1//===--- SimpleFormatContext.h ----------------------------------*- 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/// \file
11///
12/// \brief Defines a utility class for use of clang-format in libclang
13//
14//===----------------------------------------------------------------------===//
15
16#ifndef LLVM_CLANG_SIMPLE_FORM_CONTEXT_H
17#define LLVM_CLANG_SIMPLE_FORM_CONTEXT_H
18
19#include "clang/Basic/Diagnostic.h"
20#include "clang/Basic/DiagnosticOptions.h"
21#include "clang/Basic/FileManager.h"
22#include "clang/Basic/LangOptions.h"
23#include "clang/Basic/SourceManager.h"
24#include "clang/Rewrite/Core/Rewriter.h"
25#include "llvm/Support/FileSystem.h"
26#include "llvm/Support/Path.h"
27#include "llvm/Support/raw_ostream.h"
28
29namespace clang {
30
31/// \brief A small class to be used by libclang clients to format
32/// a declaration string in memory. This object is instantiated once
33/// and used each time a formatting is needed.
34class SimpleFormatContext {
35public:
36  SimpleFormatContext(LangOptions Options)
37      : DiagOpts(new DiagnosticOptions()),
38        Diagnostics(new DiagnosticsEngine(new DiagnosticIDs,
39                                          DiagOpts.getPtr())),
40        Files((FileSystemOptions())),
41        Sources(*Diagnostics, Files),
42        Rewrite(Sources, Options) {
43    Diagnostics->setClient(new IgnoringDiagConsumer, true);
44  }
45
46  ~SimpleFormatContext() { }
47
48  FileID createInMemoryFile(StringRef Name, StringRef Content) {
49    const llvm::MemoryBuffer *Source =
50      llvm::MemoryBuffer::getMemBuffer(Content);
51    const FileEntry *Entry =
52      Files.getVirtualFile(Name, Source->getBufferSize(), 0);
53    Sources.overrideFileContents(Entry, Source, true);
54    assert(Entry != NULL);
55    return Sources.createFileID(Entry, SourceLocation(), SrcMgr::C_User);
56  }
57
58  std::string getRewrittenText(FileID ID) {
59    std::string Result;
60    llvm::raw_string_ostream OS(Result);
61    Rewrite.getEditBuffer(ID).write(OS);
62    OS.flush();
63    return Result;
64  }
65
66  IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts;
67  IntrusiveRefCntPtr<DiagnosticsEngine> Diagnostics;
68  FileManager Files;
69  SourceManager Sources;
70  Rewriter Rewrite;
71};
72
73} // end namespace clang
74
75#endif
76