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//== 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 clas, which is used to translate the
// text of a source file into prettified HTML.
//
//===----------------------------------------------------------------------===//
#include "clang/Rewrite/Rewriter.h"
#include "clang/Rewrite/HTMLRewrite.h"
#include "clang/Basic/SourceManager.h"
#include "llvm/Support/MemoryBuffer.h"
#include <sstream>
using namespace clang;
//===----------------------------------------------------------------------===//
// Basic operations.
//===----------------------------------------------------------------------===//
void html::EscapeText(Rewriter& R, unsigned FileID, bool EscapeSpaces) {
const llvm::MemoryBuffer *Buf = R.getSourceMgr().getBuffer(FileID);
const char* C = Buf->getBufferStart();
const char* FileEnd = Buf->getBufferEnd();
assert (C <= FileEnd);
for (unsigned FilePos = 0; C != FileEnd ; ++C, ++FilePos) {
SourceLocation Loc = SourceLocation::getFileLoc(FileID, FilePos);
switch (*C) {
default: break;
case ' ':
if (EscapeSpaces) R.ReplaceText(Loc, 1, " ", 5);
break;
case '<': R.ReplaceText(Loc, 1, "<", 4); break;
case '>': R.ReplaceText(Loc, 1, ">", 4); break;
case '&': R.ReplaceText(Loc, 1, "&", 5); break;
}
}
}
static void TagOpen(Rewriter& R, const char* TagStr,
const char* Attr, const char* Content,
SourceLocation L, bool InsertBefore) {
std::ostringstream os;
os << '<' << TagStr;
if (Attr) os << ' ' << Attr;
os << '>';
if (Content) os << Content;
if (InsertBefore)
R.InsertTextBefore(L, os.str().c_str(), os.str().size());
else
R.InsertTextAfter(L, os.str().c_str(), os.str().size());
}
static void TagClose(Rewriter& R, const char* TagStr, SourceLocation L,
bool Newline, bool InsertBefore) {
std::ostringstream os;
os << "</" << TagStr << ">";
if (Newline) os << '\n';
if (InsertBefore)
R.InsertTextBefore(L, os.str().c_str(), os.str().size());
else
R.InsertTextAfter(L, os.str().c_str(), os.str().size());
}
void html::InsertTag(Rewriter& R, html::Tags tag,
SourceLocation B, SourceLocation E,
const char* Attr, const char* Content, bool Newline,
bool OpenInsertBefore, bool CloseInsertBefore) {
const char* TagStr = 0;
switch (tag) {
default: break;
case BODY: TagStr = "body"; break;
case DIV: TagStr = "div"; break;
case HEAD: TagStr = "head"; break;
case HTML: TagStr = "html"; break;
case PRE: TagStr = "pre"; break;
case SPAN: TagStr = "span"; break;
case STYLE: TagStr = "style"; break;
}
assert (TagStr && "Tag not supported.");
// Generate the opening tag. We also generate the closing
// tag of the start and end SourceLocations are the same.
if (OpenInsertBefore) {
TagClose(R, TagStr, E, Newline, CloseInsertBefore);
TagOpen(R, TagStr, Attr, Content, B, true);
}
else {
TagOpen(R, TagStr, Attr, Content, B, false);
TagClose(R, TagStr, E, Newline, true);
}
}
//===----------------------------------------------------------------------===//
// High-level operations.
//===----------------------------------------------------------------------===//
static void AddLineNumber(Rewriter& R, unsigned LineNo,
SourceLocation B, SourceLocation E) {
// Add two "div" tags: one to contain the line number, and the other
// to contain the content of the line.
std::ostringstream os;
os << LineNo;
html::InsertTag(R, html::SPAN, B, E, "style=lines");
html::InsertTag(R, html::SPAN, B, B, "style=nums", os.str().c_str());
}
void html::AddLineNumbers(Rewriter& R, unsigned FileID) {
const llvm::MemoryBuffer *Buf = R.getSourceMgr().getBuffer(FileID);
const char* FileBeg = Buf->getBufferStart();
const char* FileEnd = Buf->getBufferEnd();
const char* C = FileBeg;
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).
for ( ; C != FileEnd ; ++C, ++FilePos)
if (*C == '\n') {
LineEndPos = FilePos;
break;
}
AddLineNumber(R, LineNo,
SourceLocation::getFileLoc(FileID, LineStartPos),
SourceLocation::getFileLoc(FileID, LineEndPos));
if (C != FileEnd) {
++C;
++FilePos;
}
}
}
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