external/bsd/llvm/dist/clang/lib/Rewrite/HTMLRewrite.cpp

   1 //== HTMLRewrite.cpp - Translate source code into prettified HTML --*- C++ -*-//
   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 //  This file defines the HTMLRewriter class, which is used to translate the
  11 //  text of a source file into prettified HTML.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "clang/Rewrite/Core/HTMLRewrite.h"
  16 #include "clang/Basic/SourceManager.h"
  17 #include "clang/Lex/Preprocessor.h"
  18 #include "clang/Lex/TokenConcatenation.h"
  19 #include "clang/Rewrite/Core/Rewriter.h"
  20 #include "llvm/ADT/SmallString.h"
  21 #include "llvm/Support/ErrorHandling.h"
  22 #include "llvm/Support/MemoryBuffer.h"
  23 #include "llvm/Support/raw_ostream.h"
  24 #include <memory>
  25 using namespace clang;
  26
  27
  28 /// HighlightRange - Highlight a range in the source code with the specified
  29 /// start/end tags.  B/E must be in the same file.  This ensures that
  30 /// start/end tags are placed at the start/end of each line if the range is
  31 /// multiline.
  32 void html::HighlightRange(Rewriter &R, SourceLocation B, SourceLocation E,
  33                           const char *StartTag, const char *EndTag) {
  34   SourceManager &SM = R.getSourceMgr();
  35   B = SM.getExpansionLoc(B);
  36   E = SM.getExpansionLoc(E);
  37   FileID FID = SM.getFileID(B);
  38   assert(SM.getFileID(E) == FID && "B/E not in the same file!");
  39
  40   unsigned BOffset = SM.getFileOffset(B);
  41   unsigned EOffset = SM.getFileOffset(E);
  42
  43   // Include the whole end token in the range.
  44   EOffset += Lexer::MeasureTokenLength(E, R.getSourceMgr(), R.getLangOpts());
  45
  46   bool Invalid = false;
  47   const char *BufferStart = SM.getBufferData(FID, &Invalid).data();
  48   if (Invalid)
  49     return;
  50
  51   HighlightRange(R.getEditBuffer(FID), BOffset, EOffset,
  52                  BufferStart, StartTag, EndTag);
  53 }
  54
  55 /// HighlightRange - This is the same as the above method, but takes
  56 /// decomposed file locations.
  57 void html::HighlightRange(RewriteBuffer &RB, unsigned B, unsigned E,
  58                           const char *BufferStart,
  59                           const char *StartTag, const char *EndTag) {
  60   // Insert the tag at the absolute start/end of the range.
  61   RB.InsertTextAfter(B, StartTag);
  62   RB.InsertTextBefore(E, EndTag);
  63
  64   // Scan the range to see if there is a \r or \n.  If so, and if the line is
  65   // not blank, insert tags on that line as well.
  66   bool HadOpenTag = true;
  67
  68   unsigned LastNonWhiteSpace = B;
  69   for (unsigned i = B; i != E; ++i) {
  70     switch (BufferStart[i]) {
  71     case '\r':
  72     case '\n':
  73       // Okay, we found a newline in the range.  If we have an open tag, we need
  74       // to insert a close tag at the first non-whitespace before the newline.
  75       if (HadOpenTag)
  76         RB.InsertTextBefore(LastNonWhiteSpace+1, EndTag);
  77
  78       // Instead of inserting an open tag immediately after the newline, we
  79       // wait until we see a non-whitespace character.  This prevents us from
  80       // inserting tags around blank lines, and also allows the open tag to
  81       // be put *after* whitespace on a non-blank line.
  82       HadOpenTag = false;
  83       break;
  84     case '\0':
  85     case ' ':
  86     case '\t':
  87     case '\f':
  88     case '\v':
  89       // Ignore whitespace.
  90       break;
  91
  92     default:
  93       // If there is no tag open, do it now.
  94       if (!HadOpenTag) {
  95         RB.InsertTextAfter(i, StartTag);
  96         HadOpenTag = true;
  97       }
  98
  99       // Remember this character.
