X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Fdata%2Fcasereader.h;h=3df80cb08fb8d38acc302e0654a0217dd666287a;hb=1fe087cbcce6a9eb41928b7af6b58c7a2aac47f8;hp=31e448fbc2215ccc00f9fb087307c283246edf7e;hpb=43b1296aafe7582e7dbe6c2b6a8b478d7d9b0fcf;p=pspp

diff --git a/src/data/casereader.h b/src/data/casereader.h
index 31e448fbc2..3df80cb08f 100644
--- 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 *
@@ -105,10 +107,39 @@ casereader_create_counter (struct casereader *, casenumber *counter,
 
 struct casereader *
 casereader_create_translator (struct casereader *, size_t output_value_cnt,
-                              void (*translate) (const struct ccase *input,
+                              void (*translate) (struct ccase *input,
                                                  struct ccase *output,
                                                  void *aux),
                               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);
+
+enum rank_error
+  {
+    RANK_ERR_NONE = 0,
+    RANK_ERR_NEGATIVE_WEIGHT = 0x01,
+    RANK_ERR_UNSORTED = 0x02
+  };
+
+
+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,
+			       enum rank_error *err,
+			       distinct_func *distinct_callback, void *aux);
+
+
 #endif /* data/casereader.h */