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., 51 Franklin Street, Fifth Floor, Boston, MA
22 #include <language/data-io/inpt-pgm.h>
27 #include <data/case-source.h>
28 #include <data/case.h>
29 #include <data/case-source.h>
30 #include <data/dictionary.h>
31 #include <data/procedure.h>
32 #include <data/transformations.h>
33 #include <data/variable.h>
34 #include <language/command.h>
35 #include <language/data-io/data-reader.h>
36 #include <language/data-io/file-handle.h>
37 #include <language/expressions/public.h>
38 #include <language/lexer/lexer.h>
39 #include <libpspp/alloc.h>
40 #include <libpspp/compiler.h>
41 #include <libpspp/message.h>
42 #include <libpspp/message.h>
43 #include <libpspp/misc.h>
44 #include <libpspp/str.h>
47 #define _(msgid) gettext (msgid)
49 /* Private result codes for use within INPUT PROGRAM. */
50 enum cmd_result_extensions
52 CMD_END_INPUT_PROGRAM = CMD_PRIVATE_FIRST,
56 /* Indicates how a `union value' should be initialized. */
59 INP_NUMERIC = 01, /* Numeric. */
60 INP_STRING = 0, /* String. */
62 INP_INIT_ONCE = 02, /* Initialize only once. */
63 INP_REINIT = 0, /* Reinitialize for each iteration. */
66 struct input_program_pgm
68 struct trns_chain *trns_chain;
70 size_t case_nr; /* Incremented by END CASE transformation. */
71 write_case_func *write_case;/* Called by END CASE. */
72 write_case_data wc_data; /* Aux data used by END CASE. */
74 enum value_init_type *init; /* How to initialize each `union value'. */
75 size_t init_cnt; /* Number of elements in inp_init. */
76 size_t case_size; /* Size of case in bytes. */
79 static void destroy_input_program (struct input_program_pgm *);
80 static trns_proc_func end_case_trns_proc;
81 static trns_proc_func reread_trns_proc;
82 static trns_proc_func end_file_trns_proc;
83 static trns_free_func reread_trns_free;
85 static const struct case_source_class input_program_source_class;
87 static bool inside_input_program;
89 /* Returns true if we're parsing the inside of a INPUT
90 PROGRAM...END INPUT PROGRAM construct, false otherwise. */
92 in_input_program (void)
94 return inside_input_program;
97 /* Emits an END CASE transformation for INP. */
99 emit_END_CASE (struct input_program_pgm *inp)
101 add_transformation (end_case_trns_proc, NULL, inp);
105 cmd_input_program (void)
107 struct input_program_pgm *inp;
109 bool saw_END_CASE = false;
111 discard_variables ();
113 return lex_end_of_command ();
115 inp = xmalloc (sizeof *inp);
116 inp->trns_chain = NULL;
119 inside_input_program = true;
122 enum cmd_result result = cmd_parse (CMD_STATE_INPUT_PROGRAM);
123 if (result == CMD_END_INPUT_PROGRAM)
125 else if (result == CMD_END_CASE)
130 else if (cmd_result_is_failure (result) && result != CMD_FAILURE)
132 if (result == CMD_EOF)
133 msg (SE, _("Unexpected end-of-file within INPUT PROGRAM."));
134 inside_input_program = false;
135 discard_variables ();
136 destroy_input_program (inp);
142 inside_input_program = false;
144 if (dict_get_next_value_idx (default_dict) == 0)
146 msg (SE, _("Input program did not create any variables."));
147 discard_variables ();
148 destroy_input_program (inp);
152 inp->trns_chain = proc_capture_transformations ();
153 trns_chain_finalize (inp->trns_chain);
155 /* Figure out how to initialize each input case. */
156 inp->init_cnt = dict_get_next_value_idx (default_dict);
157 inp->init = xnmalloc (inp->init_cnt, sizeof *inp->init);
158 for (i = 0; i < inp->init_cnt; i++)
160 for (i = 0; i < dict_get_var_cnt (default_dict); i++)
162 struct variable *var = dict_get_var (default_dict, i);
163 enum value_init_type value_init;
166 value_init = var->type == NUMERIC ? INP_NUMERIC : INP_STRING;
167 value_init |= var->leave ? INP_INIT_ONCE : INP_REINIT;
169 for (j = 0; j < var->nv; j++)
170 inp->init[j + var->fv] = value_init;
172 for (i = 0; i < inp->init_cnt; i++)
173 assert (inp->init[i] != -1);
174 inp->case_size = dict_get_case_size (default_dict);
176 proc_set_source (create_case_source (&input_program_source_class, inp));
182 cmd_end_input_program (void)
184 assert (in_input_program ());
185 return CMD_END_INPUT_PROGRAM;
188 /* Initializes case C. Called before the first case is read. */
190 init_case (const struct input_program_pgm *inp, struct ccase *c)
194 for (i = 0; i < inp->init_cnt; i++)
195 switch (inp->init[i])
197 case INP_NUMERIC | INP_INIT_ONCE:
198 case_data_rw (c, i)->f = 0.0;
200 case INP_NUMERIC | INP_REINIT:
201 case_data_rw (c, i)->f = SYSMIS;
203 case INP_STRING | INP_INIT_ONCE:
204 case INP_STRING | INP_REINIT:
205 memset (case_data_rw (c, i)->s, ' ', sizeof case_data_rw (c, i)->s);
212 /* Clears case C. Called between reading successive records. */
214 clear_case (const struct input_program_pgm *inp, struct ccase *c)
218 for (i = 0; i < inp->init_cnt; i++)
219 switch (inp->init[i])
221 case INP_NUMERIC | INP_INIT_ONCE:
223 case INP_NUMERIC | INP_REINIT:
224 case_data_rw (c, i)->f = SYSMIS;
226 case INP_STRING | INP_INIT_ONCE:
228 case INP_STRING | INP_REINIT:
229 memset (case_data_rw (c, i)->s, ' ', sizeof case_data_rw (c, i)->s);
236 /* Executes each transformation in turn on a `blank' case.
