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 ();
23 string name, fullname;
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)
38 string pname = parent != null ? parent.Name : "";
43 fullname = parent.Name + "." + name;
45 entries = new ArrayList ();
46 namespaces = new Hashtable ();
47 defined_names = new Hashtable ();
49 all_namespaces.Add (this);
50 if (namespaces_map.Contains (fullname))
52 namespaces_map [fullname] = true;
55 public static bool IsNamespace (string name)
57 return namespaces_map [name] != null;
60 public static Namespace Root = new Namespace (null, "");
62 public Namespace GetNamespace (string name, bool create)
64 int pos = name.IndexOf ('.');
69 first = name.Substring (0, pos);
73 ns = (Namespace) namespaces [first];
78 ns = new Namespace (this, first);
79 namespaces.Add (first, ns);
83 ns = ns.GetNamespace (name.Substring (pos + 1), create);
88 public static Namespace LookupNamespace (string name, bool create)
90 return Root.GetNamespace (name, create);
93 public object Lookup (DeclSpace ds, string name)
95 object o = Lookup (name);
98 DeclSpace tdecl = o as DeclSpace;
100 t = tdecl.DefineType ();
102 if ((ds == null) || ds.CheckAccessLevel (t))
106 Namespace ns = GetNamespace (name, false);
110 t = TypeManager.LookupType (DeclSpace.MakeFQN (fullname, name));
111 if ((t == null) || ((ds != null) && !ds.CheckAccessLevel (t)))
117 public void AddNamespaceEntry (NamespaceEntry entry)
122 public void DefineName (string name, object o)
124 defined_names.Add (name, o);
127 public object Lookup (string name)
129 return defined_names [name];
132 static public ArrayList UserDefinedNamespaces {
134 return all_namespaces;
139 /// The qualified name of the current namespace
148 /// The parent of this namespace, used by the parser to "Pop"
149 /// the current namespace declaration
151 public Namespace Parent {
157 public static void DefineNamespaces (SymbolWriter symwriter)
159 foreach (Namespace ns in all_namespaces) {
160 foreach (NamespaceEntry entry in ns.entries)
161 entry.DefineNamespace (symwriter);
166 /// Used to validate that all the using clauses are correct
167 /// after we are finished parsing all the files.
169 public static void VerifyUsing ()
171 foreach (Namespace ns in all_namespaces) {
172 foreach (NamespaceEntry entry in ns.entries)
173 entry.VerifyUsing ();
177 public override string ToString ()
180 return "Namespace (<root>)";
182 return String.Format ("Namespace ({0})", Name);
186 public class NamespaceEntry
189 NamespaceEntry parent, implicit_parent;
193 ArrayList using_clauses;
194 public bool DeclarationFound = false;
197 // This class holds the location where a using definition is
198 // done, and whether it has been used by the program or not.
200 // We use this to flag using clauses for namespaces that do not
203 public class UsingEntry {
204 public readonly string Name;
205 public readonly NamespaceEntry NamespaceEntry;
206 public readonly Location Location;
208 public UsingEntry (NamespaceEntry entry, string name, Location loc)
211 NamespaceEntry = entry;
215 Namespace resolved_ns;
217 public Namespace Resolve ()
219 if (resolved_ns != null)
222 Namespace curr_ns = NamespaceEntry.NS;
223 while ((curr_ns != null) && (resolved_ns == null)) {
224 resolved_ns = curr_ns.GetNamespace (Name, false);
226 if (resolved_ns == null)
227 curr_ns = curr_ns.Parent;
234 public class AliasEntry {
235 public readonly string Name;
236 public readonly string Alias;
237 public readonly NamespaceEntry NamespaceEntry;
238 public readonly Location Location;
240 public AliasEntry (NamespaceEntry entry, string name, string alias, Location loc)
244 NamespaceEntry = entry;
250 public object Resolve ()
252 if (resolved != null)
255 NamespaceEntry curr_ns = NamespaceEntry;
256 while ((curr_ns != null) && (resolved == null)) {
257 resolved = curr_ns.Lookup (null, Alias, Location);
259 if (resolved == null)
260 curr_ns = curr_ns.Parent;
267 public NamespaceEntry (NamespaceEntry parent, SourceFile file, string name, Location loc)
268 : this (parent, file, name, false, loc)
271 protected NamespaceEntry (NamespaceEntry parent, SourceFile file, string name, bool is_implicit, Location loc)
273 this.parent = parent;
275 this.IsImplicit = is_implicit;
278 if (!is_implicit && (parent != null))
279 ns = parent.NS.GetNamespace (name, true);
280 else if (name != null)
281 ns = Namespace.LookupNamespace (name, true);
284 ns.AddNamespaceEntry (this);
286 if ((parent != null) && (parent.NS != ns.Parent))
287 implicit_parent = new NamespaceEntry (parent, file, ns.Parent.Name, true, loc);
289 implicit_parent = parent;
291 this.FullName = ns.Name;
294 static int next_id = 0;
295 public readonly string FullName;
296 public readonly int ID;
297 public readonly bool IsImplicit;
299 public Namespace NS {
305 public NamespaceEntry Parent {
311 public NamespaceEntry ImplicitParent {
313 return implicit_parent;
317 public void DefineName (string name, object o)
319 ns.DefineName (name, o);
323 /// Records a new namespace for resolving name references
325 public void Using (string ns, Location loc)
327 if (DeclarationFound){
328 Report.Error (1529, loc, "A using clause must precede all other namespace elements");
335 if (using_clauses == null)
336 using_clauses = new ArrayList ();
338 foreach (UsingEntry old_entry in using_clauses){
339 if (old_entry.Name == ns){
340 Report.Warning (105, loc, "The using directive for '" + ns +
341 "' appeared previously in this namespace");
346 UsingEntry ue = new UsingEntry (this, ns, loc);
347 using_clauses.Add (ue);
350 public void UsingAlias (string alias, string namespace_or_type, Location loc)
353 aliases = new Hashtable ();
355 if (aliases.Contains (alias)){
356 Report.Error (1537, loc, "The using alias `" + alias +
357 "' appeared previously in this namespace");
361 aliases [alias] = new AliasEntry (this, alias, namespace_or_type, loc);
364 protected AliasEntry GetAliasEntry (string alias)
366 AliasEntry entry = null;
369 entry = (AliasEntry) aliases [alias];
370 if (entry == null && Parent != null)
371 entry = Parent.GetAliasEntry (alias);
376 public string LookupAlias (string alias)
378 AliasEntry entry = GetAliasEntry (alias);
383 object resolved = entry.Resolve ();
384 if (resolved == null)
386 else if (resolved is Namespace)
387 return ((Namespace) resolved).Name;
389 return ((Type) resolved).FullName;
392 public object Lookup (DeclSpace ds, string name, Location loc)
398 // If name is of the form `N.I', first lookup `N', then search a member `I' in it.
