemberDefinition.IsPartial) && ts.Arity == 0 &&
502 (ts.MemberDefinition.DeclaringAssembly == null || ts.MemberDefinition.DeclaringAssembly.HasExtensionMethod)) {
503 if (extension_method_types == null)
504 extension_method_types = new List<TypeSpec> ();
506 extension_method_types.Add (ts);
510 IList<TypeSpec> existing;
511 if (types.TryGetValue (name, out existing)) {
512 TypeSpec better_type;
514 if (existing.Count == 1) {
516 if (ts.Arity == found.Arity) {
517 better_type = IsImportedTypeOverride (module, ts, found);
518 if (better_type == found)
521 if (better_type != null) {
522 existing [0] = better_type;
527 existing = new List<TypeSpec> ();
528 existing.Add (found);
529 types[name] = existing;
531 for (int i = 0; i < existing.Count; ++i) {
533 if (ts.Arity != found.Arity)
536 better_type = IsImportedTypeOverride (module, ts, found);
537 if (better_type == found)
540 if (better_type != null) {
541 existing.RemoveAt (i);
550 types.Add (name, new TypeSpec[] { ts });
555 // We import any types but in the situation there are same types
556 // but one has better visibility (either public or internal with friend)
557 // the less visible type is removed from the namespace cache
559 public static TypeSpec IsImportedTypeOverride (ModuleContainer module, TypeSpec ts, TypeSpec found)
561 var ts_accessible = (ts.Modifiers & Modifiers.PUBLIC) != 0 || ts.MemberDefinition.IsInternalAsPublic (module.DeclaringAssembly);
562 var found_accessible = (found.Modifiers & Modifiers.PUBLIC) != 0 || found.MemberDefinition.IsInternalAsPublic (module.DeclaringAssembly);
564 if (ts_accessible && !found_accessible)
567 // found is better always better for accessible or inaccessible ts
574 public void RemoveContainer (TypeContainer tc)
576 types.Remove (tc.Basename);
577 cached_types.Remove (tc.Basename);
580 public override FullNamedExpression ResolveAsTypeOrNamespace (IMemberContext mc)
585 public void SetBuiltinType (BuiltinTypeSpec pts)
587 var found = types[pts.Name];
588 cached_types.Remove (pts.Name);
589 if (found.Count == 1) {
590 types[pts.Name][0] = pts;
592 throw new NotImplementedException ();
596 public void VerifyClsCompliance ()
598 if (types == null || cls_checked)
603 // TODO: This is quite ugly way to check for CLS compliance at namespace level
605 var locase_types = new Dictionary<string, List<TypeSpec>> (StringComparer.OrdinalIgnoreCase);
606 foreach (var tgroup in types.Values) {
607 foreach (var tm in tgroup) {
608 if ((tm.Modifiers & Modifiers.PUBLIC) == 0 || !tm.IsCLSCompliant ())
611 List<TypeSpec> found;
612 if (!locase_types.TryGetValue (tm.Name, out found)) {
613 found = new List<TypeSpec> ();
614 locase_types.Add (tm.Name, found);
621 foreach (var locase in locase_types.Values) {
622 if (locase.Count < 2)
625 bool all_same = true;
626 foreach (var notcompliant in locase) {
627 all_same = notcompliant.Name == locase[0].Name;
635 TypeContainer compiled = null;
636 foreach (var notcompliant in locase) {
637 if (!notcompliant.MemberDefinition.IsImported) {
638 if (compiled != null)
639 compiled.Compiler.Report.SymbolRelatedToPreviousError (compiled);
641 compiled = notcompliant.MemberDefinition as TypeContainer;
643 compiled.Compiler.Report.SymbolRelatedToPreviousError (notcompliant);
647 compiled.Compiler.Report.Warning (3005, 1, compiled.Location,
648 "Identifier `{0}' differing only in case is not CLS-compliant", compiled.GetSignatureForError ());
653 public class CompilationSourceFile : NamespaceContainer
655 readonly SourceFile file;
656 CompileUnitEntry comp_unit;
657 Dictionary<string, SourceFile> include_files;
