FormatStringParsing.h revision 3c46e8db99196179b30e7ac5c20c4efd5f3926d7 
1#ifndef LLVM_CLANG_FORMAT_PARSING_H
2#define LLVM_CLANG_FORMAT_PARSING_H
3
4#include "clang/Analysis/Analyses/FormatString.h"
5#include "clang/AST/ASTContext.h"
6#include "clang/AST/Type.h"
7#include "llvm/Support/raw_ostream.h"
8
9namespace clang {
10
11template <typename T>
12class UpdateOnReturn {
13  T &ValueToUpdate;
14  const T &ValueToCopy;
15public:
16  UpdateOnReturn(T &valueToUpdate, const T &valueToCopy)
17    : ValueToUpdate(valueToUpdate), ValueToCopy(valueToCopy) {}
18
19  ~UpdateOnReturn() {
20    ValueToUpdate = ValueToCopy;
21  }
22};
23
24namespace analyze_format_string {
25
26OptionalAmount ParseAmount(const char *&Beg, const char *E);
27OptionalAmount ParseNonPositionAmount(const char *&Beg, const char *E,
28                                      unsigned &argIndex);
29
30OptionalAmount ParsePositionAmount(FormatStringHandler &H,
31                                   const char *Start, const char *&Beg,
32                                   const char *E, PositionContext p);
33
34bool ParseFieldWidth(FormatStringHandler &H,
35                     FormatSpecifier &CS,
36                     const char *Start, const char *&Beg, const char *E,
37                     unsigned *argIndex);
38
39bool ParseArgPosition(FormatStringHandler &H,
40                      FormatSpecifier &CS, const char *Start,
41                      const char *&Beg, const char *E);
42
43/// Returns true if a LengthModifier was parsed and installed in the
44/// FormatSpecifier& argument, and false otherwise.
45bool ParseLengthModifier(FormatSpecifier &FS, const char *&Beg, const char *E);
46
47template <typename T> class SpecifierResult {
48  T FS;
49  const char *Start;
50  bool Stop;
51public:
52  SpecifierResult(bool stop = false)
53  : Start(0), Stop(stop) {}
54  SpecifierResult(const char *start,
55                  const T &fs)
56  : FS(fs), Start(start), Stop(false) {}
57
58  const char *getStart() const { return Start; }
59  bool shouldStop() const { return Stop; }
60  bool hasValue() const { return Start != 0; }
61  const T &getValue() const {
62    assert(hasValue());
63    return FS;
64  }
65  const T &getValue() { return FS; }
66};
67
68} // end analyze_format_string namespace
69} // end clang namespace
70
71#endif
72
73