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
25 /* This is the time at which vfm was last invoked. */
26 extern time_t last_vfm_invocation;
29 typedef struct write_case_data *write_case_data;
30 typedef int write_case_func (write_case_data);
32 /* The current active file, from which cases are read. */
33 extern struct case_source *vfm_source;
38 const struct case_source_class *class; /* Class. */
39 void *aux; /* Auxiliary data. */
42 /* A case source class. */
43 struct case_source_class
45 const char *name; /* Identifying name. */
47 /* Returns the exact number of cases that READ will pass to
48 WRITE_CASE, if known, or -1 otherwise. */
49 int (*count) (const struct case_source *);
51 /* Reads the cases one by one into C and for each one calls
52 WRITE_CASE passing the given AUX data. */
53 void (*read) (struct case_source *,
55 write_case_func *write_case, write_case_data aux);
57 /* Destroys the source. */
58 void (*destroy) (struct case_source *);
61 extern const struct case_source_class storage_source_class;
62 extern const struct case_source_class data_list_source_class;
63 extern const struct case_source_class file_type_source_class;
64 extern const struct case_source_class input_program_source_class;
65 extern const struct case_source_class get_source_class;
66 extern const struct case_source_class import_source_class;
67 extern const struct case_source_class sort_source_class;
70 struct case_source *create_case_source (const struct case_source_class *,
72 void free_case_source (struct case_source *);
74 int case_source_is_complex (const struct case_source *);
75 int case_source_is_class (const struct case_source *,
76 const struct case_source_class *);
78 struct casefile *storage_source_get_casefile (struct case_source *);
79 struct case_source *storage_source_create (struct casefile *);
81 /* The replacement active file, to which cases are written. */
82 extern struct case_sink *vfm_sink;
87 const struct case_sink_class *class; /* Class. */
88 void *aux; /* Auxiliary data. */
89 size_t value_cnt; /* Number of `union value's in case. */
92 /* A case sink class. */
93 struct case_sink_class
95 const char *name; /* Identifying name. */
97 /* Opens the sink for writing. */
98 void (*open) (struct case_sink *);
100 /* Writes a case to the sink. */
101 void (*write) (struct case_sink *, const struct ccase *);
103 /* Closes and destroys the sink. */
104 void (*destroy) (struct case_sink *);
106 /* Closes the sink and returns a source that can read back
107 the cases that were written, perhaps transformed in some
108 way. The sink must still be separately destroyed by
109 calling destroy(). */
110 struct case_source *(*make_source) (struct case_sink *);
113 extern const struct case_sink_class storage_sink_class;
114 extern const struct case_sink_class null_sink_class;
116 struct case_sink *create_case_sink (const struct case_sink_class *,
117 const struct dictionary *,
119 void case_sink_open (struct case_sink *);
120 void case_sink_write (struct case_sink *, const struct ccase *);
121 void case_sink_destroy (struct case_sink *);
122 void free_case_sink (struct case_sink *);
124 /* Number of cases to lag. */
127 void procedure (int (*proc_func) (struct ccase *, void *aux), void *aux);
128 void procedure_with_splits (void (*begin_func) (void *aux),
129 int (*proc_func) (struct ccase *, void *aux),
130 void (*end_func) (void *aux),
132 struct ccase *lagged_case (int n_before);
134 void multipass_procedure_with_splits (void (*) (const struct casefile *,