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 << '.' << *Minor; 33 if (Optional<unsigned> Subminor = V.getSubminor()) 34 Out << '.' << *Subminor; 35 return Out; 36 } 37 38 static bool parseInt(StringRef &input, unsigned &value) { 39 assert(value == 0); 40 if (input.empty()) return true; 41 42 char next = input[0]; 43 input = input.substr(1); 44 if (next < '0' || next > '9') return true; 45 value = (unsigned) (next - '0'); 46 47 while (!input.empty()) { 48 next = input[0]; 49 if (next < '0' || next > '9') return false; 50 input = input.substr(1); 51 value = value * 10 + (unsigned) (next - '0'); 52 } 53 54 return false; 55 } 56 57 bool VersionTuple::tryParse(StringRef input) { 58 unsigned major = 0, minor = 0, micro = 0; 59 60 // Parse the major version, [0-9]+ 61 if (parseInt(input, major)) return true; 62 63 if (input.empty()) { 64 *this = VersionTuple(major); 65 return false; 66 } 67 68 // If we're not done, parse the minor version, \.[0-9]+ 69 if (input[0] != '.') return true; 70 input = input.substr(1); 71 if (parseInt(input, minor)) return true; 72 73 if (input.empty()) { 74 *this = VersionTuple(major, minor); 75 return false; 76 } 77 78 // If we're not done, parse the micro version, \.[0-9]+ 79 if (input[0] != '.') return true; 80 input = input.substr(1); 81 if (parseInt(input, micro)) return true; 82 83 // If we have characters left over, it's an error. 84 if (!input.empty()) return true; 85 86 *this = VersionTuple(major, minor, micro); 87 return false; 88 } 89
