|
1
|
1 // variables.cc -*- C++ -*- |
|
|
2 /* |
|
|
3 |
|
|
4 Copyright (C) 1992, 1993 John W. Eaton |
|
|
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 |
|
|
24 #ifdef __GNUG__ |
|
|
25 #pragma implementation |
|
|
26 #endif |
|
|
27 |
|
|
28 #include <sys/types.h> |
|
|
29 #ifdef HAVE_UNISTD_H |
|
|
30 #include <unistd.h> |
|
|
31 #endif |
|
|
32 #include <ctype.h> |
|
|
33 #include <iostream.h> |
|
|
34 |
|
|
35 #include "statdefs.h" |
|
|
36 #include "tree-const.h" |
|
|
37 #include "variables.h" |
|
|
38 #include "symtab.h" |
|
|
39 #include "error.h" |
|
|
40 #include "utils.h" |
|
|
41 #include "tree.h" |
|
|
42 |
|
|
43 // Symbol table for symbols at the top level. |
|
|
44 symbol_table *top_level_sym_tab; |
|
|
45 |
|
|
46 // Symbol table for the current scope. |
|
|
47 symbol_table *curr_sym_tab; |
|
|
48 |
|
|
49 // Symbol table for global symbols. |
|
|
50 symbol_table *global_sym_tab; |
|
|
51 |
|
|
52 /* |
|
|
53 * Is there a corresponding M-file that is newer than the symbol |
|
|
54 * definition? |
|
|
55 */ |
|
|
56 int |
|
|
57 symbol_out_of_date (symbol_record *sr) |
|
|
58 { |
|
|
59 int status = 0; |
|
|
60 if (sr != (symbol_record *) NULL) |
|
|
61 { |
|
|
62 tree *ans = sr->def (); |
|
|
63 if (ans != NULL_TREE) |
|
|
64 { |
|
|
65 char *mf = ans->m_file_name (); |
|
|
66 if (mf != (char *) NULL) |
|
|
67 { |
|
|
68 time_t tp = ans->time_parsed (); |
|
|
69 status = is_newer (mf, tp); |
|
|
70 } |
|
|
71 } |
|
|
72 } |
|
|
73 return status; |
|
|
74 } |
|
|
75 |
|
|
76 /* |
|
|
77 * Force a symbol into the global symbol table. |
|
|
78 */ |
|
|
79 symbol_record * |
|
|
80 force_global (char *name) |
|
|
81 { |
|
|
82 symbol_record *retval = (symbol_record *) NULL; |
|
|
83 |
|
|
84 if (valid_identifier (name)) |
|
|
85 { |
|
|
86 symbol_record *sr; |
|
|
87 sr = curr_sym_tab->lookup (name, 0, 0); |
|
|
88 if (sr == (symbol_record *) NULL) |
|
|
89 { |
|
|
90 retval = global_sym_tab->lookup (name, 1, 0); |
|
|
91 } |
|
|
92 else if (sr->is_formal_parameter ()) |
|
|
93 { |
|
|
94 error ("formal parameter `%s' can't be made global", name); |
|
|
95 } |
|
|
96 else |
|
|
97 { |
|
|
98 retval = global_sym_tab->lookup (name, 1, 0); |
|
|
99 retval->alias (sr); |
|
|
100 curr_sym_tab->clear (name); |
|
|
101 } |
|
|
102 } |
|
|
103 else |
|
|
104 warning ("`%s' is invalid as an identifier", name); |
|
|
105 |
|
|
106 return retval; |
|
|
107 } |
|
|
108 |
|
|
109 int |
|
|
110 bind_variable (char *varname, tree_constant *val) |
|
|
111 { |
|
|
112 // Look for the symbol in the current symbol table. If it's there, |
|
|
113 // great. If not, don't insert it, but look for it in the global |
|
|
114 // symbol table. If it's there, great. If not, insert it in the |
