Merge pull request #499 from bcdice/fate_core_system

Fate Core System

lib/bcdice/game_system.rb

@@ -68,6 +68,7 @@
 require "bcdice/game_system/Emoklore"
 require "bcdice/game_system/EndBreaker"
 require "bcdice/game_system/EtrianOdysseySRS"
+require "bcdice/game_system/FateCoreSystem"
 require "bcdice/game_system/Fiasco"
 require "bcdice/game_system/Fiasco_Korean"
 require "bcdice/game_system/FilledWith"

lib/bcdice/game_system/FateCoreSystem.rb

@@ -0,0 +1,117 @@
+# frozen_string_literal: true
+
+module BCDice
+  module GameSystem
+    class FateCoreSystem < Base
+      # ゲームシステムの識別子
+      ID = 'FateCoreSystem'
+
+      # ゲームシステム名
+      NAME = 'Fate Core System'
+
+      # ゲームシステム名の読みがな
+      SORT_KEY = 'ふえいとこあしすてむ'
+
+      # ダイスボットの使い方
+      HELP_MESSAGE = <<~MESSAGETEXT
+        ■ ファッジダイスによる判定 (xDF+y>=t)
+          ファッジダイスをx個ダイスロールし、結果を判定します。
+          x: ダイス数
+          y: 修正値（省略可）
+          t: 目標値値（省略可）
+          例）4DF, 4DF>=3, 4DF+1>=3
+      MESSAGETEXT
+
+      register_prefix('\d+DF')
+
+      def eval_game_system_specific_command(command)
+        roll_df(command)
+      end
+
+      private
+
+      def roll_df(command)
+        parser = Command::Parser.new("DF", round_type: @round_type)
+                                .enable_prefix_number()
+                                .restrict_cmp_op_to(:>=, nil)
+
+        parsed = parser.parse(command)
+        unless parsed
+          return nil
+        end
+
+        dice_list = roll_fate_dice(parsed.prefix_number)
+        total = dice_list.sum() + parsed.modify_number
+
+        fate_dice_list = dice_list.map do |i|
+          if i.zero?
+            "[ ]"
+          elsif i.positive?
+            "[+]"
+          else
+            "[-]"
+          end
+        end
+
+        result = outcome(total, parsed.target_number)
+        sequence = [
+          "(#{parsed})",
+          "#{fate_dice_list.join()}#{Format.modifier(parsed.modify_number)}",
+          result_ladder(total),
+          result.text,
+        ]
+
+        result.text = sequence.compact.join(" ＞ ")
+        return result
+      end
+
+      def roll_fate_dice(times)
+        @randomizer.roll_barabara(times, 3).map { |i| i - 2 }
+      end
+
+      def result_ladder(total)
+        ladder =
+          case total.clamp(-2, 8)
+          when 8
+            "Legendary"
+          when 7
+            "Epic"
+          when 6
+            "Fantastic"
+          when 5
+            "Superb"
+          when 4
+            "Great"
+          when 3
+            "Good"
+          when 2
+            "Fair"
+          when 1
+            "Average"
+          when 0
+            "Mediocre"
+          when -1
+            "Poor"
+          else
+            "Terrible"
+          end
+
+        return "#{ladder}(#{format('%+d', total)})"
+      end
+
+      def outcome(total, target)
+        if target.nil?
+          Result.new
+        elsif total == target
+          Result.success("Tie")
+        elsif total >= target + 3
+          Result.critical("Succeed with Style")
+        elsif total >= target
+          Result.success("Succeed")
+        else
+          Result.failure("Fail")
+        end
+      end
+    end
+  end
+end