400 int pos = name.IndexOf ('.');
402 string first = name.Substring (0, pos);
403 string last = name.Substring (pos + 1);
405 o = Lookup (ds, first, loc);
411 return ns.Lookup (ds, last);
413 Type nested = TypeManager.LookupType ((((Type) o).Name + "." + last));
414 if ((nested == null) || ((ds != null) && !ds.CheckAccessLevel (nested)))
421 // Check whether it's a namespace.
423 o = NS.Lookup (ds, name);
430 AliasEntry entry = GetAliasEntry (name);
432 o = entry.Resolve ();
438 // Check using entries.
440 Type t = null, match = null;
441 foreach (Namespace using_ns in GetUsingTable ()) {
442 match = using_ns.Lookup (ds, name) as Type;
445 DeclSpace.Error_AmbiguousTypeReference (loc, name, t, match);
456 // Our cached computation.
457 Namespace [] namespace_using_table;
458 public Namespace[] GetUsingTable ()
460 if (namespace_using_table != null)
461 return namespace_using_table;
463 if (using_clauses == null)
464 return new Namespace [0];
466 ArrayList list = new ArrayList (using_clauses.Count);
468 foreach (UsingEntry ue in using_clauses) {
469 Namespace using_ns = ue.Resolve ();
470 if (using_ns == null)
476 namespace_using_table = new Namespace [list.Count];
477 list.CopyTo (namespace_using_table, 0);
478 return namespace_using_table;
481 public void DefineNamespace (SymbolWriter symwriter)
486 parent.DefineNamespace (symwriter);
489 if (using_clauses != null) {
490 using_list = new string [using_clauses.Count];
491 for (int i = 0; i < using_clauses.Count; i++)
492 using_list [i] = ((UsingEntry) using_clauses [i]).Name;
494 using_list = new string [0];
497 int parent_id = parent != null ? parent.symfile_id : 0;
498 symfile_id = symwriter.DefineNamespace (ns.Name, file, using_list, parent_id);
501 public int SymbolFileID {
507 static void Msgtry (string s)
509 Console.WriteLine (" Try using -r:" + s);
512 protected void error246 (Location loc, string name)
514 if (TypeManager.LookupType (name) != null)
515 Report.Error (138, loc, "The using keyword only lets you specify a namespace, " +
516 "`" + name + "' is a class not a namespace.");
518 Report.Error (246, loc, "The namespace `" + name +
519 "' can not be found (missing assembly reference?)");
522 case "Gtk": case "GtkSharp":
523 Msgtry ("gtk-sharp");
526 case "Gdk": case "GdkSharp":
527 Msgtry ("gdk-sharp");
530 case "Glade": case "GladeSharp":
531 Msgtry ("glade-sharp");
534 case "System.Drawing":
535 Msgtry ("System.Drawing");
538 case "System.Web.Services":
539 Msgtry ("System.Web.Services");
543 Msgtry ("System.Web");
547 Msgtry ("System.Data");
550 case "System.Windows.Forms":
551 Msgtry ("System.Windows.Forms");
558 /// Used to validate that all the using clauses are correct
559 /// after we are finished parsing all the files.
561 public void VerifyUsing ()
563 if (using_clauses != null){
564 foreach (UsingEntry ue in using_clauses){
565 if (ue.Resolve () != null)
568 error246 (ue.Location, ue.Name);
572 if (aliases != null){
573 foreach (DictionaryEntry de in aliases){
574 AliasEntry alias = (AliasEntry) de.Value;
576 if (alias.Resolve () != null)
579 error246 (alias.Location, alias.Alias);
584 public override string ToString ()
586 if (NS == Namespace.Root)
587 return "NamespaceEntry (<root>)";
589 return String.Format ("NamespaceEntry ({0},{1},{2})", FullName, IsImplicit, ID);