//
// namespace.cs: Tracks namespaces
//
// Author:
// Miguel de Icaza (miguel@ximian.com)
//
// (C) 2001 Ximian, Inc.
//
using System;
using System.Collections;
namespace Mono.CSharp {
///
/// Keeps track of the namespaces defined in the C# code.
///
public class Namespace {
static ArrayList all_namespaces = new ArrayList ();
static Hashtable namespaces_map = new Hashtable ();
Namespace parent;
string fullname;
ArrayList entries;
Hashtable namespaces;
Hashtable defined_names;
///
/// Constructor Takes the current namespace and the
/// name. This is bootstrapped with parent == null
/// and name = ""
///
public Namespace (Namespace parent, string name)
{
this.parent = parent;
string pname = parent != null ? parent.Name : "";
if (pname == "")
fullname = name;
else
fullname = parent.Name + "." + name;
entries = new ArrayList ();
namespaces = new Hashtable ();
defined_names = new Hashtable ();
all_namespaces.Add (this);
if (namespaces_map.Contains (fullname))
return;
namespaces_map [fullname] = true;
}
public static bool IsNamespace (string name)
{
return namespaces_map [name] != null;
}
public static Namespace Root = new Namespace (null, "");
public Namespace GetNamespace (string name, bool create)
{
int pos = name.IndexOf ('.');
Namespace ns;
string first;
if (pos >= 0)
first = name.Substring (0, pos);
else
first = name;
ns = (Namespace) namespaces [first];
if (ns == null) {
if (!create)
return null;
ns = new Namespace (this, first);
namespaces.Add (first, ns);
}
if (pos >= 0)
ns = ns.GetNamespace (name.Substring (pos + 1), create);
return ns;
}
public static Namespace LookupNamespace (string name, bool create)
{
return Root.GetNamespace (name, create);
}
public object Lookup (DeclSpace ds, string name)
{
object o = Lookup (name);
Type t;
DeclSpace tdecl = o as DeclSpace;
if (tdecl != null) {
t = tdecl.DefineType ();
if ((ds == null) || ds.CheckAccessLevel (t))
return t;
}
Namespace ns = GetNamespace (name, false);
if (ns != null)
return ns;
t = TypeManager.LookupType (DeclSpace.MakeFQN (fullname, name));
if ((t == null) || ((ds != null) && !ds.CheckAccessLevel (t)))
return null;
return t;
}
public void AddNamespaceEntry (NamespaceEntry entry)
{
entries.Add (entry);
}
public void DefineName (string name, object o)
{
defined_names.Add (name, o);
}
public object Lookup (string name)
{
return defined_names [name];
}
static public ArrayList UserDefinedNamespaces {
get {
return all_namespaces;
}
}
///
/// The qualified name of the current namespace
///
public string Name {
get {
return fullname;
}
}
///
/// The parent of this namespace, used by the parser to "Pop"
/// the current namespace declaration
///
public Namespace Parent {
get {
return parent;
}
}
public static void DefineNamespaces (SymbolWriter symwriter)
{
foreach (Namespace ns in all_namespaces) {
foreach (NamespaceEntry entry in ns.entries)
entry.DefineNamespace (symwriter);
}
}
///
/// Used to validate that all the using clauses are correct
/// after we are finished parsing all the files.
///
public static void VerifyUsing ()
{
foreach (Namespace ns in all_namespaces) {
foreach (NamespaceEntry entry in ns.entries)
entry.VerifyUsing ();
}
}
public override string ToString ()
{
if (this == Root)
return "Namespace ()";
else
return String.Format ("Namespace ({0})", Name);
}
}
public class NamespaceEntry
{
Namespace ns;
NamespaceEntry parent, implicit_parent;
SourceFile file;
int symfile_id;
Hashtable aliases;
ArrayList using_clauses;
public bool DeclarationFound = false;
//
// This class holds the location where a using definition is
// done, and whether it has been used by the program or not.
//
// We use this to flag using clauses for namespaces that do not
// exist.
