X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Fscm-hash.cc;h=cf0637a24f35352288f8bd327def99144548d91d;hb=d3e963c18f2e5958797018191abb9b861ac09bda;hp=ca0920fd42de2141a0c3edd6be15f970c9b61dee;hpb=06aaa8f02f831cfc94fcac1fb99eeded3b3cc6cc;p=lilypond.git

diff --git a/lily/scm-hash.cc b/lily/scm-hash.cc
index ca0920fd42..cf0637a24f 100644
--- a/lily/scm-hash.cc
+++ b/lily/scm-hash.cc
@@ -1,110 +1,155 @@
-/*   
-  scm-hash.cc --  implement Scheme_hash_table
-  
+/*
+  scm-hash.cc -- implement Scheme_hash_table
+
   source file of the GNU LilyPond music typesetter
-  
-  (c) 1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
-  
- */
-#include <stdio.h>
+
+  (c) 1999--2005 Han-Wen Nienhuys <hanwen@xs4all.nl>
+*/
 
 #include "scm-hash.hh"
-#include "hash-table-iter.hh"
+
+#include <cstdio>
+#include <algorithm>
+using namespace std;
+
+#include "ly-smobs.icc"
+
+/*
+  Return: number of objects.
+*/
+int
+copy_scm_hashes (SCM dest, SCM src)
+{
+  int k = 0;
+  for (int i = scm_c_vector_length (src); i--;)
+    for (SCM s = scm_vector_ref (src, scm_from_int (i)); scm_is_pair (s); s = scm_cdr (s))
+      {
+	scm_hashq_set_x (dest, scm_caar (s), scm_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 (scm_from_int (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 (scm_from_int (max ((int) 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 (scm_from_int (max ((int) 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);
+Scheme_hash_table::~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)
-{
-  hash_func_ = src.hash_func_;
-  self_scm_ = SCM_EOL;
-  smobify_self ();
-}
-
 int
 Scheme_hash_table::print_smob (SCM s, SCM p, scm_print_state*)
 {
-  assert (SMOB_IS_TYPE_B (Scheme_hash_table, s));
-  char str[1000];
-  sprintf (str, "#<Scheme_hash_table 0x%0ulx ", s);
-  scm_puts (str, p);      
-  Scheme_hash_table *me = SMOB_TO_TYPE(Scheme_hash_table,s);
-  for (Hash_table_iter<SCM,SCM> i (*me); i.ok(); i++)
+  assert (unsmob (s));
+  scm_puts ("#<Scheme_hash_table  ", p);
+  Scheme_hash_table *me = (Scheme_hash_table *) SCM_CELL_WORD_1 (s);
+  scm_display (me->hash_tab_, p);
+  scm_puts ("> ", p);
+  return 1;
+}
+
+bool
+Scheme_hash_table::try_retrieve (SCM k, SCM *v){
+
+  SCM handle = scm_hashq_get_handle (hash_tab_, k);
+  if (scm_is_pair (handle))
     {
-      scm_display (i.key(), p);
-      scm_puts (" = ",p);      
-      scm_display (i.val (), p);
-      scm_puts ("\n",p);            
+      *v = scm_cdr (handle);
+      return true;
     }
-  scm_puts ("> ",p);        
-  return 1;
+  else
+    return false;
 }
 
+bool
+Scheme_hash_table::contains (SCM k) const
+{
+  return scm_is_pair (scm_hashq_get_handle (hash_tab_, k));
+}
 
 void
 Scheme_hash_table::set (SCM k, SCM v)
 {
-  elem (k ) = v; 
-  scm_unprotect_object (v);
+  assert (scm_is_symbol (k));
+  SCM handle = scm_hashq_create_handle_x (hash_tab_, k, SCM_UNDEFINED);
+  if (scm_cdr (handle) == SCM_UNDEFINED)
+    elt_count_++;
+
+  scm_set_cdr_x (handle, v);
+
+  /*
+    resize if getting too large.
+  */
+  if (elt_count_ > 2 * scm_c_vector_length (hash_tab_))
+    {
+      SCM nh = scm_make_vector (scm_from_int (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)
+Scheme_hash_table::get (SCM k) const
 {
-  return elem (k);
+  /*
+    42 will stick out like a sore thumb, hopefully.
+  */
+  return scm_hashq_ref (hash_tab_, k, scm_from_int (42));
 }
 
-
-Scheme_hash_table::~Scheme_hash_table( )
+void
+Scheme_hash_table::remove (SCM k)
 {
-  unsmobify_self ();
+  scm_hashq_remove_x (hash_tab_, k);
+  /* Do not decrease elt_count_ as this may cause underflow.  The exact
+     value of elt_count_ is not important. */
 }
 
 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);
-  return l;  
+  SCM lst = SCM_EOL;
+  for (int i = scm_c_vector_length (hash_tab_); i--;)
+    for (SCM s = scm_vector_ref (hash_tab_, scm_from_int (i)); scm_is_pair (s);
+	 s = scm_cdr (s))
+      lst = scm_acons (scm_caar (s), scm_cdar (s), lst);
+  return lst;
 }
 
+IMPLEMENT_SMOBS (Scheme_hash_table);
+IMPLEMENT_DEFAULT_EQUAL_P (Scheme_hash_table);