Introduce a new libclang aPI function,

clang_codeCompleteGetContexts(), that provides the client with
information about the context in which code completion has occurred
and what kinds of entities make sense as completions at that
point. Patch by Connor Wakamo!

llvm-svn: 134615

1 files changed, 30 insertions, 16 deletions

diff --git a/clang/lib/Frontend/ASTUnit.cpp b/clang/lib/Frontend/ASTUnit.cpp
index 4407d2d3e22..ad476455ebc 100644
--- a/clang/lib/Frontend/ASTUnit.cpp
+++ b/clang/lib/Frontend/ASTUnit.cpp
@@ -182,6 +182,10 @@ static unsigned getDeclShowContexts(NamedDecl *ND,
     // all types are available due to functional casts.
     if (LangOpts.CPlusPlus || isa<ObjCInterfaceDecl>(ND))
       Contexts |= (1 << (CodeCompletionContext::CCC_ObjCMessageReceiver - 1));
+    
+    // In Objective-C, you can only be a subclass of another Objective-C class
+    if (isa<ObjCInterfaceDecl>(ND))
+      Contexts |= (1 << (CodeCompletionContext::CCC_ObjCSuperclass - 1));
 
     // Deal with tag names.
     if (isa<EnumDecl>(ND)) {
@@ -208,6 +212,8 @@ static unsigned getDeclShowContexts(NamedDecl *ND,
              | (1 << (CodeCompletionContext::CCC_ObjCMessageReceiver - 1));
   } else if (isa<ObjCProtocolDecl>(ND)) {
     Contexts = (1 << (CodeCompletionContext::CCC_ObjCProtocolName - 1));
+  } else if (isa<ObjCCategoryDecl>(ND)) {
+    Contexts = (1 << (CodeCompletionContext::CCC_ObjCCategoryName - 1));
   } else if (isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND)) {
     Contexts = (1 << (CodeCompletionContext::CCC_Namespace - 1));
    
@@ -1902,7 +1908,7 @@ namespace {
   /// results from an ASTUnit with the code-completion results provided to it,
   /// then passes the result on to 
   class AugmentedCodeCompleteConsumer : public CodeCompleteConsumer {
-    unsigned NormalContexts;
+    unsigned long long NormalContexts;
     ASTUnit &AST;
     CodeCompleteConsumer &Next;
     
@@ -1916,22 +1922,24 @@ namespace {
       // Compute the set of contexts in which we will look when we don't have
       // any information about the specific context.
       NormalContexts 
-        = (1 << (CodeCompletionContext::CCC_TopLevel - 1))
-        | (1 << (CodeCompletionContext::CCC_ObjCInterface - 1))
-        | (1 << (CodeCompletionContext::CCC_ObjCImplementation - 1))
-        | (1 << (CodeCompletionContext::CCC_ObjCIvarList - 1))
-        | (1 << (CodeCompletionContext::CCC_Statement - 1))
-        | (1 << (CodeCompletionContext::CCC_Expression - 1))
-        | (1 << (CodeCompletionContext::CCC_ObjCMessageReceiver - 1))
-        | (1 << (CodeCompletionContext::CCC_MemberAccess - 1))
-        | (1 << (CodeCompletionContext::CCC_ObjCProtocolName - 1))
-        | (1 << (CodeCompletionContext::CCC_ParenthesizedExpression - 1))
-        | (1 << (CodeCompletionContext::CCC_Recovery - 1));
+        = (1LL << (CodeCompletionContext::CCC_TopLevel - 1))
+        | (1LL << (CodeCompletionContext::CCC_ObjCInterface - 1))
+        | (1LL << (CodeCompletionContext::CCC_ObjCImplementation - 1))
+        | (1LL << (CodeCompletionContext::CCC_ObjCIvarList - 1))
+        | (1LL << (CodeCompletionContext::CCC_Statement - 1))
+        | (1LL << (CodeCompletionContext::CCC_Expression - 1))
+        | (1LL << (CodeCompletionContext::CCC_ObjCMessageReceiver - 1))
+        | (1LL << (CodeCompletionContext::CCC_DotMemberAccess - 1))
+        | (1LL << (CodeCompletionContext::CCC_ArrowMemberAccess - 1))
+        | (1LL << (CodeCompletionContext::CCC_ObjCPropertyAccess - 1))
+        | (1LL << (CodeCompletionContext::CCC_ObjCProtocolName - 1))
+        | (1LL << (CodeCompletionContext::CCC_ParenthesizedExpression - 1))
+        | (1LL << (CodeCompletionContext::CCC_Recovery - 1));
 
       if (AST.getASTContext().getLangOptions().CPlusPlus)
-        NormalContexts |= (1 << (CodeCompletionContext::CCC_EnumTag - 1))
-                    | (1 << (CodeCompletionContext::CCC_UnionTag - 1))
-                    | (1 << (CodeCompletionContext::CCC_ClassOrStructTag - 1));
+        NormalContexts |= (1LL << (CodeCompletionContext::CCC_EnumTag - 1))
+                   | (1LL << (CodeCompletionContext::CCC_UnionTag - 1))
+                   | (1LL << (CodeCompletionContext::CCC_ClassOrStructTag - 1));
     }
     
     virtual void ProcessCodeCompleteResults(Sema &S, 
@@ -1969,12 +1977,15 @@ static void CalculateHiddenNames(const CodeCompletionContext &Context,
   case CodeCompletionContext::CCC_Statement:
   case CodeCompletionContext::CCC_Expression:
   case CodeCompletionContext::CCC_ObjCMessageReceiver:
-  case CodeCompletionContext::CCC_MemberAccess:
+  case CodeCompletionContext::CCC_DotMemberAccess:
+  case CodeCompletionContext::CCC_ArrowMemberAccess:
+  case CodeCompletionContext::CCC_ObjCPropertyAccess:
   case CodeCompletionContext::CCC_Namespace:
   case CodeCompletionContext::CCC_Type:
   case CodeCompletionContext::CCC_Name:
   case CodeCompletionContext::CCC_PotentiallyQualifiedName:
   case CodeCompletionContext::CCC_ParenthesizedExpression:
+  case CodeCompletionContext::CCC_ObjCSuperclass:
     break;
     
   case CodeCompletionContext::CCC_EnumTag:
@@ -1993,6 +2004,9 @@ static void CalculateHiddenNames(const CodeCompletionContext &Context,
   case CodeCompletionContext::CCC_TypeQualifiers:
   case CodeCompletionContext::CCC_Other:
   case CodeCompletionContext::CCC_OtherWithMacros:
+  case CodeCompletionContext::CCC_ObjCInstanceMessage:
+  case CodeCompletionContext::CCC_ObjCClassMessage:
+  case CodeCompletionContext::CCC_ObjCCategoryName:
     // We're looking for nothing, or we're looking for names that cannot
     // be hidden.
     return;