376 lines
10 KiB
C++
376 lines
10 KiB
C++
/*
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* Copyright © 2012,2017 Google, Inc.
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* Copyright © 2021 Behdad Esfahbod
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Google Author(s): Behdad Esfahbod
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*/
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#ifndef HB_BIT_SET_INVERTIBLE_HH
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#define HB_BIT_SET_INVERTIBLE_HH
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#include "hb.hh"
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#include "hb-bit-set.hh"
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struct hb_bit_set_invertible_t
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{
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hb_bit_set_t s;
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bool inverted = false;
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hb_bit_set_invertible_t () = default;
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hb_bit_set_invertible_t (const hb_bit_set_invertible_t& o) = default;
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hb_bit_set_invertible_t (hb_bit_set_invertible_t&& other) : hb_bit_set_invertible_t () { hb_swap (*this, other); }
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hb_bit_set_invertible_t& operator= (const hb_bit_set_invertible_t& o) = default;
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hb_bit_set_invertible_t& operator= (hb_bit_set_invertible_t&& other) { hb_swap (*this, other); return *this; }
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friend void swap (hb_bit_set_invertible_t &a, hb_bit_set_invertible_t &b)
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{
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if (likely (!a.s.successful || !b.s.successful))
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return;
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hb_swap (a.inverted, b.inverted);
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hb_swap (a.s, b.s);
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}
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void init () { s.init (); inverted = false; }
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void fini () { s.fini (); }
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void err () { s.err (); }
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bool in_error () const { return s.in_error (); }
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explicit operator bool () const { return !is_empty (); }
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void alloc (unsigned sz) { s.alloc (sz); }
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void reset ()
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{
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s.reset ();
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inverted = false;
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}
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void clear ()
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{
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s.clear ();
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if (likely (s.successful))
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inverted = false;
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}
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void invert ()
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{
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if (likely (s.successful))
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inverted = !inverted;
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}
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bool is_empty () const
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{
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hb_codepoint_t v = INVALID;
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next (&v);
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return v == INVALID;
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}
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uint32_t hash () const { return s.hash () ^ (uint32_t) inverted; }
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hb_codepoint_t get_min () const
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{
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hb_codepoint_t v = INVALID;
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next (&v);
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return v;
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}
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hb_codepoint_t get_max () const
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{
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hb_codepoint_t v = INVALID;
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previous (&v);
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return v;
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}
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unsigned int get_population () const
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{ return inverted ? INVALID - s.get_population () : s.get_population (); }
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void add (hb_codepoint_t g) { unlikely (inverted) ? s.del (g) : s.add (g); }
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bool add_range (hb_codepoint_t a, hb_codepoint_t b)
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{ return unlikely (inverted) ? ((void) s.del_range (a, b), true) : s.add_range (a, b); }
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template <typename T>
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void add_array (const T *array, unsigned int count, unsigned int stride=sizeof(T))
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{ inverted ? s.del_array (array, count, stride) : s.add_array (array, count, stride); }
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template <typename T>
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void add_array (const hb_array_t<const T>& arr) { add_array (&arr, arr.len ()); }
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/* Might return false if array looks unsorted.
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* Used for faster rejection of corrupt data. */
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template <typename T>
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bool add_sorted_array (const T *array, unsigned int count, unsigned int stride=sizeof(T))
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{ return inverted ? s.del_sorted_array (array, count, stride) : s.add_sorted_array (array, count, stride); }
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template <typename T>
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bool add_sorted_array (const hb_sorted_array_t<const T>& arr) { return add_sorted_array (&arr, arr.len ()); }
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void del (hb_codepoint_t g) { unlikely (inverted) ? s.add (g) : s.del (g); }
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void del_range (hb_codepoint_t a, hb_codepoint_t b)
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{ unlikely (inverted) ? (void) s.add_range (a, b) : s.del_range (a, b); }
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bool get (hb_codepoint_t g) const { return s.get (g) ^ inverted; }
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/* Has interface. */
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static constexpr bool SENTINEL = false;
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typedef bool value_t;
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value_t operator [] (hb_codepoint_t k) const { return get (k); }
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bool has (hb_codepoint_t k) const { return (*this)[k] != SENTINEL; }
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/* Predicate. */
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bool operator () (hb_codepoint_t k) const { return has (k); }
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/* Sink interface. */
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hb_bit_set_invertible_t& operator << (hb_codepoint_t v)
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{ add (v); return *this; }
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hb_bit_set_invertible_t& operator << (const hb_pair_t<hb_codepoint_t, hb_codepoint_t>& range)
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{ add_range (range.first, range.second); return *this; }
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bool intersects (hb_codepoint_t first, hb_codepoint_t last) const
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{
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hb_codepoint_t c = first - 1;
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return next (&c) && c <= last;
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}
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void set (const hb_bit_set_invertible_t &other)
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{
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s.set (other.s);
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if (likely (s.successful))
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inverted = other.inverted;
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}
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bool is_equal (const hb_bit_set_invertible_t &other) const
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{
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if (likely (inverted == other.inverted))
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return s.is_equal (other.s);
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else
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{
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/* TODO Add iter_ranges() and use here. */
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auto it1 = iter ();
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auto it2 = other.iter ();
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return hb_all (+ hb_zip (it1, it2)
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| hb_map ([](hb_pair_t<hb_codepoint_t, hb_codepoint_t> _) { return _.first == _.second; }));
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}
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}
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bool is_subset (const hb_bit_set_invertible_t &larger_set) const
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{
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if (unlikely (inverted != larger_set.inverted))
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return hb_all (hb_iter (s) | hb_map (larger_set.s));
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else
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return unlikely (inverted) ? larger_set.s.is_subset (s) : s.is_subset (larger_set.s);
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}
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protected:
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template <typename Op>
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void process (const Op& op, const hb_bit_set_invertible_t &other)
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{ s.process (op, other.s); }
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public:
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void union_ (const hb_bit_set_invertible_t &other)
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{
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if (likely (inverted == other.inverted))
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{
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if (unlikely (inverted))
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process (hb_bitwise_and, other);
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else
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process (hb_bitwise_or, other); /* Main branch. */
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}
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else
