1 /* PSPP - a program for statistical analysis.
2 Copyright (C) 1997-9, 2000, 2009, 2010, 2011, 2012, 2013 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/>. */
22 #include "data/case.h"
23 #include "data/caseinit.h"
24 #include "data/casereader-provider.h"
25 #include "data/dataset.h"
26 #include "data/dictionary.h"
27 #include "data/session.h"
28 #include "data/transformations.h"
29 #include "data/variable.h"
30 #include "language/command.h"
31 #include "language/data-io/data-reader.h"
32 #include "language/data-io/file-handle.h"
33 #include "language/data-io/inpt-pgm.h"
34 #include "language/expressions/public.h"
35 #include "language/lexer/lexer.h"
36 #include "libpspp/assertion.h"
37 #include "libpspp/compiler.h"
38 #include "libpspp/message.h"
39 #include "libpspp/misc.h"
40 #include "libpspp/str.h"
42 #include "gl/xalloc.h"
45 #define _(msgid) gettext (msgid)
47 /* Indicates how a `union value' should be initialized. */
48 struct input_program_pgm
50 struct session *session;
53 struct trns_chain xforms;
57 casenumber case_nr; /* Incremented by END CASE transformation. */
59 struct caseinit *init;
60 struct caseproto *proto;
63 static void destroy_input_program (struct input_program_pgm *);
64 static const struct trns_class end_case_trns_class;
65 static const struct trns_class reread_trns_class;
66 static const struct trns_class end_file_trns_class;
68 static const struct casereader_class input_program_casereader_class;
70 static bool inside_input_program;
71 static bool saw_END_CASE;
72 static bool saw_END_FILE;
73 static bool saw_DATA_LIST;
75 /* Returns true if we're parsing the inside of a INPUT
76 PROGRAM...END INPUT PROGRAM construct, false otherwise. */
78 in_input_program (void)
80 return inside_input_program;
83 /* Emits an END CASE transformation for INP. */
85 emit_END_CASE (struct dataset *ds)
87 add_transformation (ds, &end_case_trns_class, NULL);
91 cmd_input_program (struct lexer *lexer, struct dataset *ds)
93 if (!lex_match (lexer, T_ENDCMD))
94 return lex_end_of_command (lexer);
96 struct session *session = session_create (dataset_session (ds));
97 struct dataset *inp_ds = dataset_create (session, "INPUT PROGRAM");
99 struct input_program_pgm *inp = xmalloc (sizeof *inp);
100 *inp = (struct input_program_pgm) { .session = session, .ds = inp_ds };
102 proc_push_transformations (inp->ds);
103 inside_input_program = true;
104 saw_END_CASE = saw_END_FILE = saw_DATA_LIST = false;
105 while (!lex_match_phrase (lexer, "END INPUT PROGRAM"))
107 enum cmd_result result;
109 result = cmd_parse_in_state (lexer, inp->ds, CMD_STATE_INPUT_PROGRAM);
110 if (result != CMD_FAILURE
111 && cmd_result_is_failure (result)
112 && lex_get_error_mode (lexer) != LEX_ERROR_TERMINAL)
114 proc_pop_transformations (ds, &inp->xforms);
116 if (result == CMD_EOF)
117 msg (SE, _("Unexpected end-of-file within %s."), "INPUT PROGRAM");
118 inside_input_program = false;
119 destroy_input_program (inp);
124 emit_END_CASE (inp->ds);
125 inside_input_program = false;
126 proc_pop_transformations (inp->ds, &inp->xforms);
128 if (!saw_DATA_LIST && !saw_END_FILE)
130 msg (SE, _("Input program must contain %s or %s."), "DATA LIST", "END FILE");
131 destroy_input_program (inp);
134 if (dict_get_next_value_idx (dataset_dict (inp->ds)) == 0)
136 msg (SE, _("Input program did not create any variables."));
137 destroy_input_program (inp);
141 /* Figure out how to initialize each input case. */
142 inp->init = caseinit_create ();
143 caseinit_mark_for_init (inp->init, dataset_dict (inp->ds));
144 inp->proto = caseproto_ref (dict_get_proto (dataset_dict (inp->ds)));
146 dataset_set_dict (ds, dict_clone (dataset_dict (inp->ds)));
148 ds, casereader_create_sequential (NULL, inp->proto, CASENUMBER_MAX,
149 &input_program_casereader_class, inp));
154 /* Reads and returns one case.
