|
839
|
1 // Map.cc -*- C++ -*- |
|
728
|
2 /* |
|
|
3 |
|
1009
|
4 Copyright (C) 1992, 1993, 1994, 1995 John W. Eaton |
|
728
|
5 |
|
|
6 This file is part of Octave. |
|
|
7 |
|
|
8 Octave is free software; you can redistribute it and/or modify it |
|
|
9 under the terms of the GNU General Public License as published by the |
|
|
10 Free Software Foundation; either version 2, or (at your option) any |
|
|
11 later version. |
|
|
12 |
|
|
13 Octave is distributed in the hope that it will be useful, but WITHOUT |
|
|
14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
|
|
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
|
|
16 for more details. |
|
|
17 |
|
|
18 You should have received a copy of the GNU General Public License |
|
|
19 along with Octave; see the file COPYING. If not, write to the Free |
|
|
20 Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
|
|
21 |
|
|
22 */ |
|
|
23 |
|
745
|
24 /* |
|
|
25 |
|
|
26 The classes in this file are derived from the old `genclass' versions |
|
|
27 of Map and CHMap from libg++, originally: |
|
|
28 |
|
|
29 Copyright (C) 1988 Free Software Foundation |
|
|
30 written by Doug Lea (dl@rocky.oswego.edu) |
|
|
31 |
|
|
32 and distributed under the terms of the GNU Library General Public |
|
|
33 License as published by the Free Software Foundation. |
|
|
34 |
|
|
35 */ |
|
|
36 |
|
728
|
37 #ifdef HAVE_CONFIG_H |
|
1192
|
38 #include <config.h> |
|
728
|
39 #endif |
|
|
40 |
|
|
41 #include <iostream.h> |
|
|
42 |
|
|
43 #include "Map.h" |
|
|
44 |
|
|
45 static unsigned int |
|
|
46 hash (const char *str) |
|
|
47 { |
|
|
48 unsigned h = 0; |
|
|
49 while (*str) |
|
|
50 h = h * 33 + *str++; |
|
|
51 return h; |
|
|
52 } |
|
|
53 |
|
|
54 template <class C> |
|
|
55 Pix |
|
|
56 Map<C>::seek (const char *item) const |
|
|
57 { |
|
|
58 for (Pix i = first (); i != 0 && strcmp (key (i), item) != 0; next (i)) |
|
|
59 ; // Skip items until match found. |
|
|
60 |
|
|
61 return i; |
|
|
62 } |
|
|
63 |
|
|
64 template <class C> |
|
|
65 int |
|
|
66 Map<C>::owns (Pix idx) const |
|
|
67 { |
|
|
68 if (idx == 0) |
|
|
69 return 0; |
|
|
70 |
|
|
71 for (Pix i = first (); i != 0; next (i)) |
|
|
72 if (i == idx) |
|
|
73 return 1; |
|
|
74 |
|
|
75 return 0; |
|
|
76 } |
|
|
77 |
|
|
78 template <class C> |
|
|
79 void |
|
|
80 Map<C>::clear (void) |
|
|
81 { |
|
|
82 Pix i = first (); |
|
|
83 while (i != 0) |
|
|
84 { |
|
|
85 del (key (i)); |
|
|
86 i = first (); |
|
|
87 } |
|
|
88 } |
|
|
89 |
|
|
90 template <class C> |
|
|
91 int |
|
|
92 Map<C>::contains (const char *item) const |
|
|
93 { |
|
|
94 return seek (item) != 0; |
|
|
95 } |
|
|
96 |
|
|
97 template <class C> |
|
|
98 void |
|
|
99 Map<C>::error (const char* msg) const |
|
|
100 { |
|
|
101 cerr << "Map: " << msg << "\n"; |
|
|
102 } |
|
|
103 |
|
|
104 // CHMap class. |
|
|
105 |
|
|
106 // The nodes are linked together serially via a version of a trick |
|
|
107 // used in some vtables: odd pointers are actually links to the next |
|
|
108 // table entry. Not terrible, but not wonderful either. |
|
|
109 |
|
|
110 template <class C> |
|
755
|
111 static int |
|
728
|
112 goodCHptr (CHNode<C> *t) |
|
|
113 { |
|
|
114 return ((((unsigned) t) & 1) == 0); |
|
|
115 } |
|
|
116 |
|
|
117 // This sucks, but avoids g++ 2.6.0 `type unification failed' errors. |
|
|
118 |
|
755
|
119 static void * |
|
728
|
120 index_to_CHptr (int i) |
|
|
121 { |
|
|
122 return (void *) ((i << 1) + 1); |
|
|
123 } |
|
|
124 |
|
|
125 template <class C> |
|
755
|
126 static int |
|
728
|
127 CHptr_to_index (CHNode<C> *t) |
|
|
128 { |
|
|
129 return ((unsigned) t) >> 1; |
|
|
130 } |
|
|
131 |
|
|
132 template <class C> |
|
|
133 CHMap<C>::CHMap (const C& dflt, unsigned int sz) : Map<C> (dflt) |
