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+#ifndef TMWA_STRINGS_BASE_HPP
+#define TMWA_STRINGS_BASE_HPP
+// strings/base.cls.hpp - CRTP base for string implementations.
+//
+// Copyright © 2013 Ben Longbons <b.r.longbons@gmail.com>
+//
+// This file is part of The Mana World (Athena server)
+//
+// 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 3 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, see <http://www.gnu.org/licenses/>.
+
+#include "fwd.hpp"
+#include "pair.hpp"
+
+#include <iterator>
+
+// It is a common mistake to assume that one string class for everything.
+// Because C++ and TMWA have a C legacy, there are a few more here
+// than would probably be necessary in an ideal language.
+namespace strings
+{
+ // simple pointer-wrapping iterator that can be used to get distinct
+ // types for different containers.
+ template<class Tag>
+ class _iterator
+ {
+ typedef _iterator X;
+
+ const char *_ptr;
+ public:
+ typedef ptrdiff_t difference_type;
+ typedef char value_type;
+ typedef const char *pointer;
+ typedef const char& reference;
+ typedef std::random_access_iterator_tag iterator_category;
+
+ _iterator(const char *p=nullptr) : _ptr(p) {}
+
+ // iterator
+ reference operator *() const { return *_ptr; }
+ X& operator ++() { ++_ptr; return *this; }
+ // equality comparable
+ friend bool operator == (X l, X r) { return l._ptr == r._ptr; }
+ // input iterator
+ friend bool operator != (X l, X r) { return !(l == r); }
+ pointer operator->() const { return _ptr; }
+ X operator++ (int) { X out = *this; ++*this; return out; }
+ // forward iterator is mostly semantical, and the ctor is above
+ // bidirectional iterator
+ X& operator --() { --_ptr; return *this; }
+ X operator-- (int) { X out = *this; --*this; return out; }
+ // random access iterator
+ X& operator += (difference_type n) { _ptr += n; return *this; }
+ friend X operator + (X a, difference_type n) { return a += n; }
+ friend X operator + (difference_type n, X a) { return a += n; }
+ X& operator -= (difference_type n) { _ptr -= n; return *this; }
+ friend X operator - (X a, difference_type n) { return a -= n; }
+ friend difference_type operator - (X b, X a) { return b._ptr - a._ptr; }
+ reference operator[](difference_type n) const { return _ptr[n]; }
+ friend bool operator < (X a, X b) { return a._ptr < b._ptr; }
+ friend bool operator > (X a, X b) { return b < a; }
+ friend bool operator >= (X a, X b) { return !(a < b); }
+ friend bool operator <= (X a, X b) { return !(a > b); }
+ };
+
+ /// A helper class that implements all the interesting stuff that can
+ /// be done on any constant string, in terms of .begin() and .end().
+ template<class T, class O, class P>
+ class _crtp_string
+ {
+ typedef typename P::TailSlice Z;
+ typedef typename P::FullSlice X;
+ public:
+ // this will have to be changed if MString decides to join in.
+ typedef _iterator<T> iterator;
+ typedef std::reverse_iterator<iterator> reverse_iterator;
+ private:
+ const T& _ref() const;
+ iterator begin() const;
+ iterator end() const;
+ const FString *base() const;
+ public:
+ size_t size() const;
+ reverse_iterator rbegin() const;
+ reverse_iterator rend() const;
+ explicit
+ operator bool() const;
+ bool operator !() const;
+ operator P() const;
+
+ // the existence of this has led to bugs
+ // it's not really sane from a unicode perspective anyway ...
