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)
64 /* FIXME: we shouldn't do this here, but I'm afraid that other
65 code will check the class of vfm_source. */
66 vfm_source = create_case_source (&input_program_source_class,
69 return lex_end_of_command ();
73 cmd_end_input_program (void)
75 struct input_program_pgm *inp;
78 if (!case_source_is_class (vfm_source, &input_program_source_class))
80 msg (SE, _("No matching INPUT PROGRAM command."));
84 if (dict_get_next_value_idx (default_dict) == 0)
85 msg (SW, _("No data-input or transformation commands specified "
86 "between INPUT PROGRAM and END INPUT PROGRAM."));
88 /* Mark the boundary between INPUT PROGRAM transformations and
89 ordinary transformations. */
92 /* Figure out how to initialize each input case. */
93 inp = xmalloc (sizeof *inp);
94 inp->init_cnt = dict_get_next_value_idx (default_dict);
95 inp->init = xmalloc (inp->init_cnt * sizeof *inp->init);
96 for (i = 0; i < inp->init_cnt; i++)
98 for (i = 0; i < dict_get_var_cnt (default_dict); i++)
100 struct variable *var = dict_get_var (default_dict, i);
101 enum value_init_type value_init;
104 value_init = var->type == NUMERIC ? INP_NUMERIC : INP_STRING;
105 value_init |= var->reinit ? INP_REINIT : INP_INIT_ONCE;
107 for (j = 0; j < var->nv; j++)
108 inp->init[j + var->fv] = value_init;
110 for (i = 0; i < inp->init_cnt; i++)
111 assert (inp->init[i] != -1);
112 inp->case_size = dict_get_case_size (default_dict);
114 /* Put inp into vfm_source for later use. */
115 vfm_source->aux = inp;
117 /* FIXME: we should use create_case_source() here. */
118 vfm_source->value_cnt = dict_get_next_value_idx (default_dict);
120 return lex_end_of_command ();
123 /* Initializes case C. Called before the first case is read. */
125 init_case (const struct input_program_pgm *inp, struct ccase *c)
129 for (i = 0; i < inp->init_cnt; i++)
130 switch (inp->init[i])
132 case INP_NUMERIC | INP_INIT_ONCE:
135 case INP_NUMERIC | INP_REINIT:
136 c->data[i].f = SYSMIS;
138 case INP_STRING | INP_INIT_ONCE:
139 case INP_STRING | INP_REINIT:
140 memset (c->data[i].s, ' ', sizeof c->data[i].s);
147 /* Clears case C. Called between reading successive records. */
149 clear_case (const struct input_program_pgm *inp, struct ccase *c)
153 for (i = 0; i < inp->init_cnt; i++)
154 switch (inp->init[i])
156 case INP_NUMERIC | INP_INIT_ONCE:
158 case INP_NUMERIC | INP_REINIT:
159 c->data[i].f = SYSMIS;
161 case INP_STRING | INP_INIT_ONCE:
163 case INP_STRING | INP_REINIT:
164 memset (c->data[i].s, ' ', sizeof c->data[i].s);
171 /* Executes each transformation in turn on a `blank' case. When a
172 transformation fails, returning -2, then that's the end of the
173 file. -1 means go on to the next transformation. Otherwise the
174 return value is the index of the transformation to go to next. */
176 input_program_source_read (struct case_source *source,
178 write_case_func *write_case,
179 write_case_data wc_data)
181 struct input_program_pgm *inp = source->aux;
184 /* Nonzero if there were any END CASE commands in the set of
185 transformations. If so, we don't automatically write out
189 /* FIXME? This is the number of cases sent out of the input
190 program, not the number of cases written to the procedure.
