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//===- VersionTuple.cpp - Version Number Handling ---------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the VersionTuple class, which represents a version in
// the form major[.minor[.subminor]].
//
//===----------------------------------------------------------------------===//
#include "llvm/Support/VersionTuple.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
std::string VersionTuple::getAsString() const {
std::string Result;
{
llvm::raw_string_ostream Out(Result);
Out << *this;
}
return Result;
}
raw_ostream &llvm::operator<<(raw_ostream &Out, const VersionTuple &V) {
Out << V.getMajor();
if (Optional<unsigned> Minor = V.getMinor())
Out << '.' << *Minor;
if (Optional<unsigned> Subminor = V.getSubminor())
Out << '.' << *Subminor;
if (Optional<unsigned> Build = V.getBuild())
Out << '.' << *Build;
return Out;
}
static bool parseInt(StringRef &input, unsigned &value) {
assert(value == 0);
if (input.empty())
return true;
char next = input[0];
input = input.substr(1);
if (next < '0' || next > '9')
return true;
value = (unsigned)(next - '0');
while (!input.empty()) {
next = input[0];
if (next < '0' || next > '9')
return false;
input = input.substr(1);
value = value * 10 + (unsigned)(next - '0');
}
return false;
}
bool VersionTuple::tryParse(StringRef input) {
unsigned major = 0, minor = 0, micro = 0, build = 0;
// Parse the major version, [0-9]+
if (parseInt(input, major))
return true;
if (input.empty()) {
*this = VersionTuple(major);
return false;
}
// If we're not done, parse the minor version, \.[0-9]+
if (input[0] != '.')
return true;
input = input.substr(1);
if (parseInt(input, minor))
return true;
if (input.empty()) {
*this = VersionTuple(major, minor);
return false;
}
// If we're not done, parse the micro version, \.[0-9]+
if (input[0] != '.')
return true;
input = input.substr(1);
if (parseInt(input, micro))
return true;
if (input.empty()) {
*this = VersionTuple(major, minor, micro);
return false;
}
// If we're not done, parse the micro version, \.[0-9]+
if (input[0] != '.')
return true;
input = input.substr(1);
if (parseInt(input, build))
return true;
// If we have characters left over, it's an error.
if (!input.empty())
return true;
*this = VersionTuple(major, minor, micro, build);
return false;
}
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