2 // namespace.cs: Tracks namespaces
5 // Miguel de Icaza (miguel@ximian.com)
7 // (C) 2001 Ximian, Inc.
10 using System.Collections;
12 namespace Mono.CSharp {
15 /// Keeps track of the namespaces defined in the C# code.
17 /// This is an Expression to allow it to be referenced in the
18 /// compiler parse/intermediate tree during name resolution.
20 public class Namespace : FullNamedExpression, IAlias {
21 static ArrayList all_namespaces;
22 static Hashtable namespaces_map;
28 Hashtable defined_names;
29 Hashtable cached_types;
31 public readonly MemberName MemberName;
33 public static Namespace Root;
40 public static void Reset ()
42 all_namespaces = new ArrayList ();
43 namespaces_map = new Hashtable ();
45 Root = new Namespace (null, "");
49 /// Constructor Takes the current namespace and the
50 /// name. This is bootstrapped with parent == null
53 public Namespace (Namespace parent, string name)
55 // Expression members.
56 this.eclass = ExprClass.Namespace;
58 this.loc = Location.Null;
62 string pname = parent != null ? parent.Name : "";
67 fullname = parent.Name + "." + name;
69 if (parent != null && parent.MemberName != MemberName.Null)
70 MemberName = new MemberName (parent.MemberName, name);
72 MemberName = MemberName.Null;
74 MemberName = new MemberName (name);
76 entries = new ArrayList ();
77 namespaces = new Hashtable ();
78 defined_names = new Hashtable ();
79 cached_types = new Hashtable ();
81 all_namespaces.Add (this);
82 if (namespaces_map.Contains (fullname))
84 namespaces_map [fullname] = true;
87 public override Expression DoResolve (EmitContext ec)
92 public override void Emit (EmitContext ec)
94 throw new InternalErrorException ("Expression tree referenced namespace " + fullname + " during Emit ()");
97 public static bool IsNamespace (string name)
99 return namespaces_map [name] != null;
102 public Namespace GetNamespace (string name, bool create)
104 int pos = name.IndexOf ('.');
109 first = name.Substring (0, pos);
113 ns = (Namespace) namespaces [first];
118 ns = new Namespace (this, first);
119 namespaces.Add (first, ns);
123 ns = ns.GetNamespace (name.Substring (pos + 1), create);
128 public static Namespace LookupNamespace (string name, bool create)
130 return Root.GetNamespace (name, create);
133 public FullNamedExpression Lookup (DeclSpace ds, string name, Location loc)
135 Namespace ns = GetNamespace (name, false);
140 if (cached_types.Contains (name)) {
141 te = (TypeExpr) cached_types [name];
144 DeclSpace tdecl = defined_names [name] as DeclSpace;
147 // Note that this is not:
149 // t = tdecl.DefineType ()
151 // This is to make it somewhat more useful when a DefineType
152 // fails due to problems in nested types (more useful in the sense
153 // of fewer misleading error messages)
156 t = tdecl.TypeBuilder;
158 string lookup = this == Namespace.Root ? name : fullname + "." + name;
159 t = TypeManager.LookupTypeReflection (lookup);
161 te = t == null ? null : new TypeExpression (t, Location.Null);
162 cached_types [name] = te;
165 if (te != null && ds != null && !ds.CheckAccessLevel (te.Type))
171 public void AddNamespaceEntry (NamespaceEntry entry)
176 public void DefineName (string name, IAlias o)
178 defined_names.Add (name, o);
181 static public ArrayList UserDefinedNamespaces {
183 return all_namespaces;
188 /// The qualified name of the current namespace
196 public override string FullName {
203 /// The parent of this namespace, used by the parser to "Pop"
204 /// the current namespace declaration
206 public Namespace Parent {
212 public static void DefineNamespaces (SymbolWriter symwriter)
214 foreach (Namespace ns in all_namespaces) {
215 foreach (NamespaceEntry entry in ns.entries)
216 entry.DefineNamespace (symwriter);
221 /// Used to validate that all the using clauses are correct
222 /// after we are finished parsing all the files.
224 public static void VerifyUsing ()
226 foreach (Namespace ns in all_namespaces) {
227 foreach (NamespaceEntry entry in ns.entries)
228 entry.VerifyUsing ();
232 public override string ToString ()
235 return "Namespace (<root>)";
237 return String.Format ("Namespace ({0})", Name);
241 get { return false; }
244 TypeExpr IAlias.ResolveAsType (EmitContext ec)
246 throw new InvalidOperationException ();
250 public class NamespaceEntry
253 NamespaceEntry parent, implicit_parent;
257 ArrayList using_clauses;
258 public bool DeclarationFound = false;
261 // This class holds the location where a using definition is
262 // done, and whether it has been used by the program or not.
