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
29 #include "missing-values.h"
31 /* Script variables. */
36 NUMERIC, /* A numeric variable. */
37 ALPHA /* A string variable. */
40 const char *var_type_adj (enum var_type);
41 const char *var_type_noun (enum var_type);
43 /* A variable's dictionary entry. */
46 /* Dictionary information. */
47 char name[LONG_NAME_LEN + 1]; /* Variable name. Mixed case. */
48 enum var_type type; /* NUMERIC or ALPHA. */
49 int width; /* Size of string variables in chars. */
50 struct missing_values miss; /* Missing values. */
51 struct fmt_spec print; /* Default format for PRINT. */
52 struct fmt_spec write; /* Default format for WRITE. */
53 struct val_labs *val_labs; /* Value labels. */
54 char *label; /* Variable label. */
55 enum measure measure; /* Nominal, ordinal, or continuous. */
56 int display_width; /* Width of data editor column. */
57 enum alignment alignment; /* Alignment of data in GUI. */
59 /* Case information. */
60 int fv, nv; /* Index into `value's, number of values. */
61 bool init; /* True if needs init and possibly reinit. */
62 bool reinit; /* True: reinitialize; false: leave. */
64 /* Data for use by containing dictionary. */
65 int index; /* Dictionary index. */
67 /* Short name, used only for system and portable file input
68 and output. Upper case only. There is no index for short
69 names. Short names are not necessarily unique. Any
70 variable may have no short name, indicated by an empty
72 char short_name[SHORT_NAME_LEN + 1];
74 /* Each command may use these fields as needed. */
76 void (*aux_dtor) (struct variable *);
78 /* Values of a categorical variable. Procedures need
79 vectors with binary entries, so any variable of type ALPHA will
80 have its values stored here. */
81 struct cat_vals *obs_vals;
85 bool var_is_valid_name (const char *, bool issue_error);
86 int compare_var_names (const void *, const void *, void *);
87 unsigned hash_var_name (const void *, void *);
90 void var_set_short_name (struct variable *, const char *);
91 void var_set_short_name_suffix (struct variable *, const char *, int suffix);
92 void var_clear_short_name (struct variable *);
94 /* Pointers to `struct variable', by name. */
95 int compare_var_ptr_names (const void *, const void *, void *);
96 unsigned hash_var_ptr_name (const void *, void *);
98 /* Variable auxiliary data. */
99 void *var_attach_aux (struct variable *,
100 void *aux, void (*aux_dtor) (struct variable *));
101 void var_clear_aux (struct variable *);
102 void *var_detach_aux (struct variable *);
103 void var_dtor_free (struct variable *);
105 /* Classes of variables. */
108 DC_ORDINARY, /* Ordinary identifier. */
109 DC_SYSTEM, /* System variable. */
110 DC_SCRATCH /* Scratch variable. */
113 enum dict_class dict_class_from_id (const char *name);
114 const char *dict_class_to_name (enum dict_class dict_class);
116 /* Vector of variables. */
119 int idx; /* Index for dict_get_vector(). */
120 char name[LONG_NAME_LEN + 1]; /* Name. */
121 struct variable **var; /* Vector of variables. */
122 int cnt; /* Number of variables. */
125 void discard_variables (void);
127 /* This is the active file dictionary. */
128 extern struct dictionary *default_dict;
130 /* Transformation state. */
132 /* Default file handle for DATA LIST, REREAD, REPEATING DATA
134 extern struct file_handle *default_handle;
136 /* PROCESS IF expression. */
137 extern struct expression *process_if_expr;
139 /* TEMPORARY support. */
141 /* 1=TEMPORARY has been executed at some point. */
142 extern int temporary;
144 /* If temporary!=0, the saved dictionary. */
145 extern struct dictionary *temp_dict;
147 /* If temporary!=0, index into t_trns[] (declared far below) that
148 gives the point at which data should be written out. -1 means that
149 the data shouldn't be changed since all transformations are
151 extern size_t temp_trns;
153 /* If FILTER is active, whether it was executed before or after
155 extern int FILTER_before_TEMPORARY;
157 void cancel_temporary (void);
160 void dump_split_vars (const struct ccase *);
162 /* Transformations. */
164 struct transformation;
165 typedef int trns_proc_func (void *, struct ccase *, int);
166 typedef void trns_free_func (void *);
168 /* A transformation. */
169 struct transformation
171 trns_proc_func *proc; /* Transformation proc. */
172 trns_free_func *free; /* Garbage collector proc. */
173 void *private; /* Private data. */
176 /* Array of transformations */
177 extern struct transformation *t_trns;
179 /* Number of transformations, maximum number in array currently. */
180 extern size_t n_trns, m_trns;
182 /* Index of first transformation that is really a transformation. Any
183 transformations before this belong to INPUT PROGRAM. */
184 extern size_t f_trns;
186 void add_transformation (trns_proc_func *, trns_free_func *, void *);
187 size_t next_transformation (void);
188 void cancel_transformations (void);
192 struct var_set *var_set_create_from_dict (const struct dictionary *d);
193 struct var_set *var_set_create_from_array (struct variable *const *var,
196 size_t var_set_get_cnt (const struct var_set *vs);
197 struct variable *var_set_get_var (const struct var_set *vs, size_t idx);
198 struct variable *var_set_lookup_var (const struct var_set *vs,
200 bool var_set_lookup_var_idx (const struct var_set *vs, const char *name,
202 void var_set_destroy (struct var_set *vs);
204 /* Variable parsers. */
208 PV_NONE = 0, /* No options. */
209 PV_SINGLE = 0001, /* Restrict to a single name or TO use. */
210 PV_DUPLICATE = 0002, /* Don't merge duplicates. */
211 PV_APPEND = 0004, /* Append to existing list. */
212 PV_NO_DUPLICATE = 0010, /* Error on duplicates. */
213 PV_NUMERIC = 0020, /* Vars must be numeric. */
214 PV_STRING = 0040, /* Vars must be string. */
215 PV_SAME_TYPE = 00100, /* All vars must be the same type. */
216 PV_NO_SCRATCH = 00200 /* Disallow scratch variables. */
220 struct variable *parse_variable (void);
221 struct variable *parse_dict_variable (const struct dictionary *);
222 int parse_variables (const struct dictionary *, struct variable ***, size_t *,
224 int parse_var_set_vars (const struct var_set *, struct variable ***, size_t *,
226 int parse_DATA_LIST_vars (char ***names, size_t *cnt, int opts);
227 int parse_mixed_vars (char ***names, size_t *cnt, int opts);
228 int parse_mixed_vars_pool (struct pool *,
229 char ***names, size_t *cnt, int opts);
232 /* Return a string representing this variable, in the form most
233 appropriate from a human factors perspective.
234 (IE: the label if it has one, otherwise the name )
236 const char * var_to_string(const struct variable *var);