/*
 * Copyright (C) 2006-2007 Toni Corvera
 *
 * This program 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.
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

// $Id: str_utils.cc 726 2007-05-20 14:27:08Z  $

#include "str_utils.h"

#include <algorithm> // std::transform
#include <cctype>    // std::toupper
#include <cassert>

#include <iostream>

namespace net_outlyer {

namespace str_utils {

using std::string;
using std::transform;
using std::vector;

inline static
string copy_transform(const string & s, int(*callback)(int)) {
    string cp(s);
    transform(s.begin(), s.end(), cp.begin(), callback);
    return cp;
}

const string to_upper(const string & s) {
    return copy_transform(s, std::toupper);
}

const string to_lower(const string & s) {
    return copy_transform(s, std::tolower);
}

const string to_hex(int n) {
    return to_string<int>(n, std::hex);
}

// FIXME: isn't this standardly defined somewhere?
#define MAX(a,b)    ( (a)>(b) ? (a) : (b) )

const string pad(const string & s, size_t pad_to, const string & pad, const pad_direction & p) {
    if (s.length() >= pad_to) return s;

    string cp;
    cp.reserve(pad_to);

    size_t diff = pad_to - s.length();

    assert( diff > 0 );

    switch (p) {
        case PAD_RIGHT:
        case PAD_LEFT:
        {
            string padding(pad);
            while (padding.length() < diff) {
                padding.append(pad);
            }

            if (PAD_RIGHT == p) {
                cp = s + padding.substr(0, diff);
            }
            else {
                assert( PAD_LEFT == p );
                cp = padding.substr(0, diff) + s;
            }
        }
        break;
        case PAD_BOTH:
        {
            size_t llen = diff / 2;
            size_t rlen = diff - llen;

            string padding(pad);
            while (padding.length() < MAX(llen, rlen)) {
                padding.append(pad);
            }

            cp = padding.substr(0, llen) + s + padding.substr(0, rlen);
        }
        break;
        default:
            assert( false );
    } // switch

    return cp;

} // string_pad

bool ends_in(const string & s, const string & end) {
    assert( end.length() > 0 );

    if (end.length() > s.length()) return false;

    return s.substr(s.length() - end.length()) == end;
}

} // namespace str_utils

} // namespace net_outlyer

/* vim:set ts=4 et ai: */