+ // prefer startswith or extract
+ __attribute__((deprecated))
+ char operator[](size_t i) const;
+ char front() const;
+ char back() const;
+ const char *data();
+
+ Z xslice_t(size_t o) const;
+ X xslice_h(size_t o) const;
+ Z xrslice_t(size_t no) const;
+ X xrslice_h(size_t no) const;
+ Z xislice_t(iterator it) const;
+ X xislice_h(iterator it) const;
+ X xlslice(size_t o, size_t l) const;
+ X xpslice(size_t b, size_t e) const;
+ X xislice(iterator b, iterator e) const;
+ Z lstrip() const;
+ X rstrip() const;
+ X strip() const;
+
+ bool startswith(XPair x) const;
+ bool endswith(XPair x) const;
+ bool startswith(char c) const;
+ bool endswith(char c) const;
+
+ bool contains(char c) const;
+ bool contains_seq(XPair s) const;
+ bool contains_any(XPair s) const;
+
+ bool has_print() const;
+ bool is_print() const;
+ __attribute__((deprecated))
+ O to_print() const;
+
+ bool is_graph() const;
+ bool has_graph() const;
+
+ bool has_lower() const;
+ bool is_lower() const;
+ O to_lower() const;
+
+ bool has_upper() const;
+ bool is_upper() const;
+ O to_upper() const;
+
+ bool has_alpha() const; // equivalent to has_lower || has_upper
+ bool is_alpha() const; // NOT equivalent to is_lower || is_upper
+
+ bool has_digit2() const;
+ bool is_digit2() const;
+ bool has_digit8() const;
+ bool is_digit8() const;
+ bool has_digit10() const;
+ bool is_digit10() const;
+ bool has_digit16() const;
+ bool is_digit16() const;
+
+ bool has_alnum() const; // equivalent to has_alpha || has_digit10
+ bool is_alnum() const; // NOT equivalent to is_alpha || is_digit10
+ };
+
+ template<class L, class R>
+ class string_comparison_allowed
+ {
+ constexpr static bool l_is_vstring_exact = std::is_same<VString<sizeof(L) - 1>, L>::value;
+ constexpr static bool l_is_vstring_approx = std::is_base_of<VString<sizeof(L) - 1>, L>::value;
+ constexpr static bool r_is_vstring_exact = std::is_same<VString<sizeof(R) - 1>, R>::value;
+ constexpr static bool r_is_vstring_approx = std::is_base_of<VString<sizeof(R) - 1>, R>::value;
+
+ constexpr static bool l_is_restricted = l_is_vstring_approx && !l_is_vstring_exact;
+ constexpr static bool r_is_restricted = r_is_vstring_approx && !r_is_vstring_exact;
+ public:
+ constexpr static bool value = std::is_same<L, R>::value || (!l_is_restricted && !r_is_restricted);
+ };
+
+ // not really intended for public use
+ int pair_compare(XPair l, XPair r);
+
+ template<class L, class R, typename=typename std::enable_if<string_comparison_allowed<L, R>::value>::type>
+ auto operator == (const L& l, const R& r) -> decltype((pair_compare(l, r), true));
+ template<class L, class R, typename=typename std::enable_if<string_comparison_allowed<L, R>::value>::type>
+ auto operator != (const L& l, const R& r) -> decltype((pair_compare(l, r), true));
+ template<class L, class R, typename=typename std::enable_if<string_comparison_allowed<L, R>::value>::type>
+ auto operator < (const L& l, const R& r) -> decltype((pair_compare(l, r), true));
+ template<class L, class R, typename=typename std::enable_if<string_comparison_allowed<L, R>::value>::type>
+ auto operator <= (const L& l, const R& r) -> decltype((pair_compare(l, r), true));
+ template<class L, class R, typename=typename std::enable_if<string_comparison_allowed<L, R>::value>::type>
+ auto operator > (const L& l, const R& r) -> decltype((pair_compare(l, r), true));
+ template<class L, class R, typename=typename std::enable_if<string_comparison_allowed<L, R>::value>::type>
+ auto operator >= (const L& l, const R& r) -> decltype((pair_compare(l, r), true));
+
+ // sadness
+ typedef MString MS;
+ typedef FString FS;
+ typedef TString TS;
+ typedef SString SS;
+ typedef ZString ZS;
+ typedef XString XS;
+} // namespace strings
+
+#include "base.tcc"
+
+#endif // TMWA_STRINGS_BASE_HPP
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