658 Dictionary<string, bool> conditionals;
660 public CompilationSourceFile (ModuleContainer parent, SourceFile sourceFile)
663 this.file = sourceFile;
666 public CompilationSourceFile (ModuleContainer parent)
671 public CompileUnitEntry SymbolUnitEntry {
677 public string FileName {
683 public SourceFile SourceFile {
689 public void AddIncludeFile (SourceFile file)
691 if (file == this.file)
694 if (include_files == null)
695 include_files = new Dictionary<string, SourceFile> ();
697 if (!include_files.ContainsKey (file.FullPathName))
698 include_files.Add (file.FullPathName, file);
701 public void AddDefine (string value)
703 if (conditionals == null)
704 conditionals = new Dictionary<string, bool> (2);
706 conditionals[value] = true;
709 public void AddUndefine (string value)
711 if (conditionals == null)
712 conditionals = new Dictionary<string, bool> (2);
714 conditionals[value] = false;
717 public override void PrepareEmit ()
719 var sw = Module.DeclaringAssembly.SymbolWriter;
721 CreateUnitSymbolInfo (sw);
728 // Creates symbol file index in debug symbol file
730 void CreateUnitSymbolInfo (MonoSymbolFile symwriter)
732 var si = file.CreateSymbolInfo (symwriter);
733 comp_unit = new CompileUnitEntry (symwriter, si);;
735 if (include_files != null) {
736 foreach (SourceFile include in include_files.Values) {
737 si = include.CreateSymbolInfo (symwriter);
738 comp_unit.AddFile (si);
743 public bool IsConditionalDefined (string value)
745 if (conditionals != null) {
747 if (conditionals.TryGetValue (value, out res))
750 // When conditional was undefined
751 if (conditionals.ContainsKey (value))
755 return Compiler.Settings.IsConditionalSymbolDefined (value);
761 // Namespace block as created by the parser
763 public class NamespaceContainer : TypeContainer, IMemberContext
765 static readonly Namespace[] empty_namespaces = new Namespace[0];
767 readonly Namespace ns;
769 public new readonly NamespaceContainer Parent;
771 List<UsingNamespace> clauses;
773 // Used by parsed to check for parser errors
774 public bool DeclarationFound;
776 Namespace[] namespace_using_table;
777 Dictionary<string, UsingAliasNamespace> aliases;
779 public NamespaceContainer (MemberName name, NamespaceContainer parent)
780 : base (parent, name, null, MemberKind.Namespace)
782 this.Parent = parent;
783 this.ns = parent.NS.AddNamespace (name);
785 containers = new List<TypeContainer> ();
788 protected NamespaceContainer (ModuleContainer parent)
789 : base (parent, null, null, MemberKind.Namespace)
791 ns = parent.GlobalRootNamespace;
792 containers = new List<TypeContainer> (2);
797 public override AttributeTargets AttributeTargets {
799 throw new NotSupportedException ();
803 public override string DocCommentHeader {
805 throw new NotSupportedException ();
809 public Namespace NS {
815 public List<UsingNamespace> Usings {
821 public override string[] ValidAttributeTargets {
823 throw new NotSupportedException ();
829 public void AddUsing (UsingNamespace un)
831 if (DeclarationFound){
832 Compiler.Report.Error (1529, un.Location, "A using clause must precede all other namespace elements except extern alias declarations");
836 clauses = new List<UsingNamespace> ();
841 public void AddUsing (UsingAliasNamespace un)
843 if (DeclarationFound){
844 Compiler.Report.Error (1529, un.Location, "A using clause must precede all other namespace elements except extern alias declarations");
850 void AddAlias (UsingAliasNamespace un)
852 if (clauses == null) {
853 clauses = new List<UsingNamespace> ();
855 foreach (var entry in clauses) {
856 var a = entry as UsingAliasNamespace;
