lily/scm-hash.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1999--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5
   6   LilyPond is free software: you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation, either version 3 of the License, or
   9   (at your option) any later version.
  10
  11   LilyPond is distributed in the hope that it will be useful,
  12   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14   GNU General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "scm-hash.hh"
  21
  22 #include <cstdio>
  23 #include <algorithm>
  24 using namespace std;
  25
  26 #include "ly-smobs.icc"
  27
  28 /*
  29   Return: number of objects.
  30 */
  31 SCM
  32 copy_handle (void *closure, SCM handle)
  33 {
  34   SCM tab = (SCM) closure;
  35   scm_hashq_set_x (tab, scm_car (handle), scm_cdr (handle));
  36   return tab;
  37 }
  38
  39 static void
  40 copy_scm_hashes (SCM dest, SCM src)
  41 {
  42   scm_internal_hash_for_each_handle ((scm_t_hash_handle_fn) &copy_handle,
  43                                      dest, src);
  44 }
  45
  46 Scheme_hash_table::Scheme_hash_table ()
  47 {
  48   hash_tab_ = SCM_EOL;
  49   smobify_self ();
  50   hash_tab_ = scm_c_make_hash_table (119);
  51 }
  52
  53 Scheme_hash_table::Scheme_hash_table (Scheme_hash_table const &src)
  54 {
  55   hash_tab_ = SCM_EOL;
  56   smobify_self ();
  57   copy (src);
  58 }
  59
  60 void
  61 Scheme_hash_table::copy (Scheme_hash_table const &src)
  62 {
  63   if (&src == this)
  64     return;
  65
  66   hash_tab_ = scm_c_make_hash_table (SCM_HASHTABLE_N_ITEMS(src.hash_tab_));
  67   copy_scm_hashes (hash_tab_, src.hash_tab_);
  68 }
  69
  70 Scheme_hash_table::~Scheme_hash_table ()
  71 {
  72 }
  73
  74 SCM
  75 Scheme_hash_table::mark_smob (SCM s)
  76 {
  77   Scheme_hash_table *me = (Scheme_hash_table *) SCM_CELL_WORD_1 (s);
  78   scm_gc_mark (me->hash_tab_);
  79   return SCM_EOL;
  80 }
  81
  82 int
  83 Scheme_hash_table::print_smob (SCM s, SCM p, scm_print_state*)
  84 {
  85   assert (unsmob (s));
  86   scm_puts ("#<Scheme_hash_table  ", p);
  87   Scheme_hash_table *me = (Scheme_hash_table *) SCM_CELL_WORD_1 (s);
  88   scm_display (me->hash_tab_, p);
  89   scm_puts ("> ", p);
  90   return 1;
  91 }
  92
  93 bool
  94 Scheme_hash_table::try_retrieve (SCM k, SCM *v){
  95
  96   SCM handle = scm_hashq_get_handle (hash_tab_, k);
  97   if (scm_is_pair (handle))
  98     {
  99       *v = scm_cdr (handle);
 100       return true;
 101     }
 102   else
 103     return false;
 104 }
 105
 106 bool
 107 Scheme_hash_table::contains (SCM k) const
 108 {
 109   return scm_is_pair (scm_hashq_get_handle (hash_tab_, k));
 110 }
 111
 112 void
 113 Scheme_hash_table::set (SCM k, SCM v)
 114 {
 115   assert (scm_is_symbol (k));
 116   SCM handle = scm_hashq_create_handle_x (hash_tab_, k, SCM_UNDEFINED);
 117   scm_set_cdr_x (handle, v);
 118 }
 119
 120 SCM
 121 Scheme_hash_table::get (SCM k) const
 122 {
 123   /* SCM_UNSPECIFIED will stick out like a sore thumb, hopefully.
 124   */
 125   return scm_hashq_ref (hash_tab_, k, SCM_UNSPECIFIED);
 126 }
 127
 128 void
 129 Scheme_hash_table::remove (SCM k)
 130 {
 131   scm_hashq_remove_x (hash_tab_, k);
 132 }
 133
 134 static SCM
 135 collect_handles (void * /* closure */,
 136                  SCM key,
 137                  SCM value,
 138                  SCM result)
 139 {
 140   return scm_acons(key, value, result);
 141 }
 142
 143 SCM
 144 Scheme_hash_table::to_alist () const
 145 {
 146   return scm_internal_hash_fold ((scm_t_hash_fold_fn) &collect_handles,
 147                                  NULL, SCM_EOL, hash_tab_);
 148 }
 149
 150 IMPLEMENT_SMOBS (Scheme_hash_table);
 151 IMPLEMENT_DEFAULT_EQUAL_P (Scheme_hash_table);