/* PSPP - a program for statistical analysis.
 Copyright (C) 2008, 2009 Free Software Foundation, Inc.
 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.
 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 GNU General Public License for more details.
 You should have received a copy of the GNU General Public License
 along with this program. If not, see <http://www.gnu.org/licenses/>. */
#ifndef DATA_SUBCASE_H
#define DATA_SUBCASE_H 1
#include <stdbool.h>
#include <stddef.h>
struct ccase;
union value;
struct variable;
/* Sort order. */
enum subcase_direction
 {
 SC_ASCEND, /* A, B, C, ..., X, Y, Z. */
 SC_DESCEND /* Z, Y, X, ..., C, B, A. */
 };
/* A value within a case. */
struct subcase_field
 {
 size_t case_index; /* Starting position in the case. */
 int width; /* 0=numeric, otherwise string width. */
 enum subcase_direction direction; /* Sort order. */
 };
/* A subcase specifies how to draw values from a case. */
struct subcase
 {
 struct subcase_field *fields;
 size_t n_fields;
 struct caseproto *proto; /* Created lazily. */
 };
#define SUBCASE_EMPTY_INITIALIZER { .fields = NULL }
void subcase_init_empty (struct subcase *);
void subcase_init_vars (struct subcase *,
 const struct variable *const *, size_t n_vars);
void subcase_init_var (struct subcase *,
 const struct variable *, enum subcase_direction);
void subcase_init (struct subcase *, int index, int width,
 enum subcase_direction);
void subcase_clone (struct subcase *, const struct subcase *);
void subcase_clear (struct subcase *);
void subcase_uninit (struct subcase *);
bool subcase_contains (const struct subcase *, int case_index);
bool subcase_contains_var (const struct subcase *, const struct variable *);
bool subcase_add (struct subcase *, int case_index, int width,
 enum subcase_direction direction);
bool subcase_add_var (struct subcase *, const struct variable *,
 enum subcase_direction);
void subcase_add_always (struct subcase *sc, int case_index, int width,
 enum subcase_direction direction);
void subcase_add_var_always (struct subcase *, const struct variable *,
 enum subcase_direction);
void subcase_add_vars_always (struct subcase *,
 const struct variable *const *, size_t n_vars);
void subcase_add_proto_always (struct subcase *, const struct caseproto *);
const struct caseproto *subcase_get_proto (const struct subcase *);
static inline bool subcase_is_empty (const struct subcase *);
static inline size_t subcase_get_n_fields (const struct subcase *);
static inline size_t subcase_get_case_index (const struct subcase *,
 size_t idx);
static inline int subcase_get_width (const struct subcase *, size_t idx);
static inline enum subcase_direction subcase_get_direction (
 const struct subcase *, size_t idx);
bool subcase_conformable (const struct subcase *, const struct subcase *);
void subcase_extract (const struct subcase *, const struct ccase *,
 union value *values);
void subcase_inject (const struct subcase *,
 const union value *values, struct ccase *);
void subcase_copy (const struct subcase *src_sc, const struct ccase *src,
 const struct subcase *dst_sc, struct ccase *dst);
int subcase_compare_3way (const struct subcase *a_sc, const struct ccase *a,
 const struct subcase *b_sc, const struct ccase *b);
int subcase_compare_3way_xc (const struct subcase *,
 const union value *a, const struct ccase *b);
int subcase_compare_3way_cx (const struct subcase *,
 const struct ccase *a, const union value *b);
int subcase_compare_3way_xx (const struct subcase *,
 const union value *a, const union value *b);
bool subcase_equal (const struct subcase *a_sc, const struct ccase *a,
 const struct subcase *b_sc, const struct ccase *b);
bool subcase_equal_xc (const struct subcase *,
 const union value *a, const struct ccase *b);
bool subcase_equal_cx (const struct subcase *,
 const struct ccase *a, const union value *b);
bool subcase_equal_xx (const struct subcase *,
 const union value *a, const union value *b);
static inline size_t
subcase_get_case_index (const struct subcase *sc, size_t idx)
{
 return sc->fields[idx].case_index;
}
static inline int
subcase_get_width (const struct subcase *sc, size_t idx)
{
 return sc->fields[idx].width;
}
static inline enum subcase_direction
subcase_get_direction (const struct subcase *sc, size_t idx)
{
 return sc->fields[idx].direction;
}
static inline bool
subcase_is_empty (const struct subcase *sc)
{
 return sc->n_fields == 0;
}
static inline size_t
subcase_get_n_fields (const struct subcase *sc)
{
 return sc->n_fields;
}
#endif /* data/subcase.h */
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