program = declaration* EOF declaration = const_declaration | variable_declaration | function_declaration | class_declaration | statement class_declaration = "class" IDENTIFIER (":" IDENTIFIER)? "{" method* "}" method = function | "static" function | IDENTIFIER block function_declaration = "fun" function function = IDENTIFIER "(" parameters? ")" block parameters = IDENTIFIER ( "," IDENTIFIER ) * variable_declaration = "var" IDENTIFIER ( "=" expression )? ";" const_declaration = "const" IDENTIFIER "=" expression ";" statement = expression_statement | print_statement | println_statement | block | if_statement | while_statement | for_statement | break_statement | continue_statement | assert_statement | return_statement return_statement = "return" expression? ";" assert_statement = "assert" logical_or ("," expression)? ";" break_statement = "break" ";" continue_statement = "continue" ";" for_statement = "for" variable_declaration? ";" expression? ";" expression? block while_statement = "while" expression block if_statement = "if" expression block ("else" block)? block = "{" declaration* "}" print_statement = "print" expression ";" println_statement = "println" expression ";" expression_statement = expression ";" expression = comma comma = assignment ( "," assignment )* assignment = (call ".")? IDENTIFIER assignment_operator assignment | ternary asssignment_operator = "=" | "=" | "+=" | "-=" | "/=" | "%=" ternary = logical_or | logical_or "?" expression ":" ternary logical_or = logical_and ("or" logical_and) logical_and = equality ("and" equality)* equality = comparison ( ("==" | "!=") comparison)* comparison = term | ( (">" | ">=" | "<" | "<=") term)* term = factor | ( ("+" | "-") factor)* factor = unary | ( ("" | "/" | "%") unary) unary = (("!" | "-" | "not") unary) | call call = primary ( "(" arguments? ")" | "." IDENTIFIER)* arguments = assignment ("," assignment)* primary = "false" | "true" | "nil" | NUMBER | STRING | "(" expression ")" | IDENTIFIER | arrow_function arrow_function = "(" parameters? ")" "=>" (block | expression)