//
// namespace.cs: Tracks namespaces
//
// Author:
// Miguel de Icaza (miguel@ximian.com)
// Marek Safar (marek.safar@seznam.cz)
//
// Copyright 2001 Ximian, Inc.
// Copyright 2003-2008 Novell, Inc.
//
using System;
using System.Collections;
using System.Collections.Specialized;
using System.Reflection;
namespace Mono.CSharp {
class RootNamespace : Namespace {
//
// Points to Mono's GetNamespaces method, an
// optimization when running on Mono to fetch all the
// namespaces in an assembly
//
static MethodInfo get_namespaces_method;
protected readonly string alias_name;
protected Assembly [] referenced_assemblies;
Hashtable all_namespaces;
static RootNamespace ()
{
get_namespaces_method = typeof (Assembly).GetMethod ("GetNamespaces", BindingFlags.Instance | BindingFlags.NonPublic);
}
public RootNamespace (string alias_name)
: base (null, String.Empty)
{
this.alias_name = alias_name;
referenced_assemblies = new Assembly [0];
all_namespaces = new Hashtable ();
all_namespaces.Add ("", this);
}
public void AddAssemblyReference (Assembly a)
{
foreach (Assembly assembly in referenced_assemblies) {
if (a == assembly)
return;
}
int top = referenced_assemblies.Length;
Assembly [] n = new Assembly [top + 1];
referenced_assemblies.CopyTo (n, 0);
n [top] = a;
referenced_assemblies = n;
}
public void ComputeNamespace (Type extensionType)
{
foreach (Assembly a in referenced_assemblies) {
try {
ComputeNamespaces (a, extensionType);
} catch (TypeLoadException e) {
Report.Error (11, Location.Null, e.Message);
} catch (System.IO.FileNotFoundException) {
Report.Error (12, Location.Null, "An assembly `{0}' is used without being referenced",
a.FullName);
}
}
}
public virtual Type LookupTypeReflection (string name, Location loc, bool must_be_unique)
{
Type found_type = null;
foreach (Assembly a in referenced_assemblies) {
Type t = GetTypeInAssembly (a, name);
if (t == null)
continue;
if (!must_be_unique)
return t;
if (found_type == null) {
found_type = t;
continue;
}
// When type is forwarded
if (t.Assembly == found_type.Assembly)
continue;
Report.SymbolRelatedToPreviousError (found_type);
Report.SymbolRelatedToPreviousError (t);
if (loc.IsNull) {
Error_AmbiguousPredefinedType (loc, name, found_type);
} else {
Report.Error (433, loc, "The imported type `{0}' is defined multiple times", name);
}
return found_type;
}
return found_type;
}
//
// Returns the types starting with the given prefix
//
public ICollection CompletionGetTypesStartingWith (string prefix)
{
Hashtable result = null;
foreach (Assembly a in referenced_assemblies){
Type [] mtypes = a.GetTypes ();
foreach (Type t in mtypes){
string f = t.FullName;
if (f.StartsWith (prefix) && (result == null || !result.Contains (f))){
if (result == null)
result = new Hashtable ();
result [f] = f;
}
}
}
return result == null ? result : result.Keys;
}
protected void Error_AmbiguousPredefinedType (Location loc, string name, Type type)
{
Report.Warning (1685, 1, loc,
"The predefined type `{0}' is ambiguous. Using definition from `{1}'",
name, type.Assembly.FullName);
}
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 ? GlobalRootNamespace.Instance : (Namespace) all_namespaces[n];
if (ns == null)
ns = GetNamespace (n, true);
ns.RegisterExternalExtensionMethodClass (t);
}
void ComputeNamespaces (Assembly assembly, Type extensionType)
{
bool contains_extension_methods = extensionType != null && assembly.IsDefined (extensionType, false);
if (get_namespaces_method != null) {
string [] namespaces = (string []) get_namespaces_method.Invoke (assembly, null);
foreach (string ns in namespaces)
RegisterNamespace (ns);
if (!contains_extension_methods)
return;
}
foreach (Type t in assembly.GetTypes ()) {
if ((t.Attributes & Class.StaticClassAttribute) == Class.StaticClassAttribute &&
contains_extension_methods && t.IsDefined (extensionType, false))
RegisterExtensionMethodClass (t);
if (get_namespaces_method == null)
RegisterNamespace (t.Namespace);
}
}
protected static Type GetTypeInAssembly (Assembly assembly, string name)
{
