1 //===- VersionTuple.cpp - Version Number Handling ---------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the VersionTuple class, which represents a version in
11 // the form major[.minor[.subminor]].
13 //===----------------------------------------------------------------------===//
14 #include "llvm/Support/VersionTuple.h"
15 #include "llvm/Support/raw_ostream.h"
19 std::string VersionTuple::getAsString() const {
22 llvm::raw_string_ostream Out(Result);
28 raw_ostream &llvm::operator<<(raw_ostream &Out, const VersionTuple &V) {
30 if (Optional<unsigned> Minor = V.getMinor())
32 if (Optional<unsigned> Subminor = V.getSubminor())
33 Out << '.' << *Subminor;
34 if (Optional<unsigned> Build = V.getBuild())
39 static bool parseInt(StringRef &input, unsigned &value) {
45 input = input.substr(1);
46 if (next < '0' || next > '9')
48 value = (unsigned)(next - '0');
50 while (!input.empty()) {
52 if (next < '0' || next > '9')
54 input = input.substr(1);
55 value = value * 10 + (unsigned)(next - '0');
61 bool VersionTuple::tryParse(StringRef input) {
62 unsigned major = 0, minor = 0, micro = 0, build = 0;
64 // Parse the major version, [0-9]+
65 if (parseInt(input, major))
69 *this = VersionTuple(major);
73 // If we're not done, parse the minor version, \.[0-9]+
76 input = input.substr(1);
77 if (parseInt(input, minor))
81 *this = VersionTuple(major, minor);
85 // If we're not done, parse the micro version, \.[0-9]+
88 input = input.substr(1);
89 if (parseInt(input, micro))
93 *this = VersionTuple(major, minor, micro);
97 // If we're not done, parse the micro version, \.[0-9]+
100 input = input.substr(1);
101 if (parseInt(input, build))
104 // If we have characters left over, it's an error.
108 *this = VersionTuple(major, minor, micro, build);