|
|
115 // original current symbol table. |
|
|
116 |
|
|
117 symbol_record *sr; |
|
|
118 sr = curr_sym_tab->lookup (varname, 0, 0); |
|
|
119 if (sr == (symbol_record *) NULL) |
|
|
120 { |
|
|
121 sr = global_sym_tab->lookup (varname, 0, 0); |
|
|
122 if (sr == (symbol_record *) NULL) |
|
|
123 { |
|
|
124 sr = curr_sym_tab->lookup (varname, 1); |
|
|
125 } |
|
|
126 } |
|
|
127 |
|
|
128 if (sr != (symbol_record *) NULL) |
|
|
129 { |
|
|
130 sr->define (val); |
|
|
131 return 0; |
|
|
132 } |
|
|
133 else |
|
|
134 return 1; |
|
|
135 } |
|
|
136 |
|
|
137 int |
|
|
138 bind_protected_variable (char *varname, tree_constant *val) |
|
|
139 { |
|
|
140 // Look for the symbol in the current symbol table. If it's there, |
|
|
141 // great. If not, don't insert it, but look for it in the global |
|
|
142 // symbol table. If it's there, great. If not, insert it in the |
|
|
143 // original current symbol table. |
|
|
144 |
|
|
145 symbol_record *sr; |
|
|
146 sr = curr_sym_tab->lookup (varname, 0, 0); |
|
|
147 if (sr == (symbol_record *) NULL) |
|
|
148 { |
|
|
149 sr = global_sym_tab->lookup (varname, 0, 0); |
|
|
150 if (sr == (symbol_record *) NULL) |
|
|
151 { |
|
|
152 sr = curr_sym_tab->lookup (varname, 1); |
|
|
153 } |
|
|
154 } |
|
|
155 |
|
|
156 if (sr != (symbol_record *) NULL) |
|
|
157 { |
|
|
158 sr->unprotect (); |
|
|
159 sr->define (val); |
|
|
160 sr->protect (); |
|
|
161 return 0; |
|
|
162 } |
|
|
163 else |
|
|
164 return 1; |
|
|
165 } |
|
|
166 |
|
|
167 /* |
|
|
168 * Look for name first in current then in global symbol tables. If |
|
|
169 * name is found and it refers to a string, return a new string |
|
|
170 * containing its value. Otherwise, return NULL. |
|
|
171 */ |
|
|
172 char * |
|
|
173 octave_string_variable (char *name) |
|
|
174 { |
|
|
175 char *retval = (char *) NULL; |
|
|
176 symbol_record *sr; |
|
|
177 sr = curr_sym_tab->lookup (name, 0, 0); |
|
|
178 if (sr == (symbol_record *) NULL) |
|
|
179 { |
|
|
180 sr = global_sym_tab->lookup (name, 0, 0); |
|
|
181 if (sr == (symbol_record *) NULL) |
|
|
182 return retval; |
|
|
183 } |
|
|
184 |
|
|
185 tree *defn = sr->def (); |
|
|
186 if (defn != NULL_TREE) |
|
|
187 { |
|
|
188 tree_constant val = defn->eval (0); |
|
|
189 if (val.is_string_type ()) |
|
|
190 { |
|
|
191 char *s = val.string_value (); |
|
|
192 if (s != (char *) NULL) |
|
|
193 retval = strsave (s); |
|
|
194 } |
|
|
195 } |
|
|
196 |
|
|
197 return retval; |
|
|
198 } |
|
|
199 |
|
|
200 /* |
|
|
201 * Look for name first in current then in global symbol tables. If |
|
|
202 * name is found and it refers to a real scalar, place the value in d |
|
|
203 * and return 0. Otherwise, return -1. |
|
|
204 */ |
|
|
205 int |
|
|
