1 /* PSPP - a program for statistical analysis.
2 Copyright (C) 1997-9, 2000 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/>. */
19 #include <language/data-io/inpt-pgm.h>
24 #include <data/case.h>
25 #include <data/caseinit.h>
26 #include <data/casereader-provider.h>
27 #include <data/dictionary.h>
28 #include <data/procedure.h>
29 #include <data/transformations.h>
30 #include <data/variable.h>
31 #include <language/command.h>
32 #include <language/data-io/data-reader.h>
33 #include <language/data-io/file-handle.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/message.h>
40 #include <libpspp/misc.h>
41 #include <libpspp/str.h>
46 #define _(msgid) gettext (msgid)
48 /* Private result codes for use within INPUT PROGRAM. */
49 enum cmd_result_extensions
51 CMD_END_INPUT_PROGRAM = CMD_PRIVATE_FIRST,
55 /* Indicates how a `union value' should be initialized. */
58 INP_NUMERIC = 01, /* Numeric. */
59 INP_STRING = 0, /* String. */
61 INP_INIT_ONCE = 02, /* Initialize only once. */
62 INP_REINIT = 0, /* Reinitialize for each iteration. */
65 struct input_program_pgm
67 struct trns_chain *trns_chain;
68 enum trns_result restart;
70 casenumber case_nr; /* Incremented by END CASE transformation. */
72 struct caseinit *init;
76 static void destroy_input_program (struct input_program_pgm *);
77 static trns_proc_func end_case_trns_proc;
78 static trns_proc_func reread_trns_proc;
79 static trns_proc_func end_file_trns_proc;
80 static trns_free_func reread_trns_free;
82 static const struct casereader_class input_program_casereader_class;
84 static bool inside_input_program;
86 /* Returns true if we're parsing the inside of a INPUT
87 PROGRAM...END INPUT PROGRAM construct, false otherwise. */
89 in_input_program (void)
91 return inside_input_program;
94 /* Emits an END CASE transformation for INP. */
96 emit_END_CASE (struct dataset *ds, struct input_program_pgm *inp)
98 add_transformation (ds, end_case_trns_proc, NULL, inp);
102 cmd_input_program (struct lexer *lexer, struct dataset *ds)
104 struct input_program_pgm *inp;
105 bool saw_END_CASE = false;
107 proc_discard_active_file (ds);
108 if (lex_token (lexer) != '.')
109 return lex_end_of_command (lexer);
111 inp = xmalloc (sizeof *inp);
112 inp->trns_chain = NULL;
115 inside_input_program = true;
118 enum cmd_result result = cmd_parse_in_state (lexer, ds, CMD_STATE_INPUT_PROGRAM);
119 if (result == CMD_END_INPUT_PROGRAM)
121 else if (result == CMD_END_CASE)
123 emit_END_CASE (ds, inp);
126 else if (cmd_result_is_failure (result) && result != CMD_FAILURE)
128 if (result == CMD_EOF)
129 msg (SE, _("Unexpected end-of-file within INPUT PROGRAM."));
130 inside_input_program = false;
131 proc_discard_active_file (ds);
132 destroy_input_program (inp);
137 emit_END_CASE (ds, inp);
138 inside_input_program = false;
140 if (dict_get_next_value_idx (dataset_dict (ds)) == 0)
142 msg (SE, _("Input program did not create any variables."));
143 proc_discard_active_file (ds);
144 destroy_input_program (inp);
148 inp->trns_chain = proc_capture_transformations (ds);
149 trns_chain_finalize (inp->trns_chain);
151 inp->restart = TRNS_CONTINUE;
153 /* Figure out how to initialize each input case. */
154 inp->init = caseinit_create ();
155 caseinit_mark_for_init (inp->init, dataset_dict (ds));
156 inp->value_cnt = dict_get_next_value_idx (dataset_dict (ds));
158 proc_set_active_file_data (
159 ds, casereader_create_sequential (NULL, inp->value_cnt, CASENUMBER_MAX,
160 &input_program_casereader_class, inp));
166 cmd_end_input_program (struct lexer *lexer UNUSED, struct dataset *ds UNUSED)
168 assert (in_input_program ());
169 return CMD_END_INPUT_PROGRAM;
172 /* Returns true if STATE is valid given the transformations that
173 are allowed within INPUT PROGRAM. */
175 is_valid_state (enum trns_result state)
177 return (state == TRNS_CONTINUE
178 || state == TRNS_ERROR
179 || state == TRNS_END_FILE
183 /* Reads one case into C.
