Add clang-format binary to cfe.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@177506 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 152 insertions, 0 deletions

diff --git a/tools/clang-format/ClangFormat.cpp b/tools/clang-format/ClangFormat.cpp
new file mode 100644
index 0000000000..c4969b2c08
--- /dev/null
+++ b/tools/clang-format/ClangFormat.cpp
@@ -0,0 +1,152 @@
+//===-- clang-format/ClangFormat.cpp - Clang format tool ------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// \brief This file implements a clang-format tool that automatically formats
+/// (fragments of) C++ code.
+///
+//===----------------------------------------------------------------------===//
+
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/DiagnosticOptions.h"
+#include "clang/Basic/FileManager.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Format/Format.h"
+#include "clang/Lex/Lexer.h"
+#include "clang/Rewrite/Core/Rewriter.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/Signals.h"
+
+using namespace llvm;
+
+static cl::opt<bool> Help("h", cl::desc("Alias for -help"), cl::Hidden);
+
+static cl::list<int> Offsets(
+    "offset", cl::desc("Format a range starting at this file offset."));
+static cl::list<int> Lengths(
+    "length", cl::desc("Format a range of this length, -1 for end of file."));
+static cl::opt<std::string> Style(
+    "style",
+    cl::desc("Coding style, currently supports: LLVM, Google, Chromium."),
+    cl::init("LLVM"));
+static cl::opt<bool> Inplace("i",
+                             cl::desc("Inplace edit <file>, if specified."));
+
+static cl::opt<bool> OutputXML(
+    "output-replacements-xml", cl::desc("Output replacements as XML."));
+
+static cl::opt<std::string> FileName(cl::Positional, cl::desc("[<file>]"),
+                                     cl::init("-"));
+
+namespace clang {
+namespace format {
+
+static FileID createInMemoryFile(StringRef FileName, const MemoryBuffer *Source,
+                                 SourceManager &Sources, FileManager &Files) {
+  const FileEntry *Entry = Files.getVirtualFile(FileName == "-" ? "<stdin>" :
+                                                    FileName,
+                                                Source->getBufferSize(), 0);
+  Sources.overrideFileContents(Entry, Source, true);
+  return Sources.createFileID(Entry, SourceLocation(), SrcMgr::C_User);
+}
+
+static FormatStyle getStyle() {
+  FormatStyle TheStyle = getGoogleStyle();
+  if (Style == "LLVM")
+    TheStyle = getLLVMStyle();
+  if (Style == "Chromium")
+    TheStyle = getChromiumStyle();
+  return TheStyle;
+}
+
+static void format() {
+  FileManager Files((FileSystemOptions()));
+  DiagnosticsEngine Diagnostics(
+      IntrusiveRefCntPtr<DiagnosticIDs>(new DiagnosticIDs),
+      new DiagnosticOptions);
+  SourceManager Sources(Diagnostics, Files);
+  OwningPtr<MemoryBuffer> Code;
+  if (error_code ec = MemoryBuffer::getFileOrSTDIN(FileName, Code)) {
+    llvm::errs() << ec.message() << "\n";
+    return;
+  }
+  FileID ID = createInMemoryFile(FileName, Code.get(), Sources, Files);
+  Lexer Lex(ID, Sources.getBuffer(ID), Sources, getFormattingLangOpts());
+  if (Offsets.empty())
+    Offsets.push_back(0);
+  if (Offsets.size() != Lengths.size() &&
+      !(Offsets.size() == 1 && Lengths.empty())) {
+    llvm::errs() << "Number of -offset and -length arguments must match.\n";
+    return;
+  }
+  std::vector<CharSourceRange> Ranges;
+  for (cl::list<int>::size_type i = 0, e = Offsets.size(); i != e; ++i) {
+    SourceLocation Start =
+        Sources.getLocForStartOfFile(ID).getLocWithOffset(Offsets[i]);
+    SourceLocation End;
+    if (i < Lengths.size()) {
+      End = Start.getLocWithOffset(Lengths[i]);
+    } else {
+      End = Sources.getLocForEndOfFile(ID);
+    }
+    Ranges.push_back(CharSourceRange::getCharRange(Start, End));
+  }
+  tooling::Replacements Replaces = reformat(getStyle(), Lex, Sources, Ranges);
+  if (OutputXML) {
+    llvm::outs() << "<?xml version='1.0'?>\n<replacements xml:space='preserve'>\n";
+    for (tooling::Replacements::const_iterator I = Replaces.begin(),
+                                               E = Replaces.end();
+         I != E; ++I) {
+      llvm::outs() << "<replacement "
+                   << "offset='" << I->getOffset() << "' "
+                   << "length='" << I->getLength() << "'>"
+                   << I->getReplacementText() << "</replacement>\n";
+    }
+    llvm::outs() << "</replacements>\n";
+  } else {
+    Rewriter Rewrite(Sources, LangOptions());
+    tooling::applyAllReplacements(Replaces, Rewrite);
+    if (Inplace) {
+      if (Replaces.size() == 0)
+        return; // Nothing changed, don't touch the file.
+
+      std::string ErrorInfo;
+      llvm::raw_fd_ostream FileStream(FileName.c_str(), ErrorInfo,
+                                      llvm::raw_fd_ostream::F_Binary);
+      if (!ErrorInfo.empty()) {
+        llvm::errs() << "Error while writing file: " << ErrorInfo << "\n";
+        return;
+      }
+      Rewrite.getEditBuffer(ID).write(FileStream);
+      FileStream.flush();
+    } else {
+      Rewrite.getEditBuffer(ID).write(outs());
+    }
+  }
+}
+
+}  // namespace format
+}  // namespace clang
+
+int main(int argc, const char **argv) {
+  llvm::sys::PrintStackTraceOnErrorSignal();
+  cl::ParseCommandLineOptions(
+      argc, argv,
+      "A tool to format C/C++/Obj-C code.\n\n"
+      "Currently supports LLVM and Google style guides.\n"
+      "If no arguments are specified, it formats the code from standard input\n"
+      "and writes the result to the standard output.\n"
+      "If <file> is given, it reformats the file. If -i is specified together\n"
+      "with <file>, the file is edited in-place. Otherwise, the result is\n"
+      "written to the standard output.\n");
+  if (Help)
+    cl::PrintHelpMessage();
+  clang::format::format();
+  return 0;
+}