if (assembly == null)
throw new ArgumentNullException ("assembly");
if (name == null)
throw new ArgumentNullException ("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.IsThisOrFriendAssembly (t.Assembly))
return null;
return t;
}
public override string ToString ()
{
return String.Format ("RootNamespace ({0}::)", alias_name);
}
public override string GetSignatureForError ()
{
return alias_name + "::";
}
}
class GlobalRootNamespace : RootNamespace {
Module [] modules;
ListDictionary root_namespaces;
public static GlobalRootNamespace Instance = new GlobalRootNamespace ();
GlobalRootNamespace ()
: base ("global")
{
root_namespaces = new ListDictionary ();
root_namespaces.Add (alias_name, this);
}
public static void Reset ()
{
Instance = new GlobalRootNamespace ();
}
public Assembly [] Assemblies {
get { return referenced_assemblies; }
}
public Module [] Modules {
get { return modules; }
}
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 == RootContext.ToplevelTypes.Builder)
return;
foreach (Type t in m.GetTypes ())
RegisterNamespace (t.Namespace);
}
public void ComputeNamespaces ()
{
//
// Do very early lookup because type is required when we cache
// imported extension types in ComputeNamespaces
//
Type extension_attribute_type = TypeManager.CoreLookupType ("System.Runtime.CompilerServices", "ExtensionAttribute", Kind.Class, false);
foreach (RootNamespace rn in root_namespaces.Values) {
rn.ComputeNamespace (extension_attribute_type);
}
}
public void DefineRootNamespace (string alias, Assembly assembly)
{
if (alias == alias_name) {
NamespaceEntry.Error_GlobalNamespaceRedefined (Location.Null);
return;
}
RootNamespace retval = GetRootNamespace (alias);
if (retval == null) {
retval = new RootNamespace (alias);
root_namespaces.Add (alias, retval);
}
retval.AddAssemblyReference (assembly);
}
public override void Error_NamespaceDoesNotExist(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 RootNamespace GetRootNamespace (string name)
{
return (RootNamespace) root_namespaces[name];
}
public override Type LookupTypeReflection (string name, Location loc, bool must_be_unique)
{
Type found_type = base.LookupTypeReflection (name, loc, must_be_unique);
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);
Error_AmbiguousPredefinedType (ds.Location, name, 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.fullname : "";
if (pname == "")
fullname = name;
else
fullname = parent.fullname + "." + 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 (ResolveContext ec)
{
return this;
}
public virtual void Error_NamespaceDoesNotExist (Location loc, string name)
{
if (name.IndexOf ('`') > 0) {
FullNamedExpression retval = Lookup (SimpleName.RemoveGenericArity (name), loc);
if (retval != null) {
Error_TypeArgumentsCannotBeUsed (retval, loc);
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, GetSignatureForError ());
}
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 (FullNamedExpression expr, Location loc)
{
if (expr is TypeExpr) {
Report.SymbolRelatedToPreviousError (expr.Type);
Error_TypeArgumentsCannotBeUsed (loc, "type", expr.GetSignatureForError ());
} else {
expr.Error_ExpressionCannotBeGeneric (loc);
}
}
public static void Error_TypeArgumentsCannotBeUsed (MethodBase mi, Location loc)
{
Report.SymbolRelatedToPreviousError (mi);
Error_TypeArgumentsCannotBeUsed (loc, "method", TypeManager.CSharpSignature (mi));
}
static void Error_TypeArgumentsCannotBeUsed (Location loc, string type, string name)
{
Report.Error(308, loc, "The non-generic {0} `{1}' cannot be used with the type arguments",
type, name);
}
public override string GetSignatureForError ()
{
return fullname;
}
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 bool HasDefinition (string name)
{
return declspaces != null && declspaces [name] != null;
}
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;
if (RootContext.EvalMode){
// Replace the TypeBuilder with a System.Type, as
// Reflection.Emit fails otherwise (we end up pretty
// much with Random type definitions later on).
