2 scm-hash.cc -- implement Scheme_hash_table
4 source file of the GNU LilyPond music typesetter
6 (c) 1999--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
14 #include "ly-smobs.icc"
19 Return: number of objects.
22 copy_scm_hashes (SCM dest, SCM src)
25 for (int i = scm_c_vector_length (src); i--;)
26 for (SCM s = scm_vector_ref (src, scm_from_int (i)); scm_is_pair (s); s = scm_cdr (s))
28 scm_hashq_set_x (dest, scm_caar (s), scm_cdar (s));
34 Scheme_hash_table::Scheme_hash_table ()
38 hash_tab_ = scm_make_vector (scm_from_int (119), SCM_EOL);
42 Scheme_hash_table::Scheme_hash_table (Scheme_hash_table const &src)
49 hash_tab_ = scm_make_vector (scm_from_int (max ((int) src.elt_count_, 11)), SCM_EOL);
50 elt_count_ = copy_scm_hashes (hash_tab_, src.hash_tab_);
54 Scheme_hash_table::operator = (Scheme_hash_table const &src)
59 hash_tab_ = scm_make_vector (scm_from_int (max ((int) src.elt_count_, 11)), SCM_EOL);
60 elt_count_ = copy_scm_hashes (hash_tab_, src.hash_tab_);
63 Scheme_hash_table::~Scheme_hash_table ()
68 Scheme_hash_table::mark_smob (SCM s)
70 Scheme_hash_table *me = (Scheme_hash_table *) SCM_CELL_WORD_1 (s);
71 scm_gc_mark (me->hash_tab_);
76 Scheme_hash_table::print_smob (SCM s, SCM p, scm_print_state*)
79 scm_puts ("#<Scheme_hash_table ", p);
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_c_vector_length (hash_tab_))
120 SCM nh = scm_make_vector (scm_from_int (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_c_vector_length (hash_tab_); i--;)
149 for (SCM s = scm_vector_ref (hash_tab_, scm_from_int (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);