409 lines
12 KiB
C++
409 lines
12 KiB
C++
/*
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* Copyright © 2018 Google, Inc.
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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_ARRAY_HH
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#define HB_ARRAY_HH
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#include "hb.hh"
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#include "hb-algs.hh"
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#include "hb-iter.hh"
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#include "hb-null.hh"
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template <typename Type>
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struct hb_sorted_array_t;
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template <typename Type>
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struct hb_array_t : hb_iter_with_fallback_t<hb_array_t<Type>, Type&>
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{
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/*
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* Constructors.
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*/
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hb_array_t () : arrayZ (nullptr), length (0), backwards_length (0) {}
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hb_array_t (Type *array_, unsigned int length_) : arrayZ (array_), length (length_), backwards_length (0) {}
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template <unsigned int length_>
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hb_array_t (Type (&array_)[length_]) : arrayZ (array_), length (length_), backwards_length (0) {}
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template <typename U,
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hb_enable_if (hb_is_cr_convertible(U, Type))>
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hb_array_t (const hb_array_t<U> &o) :
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hb_iter_with_fallback_t<hb_array_t, Type&> (),
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arrayZ (o.arrayZ), length (o.length), backwards_length (o.backwards_length) {}
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template <typename U,
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hb_enable_if (hb_is_cr_convertible(U, Type))>
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hb_array_t& operator = (const hb_array_t<U> &o)
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{ arrayZ = o.arrayZ; length = o.length; backwards_length = o.backwards_length; return *this; }
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/*
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* Iterator implementation.
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*/
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typedef Type& __item_t__;
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static constexpr bool is_random_access_iterator = true;
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Type& __item_at__ (unsigned i) const
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{
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if (unlikely (i >= length)) return CrapOrNull (Type);
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return arrayZ[i];
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}
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void __forward__ (unsigned n)
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{
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if (unlikely (n > length))
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n = length;
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length -= n;
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backwards_length += n;
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arrayZ += n;
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}
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void __rewind__ (unsigned n)
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{
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if (unlikely (n > backwards_length))
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n = backwards_length;
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length += n;
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backwards_length -= n;
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arrayZ -= n;
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}
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unsigned __len__ () const { return length; }
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/* Ouch. The operator== compares the contents of the array. For range-based for loops,
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* it's best if we can just compare arrayZ, though comparing contents is still fast,
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* but also would require that Type has operator==. As such, we optimize this operator
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* for range-based for loop and just compare arrayZ. No need to compare length, as we
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* assume we're only compared to .end(). */
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bool operator != (const hb_array_t& o) const
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{ return arrayZ != o.arrayZ; }
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/* Extra operators.
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*/
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Type * operator & () const { return arrayZ; }
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operator hb_array_t<const Type> () { return hb_array_t<const Type> (arrayZ, length); }
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template <typename T> operator T * () const { return arrayZ; }
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HB_INTERNAL bool operator == (const hb_array_t &o) const;
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uint32_t hash () const {
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uint32_t current = 0;
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for (unsigned int i = 0; i < this->length; i++) {
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current = current * 31 + hb_hash (this->arrayZ[i]);
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}
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return current;
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}
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/*
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* Compare, Sort, and Search.
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*/
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/* Note: our compare is NOT lexicographic; it also does NOT call Type::cmp. */
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int cmp (const hb_array_t &a) const
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{
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if (length != a.length)
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return (int) a.length - (int) length;
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return hb_memcmp (a.arrayZ, arrayZ, get_size ());
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}
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HB_INTERNAL static int cmp (const void *pa, const void *pb)
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{
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hb_array_t *a = (hb_array_t *) pa;
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hb_array_t *b = (hb_array_t *) pb;
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return b->cmp (*a);
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}
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template <typename T>
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Type *lsearch (const T &x, Type *not_found = nullptr)
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{
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unsigned i;
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return lfind (x, &i) ? &this->arrayZ[i] : not_found;
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}
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template <typename T>
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const Type *lsearch (const T &x, const Type *not_found = nullptr) const
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{
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unsigned i;
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return lfind (x, &i) ? &this->arrayZ[i] : not_found;
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}
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template <typename T>
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bool lfind (const T &x, unsigned *pos = nullptr) const
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{
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for (unsigned i = 0; i < length; ++i)
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if (!this->arrayZ[i].cmp (x))
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{
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if (pos)
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*pos = i;
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return true;
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}
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return false;
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}
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hb_sorted_array_t<Type> qsort (int (*cmp_)(const void*, const void*))
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{
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if (likely (length))
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hb_qsort (arrayZ, length, this->get_item_size (), cmp_);
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return hb_sorted_array_t<Type> (*this);
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}
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hb_sorted_array_t<Type> qsort ()
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{
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if (likely (length))
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hb_qsort (arrayZ, length, this->get_item_size (), Type::cmp);
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return hb_sorted_array_t<Type> (*this);
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}
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void qsort (unsigned int start, unsigned int end)
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{
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end = hb_min (end, length);
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assert (start <= end);
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if (likely (start < end))
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hb_qsort (arrayZ + start, end - start, this->get_item_size (), Type::cmp);
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}
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/*
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* Other methods.
