//
// namespace.cs: Tracks namespaces
//
// Author:
// Miguel de Icaza (miguel@ximian.com)
// Marek Safar (marek.safar@seznam.cz)
//
// (C) 2001 Ximian, Inc.
//
using System;
using System.Collections;
using System.Collections.Specialized;
using System.Reflection;
namespace Mono.CSharp {
public class RootNamespace : Namespace {
static MethodInfo get_namespaces_method;
string alias_name;
Assembly referenced_assembly;
Hashtable all_namespaces;
static Hashtable root_namespaces;
public static GlobalRootNamespace Global;
static RootNamespace ()
{
get_namespaces_method = typeof (Assembly).GetMethod ("GetNamespaces", BindingFlags.Instance | BindingFlags.NonPublic);
Reset ();
}
public static void Reset ()
{
root_namespaces = new Hashtable ();
Global = new GlobalRootNamespace ();
root_namespaces ["global"] = Global;
}
protected RootNamespace (string alias_name, Assembly assembly)
: base (null, String.Empty)
{
this.alias_name = alias_name;
referenced_assembly = assembly;
all_namespaces = new Hashtable ();
all_namespaces.Add ("", this);
if (referenced_assembly != null)
ComputeNamespaces (this.referenced_assembly);
}
public static void DefineRootNamespace (string name, Assembly assembly)
{
if (name == "global") {
NamespaceEntry.Error_GlobalNamespaceRedefined (Location.Null);
return;
}
RootNamespace retval = GetRootNamespace (name);
if (retval == null || retval.referenced_assembly != assembly)
root_namespaces [name] = new RootNamespace (name, assembly);
}
public static RootNamespace GetRootNamespace (string name)
{
return (RootNamespace) root_namespaces [name];
}
public virtual Type LookupTypeReflection (string name, Location loc)
{
return GetTypeInAssembly (referenced_assembly, name);
}
public void RegisterNamespace (Namespace child)
{
if (child != this)
all_namespaces.Add (child.Name, child);
}
public bool IsNamespace (string name)
{
return all_namespaces.Contains (name);
}
protected void RegisterNamespace (string dotted_name)
{
if (dotted_name != null && dotted_name.Length != 0 && ! IsNamespace (dotted_name))
GetNamespace (dotted_name, true);
}
void RegisterExtensionMethodClass (Type t)
{
string n = t.Namespace;
Namespace ns = n == null ? Global : (Namespace)all_namespaces [n];
if (ns == null)
ns = GetNamespace (n, true);
ns.RegisterExternalExtensionMethodClass (t);
}
protected void ComputeNamespaces (Assembly assembly)
{
// How to test whether attribute exists without loading the assembly :-(
const string SystemCore = "System.Core, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089";
if (TypeManager.extension_attribute_type == null &&
assembly.FullName == SystemCore) {
TypeManager.extension_attribute_type = assembly.GetType("System.Runtime.CompilerServices.ExtensionAttribute");
}
bool contains_extension_methods = TypeManager.extension_attribute_type != null &&
assembly.IsDefined(TypeManager.extension_attribute_type, false);
if (get_namespaces_method != null && !contains_extension_methods) {
string [] namespaces = (string []) get_namespaces_method.Invoke (assembly, null);
foreach (string ns in namespaces)
RegisterNamespace (ns);
return;
}
foreach (Type t in assembly.GetExportedTypes ()) {
if ((t.Attributes & Class.StaticClassAttribute) == Class.StaticClassAttribute &&
contains_extension_methods && t.IsDefined (TypeManager.extension_attribute_type, false))
RegisterExtensionMethodClass (t);
else
RegisterNamespace (t.Namespace);
}
}
protected static Type GetTypeInAssembly (Assembly assembly, string name)
{
Type t = assembly.GetType (name);
if (t == null)
return null;
if (t.IsPointer)