155 Returns the case if successful, null at end of file or if an
156 I/O error occurred. */
157 static struct ccase *
158 input_program_casereader_read (struct casereader *reader UNUSED, void *inp_)
160 struct input_program_pgm *inp = inp_;
162 if (inp->eof || !inp->xforms.n)
165 struct ccase *c = case_create (inp->proto);
166 caseinit_init_vars (inp->init, c);
168 printf ("%s:%d\n", __FILE__, __LINE__);
169 for (size_t i = inp->idx < inp->xforms.n ? inp->idx : 0; ; i++)
171 printf ("%s:%d %zu\n", __FILE__, __LINE__, i);
172 if (i >= inp->xforms.n)
175 c = case_unshare (c);
176 caseinit_update_left_vars (inp->init, c);
177 caseinit_init_vars (inp->init, c);
180 const struct transformation *trns = &inp->xforms.xforms[i];
181 switch (trns->class->execute (trns->aux, &c, inp->case_nr))
184 printf ("END CASE\n");
191 casereader_force_error (reader);
194 printf ("END FILE\n");
200 printf ("CONTINUE\n");
210 destroy_input_program (struct input_program_pgm *pgm)
214 session_destroy (pgm->session);
215 trns_chain_uninit (&pgm->xforms);
216 caseinit_destroy (pgm->init);
217 caseproto_unref (pgm->proto);
222 /* Destroys the casereader. */
224 input_program_casereader_destroy (struct casereader *reader UNUSED, void *inp_)
226 struct input_program_pgm *inp = inp_;
227 destroy_input_program (inp);
230 static const struct casereader_class input_program_casereader_class =
232 input_program_casereader_read,
233 input_program_casereader_destroy,
239 cmd_end_case (struct lexer *lexer UNUSED, struct dataset *ds)
241 assert (in_input_program ());
247 /* Outputs the current case */
248 static enum trns_result
249 end_case_trns_proc (void *aux UNUSED, struct ccase **c UNUSED,
250 casenumber case_nr UNUSED)
252 printf ("%s:%d\n", __FILE__, __LINE__);
253 return TRNS_END_CASE;
256 static const struct trns_class end_case_trns_class = {
258 .execute = end_case_trns_proc,
261 /* REREAD transformation. */
264 struct dfm_reader *reader; /* File to move file pointer back on. */
265 struct expression *column; /* Column to reset file pointer to. */
268 /* Parses REREAD command. */
270 cmd_reread (struct lexer *lexer, struct dataset *ds)
272 struct file_handle *fh; /* File to be re-read. */
273 struct expression *e; /* Expression for column to set. */
274 struct reread_trns *t; /* Created transformation. */
275 char *encoding = NULL;
277 fh = fh_get_default_handle ();
279 while (lex_token (lexer) != T_ENDCMD)
281 if (lex_match_id (lexer, "COLUMN"))
283 lex_match (lexer, T_EQUALS);
287 lex_sbc_only_once ("COLUMN");
291 e = expr_parse (lexer, ds, VAL_NUMERIC);
295 else if (lex_match_id (lexer, "FILE"))
297 lex_match (lexer, T_EQUALS);
299 fh = fh_parse (lexer, FH_REF_FILE | FH_REF_INLINE, NULL);
303 else if (lex_match_id (lexer, "ENCODING"))
305 lex_match (lexer, T_EQUALS);
306 if (!lex_force_string (lexer))
310 encoding = ss_xstrdup (lex_tokss (lexer));
316 lex_error (lexer, NULL);
321 t = xmalloc (sizeof *t);
322 t->reader = dfm_open_reader (fh, lexer, encoding);
324 add_transformation (ds, &reread_trns_class, t);
333 return CMD_CASCADING_FAILURE;
336 /* Executes a REREAD transformation. */
337 static enum trns_result
338 reread_trns_proc (void *t_, struct ccase **c, casenumber case_num)
340 struct reread_trns *t = t_;
342 if (t->column == NULL)
343 dfm_reread_record (t->reader, 1);
346 double column = expr_evaluate_num (t->column, *c, case_num);
347 if (!isfinite (column) || column < 1)
349 msg (SE, _("REREAD: Column numbers must be positive finite "
350 "numbers. Column set to 1."));
351 dfm_reread_record (t->reader, 1);
354 dfm_reread_record (t->reader, column);
356 return TRNS_CONTINUE;
359 /* Frees a REREAD transformation.
360 Returns true if successful, false if an I/O error occurred. */
362 reread_trns_free (void *t_)
364 struct reread_trns *t = t_;
365 expr_free (t->column);
366 dfm_close_reader (t->reader);
370 static const struct trns_class reread_trns_class = {
372 .execute = reread_trns_proc,
373 .destroy = reread_trns_free,
376 /* Parses END FILE command. */
378 cmd_end_file (struct lexer *lexer UNUSED, struct dataset *ds)
380 assert (in_input_program ());
382 add_transformation (ds, &end_file_trns_class, NULL);
388 /* Executes an END FILE transformation. */
389 static enum trns_result
390 end_file_trns_proc (void *trns_ UNUSED, struct ccase **c UNUSED,
391 casenumber case_num UNUSED)
393 return TRNS_END_FILE;
396 static const struct trns_class end_file_trns_class = {
398 .execute = end_file_trns_proc,