//== HTMLRewrite.cpp - Translate source code into prettified HTML --*- C++ -*-//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the HTMLRewriter class, which is used to translate the
// text of a source file into prettified HTML.
//
//===----------------------------------------------------------------------===//
#include "clang/Rewrite/Core/HTMLRewrite.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Lex/TokenConcatenation.h"
#include "clang/Rewrite/Core/Rewriter.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/raw_ostream.h"
#include <memory>
using namespace clang;
/// HighlightRange - Highlight a range in the source code with the specified
/// start/end tags. B/E must be in the same file. This ensures that
/// start/end tags are placed at the start/end of each line if the range is
/// multiline.
void html::HighlightRange(Rewriter &R, SourceLocation B, SourceLocation E,
const char *StartTag, const char *EndTag) {
SourceManager &SM = R.getSourceMgr();
B = SM.getExpansionLoc(B);
E = SM.getExpansionLoc(E);
FileID FID = SM.getFileID(B);
assert(SM.getFileID(E) == FID && "B/E not in the same file!");
unsigned BOffset = SM.getFileOffset(B);
unsigned EOffset = SM.getFileOffset(E);
// Include the whole end token in the range.
EOffset += Lexer::MeasureTokenLength(E, R.getSourceMgr(), R.getLangOpts());
bool Invalid = false;
const char *BufferStart = SM.getBufferData(FID, &Invalid).data();
if (Invalid)
return;
HighlightRange(R.getEditBuffer(FID), BOffset, EOffset,
BufferStart, StartTag, EndTag);
}
/// HighlightRange - This is the same as the above method, but takes
/// decomposed file locations.
void html::HighlightRange(RewriteBuffer &RB, unsigned B, unsigned E,
const char *BufferStart,
const char *StartTag, const char *EndTag) {
// Insert the tag at the absolute start/end of the range.
RB.InsertTextAfter(B, StartTag);
RB.InsertTextBefore(E, EndTag);
// Scan the range to see if there is a \r or \n. If so, and if the line is
// not blank, insert tags on that line as well.
bool HadOpenTag = true;
unsigned LastNonWhiteSpace = B;
for (unsigned i = B; i != E; ++i) {
switch (BufferStart[i]) {
case '\r':
case '\n':
// Okay, we found a newline in the range. If we have an open tag, we need
// to insert a close tag at the first non-whitespace before the newline.
if (HadOpenTag)
RB.InsertTextBefore(LastNonWhiteSpace+1, EndTag);
// Instead of inserting an open tag immediately after the newline, we
// wait until we see a non-whitespace character. This prevents us from
// inserting tags around blank lines, and also allows the open tag to
// be put *after* whitespace on a non-blank line.
HadOpenTag = false;
break;
case '\0':
case ' ':
case '\t':
case '\f':
case '\v':
// Ignore whitespace.
break;
default:
// If there is no tag open, do it now.
if (!HadOpenTag) {
RB.InsertTextAfter(i, StartTag);
HadOpenTag = true;
}
// Remember this character.