Type tt = t.Assembly.GetType (t.Name);
if (tt != null)
t = tt;
}
}
}
string lookup = t != null ? t.FullName : (fullname.Length == 0 ? name : fullname + "." + name);
Type rt = root.LookupTypeReflection (lookup, loc, t == null);
// 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 (string name, Location loc)
{
if (namespaces.Contains (name))
return (Namespace) namespaces [name];
return LookupType (name, loc);
}
//
// Completes types with the given `prefix' and stores the results in `result'
//
public void CompletionGetTypesStartingWith (string prefix, Hashtable result)
{
int l = fullname.Length + 1;
ICollection res = root.CompletionGetTypesStartingWith (fullname + "." + prefix);
if (res == null)
return;
foreach (string match in res){
string x = match.Substring (l);
// Turn reflection nested classes foo+bar into foo.bar
x = x.Replace ('+', '.');
// Only get the first name element, no point in adding anything beyond the first dot.
int p = x.IndexOf ('.');
if (p != -1)
x = x.Substring (0, p);
// Turn Foo`N into Foo<
p = x.IndexOf ('`');
if (p != -1)
x = x.Substring (0, p) + "<";
if (!result.Contains (x))
result [x] = x;
}
}
public void RegisterExternalExtensionMethodClass (Type type)
{
// Ignore, extension methods cannot be nested
if (type.DeclaringType != null)
return;
if (type.IsNotPublic && !TypeManager.IsThisOrFriendAssembly (type.Assembly))
return;
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)
{
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.ModFlags & Modifiers.METHOD_EXTENSION) == 0)
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);
}
public void RemoveDeclSpace (string name)
{
declspaces.Remove (name);
}
///
/// 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; }
}
}
//
// Namespace container as created by the parser
//
public class NamespaceEntry : IResolveContext {
class UsingEntry {
readonly MemberName name;
Namespace resolved;
public UsingEntry (MemberName name)
{
this.name = name;
}
public string GetSignatureForError ()
{
return name.GetSignatureForError ();
}
public Location Location {
get { return name.Location; }
}
public MemberName MemberName {
get { return name; }
}
public string Name {
get { return GetSignatureForError (); }
}
public Namespace Resolve (IResolveContext rc)
{
if (resolved != null)
return resolved;
FullNamedExpression fne = name.GetTypeExpression ().ResolveAsTypeStep (rc, false);
if (fne == null)
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",
GetSignatureForError ());
}
return resolved;
}
public override string ToString ()
{
return Name;
}
}
class UsingAliasEntry {
public readonly string Alias;
public Location Location;
public UsingAliasEntry (string alias, Location loc)
{
this.Alias = alias;
this.Location = loc;
}
public virtual FullNamedExpression Resolve (IResolveContext rc)
{
FullNamedExpression fne = GlobalRootNamespace.Instance.GetRootNamespace (Alias);
if (fne == null) {
Report.Error (430, Location,
"The extern alias `{0}' was not specified in -reference option",
Alias);
}
return fne;
}
public override string ToString ()
{
return Alias;
}
}
class LocalUsingAliasEntry : UsingAliasEntry {
FullNamedExpression resolved;
MemberName value;
public LocalUsingAliasEntry (string alias, MemberName name, Location loc)
: base (alias, loc)
{
this.value = name;
}
public override FullNamedExpression Resolve (IResolveContext rc)
{
if (resolved != null || value == null)
return resolved;
resolved = value.GetTypeExpression ().ResolveAsTypeStep (rc, false);
if (resolved == null) {
value = null;
return null;
}
if (resolved is TypeExpr)
resolved = resolved.ResolveAsBaseTerminal (rc, false);
return resolved;
}
public override string ToString ()
{
return String.Format ("{0} = {1}", Alias, value.GetSignatureForError ());
}
}
Namespace ns;
NamespaceEntry parent, implicit_parent;
CompilationUnit file;
int symfile_id;
// Namespace using import block
ArrayList using_aliases;
ArrayList using_clauses;
public bool DeclarationFound = false;
// End
public readonly bool IsImplicit;
public readonly DeclSpace SlaveDeclSpace;
static readonly Namespace [] empty_namespaces = new Namespace [0];
Namespace [] namespace_using_table;
static ArrayList entries = new ArrayList ();
public static void Reset ()
{
entries = new ArrayList ();
}
public NamespaceEntry (NamespaceEntry parent, CompilationUnit file, string name)
{
this.parent = parent;
this.file = file;
entries.Add (this);
if (parent != null)
ns = parent.NS.GetNamespace (name, true);
else if (name != null)
ns = GlobalRootNamespace.Instance.GetNamespace (name, true);
else
ns = GlobalRootNamespace.Instance;
SlaveDeclSpace = new RootDeclSpace (this);
}
private NamespaceEntry (NamespaceEntry parent, CompilationUnit file, Namespace ns, bool slave)
{
this.parent = parent;
this.file = file;
this.IsImplicit = true;
this.ns = ns;
this.SlaveDeclSpace = slave ? new RootDeclSpace (this) : null;
}
//
// Populates the Namespace with some using declarations, used by the
// eval mode.
