From 7de4815ab8be342504fd1c07e50158539d0caf9c Mon Sep 17 00:00:00 2001
From: overflowerror <mail@overflowerror.com>
Date: Sat, 2 Mar 2024 19:53:47 +0100
Subject: [PATCH] feat: Add negation to grammar

---
 compiler/src/ast.h    | 1 +
 compiler/src/lexer.l  | 1 +
 compiler/src/parser.y | 5 +++++
 3 files changed, 7 insertions(+)

diff --git a/compiler/src/ast.h b/compiler/src/ast.h
index 7fa1906..f25b3ed 100644
--- a/compiler/src/ast.h
+++ b/compiler/src/ast.h
@@ -60,6 +60,7 @@ enum calc_operator {
     NOT_EQUALS,
     CONJUNCTION,
     DISJUNCTION,
+    NEGATION,
 };
 
 struct calc_expression {
diff --git a/compiler/src/lexer.l b/compiler/src/lexer.l
index d76782b..d48e8a5 100644
--- a/compiler/src/lexer.l
+++ b/compiler/src/lexer.l
@@ -83,6 +83,7 @@ strbuf_t strbuf = NULL;
 <INITIAL>"!="       { return NOT_EQUAL; }
 <INITIAL>"&&"       { return AND; }
 <INITIAL>"||"       { return OR; }
+<INITIAL>"!"        { return NOT; }
 
 <INITIAL>"("        { return OPENING_BRACKETS; }
 <INITIAL>")"        { return CLOSING_BRACKETS; }
diff --git a/compiler/src/parser.y b/compiler/src/parser.y
index f165362..1361b48 100644
--- a/compiler/src/parser.y
+++ b/compiler/src/parser.y
@@ -54,6 +54,7 @@ extern struct block* program;
 %token NOT_EQUAL
 %token AND
 %token OR
+%token NOT
 
 %token OPENING_BRACKETS
 %token CLOSING_BRACKETS
@@ -162,6 +163,10 @@ calcexpr: OPENING_BRACKETS expr op expr CLOSING_BRACKETS
         {
             $$ = calc_expression_new($2, $4, $3);
         }
+    | NOT expr
+        {
+            $$ = calc_expression_new($2, NULL, NEGATION);
+        }
 ;
 
 op: PLUS