1 /* PSPP - computes sample statistics.
2 Copyright (C) 1997-9, 2000 Free Software Foundation, Inc.
3 Written by Ben Pfaff <blp@gnu.org>.
5 This program is free software; you can redistribute it and/or
6 modify it under the terms of the GNU General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
10 This program is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
26 #include "data-list.h"
30 #include "file-handle.h"
37 #include "debug-print.h"
39 /* Indicates how a `union value' should be initialized. */
42 INP_NUMERIC = 01, /* Numeric. */
43 INP_STRING = 0, /* String. */
45 INP_INIT_ONCE = 02, /* Initialize only once. */
46 INP_REINIT = 0, /* Reinitialize for each iteration. */
49 struct input_program_pgm
51 enum value_init_type *init; /* How to initialize each `union value'. */
52 size_t init_cnt; /* Number of elements in inp_init. */
53 size_t case_size; /* Size of case in bytes. */
56 static trns_proc_func end_case_trns_proc, reread_trns_proc, end_file_trns_proc;
57 static trns_free_func reread_trns_free;
60 cmd_input_program (void)
62 lex_match_id ("INPUT");
63 lex_match_id ("PROGRAM");
66 /* FIXME: we shouldn't do this here, but I'm afraid that other
67 code will check the class of vfm_source. */
68 vfm_source = create_case_source (&input_program_source_class,
71 return lex_end_of_command ();
75 cmd_end_input_program (void)
77 struct input_program_pgm *inp;
81 lex_match_id ("INPUT");
82 lex_match_id ("PROGRAM");
84 if (!case_source_is_class (vfm_source, &input_program_source_class))
86 msg (SE, _("No matching INPUT PROGRAM command."));
90 if (dict_get_next_value_idx (default_dict) == 0)
91 msg (SW, _("No data-input or transformation commands specified "
92 "between INPUT PROGRAM and END INPUT PROGRAM."));
94 /* Mark the boundary between INPUT PROGRAM transformations and
95 ordinary transformations. */
98 /* Figure out how to initialize each input case. */
99 inp = xmalloc (sizeof *inp);
100 inp->init_cnt = dict_get_next_value_idx (default_dict);
101 inp->init = xmalloc (inp->init_cnt * sizeof *inp->init);
102 for (i = 0; i < inp->init_cnt; i++)
104 for (i = 0; i < dict_get_var_cnt (default_dict); i++)
106 struct variable *var = dict_get_var (default_dict, i);
107 enum value_init_type value_init;
110 value_init = var->type == NUMERIC ? INP_NUMERIC : INP_STRING;
111 value_init |= var->reinit ? INP_REINIT : INP_INIT_ONCE;
113 for (j = 0; j < var->nv; j++)
114 inp->init[j + var->fv] = value_init;
116 for (i = 0; i < inp->init_cnt; i++)
117 assert (inp->init[i] != -1);
118 inp->case_size = dict_get_case_size (default_dict);
120 /* Put inp into vfm_source for later use. */
121 vfm_source->aux = inp;
123 /* FIXME: we should use create_case_source() here. */
124 vfm_source->value_cnt = dict_get_next_value_idx (default_dict);
126 return lex_end_of_command ();
129 /* Initializes case C. Called before the first case is read. */
131 init_case (const struct input_program_pgm *inp, struct ccase *c)
135 for (i = 0; i < inp->init_cnt; i++)
136 switch (inp->init[i])
138 case INP_NUMERIC | INP_INIT_ONCE:
141 case INP_NUMERIC | INP_REINIT:
142 c->data[i].f = SYSMIS;
144 case INP_STRING | INP_INIT_ONCE:
145 case INP_STRING | INP_REINIT:
146 memset (c->data[i].s, ' ', sizeof c->data[i].s);
153 /* Clears case C. Called between reading successive records. */
155 clear_case (const struct input_program_pgm *inp, struct ccase *c)
159 for (i = 0; i < inp->init_cnt; i++)
160 switch (inp->init[i])
162 case INP_NUMERIC | INP_INIT_ONCE:
164 case INP_NUMERIC | INP_REINIT:
165 c->data[i].f = SYSMIS;
167 case INP_STRING | INP_INIT_ONCE:
169 case INP_STRING | INP_REINIT:
170 memset (c->data[i].s, ' ', sizeof c->data[i].s);
177 /* Executes each transformation in turn on a `blank' case. When a
178 transformation fails, returning -2, then that's the end of the
179 file. -1 means go on to the next transformation. Otherwise the
180 return value is the index of the transformation to go to next. */
182 input_program_source_read (struct case_source *source,
184 write_case_func *write_case,
185 write_case_data wc_data)
187 struct input_program_pgm *inp = source->aux;
190 /* Nonzero if there were any END CASE commands in the set of
191 transformations. If so, we don't automatically write out
195 /* FIXME? This is the number of cases sent out of the input
196 program, not the number of cases written to the procedure.