|
|
134 { |
|
|
135 tab = new CHNode<C>* [size = sz]; |
|
|
136 for (unsigned int i = 0; i < size; ++i) |
|
|
137 tab[i] = (CHNode<C> *) index_to_CHptr (i+1); |
|
|
138 count = 0; |
|
|
139 } |
|
|
140 |
|
|
141 template <class C> |
|
|
142 CHMap<C>::CHMap (const CHMap& a) : Map<C> (a.def) |
|
|
143 { |
|
|
144 tab = new CHNode<C>* [size = a.size]; |
|
|
145 for (unsigned int i = 0; i < size; ++i) |
|
|
146 tab[i] = (CHNode<C> *) index_to_CHptr (i+1); |
|
|
147 count = 0; |
|
|
148 for (Pix p = a.first (); p; a.next (p)) |
|
|
149 (*this) [a.key (p)] = a.contents (p); |
|
|
150 } |
|
|
151 |
|
|
152 template <class C> |
|
|
153 Pix |
|
|
154 CHMap<C>::seek (const char *key) const |
|
|
155 { |
|
|
156 unsigned int h = hash (key) % size; |
|
|
157 |
|
|
158 for (CHNode<C> *t = tab[h]; goodCHptr (t); t = t->tl) |
|
|
159 if (strcmp (key, t->hd) == 0) |
|
|
160 return Pix (t); |
|
|
161 |
|
|
162 return 0; |
|
|
163 } |
|
|
164 |
|
|
165 template <class C> |
|
|
166 C& |
|
|
167 CHMap<C>::operator [] (const char *item) |
|
|
168 { |
|
|
169 unsigned int h = hash (item) % size; |
|
|
170 |
|
|
171 for (CHNode<C> *t = tab[h]; goodCHptr (t); t = t->tl) |
|
|
172 if (strcmp (item, t->hd) == 0) |
|
|
173 return t->cont; |
|
|
174 |
|
|
175 t = new CHNode<C> (item, def, tab[h]); |
|
|
176 tab[h] = t; |
|
|
177 ++count; |
|
|
178 return t->cont; |
|
|
179 } |
|
|
180 |
|
|
181 template <class C> |
|
|
182 void |
|
|
183 CHMap<C>::del (const char *key) |
|
|
184 { |
|
|
185 unsigned int h = hash (key) % size; |
|
|
186 |
|
|
187 CHNode<C> *t = tab[h]; |
|
|
188 CHNode<C> *trail = t; |
|
|
189 while (goodCHptr (t)) |
|
|
190 { |
|
|
191 if (strcmp (key, t->hd) == 0) |
|
|
192 { |
|
|
193 if (trail == t) |
|
|
194 tab[h] = t->tl; |
|
|
195 else |
|
|
196 trail->tl = t->tl; |
|
|
197 delete t; |
|
|
198 --count; |
|
|
199 return; |
|
|
200 } |
|
|
201 trail = t; |
|
|
202 t = t->tl; |
|
|
203 } |
|
|
204 } |
|
|
205 |
|
|
206 template <class C> |
|
|
207 void |
|
|
208 CHMap<C>::clear (void) |
|
|
209 { |
|
|
210 for (unsigned int i = 0; i < size; ++i) |
|
|
211 { |
|
|
212 CHNode<C> *p = tab[i]; |
|
|
213 tab[i] = (CHNode<C> *) index_to_CHptr (i+1); |
|
|
214 while (goodCHptr (p)) |
|
|
215 { |
|
|
216 CHNode<C> *nxt = p->tl; |
|
|
217 delete p; |
|
|
218 p = nxt; |
|
|
219 } |
|
|
220 } |
|
|
221 count = 0; |
|
|
222 } |
|
|
223 |
|
|
224 template <class C> |
|
|
225 Pix |
|
|
226 CHMap<C>::first (void) const |
|
|
227 { |
|
|
228 for (unsigned int i = 0; i < size; ++i) |
|
|
229 if (goodCHptr (tab[i])) |
|
|
230 return Pix (tab[i]); |
|
|
231 return 0; |
|
|
232 } |
|
|
233 |
|
|
234 template <class C> |
|
|
235 void |
|
|
236 CHMap<C>::next (Pix& p) const |
|
|
237 { |
|
|
238 CHNode<C> *t = ((CHNode<C> *) p)->tl; |
|
|
239 if (goodCHptr (t)) |
|
|
240 p = Pix (t); |
|
|
241 else |
|
|
242 { |
|
|
243 for (unsigned int i = CHptr_to_index (t); i < size; ++i) |
|
|
244 { |
|
|
245 if (goodCHptr (tab[i])) |
|
|
246 { |
|
|
247 p = Pix (tab[i]); |
|
|
248 return; |
|
|
249 } |
|
|
250 } |
|
|
251 p = 0; |
|
|
252 } |
|
|
253 } |
|
|
254 |
|
|
255 template <class C> |
|
|
256 int |
|
|
257 CHMap<C>::OK (void) const |
|
|
258 { |
|
|
259 int v = tab != 0; |
|
|
260 int n = 0; |
|
|
261 |
|
|
262 for (unsigned int i = 0; i < size; ++i) |
|
|
263 { |
|
|
264 for (CHNode<C> *p = tab[i]; goodCHptr (p); p = p->tl) |
|
|
265 ++n; |
|
|
266 |
|
|
267 v &= CHptr_to_index (p) == i + 1; |
|
|
268 } |
|
|
269 |
|
|
270 v &= count == n; |
|
|
271 |
|
|
272 if (! v) |
|
|
273 error ("invariant failure"); |
|
|
274 |
|
|
275 return v; |
|
|
276 } |
|
|
277 |
|
755
|
278 /* |
|
|
279 ;;; Local Variables: *** |
|
|
280 ;;; mode: C++ *** |
|
|
281 ;;; page-delimiter: "^/\\*" *** |
|
|
282 ;;; End: *** |
|
|
283 */ |