 100       LastNonWhiteSpace = i;
 101       break;
 102     }
 103   }
 104 }
 105
 106 void html::EscapeText(Rewriter &R, FileID FID,
 107                       bool EscapeSpaces, bool ReplaceTabs) {
 108
 109   const llvm::MemoryBuffer *Buf = R.getSourceMgr().getBuffer(FID);
 110   const char* C = Buf->getBufferStart();
 111   const char* FileEnd = Buf->getBufferEnd();
 112
 113   assert (C <= FileEnd);
 114
 115   RewriteBuffer &RB = R.getEditBuffer(FID);
 116
 117   unsigned ColNo = 0;
 118   for (unsigned FilePos = 0; C != FileEnd ; ++C, ++FilePos) {
 119     switch (*C) {
 120     default: ++ColNo; break;
 121     case '\n':
 122     case '\r':
 123       ColNo = 0;
 124       break;
 125
 126     case ' ':
 127       if (EscapeSpaces)
 128         RB.ReplaceText(FilePos, 1, "&nbsp;");
 129       ++ColNo;
 130       break;
 131     case '\f':
 132       RB.ReplaceText(FilePos, 1, "<hr>");
 133       ColNo = 0;
 134       break;
 135
 136     case '\t': {
 137       if (!ReplaceTabs)
 138         break;
 139       unsigned NumSpaces = 8-(ColNo&7);
 140       if (EscapeSpaces)
 141         RB.ReplaceText(FilePos, 1,
 142                        StringRef("&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;"
 143                                        "&nbsp;&nbsp;&nbsp;", 6*NumSpaces));
 144       else
 145         RB.ReplaceText(FilePos, 1, StringRef("        ", NumSpaces));
 146       ColNo += NumSpaces;
 147       break;
 148     }
 149     case '<':
 150       RB.ReplaceText(FilePos, 1, "&lt;");
 151       ++ColNo;
 152       break;
 153
 154     case '>':
 155       RB.ReplaceText(FilePos, 1, "&gt;");
 156       ++ColNo;
 157       break;
 158
 159     case '&':
 160       RB.ReplaceText(FilePos, 1, "&amp;");
 161       ++ColNo;
 162       break;
 163     }
 164   }
 165 }
 166
 167 std::string html::EscapeText(StringRef s, bool EscapeSpaces, bool ReplaceTabs) {
 168
 169   unsigned len = s.size();
 170   std::string Str;
 171   llvm::raw_string_ostream os(Str);
 172
 173   for (unsigned i = 0 ; i < len; ++i) {
 174
 175     char c = s[i];
 176     switch (c) {
 177     default:
 178       os << c; break;
 179
 180     case ' ':
 181       if (EscapeSpaces) os << "&nbsp;";
 182       else os << ' ';
 183       break;
 184
 185     case '\t':
 186       if (ReplaceTabs) {
 187         if (EscapeSpaces)
 188           for (unsigned i = 0; i < 4; ++i)
 189             os << "&nbsp;";
 190         else
 191           for (unsigned i = 0; i < 4; ++i)
 192             os << " ";
 193       }
 194       else
 195         os << c;
 196
 197       break;
 198
 199     case '<': os << "&lt;"; break;
 200     case '>': os << "&gt;"; break;
 201     case '&': os << "&amp;"; break;
 202     }
 203   }
 204
 205   return os.str();
 206 }
 207
 208 static void AddLineNumber(RewriteBuffer &RB, unsigned LineNo,
 209                           unsigned B, unsigned E) {
 210   SmallString<256> Str;
 211   llvm::raw_svector_ostream OS(Str);
 212
 213   OS << "<tr><td class=\"num\" id=\"LN"
 214      << LineNo << "\">"
 215      << LineNo << "</td><td class=\"line\">";
 216
 217   if (B == E) { // Handle empty lines.