//
public void Populate (ArrayList source_using_aliases, ArrayList source_using_clauses)
{
foreach (UsingAliasEntry uae in source_using_aliases){
if (using_aliases == null)
using_aliases = new ArrayList ();
using_aliases.Add (uae);
}
foreach (UsingEntry ue in source_using_clauses){
if (using_clauses == null)
using_clauses = new ArrayList ();
using_clauses.Add (ue);
}
}
//
// Extracts the using alises and using clauses into a couple of
// arrays that might already have the same information; Used by the
// C# Eval mode.
//
public void Extract (ArrayList out_using_aliases, ArrayList out_using_clauses)
{
if (using_aliases != null){
foreach (UsingAliasEntry uae in using_aliases){
bool replaced = false;
for (int i = 0; i < out_using_aliases.Count; i++){
UsingAliasEntry out_uea = (UsingAliasEntry) out_using_aliases [i];
if (out_uea.Alias == uae.Alias){
out_using_aliases [i] = uae;
replaced = true;
break;
}
}
if (!replaced)
out_using_aliases.Add (uae);
}
}
if (using_clauses != null){
foreach (UsingEntry ue in using_clauses){
bool found = false;
foreach (UsingEntry out_ue in out_using_clauses)
if (out_ue.Name == ue.Name){
found = true;
break;
}
if (!found)
out_using_clauses.Add (ue);
}
}
}
//
// 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);
doppelganger.using_aliases = using_aliases;
}
return doppelganger;
}
}
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 AddUsing (MemberName name, Location loc)
{
if (DeclarationFound){
Report.Error (1529, loc, "A using clause must precede all other namespace elements except extern alias declarations");
}
if (using_clauses == null) {
using_clauses = new ArrayList ();
} else {
foreach (UsingEntry old_entry in using_clauses) {
if (name.Equals (old_entry.MemberName)) {
Report.SymbolRelatedToPreviousError (old_entry.Location, old_entry.GetSignatureForError ());
Report.Warning (105, 3, loc, "The using directive for `{0}' appeared previously in this namespace", name.GetSignatureForError ());
return;
}
}
}
using_clauses.Add (new UsingEntry (name));
}
public void AddUsingAlias (string alias, MemberName name, Location loc)
{
// TODO: This is parser bussines
if (DeclarationFound){
Report.Error (1529, loc, "A using clause must precede all other namespace elements except extern alias declarations");
}
if (RootContext.Version != LanguageVersion.ISO_1 && alias == "global")
Report.Warning (440, 2, loc, "An alias named `global' will not be used when resolving 'global::';" +
" the global namespace will be used instead");
AddUsingAlias (new LocalUsingAliasEntry (alias, name, loc));
}
public void AddUsingExternalAlias (string alias, Location loc)
{
// TODO: Do this in parser
bool not_first = using_clauses != null || DeclarationFound;
if (using_aliases != null && !not_first) {
foreach (UsingAliasEntry uae in using_aliases) {
if (uae is LocalUsingAliasEntry) {
not_first = true;
break;
}
}
}
if (not_first)
Report.Error (439, loc, "An extern alias declaration must precede all other elements");
if (alias == "global") {
Error_GlobalNamespaceRedefined (loc);
return;
}
AddUsingAlias (new UsingAliasEntry (alias, loc));
}
void AddUsingAlias (UsingAliasEntry uae)
{
if (using_aliases == null) {
using_aliases = new ArrayList ();
} else {
foreach (UsingAliasEntry entry in using_aliases) {
if (uae.Alias == entry.Alias) {
Report.SymbolRelatedToPreviousError (uae.Location, uae.Alias);
Report.Error (1537, entry.Location, "The using alias `{0}' appeared previously in this namespace",
entry.Alias);
return;
}
}
}
using_aliases.Add (uae);
}
///
/// 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, string name, Location loc)
{
ArrayList candidates = null;
foreach (Namespace n in GetUsingTable ()) {
ArrayList a = n.LookupExtensionMethod (extensionType, null, name);
if (a == null)
continue;
if (candidates == null)
candidates = a;
else
candidates.AddRange (a);
}
if (candidates != null)
return new ExtensionMethodGroupExpr (candidates, parent, extensionType, loc);