test/data/FateCoreSystem.toml

@@ -0,0 +1,219 @@
+[[ test ]]
+game_system = "FateCoreSystem"
+input = "4DF"
+output = "(4DF) ＞ [-][ ][-][-] ＞ Terrible(-3)"
+rands = [
+  { sides = 3, value = 1 },
+  { sides = 3, value = 2 },
+  { sides = 3, value = 1 },
+  { sides = 3, value = 1 },
+]
+
+[[ test ]]
+game_system = "FateCoreSystem"
+input = "4DF"
+output = "(4DF) ＞ [-][ ][-][ ] ＞ Terrible(-2)"
+rands = [
+  { sides = 3, value = 1 },
+  { sides = 3, value = 2 },
+  { sides = 3, value = 1 },
+  { sides = 3, value = 2 },
+]
+
+[[ test ]]
+game_system = "FateCoreSystem"
+input = "4DF"
+output = "(4DF) ＞ [ ][ ][-][ ] ＞ Poor(-1)"
+rands = [
+  { sides = 3, value = 2 },
+  { sides = 3, value = 2 },
+  { sides = 3, value = 1 },
+  { sides = 3, value = 2 },
+]
+
+[[ test ]]
+game_system = "FateCoreSystem"
+input = "4DF"
+output = "(4DF) ＞ [ ][ ][ ][ ] ＞ Mediocre(+0)"
+rands = [
+  { sides = 3, value = 2 },
+  { sides = 3, value = 2 },
+  { sides = 3, value = 2 },
+  { sides = 3, value = 2 },
+]
+
+[[ test ]]
+game_system = "FateCoreSystem"
+input = "4DF"
+output = "(4DF) ＞ [+][ ][ ][ ] ＞ Average(+1)"
+rands = [
+  { sides = 3, value = 3 },
+  { sides = 3, value = 2 },
+  { sides = 3, value = 2 },
+  { sides = 3, value = 2 },
+]
+
+[[ test ]]
+game_system = "FateCoreSystem"
+input = "4DF"
+output = "(4DF) ＞ [+][+][ ][ ] ＞ Fair(+2)"
+rands = [
+  { sides = 3, value = 3 },
+  { sides = 3, value = 3 },
+  { sides = 3, value = 2 },
+  { sides = 3, value = 2 },
+]
+
+[[ test ]]
+game_system = "FateCoreSystem"
+input = "4DF"
+output = "(4DF) ＞ [+][+][+][ ] ＞ Good(+3)"
+rands = [
+  { sides = 3, value = 3 },
+  { sides = 3, value = 3 },
+  { sides = 3, value = 3 },
+  { sides = 3, value = 2 },
+]
+
+[[ test ]]
+game_system = "FateCoreSystem"
+input = "4DF"
+output = "(4DF) ＞ [+][+][+][+] ＞ Great(+4)"
+rands = [
+  { sides = 3, value = 3 },
+  { sides = 3, value = 3 },
+  { sides = 3, value = 3 },
+  { sides = 3, value = 3 },
+]
+
+[[ test ]]
+game_system = "FateCoreSystem"
+input = "5DF"
+output = "(5DF) ＞ [+][+][+][+][+] ＞ Superb(+5)"
+rands = [
+  { sides = 3, value = 3 },
+  { sides = 3, value = 3 },
+  { sides = 3, value = 3 },
+  { sides = 3, value = 3 },
+  { sides = 3, value = 3 },
+]
+
+[[ test ]]
+game_system = "FateCoreSystem"
+input = "5DF+1"
+output = "(5DF+1) ＞ [+][+][+][+][+]+1 ＞ Fantastic(+6)"
+rands = [
+  { sides = 3, value = 3 },
+  { sides = 3, value = 3 },
+  { sides = 3, value = 3 },
+  { sides = 3, value = 3 },
+  { sides = 3, value = 3 },
+]
+
+[[ test ]]
+game_system = "FateCoreSystem"
+input = "5DF+2"
+output = "(5DF+2) ＞ [+][+][+][+][+]+2 ＞ Epic(+7)"
+rands = [
+  { sides = 3, value = 3 },
+  { sides = 3, value = 3 },
+  { sides = 3, value = 3 },
+  { sides = 3, value = 3 },
+  { sides = 3, value = 3 },
+]
+
+[[ test ]]
+game_system = "FateCoreSystem"
+input = "5DF+3"
+output = "(5DF+3) ＞ [+][+][+][+][+]+3 ＞ Legendary(+8)"
+rands = [
+  { sides = 3, value = 3 },
+  { sides = 3, value = 3 },
+  { sides = 3, value = 3 },
+  { sides = 3, value = 3 },
+  { sides = 3, value = 3 },
+]
+
+[[ test ]]
+game_system = "FateCoreSystem"
+input = "5DF+4"
+output = "(5DF+4) ＞ [+][+][+][+][+]+4 ＞ Legendary(+9)"
+rands = [
+  { sides = 3, value = 3 },
+  { sides = 3, value = 3 },
+  { sides = 3, value = 3 },
+  { sides = 3, value = 3 },
+  { sides = 3, value = 3 },
+]
+
+[[ test ]]
+game_system = "FateCoreSystem"
+input = "4DF"
+output = "(4DF) ＞ [ ][-][ ][+] ＞ Mediocre(+0)"
+rands = [
+  { sides = 3, value = 2 },
+  { sides = 3, value = 1 },
+  { sides = 3, value = 2 },
+  { sides = 3, value = 3 },
+]
+
+[[ test ]]
+game_system = "FateCoreSystem"
+input = "4DF>=3"
+output = "(4DF>=3) ＞ [+][+][+][+] ＞ Great(+4) ＞ Succeed"
+success = true
+rands = [
+  { sides = 3, value = 3 },
+  { sides = 3, value = 3 },
+  { sides = 3, value = 3 },
+  { sides = 3, value = 3 },
+]
+
+[[ test ]]
+game_system = "FateCoreSystem"
+input = "4DF+1>=3"
+output = "(4DF+1>=3) ＞ [+][+][+][+]+1 ＞ Superb(+5) ＞ Succeed"
+success = true
+rands = [
+  { sides = 3, value = 3 },
+  { sides = 3, value = 3 },
+  { sides = 3, value = 3 },
+  { sides = 3, value = 3 },
+]
+
+[[ test ]]
+game_system = "FateCoreSystem"
+input = "4DF+2>=3"
+output = "(4DF+2>=3) ＞ [+][+][+][+]+2 ＞ Fantastic(+6) ＞ Succeed with Style"
+success = true
+critical = true
+rands = [
+  { sides = 3, value = 3 },
+  { sides = 3, value = 3 },
+  { sides = 3, value = 3 },
+  { sides = 3, value = 3 },
+]
+
+[[ test ]]
+game_system = "FateCoreSystem"
+input = "4DF+1>=3"
+output = "(4DF+1>=3) ＞ [+][+][+][-]+1 ＞ Good(+3) ＞ Tie"
+success = true
+rands = [
+  { sides = 3, value = 3 },
+  { sides = 3, value = 3 },
+  { sides = 3, value = 3 },
+  { sides = 3, value = 1 },
+]
+
+[[ test ]]
+game_system = "FateCoreSystem"
+input = "4DF+1>=3"
+output = "(4DF+1>=3) ＞ [+][ ][+][-]+1 ＞ Fair(+2) ＞ Fail"
+failure = true
+rands = [
+  { sides = 3, value = 3 },
+  { sides = 3, value = 2 },
+  { sides = 3, value = 3 },
+  { sides = 3, value = 1 },
+]