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*/
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unsigned int get_size () const { return length * this->get_item_size (); }
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/*
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* Reverse the order of items in this array in the range [start, end).
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*/
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void reverse (unsigned start = 0, unsigned end = -1)
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{
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start = hb_min (start, length);
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end = hb_min (end, length);
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if (end < start + 2)
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return;
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for (unsigned lhs = start, rhs = end - 1; lhs < rhs; lhs++, rhs--) {
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Type temp = arrayZ[rhs];
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arrayZ[rhs] = arrayZ[lhs];
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arrayZ[lhs] = temp;
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}
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}
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hb_array_t sub_array (unsigned int start_offset = 0, unsigned int *seg_count = nullptr /* IN/OUT */) const
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{
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if (!start_offset && !seg_count)
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return *this;
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unsigned int count = length;
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if (unlikely (start_offset > count))
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count = 0;
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else
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count -= start_offset;
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if (seg_count)
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count = *seg_count = hb_min (count, *seg_count);
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return hb_array_t (arrayZ + start_offset, count);
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}
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hb_array_t sub_array (unsigned int start_offset, unsigned int seg_count) const
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{ return sub_array (start_offset, &seg_count); }
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hb_array_t truncate (unsigned length) const { return sub_array (0, length); }
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template <typename T,
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unsigned P = sizeof (Type),
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hb_enable_if (P == 1)>
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const T *as () const
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{ return length < hb_null_size (T) ? &Null (T) : reinterpret_cast<const T *> (arrayZ); }
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template <typename T,
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unsigned P = sizeof (Type),
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hb_enable_if (P == 1)>
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bool check_range (const T *p, unsigned int size = T::static_size) const
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{
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return arrayZ <= ((const char *) p)
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&& ((const char *) p) <= arrayZ + length
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&& (unsigned int) (arrayZ + length - (const char *) p) >= size;
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}
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/* Only call if you allocated the underlying array using malloc() or similar. */
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void free ()
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{ ::free ((void *) arrayZ); arrayZ = nullptr; length = 0; }
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template <typename hb_serialize_context_t>
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hb_array_t copy (hb_serialize_context_t *c) const
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{
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TRACE_SERIALIZE (this);
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auto* out = c->start_embed (arrayZ);
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if (unlikely (!c->extend_size (out, get_size ()))) return_trace (hb_array_t ());
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for (unsigned i = 0; i < length; i++)
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out[i] = arrayZ[i]; /* TODO: add version that calls c->copy() */
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return_trace (hb_array_t (out, length));
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}
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template <typename hb_sanitize_context_t>
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bool sanitize (hb_sanitize_context_t *c) const
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{ return c->check_array (arrayZ, length); }
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/*
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* Members
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*/
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public:
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Type *arrayZ;
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unsigned int length;
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unsigned int backwards_length;
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};
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template <typename T> inline hb_array_t<T>
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hb_array (T *array, unsigned int length)
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{ return hb_array_t<T> (array, length); }
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template <typename T, unsigned int length_> inline hb_array_t<T>
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hb_array (T (&array_)[length_])
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{ return hb_array_t<T> (array_); }
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enum hb_bfind_not_found_t
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{
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HB_BFIND_NOT_FOUND_DONT_STORE,
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HB_BFIND_NOT_FOUND_STORE,
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HB_BFIND_NOT_FOUND_STORE_CLOSEST,
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};
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template <typename Type>
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struct hb_sorted_array_t :
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hb_iter_t<hb_sorted_array_t<Type>, Type&>,
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hb_array_t<Type>
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{
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typedef hb_iter_t<hb_sorted_array_t, Type&> iter_base_t;
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HB_ITER_USING (iter_base_t);
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static constexpr bool is_random_access_iterator = true;
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static constexpr bool is_sorted_iterator = true;
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hb_sorted_array_t () : hb_array_t<Type> () {}
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hb_sorted_array_t (Type *array_, unsigned int length_) : hb_array_t<Type> (array_, length_) {}
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template <unsigned int length_>
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hb_sorted_array_t (Type (&array_)[length_]) : hb_array_t<Type> (array_) {}
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template <typename U,