if (parent == null)
return null;
//
// Inspect parent namespaces in namespace expression
//
Namespace parent_ns = ns.Parent;
do {
candidates = parent_ns.LookupExtensionMethod (extensionType, null, name);
if (candidates != null)
return new ExtensionMethodGroupExpr (candidates, parent, extensionType, loc);
parent_ns = parent_ns.Parent;
} while (parent_ns != null);
//
// Continue in parent scope
//
return parent.LookupExtensionMethod (extensionType, name, loc);
}
public FullNamedExpression LookupNamespaceOrType (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 (name, loc, ignore_cs0104)) != null)
break;
}
return resolved;
}
public ICollection CompletionGetTypesStartingWith (string prefix)
{
Hashtable result = new Hashtable ();
for (NamespaceEntry curr_ns = this; curr_ns != null; curr_ns = curr_ns.ImplicitParent){
foreach (Namespace using_ns in GetUsingTable ()){
if (prefix.StartsWith (using_ns.Name)){
int ld = prefix.LastIndexOf ('.');
if (ld != -1){
string rest = prefix.Substring (ld+1);
using_ns.CompletionGetTypesStartingWith (rest, result);
}
}
using_ns.CompletionGetTypesStartingWith (prefix, result);
}
}
return result.Keys;
}
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.GetSignatureForError (), t2.GetSignatureForError ());
}
// Looks-up a alias named @name in this and surrounding namespace declarations
public FullNamedExpression LookupNamespaceAlias (string name)
{
for (NamespaceEntry n = this; n != null; n = n.ImplicitParent) {
if (n.using_aliases == null)
continue;
foreach (UsingAliasEntry ue in n.using_aliases) {
if (ue.Alias == name)
return ue.Resolve (Doppelganger);
}
}
return null;
}
private FullNamedExpression Lookup (string name, Location loc, bool ignore_cs0104)
{
//
// Check whether it's in the namespace.
//
FullNamedExpression fne = ns.Lookup (name, loc);
//
// Check aliases.
//
if (using_aliases != null) {
foreach (UsingAliasEntry ue in using_aliases) {
if (ue.Alias == name) {
if (fne != null) {
if (Doppelganger != null) {
// TODO: Namespace has broken location
//Report.SymbolRelatedToPreviousError (fne.Location, null);
Report.SymbolRelatedToPreviousError (ue.Location, null);
Report.Error (576, loc,
"Namespace `{0}' contains a definition with same name as alias `{1}'",
GetSignatureForError (), name);
} else {
return fne;
}
}
return ue.Resolve (Doppelganger);
}
}
}
if (fne != null)
return fne;
if (IsImplicit)
return null;
//
// Check using entries.
//
FullNamedExpression match = null;
foreach (Namespace using_ns in GetUsingTable ()) {
match = using_ns.Lookup (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;
}
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 (Doppelganger);
if (using_ns == null)
continue;
list.Add (using_ns);
}
namespace_using_table = (Namespace[])list.ToArray (typeof (Namespace));
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]).MemberName.GetName ();
}
symfile_id = SymbolWriter.DefineNamespace (ns.Name, file.CompileUnitEntry, 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 (using_aliases != null) {
foreach (UsingAliasEntry ue in using_aliases)
ue.Resolve (Doppelganger);
}
if (using_clauses != null) {
foreach (UsingEntry ue in using_clauses)
ue.Resolve (Doppelganger);
}
}
///
/// 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 ();
}
#region IResolveContext Members
public Type CurrentType {
get { return SlaveDeclSpace.CurrentType; }
}
public TypeContainer CurrentTypeDefinition {
get { return SlaveDeclSpace.CurrentTypeDefinition; }
}
public TypeParameter[] CurrentTypeParameters {
get { return SlaveDeclSpace.CurrentTypeParameters; }
}
public DeclSpace DeclContainer {
get { return SlaveDeclSpace; }
}
public bool IsInObsoleteScope {
get { return SlaveDeclSpace.IsInObsoleteScope; }
}
public bool IsInUnsafeScope {
get { return SlaveDeclSpace.IsInUnsafeScope; }
}
public bool IsStatic {
get { return SlaveDeclSpace.IsStatic; }
}
#endregion
}
}