From e65699f8d37e4d4b069afad55f2d22bfa271d101 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?William=20Herg=C3=A8s?= <william@herges.fr>
Date: Sat, 8 Nov 2025 23:31:59 +0100
Subject: feat(calc): use rational number for abitrary precision

---
 lib/elixir_math_parser.ex | 14 ++++++++++++--
 lib/main.ex               |  4 +++-
 2 files changed, 15 insertions(+), 3 deletions(-)

(limited to 'lib')

diff --git a/lib/elixir_math_parser.ex b/lib/elixir_math_parser.ex
index bb24d88..f7f916f 100644
--- a/lib/elixir_math_parser.ex
+++ b/lib/elixir_math_parser.ex
@@ -3,8 +3,11 @@ defmodule ElixirMathParser do
   Documentation for `ElixirMathParser`.
   """
 
+  defdelegate numerator <~> denominator, to: Ratio, as: :new
+  use Numbers, overload_operators: true
+
   defp reduce_to_value({:int, _line, value}, _state) do
-    {:ok, value}
+    {:ok, value <~> 1}
   end
 
   defp reduce_to_value({:var, _line, var}, state) do
@@ -51,7 +54,14 @@ defmodule ElixirMathParser do
 
   defp evaluate_tree([{:eval, expr} | tail], state) do
     with {:ok, expr} <- reduce_to_value(expr, state) do
-      IO.puts(expr)
+      num = Ratio.numerator(expr)
+      den = Ratio.denominator(expr)
+
+      case den do
+        1 -> IO.puts(num)
+        _ -> IO.puts("#{num}/#{den}")
+      end
+
       evaluate_tree(tail, state)
     end
   end
diff --git a/lib/main.ex b/lib/main.ex
index ad657ca..5418da5 100644
--- a/lib/main.ex
+++ b/lib/main.ex
@@ -7,8 +7,9 @@ defmodule ElixirMathParser.Main do
   def process_parse({:ok, tree}) do
     IO.puts("\nParse tree")
     IO.inspect(tree, pretty: true)
+
     case ElixirMathParser.process_tree(tree) do
-      {:ok, _} -> :ok 
+      {:ok, _} -> :ok
       {:error, reason} -> reason
     end
   end
@@ -23,6 +24,7 @@ defmodule ElixirMathParser.Main do
     IO.puts("Parsed #{filename}, stopped at line #{line}")
 
     res = process_parse(:elixir_math_parser.parse(tokens))
+
     if res != :ok do
       IO.puts(res)
     end
-- 
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