197 The difference should only show up in $CASENUM in COMPUTE.
198 We should check behavior against SPSS. */
199 int cases_written = 0;
201 assert (inp != NULL);
203 /* Figure end_case. */
204 for (i = 0; i < f_trns; i++)
205 if (t_trns[i]->proc == end_case_trns_proc)
208 /* FIXME: This is an ugly kluge. */
209 for (i = 0; i < f_trns; i++)
210 if (t_trns[i]->proc == repeating_data_trns_proc)
211 repeating_data_set_write_case (t_trns[i], write_case, wc_data);
216 /* Perform transformations on `blank' case. */
217 for (i = 0; i < f_trns; )
219 int code; /* Return value of last-called transformation. */
221 if (t_trns[i]->proc == end_case_trns_proc)
224 if (!write_case (wc_data))
231 code = t_trns[i]->proc (t_trns[i], c, cases_written + 1);
247 /* Write the case if appropriate. */
251 if (!write_case (wc_data))
255 /* Blank out the case for the next iteration. */
262 /* Destroys an INPUT PROGRAM source. */
264 input_program_source_destroy (struct case_source *source)
266 struct input_program_pgm *inp = source->aux;
268 cancel_transformations ();
277 const struct case_source_class input_program_source_class =
281 input_program_source_read,
282 input_program_source_destroy,
288 struct trns_header *t;
290 lex_match_id ("END");
291 lex_match_id ("CASE");
293 if (!case_source_is_class (vfm_source, &input_program_source_class))
295 msg (SE, _("This command may only be executed between INPUT PROGRAM "
296 "and END INPUT PROGRAM."));
300 t = xmalloc (sizeof *t);
301 t->proc = end_case_trns_proc;
303 add_transformation ((struct trns_header *) t);
305 return lex_end_of_command ();
308 /* Should never be called, because this is handled in
309 input_program_source_read(). */
311 end_case_trns_proc (struct trns_header *t UNUSED, struct ccase * c UNUSED,
317 /* REREAD transformation. */
320 struct trns_header h;
322 struct file_handle *handle; /* File to move file pointer back on. */
323 struct expression *column; /* Column to reset file pointer to. */
326 /* Parses REREAD command. */
330 /* File to be re-read. */
331 struct file_handle *h;
333 /* Expression for column to set file pointer to. */
334 struct expression *e;
336 /* Created transformation. */
337 struct reread_trns *t;
339 lex_match_id ("REREAD");
345 if (lex_match_id ("COLUMN"))
351 msg (SE, _("COLUMN subcommand multiply specified."));
356 e = expr_parse (PXP_NUMERIC);
360 else if (lex_match_id ("FILE"))
365 lex_error (_("expecting file handle name"));
369 h = fh_get_handle_by_name (tokid);
384 t = xmalloc (sizeof *t);
385 t->h.proc = reread_trns_proc;
386 t->h.free = reread_trns_free;
389 add_transformation ((struct trns_header *) t);
394 /* Executes a REREAD transformation. */
396 reread_trns_proc (struct trns_header * pt, struct ccase * c,
399 struct reread_trns *t = (struct reread_trns *) pt;
401 if (t->column == NULL)
402 dfm_bkwd_record (t->handle, 1);
407 expr_evaluate (t->column, c, case_num, &column);
408 if (!finite (column.f) || column.f < 1)
410 msg (SE, _("REREAD: Column numbers must be positive finite "
411 "numbers. Column set to 1."));
412 dfm_bkwd_record (t->handle, 1);
415 dfm_bkwd_record (t->handle, column.f);
420 /* Frees a REREAD transformation. */
422 reread_trns_free (struct trns_header * t)
424 expr_free (((struct reread_trns *) t)->column);
427 /* Parses END FILE command. */
431 struct trns_header *t;
433 lex_match_id ("END");
434 lex_match_id ("FILE");
436 if (!case_source_is_class (vfm_source, &input_program_source_class))
438 msg (SE, _("This command may only be executed between INPUT PROGRAM "
439 "and END INPUT PROGRAM."));
443 t = xmalloc (sizeof *t);
444 t->proc = end_file_trns_proc;
446 add_transformation ((struct trns_header *) t);
448 return lex_end_of_command ();
451 /* Executes an END FILE transformation. */
453 end_file_trns_proc (struct trns_header * t UNUSED, struct ccase * c UNUSED,