lily/scm-hash.cc

   1 /*
   2   scm-hash.cc -- implement Scheme_hash_table
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1999--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #include "scm-hash.hh"
  10
  11 #include <cstdio>
  12 #include <algorithm>
  13 using namespace std;
  14
  15 #include "ly-smobs.icc"
  16
  17 /*
  18   Return: number of objects.
  19 */
  20 SCM
  21 copy_handle (void *closure, SCM handle)
  22 {
  23   SCM tab = (SCM) closure;
  24   scm_hashq_set_x (tab, scm_car (handle), scm_cdr (handle));
  25   return tab;
  26 }
  27
  28 static void
  29 copy_scm_hashes (SCM dest, SCM src)
  30 {
  31   scm_internal_hash_for_each_handle (  (SCM (*)(GUILE_ELLIPSIS)) &copy_handle, dest, src);
  32 }
  33
  34 Scheme_hash_table::Scheme_hash_table ()
  35 {
  36   hash_tab_ = SCM_EOL;
  37   smobify_self ();
  38   hash_tab_ = scm_c_make_hash_table (119);
  39 }
  40
  41 Scheme_hash_table::Scheme_hash_table (Scheme_hash_table const &src)
  42 {
  43   hash_tab_ = SCM_EOL;
  44   smobify_self ();
  45   copy (src);
  46 }
  47
  48 void
  49 Scheme_hash_table::copy (Scheme_hash_table const &src)
  50 {
  51   if (&src == this)
  52     return;
  53
  54   hash_tab_ = scm_c_make_hash_table (SCM_HASHTABLE_N_ITEMS(src.hash_tab_));
  55   copy_scm_hashes (hash_tab_, src.hash_tab_);
  56 }
  57
  58 Scheme_hash_table::~Scheme_hash_table ()
  59 {
  60 }
  61
  62 SCM
  63 Scheme_hash_table::mark_smob (SCM s)
  64 {
  65   Scheme_hash_table *me = (Scheme_hash_table *) SCM_CELL_WORD_1 (s);
  66   scm_gc_mark (me->hash_tab_);
  67   return SCM_EOL;
  68 }
  69
  70 int
  71 Scheme_hash_table::print_smob (SCM s, SCM p, scm_print_state*)
  72 {
  73   assert (unsmob (s));
  74   scm_puts ("#<Scheme_hash_table  ", p);
  75   Scheme_hash_table *me = (Scheme_hash_table *) SCM_CELL_WORD_1 (s);
  76   scm_display (me->hash_tab_, p);
  77   scm_puts ("> ", p);
  78   return 1;
  79 }
  80
  81 bool
  82 Scheme_hash_table::try_retrieve (SCM k, SCM *v){
  83
  84   SCM handle = scm_hashq_get_handle (hash_tab_, k);
  85   if (scm_is_pair (handle))
  86     {
  87       *v = scm_cdr (handle);
  88       return true;
  89     }
  90   else
  91     return false;
  92 }
  93
  94 bool
  95 Scheme_hash_table::contains (SCM k) const
  96 {
  97   return scm_is_pair (scm_hashq_get_handle (hash_tab_, k));
  98 }
  99
 100 void
 101 Scheme_hash_table::set (SCM k, SCM v)
 102 {
 103   assert (scm_is_symbol (k));
 104   SCM handle = scm_hashq_create_handle_x (hash_tab_, k, SCM_UNDEFINED);
 105   scm_set_cdr_x (handle, v);
 106 }
 107
 108 SCM
 109 Scheme_hash_table::get (SCM k) const
 110 {
 111   /* SCM_UNSPECIFIED will stick out like a sore thumb, hopefully.
 112   */
 113   return scm_hashq_ref (hash_tab_, k, SCM_UNSPECIFIED);
 114 }
 115
 116 void
 117 Scheme_hash_table::remove (SCM k)
 118 {
 119   scm_hashq_remove_x (hash_tab_, k);
 120 }
 121
 122 static SCM
 123 collect_handles (void *closure, SCM key, SCM value, SCM result)
 124 {
 125   (void) closure;
 126   return scm_acons(key, value, result);
 127 }
 128
 129 SCM
 130 Scheme_hash_table::to_alist () const
 131 {
 132   return scm_internal_hash_fold ((SCM (*)(GUILE_ELLIPSIS)) &collect_handles, NULL, SCM_EOL, hash_tab_);
 133 }
 134
 135 IMPLEMENT_SMOBS (Scheme_hash_table);
 136 IMPLEMENT_DEFAULT_EQUAL_P (Scheme_hash_table);