857 if (a != null && a.Alias.Value == un.Alias.Value) {
858 Compiler.Report.SymbolRelatedToPreviousError (a.Location, "");
859 Compiler.Report.Error (1537, un.Location,
860 "The using alias `{0}' appeared previously in this namespace", un.Alias.Value);
868 public override void AddPartial (TypeDefinition next_part)
870 var existing = ns.LookupType (this, next_part.MemberName.Name, next_part.MemberName.Arity, LookupMode.Probing, Location.Null);
871 var td = existing != null ? existing.Type.MemberDefinition as TypeDefinition : null;
872 AddPartial (next_part, td);
875 public override void AddTypeContainer (TypeContainer tc)
877 string name = tc.Basename;
879 var mn = tc.MemberName;
880 while (mn.Left != null) {
885 var names_container = Parent == null ? Module : (TypeContainer) this;
888 if (names_container.DefinedNames.TryGetValue (name, out mc)) {
889 if (tc is NamespaceContainer && mc is NamespaceContainer) {
894 Report.SymbolRelatedToPreviousError (mc);
895 if ((mc.ModFlags & Modifiers.PARTIAL) != 0 && (tc is ClassOrStruct || tc is Interface)) {
896 Error_MissingPartialModifier (tc);
898 Report.Error (101, tc.Location, "The namespace `{0}' already contains a definition for `{1}'",
899 GetSignatureForError (), mn.GetSignatureForError ());
902 names_container.DefinedNames.Add (name, tc);
904 var tdef = tc.PartialContainer;
907 // Same name conflict in different namespace containers
909 var conflict = ns.GetAllTypes (name);
910 if (conflict != null) {
911 foreach (var e in conflict) {
912 if (e.Arity == mn.Arity) {
913 mc = (MemberCore) e.MemberDefinition;
920 Report.SymbolRelatedToPreviousError (mc);
921 Report.Error (101, tc.Location, "The namespace `{0}' already contains a definition for `{1}'",
922 GetSignatureForError (), mn.GetSignatureForError ());
924 ns.AddType (Module, tdef.Definition);
929 base.AddTypeContainer (tc);
932 public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
934 throw new NotSupportedException ();
937 public override void EmitContainer ()
939 VerifyClsCompliance ();
941 base.EmitContainer ();
944 public ExtensionMethodCandidates LookupExtensionMethod (IMemberContext invocationContext, TypeSpec extensionType, string name, int arity, int position)
947 // Here we try to resume the search for extension method at the point
948 // where the last bunch of candidates was found. It's more tricky than
949 // it seems as we have to check both namespace containers and namespace
957 // <our first search found candidates in A.B.C.D
961 // In the example above namespace A.B.C.D, A.B.C and A.B have to be
962 // checked before we hit A.N1 using
964 ExtensionMethodCandidates candidates;
965 var container = this;
967 candidates = container.LookupExtensionMethodCandidates (invocationContext, extensionType, name, arity, ref position);
968 if (candidates != null || container.MemberName == null)
971 var container_ns = container.ns.Parent;
972 var mn = container.MemberName.Left;
973 int already_checked = position - 2;
974 while (already_checked-- > 0) {
976 container_ns = container_ns.Parent;
982 var methods = container_ns.LookupExtensionMethod (invocationContext, extensionType, name, arity);
983 if (methods != null) {
984 return new ExtensionMethodCandidates (invocationContext, methods, container, position);
988 container_ns = container_ns.Parent;
992 container = container.Parent;
993 } while (container != null);
998 ExtensionMethodCandidates LookupExtensionMethodCandidates (IMemberContext invocationContext, TypeSpec extensionType, string name, int arity, ref int position)
1000 List<MethodSpec> candidates = null;