//
public class UsingEntry {
public readonly string Name;
public readonly NamespaceEntry NamespaceEntry;
public readonly Location Location;
public UsingEntry (NamespaceEntry entry, string name, Location loc)
{
Name = name;
NamespaceEntry = entry;
Location = loc;
}
Namespace resolved_ns;
public Namespace Resolve ()
{
if (resolved_ns != null)
return resolved_ns;
Namespace curr_ns = NamespaceEntry.NS;
while ((curr_ns != null) && (resolved_ns == null)) {
resolved_ns = curr_ns.GetNamespace (Name, false);
if (resolved_ns == null)
curr_ns = curr_ns.Parent;
}
return resolved_ns;
}
}
public class AliasEntry {
public readonly string Name;
public readonly Expression Alias;
public readonly NamespaceEntry NamespaceEntry;
public readonly Location Location;
public AliasEntry (NamespaceEntry entry, string name, Expression alias, Location loc)
{
Name = name;
Alias = alias;
NamespaceEntry = entry;
Location = loc;
}
object resolved;
public object Resolve ()
{
if (resolved != null)
return resolved;
NamespaceEntry curr_ns = NamespaceEntry;
string alias = Alias.ToString ();
while ((curr_ns != null) && (resolved == null)) {
resolved = curr_ns.Lookup (null, alias, false, Location);
if (resolved == null)
curr_ns = curr_ns.Parent;
}
return resolved;
}
}
public NamespaceEntry (NamespaceEntry parent, SourceFile file, string name, Location loc)
: this (parent, file, name, false, loc)
{ }
protected NamespaceEntry (NamespaceEntry parent, SourceFile file, string name, bool is_implicit, Location loc)
{
this.parent = parent;
this.file = file;
this.IsImplicit = is_implicit;
this.ID = ++next_id;
if (!is_implicit && (parent != null))
ns = parent.NS.GetNamespace (name, true);
else if (name != null)
ns = Namespace.LookupNamespace (name, true);
else
ns = Namespace.Root;
ns.AddNamespaceEntry (this);
if ((parent != null) && (parent.NS != ns.Parent))
implicit_parent = new NamespaceEntry (parent, file, ns.Parent.Name, true, loc);
else
implicit_parent = parent;
this.FullName = ns.Name;
}
static int next_id = 0;
public readonly string FullName;
public readonly int ID;
public readonly bool IsImplicit;
public Namespace NS {
get {
return ns;
}
}
public NamespaceEntry Parent {
get {
return parent;
}
}
public NamespaceEntry ImplicitParent {
get {
return implicit_parent;
}
}
public void DefineName (string name, object o)
{
ns.DefineName (name, o);
}
///
/// Records a new namespace for resolving name references
///
public void Using (string ns, Location loc)
{
if (DeclarationFound){
Report.Error (1529, loc, "A using clause must precede all other namespace elements");
return;
}
if (ns == FullName)
return;
if (using_clauses == null)
using_clauses = new ArrayList ();
foreach (UsingEntry old_entry in using_clauses){
if (old_entry.Name == ns){
Report.Warning (105, loc, "The using directive for '" + ns +
"' appeared previously in this namespace");
return;
}
}
UsingEntry ue = new UsingEntry (this, ns, loc);
using_clauses.Add (ue);
}
public void UsingAlias (string alias, Expression namespace_or_type, Location loc)
{
if (DeclarationFound){
Report.Error (1529, loc, "A using clause must precede all other namespace elements");
return;
}
if (aliases == null)
aliases = new Hashtable ();
if (aliases.Contains (alias)){
Report.Error (1537, loc, "The using alias `" + alias +
"' appeared previously in this namespace");
return;
}
aliases [alias] = new AliasEntry (this, alias, namespace_or_type, loc);
}
protected AliasEntry GetAliasEntry (string alias)
{
AliasEntry entry = null;
if (aliases != null)
entry = (AliasEntry) aliases [alias];
if (entry == null && Parent != null)
entry = Parent.GetAliasEntry (alias);
return entry;
}
public string LookupAlias (string alias)
{
AliasEntry entry = GetAliasEntry (alias);
if (entry == null)
return null;
object resolved = entry.Resolve ();
if (resolved == null)
return null;
else if (resolved is Namespace)
return ((Namespace) resolved).Name;
else
return ((Type) resolved).FullName;
}
public object Lookup (DeclSpace ds, string name, bool silent, Location loc)
{
object o;
Namespace ns;
//
// If name is of the form `N.I', first lookup `N', then search a member `I' in it.