206 octave_real_scalar_variable (char *name, double& d) |
|
|
207 { |
|
|
208 int status = -1; |
|
|
209 symbol_record *sr; |
|
|
210 sr = curr_sym_tab->lookup (name, 0, 0); |
|
|
211 if (sr == (symbol_record *) NULL) |
|
|
212 { |
|
|
213 sr = global_sym_tab->lookup (name, 0, 0); |
|
|
214 if (sr == (symbol_record *) NULL) |
|
|
215 return status; |
|
|
216 } |
|
|
217 |
|
|
218 tree *defn = sr->def (); |
|
|
219 if (defn != NULL_TREE) |
|
|
220 { |
|
|
221 tree_constant val = defn->eval (0); |
|
|
222 if (val.const_type () == tree_constant_rep::scalar_constant) |
|
|
223 { |
|
|
224 d = val.double_value (); |
|
|
225 status = 0; |
|
|
226 } |
|
|
227 } |
|
|
228 |
|
|
229 return status; |
|
|
230 } |
|
|
231 |
|
|
232 /* |
|
|
233 * Extract a keyword and its value from a file. Input should look |
|
|
234 * something like: |
|
|
235 * |
|
|
236 * #[ \t]*keyword[ \t]*:[ \t]*string-value\n |
|
|
237 */ |
|
|
238 int |
|
|
239 extract_keyword (istream& is, char *keyword, char *value) |
|
|
240 { |
|
|
241 char *ptr = value; |
|
|
242 |
|
|
243 int status = 0; |
|
|
244 |
|
|
245 char c; |
|
|
246 while (is.get (c)) |
|
|
247 { |
|
|
248 if (c == '#') |
|
|
249 { |
|
|
250 while (is.get (c) && (c == ' ' || c == '\t' || c == '#')) |
|
|
251 ; // Skip whitespace and comment characters. |
|
|
252 |
|
|
253 if (isalpha (c)) |
|
|
254 *ptr++ = c; |
|
|
255 |
|
|
256 while (is.get (c) && isalpha (c)) |
|
|
257 *ptr++ = c; |
|
|
258 |
|
|
259 if (strncmp (value, keyword, strlen (keyword)) == 0) |
|
|
260 { |
|
|
261 ptr = value; |
|
|
262 while (is.get (c) && (c == ' ' || c == '\t' || c == ':')) |
|
|
263 ; // Skip whitespace and the colon. |
|
|
264 |
|
|
265 if (c != '\n') |
|
|
266 { |
|
|
267 *ptr++ = c; |
|
|
268 while (is.get (c) && c != '\n') |
|
|
269 *ptr++ = c; |
|
|
270 } |
|
|
271 *ptr = '\0'; |
|
|
272 status = 1; |
|
|
273 break; |
|
|
274 } |
|
|
275 } |
|
|
276 } |
|
|
277 return status; |
|
|
278 } |
|
|
279 |
|
|
280 int |
|
|
281 extract_keyword (istream& is, char *keyword, int& value) |
|
|
282 { |
|
|
283 char buf [128]; |
|
|
284 char *ptr = buf; |
|
|
285 |
|
|
286 int status = 0; |
|
|
287 value = 0; |
|
|
288 |
|
|
289 char c; |
|
|
290 while (is.get (c)) |
|
|
291 { |
|
|
292 if (c == '#') |
|
|
293 { |
|
|
294 while (is.get (c) && (c == ' ' || c == '\t' || c == '#')) |
|
|
295 ; // Skip whitespace and comment characters. |
|
|
296 |
|
|
297 if (isalpha (c)) |
|
|
298 *ptr++ = c; |
|
|
299 |
|
|
300 while (is.get (c) && isalpha (c)) |
|
|
301 *ptr++ = c; |
|
|
302 |
|
|
303 if (strncmp (buf, keyword, strlen (keyword)) == 0) |
|
|
304 { |
|
|
305 ptr = buf; |
|
|
306 while (is.get (c) && (c == ' ' || c == '\t' || c == ':')) |
|
|
307 ; // Skip whitespace and the colon. |
|
|