1002 if (position == 0) {
1005 candidates = ns.LookupExtensionMethod (invocationContext, extensionType, name, arity);
1006 if (candidates != null) {
1007 return new ExtensionMethodCandidates (invocationContext, candidates, this, position);
1011 if (position == 1) {
1014 foreach (Namespace n in namespace_using_table) {
1015 var a = n.LookupExtensionMethod (invocationContext, extensionType, name, arity);
1019 if (candidates == null)
1022 candidates.AddRange (a);
1025 if (candidates != null)
1026 return new ExtensionMethodCandidates (invocationContext, candidates, this, position);
1032 public override FullNamedExpression LookupNamespaceOrType (string name, int arity, LookupMode mode, Location loc)
1035 // Only simple names (no dots) will be looked up with this function
1037 FullNamedExpression resolved;
1038 for (NamespaceContainer container = this; container != null; container = container.Parent) {
1039 resolved = container.Lookup (name, arity, mode, loc);
1040 if (resolved != null || container.MemberName == null)
1043 var container_ns = container.ns.Parent;
1044 var mn = container.MemberName.Left;
1045 while (mn != null) {
1046 resolved = container_ns.LookupTypeOrNamespace (this, name, arity, mode, loc);
1047 if (resolved != null)
1051 container_ns = container_ns.Parent;
1058 public override void GetCompletionStartingWith (string prefix, List<string> results)
1060 foreach (var un in Usings) {
1061 if (un.Alias != null)
1064 var name = un.NamespaceExpression.Name;
1065 if (name.StartsWith (prefix))
1070 IEnumerable<string> all = Enumerable.Empty<string> ();
1072 foreach (Namespace using_ns in namespace_using_table) {
1073 if (prefix.StartsWith (using_ns.Name)) {
1074 int ld = prefix.LastIndexOf ('.');
1076 string rest = prefix.Substring (ld + 1);
1078 all = all.Concat (using_ns.CompletionGetTypesStartingWith (rest));
1081 all = all.Concat (using_ns.CompletionGetTypesStartingWith (prefix));
1084 results.AddRange (all);
1086 base.GetCompletionStartingWith (prefix, results);
1091 // Looks-up a alias named @name in this and surrounding namespace declarations
1093 public FullNamedExpression LookupExternAlias (string name)
1095 if (aliases == null)
1098 UsingAliasNamespace uan;
1099 if (aliases.TryGetValue (name, out uan) && uan is UsingExternAlias)
1100 return uan.ResolvedExpression;
1106 // Looks-up a alias named @name in this and surrounding namespace declarations
1108 public override FullNamedExpression LookupNamespaceAlias (string name)
1110 for (NamespaceContainer n = this; n != null; n = n.Parent) {
1111 if (n.aliases == null)
1114 UsingAliasNamespace uan;
1115 if (n.aliases.TryGetValue (name, out uan))
1116 return uan.ResolvedExpression;
1122 FullNamedExpression Lookup (string name, int arity, LookupMode mode, Location loc)
1125 // Check whether it's in the namespace.
1127 FullNamedExpression fne = ns.LookupTypeOrNamespace (this, name, arity, mode, loc);
1132 if (aliases != null && arity == 0) {
1133 UsingAliasNamespace uan;
1134 if (aliases.TryGetValue (name, out uan)) {
1136 // TODO: Namespace has broken location
1137 //Report.SymbolRelatedToPreviousError (fne.Location, null);
1138 Compiler.Report.SymbolRelatedToPreviousError (uan.Location, null);
1139 Compiler.Report.Error (576, loc,
1140 "Namespace `{0}' contains a definition with same name as alias `{1}'",
1141 GetSignatureForError (), name);
1144 return uan.ResolvedExpression;
1152 // Lookup can be called before the namespace is defined from different namespace using alias clause
1154 if (namespace_using_table == null) {
1155 DoDefineNamespace ();
1159 // Check using entries.