throw new InternalErrorException ("Use GetPointerType() to get a pointer");
TypeAttributes ta = t.Attributes & TypeAttributes.VisibilityMask;
if (ta == TypeAttributes.NestedPrivate)
return null;
if ((ta == TypeAttributes.NotPublic ||
ta == TypeAttributes.NestedAssembly ||
ta == TypeAttributes.NestedFamANDAssem) &&
!TypeManager.IsFriendAssembly (t.Assembly))
return null;
return t;
}
public override string ToString ()
{
return String.Format ("RootNamespace ({0}::)", alias_name);
}
public override string GetSignatureForError ()
{
return alias_name + "::";
}
}
public class GlobalRootNamespace : RootNamespace {
Assembly [] assemblies;
Module [] modules;
public GlobalRootNamespace ()
: base ("global", null)
{
assemblies = new Assembly [0];
}
public Assembly [] Assemblies {
get { return assemblies; }
}
public Module [] Modules {
get { return modules; }
}
public void AddAssemblyReference (Assembly a)
{
foreach (Assembly assembly in assemblies) {
if (a == assembly)
return;
}
int top = assemblies.Length;
Assembly [] n = new Assembly [top + 1];
assemblies.CopyTo (n, 0);
n [top] = a;
assemblies = n;
ComputeNamespaces (a);
}
public void AddModuleReference (Module m)
{
int top = modules != null ? modules.Length : 0;
Module [] n = new Module [top + 1];
if (modules != null)
modules.CopyTo (n, 0);
n [top] = m;
modules = n;
if (m == CodeGen.Module.Builder)
return;
foreach (Type t in m.GetTypes ())
RegisterNamespace (t.Namespace);
}
public override void Error_NamespaceDoesNotExist(DeclSpace ds, Location loc, string name)
{
Report.Error (400, loc, "The type or namespace name `{0}' could not be found in the global namespace (are you missing an assembly reference?)",
name);
}
public override Type LookupTypeReflection (string name, Location loc)
{
Type found_type = null;
foreach (Assembly a in assemblies) {
Type t = GetTypeInAssembly (a, name);
if (t == null)
continue;
if (found_type == null) {
found_type = t;
continue;
}
Report.SymbolRelatedToPreviousError (found_type);
Report.SymbolRelatedToPreviousError (t);
Report.Error (433, loc, "The imported type `{0}' is defined multiple times", name);
return found_type;
}
if (modules != null) {
foreach (Module module in modules) {
Type t = module.GetType (name);
if (t == null)
continue;
if (found_type == null) {
found_type = t;
continue;
}
Report.SymbolRelatedToPreviousError (found_type);
if (loc.IsNull) {
DeclSpace ds = TypeManager.LookupDeclSpace (t);
Report.Warning (1685, 1, ds.Location, "The type `{0}' conflicts with the predefined type `{1}' and will be ignored",
ds.GetSignatureForError (), TypeManager.CSharpName (found_type));
return found_type;
}
Report.SymbolRelatedToPreviousError (t);
Report.Warning (436, 2, loc, "The type `{0}' conflicts with the imported type `{1}'. Ignoring the imported type definition",
TypeManager.CSharpName (t), TypeManager.CSharpName (found_type));
return t;
}
}
return found_type;
}
}
///
/// Keeps track of the namespaces defined in the C# code.
///
/// This is an Expression to allow it to be referenced in the
/// compiler parse/intermediate tree during name resolution.
///
public class Namespace : FullNamedExpression {
Namespace parent;
string fullname;
IDictionary namespaces;
IDictionary declspaces;
Hashtable cached_types;
RootNamespace root;
ArrayList external_exmethod_classes;
public readonly MemberName MemberName;
///
/// Constructor Takes the current namespace and the
/// name. This is bootstrapped with parent == null
/// and name = ""
///
public Namespace (Namespace parent, string name)
{
// Expression members.
