From 47ad4a9f955fde76c6cf4022fc308f1d0723926d Mon Sep 17 00:00:00 2001
From: Dibyendu Majumdar <mobile@majumdar.org.uk>
Date: Sat, 19 Aug 2023 08:52:57 -0700
Subject: Chapter 1: Introduction

Co-authored-by: Thalia Archibald <thalia@archibald.dev>
Co-authored-by: Cliff Click <cliffc@acm.org>
Co-authored-by: XmiliaH <45106915+XmiliaH@users.noreply.github.com>
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+# Grammar for Chapter 1
+
+```antlrv4
+grammar SimpleLanguage;
+
+program
+    : statement EOF
+    ;
+
+statement
+    : 'return' expression ';'
+    ;
+
+expression
+    : primaryExpression
+    ;
+
+primaryExpression
+    : INTEGER_LITERAL
+    ;
+
+INTEGER_LITERAL
+    : [1-9][0-9]*
+    | [0]
+    ;
+```
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