LastNonWhiteSpace = i;
break;
}
}
}
void html::EscapeText(Rewriter &R, FileID FID,
bool EscapeSpaces, bool ReplaceTabs) {
const llvm::MemoryBuffer *Buf = R.getSourceMgr().getBuffer(FID);
const char* C = Buf->getBufferStart();
const char* FileEnd = Buf->getBufferEnd();
assert (C <= FileEnd);
RewriteBuffer &RB = R.getEditBuffer(FID);
unsigned ColNo = 0;
for (unsigned FilePos = 0; C != FileEnd ; ++C, ++FilePos) {
switch (*C) {
default: ++ColNo; break;
case '\n':
case '\r':
ColNo = 0;
break;
case ' ':
if (EscapeSpaces)
RB.ReplaceText(FilePos, 1, " ");
++ColNo;
break;
case '\f':
RB.ReplaceText(FilePos, 1, "<hr>");
ColNo = 0;
break;
case '\t': {
if (!ReplaceTabs)
break;
unsigned NumSpaces = 8-(ColNo&7);
if (EscapeSpaces)
RB.ReplaceText(FilePos, 1,
StringRef(" "
" ", 6*NumSpaces));
else
RB.ReplaceText(FilePos, 1, StringRef(" ", NumSpaces));
ColNo += NumSpaces;
break;
}
case '<':
RB.ReplaceText(FilePos, 1, "<");
++ColNo;
break;
case '>':
RB.ReplaceText(FilePos, 1, ">");
++ColNo;
break;
case '&':
RB.ReplaceText(FilePos, 1, "&");
++ColNo;
break;
}
}
}
std::string html::EscapeText(StringRef s, bool EscapeSpaces, bool ReplaceTabs) {
unsigned len = s.size();
std::string Str;
llvm::raw_string_ostream os(Str);
for (unsigned i = 0 ; i < len; ++i) {
char c = s[i];
switch (c) {
default:
os << c; break;
case ' ':
if (EscapeSpaces) os << " ";
else os << ' ';
break;
case '\t':
if (ReplaceTabs) {
if (EscapeSpaces)
for (unsigned i = 0; i < 4; ++i)
os << " ";
else
for (unsigned i = 0; i < 4; ++i)
os << " ";
}
else
os << c;
break;
case '<': os << "<"; break;
case '>': os << ">"; break;
case '&': os << "&"; break;
}
}
return os.str();
}
static void AddLineNumber(RewriteBuffer &RB, unsigned LineNo,
unsigned B, unsigned E) {
SmallString<256> Str;
llvm::raw_svector_ostream OS(Str);
OS << "<tr><td class=\"num\" id=\"LN"
<< LineNo << "\">"
<< LineNo << "</td><td class=\"line\">";
if (B == E) { // Handle empty lines.
OS << " </td></tr>";
RB.InsertTextBefore(B, OS.str());
} else {
RB.InsertTextBefore(B, OS.str());
RB.InsertTextBefore(E, "</td></tr>");
}
}
void html::AddLineNumbers(Rewriter& R, FileID FID) {
const llvm::MemoryBuffer *Buf = R.getSourceMgr().getBuffer(FID);
const char* FileBeg = Buf->getBufferStart();
const char* FileEnd = Buf->getBufferEnd();
const char* C = FileBeg;
RewriteBuffer &RB = R.getEditBuffer(FID);
assert (C <= FileEnd);
unsigned LineNo = 0;
unsigned FilePos = 0;
while (C != FileEnd) {
++LineNo;
unsigned LineStartPos = FilePos;
unsigned LineEndPos = FileEnd - FileBeg;
assert (FilePos <= LineEndPos);
assert (C < FileEnd);
// Scan until the newline (or end-of-file).
while (C != FileEnd) {
char c = *C;
++C;
if (c == '\n') {
LineEndPos = FilePos++;
break;
}
++FilePos;
}
AddLineNumber(RB, LineNo, LineStartPos, LineEndPos);
}
// Add one big table tag that surrounds all of the code.
RB.InsertTextBefore(0, "<table class=\"code\">\n");
RB.InsertTextAfter(FileEnd - FileBeg, "</table>");
}
void html::AddHeaderFooterInternalBuiltinCSS(Rewriter& R, FileID FID,
const char *title) {
const llvm::MemoryBuffer *Buf = R.getSourceMgr().getBuffer(FID);
const char* FileStart = Buf->getBufferStart();
const char* FileEnd = Buf->getBufferEnd();
SourceLocation StartLoc = R.getSourceMgr().getLocForStartOfFile(FID);
SourceLocation EndLoc = StartLoc.getLocWithOffset(FileEnd-FileStart);
std::string s;
llvm::raw_string_ostream os(s);
os << "<!doctype html>\n" // Use HTML 5 doctype
"<html>\n<head>\n";
if (title)
os << "<title>" << html::EscapeText(title) << "</title>\n";
os << "<style type=\"text/css\">\n"
" body { color:#000000; background-color:#ffffff }\n"
" body { font-family:Helvetica, sans-serif; font-size:10pt }\n"
" h1 { font-size:14pt }\n"
" .code { border-collapse:collapse; width:100%; }\n"
" .code { font-family: \"Monospace\", monospace; font-size:10pt }\n"
" .code { line-height: 1.2em }\n"
" .comment { color: green; font-style: oblique }\n"
" .keyword { color: blue }\n"
" .string_literal { color: red }\n"
" .directive { color: darkmagenta }\n"
// Macro expansions.
