Chris Lattner | 77cd2a0 | 2007-10-11 00:43:27 +0000 | [diff] [blame] | 1 | //===--- RewriteTest.cpp - Playground for the code rewriter ---------------===// |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
| 5 | // This file was developed by Chris Lattner and is distributed under the |
| 6 | // University of Illinois Open Source License. See LICENSE.TXT for details. |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | // |
| 10 | // Hacks and fun related to the code rewriter. |
| 11 | // |
| 12 | //===----------------------------------------------------------------------===// |
| 13 | |
| 14 | #include "ASTConsumers.h" |
Chris Lattner | 8a12c27 | 2007-10-11 18:38:32 +0000 | [diff] [blame^] | 15 | #include "clang/Rewrite/Rewriter.h" |
Chris Lattner | 77cd2a0 | 2007-10-11 00:43:27 +0000 | [diff] [blame] | 16 | #include "clang/AST/AST.h" |
| 17 | #include "clang/AST/ASTConsumer.h" |
Chris Lattner | 8a12c27 | 2007-10-11 18:38:32 +0000 | [diff] [blame^] | 18 | #include "clang/Basic/SourceManager.h" |
Chris Lattner | 77cd2a0 | 2007-10-11 00:43:27 +0000 | [diff] [blame] | 19 | using namespace clang; |
| 20 | |
| 21 | |
| 22 | namespace { |
Chris Lattner | 8a12c27 | 2007-10-11 18:38:32 +0000 | [diff] [blame^] | 23 | class RewriteTest : public ASTConsumer { |
Chris Lattner | 77cd2a0 | 2007-10-11 00:43:27 +0000 | [diff] [blame] | 24 | SourceManager *SM; |
Chris Lattner | 8a12c27 | 2007-10-11 18:38:32 +0000 | [diff] [blame^] | 25 | unsigned MainFileID; |
Chris Lattner | 77cd2a0 | 2007-10-11 00:43:27 +0000 | [diff] [blame] | 26 | public: |
Chris Lattner | 8a12c27 | 2007-10-11 18:38:32 +0000 | [diff] [blame^] | 27 | void Initialize(ASTContext &Context, unsigned mainFileID) { |
Chris Lattner | 77cd2a0 | 2007-10-11 00:43:27 +0000 | [diff] [blame] | 28 | SM = &Context.SourceMgr; |
Chris Lattner | 8a12c27 | 2007-10-11 18:38:32 +0000 | [diff] [blame^] | 29 | MainFileID = mainFileID; |
Chris Lattner | 77cd2a0 | 2007-10-11 00:43:27 +0000 | [diff] [blame] | 30 | } |
| 31 | |
| 32 | virtual void HandleTopLevelDecl(Decl *D); |
Chris Lattner | 8a12c27 | 2007-10-11 18:38:32 +0000 | [diff] [blame^] | 33 | |
| 34 | |
| 35 | ~RewriteTest(); |
Chris Lattner | 77cd2a0 | 2007-10-11 00:43:27 +0000 | [diff] [blame] | 36 | }; |
| 37 | } |
| 38 | |
Chris Lattner | 8a12c27 | 2007-10-11 18:38:32 +0000 | [diff] [blame^] | 39 | ASTConsumer *clang::CreateCodeRewriterTest() { return new RewriteTest(); } |
Chris Lattner | 77cd2a0 | 2007-10-11 00:43:27 +0000 | [diff] [blame] | 40 | |
Chris Lattner | 8a12c27 | 2007-10-11 18:38:32 +0000 | [diff] [blame^] | 41 | void RewriteTest::HandleTopLevelDecl(Decl *D) { |
| 42 | // Nothing to do here yet. |
| 43 | #if 0 |
Chris Lattner | 77cd2a0 | 2007-10-11 00:43:27 +0000 | [diff] [blame] | 44 | if (NamedDecl *ND = dyn_cast<NamedDecl>(D)) |
| 45 | if (ND->getName()) |
| 46 | printf("%s\n", ND->getName()); |
Chris Lattner | 8a12c27 | 2007-10-11 18:38:32 +0000 | [diff] [blame^] | 47 | #endif |
| 48 | } |
| 49 | |
| 50 | |
| 51 | |
| 52 | RewriteTest::~RewriteTest() { |
| 53 | Rewriter Rewrite(*SM); |
Chris Lattner | 77cd2a0 | 2007-10-11 00:43:27 +0000 | [diff] [blame] | 54 | |
Chris Lattner | 8a12c27 | 2007-10-11 18:38:32 +0000 | [diff] [blame^] | 55 | // Get the top-level buffer that this corresponds to. |
| 56 | std::pair<const char*, const char*> MainBuf = SM->getBufferData(MainFileID); |
| 57 | const char *MainBufStart = MainBuf.first; |
| 58 | const char *MainBufEnd = MainBuf.second; |
| 59 | |
| 60 | // Loop over the whole file, looking for tabs. |
| 61 | for (const char *BufPtr = MainBufStart; BufPtr != MainBufEnd; ++BufPtr) { |
| 62 | if (*BufPtr != '\t') |
| 63 | continue; |
| 64 | |
| 65 | // Okay, we found a tab. This tab will turn into at least one character, |
| 66 | // but it depends on which 'virtual column' it is in. Compute that now. |
| 67 | unsigned VCol = 0; |
| 68 | while (BufPtr-VCol != MainBufStart && BufPtr[-VCol-1] != '\t' && |
| 69 | BufPtr[-VCol-1] != '\n' && BufPtr[-VCol-1] != '\r') |
| 70 | ++VCol; |
| 71 | |
| 72 | // Okay, now that we know the virtual column, we know how many spaces to |
| 73 | // insert. We assume 8-character tab-stops. |
| 74 | unsigned Spaces = 8-(VCol & 7); |
| 75 | |
| 76 | // Get the location of the tab. |
| 77 | SourceLocation TabLoc = |
| 78 | SourceLocation::getFileLoc(MainFileID, BufPtr-MainBufStart); |
| 79 | |
| 80 | // Rewrite the single tab character into a sequence of spaces. |
| 81 | Rewrite.ReplaceText(TabLoc, 1, "xxxxxxxxxxx", Spaces); |
| 82 | } |
| 83 | |
| 84 | // Get the buffer corresponding to MainFileID. If we haven't changed it, then |
| 85 | // we are done. |
| 86 | if (const RewriteBuffer *RewriteBuf = |
| 87 | Rewrite.getRewriteBufferFor(MainFileID)) { |
| 88 | RewriteBuf = 0; |
| 89 | printf("Changed\n"); |
| 90 | } else { |
| 91 | printf("No changes\n"); |
| 92 | } |
Chris Lattner | 77cd2a0 | 2007-10-11 00:43:27 +0000 | [diff] [blame] | 93 | } |