264 // We use this to flag using clauses for namespaces that do not
267 public class UsingEntry {
268 public MemberName Name;
269 public Expression Expr;
270 public readonly NamespaceEntry NamespaceEntry;
271 public readonly Location Location;
273 public UsingEntry (NamespaceEntry entry, MemberName name, Location loc)
276 Expr = name.GetTypeExpression (loc);
277 NamespaceEntry = entry;
281 internal FullNamedExpression resolved;
283 public Namespace Resolve ()
285 if (resolved != null)
286 return resolved as Namespace;
288 DeclSpace root = RootContext.Tree.Types;
289 root.NamespaceEntry = NamespaceEntry;
290 resolved = Expr.ResolveAsTypeStep (root.EmitContext);
291 root.NamespaceEntry = null;
293 return resolved as Namespace;
297 public class AliasEntry {
298 public readonly string Name;
299 public readonly Expression Alias;
300 public readonly NamespaceEntry NamespaceEntry;
301 public readonly Location Location;
303 public AliasEntry (NamespaceEntry entry, string name, MemberName alias, Location loc)
306 Alias = alias.GetTypeExpression (loc);
307 NamespaceEntry = entry;
311 FullNamedExpression resolved;
313 public FullNamedExpression Resolve ()
315 if (resolved != null)
318 DeclSpace root = RootContext.Tree.Types;
319 root.NamespaceEntry = NamespaceEntry;
320 resolved = Alias.ResolveAsTypeStep (root.EmitContext);
321 root.NamespaceEntry = null;
327 public NamespaceEntry (NamespaceEntry parent, SourceFile file, string name, Location loc)
329 this.parent = parent;
331 this.IsImplicit = false;
335 ns = parent.NS.GetNamespace (name, true);
336 else if (name != null)
337 ns = Namespace.LookupNamespace (name, true);
340 ns.AddNamespaceEntry (this);
344 private NamespaceEntry (NamespaceEntry parent, SourceFile file, Namespace ns)
346 this.parent = parent;
348 this.IsImplicit = true;
354 // According to section 16.3.1 (using-alias-directive), the namespace-or-type-name is
355 // resolved as if the immediately containing namespace body has no using-directives.
357 // Section 16.3.2 says that the same rule is applied when resolving the namespace-name
358 // in the using-namespace-directive.
360 // To implement these rules, the expressions in the using directives are resolved using
361 // the "doppelganger" (ghostly bodiless duplicate).
363 NamespaceEntry doppelganger;
364 NamespaceEntry Doppelganger {
366 if (!IsImplicit && doppelganger == null)
367 doppelganger = new NamespaceEntry (ImplicitParent, file, ns);
372 static int next_id = 0;
373 public readonly int ID;
374 public readonly bool IsImplicit;
376 public Namespace NS {
382 public NamespaceEntry Parent {
388 public NamespaceEntry ImplicitParent {
392 if (implicit_parent == null) {
393 implicit_parent = (parent.NS == ns.Parent)
395 : new NamespaceEntry (parent, file, ns.Parent);
397 return implicit_parent;
402 /// Records a new namespace for resolving name references
404 public void Using (MemberName name, Location loc)
406 if (DeclarationFound){
407 Report.Error (1529, loc, "A using clause must precede all other namespace elements");
411 if (name.Equals (ns.MemberName))
414 if (using_clauses == null)
415 using_clauses = new ArrayList ();
417 foreach (UsingEntry old_entry in using_clauses) {
418 if (name.Equals (old_entry.Name)) {
419 if (RootContext.WarningLevel >= 3)
420 Report.Warning (105, loc, "The using directive for '{0}' appeared previously in this namespace", name);
426 UsingEntry ue = new UsingEntry (Doppelganger, name, loc);
427 using_clauses.Add (ue);
430 public void UsingAlias (string name, MemberName alias, Location loc)
432 if (DeclarationFound){
433 Report.Error (1529, loc, "A using clause must precede all other namespace elements");
438 aliases = new Hashtable ();
440 if (aliases.Contains (name)){
441 AliasEntry ae = (AliasEntry)aliases [name];
442 Report.SymbolRelatedToPreviousError (ae.Location, ae.Name);
443 Report.Error (1537, loc, "The using alias `" + name +
444 "' appeared previously in this namespace");
448 aliases [name] = new AliasEntry (Doppelganger, name, alias, loc);
451 public FullNamedExpression LookupAlias (string alias)
453 AliasEntry entry = null;
455 entry = (AliasEntry) aliases [alias];
457 return entry == null ? null : entry.Resolve ();
460 static readonly char [] dot_array = { '.' };
462 public FullNamedExpression LookupNamespaceOrType (DeclSpace ds, string name, Location loc, bool ignore_cs0104)
464 FullNamedExpression resolved = null;
467 // If name is of the form `N.I', first lookup `N', then search a member `I' in it.
