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1 | /* Keeping a unique copy of strings. | |
2 | Copyright (C) 2002 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of Bison, the GNU Compiler Compiler. | |
5 | ||
6 | Bison is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2, or (at your option) | |
9 | any later version. | |
10 | ||
11 | Bison is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with Bison; see the file COPYING. If not, write to | |
18 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. */ | |
20 | ||
21 | #include "system.h" | |
22 | #include "quotearg.h" | |
23 | #include "error.h" | |
24 | #include "hash.h" | |
25 | #include "struniq.h" | |
26 | ||
27 | /*-----------------------. | |
28 | | A struniq hash table. | | |
29 | `-----------------------*/ | |
30 | ||
31 | /* Initial capacity of struniq hash table. */ | |
32 | #define HT_INITIAL_CAPACITY 257 | |
33 | ||
34 | static struct hash_table *struniqs_table = NULL; | |
35 | ||
36 | /*-------------------------------------. | |
37 | | Create the struniq for S if needed. | | |
38 | `-------------------------------------*/ | |
39 | ||
40 | const struniq_t | |
41 | struniq_new (const char *s) | |
42 | { | |
43 | struniq_t res = hash_lookup (struniqs_table, s); | |
44 | if (!res) | |
45 | { | |
46 | /* First insertion in the hash. */ | |
47 | res = xstrdup (s); | |
48 | hash_insert (struniqs_table, res); | |
49 | } | |
50 | return res; | |
51 | } | |
52 | ||
53 | ||
54 | /*---------------------------------. | |
55 | | Return TRUE iff S is a struniq. | | |
56 | `---------------------------------*/ | |
57 | ||
58 | bool | |
59 | struniq_assert_p (const char *s) | |
60 | { | |
61 | if (!hash_lookup (struniqs_table, s)) | |
62 | { | |
63 | error (0, 0, "not a struniq: %s", quotearg (s)); | |
64 | return false; | |
65 | } | |
66 | else | |
67 | { | |
68 | return true; | |
69 | } | |
70 | } | |
71 | ||
72 | ||
73 | /*--------------------. | |
74 | | Print the struniq. | | |
75 | `--------------------*/ | |
76 | ||
77 | static bool | |
78 | struniq_print (const struniq_t s) | |
79 | { | |
80 | fprintf (stderr, "%s\n", s); | |
81 | return true; | |
82 | } | |
83 | ||
84 | \f | |
85 | /*-----------------------. | |
86 | | A struniq hash table. | | |
87 | `-----------------------*/ | |
88 | ||
89 | static bool | |
90 | hash_compare_struniq_t (const struniq_t m1, const struniq_t m2) | |
91 | { | |
92 | return strcmp (m1, m2) == 0; | |
93 | } | |
94 | ||
95 | static unsigned int | |
96 | hash_struniq_t (const struniq_t m, unsigned int tablesize) | |
97 | { | |
98 | return hash_string (m, tablesize); | |
99 | } | |
100 | ||
101 | /* A function to apply to each symbol. */ | |
102 | typedef bool (*struniq_processor_t) (const struniq_t); | |
103 | ||
104 | /*----------------------------. | |
105 | | Create the struniqs table. | | |
106 | `----------------------------*/ | |
107 | ||
108 | void | |
109 | struniqs_new (void) | |
110 | { | |
111 | struniqs_table = hash_initialize (HT_INITIAL_CAPACITY, | |
112 | NULL, | |
113 | (Hash_hasher) hash_struniq_t, | |
114 | (Hash_comparator) hash_compare_struniq_t, | |
115 | (Hash_data_freer) free); | |
116 | } | |
117 | ||
118 | ||
119 | /*-------------------------------------. | |
120 | | Perform a task on all the struniqs. | | |
121 | `-------------------------------------*/ | |
122 | ||
123 | static void | |
124 | struniqs_do (struniq_processor_t processor, void *processor_data) | |
125 | { | |
126 | hash_do_for_each (struniqs_table, | |
127 | (Hash_processor) processor, | |
128 | processor_data); | |
129 | } | |
130 | ||
131 | ||
132 | /*-----------------. | |
133 | | Print them all. | | |
134 | `-----------------*/ | |
135 | ||
136 | void | |
137 | struniqs_print (void) | |
138 | { | |
139 | struniqs_do (struniq_print, NULL); | |
140 | } | |
141 | ||
142 | ||
143 | /*--------------------. | |
144 | | Free the struniqs. | | |
145 | `--------------------*/ | |
146 | ||
147 | void | |
148 | struniqs_free (void) | |
149 | { | |
150 | hash_free (struniqs_table); | |
151 | } |