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 {
30namespace index {
31
32/// \brief A small class to be used by libclang clients to format
33/// a declaration string in memory. This object is instantiated once
34/// and used each time a formatting is needed.
35class SimpleFormatContext {
36public:
37  SimpleFormatContext(LangOptions Options)
38      : DiagOpts(new DiagnosticOptions()),
39        Diagnostics(new DiagnosticsEngine(new DiagnosticIDs,
40                                          DiagOpts.getPtr())),
41        Files((FileSystemOptions())),
42        Sources(*Diagnostics, Files),
43        Rewrite(Sources, Options) {
44    Diagnostics->setClient(new IgnoringDiagConsumer, true);
45  }
46
47  ~SimpleFormatContext() { }
48
49  FileID createInMemoryFile(StringRef Name, StringRef Content) {
50    const llvm::MemoryBuffer *Source =
51        llvm::MemoryBuffer::getMemBuffer(Content);
52    const FileEntry *Entry =
53        Files.getVirtualFile(Name, Source->getBufferSize(), 0);
54    Sources.overrideFileContents(Entry, Source, true);
55    assert(Entry != NULL);
56    return Sources.createFileID(Entry, SourceLocation(), SrcMgr::C_User);
57  }
58
59  std::string getRewrittenText(FileID ID) {
60    std::string Result;
61    llvm::raw_string_ostream OS(Result);
62    Rewrite.getEditBuffer(ID).write(OS);
63    OS.flush();
64    return Result;
65  }
66
67  IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts;
68  IntrusiveRefCntPtr<DiagnosticsEngine> Diagnostics;
69  FileManager Files;
70  SourceManager Sources;
71  Rewriter Rewrite;
72};
73
74} // end namespace index
75} // end namespace clang
76
77#endif
78