added `LBRACE` and `RBRACE` tokens to lexer

src/Lexer.php

@@ -104,6 +104,14 @@ class Lexer {
 						$clearBuffer();
 						array_push($tokens, new Token(TokenType::COLON, $char));
 						break;
+					case '{':
+						$clearBuffer();
+						array_push($tokens, new Token(TokenType::LBRACE, $char));
+						break;
+					case '}':
+						$clearBuffer();
+						array_push($tokens, new Token(TokenType::RBRACE, $char));
+						break;
 					default:
 						$buffer .= $char;
 						break;

src/Token.php

@@ -22,6 +22,8 @@ enum TokenType {
 	case PIPE     ;
 	case GT       ;
 	case TAB      ;
+	case LBRACE   ;
+	case RBRACE   ;
 }
 
 class Token {