this.eclass = ExprClass.Namespace;
this.Type = typeof (Namespace);
this.loc = Location.Null;
this.parent = parent;
if (parent != null)
this.root = parent.root;
else
this.root = this as RootNamespace;
if (this.root == null)
throw new InternalErrorException ("Root namespaces must be created using RootNamespace");
string pname = parent != null ? parent.Name : "";
if (pname == "")
fullname = name;
else
fullname = parent.Name + "." + name;
if (fullname == null)
throw new InternalErrorException ("Namespace has a null fullname");
if (parent != null && parent.MemberName != MemberName.Null)
MemberName = new MemberName (parent.MemberName, name);
else if (name.Length == 0)
MemberName = MemberName.Null;
else
MemberName = new MemberName (name);
namespaces = new HybridDictionary ();
cached_types = new Hashtable ();
root.RegisterNamespace (this);
}
public override Expression DoResolve (EmitContext ec)
{
return this;
}
public virtual void Error_NamespaceDoesNotExist (DeclSpace ds, Location loc, string name)
{
if (name.IndexOf ('`') > 0) {
FullNamedExpression retval = Lookup (ds, SimpleName.RemoveGenericArity (name), loc);
if (retval != null) {
Error_TypeArgumentsCannotBeUsed (retval.Type, loc, "type");
return;
}
} else {
Type t = LookForAnyGenericType (name);
if (t != null) {
Error_InvalidNumberOfTypeArguments (t, loc);
return;
}
}
Report.Error (234, loc, "The type or namespace name `{0}' does not exist in the namespace `{1}'. Are you missing an assembly reference?",
name, FullName);
}
public static void Error_InvalidNumberOfTypeArguments (Type t, Location loc)
{
Report.SymbolRelatedToPreviousError (t);
Report.Error (305, loc, "Using the generic type `{0}' requires `{1}' type argument(s)",
TypeManager.CSharpName(t), TypeManager.GetNumberOfTypeArguments(t).ToString());
}
public static void Error_TypeArgumentsCannotBeUsed(Type t, Location loc, string symbol)
{
Report.SymbolRelatedToPreviousError(t);
Report.Error(308, loc, "The non-generic {0} `{1}' cannot be used with the type arguments",
symbol, TypeManager.CSharpName(t));
}
public override void Emit (EmitContext ec)
{
throw new InternalErrorException ("Expression tree referenced namespace " + fullname + " during Emit ()");
}
public override string GetSignatureForError ()
{
return Name;
}
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;
}
TypeExpr LookupType (string name, Location loc)
{
if (cached_types.Contains (name))
return cached_types [name] as TypeExpr;
Type t = null;
if (declspaces != null) {
DeclSpace tdecl = declspaces [name] as DeclSpace;
if (tdecl != null) {
//
// Note that this is not:
//
// t = tdecl.DefineType ()
//
// This is to make it somewhat more useful when a DefineType
// fails due to problems in nested types (more useful in the sense
// of fewer misleading error messages)
//
tdecl.DefineType ();
t = tdecl.TypeBuilder;
}
}
string lookup = t != null ? t.FullName : (fullname.Length == 0 ? name : fullname + "." + name);
Type rt = root.LookupTypeReflection (lookup, loc);
// HACK: loc.IsNull when the type is core type
if (t == null || (rt != null && loc.IsNull))
t = rt;
TypeExpr te = t == null ? null : new TypeExpression (t, Location.Null);
cached_types [name] = te;
return te;
}
///
/// Used for better error reporting only
///
public Type LookForAnyGenericType (string typeName)
{
if (declspaces == null)
return null;
typeName = SimpleName.RemoveGenericArity (typeName);
foreach (DictionaryEntry de in declspaces) {
string type_item = (string) de.Key;
int pos = type_item.LastIndexOf ('`');
if (pos == typeName.Length && String.Compare (typeName, 0, type_item, 0, pos) == 0)
return ((DeclSpace) de.Value).TypeBuilder;
}
return null;
}
public FullNamedExpression Lookup (DeclSpace ds, string name, Location loc)
{
if (namespaces.Contains (name))
return (Namespace) namespaces [name];
return LookupType (name, loc);
}
public void RegisterExternalExtensionMethodClass (Type type)
{
if (external_exmethod_classes == null)
