versionlib.h

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/*
 Copyright (C) 2001-2006, William Joseph.
 All Rights Reserved.

 This file is part of GtkRadiant.

 GtkRadiant is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation; either version 2 of the License, or
 (at your option) any later version.

 GtkRadiant is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with GtkRadiant; if not, write to the Free Software
 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#if !defined(INCLUDED_VERSIONLIB_H)
#define INCLUDED_VERSIONLIB_H

#include <cstddef>
#include <string.h>
#include <algorithm>

class Version
{
    public:
        int major;
        int minor;
};

inline bool operator< (const Version& version, const Version& other)
{
    return version.major < other.major || (!(other.major < version.major) && version.minor < other.minor);
}

inline bool version_compatible (const Version& version, const Version& other)
{
    return version.major == other.major // different major-versions are always incompatible
            && !(version.minor < other.minor); // data minor-version is incompatible if greater than code minor-version
}

inline int string_range_parse_unsigned_decimal_integer (const char* first, const char* last)
{
    int result = 0;
    for (; first != last; ++first) {
        result *= 10;
        result += *first - '0';
    }
    return result;
}

inline Version version_parse (const std::string& versionString)
{
    Version version;
    const char* endVersion = versionString.c_str() + versionString.length();

    const char* endMajor = strchr(versionString.c_str(), '.');
    if (endMajor == 0) {
        endMajor = endVersion;

        version.minor = 0;
    } else {
        const char* endMinor = strchr(endMajor + 1, '.');
        if (endMinor == 0) {
            endMinor = endVersion;
        }
        version.minor = string_range_parse_unsigned_decimal_integer(endMajor + 1, endMinor);
    }
    version.major = string_range_parse_unsigned_decimal_integer(versionString.c_str(), endMajor);

    return version;
}

#endif