191 The difference should only show up in $CASENUM in COMPUTE.
192 We should check behavior against SPSS. */
193 int cases_written = 0;
195 assert (inp != NULL);
197 /* Figure end_case. */
198 for (i = 0; i < f_trns; i++)
199 if (t_trns[i]->proc == end_case_trns_proc)
202 /* FIXME: This is an ugly kluge. */
203 for (i = 0; i < f_trns; i++)
204 if (t_trns[i]->proc == repeating_data_trns_proc)
205 repeating_data_set_write_case (t_trns[i], write_case, wc_data);
210 /* Perform transformations on `blank' case. */
211 for (i = 0; i < f_trns; )
213 int code; /* Return value of last-called transformation. */
215 if (t_trns[i]->proc == end_case_trns_proc)
218 if (!write_case (wc_data))
225 code = t_trns[i]->proc (t_trns[i], c, cases_written + 1);
241 /* Write the case if appropriate. */
245 if (!write_case (wc_data))
249 /* Blank out the case for the next iteration. */
256 /* Destroys an INPUT PROGRAM source. */
258 input_program_source_destroy (struct case_source *source)
260 struct input_program_pgm *inp = source->aux;
262 cancel_transformations ();
271 const struct case_source_class input_program_source_class =
275 input_program_source_read,
276 input_program_source_destroy,
282 struct trns_header *t;
284 if (!case_source_is_class (vfm_source, &input_program_source_class))
286 msg (SE, _("This command may only be executed between INPUT PROGRAM "
287 "and END INPUT PROGRAM."));
291 t = xmalloc (sizeof *t);
292 t->proc = end_case_trns_proc;
294 add_transformation ((struct trns_header *) t);
296 return lex_end_of_command ();
299 /* Should never be called, because this is handled in
300 input_program_source_read(). */
302 end_case_trns_proc (struct trns_header *t UNUSED, struct ccase * c UNUSED,
308 /* REREAD transformation. */
311 struct trns_header h;
313 struct file_handle *handle; /* File to move file pointer back on. */
314 struct expression *column; /* Column to reset file pointer to. */
317 /* Parses REREAD command. */
321 /* File to be re-read. */
322 struct file_handle *h;
324 /* Expression for column to set file pointer to. */
325 struct expression *e;
327 /* Created transformation. */
328 struct reread_trns *t;
334 if (lex_match_id ("COLUMN"))
340 msg (SE, _("COLUMN subcommand multiply specified."));
345 e = expr_parse (PXP_NUMERIC);
349 else if (lex_match_id ("FILE"))
352 h = fh_parse_file_handle ();
367 t = xmalloc (sizeof *t);
368 t->h.proc = reread_trns_proc;
369 t->h.free = reread_trns_free;
372 add_transformation ((struct trns_header *) t);
377 /* Executes a REREAD transformation. */
379 reread_trns_proc (struct trns_header * pt, struct ccase * c,
382 struct reread_trns *t = (struct reread_trns *) pt;
384 if (t->column == NULL)
385 dfm_bkwd_record (t->handle, 1);
390 expr_evaluate (t->column, c, case_num, &column);
391 if (!finite (column.f) || column.f < 1)
393 msg (SE, _("REREAD: Column numbers must be positive finite "
394 "numbers. Column set to 1."));
395 dfm_bkwd_record (t->handle, 1);
398 dfm_bkwd_record (t->handle, column.f);
403 /* Frees a REREAD transformation. */
405 reread_trns_free (struct trns_header * t)
407 expr_free (((struct reread_trns *) t)->column);
410 /* Parses END FILE command. */
414 struct trns_header *t;
416 if (!case_source_is_class (vfm_source, &input_program_source_class))
418 msg (SE, _("This command may only be executed between INPUT PROGRAM "
419 "and END INPUT PROGRAM."));
423 t = xmalloc (sizeof *t);
424 t->proc = end_file_trns_proc;
426 add_transformation ((struct trns_header *) t);
428 return lex_end_of_command ();
431 /* Executes an END FILE transformation. */
433 end_file_trns_proc (struct trns_header * t UNUSED, struct ccase * c UNUSED,