From 0f4b96b2b02822abf6f84903366709b1336905a2 Mon Sep 17 00:00:00 2001
From: Shagun Agrawal <agrawalshagun07@gmail.com>
Date: Sun, 11 Aug 2024 00:22:05 +0530
Subject: Add bitwise operators

---
 src/cljcc/parser.clj | 31 +++++++++++++++++++++++++++++--
 1 file changed, 29 insertions(+), 2 deletions(-)

(limited to 'src/cljcc/parser.clj')

diff --git a/src/cljcc/parser.clj b/src/cljcc/parser.clj
index bee6d32..0d95ac8 100644
--- a/src/cljcc/parser.clj
+++ b/src/cljcc/parser.clj
@@ -44,11 +44,38 @@
     keyword = #'int\\b' | #'return\\b' | #'void\\b'"
    :auto-whitespace whitespace))
 
+(def bitwise-parser
+  (insta/parser
+   "<program> = function+
+    function = #'int\\b' identifier <'('> #'void\\b' <')'> <'{'> statement <'}'>
+    statement = #'return\\b' exp <';'>
+    exp = exp-prime
+    <exp-prime> = mul-div-mod | add-exp | sub-exp
+    add-exp = exp-prime <'+'> mul-div-mod
+    sub-exp = exp-prime <'-'> mul-div-mod
+    <mul-div-mod> = bitwise-exp-prime | mul-exp | div-exp | mod-exp
+    mul-exp = mul-div-mod <'*'> bitwise-exp-prime
+    div-exp = mul-div-mod <'/'> bitwise-exp-prime
+    mod-exp = mul-div-mod <'%'> bitwise-exp-prime
+    <bitwise-exp-prime> = bit-and-exp | bit-or-exp | bit-xor-exp | bit-left-shift-exp | bit-right-shift-exp | term
+    bit-and-exp = bitwise-exp-prime <'&'> term
+    bit-or-exp = bitwise-exp-prime <'|'> term
+    bit-xor-exp = bitwise-exp-prime <'^'> term
+    bit-left-shift-exp = bitwise-exp-prime <'<<'> term
+    bit-right-shift-exp = bitwise-exp-prime <'>>'> term
+    <term> = constant-exp | unary-exp | <'('> exp-prime <')'>
+    unary-exp = unary-operator term
+    unary-operator = #'-' | #'~'
+    identifier = #'[a-zA-Z_]\\w*\\b'
+    constant-exp = #'[0-9]+\\b'
+    keyword = #'int\\b' | #'return\\b' | #'void\\b'"
+   :auto-whitespace whitespace))
+
 (defn parseable? [result]
   (not (insta/failure? result)))
 
 (defn parse [source]
-  (binop-parser source))
+  (bitwise-parser source))
 
 (comment
 
@@ -64,7 +91,7 @@
    }")
 
   (pp/pprint (parse "int main(void) {
-   return -(((((10)))));
+   return 1 & 2 + 6 & 6;
    }"))
 
   (pp/pprint
-- 
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