From 6677124f1f1fa913c72af95b6e504274db52cc31 Mon Sep 17 00:00:00 2001
From: shaoying <shylinux@icloud.com>
Date: Wed, 23 Jun 2021 10:14:21 +0800
Subject: [PATCH] add yac.txt

---
 etc/yac.txt | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 etc/yac.txt

diff --git a/etc/yac.txt b/etc/yac.txt
new file mode 100644
index 00000000..5cba104e
--- /dev/null
+++ b/etc/yac.txt
@@ -0,0 +1,18 @@
+num num [0-9]+
+key key [a-zA-Z]+
+
+op2 op2 [>=<]
+op2 op2 [+\-*/%]
+val val mul{ num key }
+exp exp val
+exp exp val op2 val
+
+stm var var key = exp
+stm let let key = exp
+stm for for exp
+stm if if exp
+stm end end
+stm cmd pwd
+
+script script rep{ stm }
+