make the -rewrite-test a bit more interesting: it now

wraps comments in <i> tags.  Extend rewrite tokens to support
this minimal functionality.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@57409 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 50 insertions, 3 deletions

diff --git a/lib/Rewrite/TokenRewriter.cpp b/lib/Rewrite/TokenRewriter.cpp
index 0362bacdfc..f288ac2402 100644
--- a/lib/Rewrite/TokenRewriter.cpp
+++ b/lib/Rewrite/TokenRewriter.cpp
@@ -14,11 +14,13 @@
 
 #include "clang/Rewrite/TokenRewriter.h"
 #include "clang/Lex/Lexer.h"
+#include "clang/Lex/ScratchBuffer.h"
 #include "clang/Basic/SourceManager.h"
 using namespace clang;
 
 TokenRewriter::TokenRewriter(unsigned FileID, SourceManager &SM,
                              const LangOptions &LangOpts) {
+  ScratchBuf.reset(new ScratchBuffer(SM));
   
   std::pair<const char*,const char*> File = SM.getBufferData(FileID);
   
@@ -33,21 +35,66 @@ TokenRewriter::TokenRewriter(unsigned FileID, SourceManager &SM,
   Token RawTok;
   RawLex.LexFromRawLexer(RawTok);
   while (RawTok.isNot(tok::eof)) {
+#if 0
+    if (Tok.is(tok::identifier)) {
+      // Look up the identifier info for the token.  This should use
+      // IdentifierTable directly instead of PP.
+      Tok.setIdentifierInfo(PP.LookUpIdentifierInfo(Tok));
+    }
+#endif
+      
     AddToken(RawTok, TokenList.end());
     RawLex.LexFromRawLexer(RawTok);
   }
+}
+
+TokenRewriter::~TokenRewriter() {
+}
+
+
+/// RemapIterator - Convert from token_iterator (a const iterator) to
+/// TokenRefTy (a non-const iterator).
+TokenRewriter::TokenRefTy TokenRewriter::RemapIterator(token_iterator I) {
+  if (I == token_end()) return TokenList.end();
   
-  
+  // FIXME: This is horrible, we should use our own list or something to avoid
+  // this.
+  std::map<SourceLocation, TokenRefTy>::iterator MapIt = 
+    TokenAtLoc.find(I->getLocation());
+  assert(MapIt != TokenAtLoc.end() && "iterator not in rewriter?");
+  return MapIt->second;
 }
 
+
 /// AddToken - Add the specified token into the Rewriter before the other
 /// position.
-void TokenRewriter::AddToken(const Token &T, TokenRefTy Where) {
+TokenRewriter::TokenRefTy 
+TokenRewriter::AddToken(const Token &T, TokenRefTy Where) {
   Where = TokenList.insert(Where, T);
   
   bool InsertSuccess = TokenAtLoc.insert(std::make_pair(T.getLocation(),
                                                         Where)).second;
   assert(InsertSuccess && "Token location already in rewriter!");
   InsertSuccess = InsertSuccess;
+  return Where;
 }
-    
+  
+
+TokenRewriter::token_iterator
+TokenRewriter::AddTokenBefore(token_iterator I, const char *Val){
+  unsigned Len = strlen(Val);
+  
+  // Plop the string into the scratch buffer, then create a token for this
+  // string.
+  Token Tok;
+  Tok.startToken();
+  Tok.setLocation(ScratchBuf->getToken(Val, Len));
+  Tok.setLength(Len);
+  
+  // TODO: Form a whole lexer around this and relex the token!  For now, just
+  // set kind to tok::unknown.
+  Tok.setKind(tok::unknown);
+
+  return AddToken(Tok, RemapIterator(I));
+}
+