184 Returns true if successful, false at end of file or if an
185 I/O error occurred. */
187 input_program_casereader_read (struct casereader *reader UNUSED, void *inp_,
190 struct input_program_pgm *inp = inp_;
192 case_create (c, inp->value_cnt);
196 assert (is_valid_state (inp->restart));
197 if (inp->restart == TRNS_ERROR || inp->restart == TRNS_END_FILE)
203 caseinit_init_vars (inp->init, c);
204 inp->restart = trns_chain_execute (inp->trns_chain, inp->restart,
206 assert (is_valid_state (inp->restart));
207 caseinit_update_left_vars (inp->init, c);
209 while (inp->restart < 0);
215 destroy_input_program (struct input_program_pgm *pgm)
219 trns_chain_destroy (pgm->trns_chain);
220 caseinit_destroy (pgm->init);
225 /* Destroys the casereader. */
227 input_program_casereader_destroy (struct casereader *reader UNUSED, void *inp_)
229 struct input_program_pgm *inp = inp_;
230 if (inp->restart == TRNS_ERROR)
231 casereader_force_error (reader);
232 destroy_input_program (inp);
235 static const struct casereader_class input_program_casereader_class =
237 input_program_casereader_read,
238 input_program_casereader_destroy,
244 cmd_end_case (struct lexer *lexer, struct dataset *ds UNUSED)
246 assert (in_input_program ());
247 if (lex_token (lexer) == '.')
249 return lex_end_of_command (lexer);
252 /* Outputs the current case */
254 end_case_trns_proc (void *inp_, struct ccase *c UNUSED,
255 casenumber case_nr UNUSED)
257 struct input_program_pgm *inp = inp_;
259 return TRNS_END_CASE;
262 /* REREAD transformation. */
265 struct dfm_reader *reader; /* File to move file pointer back on. */
266 struct expression *column; /* Column to reset file pointer to. */
269 /* Parses REREAD command. */
271 cmd_reread (struct lexer *lexer, struct dataset *ds)
273 struct file_handle *fh; /* File to be re-read. */
274 struct expression *e; /* Expression for column to set. */
275 struct reread_trns *t; /* Created transformation. */
277 fh = fh_get_default_handle ();
279 while (lex_token (lexer) != '.')
281 if (lex_match_id (lexer, "COLUMN"))
283 lex_match (lexer, '=');
287 msg (SE, _("COLUMN subcommand multiply specified."));
289 return CMD_CASCADING_FAILURE;
292 e = expr_parse (lexer, ds, EXPR_NUMBER);
294 return CMD_CASCADING_FAILURE;
296 else if (lex_match_id (lexer, "FILE"))
298 lex_match (lexer, '=');
300 fh = fh_parse (lexer, FH_REF_FILE | FH_REF_INLINE);
304 return CMD_CASCADING_FAILURE;
309 lex_error (lexer, NULL);
311 return CMD_CASCADING_FAILURE;
315 t = xmalloc (sizeof *t);
316 t->reader = dfm_open_reader (fh, lexer);
318 add_transformation (ds, reread_trns_proc, reread_trns_free, t);
324 /* Executes a REREAD transformation. */
326 reread_trns_proc (void *t_, struct ccase *c, casenumber case_num)
328 struct reread_trns *t = t_;
330 if (t->column == NULL)
331 dfm_reread_record (t->reader, 1);
334 double column = expr_evaluate_num (t->column, c, case_num);
335 if (!isfinite (column) || column < 1)
337 msg (SE, _("REREAD: Column numbers must be positive finite "
338 "numbers. Column set to 1."));
339 dfm_reread_record (t->reader, 1);
342 dfm_reread_record (t->reader, column);
344 return TRNS_CONTINUE;
347 /* Frees a REREAD transformation.
348 Returns true if successful, false if an I/O error occurred. */
350 reread_trns_free (void *t_)
352 struct reread_trns *t = t_;
353 expr_free (t->column);
354 dfm_close_reader (t->reader);
358 /* Parses END FILE command. */
360 cmd_end_file (struct lexer *lexer, struct dataset *ds)
362 assert (in_input_program ());
364 add_transformation (ds, end_file_trns_proc, NULL, NULL);
366 return lex_end_of_command (lexer);
369 /* Executes an END FILE transformation. */
371 end_file_trns_proc (void *trns_ UNUSED, struct ccase *c UNUSED,
372 casenumber case_num UNUSED)
374 return TRNS_END_FILE;