strfnd.h

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/*
Minetest
Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
 
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
 
You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
 
#pragma once
 
#include <string>
 
template <typename T>
class BasicStrfnd {
    typedef std::basic_string<T> String;
    String str;
    size_t pos;
public:
    BasicStrfnd(const String &s) : str(s), pos(0) {}
    void start(const String &s) { str = s; pos = 0; }
    size_t where() { return pos; }
    void to(size_t i) { pos = i; }
    bool at_end() { return pos >= str.size(); }
    String what() { return str; }
 
    String next(const String &sep)
    {
        if (pos >= str.size())
            return String();
 
        size_t n;
        if (sep.empty() || (n = str.find(sep, pos)) == String::npos) {
            n = str.size();
        }
        String ret = str.substr(pos, n - pos);
        pos = n + sep.size();
        return ret;
    }
 
    // Returns substr up to the next occurence of sep that isn't escaped with esc ('\\')
    String next_esc(const String &sep, T esc=static_cast<T>('\\'))
    {
        if (pos >= str.size())
            return String();
 
        size_t n, old_p = pos;
        do {
            if (sep.empty() || (n = str.find(sep, pos)) == String::npos) {
                pos = n = str.size();
                break;
            }
            pos = n + sep.length();
        } while (n > 0 && str[n - 1] == esc);
 
        return str.substr(old_p, n - old_p);
    }
 
    void skip_over(const String &chars)
    {
        size_t p = str.find_first_not_of(chars, pos);
        if (p != String::npos)
            pos = p;
    }
};
 
typedef BasicStrfnd<char> Strfnd;
typedef BasicStrfnd<wchar_t> WStrfnd;