forked from OSchip/llvm-project
133 lines
4.7 KiB
C++
133 lines
4.7 KiB
C++
//===-- clang-format/ClangFormat.cpp - Clang format tool ------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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///
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/// \file
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/// \brief This file implements a clang-format tool that automatically formats
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/// (fragments of) C++ code.
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///
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//===----------------------------------------------------------------------===//
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#include "clang/Basic/Diagnostic.h"
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#include "clang/Basic/DiagnosticOptions.h"
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#include "clang/Basic/FileManager.h"
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#include "clang/Basic/SourceManager.h"
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#include "clang/Format/Format.h"
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#include "clang/Lex/Lexer.h"
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#include "clang/Rewrite/Core/Rewriter.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/Signals.h"
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using namespace llvm;
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static cl::opt<bool> Help("h", cl::desc("Alias for -help"), cl::Hidden);
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static cl::opt<int> Offset(
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"offset", cl::desc("Format a range starting at this file offset."),
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cl::init(0));
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static cl::opt<int> Length(
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"length", cl::desc("Format a range of this length, -1 for end of file."),
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cl::init(-1));
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static cl::opt<std::string> Style(
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"style",
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cl::desc("Coding style, currently supports: LLVM, Google, Chromium."),
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cl::init("LLVM"));
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static cl::opt<bool> Inplace("i",
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cl::desc("Inplace edit <file>, if specified."));
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// FIXME: Remove this when styles are configurable through files.
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static cl::opt<bool> InvertPointerBinding(
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"invert-pointer-binding", cl::desc("Inverts the side to which */& bind"),
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cl::init(false));
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static cl::opt<std::string> FileName(cl::Positional, cl::desc("[<file>]"),
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cl::init("-"));
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namespace clang {
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namespace format {
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static FileID createInMemoryFile(StringRef FileName, const MemoryBuffer *Source,
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SourceManager &Sources, FileManager &Files) {
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const FileEntry *Entry = Files.getVirtualFile(FileName == "-" ? "<stdin>" :
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FileName,
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Source->getBufferSize(), 0);
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Sources.overrideFileContents(Entry, Source, true);
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return Sources.createFileID(Entry, SourceLocation(), SrcMgr::C_User);
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}
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static FormatStyle getStyle() {
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FormatStyle TheStyle = getGoogleStyle();
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if (Style == "LLVM")
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TheStyle = getLLVMStyle();
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if (Style == "Chromium")
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TheStyle = getChromiumStyle();
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if (InvertPointerBinding) {
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TheStyle.PointerAndReferenceBindToType =
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!TheStyle.PointerAndReferenceBindToType;
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}
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return TheStyle;
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}
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static void format() {
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FileManager Files((FileSystemOptions()));
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DiagnosticsEngine Diagnostics(
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IntrusiveRefCntPtr<DiagnosticIDs>(new DiagnosticIDs),
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new DiagnosticOptions);
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SourceManager Sources(Diagnostics, Files);
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OwningPtr<MemoryBuffer> Code;
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if (error_code ec = MemoryBuffer::getFileOrSTDIN(FileName, Code)) {
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llvm::errs() << ec.message() << "\n";
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return;
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}
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FileID ID = createInMemoryFile(FileName, Code.get(), Sources, Files);
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Lexer Lex(ID, Sources.getBuffer(ID), Sources, getFormattingLangOpts());
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SourceLocation Start =
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Sources.getLocForStartOfFile(ID).getLocWithOffset(Offset);
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SourceLocation End = Sources.getLocForEndOfFile(ID);
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if (Length != -1)
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End = Start.getLocWithOffset(Length);
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std::vector<CharSourceRange> Ranges(
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1, CharSourceRange::getCharRange(Start, End));
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tooling::Replacements Replaces = reformat(getStyle(), Lex, Sources, Ranges);
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Rewriter Rewrite(Sources, LangOptions());
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tooling::applyAllReplacements(Replaces, Rewrite);
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if (Inplace) {
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std::string ErrorInfo;
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llvm::raw_fd_ostream FileStream(FileName.c_str(), ErrorInfo,
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llvm::raw_fd_ostream::F_Binary);
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if (!ErrorInfo.empty()) {
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llvm::errs() << "Error while writing file: " << ErrorInfo << "\n";
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return;
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}
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Rewrite.getEditBuffer(ID).write(FileStream);
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FileStream.flush();
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} else {
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Rewrite.getEditBuffer(ID).write(outs());
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}
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}
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} // namespace format
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} // namespace clang
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int main(int argc, const char **argv) {
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llvm::sys::PrintStackTraceOnErrorSignal();
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cl::ParseCommandLineOptions(
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argc, argv,
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"A tool to format C/C++/Obj-C code.\n\n"
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"Currently supports LLVM and Google style guides.\n"
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"If no arguments are specified, it formats the code from standard input\n"
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"and writes the result to the standard output.\n"
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"If <file> is given, it reformats the file. If -i is specified together\n"
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"with <file>, the file is edited in-place. Otherwise, the result is\n"
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"written to the standard output.\n");
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if (Help)
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cl::PrintHelpMessage();
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clang::format::format();
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return 0;
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}
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