1 /* PSPP - a program for statistical analysis.
2 Copyright (C) 1997-9, 2000, 2009, 2010, 2011, 2014 Free Software Foundation, Inc.
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation, either version 3 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
23 #include "data/case.h"
24 #include "data/dataset.h"
25 #include "data/dictionary.h"
26 #include "data/transformations.h"
27 #include "data/variable.h"
28 #include "data/vector.h"
29 #include "language/command.h"
30 #include "language/expressions/public.h"
31 #include "language/lexer/lexer.h"
32 #include "libpspp/message.h"
33 #include "libpspp/misc.h"
34 #include "libpspp/str.h"
36 #include "gl/xalloc.h"
39 #define _(msgid) gettext (msgid)
44 /* COMPUTE or IF target variable or vector element.
45 For a variable, the `variable' member is non-null.
46 For a vector element, the `vector' member is non-null. */
49 struct variable *variable; /* Destination variable. */
50 bool is_new_variable; /* Did we create the variable? */
52 const struct vector *vector; /* Destination vector, if any, or NULL. */
53 struct expression *element; /* Destination vector element, or NULL. */
56 /* Target of a COMPUTE or IF assignment, either a variable or a
58 static struct lvalue *lvalue_parse (struct lexer *lexer, struct dataset *);
59 static int lvalue_get_type (const struct lvalue *);
60 static bool lvalue_is_vector (const struct lvalue *);
61 static void lvalue_finalize (struct lvalue *,
62 struct compute_trns *, struct dictionary *);
63 static void lvalue_destroy (struct lvalue *, struct dictionary *);
65 /* COMPUTE and IF transformation. */
68 /* Test expression (IF only). */
69 struct expression *test; /* Test expression. */
71 /* Variable lvalue, if variable != NULL. */
72 struct variable *variable; /* Destination variable, if any. */
73 int width; /* Lvalue string width; 0=numeric. */
75 /* Vector lvalue, if vector != NULL. */
76 const struct vector *vector; /* Destination vector, if any. */
77 struct expression *element; /* Destination vector element expr. */
80 struct expression *rvalue; /* Rvalue expression. */
83 static struct expression *parse_rvalue (struct lexer *lexer,
84 const struct lvalue *,
87 static struct compute_trns *compute_trns_create (void);
88 static bool compute_trns_free (void *compute_);
89 static const struct trns_class *get_trns_class (const struct lvalue *);
94 cmd_compute (struct lexer *lexer, struct dataset *ds)
96 struct dictionary *dict = dataset_dict (ds);
97 struct lvalue *lvalue = NULL;
98 struct compute_trns *compute = NULL;
100 compute = compute_trns_create ();
102 lvalue = lvalue_parse (lexer, ds);
106 if (!lex_force_match (lexer, T_EQUALS))
108 compute->rvalue = parse_rvalue (lexer, lvalue, ds);
109 if (compute->rvalue == NULL)
112 add_transformation (ds, get_trns_class (lvalue), compute);
114 lvalue_finalize (lvalue, compute, dict);
119 lvalue_destroy (lvalue, dict);
120 compute_trns_free (compute);
121 return CMD_CASCADING_FAILURE;
124 /* Transformation functions. */
126 /* Handle COMPUTE or IF with numeric target variable. */
127 static enum trns_result
128 compute_num (void *compute_, struct ccase **c, casenumber case_num)
130 struct compute_trns *compute = compute_;
132 printf ("compute\n");
133 if (compute->test == NULL
134 || expr_evaluate_num (compute->test, *c, case_num) == 1.0)
136 *c = case_unshare (*c);
137 *case_num_rw (*c, compute->variable)
138 = expr_evaluate_num (compute->rvalue, *c, case_num);
141 return TRNS_CONTINUE;
144 /* Handle COMPUTE or IF with numeric vector element target
146 static enum trns_result
147 compute_num_vec (void *compute_, struct ccase **c, casenumber case_num)
149 struct compute_trns *compute = compute_;
