// stringutils.h

/*    Copyright 2010 10gen Inc.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

#pragma once

#include <ctype.h>

#include <string>
#include <vector>

#include <boost/scoped_array.hpp>

#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();

    boost::scoped_array<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(const StringData& s1, const StringData& s2, bool lexOnly);
    int cmp(const StringData& s1, const StringData& s2) const;
    bool operator()(const StringData& s1, const StringData& s2) const;

private:
    bool _lexOnly;
};

// TODO: Sane-ify core string functionality
// For now, this needs to be near the LexNumCmp or else
int versionCmp(const StringData rhs, const StringData lhs);

}  // namespace mongo
