2 // namespace.cs: Tracks namespaces
5 // Miguel de Icaza (miguel@ximian.com)
7 // (C) 2001 Ximian, Inc.
10 using System.Collections;
13 namespace Mono.CSharp {
16 /// Keeps track of the namespaces defined in the C# code.
18 public class Namespace {
19 static ArrayList all_namespaces = new ArrayList ();
20 static Hashtable namespaces_map = new Hashtable ();
26 Hashtable defined_names;
29 /// Constructor Takes the current namespace and the
30 /// name. This is bootstrapped with parent == null
33 public Namespace (Namespace parent, string name)
37 string pname = parent != null ? parent.Name : "";
42 fullname = parent.Name + "." + name;
44 entries = new ArrayList ();
45 namespaces = new Hashtable ();
46 defined_names = new Hashtable ();
48 all_namespaces.Add (this);
49 if (namespaces_map.Contains (fullname))
51 namespaces_map [fullname] = true;
54 public static bool IsNamespace (string name)
56 return namespaces_map [name] != null;
59 public static Namespace Root = new Namespace (null, "");
61 public Namespace GetNamespace (string name, bool create)
63 int pos = name.IndexOf ('.');
68 first = name.Substring (0, pos);
72 ns = (Namespace) namespaces [first];
77 ns = new Namespace (this, first);
78 namespaces.Add (first, ns);
82 ns = ns.GetNamespace (name.Substring (pos + 1), create);
87 public static Namespace LookupNamespace (string name, bool create)
89 return Root.GetNamespace (name, create);
92 public object Lookup (DeclSpace ds, string name)
94 object o = Lookup (name);
97 DeclSpace tdecl = o as DeclSpace;
99 t = tdecl.DefineType ();
101 if ((ds == null) || ds.CheckAccessLevel (t))
105 Namespace ns = GetNamespace (name, false);
109 t = TypeManager.LookupType (DeclSpace.MakeFQN (fullname, name));
110 if ((t == null) || ((ds != null) && !ds.CheckAccessLevel (t)))
116 public void AddNamespaceEntry (NamespaceEntry entry)
121 public void DefineName (string name, object o)
123 defined_names.Add (name, o);
126 public object Lookup (string name)
128 return defined_names [name];
131 static public ArrayList UserDefinedNamespaces {
133 return all_namespaces;
138 /// The qualified name of the current namespace
147 /// The parent of this namespace, used by the parser to "Pop"
148 /// the current namespace declaration
150 public Namespace Parent {
156 public static void DefineNamespaces (SymbolWriter symwriter)
158 foreach (Namespace ns in all_namespaces) {
159 foreach (NamespaceEntry entry in ns.entries)
160 entry.DefineNamespace (symwriter);
165 /// Used to validate that all the using clauses are correct
166 /// after we are finished parsing all the files.
168 public static void VerifyUsing ()
170 foreach (Namespace ns in all_namespaces) {
171 foreach (NamespaceEntry entry in ns.entries)
172 entry.VerifyUsing ();
176 public override string ToString ()
179 return "Namespace (<root>)";
181 return String.Format ("Namespace ({0})", Name);
185 public class NamespaceEntry
188 NamespaceEntry parent, implicit_parent;
192 ArrayList using_clauses;
193 public bool DeclarationFound = false;
196 // This class holds the location where a using definition is
197 // done, and whether it has been used by the program or not.
199 // We use this to flag using clauses for namespaces that do not
202 public class UsingEntry {
203 public readonly string Name;
204 public readonly NamespaceEntry NamespaceEntry;
205 public readonly Location Location;
207 public UsingEntry (NamespaceEntry entry, string name, Location loc)
210 NamespaceEntry = entry;
214 Namespace resolved_ns;
216 public Namespace Resolve ()
218 if (resolved_ns != null)
221 Namespace curr_ns = NamespaceEntry.NS;
222 while ((curr_ns != null) && (resolved_ns == null)) {
223 resolved_ns = curr_ns.GetNamespace (Name, false);
225 if (resolved_ns == null)
226 curr_ns = curr_ns.Parent;
233 public class AliasEntry {
234 public readonly string Name;
235 public readonly string Alias;
236 public readonly NamespaceEntry NamespaceEntry;
237 public readonly Location Location;
239 public AliasEntry (NamespaceEntry entry, string name, string alias, Location loc)
243 NamespaceEntry = entry;
249 public object Resolve ()
251 if (resolved != null)
254 NamespaceEntry curr_ns = NamespaceEntry;
255 while ((curr_ns != null) && (resolved == null)) {
256 resolved = curr_ns.Lookup (null, Alias, Location);
258 if (resolved == null)
259 curr_ns = curr_ns.Parent;
266 public NamespaceEntry (NamespaceEntry parent, SourceFile file, string name, Location loc)
267 : this (parent, file, name, false, loc)
270 protected NamespaceEntry (NamespaceEntry parent, SourceFile file, string name, bool is_implicit, Location loc)
272 this.parent = parent;
274 this.IsImplicit = is_implicit;
277 if (!is_implicit && (parent != null))
278 ns = parent.NS.GetNamespace (name, true);
279 else if (name != null)
280 ns = Namespace.LookupNamespace (name, true);
283 ns.AddNamespaceEntry (this);
285 if ((parent != null) && (parent.NS != ns.Parent))
286 implicit_parent = new NamespaceEntry (parent, file, ns.Parent.Name, true, loc);
288 implicit_parent = parent;
290 this.FullName = ns.Name;
293 static int next_id = 0;
294 public readonly string FullName;
