clang  6.0.0svn
VersionTuple.cpp
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1 //===- VersionTuple.cpp - Version Number Handling ---------------*- 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 // This file implements the VersionTuple class, which represents a version in
11 // the form major[.minor[.subminor]].
12 //
13 //===----------------------------------------------------------------------===//
15 #include "llvm/Support/raw_ostream.h"
16 
17 using namespace clang;
18 
19 std::string VersionTuple::getAsString() const {
20  std::string Result;
21  {
22  llvm::raw_string_ostream Out(Result);
23  Out << *this;
24  }
25  return Result;
26 }
27 
28 raw_ostream& clang::operator<<(raw_ostream &Out,
29  const VersionTuple &V) {
30  Out << V.getMajor();
31  if (Optional<unsigned> Minor = V.getMinor())
32  Out << (V.usesUnderscores() ? '_' : '.') << *Minor;
33  if (Optional<unsigned> Subminor = V.getSubminor())
34  Out << (V.usesUnderscores() ? '_' : '.') << *Subminor;
35  if (Optional<unsigned> Build = V.getBuild())
36  Out << (V.usesUnderscores() ? '_' : '.') << *Build;
37  return Out;
38 }
39 
40 static bool parseInt(StringRef &input, unsigned &value) {
41  assert(value == 0);
42  if (input.empty()) return true;
43 
44  char next = input[0];
45  input = input.substr(1);
46  if (next < '0' || next > '9') return true;
47  value = (unsigned) (next - '0');
48 
49  while (!input.empty()) {
50  next = input[0];
51  if (next < '0' || next > '9') return false;
52  input = input.substr(1);
53  value = value * 10 + (unsigned) (next - '0');
54  }
55 
56  return false;
57 }
58 
59 bool VersionTuple::tryParse(StringRef input) {
60  unsigned major = 0, minor = 0, micro = 0, build = 0;
61 
62  // Parse the major version, [0-9]+
63  if (parseInt(input, major)) return true;
64 
65  if (input.empty()) {
66  *this = VersionTuple(major);
67  return false;
68  }
69 
70  // If we're not done, parse the minor version, \.[0-9]+
71  if (input[0] != '.') return true;
72  input = input.substr(1);
73  if (parseInt(input, minor)) return true;
74 
75  if (input.empty()) {
76  *this = VersionTuple(major, minor);
77  return false;
78  }
79 
80  // If we're not done, parse the micro version, \.[0-9]+
81  if (input[0] != '.') return true;
82  input = input.substr(1);
83  if (parseInt(input, micro)) return true;
84 
85  if (input.empty()) {
86  *this = VersionTuple(major, minor, micro);
87  return false;
88  }
89 
90  // If we're not done, parse the micro version, \.[0-9]+
91  if (input[0] != '.') return true;
92  input = input.substr(1);
93  if (parseInt(input, build)) return true;
94 
95  // If we have characters left over, it's an error.
96  if (!input.empty()) return true;
97 
98  *this = VersionTuple(major, minor, micro, build);
99  return false;
100 }
Optional< unsigned > getBuild() const
Retrieve the build version number, if provided.
Definition: VersionTuple.h:91
Represents a version number in the form major[.minor[.subminor[.build]]].
Definition: VersionTuple.h:26
const DiagnosticBuilder & operator<<(const DiagnosticBuilder &DB, const Attr *At)
Definition: Attr.h:195
bool usesUnderscores() const
Definition: VersionTuple.h:97
Optional< unsigned > getMinor() const
Retrieve the minor version number, if provided.
Definition: VersionTuple.h:77
The result type of a method or function.
static bool parseInt(StringRef &input, unsigned &value)
Dataflow Directional Tag Classes.
Optional< unsigned > getSubminor() const
Retrieve the subminor version number, if provided.
Definition: VersionTuple.h:84
bool tryParse(StringRef string)
Try to parse the given string as a version number.
unsigned getMajor() const
Retrieve the major version number.
Definition: VersionTuple.h:74
std::string getAsString() const
Retrieve a string representation of the version number.
Defines the clang::VersionTuple class, which represents a version in the form major[.minor[.subminor]].