From 3b0cc79dee76244da55d2326cc4244a384d85e44 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?William=20Herg=C3=A8s?= <william@herges.fr>
Date: Sun, 9 Nov 2025 13:23:05 +0100
Subject: feat(calc)): supports factorial

---
 src/elixir_math_parser.yrl | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'src/elixir_math_parser.yrl')

diff --git a/src/elixir_math_parser.yrl b/src/elixir_math_parser.yrl
index 86b36c8..0808683 100644
--- a/src/elixir_math_parser.yrl
+++ b/src/elixir_math_parser.yrl
@@ -10,7 +10,7 @@ Terminals
   int
   var
   break
-  '+' '-' '*' '/'
+  '+' '-' '*' '/' '!'
   '='
   '(' ')'
 .
@@ -24,6 +24,7 @@ Left 300 '+'.
 Left 300 '-'.
 Left 400 '*'.
 Left 400 '/'.
+Right 500 '!'.
 Left 600 '('.
 
 root -> statements : '$1'.
@@ -46,6 +47,7 @@ expr -> exprs '-' exprs : {sub_op, '$1', '$3'}.
 expr -> exprs '*' exprs : {mul_op, '$1', '$3'}.
 expr -> exprs '/' exprs : {div_op, '$1', '$3'}.
 expr -> '(' exprs ')' : '$2'.
+expr -> expr '!' : {factor_op, '$1'}.
 
 Erlang code.
 
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