1161 FullNamedExpression match = null;
1162 foreach (Namespace using_ns in namespace_using_table) {
1164 // A using directive imports only types contained in the namespace, it
1165 // does not import any nested namespaces
1167 fne = using_ns.LookupType (this, name, arity, mode, loc);
1171 if (match == null) {
1176 // Prefer types over namespaces
1177 var texpr_fne = fne as TypeExpr;
1178 var texpr_match = match as TypeExpr;
1179 if (texpr_fne != null && texpr_match == null) {
1182 } else if (texpr_fne == null) {
1186 // It can be top level accessibility only
1187 var better = Namespace.IsImportedTypeOverride (Module, texpr_match.Type, texpr_fne.Type);
1188 if (better == null) {
1189 if (mode == LookupMode.Normal) {
1190 Compiler.Report.SymbolRelatedToPreviousError (texpr_match.Type);
1191 Compiler.Report.SymbolRelatedToPreviousError (texpr_fne.Type);
1192 Compiler.Report.Error (104, loc, "`{0}' is an ambiguous reference between `{1}' and `{2}'",
1193 name, texpr_match.GetSignatureForError (), texpr_fne.GetSignatureForError ());
1199 if (better == texpr_fne.Type)
1206 protected override void DefineNamespace ()
1208 if (namespace_using_table == null)
1209 DoDefineNamespace ();
1211 base.DefineNamespace ();
1214 void DoDefineNamespace ()
1216 namespace_using_table = empty_namespaces;
1218 if (clauses != null) {
1219 var list = new List<Namespace> (clauses.Count);
1220 bool post_process_using_aliases = false;
1222 for (int i = 0; i < clauses.Count; ++i) {
1223 var entry = clauses[i];
1225 if (entry.Alias != null) {
1226 if (aliases == null)
1227 aliases = new Dictionary<string, UsingAliasNamespace> ();
1230 // Aliases are not available when resolving using section
1231 // except extern aliases
1233 if (entry is UsingExternAlias) {
1234 entry.Define (this);
1235 if (entry.ResolvedExpression != null)
1236 aliases.Add (entry.Alias.Value, (UsingExternAlias) entry);
1238 clauses.RemoveAt (i--);
1240 post_process_using_aliases = true;
1246 entry.Define (this);
1249 // It's needed for repl only, when using clause cannot be resolved don't hold it in
1250 // global list which is resolved for each evaluation
1252 if (entry.ResolvedExpression == null) {
1253 clauses.RemoveAt (i--);
1257 Namespace using_ns = entry.ResolvedExpression as Namespace;
1258 if (using_ns == null)
1261 if (list.Contains (using_ns)) {
1262 // Ensure we don't report the warning multiple times in repl
1263 clauses.RemoveAt (i--);
1265 Compiler.Report.Warning (105, 3, entry.Location,
1266 "The using directive for `{0}' appeared previously in this namespace", using_ns.GetSignatureForError ());
1268 list.Add (using_ns);
1272 namespace_using_table = list.ToArray ();
1274 if (post_process_using_aliases) {
1275 for (int i = 0; i < clauses.Count; ++i) {
1276 var entry = clauses[i];
1277 if (entry.Alias != null) {
1278 entry.Define (this);
1279 if (entry.ResolvedExpression != null) {
1280 aliases.Add (entry.Alias.Value, (UsingAliasNamespace) entry);
1283 clauses.RemoveAt (i--);
1290 public void EnableUsingClausesRedefinition ()
1292 namespace_using_table = null;
1295 internal override void GenerateDocComment (DocumentationBuilder builder)
1297 if (containers != null) {
1298 foreach (var tc in containers)
1299 tc.GenerateDocComment (builder);
1303 public override string GetSignatureForError ()
1305 return MemberName == null ? "global::" : base.GetSignatureForError ();
1308 public override void RemoveContainer (TypeContainer cont)
1310 base.RemoveContainer (cont);
1311 NS.RemoveContainer (cont);
1314 protected override bool VerifyClsCompliance ()
1316 if (Module.IsClsComplianceRequired ()) {
1317 if (MemberName != null && MemberName.Name[0] == '_') {
1318 Warning_IdentifierNotCompliant ();