" .expansion { display: none; }\n"
" .macro:hover .expansion { display: block; border: 2px solid #FF0000; "
"padding: 2px; background-color:#FFF0F0; font-weight: normal; "
" -webkit-border-radius:5px; -webkit-box-shadow:1px 1px 7px #000; "
"position: absolute; top: -1em; left:10em; z-index: 1 } \n"
" .macro { color: darkmagenta; background-color:LemonChiffon;"
// Macros are position: relative to provide base for expansions.
" position: relative }\n"
" .num { width:2.5em; padding-right:2ex; background-color:#eeeeee }\n"
" .num { text-align:right; font-size:8pt }\n"
" .num { color:#444444 }\n"
" .line { padding-left: 1ex; border-left: 3px solid #ccc }\n"
" .line { white-space: pre }\n"
" .msg { -webkit-box-shadow:1px 1px 7px #000 }\n"
" .msg { -webkit-border-radius:5px }\n"
" .msg { font-family:Helvetica, sans-serif; font-size:8pt }\n"
" .msg { float:left }\n"
" .msg { padding:0.25em 1ex 0.25em 1ex }\n"
" .msg { margin-top:10px; margin-bottom:10px }\n"
" .msg { font-weight:bold }\n"
" .msg { max-width:60em; word-wrap: break-word; white-space: pre-wrap }\n"
" .msgT { padding:0x; spacing:0x }\n"
" .msgEvent { background-color:#fff8b4; color:#000000 }\n"
" .msgControl { background-color:#bbbbbb; color:#000000 }\n"
" .mrange { background-color:#dfddf3 }\n"
" .mrange { border-bottom:1px solid #6F9DBE }\n"
" .PathIndex { font-weight: bold; padding:0px 5px; "
"margin-right:5px; }\n"
" .PathIndex { -webkit-border-radius:8px }\n"
" .PathIndexEvent { background-color:#bfba87 }\n"
" .PathIndexControl { background-color:#8c8c8c }\n"
" .PathNav a { text-decoration:none; font-size: larger }\n"
" .CodeInsertionHint { font-weight: bold; background-color: #10dd10 }\n"
" .CodeRemovalHint { background-color:#de1010 }\n"
" .CodeRemovalHint { border-bottom:1px solid #6F9DBE }\n"
" table.simpletable {\n"
" padding: 5px;\n"
" font-size:12pt;\n"
" margin:20px;\n"
" border-collapse: collapse; border-spacing: 0px;\n"
" }\n"
" td.rowname {\n"
" text-align:right; font-weight:bold; color:#444444;\n"
" padding-right:2ex; }\n"
"</style>\n</head>\n<body>";
// Generate header
R.InsertTextBefore(StartLoc, os.str());
// Generate footer
R.InsertTextAfter(EndLoc, "</body></html>\n");
}
/// SyntaxHighlight - Relex the specified FileID and annotate the HTML with
/// information about keywords, macro expansions etc. This uses the macro
/// table state from the end of the file, so it won't be perfectly perfect,
/// but it will be reasonably close.
void html::SyntaxHighlight(Rewriter &R, FileID FID, const Preprocessor &PP) {
RewriteBuffer &RB = R.getEditBuffer(FID);
const SourceManager &SM = PP.getSourceManager();
const llvm::MemoryBuffer *FromFile = SM.getBuffer(FID);
Lexer L(FID, FromFile, SM, PP.getLangOpts());
const char *BufferStart = L.getBuffer().data();
// Inform the preprocessor that we want to retain comments as tokens, so we
// can highlight them.