//
int pos = name.IndexOf ('.');
if (pos >= 0) {
string first = name.Substring (0, pos);
string last = name.Substring (pos + 1);
o = Lookup (ds, first, silent, loc);
if (o == null)
return null;
ns = o as Namespace;
if (ns != null)
return ns.Lookup (ds, last);
Type nested = TypeManager.LookupType ((((Type) o).Name + "." + last));
if ((nested == null) || ((ds != null) && !ds.CheckAccessLevel (nested)))
return null;
return nested;
}
//
// Check whether it's a namespace.
//
o = NS.Lookup (ds, name);
if (o != null)
return o;
//
// Check aliases.
//
AliasEntry entry = GetAliasEntry (name);
if (entry != null) {
o = entry.Resolve ();
if (o != null)
return o;
}
if (name.IndexOf ('.') > 0)
return null;
//
// Check using entries.
//
Type t = null, match = null;
foreach (Namespace using_ns in GetUsingTable ()) {
match = using_ns.Lookup (ds, name) as Type;
if (match != null){
if (t != null) {
if (!silent)
DeclSpace.Error_AmbiguousTypeReference (loc, name, t, match);
return null;
} else {
t = match;
}
}
}
return t;
}
// Our cached computation.
Namespace [] namespace_using_table;
public Namespace[] GetUsingTable ()
{
if (namespace_using_table != null)
return namespace_using_table;
if (using_clauses == null)
return new Namespace [0];
ArrayList list = new ArrayList (using_clauses.Count);
foreach (UsingEntry ue in using_clauses) {
Namespace using_ns = ue.Resolve ();
if (using_ns == null)
continue;
list.Add (using_ns);
}
namespace_using_table = new Namespace [list.Count];
list.CopyTo (namespace_using_table, 0);
return namespace_using_table;
}
public void DefineNamespace (SymbolWriter symwriter)
{
if (symfile_id != 0)
return;
if (parent != null)
parent.DefineNamespace (symwriter);
string[] using_list;
if (using_clauses != null) {
using_list = new string [using_clauses.Count];
for (int i = 0; i < using_clauses.Count; i++)
using_list [i] = ((UsingEntry) using_clauses [i]).Name;
} else {
using_list = new string [0];
}
int parent_id = parent != null ? parent.symfile_id : 0;
symfile_id = symwriter.DefineNamespace (ns.Name, file, using_list, parent_id);
}
public int SymbolFileID {
get {
return symfile_id;
}
}
static void Msgtry (string s)
{
Console.WriteLine (" Try using -r:" + s);
}
protected void error246 (Location loc, string name)
{
if (TypeManager.LookupType (name) != null)
Report.Error (138, loc, "The using keyword only lets you specify a namespace, " +
"`" + name + "' is a class not a namespace.");
else {
Report.Error (246, loc, "The namespace `" + name +
"' can not be found (missing assembly reference?)");
switch (name){
case "Gtk": case "GtkSharp":
Msgtry ("gtk-sharp");
break;
case "Gdk": case "GdkSharp":
Msgtry ("gdk-sharp");
break;
case "Glade": case "GladeSharp":
Msgtry ("glade-sharp");
break;
case "System.Drawing":
Msgtry ("System.Drawing");
break;
case "System.Web.Services":
Msgtry ("System.Web.Services");
break;
case "System.Web":
Msgtry ("System.Web");
break;
case "System.Data":
Msgtry ("System.Data");
break;
case "System.Windows.Forms":
Msgtry ("System.Windows.Forms");
break;
}
}
}
///
/// Used to validate that all the using clauses are correct
/// after we are finished parsing all the files.
///
public void VerifyUsing ()
{
if (using_clauses != null){
foreach (UsingEntry ue in using_clauses){
if (ue.Resolve () != null)
continue;
error246 (ue.Location, ue.Name);
}
}
if (aliases != null){
foreach (DictionaryEntry de in aliases){
AliasEntry alias = (AliasEntry) de.Value;
if (alias.Resolve () != null)
continue;
error246 (alias.Location, alias.Alias.ToString ());
}
}
}
public override string ToString ()
{
if (NS == Namespace.Root)
return "NamespaceEntry ()";
else
return String.Format ("NamespaceEntry ({0},{1},{2})", FullName, IsImplicit, ID);
}
}
}