From 2019a495893f138f70e189483f36b219eabe20e2 Mon Sep 17 00:00:00 2001
From: Anhgelus Morhtuuzh <william@herges.fr>
Date: Mon, 10 Nov 2025 00:06:09 +0100
Subject: feat(calc): supports unary minus

---
 README.md                  | 2 +-
 example/input.txt          | 2 +-
 src/elixir_math_parser.yrl | 1 +
 3 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index 65f2454..ea7d98c 100644
--- a/README.md
+++ b/README.md
@@ -2,4 +2,4 @@
 
 A math script parser in Elixir.
 
-Using leex, yecc and ratio.
+Using leex, yecc and a modified version of Ratio from hexpm.
diff --git a/example/input.txt b/example/input.txt
index 8cb02c5..32146f2 100644
--- a/example/input.txt
+++ b/example/input.txt
@@ -6,4 +6,4 @@ y = 2!
 z = y/2 
 10 + 4(z / y)(x / 4)
 
-x^(0-y)
+x^(-y)
diff --git a/src/elixir_math_parser.yrl b/src/elixir_math_parser.yrl
index 006c768..f8de916 100644
--- a/src/elixir_math_parser.yrl
+++ b/src/elixir_math_parser.yrl
@@ -50,6 +50,7 @@ expr -> exprs '/' exprs : {div_op, '$1', '$3'}.
 expr -> expr '!' : {factor_op, '$1'}.
 expr -> exprs '^' exprs : {exp_op, '$1', '$3'}.
 expr -> '(' exprs ')' : '$2'.
+expr -> '-' exprs : {sub_op, {int, 0, 0}, '$2'}.
 
 Erlang code.
 
-- 
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