Reference features in rolls by slug

app/services/dice_roller.rb

@@ -13,8 +13,8 @@ class DiceRoller
   end
 
   def roll
-    @roll_command = @roll_command.sub("self", @stat.to_s) if @roll_command.include?("self")
-    Dice.roll(@roll_command)
+    roll_command = parse_roll_command_references(roll_command)
+    Dice.roll(roll_command)
   end
 
   def valid?
@@ -39,6 +39,10 @@ class DiceRoller
 
   private
 
+    def roll_delimiters
+      [ "+", "-", "*", "/" ]
+    end
+
     def roll_dice(command)
       parts = command.downcase.split("d").compact_blank
       die_type = parts.last
@@ -52,4 +56,18 @@ class DiceRoller
       end
       result
     end
+
+    def parse_roll_command_references(roll_command)
+      roll_command = @roll_command.include?("self") ? @roll_command.gsub("self", @stat.to_s) : @roll_command
+
+      roll_command.split(Regexp.union(roll_delimiters)).each do |part|
+        next if part.match?(/\A\d*\z/)
+        next if part.match?(/\A\d*d\d*\z/)
+
+        value = CharacterSheetFeature.find_by(slug: part).featurable.value
+        raise "#{part} not found" if value.blank?
+        roll_command.gsub!(part, value.to_s)
+      end
+      roll_command
+    end
 end

todo.md

@@ -1,10 +1,9 @@
 Character sheets
 = Must haves
-- Refer to stat in roll (Skill in Troika)
+- Add tests for feature references
 - Lists
 - Reorganise sections
 - Edit additional roll types
-- improve dice roll parsing to allow e.g. choose highest
 = Nice to haves
 - Calculate from result - e.g. troika damage roll should calc. damage amount from die roll:w
 - Add min/max when creating stats