Initial implementation of a code-completion interface in Clang. In

essence, code completion is triggered by a magic "code completion"
token produced by the lexer [*], which the parser recognizes at
certain points in the grammar. The parser then calls into the Action
object with the appropriate CodeCompletionXXX action.

Sema implements the CodeCompletionXXX callbacks by performing minimal
translation, then forwarding them to a CodeCompletionConsumer
subclass, which uses the results of semantic analysis to provide
code-completion results. At present, only a single, "printing" code
completion consumer is available, for regression testing and
debugging. However, the design is meant to permit other
code-completion consumers.

This initial commit contains two code-completion actions: one for
member access, e.g., "x." or "p->", and one for
nested-name-specifiers, e.g., "std::". More code-completion actions
will follow, along with improved gathering of code-completion results
for the various contexts.

[*] In the current -code-completion-dump testing/debugging mode, the
file is truncated at the completion point and EOF is translated into
"code completion".


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@82166 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 14 insertions, 1 deletions

diff --git a/lib/Lex/Lexer.cpp b/lib/Lex/Lexer.cpp
index 23ba6e1ca7..351b63f6bb 100644
--- a/lib/Lex/Lexer.cpp
+++ b/lib/Lex/Lexer.cpp
@@ -70,7 +70,8 @@ void Lexer::InitLexer(const char *BufStart, const char *BufPtr,
          " to simplify lexing!");
 
   Is_PragmaLexer = false;
-
+  IsEofCodeCompletion = false;
+  
   // Start of the file is a start of line.
   IsAtStartOfLine = true;
 
@@ -1309,6 +1310,18 @@ bool Lexer::LexEndOfFile(Token &Result, const char *CurPtr) {
     return true;  // Have a token.
   }
 
+  if (IsEofCodeCompletion) {
+    // We're at the end of the file, but we've been asked to conside the
+    // end of the file to be a code-completion token. Return the
+    // code-completion token.
+    Result.startToken();
+    FormTokenWithChars(Result, CurPtr, tok::code_completion);
+
+    // Only do the eof -> code_completion translation once.
+    IsEofCodeCompletion = false;
+    return true;
+  }
+  
   // If we are in raw mode, return this event as an EOF token.  Let the caller
   // that put us in raw mode handle the event.
   if (isLexingRawMode()) {