40 static bool parseInt(StringRef &input, unsigned &value) {  in parseInt()  argument
42   if (input.empty()) return true;  in parseInt()
44   char next = input[0];  in parseInt()
45   input = input.substr(1);  in parseInt()
49   while (!input.empty()) {  in parseInt()
50     next = input[0];  in parseInt()
52     input = input.substr(1);  in parseInt()
59 bool VersionTuple::tryParse(StringRef input) {  in tryParse()  argument
63   if (parseInt(input, major)) return true;  in tryParse()
65   if (input.empty()) {  in tryParse()
71   if (input[0] != '.') return true;  in tryParse()
72   input = input.substr(1);  in tryParse()
73   if (parseInt(input, minor)) return true;  in tryParse()
75   if (input.empty()) {  in tryParse()
81   if (input[0] != '.') return true;  in tryParse()
82   input = input.substr(1);  in tryParse()
83   if (parseInt(input, micro)) return true;  in tryParse()
85   if (input.empty()) {  in tryParse()
91   if (input[0] != '.') return true;  in tryParse()
92   input = input.substr(1);  in tryParse()
93   if (parseInt(input, build)) return true;  in tryParse()
96   if (!input.empty()) return true;  in tryParse()