external_exmethod_classes = new ArrayList ();
external_exmethod_classes.Add (type);
}
///
/// Looks for extension method in this namespace
///
public ArrayList LookupExtensionMethod (Type extensionType, ClassOrStruct currentClass, string name, NamespaceEntry ns)
{
ArrayList found = null;
if (declspaces != null) {
IEnumerator e = declspaces.Values.GetEnumerator ();
e.Reset ();
while (e.MoveNext ()) {
Class c = e.Current as Class;
if (c == null)
continue;
if (!c.IsStaticClass)
continue;
ArrayList res = c.MemberCache.FindExtensionMethods (extensionType, name, c != currentClass);
if (res == null)
continue;
if (found == null)
found = res;
else
found.AddRange (res);
}
}
if (external_exmethod_classes == null)
return found;
foreach (Type t in external_exmethod_classes) {
MemberCache m = TypeHandle.GetMemberCache (t);
ArrayList res = m.FindExtensionMethods (extensionType, name, true);
if (res == null)
continue;
if (found == null)
found = res;
else
found.AddRange (res);
}
return found;
}
public void AddDeclSpace (string name, DeclSpace ds)
{
if (declspaces == null)
declspaces = new HybridDictionary ();
declspaces.Add (name, ds);
}
///
/// The qualified name of the current namespace
///
public string Name {
get { return fullname; }
}
public override string FullName {
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 override string ToString ()
{
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;
bool UsingFound;
public readonly DeclSpace SlaveDeclSpace;
ListDictionary extern_aliases;
static ArrayList entries = new ArrayList ();
public static void Reset ()
{
entries = new ArrayList ();
}
//
// 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 : IResolveContext {
public readonly MemberName Name;
readonly NamespaceEntry NamespaceEntry;
readonly Location Location;
public UsingEntry (NamespaceEntry entry, MemberName name, Location loc)
{
Name = name;
NamespaceEntry = entry;
Location = loc;
}
internal Namespace resolved;
public Namespace Resolve ()
{
if (resolved != null)
return resolved;
FullNamedExpression fne = Name.GetTypeExpression ().ResolveAsTypeStep (this, false);
if (fne == null) {
Error_NamespaceNotFound (Location, Name.ToString ());
return null;
}
resolved = fne as Namespace;
if (resolved == null) {
Report.SymbolRelatedToPreviousError (fne.Type);
Report.Error (138, Location,
"`{0}' is a type not a namespace. A using namespace directive can only be applied to namespaces", Name.ToString ());
}
return resolved;
}
DeclSpace IResolveContext.DeclContainer {
get { return NamespaceEntry.SlaveDeclSpace; }
}
DeclSpace IResolveContext.GenericDeclContainer {
get { return NamespaceEntry.SlaveDeclSpace; }
}
bool IResolveContext.IsInObsoleteScope {
get { return false; }
}
bool IResolveContext.IsInUnsafeScope {
get { return false; }
}
}
public abstract class AliasEntry {
public readonly string Name;
public readonly NamespaceEntry NamespaceEntry;
public readonly Location Location;
protected AliasEntry (NamespaceEntry entry, string name, Location loc)
{
Name = name;
NamespaceEntry = entry;
Location = loc;
}
protected FullNamedExpression resolved;
bool error;
public FullNamedExpression Resolve ()
{
if (resolved != null || error)
return resolved;
resolved = DoResolve ();
if (resolved == null)
error = true;
return resolved;
}
protected abstract FullNamedExpression DoResolve ();
}
public class LocalAliasEntry : AliasEntry, IResolveContext {
public readonly Expression Alias;
public LocalAliasEntry (NamespaceEntry entry, string name, MemberName alias, Location loc) :
base (entry, name, loc)
{
Alias = alias.GetTypeExpression ();
}
protected override FullNamedExpression DoResolve ()
{
resolved = Alias.ResolveAsTypeStep (this, false);
if (resolved == null)
return null;
if (resolved.Type != null) {
TypeAttributes attr = resolved.Type.Attributes & TypeAttributes.VisibilityMask;
if (attr == TypeAttributes.NestedPrivate || attr == TypeAttributes.NestedFamily ||
