Unify check_row_index

Author: mrkn

lib/unicode_plot/barplot.rb

@@ -67,12 +67,6 @@ def print_row(out, row_index)
       end
       [max, i]
     end
-
-    private def check_row_index(row_index)
-      unless 0 <= row_index && row_index < n_rows
-        raise ArgumentError, "row_index is out of range"
-      end
-    end
   end
 
   module_function def barplot(*args,

lib/unicode_plot/boxplot.rb

@@ -89,12 +89,6 @@ def print_row(out, row_index)
         val.round(half: :even).clamp(1, @width).to_i
       end
     end
-
-    private def check_row_index(row_index)
-      unless 0 <= row_index && row_index < n_rows
-        raise ArgumentError, "row_index out of bounds"
-      end
-    end
   end
 
   module_function def boxplot(*args,

lib/unicode_plot/plot.rb

@@ -136,5 +136,11 @@ def to_s
       end
       margin
     end
+
+    private def check_row_index(row_index)
+      unless 0 <= row_index && row_index < n_rows
+        raise ArgumentError, "row_index out of bounds"
+      end
+    end
   end
 end