L.SetCommentRetentionState(true);
// Lex all the tokens in raw mode, to avoid entering #includes or expanding
// macros.
Token Tok;
L.LexFromRawLexer(Tok);
while (Tok.isNot(tok::eof)) {
// Since we are lexing unexpanded tokens, all tokens are from the main
// FileID.
unsigned TokOffs = SM.getFileOffset(Tok.getLocation());
unsigned TokLen = Tok.getLength();
switch (Tok.getKind()) {
default: break;
case tok::identifier:
llvm_unreachable("tok::identifier in raw lexing mode!");
case tok::raw_identifier: {
// Fill in Result.IdentifierInfo and update the token kind,
// looking up the identifier in the identifier table.
PP.LookUpIdentifierInfo(Tok);
// If this is a pp-identifier, for a keyword, highlight it as such.
if (Tok.isNot(tok::identifier))
HighlightRange(RB, TokOffs, TokOffs+TokLen, BufferStart,
"<span class='keyword'>", "</span>");
break;
}
case tok::comment:
HighlightRange(RB, TokOffs, TokOffs+TokLen, BufferStart,
"<span class='comment'>", "</span>");
break;
case tok::utf8_string_literal:
// Chop off the u part of u8 prefix
++TokOffs;
--TokLen;
// FALL THROUGH to chop the 8
case tok::wide_string_literal:
case tok::utf16_string_literal:
case tok::utf32_string_literal:
// Chop off the L, u, U or 8 prefix
++TokOffs;
--TokLen;
// FALL THROUGH.
case tok::string_literal:
// FIXME: Exclude the optional ud-suffix from the highlighted range.
HighlightRange(RB, TokOffs, TokOffs+TokLen, BufferStart,
"<span class='string_literal'>", "</span>");
break;
case tok::hash: {
// If this is a preprocessor directive, all tokens to end of line are too.
if (!Tok.isAtStartOfLine())
break;
// Eat all of the tokens until we get to the next one at the start of
// line.
unsigned TokEnd = TokOffs+TokLen;
L.LexFromRawLexer(Tok);
while (!Tok.isAtStartOfLine() && Tok.isNot(tok::eof)) {
TokEnd = SM.getFileOffset(Tok.getLocation())+Tok.getLength();
L.LexFromRawLexer(Tok);
}
// Find end of line. This is a hack.
HighlightRange(RB, TokOffs, TokEnd, BufferStart,
"<span class='directive'>", "</span>");
// Don't skip the next token.
continue;
}
}
L.LexFromRawLexer(Tok);
}
}
/// HighlightMacros - This uses the macro table state from the end of the
/// file, to re-expand macros and insert (into the HTML) information about the
/// macro expansions. This won't be perfectly perfect, but it will be
/// reasonably close.
void html::HighlightMacros(Rewriter &R, FileID FID, const Preprocessor& PP) {
// Re-lex the raw token stream into a token buffer.
const SourceManager &SM = PP.getSourceManager();
std::vector<Token> TokenStream;
const llvm::MemoryBuffer *FromFile = SM.getBuffer(FID);
Lexer L(FID, FromFile, SM, PP.getLangOpts());
// Lex all the tokens in raw mode, to avoid entering #includes or expanding
// macros.
while (1) {
Token Tok;
L.LexFromRawLexer(Tok);
// If this is a # at the start of a line, discard it from the token stream.
// We don't want the re-preprocess step to see #defines, #includes or other
// preprocessor directives.
if (Tok.is(tok::hash) && Tok.isAtStartOfLine())
continue;
// If this is a ## token, change its kind to unknown so that repreprocessing
// it will not produce an error.
if (Tok.is(tok::hashhash))
Tok.setKind(tok::unknown);
// If this raw token is an identifier, the raw lexer won't have looked up
// the corresponding identifier info for it. Do this now so that it will be
// macro expanded when we re-preprocess it.
if (Tok.is(tok::raw_identifier))
PP.LookUpIdentifierInfo(Tok);
TokenStream.push_back(Tok);
if (Tok.is(tok::eof)) break;
}
// Temporarily change the diagnostics object so that we ignore any generated
// diagnostics from this pass.
