grammar = statement*;
statement = (assignment | function_call | function_definition | return_statement) end_of_statement |
	control_structure;
assignment = symbol_name assignment_operator expression;
symbol_name = /[a-zA-Z_][a-zA-Z0-9_]*/;
assignment_operator = "=";
expression = not_operator? (operation | symbol_name | function_call | sub_expression | string |
	number) | return_statement;
not_operator = "!";
operation = expression operator expression;
operator = /\+|-|\*|/|&|\||==|!=|<|>|<=|>=/;
function_call = symbol_name "(" expression_list? ")";
expression_list = expression ("," expression)*;
sub_expression = "(" expression ")";
string = /".*"/;
number = /[+-]?[0-9]+(\.[0-9]+)?/;
return_statement = "return" expression;
function_definition = symbol_name "(" parameter_list? ")" statement_block;
parameter_list = symbol_name ("," symbol_name)*;
statement_block = "{" statement* "}";
end_of_statement = ";";
control_structure = for_structure | while_structure | if_structure;
for_structure = "for" "(" expression? ";" expression? ";" expression? ")" (statement |
	statement_block | end_of_statement);
while_structure = "while" sub_expression (statement | statement_block | end_of_statement);
if_structure = "if" sub_expression (statement | statement_block | end_of_statement);