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 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 } 101
