Imported sources

[lilypond.git] / lily / scm-hash.cc

diff --git a/lily/scm-hash.cc b/lily/scm-hash.cc
index 4d417416f15ca4226394d99bb8292a8e29dd23d4..9fbd7c5153ae5408c7f5a806f24619096f4813ec 100644 (file)
--- a/lily/scm-hash.cc
+++ b/lily/scm-hash.cc
@@ -3,91 +3,165 @@
   
   source file of the GNU LilyPond music typesetter
   
-  (c) 1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+  (c) 1999--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   
  */
+#include <stdio.h>
 
 #include "scm-hash.hh"
-#include "hash-table-iter.hh"
+#include "ly-smobs.icc"
+
+/*
+  Return: number of objects.
+ */
+int
+copy_scm_hashes (SCM dest, SCM src)
+{
+  int k = 0;
+  for (int i = SCM_VECTOR_LENGTH (src); i--;)
+    for (SCM s = scm_vector_ref (src, SCM_MAKINUM (i)); ly_pair_p(s); s = ly_cdr (s))
+      {
+       scm_hashq_set_x (dest, ly_caar (s), ly_cdar (s));
+       k++;
+      }
+  return k ;
+}
+
 
 Scheme_hash_table::Scheme_hash_table ()
 {
-  hash_func_ = ly_scm_hash;
-  self_scm_ = SCM_EOL;
+  hash_tab_ = SCM_EOL;
   smobify_self ();
+  hash_tab_ = scm_make_vector (gh_int2scm (119), SCM_EOL);
+  elt_count_ = 0;
 }
 
-void
-Scheme_hash_table::operator =(Scheme_hash_table const & src)
+
+Scheme_hash_table::Scheme_hash_table (Scheme_hash_table const &src)
+
 {
-  Hash_table<SCM,SCM>::operator = (src);
-       
-  // we do not copy the self_scm_ field!
+  hash_tab_ = SCM_EOL;
+  elt_count_ = 0;
+  smobify_self ();
+
+  hash_tab_ = scm_make_vector (gh_int2scm (src.elt_count_ >? 11 ), SCM_EOL);  
+  elt_count_ = copy_scm_hashes (hash_tab_, src.hash_tab_);
 }
 
 void
-Scheme_hash_table::do_smobify_self ()
+Scheme_hash_table::operator = (Scheme_hash_table const & src)
 {
+  if (&src == this)
+    return;
+  
+  hash_tab_ = scm_make_vector (gh_int2scm (src.elt_count_ >? 11), SCM_EOL);  
+  elt_count_ = copy_scm_hashes (hash_tab_, src.hash_tab_);
 }
 
-#include "ly-smobs.icc"
-IMPLEMENT_SMOBS(Scheme_hash_table);
-
 SCM
 Scheme_hash_table::mark_smob (SCM s)
 {
-  /*
-    can't typecheck naively, since GC bit lives in CAR of S
-   */
-  //assert (SMOB_IS_TYPE_B (Scheme_hash_table, s));
-  
-  Scheme_hash_table *me = SMOB_TO_TYPE(Scheme_hash_table,s);
-  for (Hash_table_iter<SCM,SCM> i (*me); i.ok(); i++)
-    {
-      scm_gc_mark (i.key());
-      scm_gc_mark (i.val ());
-    }
+  Scheme_hash_table *me = (Scheme_hash_table*) SCM_CELL_WORD_1 (s);
+  scm_gc_mark (me->hash_tab_);
   return SCM_EOL;
 }
 
-
-Scheme_hash_table::Scheme_hash_table (Scheme_hash_table const &src)
-  : Hash_table<SCM,SCM> (src)
+int
+Scheme_hash_table::print_smob (SCM s, SCM p, scm_print_state*)
 {
-  hash_func_ = src.hash_func_;
-  self_scm_ = SCM_EOL;
-  smobify_self ();
+  assert (unsmob (s));
+  char str[1000];
+  sprintf (str, "#<Scheme_hash_table 0x%0lx ", SCM_UNPACK(s));
+  Scheme_hash_table *me = (Scheme_hash_table*) SCM_CELL_WORD_1 (s);
+  scm_display (me->hash_tab_, p);      
+  scm_puts ("> ",p);        
+  return 1;
 }
 
-int
-Scheme_hash_table::print_smob (SCM s, SCM p, scm_print_state*)
+bool
+Scheme_hash_table::try_retrieve (SCM k, SCM *v)
 {
-  assert (SMOB_IS_TYPE_B (Scheme_hash_table, s));
-  Scheme_hash_table *me = SMOB_TO_TYPE(Scheme_hash_table,s);
-  for (Hash_table_iter<SCM,SCM> i (*me); i.ok(); i++)
+  SCM handle = scm_hashq_get_handle (hash_tab_, k);
+  if (ly_pair_p (handle))
     {
-      scm_display (i.key(), p);
-      scm_puts (" = ",p);      
-      scm_display (i.val (), p);
-      scm_puts ("\n",p);            
+      *v = ly_cdr (handle);
+      return true;
     }
-  return 1;
+  else
+    return false;
+
 }
 
+bool
+Scheme_hash_table::contains (SCM k) const
+{
+  return ly_pair_p (scm_hashq_get_handle (hash_tab_, k));
+}
 
+void
+Scheme_hash_table::set (SCM k, SCM v)
+{
+  assert (gh_symbol_p (k));
+  SCM handle = scm_hashq_create_handle_x (hash_tab_, k, SCM_UNDEFINED);
+  if (ly_cdr (handle) == SCM_UNDEFINED)
+    {
+      elt_count_++;
+    }
+  
+  gh_set_cdr_x (handle, v);
+
+  /*
+    resize if getting too large.
+  */
+  if (elt_count_ > 2 * SCM_VECTOR_LENGTH (hash_tab_))
+    {
+      SCM nh = scm_make_vector (gh_int2scm (3* elt_count_+1), SCM_EOL);
+      elt_count_ = copy_scm_hashes (nh, hash_tab_);
+      hash_tab_ = nh;
+    }
+}
+
+// UGH. 
+SCM
+Scheme_hash_table::get (SCM k)const
+{
+  /*
+    42 will stick out like a sore thumb, hopefully.
+   */
+  return scm_hashq_ref (hash_tab_, k, SCM_MAKINUM(42));
+}
 
+void
+Scheme_hash_table::remove (SCM k)
+{
+  scm_hashq_remove_x (hash_tab_, k);
+  /*
+    don't decrease elt_count_ , as this may cause underflow. The exact
+    value of elt_count_ is not important.
+   */
+}
 
-Scheme_hash_table::~Scheme_hash_table( )
+Scheme_hash_table::~Scheme_hash_table ()
 {
-  unsmobify_self ();
 }
 
 SCM
 Scheme_hash_table::to_alist () const
 {
   SCM l = SCM_EOL;
-  for (Hash_table_iter<SCM,SCM> i (*this); i.ok(); i++)
-    l = gh_cons (gh_cons (i.key (), i.val()), l);
+  for (int i = SCM_VECTOR_LENGTH (hash_tab_); i--;)
+    for (SCM s = scm_vector_ref (hash_tab_, gh_int2scm (i)); ly_pair_p(s); s = ly_cdr (s))
+      {
+       l = scm_acons (ly_caar (s), ly_cdar (s), l);
+      }
   return l;  
 }
 
+
+
+
+
+IMPLEMENT_SMOBS (Scheme_hash_table);
+IMPLEMENT_DEFAULT_EQUAL_P (Scheme_hash_table);
+
+