227 lines
5.4 KiB
C
227 lines
5.4 KiB
C
/* -*-comment-start: "//";comment-end:""-*-
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* GNU Mes --- Maxwell Equations of Software
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* Copyright © 2018,2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
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* Copyright © 2019 Jeremiah Orians <jeremiah@pdp10.guru>
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*
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* This file is part of GNU Mes.
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*
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* GNU Mes is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* GNU Mes is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Mes. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "mes/lib.h"
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#include "mes/mes.h"
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#include <string.h>
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SCM
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hash_cstring (char *s, SCM size)
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{
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int h = s[0] * 37;
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if (s[0] && s[1])
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{
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h = h + s[1] * 43;
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}
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require (0 != size, "src/hash.c: hash_cstring must not be zero");
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h = h % size;
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return h;
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}
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SCM
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hashq_ (struct scm *x, SCM size)
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{
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struct scm *y = x;
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if (y->type == TSPECIAL || y->type == TSYMBOL)
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{
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char *p = y->cdr->string;
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return hash_cstring (p, size); /* FIXME: hash x directly */
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}
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error (cell_symbol_system_error, cons (make_string_ ("hashq_: not a symbol"), x));
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exit (EXIT_FAILURE);
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}
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SCM
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hash_ (struct scm *x, SCM size)
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{
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struct scm *y = x;
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if (y->type == TSTRING)
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{
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char *p = y->cdr->string;
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return hash_cstring (p, size);
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}
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require (FALSE, "src/hash.c: hash_ impossible condition hit");
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return hashq_ (x, size);
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}
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struct scm *
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hashq (struct scm *x, struct scm *size)
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{
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require (FALSE, "src/hash.c: hashq impossible condition hit");
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return make_number (hashq_ (x, size->value));
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}
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struct scm *
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hash (struct scm *x, struct scm *size)
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{
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require (FALSE, "src/hash.c: hash impossible condition hit");
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return make_number (hash_ (x, size->value));
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}
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struct scm *
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hashq_get_handle (struct scm *table, struct scm *key, struct scm *dflt)
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{
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struct scm *ydflt = dflt;
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if (ydflt->type == TPAIR)
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{
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return ydflt->car;
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}
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struct scm *ybucket = vector_ref_ (struct_ref_ (table, 4), hashq_ (key, struct_ref_ (table, 3)->value));
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if (ybucket->type == TPAIR)
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{
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return assq (key, ybucket);
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}
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return cell_f;
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}
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struct scm *
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hashq_ref (struct scm *table, struct scm *key, struct scm *dflt)
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{
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struct scm *x = hashq_get_handle (table, key, dflt);
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if (x == cell_f)
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{
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return x;
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}
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return x->cdr;
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}
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struct scm *
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hash_ref (struct scm *table, struct scm *key, struct scm *dflt) /* External */
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{
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struct scm *bucket = vector_ref_ (struct_ref_ (table, 4), hash_ (key, struct_ref_ (table, 3)->value));
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if (bucket->type == TPAIR)
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{
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struct scm *y = assoc (key, bucket);
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if (y != cell_f)
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{
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return y->cdr;
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}
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}
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return cell_f;
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}
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struct scm *
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hashq_set_x (struct scm *table, struct scm *key, struct scm *value)
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{
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SCM size = struct_ref_ (table, 3)->value;
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struct scm *buckets = struct_ref_ (table, 4);
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struct scm *ybucket = vector_ref_ (buckets, hashq_ (key, size));
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if (ybucket->type != TPAIR)
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{
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vector_set_x_ (buckets, hashq_ (key, size), acons (key, value, cell_nil));
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}
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else
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{
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vector_set_x_ (buckets, hashq_ (key, size),
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acons (key, value, vector_ref_ (buckets, hashq_ (key, size))));
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}
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return value;
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}
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struct scm *
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hash_set_x (struct scm *table, struct scm *key, struct scm *value)
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{
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SCM size = struct_ref_ (table, 3)->value;
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unsigned h = hash_ (key, size);
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struct scm *buckets = struct_ref_ (table, 4);
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struct scm *bucket = vector_ref_ (buckets, h);
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struct scm *ybucket = bucket;
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if (ybucket->type != TPAIR)
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{
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bucket = cell_nil;
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}
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bucket = acons (key, value, bucket);
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vector_set_x_ (buckets, h, bucket);
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return value;
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}
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struct scm *
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make_hashq_type () /* ((internal)) */
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{
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struct scm *record_type = cell_symbol_record_type; /* FIXME */
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struct scm *fields = cell_nil;
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fields = cons (cell_symbol_buckets, fields);
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fields = cons (cell_symbol_size, fields);
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fields = cons (fields, cell_nil);
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fields = cons (cell_symbol_hashq_table, fields);
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return make_struct (record_type, fields, cell_unspecified);
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}
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struct scm *
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make_hash_table_ (SCM size)
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{
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if (!size)
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{
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size = 100;
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}
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struct scm *hashq_type = make_hashq_type ();
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struct scm *buckets = make_vector__ (size);
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struct scm *values = cell_nil;
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values = cons (buckets, values);
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values = cons (make_number (size), values);
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values = cons (cell_symbol_hashq_table, values);
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/* FIXME: symbol/printer return make_struct (hashq_type, values, cstring_to_symbol ("hash-table-printer"); */
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return make_struct (hashq_type, values, cell_unspecified);
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}
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struct scm *
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make_hash_table (struct scm *x)
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{
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SCM size = 0;
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struct scm *y = x;
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if (y->type == TPAIR)
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{
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require (TNUMBER == y->type, "y->type must be TNUMBER\nsrc/hash.c: make_hash_table\n");
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size = y->value;
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}
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return make_hash_table_ (size);
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}
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/* Externally exposed */
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struct scm *
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hashq_set_x_ (struct scm *table, struct scm *key, struct scm *value)
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{
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return hashq_set_x (table, key, value);
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}
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struct scm *
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hash_ref_ (struct scm *table, struct scm *key, struct scm *dflt)
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{
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return hash_ref (table, key, dflt);
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}
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