1321 ns.VerifyClsCompliance ();
1329 public class UsingNamespace
1331 readonly ATypeNameExpression expr;
1332 readonly Location loc;
1333 protected FullNamedExpression resolved;
1335 public UsingNamespace (ATypeNameExpression expr, Location loc)
1343 public virtual SimpleMemberName Alias {
1349 public Location Location {
1355 public ATypeNameExpression NamespaceExpression {
1361 public FullNamedExpression ResolvedExpression {
1369 public string GetSignatureForError ()
1371 return expr.GetSignatureForError ();
1374 public virtual void Define (NamespaceContainer ctx)
1376 resolved = expr.ResolveAsTypeOrNamespace (ctx);
1377 var ns = resolved as Namespace;
1379 if (resolved != null) {
1380 ctx.Module.Compiler.Report.SymbolRelatedToPreviousError (resolved.Type);
1381 ctx.Module.Compiler.Report.Error (138, Location,
1382 "`{0}' is a type not a namespace. A using namespace directive can only be applied to namespaces",
1383 GetSignatureForError ());
1389 public class UsingExternAlias : UsingAliasNamespace
1391 public UsingExternAlias (SimpleMemberName alias, Location loc)
1392 : base (alias, null, loc)
1396 public override void Define (NamespaceContainer ctx)
1398 resolved = ctx.Module.GetRootNamespace (Alias.Value);
1399 if (resolved == null) {
1400 ctx.Module.Compiler.Report.Error (430, Location,
1401 "The extern alias `{0}' was not specified in -reference option",
1407 public class UsingAliasNamespace : UsingNamespace
1409 readonly SimpleMemberName alias;
1411 public struct AliasContext : IMemberContext
1413 readonly NamespaceContainer ns;
1415 public AliasContext (NamespaceContainer ns)
1420 public TypeSpec CurrentType {
1426 public TypeParameters CurrentTypeParameters {
1432 public MemberCore CurrentMemberDefinition {
1438 public bool IsObsolete {
1444 public bool IsUnsafe {
1446 throw new NotImplementedException ();
1450 public bool IsStatic {
1452 throw new NotImplementedException ();
1456 public ModuleContainer Module {
1462 public string GetSignatureForError ()
1464 throw new NotImplementedException ();
1467 public ExtensionMethodCandidates LookupExtensionMethod (TypeSpec extensionType, string name, int arity)
1472 public FullNamedExpression LookupNamespaceOrType (string name, int arity, LookupMode mode, Location loc)
1474 var fne = ns.NS.LookupTypeOrNamespace (ns, name, arity, mode, loc);
1479 // Only extern aliases are allowed in this context
1481 fne = ns.LookupExternAlias (name);
1482 if (fne != null || ns.MemberName == null)
1485 var container_ns = ns.NS.Parent;
1486 var mn = ns.MemberName.Left;
1487 while (mn != null) {
1488 fne = container_ns.LookupTypeOrNamespace (this, name, arity, mode, loc);
1493 container_ns = container_ns.Parent;
1496 if (ns.Parent != null)
1497 return ns.Parent.LookupNamespaceOrType (name, arity, mode, loc);
1502 public FullNamedExpression LookupNamespaceAlias (string name)
1504 return ns.LookupNamespaceAlias (name);
1508 public UsingAliasNamespace (SimpleMemberName alias, ATypeNameExpression expr, Location loc)
1514 public override SimpleMemberName Alias {
1520 public override void Define (NamespaceContainer ctx)
1523 // The namespace-or-type-name of a using-alias-directive is resolved as if
1524 // the immediately containing compilation unit or namespace body had no
1525 // using-directives. A using-alias-directive may however be affected
1526 // by extern-alias-directives in the immediately containing compilation
1527 // unit or namespace body
1529 // We achieve that by introducing alias-context which redirect any local
1530 // namespace or type resolve calls to parent namespace
1532 resolved = NamespaceExpression.ResolveAsTypeOrNamespace (new AliasContext (ctx));