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{
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if (unlikely (inverted))
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process (hb_bitwise_gt, other);
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else
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process (hb_bitwise_lt, other);
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}
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if (likely (s.successful))
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inverted = inverted || other.inverted;
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}
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void intersect (const hb_bit_set_invertible_t &other)
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{
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if (likely (inverted == other.inverted))
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{
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if (unlikely (inverted))
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process (hb_bitwise_or, other);
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else
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process (hb_bitwise_and, other); /* Main branch. */
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}
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else
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{
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if (unlikely (inverted))
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process (hb_bitwise_lt, other);
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else
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process (hb_bitwise_gt, other);
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}
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if (likely (s.successful))
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inverted = inverted && other.inverted;
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}
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void subtract (const hb_bit_set_invertible_t &other)
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{
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if (likely (inverted == other.inverted))
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{
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if (unlikely (inverted))
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process (hb_bitwise_lt, other);
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else
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process (hb_bitwise_gt, other); /* Main branch. */
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}
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else
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{
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if (unlikely (inverted))
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process (hb_bitwise_or, other);
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else
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process (hb_bitwise_and, other);
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}
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if (likely (s.successful))
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inverted = inverted && !other.inverted;
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}
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void symmetric_difference (const hb_bit_set_invertible_t &other)
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{
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process (hb_bitwise_xor, other);
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if (likely (s.successful))
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inverted = inverted ^ other.inverted;
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}
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bool next (hb_codepoint_t *codepoint) const
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{
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if (likely (!inverted))
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return s.next (codepoint);
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auto old = *codepoint;
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if (unlikely (old + 1 == INVALID))
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{
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*codepoint = INVALID;
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return false;
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}
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auto v = old;
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s.next (&v);
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if (old + 1 < v)
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{
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*codepoint = old + 1;
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return true;
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}
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v = old;
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s.next_range (&old, &v);
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*codepoint = v + 1;
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return *codepoint != INVALID;
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}
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bool previous (hb_codepoint_t *codepoint) const
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{
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if (likely (!inverted))
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return s.previous (codepoint);
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auto old = *codepoint;
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if (unlikely (old - 1 == INVALID))
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{
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*codepoint = INVALID;
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return false;
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}
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auto v = old;
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s.previous (&v);
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if (old - 1 > v || v == INVALID)
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{
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*codepoint = old - 1;
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return true;
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}
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v = old;
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s.previous_range (&v, &old);
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*codepoint = v - 1;
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return *codepoint != INVALID;
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}
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bool next_range (hb_codepoint_t *first, hb_codepoint_t *last) const
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{
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if (likely (!inverted))
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return s.next_range (first, last);
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if (!next (last))
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{
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*last = *first = INVALID;
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return false;
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}
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*first = *last;
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s.next (last);
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--*last;
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return true;
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}
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bool previous_range (hb_codepoint_t *first, hb_codepoint_t *last) const
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{
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if (likely (!inverted))
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return s.previous_range (first, last);
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if (!previous (first))
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{
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*last = *first = INVALID;
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return false;
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}
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*last = *first;
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s.previous (first);
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++*first;
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return true;
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}
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unsigned int next_many (hb_codepoint_t codepoint,
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hb_codepoint_t *out,
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unsigned int size) const
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{
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return inverted ? s.next_many_inverted (codepoint, out, size)
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: s.next_many (codepoint, out, size);
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}
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static constexpr hb_codepoint_t INVALID = hb_bit_set_t::INVALID;
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/*
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* Iterator implementation.
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*/
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struct iter_t : hb_iter_with_fallback_t<iter_t, hb_codepoint_t>
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{
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static constexpr bool is_sorted_iterator = true;
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iter_t (const hb_bit_set_invertible_t &s_ = Null (hb_bit_set_invertible_t),
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bool init = true) : s (&s_), v (INVALID), l(0)
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{
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if (init)
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{
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l = s->get_population () + 1;
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__next__ ();
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}
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}
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typedef hb_codepoint_t __item_t__;
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hb_codepoint_t __item__ () const { return v; }
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bool __more__ () const { return v != INVALID; }
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void __next__ () { s->next (&v); if (l) l--; }
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void __prev__ () { s->previous (&v); }
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unsigned __len__ () const { return l; }
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iter_t end () const { return iter_t (*s, false); }
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bool operator != (const iter_t& o) const
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{ return s != o.s || v != o.v; }
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protected:
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const hb_bit_set_invertible_t *s;
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hb_codepoint_t v;
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unsigned l;
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};
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iter_t iter () const { return iter_t (*this); }
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operator iter_t () const { return iter (); }
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};
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#endif /* HB_BIT_SET_INVERTIBLE_HH */
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