 218     OS << " </td></tr>";
 219     RB.InsertTextBefore(B, OS.str());
 220   } else {
 221     RB.InsertTextBefore(B, OS.str());
 222     RB.InsertTextBefore(E, "</td></tr>");
 223   }
 224 }
 225
 226 void html::AddLineNumbers(Rewriter& R, FileID FID) {
 227
 228   const llvm::MemoryBuffer *Buf = R.getSourceMgr().getBuffer(FID);
 229   const char* FileBeg = Buf->getBufferStart();
 230   const char* FileEnd = Buf->getBufferEnd();
 231   const char* C = FileBeg;
 232   RewriteBuffer &RB = R.getEditBuffer(FID);
 233
 234   assert (C <= FileEnd);
 235
 236   unsigned LineNo = 0;
 237   unsigned FilePos = 0;
 238
 239   while (C != FileEnd) {
 240
 241     ++LineNo;
 242     unsigned LineStartPos = FilePos;
 243     unsigned LineEndPos = FileEnd - FileBeg;
 244
 245     assert (FilePos <= LineEndPos);
 246     assert (C < FileEnd);
 247
 248     // Scan until the newline (or end-of-file).
 249
 250     while (C != FileEnd) {
 251       char c = *C;
 252       ++C;
 253
 254       if (c == '\n') {
 255         LineEndPos = FilePos++;
 256         break;
 257       }
 258
 259       ++FilePos;
 260     }
 261
 262     AddLineNumber(RB, LineNo, LineStartPos, LineEndPos);
 263   }
 264
 265   // Add one big table tag that surrounds all of the code.
 266   RB.InsertTextBefore(0, "<table class=\"code\">\n");
 267   RB.InsertTextAfter(FileEnd - FileBeg, "</table>");
 268 }
 269
 270 void html::AddHeaderFooterInternalBuiltinCSS(Rewriter& R, FileID FID,
 271                                              const char *title) {
 272
 273   const llvm::MemoryBuffer *Buf = R.getSourceMgr().getBuffer(FID);
 274   const char* FileStart = Buf->getBufferStart();
 275   const char* FileEnd = Buf->getBufferEnd();
 276
 277   SourceLocation StartLoc = R.getSourceMgr().getLocForStartOfFile(FID);
 278   SourceLocation EndLoc = StartLoc.getLocWithOffset(FileEnd-FileStart);
 279
 280   std::string s;
 281   llvm::raw_string_ostream os(s);
 282   os << "<!doctype html>\n" // Use HTML 5 doctype
 283         "<html>\n<head>\n";
 284
 285   if (title)
 286     os << "<title>" << html::EscapeText(title) << "</title>\n";
 287
 288   os << "<style type=\"text/css\">\n"
 289       " body { color:#000000; background-color:#ffffff }\n"
 290       " body { font-family:Helvetica, sans-serif; font-size:10pt }\n"
 291       " h1 { font-size:14pt }\n"
 292       " .code { border-collapse:collapse; width:100%; }\n"
 293       " .code { font-family: \"Monospace\", monospace; font-size:10pt }\n"
 294       " .code { line-height: 1.2em }\n"
 295       " .comment { color: green; font-style: oblique }\n"
 296       " .keyword { color: blue }\n"
 297       " .string_literal { color: red }\n"
 298       " .directive { color: darkmagenta }\n"
 299       // Macro expansions.
 300       " .expansion { display: none; }\n"
 301       " .macro:hover .expansion { display: block; border: 2px solid #FF0000; "
 302           "padding: 2px; background-color:#FFF0F0; font-weight: normal; "
 303           "  -webkit-border-radius:5px;  -webkit-box-shadow:1px 1px 7px #000; "
 304           "position: absolute; top: -1em; left:10em; z-index: 1 } \n"
 305       " .macro { color: darkmagenta; background-color:LemonChiffon;"
 306              // Macros are position: relative to provide base for expansions.
