#include <stddef.h>
#include "data/case.h"
-/* trns_proc_func return values. */
+/* One transformation. */
+
enum trns_result
{
- TRNS_CONTINUE = -1, /* Continue to next transformation. */
- TRNS_DROP_CASE = -2, /* Drop this case. */
- TRNS_ERROR = -3, /* A serious error, so stop the procedure. */
- TRNS_END_CASE = -4, /* Skip to next case. INPUT PROGRAM only. */
- TRNS_END_FILE = -5 /* End of input. INPUT PROGRAM only. */
+ TRNS_CONTINUE, /* Continue to next transformation. */
+ TRNS_BREAK, /* Break out of LOOP. */
+ TRNS_DROP_CASE, /* Drop this case. */
+ TRNS_ERROR, /* A serious error, so stop the procedure. */
+ TRNS_END_CASE, /* Skip to next case. INPUT PROGRAM only. */
+ TRNS_END_FILE /* End of input. INPUT PROGRAM only. */
};
struct ccase;
-typedef void trns_finalize_func (void *);
-typedef int trns_proc_func (void *, struct ccase **, casenumber);
-typedef bool trns_free_func (void *);
+
+struct trns_class
+ {
+ const char *name; /* For debugging. */
+ enum trns_result (*execute) (void *aux, struct ccase **, casenumber);
+ bool (*destroy) (void *aux);
+ };
+
+struct transformation
+ {
+ const struct trns_class *class;
+ void *aux;
+ };
\f
-/* Transformation chains. */
+/* A chain of transformations. */
-struct trns_chain *trns_chain_create (void);
-void trns_chain_finalize (struct trns_chain *);
-bool trns_chain_destroy (struct trns_chain *);
+struct trns_chain
+ {
+ struct transformation *xforms;
+ size_t n;
+ size_t allocated;
+ };
-bool trns_chain_is_empty (const struct trns_chain *);
+#define TRNS_CHAIN_INIT { .n = 0 }
-void trns_chain_append (struct trns_chain *, trns_finalize_func *,
- trns_proc_func *, trns_free_func *, void *);
-size_t trns_chain_next (struct trns_chain *);
-enum trns_result trns_chain_execute (const struct trns_chain *,
- enum trns_result, struct ccase **,
- casenumber case_nr);
+void trns_chain_init (struct trns_chain *);
+bool trns_chain_uninit (struct trns_chain *);
+bool trns_chain_clear (struct trns_chain *);
+
+void trns_chain_append (struct trns_chain *, const struct transformation *);
void trns_chain_splice (struct trns_chain *, struct trns_chain *);
+enum trns_result trns_chain_execute (const struct trns_chain *,
+ casenumber case_num, struct ccase **);
+
#endif /* transformations.h */