((attr == TypeAttributes.NestedFamORAssem || attr == TypeAttributes.NestedAssembly) &&
TypeManager.LookupDeclSpace (resolved.Type) == null)) {
Expression.ErrorIsInaccesible (Alias.Location, Alias.ToString ());
return null;
}
}
return resolved;
}
DeclSpace IResolveContext.DeclContainer {
get { return NamespaceEntry.SlaveDeclSpace; }
}
DeclSpace IResolveContext.GenericDeclContainer {
get { return NamespaceEntry.SlaveDeclSpace; }
}
bool IResolveContext.IsInObsoleteScope {
get { return false; }
}
bool IResolveContext.IsInUnsafeScope {
get { return false; }
}
}
public class ExternAliasEntry : AliasEntry {
public ExternAliasEntry (NamespaceEntry entry, string name, Location loc) :
base (entry, name, loc)
{
}
protected override FullNamedExpression DoResolve ()
{
resolved = RootNamespace.GetRootNamespace (Name);
if (resolved == null)
Report.Error (430, Location, "The extern alias '" + Name +
"' was not specified in a /reference option");
return resolved;
}
}
public NamespaceEntry (NamespaceEntry parent, SourceFile file, string name)
{
this.parent = parent;
this.file = file;
entries.Add (this);
this.ID = entries.Count;
if (parent != null)
ns = parent.NS.GetNamespace (name, true);
else if (name != null)
ns = RootNamespace.Global.GetNamespace (name, true);
else
ns = RootNamespace.Global;
SlaveDeclSpace = new RootDeclSpace (this);
}
private NamespaceEntry (NamespaceEntry parent, SourceFile file, Namespace ns, bool slave)
{
this.parent = parent;
this.file = file;
// no need to add self to 'entries', since we don't have any aliases or using entries.
this.ID = -1;
this.IsImplicit = true;
this.ns = ns;
this.SlaveDeclSpace = slave ? new RootDeclSpace (this) : null;
}
//
// According to section 16.3.1 (using-alias-directive), the namespace-or-type-name is
// resolved as if the immediately containing namespace body has no using-directives.
//
// Section 16.3.2 says that the same rule is applied when resolving the namespace-name
// in the using-namespace-directive.
//
// To implement these rules, the expressions in the using directives are resolved using
// the "doppelganger" (ghostly bodiless duplicate).
//
NamespaceEntry doppelganger;
NamespaceEntry Doppelganger {
get {
if (!IsImplicit && doppelganger == null)
doppelganger = new NamespaceEntry (ImplicitParent, file, ns, true);
return doppelganger;
}
}
public readonly int ID;
public readonly bool IsImplicit;
public Namespace NS {
get { return ns; }
}
public NamespaceEntry Parent {
get { return parent; }
}
public NamespaceEntry ImplicitParent {
get {
if (parent == null)
return null;
if (implicit_parent == null) {
implicit_parent = (parent.NS == ns.Parent)
? parent
: new NamespaceEntry (parent, file, ns.Parent, false);
}
return implicit_parent;
}
}
///
/// Records a new namespace for resolving name references
///
public void Using (MemberName name, Location loc)
{
if (DeclarationFound){
Report.Error (1529, loc, "A using clause must precede all other namespace elements except extern alias declarations");
return;
}
UsingFound = true;
if (name.Equals (ns.MemberName))
return;
if (using_clauses == null)
using_clauses = new ArrayList ();
foreach (UsingEntry old_entry in using_clauses) {
if (name.Equals (old_entry.Name)) {
Report.Warning (105, 3, loc, "The using directive for `{0}' appeared previously in this namespace", name.GetName ());
return;
}
}
UsingEntry ue = new UsingEntry (Doppelganger, name, loc);
using_clauses.Add (ue);
}
public void UsingAlias (string name, MemberName alias, Location loc)
{
if (DeclarationFound){
Report.Error (1529, loc, "A using clause must precede all other namespace elements except extern alias declarations");
return;
}
UsingFound = true;
if (aliases == null)
aliases = new Hashtable ();
if (aliases.Contains (name)) {
AliasEntry ae = (AliasEntry) aliases [name];
Report.SymbolRelatedToPreviousError (ae.Location, ae.Name);
Report.Error (1537, loc, "The using alias `{0}' appeared previously in this namespace", name);