 307              " position: relative }\n"
 308       " .num { width:2.5em; padding-right:2ex; background-color:#eeeeee }\n"
 309       " .num { text-align:right; font-size:8pt }\n"
 310       " .num { color:#444444 }\n"
 311       " .line { padding-left: 1ex; border-left: 3px solid #ccc }\n"
 312       " .line { white-space: pre }\n"
 313       " .msg { -webkit-box-shadow:1px 1px 7px #000 }\n"
 314       " .msg { -webkit-border-radius:5px }\n"
 315       " .msg { font-family:Helvetica, sans-serif; font-size:8pt }\n"
 316       " .msg { float:left }\n"
 317       " .msg { padding:0.25em 1ex 0.25em 1ex }\n"
 318       " .msg { margin-top:10px; margin-bottom:10px }\n"
 319       " .msg { font-weight:bold }\n"
 320       " .msg { max-width:60em; word-wrap: break-word; white-space: pre-wrap }\n"
 321       " .msgT { padding:0x; spacing:0x }\n"
 322       " .msgEvent { background-color:#fff8b4; color:#000000 }\n"
 323       " .msgControl { background-color:#bbbbbb; color:#000000 }\n"
 324       " .mrange { background-color:#dfddf3 }\n"
 325       " .mrange { border-bottom:1px solid #6F9DBE }\n"
 326       " .PathIndex { font-weight: bold; padding:0px 5px; "
 327         "margin-right:5px; }\n"
 328       " .PathIndex { -webkit-border-radius:8px }\n"
 329       " .PathIndexEvent { background-color:#bfba87 }\n"
 330       " .PathIndexControl { background-color:#8c8c8c }\n"
 331       " .PathNav a { text-decoration:none; font-size: larger }\n"
 332       " .CodeInsertionHint { font-weight: bold; background-color: #10dd10 }\n"
 333       " .CodeRemovalHint { background-color:#de1010 }\n"
 334       " .CodeRemovalHint { border-bottom:1px solid #6F9DBE }\n"
 335       " table.simpletable {\n"
 336       "   padding: 5px;\n"
 337       "   font-size:12pt;\n"
 338       "   margin:20px;\n"
 339       "   border-collapse: collapse; border-spacing: 0px;\n"
 340       " }\n"
 341       " td.rowname {\n"
 342       "   text-align:right; font-weight:bold; color:#444444;\n"
 343       "   padding-right:2ex; }\n"
 344       "</style>\n</head>\n<body>";
 345
 346   // Generate header
 347   R.InsertTextBefore(StartLoc, os.str());
 348   // Generate footer
 349
 350   R.InsertTextAfter(EndLoc, "</body></html>\n");
 351 }
 352
 353 /// SyntaxHighlight - Relex the specified FileID and annotate the HTML with
 354 /// information about keywords, macro expansions etc.  This uses the macro
 355 /// table state from the end of the file, so it won't be perfectly perfect,
 356 /// but it will be reasonably close.
 357 void html::SyntaxHighlight(Rewriter &R, FileID FID, const Preprocessor &PP) {
 358   RewriteBuffer &RB = R.getEditBuffer(FID);
 359
 360   const SourceManager &SM = PP.getSourceManager();
 361   const llvm::MemoryBuffer *FromFile = SM.getBuffer(FID);
 362   Lexer L(FID, FromFile, SM, PP.getLangOpts());
 363   const char *BufferStart = L.getBuffer().data();
 364
 365   // Inform the preprocessor that we want to retain comments as tokens, so we
 366   // can highlight them.
 367   L.SetCommentRetentionState(true);
 368
 369   // Lex all the tokens in raw mode, to avoid entering #includes or expanding
 370   // macros.
 371   Token Tok;
 372   L.LexFromRawLexer(Tok);
 373
 374   while (Tok.isNot(tok::eof)) {
 375     // Since we are lexing unexpanded tokens, all tokens are from the main
 376     // FileID.
 377     unsigned TokOffs = SM.getFileOffset(Tok.getLocation());
 378     unsigned TokLen = Tok.getLength();
 379     switch (Tok.getKind()) {
 380     default: break;
 381     case tok::identifier:
 382       llvm_unreachable("tok::identifier in raw lexing mode!");
 383     case tok::raw_identifier: {
 384       // Fill in Result.IdentifierInfo and update the token kind,
 385       // looking up the identifier in the identifier table.
 386       PP.LookUpIdentifierInfo(Tok);
 387
 388       // If this is a pp-identifier, for a keyword, highlight it as such.
