1 //===- VersionTuple.cpp - Version Number Handling ---------------*- C++ -*-===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
9 // This file implements the VersionTuple class, which represents a version in
10 // the form major[.minor[.subminor]].
12 //===----------------------------------------------------------------------===//
13 #include "llvm/Support/VersionTuple.h"
14 #include "llvm/Support/raw_ostream.h"
18 std::string VersionTuple::getAsString() const {
21 llvm::raw_string_ostream Out(Result);
27 raw_ostream &llvm::operator<<(raw_ostream &Out, const VersionTuple &V) {
29 if (Optional<unsigned> Minor = V.getMinor())
31 if (Optional<unsigned> Subminor = V.getSubminor())
32 Out << '.' << *Subminor;
33 if (Optional<unsigned> Build = V.getBuild())
38 static bool parseInt(StringRef &input, unsigned &value) {
44 input = input.substr(1);
45 if (next < '0' || next > '9')
47 value = (unsigned)(next - '0');
49 while (!input.empty()) {
51 if (next < '0' || next > '9')
53 input = input.substr(1);
54 value = value * 10 + (unsigned)(next - '0');
60 bool VersionTuple::tryParse(StringRef input) {
61 unsigned major = 0, minor = 0, micro = 0, build = 0;
63 // Parse the major version, [0-9]+
64 if (parseInt(input, major))
68 *this = VersionTuple(major);
72 // If we're not done, parse the minor version, \.[0-9]+
75 input = input.substr(1);
76 if (parseInt(input, minor))
80 *this = VersionTuple(major, minor);
84 // If we're not done, parse the micro version, \.[0-9]+
87 input = input.substr(1);
88 if (parseInt(input, micro))
92 *this = VersionTuple(major, minor, micro);
96 // If we're not done, parse the micro version, \.[0-9]+
99 input = input.substr(1);
100 if (parseInt(input, build))
103 // If we have characters left over, it's an error.
107 *this = VersionTuple(major, minor, micro, build);