151 if (compute->test == NULL
152 || expr_evaluate_num (compute->test, *c, case_num) == 1.0)
154 double index; /* Index into the vector. */
155 int rindx; /* Rounded index value. */
157 index = expr_evaluate_num (compute->element, *c, case_num);
158 rindx = floor (index + EPSILON);
160 || rindx < 1 || rindx > vector_get_n_vars (compute->vector))
163 msg (SW, _("When executing COMPUTE: SYSMIS is not a valid value "
164 "as an index into vector %s."),
165 vector_get_name (compute->vector));
167 msg (SW, _("When executing COMPUTE: %.*g is not a valid value as "
168 "an index into vector %s."),
169 DBL_DIG + 1, index, vector_get_name (compute->vector));
170 return TRNS_CONTINUE;
173 *c = case_unshare (*c);
174 *case_num_rw (*c, vector_get_var (compute->vector, rindx - 1))
175 = expr_evaluate_num (compute->rvalue, *c, case_num);
178 return TRNS_CONTINUE;
181 /* Handle COMPUTE or IF with string target variable. */
182 static enum trns_result
183 compute_str (void *compute_, struct ccase **c, casenumber case_num)
185 struct compute_trns *compute = compute_;
187 if (compute->test == NULL
188 || expr_evaluate_num (compute->test, *c, case_num) == 1.0)
192 *c = case_unshare (*c);
193 s = CHAR_CAST_BUG (char *, case_str_rw (*c, compute->variable));
194 expr_evaluate_str (compute->rvalue, *c, case_num, s, compute->width);
197 return TRNS_CONTINUE;
200 /* Handle COMPUTE or IF with string vector element target
202 static enum trns_result
203 compute_str_vec (void *compute_, struct ccase **c, casenumber case_num)
205 struct compute_trns *compute = compute_;
207 if (compute->test == NULL
208 || expr_evaluate_num (compute->test, *c, case_num) == 1.0)
210 double index; /* Index into the vector. */
211 int rindx; /* Rounded index value. */
212 struct variable *vr; /* Variable reference by indexed vector. */
214 index = expr_evaluate_num (compute->element, *c, case_num);
215 rindx = floor (index + EPSILON);
218 msg (SW, _("When executing COMPUTE: SYSMIS is not a valid "
219 "value as an index into vector %s."),
220 vector_get_name (compute->vector));
221 return TRNS_CONTINUE;
223 else if (rindx < 1 || rindx > vector_get_n_vars (compute->vector))
225 msg (SW, _("When executing COMPUTE: %.*g is not a valid value as "
226 "an index into vector %s."),
227 DBL_DIG + 1, index, vector_get_name (compute->vector));
228 return TRNS_CONTINUE;
231 vr = vector_get_var (compute->vector, rindx - 1);
232 *c = case_unshare (*c);
233 expr_evaluate_str (compute->rvalue, *c, case_num,
234 CHAR_CAST_BUG (char *, case_str_rw (*c, vr)),
238 return TRNS_CONTINUE;
244 cmd_if (struct lexer *lexer, struct dataset *ds)
246 struct dictionary *dict = dataset_dict (ds);
247 struct compute_trns *compute = NULL;
248 struct lvalue *lvalue = NULL;
250 compute = compute_trns_create ();
252 /* Test expression. */
253 compute->test = expr_parse_bool (lexer, ds);
254 if (compute->test == NULL)
257 /* Lvalue variable. */
258 lvalue = lvalue_parse (lexer, ds);
262 /* Rvalue expression. */
263 if (!lex_force_match (lexer, T_EQUALS))
265 compute->rvalue = parse_rvalue (lexer, lvalue, ds);
266 if (compute->rvalue == NULL)
269 add_transformation (ds, get_trns_class (lvalue), compute);
271 lvalue_finalize (lvalue, compute, dict);
276 lvalue_destroy (lvalue, dict);
277 compute_trns_free (compute);
278 return CMD_CASCADING_FAILURE;
281 /* Code common to COMPUTE and IF. */
283 static const struct trns_class *
284 get_trns_class (const struct lvalue *lvalue)
286 static const struct trns_class classes[2][2] = {
289 .execute = compute_str,
290 .destroy = compute_trns_free
294 .execute = compute_str_vec,
295 .destroy = compute_trns_free
299 .execute = compute_num,
300 .destroy = compute_trns_free
