2 scm-hash.cc -- implement Scheme_hash_table
4 source file of the GNU LilyPond music typesetter
6 (c) 1999--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
13 #include "ly-smobs.icc"
16 Return: number of objects.
19 copy_scm_hashes (SCM dest, SCM src)
22 for (int i = SCM_VECTOR_LENGTH (src); i--;)
23 for (SCM s = scm_vector_ref (src, scm_from_int (i)); scm_is_pair (s); s = scm_cdr (s))
25 scm_hashq_set_x (dest, scm_caar (s), scm_cdar (s));
32 Scheme_hash_table::Scheme_hash_table ()
36 hash_tab_ = scm_make_vector (scm_int2num (119), SCM_EOL);
41 Scheme_hash_table::Scheme_hash_table (Scheme_hash_table const &src)
48 hash_tab_ = scm_make_vector (scm_int2num (src.elt_count_ >? 11 ), SCM_EOL);
49 elt_count_ = copy_scm_hashes (hash_tab_, src.hash_tab_);
53 Scheme_hash_table::operator = (Scheme_hash_table const & src)
58 hash_tab_ = scm_make_vector (scm_int2num (src.elt_count_ >? 11), SCM_EOL);
59 elt_count_ = copy_scm_hashes (hash_tab_, src.hash_tab_);
62 Scheme_hash_table::~Scheme_hash_table ()
67 Scheme_hash_table::mark_smob (SCM s)
69 Scheme_hash_table *me = (Scheme_hash_table*) SCM_CELL_WORD_1 (s);
70 scm_gc_mark (me->hash_tab_);
75 Scheme_hash_table::print_smob (SCM s, SCM p, scm_print_state*)
79 sprintf (str, "#<Scheme_hash_table 0x%0lx ", SCM_UNPACK (s));
80 Scheme_hash_table *me = (Scheme_hash_table*) SCM_CELL_WORD_1 (s);
81 scm_display (me->hash_tab_, p);
87 Scheme_hash_table::try_retrieve (SCM k, SCM *v)
89 SCM handle = scm_hashq_get_handle (hash_tab_, k);
90 if (scm_is_pair (handle))
92 *v = scm_cdr (handle);
100 Scheme_hash_table::contains (SCM k) const
102 return scm_is_pair (scm_hashq_get_handle (hash_tab_, k));
106 Scheme_hash_table::set (SCM k, SCM v)
108 assert (scm_is_symbol (k));
109 SCM handle = scm_hashq_create_handle_x (hash_tab_, k, SCM_UNDEFINED);
110 if (scm_cdr (handle) == SCM_UNDEFINED)
113 scm_set_cdr_x (handle, v);
116 resize if getting too large.
118 if (elt_count_ > 2 * SCM_VECTOR_LENGTH (hash_tab_))
120 SCM nh = scm_make_vector (scm_int2num (3* elt_count_+1), SCM_EOL);
121 elt_count_ = copy_scm_hashes (nh, hash_tab_);
128 Scheme_hash_table::get (SCM k) const
131 42 will stick out like a sore thumb, hopefully.
133 return scm_hashq_ref (hash_tab_, k, scm_from_int (42));
137 Scheme_hash_table::remove (SCM k)
139 scm_hashq_remove_x (hash_tab_, k);
140 /* Do not decrease elt_count_ as this may cause underflow. The exact
141 value of elt_count_ is not important. */
145 Scheme_hash_table::to_alist () const
148 for (int i = SCM_VECTOR_LENGTH (hash_tab_); i--;)
149 for (SCM s = scm_vector_ref (hash_tab_, scm_int2num (i)); scm_is_pair (s);
151 lst = scm_acons (scm_caar (s), scm_cdar (s), lst);
155 IMPLEMENT_SMOBS (Scheme_hash_table);
156 IMPLEMENT_DEFAULT_EQUAL_P (Scheme_hash_table);