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/*

 * Copyright © 2012,2017  Google, Inc.

 * Copyright © 2021 Behdad Esfahbod

 *  This is part of HarfBuzz, a text shaping library.

 * Permission is hereby granted, without written agreement and without

 * license or royalty fees, to use, copy, modify, and distribute this

 * software and its documentation for any purpose, provided that the

 * above copyright notice and the following two paragraphs appear in

 * all copies of this software.

 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR

 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES

 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN

 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH

 * DAMAGE.

 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,

 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND

 * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS

 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO

 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.

 * Google Author(s): Behdad Esfahbod

*/

#ifndef HB_SET_HH

#define HB_SET_HH

#include "hb.hh"

#include "hb-bit-set-invertible.hh"

template <typename impl_t>

struct hb_sparseset_t

  static constexpr bool realloc_move = true;

  hb_object_header_t header;

  impl_t s;

  hb_sparseset_t () { init (); }

  ~hb_sparseset_t () { fini (); }

  hb_sparseset_t (const hb_sparseset_t& other) : hb_sparseset_t () { set (other); }

  hb_sparseset_t (hb_sparseset_t&& other)  noexcept : hb_sparseset_t () { s = std::move (other.s); }

  hb_sparseset_t& operator = (const hb_sparseset_t& other) { set (other); return *this; }

  hb_sparseset_t& operator = (hb_sparseset_t&& other)  noexcept { s = std::move (other.s); return *this; }

  friend void swap (hb_sparseset_t& a, hb_sparseset_t& b)  noexcept { hb_swap (a.s, b.s); }

  hb_sparseset_t (std::initializer_list<hb_codepoint_t> lst) : hb_sparseset_t ()

    for (auto&& item : lst)

      add (item);

  template <typename Iterable,

           hb_requires (hb_is_iterable (Iterable))>

  hb_sparseset_t (const Iterable &o) : hb_sparseset_t ()

    hb_copy (o, *this);

  void init ()

    hb_object_init (this);

    s.init ();

  void fini ()

    hb_object_fini (this);

    s.fini ();

  explicit operator bool () const { return !is_empty (); }

  void err () { s.err (); }

  bool in_error () const { return s.in_error (); }

  void alloc (unsigned sz) { s.alloc (sz); }

  void reset () { s.reset (); }

  void clear () { s.clear (); }

  void invert () { s.invert (); }

  bool is_inverted () const { return s.is_inverted (); }

  bool is_empty () const { return s.is_empty (); }

  uint32_t hash () const { return s.hash (); }

  void add (hb_codepoint_t g) { s.add (g); }

  bool add_range (hb_codepoint_t first, hb_codepoint_t last) { return s.add_range (first, last); }

  template <typename T>

  void add_array (const T *array, unsigned int count, unsigned int stride=sizeof(T))

  { s.add_array (array, count, stride); }

  template <typename T>

  void add_array (const hb_array_t<const T>& arr) { add_array (&arr, arr.len ()); }

  /* Might return false if array looks unsorted.

   * Used for faster rejection of corrupt data. */

  template <typename T>

  bool add_sorted_array (const T *array, unsigned int count, unsigned int stride=sizeof(T))

  { return s.add_sorted_array (array, count, stride); }

  template <typename T>

  bool add_sorted_array (const hb_sorted_array_t<const T>& arr) { return add_sorted_array (&arr, arr.len ()); }

  void del (hb_codepoint_t g) { s.del (g); }

  void del_range (hb_codepoint_t a, hb_codepoint_t b) { s.del_range (a, b); }

  bool get (hb_codepoint_t g) const { return s.get (g); }

  /* Has interface. */

  bool operator [] (hb_codepoint_t k) const { return get (k); }

  bool has (hb_codepoint_t k) const { return (*this)[k]; }

  /* Predicate. */

  bool operator () (hb_codepoint_t k) const { return has (k); }

  /* Sink interface. */

  hb_sparseset_t& operator << (hb_codepoint_t v)

  { add (v); return *this; }

  hb_sparseset_t& operator << (const hb_codepoint_pair_t& range)

  { add_range (range.first, range.second); return *this; }

  bool intersects (hb_codepoint_t first, hb_codepoint_t last) const

  { return s.intersects (first, last); }

  void set (const hb_sparseset_t &other) { s.set (other.s); }

  bool is_equal (const hb_sparseset_t &other) const { return s.is_equal (other.s); }

  bool operator == (const hb_set_t &other) const { return is_equal (other); }

  bool operator != (const hb_set_t &other) const { return !is_equal (other); }

  bool is_subset (const hb_sparseset_t &larger_set) const { return s.is_subset (larger_set.s); }

  void union_ (const hb_sparseset_t &other) { s.union_ (other.s); }

  void intersect (const hb_sparseset_t &other) { s.intersect (other.s); }

  void subtract (const hb_sparseset_t &other) { s.subtract (other.s); }

  void symmetric_difference (const hb_sparseset_t &other) { s.symmetric_difference (other.s); }

  bool next (hb_codepoint_t *codepoint) const { return s.next (codepoint); }

  bool previous (hb_codepoint_t *codepoint) const { return s.previous (codepoint); }

  bool next_range (hb_codepoint_t *first, hb_codepoint_t *last) const

  { return s.next_range (first, last); }

  bool previous_range (hb_codepoint_t *first, hb_codepoint_t *last) const

  { return s.previous_range (first, last); }

  unsigned int next_many (hb_codepoint_t codepoint, hb_codepoint_t *out, unsigned int size) const

  { return s.next_many (codepoint, out, size); }

  unsigned int get_population () const { return s.get_population (); }

  hb_codepoint_t get_min () const { return s.get_min (); }

  hb_codepoint_t get_max () const { return s.get_max (); }

  static constexpr hb_codepoint_t INVALID = impl_t::INVALID;

/*

   * Iterator implementation.

*/

  using iter_t = typename impl_t::iter_t;

  iter_t iter () const { return iter_t (this->s); }

  operator iter_t () const { return iter (); }

};

struct hb_set_t : hb_sparseset_t<hb_bit_set_invertible_t>

  using sparseset = hb_sparseset_t<hb_bit_set_invertible_t>;

  ~hb_set_t () = default;

  hb_set_t () : sparseset () {};

  hb_set_t (const hb_set_t &o) : sparseset ((sparseset &) o) {};

  hb_set_t (hb_set_t&& o)  noexcept : sparseset (std::move ((sparseset &) o)) {}

  hb_set_t& operator = (const hb_set_t&) = default;

  hb_set_t& operator = (hb_set_t&&) = default;

  hb_set_t (std::initializer_list<hb_codepoint_t> lst) : sparseset (lst) {}

  template <typename Iterable,

	    hb_requires (hb_is_iterable (Iterable))>

  hb_set_t (const Iterable &o) : sparseset (o) {}

  hb_set_t& operator << (hb_codepoint_t v)

  { sparseset::operator<< (v); return *this; }

  hb_set_t& operator << (const hb_codepoint_pair_t& range)

  { sparseset::operator<< (range); return *this; }

};

static_assert (hb_set_t::INVALID == HB_SET_VALUE_INVALID, "");

#endif /* HB_SET_HH */