font_metric_cache.rb in prawn-2.3.0

- old
+ new

@@ -1,5 +1,7 @@
+# frozen_string_literal: true
+
 # font_metric_cache.rb : The Prawn font class
 #
 # Copyright Dec 2012, Kenneth Kalmer. All Rights Reserved.
 #
 # This is free software. Please see the LICENSE and COPYING files for details.
@@ -33,11 +35,14 @@
 
       @cache[key] ||= f.compute_width_of(encoded_string, options)
 
       length = @cache[key]
 
-      length +
-        (@document.character_spacing *
-         @document.font.character_count(encoded_string))
+      character_count = @document.font.character_count(encoded_string)
+      if character_count.positive?
+        length += @document.character_spacing * (character_count - 1)
+      end
+
+      length
     end
   end
 end