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hb_enable_if (hb_is_cr_convertible(U, Type))>
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hb_sorted_array_t (const hb_array_t<U> &o) :
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hb_iter_t<hb_sorted_array_t, Type&> (),
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hb_array_t<Type> (o) {}
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template <typename U,
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hb_enable_if (hb_is_cr_convertible(U, Type))>
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hb_sorted_array_t& operator = (const hb_array_t<U> &o)
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{ hb_array_t<Type> (*this) = o; return *this; }
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/* Iterator implementation. */
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bool operator != (const hb_sorted_array_t& o) const
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{ return this->arrayZ != o.arrayZ || this->length != o.length; }
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hb_sorted_array_t sub_array (unsigned int start_offset, unsigned int *seg_count /* IN/OUT */) const
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{ return hb_sorted_array_t (((const hb_array_t<Type> *) (this))->sub_array (start_offset, seg_count)); }
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hb_sorted_array_t sub_array (unsigned int start_offset, unsigned int seg_count) const
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{ return sub_array (start_offset, &seg_count); }
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hb_sorted_array_t truncate (unsigned length) const { return sub_array (0, length); }
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template <typename T>
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Type *bsearch (const T &x, Type *not_found = nullptr)
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{
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unsigned int i;
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return bfind (x, &i) ? &this->arrayZ[i] : not_found;
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}
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template <typename T>
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const Type *bsearch (const T &x, const Type *not_found = nullptr) const
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{
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unsigned int i;
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return bfind (x, &i) ? &this->arrayZ[i] : not_found;
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}
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template <typename T>
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bool bfind (const T &x, unsigned int *i = nullptr,
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hb_bfind_not_found_t not_found = HB_BFIND_NOT_FOUND_DONT_STORE,
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unsigned int to_store = (unsigned int) -1) const
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{
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unsigned pos;
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if (bsearch_impl (x, &pos))
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{
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if (i)
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*i = pos;
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return true;
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}
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if (i)
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{
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switch (not_found)
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{
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case HB_BFIND_NOT_FOUND_DONT_STORE:
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break;
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case HB_BFIND_NOT_FOUND_STORE:
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*i = to_store;
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break;
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case HB_BFIND_NOT_FOUND_STORE_CLOSEST:
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*i = pos;
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break;
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}
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}
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return false;
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}
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template <typename T>
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bool bsearch_impl (const T &x, unsigned *pos) const
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{
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return hb_bsearch_impl (pos,
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x,
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this->arrayZ,
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this->length,
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sizeof (Type),
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_hb_cmp_method<T, Type>);
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}
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};
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template <typename T> inline hb_sorted_array_t<T>
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hb_sorted_array (T *array, unsigned int length)
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{ return hb_sorted_array_t<T> (array, length); }
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template <typename T, unsigned int length_> inline hb_sorted_array_t<T>
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hb_sorted_array (T (&array_)[length_])
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{ return hb_sorted_array_t<T> (array_); }
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template <typename T>
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bool hb_array_t<T>::operator == (const hb_array_t<T> &o) const
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{
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if (o.length != this->length) return false;
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for (unsigned int i = 0; i < this->length; i++) {
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if (this->arrayZ[i] != o.arrayZ[i]) return false;
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}
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return true;
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}
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/* TODO Specialize opeator== for hb_bytes_t and hb_ubytes_t. */
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template <>
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inline uint32_t hb_array_t<const char>::hash () const {
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uint32_t current = 0;
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for (unsigned int i = 0; i < this->length; i++)
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current = current * 31 + (uint32_t) (this->arrayZ[i] * 2654435761u);
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return current;
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}
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template <>
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inline uint32_t hb_array_t<const unsigned char>::hash () const {
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uint32_t current = 0;
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for (unsigned int i = 0; i < this->length; i++)
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current = current * 31 + (uint32_t) (this->arrayZ[i] * 2654435761u);
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return current;
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}
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typedef hb_array_t<const char> hb_bytes_t;
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typedef hb_array_t<const unsigned char> hb_ubytes_t;
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#endif /* HB_ARRAY_HH */
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