return;
}
if (RootContext.Version == LanguageVersion.Default &&
name == "global")
Report.Warning (440, 2, loc, "An alias named `global' will not be used when resolving 'global::';" +
" the global namespace will be used instead");
// FIXME: get correct error number. See if the above check can be merged
if (extern_aliases != null && extern_aliases.Contains (name)) {
AliasEntry ae = (AliasEntry) extern_aliases [name];
Report.SymbolRelatedToPreviousError (ae.Location, ae.Name);
Report.Error (1537, loc, "The using alias `{0}' appeared previously in this namespace", name);
return;
}
aliases [name] = new LocalAliasEntry (Doppelganger, name, alias, loc);
}
public void UsingExternalAlias (string name, Location loc)
{
if (UsingFound || DeclarationFound) {
Report.Error (439, loc, "An extern alias declaration must precede all other elements");
return;
}
// Share the extern_aliases field with the Doppelganger
if (extern_aliases == null) {
extern_aliases = new ListDictionary ();
Doppelganger.extern_aliases = extern_aliases;
}
if (extern_aliases.Contains (name)) {
AliasEntry ae = (AliasEntry) extern_aliases [name];
Report.SymbolRelatedToPreviousError (ae.Location, ae.Name);
Report.Error (1537, loc, "The using alias `{0}' appeared previously in this namespace", name);
return;
}
if (name == "global") {
Error_GlobalNamespaceRedefined (loc);
return;
}
// Register the alias in aliases and extern_aliases, since we need both of them
// to keep things simple (different resolution scenarios)
ExternAliasEntry alias = new ExternAliasEntry (Doppelganger, name, loc);
extern_aliases [name] = alias;
}
///
/// Does extension methods look up to find a method which matches name and extensionType.
/// Search starts from this namespace and continues hierarchically up to top level.
///
public ExtensionMethodGroupExpr LookupExtensionMethod (Type extensionType, ClassOrStruct currentClass, string name)
{
ArrayList candidates = null;
if (currentClass != null) {
candidates = ns.LookupExtensionMethod (extensionType, currentClass, name, this);
if (candidates != null)
return new ExtensionMethodGroupExpr (candidates, this, extensionType, Location.Null);
}
foreach (Namespace n in GetUsingTable ()) {
ArrayList a = n.LookupExtensionMethod (extensionType, null, name, this);
if (a == null)
continue;
if (candidates == null)
candidates = a;
else
candidates.AddRange (a);
}
if (candidates != null)
return new ExtensionMethodGroupExpr (candidates, parent, extensionType, Location.Null);
if (parent == null)
return null;
return parent.LookupExtensionMethod (extensionType, currentClass, name);
}
public FullNamedExpression LookupNamespaceOrType (DeclSpace ds, string name, Location loc, bool ignore_cs0104)
{
// Precondition: Only simple names (no dots) will be looked up with this function.
FullNamedExpression resolved = null;
for (NamespaceEntry curr_ns = this; curr_ns != null; curr_ns = curr_ns.ImplicitParent) {
if ((resolved = curr_ns.Lookup (ds, name, loc, ignore_cs0104)) != null)
break;
}
return resolved;
}
static void Error_AmbiguousTypeReference (Location loc, string name, FullNamedExpression t1, FullNamedExpression t2)
{
Report.SymbolRelatedToPreviousError (t1.Type);
Report.SymbolRelatedToPreviousError (t2.Type);
Report.Error (104, loc, "`{0}' is an ambiguous reference between `{1}' and `{2}'",
name, t1.FullName, t2.FullName);
}
// Looks-up a alias named @name in this and surrounding namespace declarations
public FullNamedExpression LookupAlias (string name)
{
AliasEntry entry = null;
for (NamespaceEntry n = this; n != null; n = n.ImplicitParent) {
if (n.extern_aliases != null && (entry = n.extern_aliases [name] as AliasEntry) != null)
break;
if (n.aliases != null && (entry = n.aliases [name] as AliasEntry) != null)
break;
}
return entry == null ? null : entry.Resolve ();
}
private FullNamedExpression Lookup (DeclSpace ds, string name, Location loc, bool ignore_cs0104)
{
//
// Check whether it's in the namespace.