308 |
|
|
309 is.putback (c); |
|
|
310 if (c != '\n') |
|
|
311 is >> value; |
|
|
312 if (is) |
|
|
313 status = 1; |
|
|
314 while (is.get (c) && c != '\n') |
|
|
315 ; // Skip to beginning of next line; |
|
|
316 break; |
|
|
317 } |
|
|
318 } |
|
|
319 } |
|
|
320 return status; |
|
|
321 } |
|
|
322 |
|
|
323 /* |
|
|
324 * Skip trailing white space and |
|
|
325 */ |
|
|
326 void |
|
|
327 skip_comments (istream& is) |
|
|
328 { |
|
|
329 char c = '\0'; |
|
|
330 while (is.get (c)) |
|
|
331 { |
|
|
332 if (c == ' ' || c == '\t' || c == '\n') |
|
|
333 ; // Skip whitespace on way to beginning of next line. |
|
|
334 else |
|
|
335 break; |
|
|
336 } |
|
|
337 |
|
|
338 for (;;) |
|
|
339 { |
|
|
340 if (is && c == '#') |
|
|
341 while (is.get (c) && c != '\n') |
|
|
342 ; // Skip to beginning of next line, ignoring everything. |
|
|
343 else |
|
|
344 break; |
|
|
345 } |
|
|
346 } |
|
|
347 |
|
|
348 /* |
|
|
349 * Is `s' a valid identifier? |
|
|
350 */ |
|
|
351 int |
|
|
352 valid_identifier (char *s) |
|
|
353 { |
|
|
354 if (s == (char *) NULL || ! (isalnum (*s) || *s == '_')) |
|
|
355 return 0; |
|
|
356 |
|
|
357 while (*++s != '\0') |
|
|
358 if (! (isalnum (*s) || *s == '_')) |
|
|
359 return 0; |
|
|
360 |
|
|
361 return 1; |
|
|
362 } |
|
|
363 |
|
|
364 /* |
|
|
365 * See if the identifier is in scope. |
|
|
366 */ |
|
|
367 int |
|
|
368 identifier_exists (char *name) |
|
|
369 { |
|
|
370 int status = 0; |
|
|
371 |
|
|
372 if (curr_sym_tab->lookup (name, 0, 0) != (symbol_record *) NULL |
|
|
373 || global_sym_tab->lookup (name, 0, 0) != (symbol_record *) NULL) |
|
|
374 status = 1; |
|
|
375 else |
|
|
376 { |
|
|
377 char *path = m_file_in_path (name); |
|
|
378 if (path != (char *) NULL) |
|
|
379 { |
|
|
380 delete [] path; |
|
|
381 status = 2; |
|
|
382 } |
|
|
383 else |
|
|
384 { |
|
|
385 struct stat buf; |
|
|
386 if (stat (name, &buf) == 0 && S_ISREG (buf.st_mode)) |
|
|
387 status = 2; |
|
|
388 } |
|
|
389 |
|
|
390 } |
|
|
391 return status; |
|
|
392 } |
|
|
393 |
|
|
394 /* |
|
|
395 * Is this tree_constant a valid function? |
|
|
396 */ |
|
|
397 tree * |
|
|
398 is_valid_function (tree_constant& arg, char *warn_for, int warn = 0) |
|
|
399 { |
|
|
400 tree *ans = NULL_TREE; |
|
|
401 |
|
|
402 if (! arg.is_string_type ()) |
|
|
403 { |
|
|
404 if (warn) |
|
|
405 message (warn_for, "expecting function name as argument"); |
|
|
406 return ans; |
|
|
407 } |
|
|
408 |
|
|
409 char *fcn_name = arg.string_value (); |
|
|
410 symbol_record *sr = global_sym_tab->lookup (fcn_name, 0, 0); |
|
|
411 |
|
|
412 if (sr == (symbol_record *) NULL) |
|
|
413 { |
|
|
414 sr = global_sym_tab->lookup (fcn_name, 1, 0); |
|
|
415 tree_identifier tmp (sr); |
|
|