304 .execute = compute_num_vec,
305 .destroy = compute_trns_free
309 bool is_numeric = lvalue_get_type (lvalue) == VAL_NUMERIC;
310 bool is_vector = lvalue_is_vector (lvalue);
311 return &classes[is_numeric][is_vector];
314 /* Parses and returns an rvalue expression of the same type as
315 LVALUE, or a null pointer on failure. */
316 static struct expression *
317 parse_rvalue (struct lexer *lexer,
318 const struct lvalue *lvalue, struct dataset *ds)
320 if (lvalue->is_new_variable)
321 return expr_parse_new_variable (lexer, ds, var_get_name (lvalue->variable));
323 return expr_parse (lexer, ds, lvalue_get_type (lvalue));
326 /* Returns a new struct compute_trns after initializing its fields. */
327 static struct compute_trns *
328 compute_trns_create (void)
330 struct compute_trns *compute = xmalloc (sizeof *compute);
331 compute->test = NULL;
332 compute->variable = NULL;
333 compute->vector = NULL;
334 compute->element = NULL;
335 compute->rvalue = NULL;
339 /* Deletes all the fields in COMPUTE. */
341 compute_trns_free (void *compute_)
343 struct compute_trns *compute = compute_;
347 expr_free (compute->test);
348 expr_free (compute->element);
349 expr_free (compute->rvalue);
355 /* Parses the target variable or vector element into a new
356 `struct lvalue', which is returned. */
357 static struct lvalue *
358 lvalue_parse (struct lexer *lexer, struct dataset *ds)
360 struct dictionary *dict = dataset_dict (ds);
361 struct lvalue *lvalue;
363 lvalue = xmalloc (sizeof *lvalue);
364 lvalue->variable = NULL;
365 lvalue->is_new_variable = false;
366 lvalue->vector = NULL;
367 lvalue->element = NULL;
369 if (!lex_force_id (lexer))
372 if (lex_next_token (lexer, 1) == T_LPAREN)
375 lvalue->vector = dict_lookup_vector (dict, lex_tokcstr (lexer));
376 if (lvalue->vector == NULL)
378 msg (SE, _("There is no vector named %s."), lex_tokcstr (lexer));
382 /* Vector element. */
384 if (!lex_force_match (lexer, T_LPAREN))
386 lvalue->element = expr_parse (lexer, ds, VAL_NUMERIC);
387 if (lvalue->element == NULL)
389 if (!lex_force_match (lexer, T_RPAREN))
395 const char *var_name = lex_tokcstr (lexer);
396 lvalue->variable = dict_lookup_var (dict, var_name);
397 if (lvalue->variable == NULL)
399 lvalue->variable = dict_create_var_assert (dict, var_name, 0);
400 lvalue->is_new_variable = true;
407 lvalue_destroy (lvalue, dict);
411 /* Returns the type (NUMERIC or ALPHA) of the target variable or
414 lvalue_get_type (const struct lvalue *lvalue)
416 return (lvalue->variable != NULL
417 ? var_get_type (lvalue->variable)
418 : vector_get_type (lvalue->vector));
421 /* Returns true if LVALUE has a vector as its target. */
423 lvalue_is_vector (const struct lvalue *lvalue)
425 return lvalue->vector != NULL;
428 /* Finalizes making LVALUE the target of COMPUTE, by creating the
429 target variable if necessary and setting fields in COMPUTE. */
431 lvalue_finalize (struct lvalue *lvalue,
432 struct compute_trns *compute,
433 struct dictionary *dict)
435 if (lvalue->vector == NULL)
437 compute->variable = lvalue->variable;
438 compute->width = var_get_width (compute->variable);
440 /* Goofy behavior, but compatible: Turn off LEAVE. */
441 if (!var_must_leave (compute->variable))
442 var_set_leave (compute->variable, false);
444 /* Prevent lvalue_destroy from deleting variable. */
445 lvalue->is_new_variable = false;
449 compute->vector = lvalue->vector;
450 compute->element = lvalue->element;
451 lvalue->element = NULL;
454 lvalue_destroy (lvalue, dict);
457 /* Destroys LVALUE. */
459 lvalue_destroy (struct lvalue *lvalue, struct dictionary *dict)
464 if (lvalue->is_new_variable)
465 dict_delete_var (dict, lvalue->variable);
466 expr_free (lvalue->element);