237 Returns true if successful, false if an I/O error occurred. */
239 input_program_source_read (struct case_source *source,
241 write_case_func *write_case,
242 write_case_data wc_data)
244 struct input_program_pgm *inp = source->aux;
247 inp->write_case = write_case;
248 inp->wc_data = wc_data;
249 for (init_case (inp, c); ; clear_case (inp, c))
251 enum trns_result result = trns_chain_execute (inp->trns_chain, c,
253 if (result == TRNS_ERROR)
255 else if (result == TRNS_END_FILE)
261 destroy_input_program (struct input_program_pgm *pgm)
265 trns_chain_destroy (pgm->trns_chain);
271 /* Destroys an INPUT PROGRAM source. */
273 input_program_source_destroy (struct case_source *source)
275 struct input_program_pgm *inp = source->aux;
277 destroy_input_program (inp);
280 static const struct case_source_class input_program_source_class =
284 input_program_source_read,
285 input_program_source_destroy,
291 assert (in_input_program ());
294 return lex_end_of_command ();
297 /* Sends the current case as the source's output. */
299 end_case_trns_proc (void *inp_, struct ccase *c, int case_nr UNUSED)
301 struct input_program_pgm *inp = inp_;
303 if (!inp->write_case (inp->wc_data))
308 return TRNS_CONTINUE;
311 /* REREAD transformation. */
314 struct dfm_reader *reader; /* File to move file pointer back on. */
315 struct expression *column; /* Column to reset file pointer to. */
318 /* Parses REREAD command. */
322 struct file_handle *fh; /* File to be re-read. */
323 struct expression *e; /* Expression for column to set. */
324 struct reread_trns *t; /* Created transformation. */
326 fh = fh_get_default_handle ();
330 if (lex_match_id ("COLUMN"))
336 msg (SE, _("COLUMN subcommand multiply specified."));
338 return CMD_CASCADING_FAILURE;
341 e = expr_parse (default_dict, EXPR_NUMBER);
343 return CMD_CASCADING_FAILURE;
345 else if (lex_match_id ("FILE"))
348 fh = fh_parse (FH_REF_FILE | FH_REF_INLINE);
352 return CMD_CASCADING_FAILURE;
363 t = xmalloc (sizeof *t);
364 t->reader = dfm_open_reader (fh);
366 add_transformation (reread_trns_proc, reread_trns_free, t);
371 /* Executes a REREAD transformation. */
373 reread_trns_proc (void *t_, struct ccase *c, int case_num)
375 struct reread_trns *t = t_;
377 if (t->column == NULL)
378 dfm_reread_record (t->reader, 1);
381 double column = expr_evaluate_num (t->column, c, case_num);
382 if (!finite (column) || column < 1)
384 msg (SE, _("REREAD: Column numbers must be positive finite "
385 "numbers. Column set to 1."));
386 dfm_reread_record (t->reader, 1);
389 dfm_reread_record (t->reader, column);
391 return TRNS_CONTINUE;
394 /* Frees a REREAD transformation.
395 Returns true if successful, false if an I/O error occurred. */
397 reread_trns_free (void *t_)
399 struct reread_trns *t = t_;
400 expr_free (t->column);
401 dfm_close_reader (t->reader);
405 /* Parses END FILE command. */
409 assert (in_input_program ());
411 add_transformation (end_file_trns_proc, NULL, NULL);
413 return lex_end_of_command ();
416 /* Executes an END FILE transformation. */
418 end_file_trns_proc (void *trns_ UNUSED, struct ccase *c UNUSED,
421 return TRNS_END_FILE;