From 8b8cdf8873b30fd21f9012a479a42809c079eb42 Mon Sep 17 00:00:00 2001
From: dibyendumajumdar <mobile@majumdar.org.uk>
Date: Sun, 17 Sep 2023 14:06:27 +0100
Subject: Revise grammar for chapter 1. Start writing up Chapter 1.

---
 chapter01/docs/01-grammar.md | 30 ++++++++----------------------
 1 file changed, 8 insertions(+), 22 deletions(-)

(limited to 'chapter01/docs')

diff --git a/chapter01/docs/01-grammar.md b/chapter01/docs/01-grammar.md
index 92ed7357..63816e2e 100644
--- a/chapter01/docs/01-grammar.md
+++ b/chapter01/docs/01-grammar.md
@@ -4,36 +4,22 @@
 grammar SimpleLanguage;
 
 program
-    : declaration* statement+ EOF
-    ;
-
-declaration
-    : type IDENTIFIER ';'
-    ;
-
-type
-    : 'int'
+    : statement EOF
     ;
 
 statement
-    : 'if' '(' expression ')' statement
-    | 'if' '(' expression ')' statement 'else' statement
-    | 'while' '(' expression ')' statement
-    | IDENTIFIER '=' expression ';'
-    | '{' declaration* statement+ '}'
-    | 'break' ';'
+    : 'return' expression ';'
     ;
 
 expression
-    : primaryExpression                                             # PrimaryExpression_
-    | expression ('*' | '/' ) expression                            # ArithmeticOrLogicalExpression
-    | expression ('+' | '-') expression                             # ArithmeticOrLogicalExpression
+    : primaryExpression
     ;
 
 primaryExpression
-    :
-    | INTEGER_LITERAL
-    | IDENTIFIER
-    | '(' expression ')'
+    : INTEGER_LITERAL
     ;
+
+INTEGER_LITERAL
+    : [0-9]+
+    ;    
 ```
\ No newline at end of file
-- 
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