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      1 //===--- HTMLPrint.cpp - Source code -> HTML pretty-printing --------------===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is distributed under the University of Illinois Open Source
      6 // License. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 //
     10 // Pretty-printing of source code to HTML.
     11 //
     12 //===----------------------------------------------------------------------===//
     13 
     14 #include "clang/Rewrite/Frontend/ASTConsumers.h"
     15 #include "clang/AST/ASTConsumer.h"
     16 #include "clang/AST/ASTContext.h"
     17 #include "clang/AST/Decl.h"
     18 #include "clang/Basic/Diagnostic.h"
     19 #include "clang/Basic/FileManager.h"
     20 #include "clang/Basic/SourceManager.h"
     21 #include "clang/Lex/Preprocessor.h"
     22 #include "clang/Rewrite/Core/HTMLRewrite.h"
     23 #include "clang/Rewrite/Core/Rewriter.h"
     24 #include "llvm/Support/MemoryBuffer.h"
     25 #include "llvm/Support/raw_ostream.h"
     26 using namespace clang;
     27 
     28 //===----------------------------------------------------------------------===//
     29 // Functional HTML pretty-printing.
     30 //===----------------------------------------------------------------------===//
     31 
     32 namespace {
     33   class HTMLPrinter : public ASTConsumer {
     34     Rewriter R;
     35     raw_ostream *Out;
     36     Preprocessor &PP;
     37     bool SyntaxHighlight, HighlightMacros;
     38 
     39   public:
     40     HTMLPrinter(raw_ostream *OS, Preprocessor &pp,
     41                 bool _SyntaxHighlight, bool _HighlightMacros)
     42       : Out(OS), PP(pp), SyntaxHighlight(_SyntaxHighlight),
     43         HighlightMacros(_HighlightMacros) {}
     44 
     45     void Initialize(ASTContext &context) override;
     46     void HandleTranslationUnit(ASTContext &Ctx) override;
     47   };
     48 }
     49 
     50 std::unique_ptr<ASTConsumer> clang::CreateHTMLPrinter(raw_ostream *OS,
     51                                                       Preprocessor &PP,
     52                                                       bool SyntaxHighlight,
     53                                                       bool HighlightMacros) {
     54   return llvm::make_unique<HTMLPrinter>(OS, PP, SyntaxHighlight,
     55                                         HighlightMacros);
     56 }
     57 
     58 void HTMLPrinter::Initialize(ASTContext &context) {
     59   R.setSourceMgr(context.getSourceManager(), context.getLangOpts());
     60 }
     61 
     62 void HTMLPrinter::HandleTranslationUnit(ASTContext &Ctx) {
     63   if (PP.getDiagnostics().hasErrorOccurred())
     64     return;
     65 
     66   // Format the file.
     67   FileID FID = R.getSourceMgr().getMainFileID();
     68   const FileEntry* Entry = R.getSourceMgr().getFileEntryForID(FID);
     69   const char* Name;
     70   // In some cases, in particular the case where the input is from stdin,
     71   // there is no entry.  Fall back to the memory buffer for a name in those
     72   // cases.
     73   if (Entry)
     74     Name = Entry->getName();
     75   else
     76     Name = R.getSourceMgr().getBuffer(FID)->getBufferIdentifier();
     77 
     78   html::AddLineNumbers(R, FID);
     79   html::AddHeaderFooterInternalBuiltinCSS(R, FID, Name);
     80 
     81   // If we have a preprocessor, relex the file and syntax highlight.
     82   // We might not have a preprocessor if we come from a deserialized AST file,
     83   // for example.
     84 
     85   if (SyntaxHighlight) html::SyntaxHighlight(R, FID, PP);
     86   if (HighlightMacros) html::HighlightMacros(R, FID, PP);
     87   html::EscapeText(R, FID, false, true);
     88 
     89   // Emit the HTML.
     90   const RewriteBuffer &RewriteBuf = R.getEditBuffer(FID);
     91   char *Buffer = (char*)malloc(RewriteBuf.size());
     92   std::copy(RewriteBuf.begin(), RewriteBuf.end(), Buffer);
     93   Out->write(Buffer, RewriteBuf.size());
     94   free(Buffer);
     95 }
     96