// stringutils.h

/*    Copyright 2010 10gen Inc.
 *
 *    This program is free software: you can redistribute it and/or  modify
 *    it under the terms of the GNU Affero General Public License, version 3,
 *    as published by the Free Software Foundation.
 *
 *    This program 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 Affero General Public License for more details.
 *
 *    You should have received a copy of the GNU Affero General Public License
 *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *    As a special exception, the copyright holders give permission to link the
 *    code of portions of this program with the OpenSSL library under certain
 *    conditions as described in each individual source file and distribute
 *    linked combinations including the program with the OpenSSL library. You
 *    must comply with the GNU Affero General Public License in all respects
 *    for all of the code used other than as permitted herein. If you modify
 *    file(s) with this exception, you may extend this exception to your
 *    version of the file(s), but you are not obligated to do so. If you do not
 *    wish to do so, delete this exception statement from your version. If you
 *    delete this exception statement from all source files in the program,
 *    then also delete it in the license file.
 */

#pragma once

#include <ctype.h>

#include <memory>
#include <string>
#include <vector>


#include "mongo/base/string_data.h"

namespace mongo {

    // see also mongoutils/str.h - perhaps move these there?
    // see also text.h

    void splitStringDelim( const std::string& str , std::vector<std::string>* res , char delim );

    void joinStringDelim( const std::vector<std::string>& strs , std::string* res , char delim );

    inline std::string tolowerString( StringData input ) {
        std::string::size_type sz = input.size();

        std::unique_ptr<char[]> line(new char[sz+1]);
        char * copy = line.get();

        for ( std::string::size_type i=0; i<sz; i++ ) {
            char c = input[i];
            copy[i] = (char)tolower( (int)c );
        }
        copy[sz] = 0;
        return copy;
    }

    /** Functor for combining lexical and numeric comparisons. */
    class LexNumCmp {
    public:
        /** @param lexOnly - compare all characters lexically, including digits. */
        LexNumCmp( bool lexOnly );
        /**
         * Non numeric characters are compared lexicographically; numeric substrings
         * are compared numerically; dots separate ordered comparable subunits.
         * For convenience, character 255 is greater than anything else.
         * @param lexOnly - compare all characters lexically, including digits.
         */
        static int cmp( StringData s1, StringData s2, bool lexOnly );
        int cmp( StringData s1, StringData s2 ) const;
        bool operator()( StringData s1, StringData s2 ) const;
    private:
        bool _lexOnly;
    };
    
    // TODO: Sane-ify core std::string functionality
    // For now, this needs to be near the LexNumCmp or else
    int versionCmp(const StringData rhs, const StringData lhs);

} // namespace mongo