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//===----------------------------------------------------------------------===//
14#include "clang/Basic/VersionTuple.h"
15#include "llvm/Support/raw_ostream.h"
16
17using namespace clang;
18
19std::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
28raw_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
40static 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
59bool 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}
101