 389       if (Tok.isNot(tok::identifier))
 390         HighlightRange(RB, TokOffs, TokOffs+TokLen, BufferStart,
 391                        "<span class='keyword'>", "</span>");
 392       break;
 393     }
 394     case tok::comment:
 395       HighlightRange(RB, TokOffs, TokOffs+TokLen, BufferStart,
 396                      "<span class='comment'>", "</span>");
 397       break;
 398     case tok::utf8_string_literal:
 399       // Chop off the u part of u8 prefix
 400       ++TokOffs;
 401       --TokLen;
 402       // FALL THROUGH to chop the 8
 403     case tok::wide_string_literal:
 404     case tok::utf16_string_literal:
 405     case tok::utf32_string_literal:
 406       // Chop off the L, u, U or 8 prefix
 407       ++TokOffs;
 408       --TokLen;
 409       // FALL THROUGH.
 410     case tok::string_literal:
 411       // FIXME: Exclude the optional ud-suffix from the highlighted range.
 412       HighlightRange(RB, TokOffs, TokOffs+TokLen, BufferStart,
 413                      "<span class='string_literal'>", "</span>");
 414       break;
 415     case tok::hash: {
 416       // If this is a preprocessor directive, all tokens to end of line are too.
 417       if (!Tok.isAtStartOfLine())
 418         break;
 419
 420       // Eat all of the tokens until we get to the next one at the start of
 421       // line.
 422       unsigned TokEnd = TokOffs+TokLen;
 423       L.LexFromRawLexer(Tok);
 424       while (!Tok.isAtStartOfLine() && Tok.isNot(tok::eof)) {
 425         TokEnd = SM.getFileOffset(Tok.getLocation())+Tok.getLength();
 426         L.LexFromRawLexer(Tok);
 427       }
 428
 429       // Find end of line.  This is a hack.
 430       HighlightRange(RB, TokOffs, TokEnd, BufferStart,
 431                      "<span class='directive'>", "</span>");
 432
 433       // Don't skip the next token.
 434       continue;
 435     }
 436     }
 437
 438     L.LexFromRawLexer(Tok);
 439   }
 440 }
 441
 442 /// HighlightMacros - This uses the macro table state from the end of the
 443 /// file, to re-expand macros and insert (into the HTML) information about the
 444 /// macro expansions.  This won't be perfectly perfect, but it will be
 445 /// reasonably close.
 446 void html::HighlightMacros(Rewriter &R, FileID FID, const Preprocessor& PP) {
 447   // Re-lex the raw token stream into a token buffer.
 448   const SourceManager &SM = PP.getSourceManager();
 449   std::vector<Token> TokenStream;
 450
 451   const llvm::MemoryBuffer *FromFile = SM.getBuffer(FID);
 452   Lexer L(FID, FromFile, SM, PP.getLangOpts());
 453
 454   // Lex all the tokens in raw mode, to avoid entering #includes or expanding
 455   // macros.
 456   while (1) {
 457     Token Tok;
 458     L.LexFromRawLexer(Tok);
 459
 460     // If this is a # at the start of a line, discard it from the token stream.
 461     // We don't want the re-preprocess step to see #defines, #includes or other
 462     // preprocessor directives.
 463     if (Tok.is(tok::hash) && Tok.isAtStartOfLine())
 464       continue;
 465
 466     // If this is a ## token, change its kind to unknown so that repreprocessing
 467     // it will not produce an error.
 468     if (Tok.is(tok::hashhash))
 469       Tok.setKind(tok::unknown);
 470
 471     // If this raw token is an identifier, the raw lexer won't have looked up
 472     // the corresponding identifier info for it.  Do this now so that it will be
 473     // macro expanded when we re-preprocess it.
 474     if (Tok.is(tok::raw_identifier))
 475       PP.LookUpIdentifierInfo(Tok);
 476
 477     TokenStream.push_back(Tok);
 478
 479     if (Tok.is(tok::eof)) break;
 480   }
 481
 482   // Temporarily change the diagnostics object so that we ignore any generated
 483   // diagnostics from this pass.
 484   DiagnosticsEngine TmpDiags(PP.getDiagnostics().getDiagnosticIDs(),
 485                              &PP.getDiagnostics().getDiagnosticOptions(),
 486                       new IgnoringDiagConsumer);
 487
 488   // FIXME: This is a huge hack; we reuse the input preprocessor because we want
 489   // its state, but we aren't actually changing it (we hope). This should really
 490   // construct a copy of the preprocessor.
