Added new casetranslator for appending ranks.

[pspp-builds.git] / src / data / casereader.h

diff --git a/src/data/casereader.h b/src/data/casereader.h
index d4a1cce5188a7a467569cbceb95ec9f30a1db402..a2d9403bb03bce10ede5a638f459261889d373ad 100644 (file)
--- a/src/data/casereader.h
+++ b/src/data/casereader.h
@@ -70,6 +70,7 @@ void casereader_swap (struct casereader *, struct casereader *);
 
 bool casereader_peek (struct casereader *, casenumber, struct ccase *)
      WARN_UNUSED_RESULT;
+bool casereader_is_empty (struct casereader *);
 
 bool casereader_error (const struct casereader *);
 void casereader_force_error (struct casereader *);
@@ -97,6 +98,7 @@ struct casereader *
 casereader_create_filter_missing (struct casereader *,
                                   const struct variable **vars, size_t var_cnt,
                                   enum mv_class,
+                                 casenumber *n_missing,
                                   struct casewriter *exclude);
 
 struct casereader *
@@ -111,4 +113,25 @@ casereader_create_translator (struct casereader *, size_t output_value_cnt,
                               bool (*destroy) (void *aux),
                               void *aux);
 
+/* A function which creates a numberic value from an existing case */
+typedef double new_value_func (const struct ccase *, casenumber, void *);
+
+struct casereader *
+casereader_create_append_numeric (struct casereader *subreader,
+                                 new_value_func func, void *aux,
+                                 void (*destroy) (void *aux));
+
+struct casereader *
+casereader_create_arithmetic_sequence (struct casereader *,
+                                       double first, double increment);
+
+
+typedef void distinct_func (double v, casenumber n, double w, void *aux);
+
+struct casereader *
+casereader_create_append_rank (struct casereader *,
+                              const struct variable *v, const struct variable *w,
+                              distinct_func *distinct_callback, void *aux);
+
+
 #endif /* data/casereader.h */