dealing with parenthesis buffer

compiler.h

@@ -14,7 +14,7 @@ struct pos
     const char *filename;
 };
 
-#define NUMERCI_CASE \
+#define NUMERIC_CASE \
     case '0':        \
     case '1':        \
     case '2':        \

lexer.c

@@ -13,6 +13,7 @@
     }
 
 struct token *read_next_token();
+bool lex_is_in_expression();
 
 static struct lex_process *lex_process;
 static struct token tmp_token;
@@ -25,6 +26,13 @@ static char peekc()
 static char nextc()
 {
     char c = lex_process->function->next_char(lex_process);
+
+    // write paranethesis to an expression buffer (.e.g (20 + 10))
+    if (lex_is_in_expression())
+    {
+        buffer_write(lex_process->parenthesis_buffer, c);
+    }
+
     lex_process->pos.col += 1;
     if (c == '\n')
     {
@@ -57,6 +65,10 @@ struct token *token_create(struct token *_token)
 {
     memcpy(&tmp_token, _token, sizeof(struct token));
     tmp_token.pos = lex_file_position();
+    if (lex_is_in_expression())
+    {
+        tmp_token.between_brackets = buffer_ptr(lex_process->parenthesis_buffer);
+    }
     return &tmp_token;
 }
 
@@ -259,7 +271,7 @@ static void lex_finish_expression()
 
 bool lex_is_in_expression()
 {
-    return lex_process->current_expression_count >= 0;
+    return lex_process->current_expression_count > 0;
 }
 
 bool is_keyword(const char *str)
@@ -559,7 +571,7 @@ struct token *read_next_token()
 
     switch (c)
     {
-    NUMERCI_CASE:
+    NUMERIC_CASE:
         token = token_make_number();
         break;
 

test.c

@@ -1,10 +1 @@
-50 + 20 - 10 ++(50 + 20)[#] dksdskdk6sd rele_frle pksdk int restrict float continue
-
-    // this is a comment
-    /*
-    multile line comment
-    */
-
-    'a' '\n' '\t'
-
-    0xFE12 0b1110011
+(20 + 10)