295 public readonly int ID;
296 public readonly bool IsImplicit;
298 public Namespace NS {
304 public NamespaceEntry Parent {
310 public NamespaceEntry ImplicitParent {
312 return implicit_parent;
316 public void DefineName (string name, object o)
318 ns.DefineName (name, o);
322 /// Records a new namespace for resolving name references
324 public void Using (string ns, Location loc)
326 if (DeclarationFound){
327 Report.Error (1529, loc, "A using clause must precede all other namespace elements");
334 if (using_clauses == null)
335 using_clauses = new ArrayList ();
337 foreach (UsingEntry old_entry in using_clauses){
338 if (old_entry.Name == ns){
339 Report.Warning (105, loc, "The using directive for '" + ns +
340 "' appeared previously in this namespace");
345 UsingEntry ue = new UsingEntry (this, ns, loc);
346 using_clauses.Add (ue);
349 public void UsingAlias (string alias, string namespace_or_type, Location loc)
352 aliases = new Hashtable ();
354 if (aliases.Contains (alias)){
355 Report.Error (1537, loc, "The using alias `" + alias +
356 "' appeared previously in this namespace");
360 aliases [alias] = new AliasEntry (this, alias, namespace_or_type, loc);
363 protected AliasEntry GetAliasEntry (string alias)
365 AliasEntry entry = null;
368 entry = (AliasEntry) aliases [alias];
369 if (entry == null && Parent != null)
370 entry = Parent.GetAliasEntry (alias);
375 public string LookupAlias (string alias)
377 AliasEntry entry = GetAliasEntry (alias);
382 object resolved = entry.Resolve ();
383 if (resolved == null)
385 else if (resolved is Namespace)
386 return ((Namespace) resolved).Name;
388 return ((Type) resolved).FullName;
391 public object Lookup (DeclSpace ds, string name, Location loc)
397 // If name is of the form `N.I', first lookup `N', then search a member `I' in it.
399 int pos = name.IndexOf ('.');
401 string first = name.Substring (0, pos);
402 string last = name.Substring (pos + 1);
404 o = Lookup (ds, first, loc);
410 return ns.Lookup (ds, last);
412 Type nested = TypeManager.LookupType ((((Type) o).Name + "." + last));
413 if ((nested == null) || ((ds != null) && !ds.CheckAccessLevel (nested)))
420 // Check whether it's a namespace.
422 o = NS.Lookup (ds, name);
429 AliasEntry entry = GetAliasEntry (name);
431 o = entry.Resolve ();
437 // Check using entries.
439 Type t = null, match = null;
440 foreach (Namespace using_ns in GetUsingTable ()) {
441 match = using_ns.Lookup (ds, name) as Type;
444 DeclSpace.Error_AmbiguousTypeReference (loc, name, t, match);
455 // Our cached computation.
456 Namespace [] namespace_using_table;
457 public Namespace[] GetUsingTable ()
459 if (namespace_using_table != null)
460 return namespace_using_table;
462 if (using_clauses == null)
463 return new Namespace [0];
465 ArrayList list = new ArrayList (using_clauses.Count);
467 foreach (UsingEntry ue in using_clauses) {
468 Namespace using_ns = ue.Resolve ();
469 if (using_ns == null)
475 namespace_using_table = new Namespace [list.Count];
476 list.CopyTo (namespace_using_table, 0);
477 return namespace_using_table;
480 public void DefineNamespace (SymbolWriter symwriter)
485 parent.DefineNamespace (symwriter);
488 if (using_clauses != null) {
489 using_list = new string [using_clauses.Count];
490 for (int i = 0; i < using_clauses.Count; i++)
491 using_list [i] = ((UsingEntry) using_clauses [i]).Name;
493 using_list = new string [0];
496 int parent_id = parent != null ? parent.symfile_id : 0;
497 symfile_id = symwriter.DefineNamespace (ns.Name, file, using_list, parent_id);
500 public int SymbolFileID {
506 static void Msgtry (string s)
508 Console.WriteLine (" Try using -r:" + s);
511 protected void error246 (Location loc, string name)
513 if (TypeManager.LookupType (name) != null)
514 Report.Error (138, loc, "The using keyword only lets you specify a namespace, " +
515 "`" + name + "' is a class not a namespace.");
517 Report.Error (246, loc, "The namespace `" + name +
518 "' can not be found (missing assembly reference?)");
521 case "Gtk": case "GtkSharp":
522 Msgtry ("gtk-sharp");
525 case "Gdk": case "GdkSharp":
526 Msgtry ("gdk-sharp");
529 case "Glade": case "GladeSharp":
530 Msgtry ("glade-sharp");
533 case "System.Drawing":
534 Msgtry ("System.Drawing");
537 case "System.Web.Services":
538 Msgtry ("System.Web.Services");
542 Msgtry ("System.Web");
546 Msgtry ("System.Data");
549 case "System.Windows.Forms":
550 Msgtry ("System.Windows.Forms");
557 /// Used to validate that all the using clauses are correct
558 /// after we are finished parsing all the files.
560 public void VerifyUsing ()
562 if (using_clauses != null){
563 foreach (UsingEntry ue in using_clauses){
564 if (ue.Resolve () != null)
567 error246 (ue.Location, ue.Name);
571 if (aliases != null){
572 foreach (DictionaryEntry de in aliases){
573 AliasEntry alias = (AliasEntry) de.Value;
575 if (alias.Resolve () != null)
578 error246 (alias.Location, alias.Alias);
583 public override string ToString ()
585 if (NS == Namespace.Root)
586 return "NamespaceEntry (<root>)";
588 return String.Format ("NamespaceEntry ({0},{1},{2})", FullName, IsImplicit, ID);