468 int pos = name.IndexOf ('.');
470 rest = name.Substring (pos + 1);
471 name = name.Substring (0, pos);
474 for (NamespaceEntry curr_ns = this; curr_ns != null; curr_ns = curr_ns.ImplicitParent) {
475 if ((resolved = curr_ns.Lookup (ds, name, loc, ignore_cs0104)) != null)
479 if (resolved == null || rest == null)
482 // Now handle the rest of the the name.
483 string [] elements = rest.Split (dot_array);
484 int count = elements.Length;
486 while (i < count && resolved != null && resolved is Namespace) {
487 Namespace ns = resolved as Namespace;
488 resolved = ns.Lookup (ds, elements [i++], loc);
491 if (resolved == null || resolved is Namespace)
494 Type t = ((TypeExpr) resolved).Type;
497 if (ds != null && !ds.CheckAccessLevel (t))
500 return new TypeExpression (t, Location.Null);
501 t = TypeManager.GetNestedType (t, elements [i++]);
507 private FullNamedExpression Lookup (DeclSpace ds, string name, Location loc, bool ignore_cs0104)
509 // Precondition: Only simple names (no dots) will be looked up with this function.
512 // Check whether it's in the namespace.
514 FullNamedExpression o = NS.Lookup (ds, name, loc);
524 o = LookupAlias (name);
529 // Check using entries.
531 FullNamedExpression t = null, match = null;
532 foreach (Namespace using_ns in GetUsingTable ()) {
533 match = using_ns.Lookup (ds, name, loc);
534 if ((match != null) && (match is TypeExpr)) {
537 DeclSpace.Error_AmbiguousTypeReference (loc, name, t.FullName, match.FullName);
549 // Our cached computation.
550 Namespace [] namespace_using_table;
551 public Namespace[] GetUsingTable ()
553 if (namespace_using_table != null)
554 return namespace_using_table;
556 if (using_clauses == null) {
557 namespace_using_table = new Namespace [0];
558 return namespace_using_table;
561 ArrayList list = new ArrayList (using_clauses.Count);
563 foreach (UsingEntry ue in using_clauses) {
564 Namespace using_ns = ue.Resolve ();
565 if (using_ns == null)
571 namespace_using_table = new Namespace [list.Count];
572 list.CopyTo (namespace_using_table, 0);
573 return namespace_using_table;
576 public void DefineNamespace (SymbolWriter symwriter)
581 parent.DefineNamespace (symwriter);
584 if (using_clauses != null) {
585 using_list = new string [using_clauses.Count];
586 for (int i = 0; i < using_clauses.Count; i++)
587 using_list [i] = ((UsingEntry) using_clauses [i]).Name.ToString ();
589 using_list = new string [0];
592 int parent_id = parent != null ? parent.symfile_id : 0;
593 if (file.SourceFileEntry == null)
596 symfile_id = symwriter.DefineNamespace (
597 ns.Name, file.SourceFileEntry, using_list, parent_id);
600 public int SymbolFileID {
606 static void MsgtryRef (string s)
608 Console.WriteLine (" Try using -r:" + s);
611 static void MsgtryPkg (string s)
613 Console.WriteLine (" Try using -pkg:" + s);
616 protected void error246 (Location loc, string name)
618 Report.Error (246, loc, "The namespace `" + name +
619 "' can not be found (missing assembly reference?)");
622 case "Gtk": case "GtkSharp":
623 MsgtryPkg ("gtk-sharp");
626 case "Gdk": case "GdkSharp":
627 MsgtryPkg ("gdk-sharp");
630 case "Glade": case "GladeSharp":
631 MsgtryPkg ("glade-sharp");
634 case "System.Drawing":
635 case "System.Web.Services":
638 case "System.Windows.Forms":
645 /// Used to validate that all the using clauses are correct
646 /// after we are finished parsing all the files.
648 public void VerifyUsing ()
650 if (using_clauses != null){
651 foreach (UsingEntry ue in using_clauses){
652 if (ue.Resolve () != null)
655 if (ue.resolved == null)
656 error246 (ue.Location, ue.Name.ToString ());
658 Report.Error (138, ue.Location, "The using keyword only lets you specify a namespace, " +
659 "`" + ue.Name + "' is a class not a namespace.");
664 if (aliases != null){
665 foreach (DictionaryEntry de in aliases){
666 AliasEntry alias = (AliasEntry) de.Value;
668 if (alias.Resolve () != null)
671 error246 (alias.Location, alias.Alias.ToString ());
676 public override string ToString ()
678 if (NS == Namespace.Root)
679 return "NamespaceEntry (<root>)";
681 return String.Format ("NamespaceEntry ({0},{1},{2})", ns.Name, IsImplicit, ID);