416 tmp.parse_m_file (0); |
|
|
417 } |
|
|
418 else if (symbol_out_of_date (sr)) |
|
|
419 { |
|
|
420 tree_identifier tmp (sr); |
|
|
421 tmp.parse_m_file (0); |
|
|
422 } |
|
|
423 |
|
|
424 ans = sr->def (); |
|
|
425 if (ans == NULL_TREE || ! sr->is_function ()) |
|
|
426 { |
|
|
427 if (warn) |
|
|
428 message (warn_for, "the symbol `%s' is not valid as a function", |
|
|
429 fcn_name); |
|
|
430 ans = NULL_TREE; |
|
|
431 } |
|
|
432 |
|
|
433 return ans; |
|
|
434 } |
|
|
435 |
|
|
436 /* |
|
|
437 * Does this function take the right number of arguments? |
|
|
438 */ |
|
|
439 int |
|
|
440 takes_correct_nargs (tree *fcn, int expected_nargin, char *warn_for, |
|
|
441 int warn = 0) |
|
|
442 { |
|
|
443 int nargs = fcn->max_expected_args () - 1; |
|
|
444 int e_nargs = expected_nargin - 1; |
|
|
445 if (nargs != e_nargs) |
|
|
446 { |
|
|
447 if (warn) |
|
|
448 message (warn_for, "expecting function to take %d argument%c", |
|
|
449 e_nargs, s_plural (e_nargs)); |
|
|
450 return 0; |
|
|
451 } |
|
|
452 return 1; |
|
|
453 } |
|
|
454 |
|
|
455 char ** |
|
|
456 make_name_list (void) |
|
|
457 { |
|
|
458 int key_len = 0; |
|
|
459 int glb_len = 0; |
|
|
460 int top_len = 0; |
|
|
461 int lcl_len = 0; |
|
|
462 int mfl_len = 0; |
|
|
463 |
|
|
464 char **key = (char **) NULL; |
|
|
465 char **glb = (char **) NULL; |
|
|
466 char **top = (char **) NULL; |
|
|
467 char **lcl = (char **) NULL; |
|
|
468 char **mfl = (char **) NULL; |
|
|
469 |
|
|
470 key = names (keyword_help (), key_len); |
|
|
471 glb = global_sym_tab->list (glb_len); |
|
|
472 top = top_level_sym_tab->list (top_len); |
|
|
473 if (top_level_sym_tab != curr_sym_tab) |
|
|
474 lcl = curr_sym_tab->list (lcl_len); |
|
|
475 mfl = get_m_file_names (mfl_len, 1); |
|
|
476 |
|
|
477 int total_len = key_len + glb_len + top_len + lcl_len + mfl_len; |
|
|
478 |
|
|
479 char **list = new char * [total_len+1]; |
|
|
480 |
|
|
481 int j = 0; |
|
|
482 int i = 0; |
|
|
483 for (i = 0; i < key_len; i++) |
|
|
484 list[j++] = key[i]; |
|
|
485 |
|
|
486 for (i = 0; i < glb_len; i++) |
|
|
487 list[j++] = glb[i]; |
|
|
488 |
|
|
489 for (i = 0; i < top_len; i++) |
|
|
490 list[j++] = top[i]; |
|
|
491 |
|
|
492 for (i = 0; i < lcl_len; i++) |
|
|
493 list[j++] = lcl[i]; |
|
|
494 |
|
|
495 for (i = 0; i < mfl_len; i++) |
|
|
496 list[j++] = mfl[i]; |
|
|
497 |
|
|
498 list[j] = (char *) NULL; |
|
|
499 |
|
|
500 delete [] key; |
|
|
501 delete [] glb; |
|
|
502 delete [] top; |
|
|
503 delete [] lcl; |
|
|
504 delete [] mfl; |
|
|
505 |
|
|
506 return list; |
|
|
507 } |
|
|
508 |
|
|
509 /* |
|
|
510 ;;; Local Variables: *** |
|
|
511 ;;; mode: C++ *** |
|
|
512 ;;; page-delimiter: "^/\\*" *** |
|
|
513 ;;; End: *** |
|
|
514 */ |