//
FullNamedExpression fne = ns.Lookup (ds, name, loc);
if (fne != null)
return fne;
if (extern_aliases != null) {
AliasEntry entry = extern_aliases [name] as AliasEntry;
if (entry != null)
return entry.Resolve ();
}
if (IsImplicit)
return null;
//
// Check aliases.
//
if (aliases != null) {
AliasEntry entry = aliases [name] as AliasEntry;
if (entry != null)
return entry.Resolve ();
}
//
// Check using entries.
//
FullNamedExpression match = null;
foreach (Namespace using_ns in GetUsingTable ()) {
match = using_ns.Lookup (ds, name, loc);
if (match == null || !(match is TypeExpr))
continue;
if (fne != null) {
if (!ignore_cs0104)
Error_AmbiguousTypeReference (loc, name, fne, match);
return null;
}
fne = match;
}
return fne;
}
// Our cached computation.
static readonly Namespace [] empty_namespaces = new Namespace [0];
Namespace [] namespace_using_table;
Namespace [] GetUsingTable ()
{
if (namespace_using_table != null)
return namespace_using_table;
if (using_clauses == null) {
namespace_using_table = empty_namespaces;
return namespace_using_table;
}
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;
}
static readonly string [] empty_using_list = new string [0];
public int SymbolFileID {
get {
if (symfile_id == 0 && file.SourceFileEntry != null) {
int parent_id = parent == null ? 0 : parent.SymbolFileID;
string [] using_list = empty_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.ToString ();
}
symfile_id = CodeGen.SymbolWriter.DefineNamespace (ns.Name, file.SourceFileEntry, using_list, parent_id);
}
return symfile_id;
}
}
static void MsgtryRef (string s)
{
Console.WriteLine (" Try using -r:" + s);
}
static void MsgtryPkg (string s)
{
Console.WriteLine (" Try using -pkg:" + s);
}
public static void Error_GlobalNamespaceRedefined (Location loc)
{
Report.Error (1681, loc, "You cannot redefine the global extern alias");
}
public static void Error_NamespaceNotFound (Location loc, string name)
{
Report.Error (246, loc, "The type or namespace name `{0}' could not be found. Are you missing a using directive or an assembly reference?",
name);
switch (name) {
case "Gtk": case "GtkSharp":
MsgtryPkg ("gtk-sharp");
break;
case "Gdk": case "GdkSharp":
MsgtryPkg ("gdk-sharp");
break;
case "Glade": case "GladeSharp":
MsgtryPkg ("glade-sharp");
break;
case "System.Drawing":
case "System.Web.Services":
case "System.Web":
case "System.Data":
case "System.Windows.Forms":
MsgtryRef (name);
break;
}
}
///
/// Used to validate that all the using clauses are correct
/// after we are finished parsing all the files.
///
void VerifyUsing ()
{
if (extern_aliases != null) {
foreach (DictionaryEntry de in extern_aliases)
((AliasEntry) de.Value).Resolve ();
}
if (using_clauses != null) {
foreach (UsingEntry ue in using_clauses)
ue.Resolve ();
}
if (aliases != null) {
foreach (DictionaryEntry de in aliases)
((AliasEntry) de.Value).Resolve ();
}
}
///
/// Used to validate that all the using clauses are correct
/// after we are finished parsing all the files.
///
static public void VerifyAllUsing ()
{
foreach (NamespaceEntry entry in entries)
entry.VerifyUsing ();
}
public string GetSignatureForError ()
{
return ns.GetSignatureForError ();
}
public override string ToString ()
{
return ns.ToString ();
}
}
}