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 "llvm/Support/VersionTuple.h"
15 #include "llvm/Support/raw_ostream.h"
16
17 using namespace llvm;
18
getAsString() const19 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
operator <<(raw_ostream & Out,const VersionTuple & V)28 raw_ostream &llvm::operator<<(raw_ostream &Out, const VersionTuple &V) {
29 Out << V.getMajor();
30 if (Optional<unsigned> Minor = V.getMinor())
31 Out << '.' << *Minor;
32 if (Optional<unsigned> Subminor = V.getSubminor())
33 Out << '.' << *Subminor;
34 if (Optional<unsigned> Build = V.getBuild())
35 Out << '.' << *Build;
36 return Out;
37 }
38
parseInt(StringRef & input,unsigned & value)39 static bool parseInt(StringRef &input, unsigned &value) {
40 assert(value == 0);
41 if (input.empty())
42 return true;
43
44 char next = input[0];
45 input = input.substr(1);
46 if (next < '0' || next > '9')
47 return true;
48 value = (unsigned)(next - '0');
49
50 while (!input.empty()) {
51 next = input[0];
52 if (next < '0' || next > '9')
53 return false;
54 input = input.substr(1);
55 value = value * 10 + (unsigned)(next - '0');
56 }
57
58 return false;
59 }
60
tryParse(StringRef input)61 bool VersionTuple::tryParse(StringRef input) {
62 unsigned major = 0, minor = 0, micro = 0, build = 0;
63
64 // Parse the major version, [0-9]+
65 if (parseInt(input, major))
66 return true;
67
68 if (input.empty()) {
69 *this = VersionTuple(major);
70 return false;
71 }
72
73 // If we're not done, parse the minor version, \.[0-9]+
74 if (input[0] != '.')
75 return true;
76 input = input.substr(1);
77 if (parseInt(input, minor))
78 return true;
79
80 if (input.empty()) {
81 *this = VersionTuple(major, minor);
82 return false;
83 }
84
85 // If we're not done, parse the micro version, \.[0-9]+
86 if (input[0] != '.')
87 return true;
88 input = input.substr(1);
89 if (parseInt(input, micro))
90 return true;
91
92 if (input.empty()) {
93 *this = VersionTuple(major, minor, micro);
94 return false;
95 }
96
97 // If we're not done, parse the micro version, \.[0-9]+
98 if (input[0] != '.')
99 return true;
100 input = input.substr(1);
101 if (parseInt(input, build))
102 return true;
103
104 // If we have characters left over, it's an error.
105 if (!input.empty())
106 return true;
107
108 *this = VersionTuple(major, minor, micro, build);
109 return false;
110 }
111