kc3-lang/harfbuzz/src/hb-multimap.hh

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• Hash : 10c8fc55
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  Date : 2022-12-02T15:34:34
  

  [multimap] Add a multimap datastructure
  

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• src/hb-multimap.hh

• /*
   * Copyright © 2022  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.
   */
  
  #ifndef HB_MULTIMAP_HH
  #define HB_MULTIMAP_HH
  
  #include "hb.hh"
  #include "hb-map.hh"
  #include "hb-vector.hh"
  
  
  /*
   * hb_multimap_t
   */
  
  struct hb_multimap_t
  {
    void add (hb_codepoint_t k, hb_codepoint_t v)
    {
      hb_codepoint_t *i;
      if (multiples_indices.has (k, &i))
      {
        multiples_values[*i].push (v);
        return;
      }
  
      hb_codepoint_t *old_v;
      if (singulars.has (k, &old_v))
      {
        hb_codepoint_t old = *old_v;
        singulars.del (k);
  
        multiples_indices.set (k, multiples_values.length);
        auto *vec = multiples_values.push ();
  
        vec->push (old);
        vec->push (v);
  
        return;
      }
  
      singulars.set (k, v);
    }
  
    hb_array_t<hb_codepoint_t> get (hb_codepoint_t k)
    {
      hb_codepoint_t *v;
      if (singulars.has (k, &v))
        return hb_array (v, 1);
  
      hb_codepoint_t *i;
      if (multiples_indices.has (k, &i))
        return multiples_values[*i].as_array ();
  
      return hb_array_t<hb_codepoint_t> ();
    }
  
    bool in_error () const
    {
      return singulars.in_error () || multiples_indices.in_error () || multiples_values.in_error ();
    }
  
    protected:
    hb_map_t singulars;
    hb_map_t multiples_indices;
    hb_vector_t<hb_vector_t<hb_codepoint_t>> multiples_values;
  };
  
  
  
  #endif /* HB_MULTIMAP_HH */
  

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