DiagnosticsEngine TmpDiags(PP.getDiagnostics().getDiagnosticIDs(),
&PP.getDiagnostics().getDiagnosticOptions(),
new IgnoringDiagConsumer);
// FIXME: This is a huge hack; we reuse the input preprocessor because we want
// its state, but we aren't actually changing it (we hope). This should really
// construct a copy of the preprocessor.
Preprocessor &TmpPP = const_cast<Preprocessor&>(PP);
DiagnosticsEngine *OldDiags = &TmpPP.getDiagnostics();
TmpPP.setDiagnostics(TmpDiags);
// Inform the preprocessor that we don't want comments.
TmpPP.SetCommentRetentionState(false, false);
// We don't want pragmas either. Although we filtered out #pragma, removing
// _Pragma and __pragma is much harder.
bool PragmasPreviouslyEnabled = TmpPP.getPragmasEnabled();
TmpPP.setPragmasEnabled(false);
// Enter the tokens we just lexed. This will cause them to be macro expanded
// but won't enter sub-files (because we removed #'s).
TmpPP.EnterTokenStream(TokenStream, false);
TokenConcatenation ConcatInfo(TmpPP);
// Lex all the tokens.
Token Tok;
TmpPP.Lex(Tok);
while (Tok.isNot(tok::eof)) {
// Ignore non-macro tokens.
if (!Tok.getLocation().isMacroID()) {
TmpPP.Lex(Tok);
continue;
}
// Okay, we have the first token of a macro expansion: highlight the
// expansion by inserting a start tag before the macro expansion and
// end tag after it.
std::pair<SourceLocation, SourceLocation> LLoc =
SM.getExpansionRange(Tok.getLocation());
// Ignore tokens whose instantiation location was not the main file.
if (SM.getFileID(LLoc.first) != FID) {
TmpPP.Lex(Tok);
continue;
}
assert(SM.getFileID(LLoc.second) == FID &&
"Start and end of expansion must be in the same ultimate file!");
std::string Expansion = EscapeText(TmpPP.getSpelling(Tok));
unsigned LineLen = Expansion.size();
Token PrevPrevTok;
Token PrevTok = Tok;
// Okay, eat this token, getting the next one.
TmpPP.Lex(Tok);
// Skip all the rest of the tokens that are part of this macro
// instantiation. It would be really nice to pop up a window with all the
// spelling of the tokens or something.
while (!Tok.is(tok::eof) &&
SM.getExpansionLoc(Tok.getLocation()) == LLoc.first) {
// Insert a newline if the macro expansion is getting large.
if (LineLen > 60) {
Expansion += "<br>";
LineLen = 0;
}
LineLen -= Expansion.size();
// If the tokens were already space separated, or if they must be to avoid
// them being implicitly pasted, add a space between them.
if (Tok.hasLeadingSpace() ||
ConcatInfo.AvoidConcat(PrevPrevTok, PrevTok, Tok))
Expansion += ' ';
// Escape any special characters in the token text.
Expansion += EscapeText(TmpPP.getSpelling(Tok));
LineLen += Expansion.size();
PrevPrevTok = PrevTok;
PrevTok = Tok;
TmpPP.Lex(Tok);
}
// Insert the expansion as the end tag, so that multi-line macros all get
// highlighted.
Expansion = "<span class='expansion'>" + Expansion + "</span></span>";
HighlightRange(R, LLoc.first, LLoc.second,
"<span class='macro'>", Expansion.c_str());
}
// Restore the preprocessor's old state.
TmpPP.setDiagnostics(*OldDiags);
TmpPP.setPragmasEnabled(PragmasPreviouslyEnabled);
}