 491   Preprocessor &TmpPP = const_cast<Preprocessor&>(PP);
 492   DiagnosticsEngine *OldDiags = &TmpPP.getDiagnostics();
 493   TmpPP.setDiagnostics(TmpDiags);
 494
 495   // Inform the preprocessor that we don't want comments.
 496   TmpPP.SetCommentRetentionState(false, false);
 497
 498   // We don't want pragmas either. Although we filtered out #pragma, removing
 499   // _Pragma and __pragma is much harder.
 500   bool PragmasPreviouslyEnabled = TmpPP.getPragmasEnabled();
 501   TmpPP.setPragmasEnabled(false);
 502
 503   // Enter the tokens we just lexed.  This will cause them to be macro expanded
 504   // but won't enter sub-files (because we removed #'s).
 505   TmpPP.EnterTokenStream(&TokenStream[0], TokenStream.size(), false, false);
 506
 507   TokenConcatenation ConcatInfo(TmpPP);
 508
 509   // Lex all the tokens.
 510   Token Tok;
 511   TmpPP.Lex(Tok);
 512   while (Tok.isNot(tok::eof)) {
 513     // Ignore non-macro tokens.
 514     if (!Tok.getLocation().isMacroID()) {
 515       TmpPP.Lex(Tok);
 516       continue;
 517     }
 518
 519     // Okay, we have the first token of a macro expansion: highlight the
 520     // expansion by inserting a start tag before the macro expansion and
 521     // end tag after it.
 522     std::pair<SourceLocation, SourceLocation> LLoc =
 523       SM.getExpansionRange(Tok.getLocation());
 524
 525     // Ignore tokens whose instantiation location was not the main file.
 526     if (SM.getFileID(LLoc.first) != FID) {
 527       TmpPP.Lex(Tok);
 528       continue;
 529     }
 530
 531     assert(SM.getFileID(LLoc.second) == FID &&
 532            "Start and end of expansion must be in the same ultimate file!");
 533
 534     std::string Expansion = EscapeText(TmpPP.getSpelling(Tok));
 535     unsigned LineLen = Expansion.size();
 536
 537     Token PrevPrevTok;
 538     Token PrevTok = Tok;
 539     // Okay, eat this token, getting the next one.
 540     TmpPP.Lex(Tok);
 541
 542     // Skip all the rest of the tokens that are part of this macro
 543     // instantiation.  It would be really nice to pop up a window with all the
 544     // spelling of the tokens or something.
 545     while (!Tok.is(tok::eof) &&
 546            SM.getExpansionLoc(Tok.getLocation()) == LLoc.first) {
 547       // Insert a newline if the macro expansion is getting large.
 548       if (LineLen > 60) {
 549         Expansion += "<br>";
 550         LineLen = 0;
 551       }
 552
 553       LineLen -= Expansion.size();
 554
 555       // If the tokens were already space separated, or if they must be to avoid
 556       // them being implicitly pasted, add a space between them.
 557       if (Tok.hasLeadingSpace() ||
 558           ConcatInfo.AvoidConcat(PrevPrevTok, PrevTok, Tok))
 559         Expansion += ' ';
 560
 561       // Escape any special characters in the token text.
 562       Expansion += EscapeText(TmpPP.getSpelling(Tok));
 563       LineLen += Expansion.size();
 564
 565       PrevPrevTok = PrevTok;
 566       PrevTok = Tok;
 567       TmpPP.Lex(Tok);
 568     }
 569
 570
 571     // Insert the expansion as the end tag, so that multi-line macros all get
 572     // highlighted.
 573     Expansion = "<span class='expansion'>" + Expansion + "</span></span>";
 574
 575     HighlightRange(R, LLoc.first, LLoc.second,
 576                    "<span class='macro'>", Expansion.c_str());
 577   }
 578
 579   // Restore the preprocessor's old state.
 580   TmpPP.setDiagnostics(*OldDiags);
 581   TmpPP.setPragmasEnabled(PragmasPreviouslyEnabled);
 582 }