Expression grammar

expr                := comma_expr

comma_expr          := (comma_expr ',')? assignment_expr

assignment_expr     := conditional_expr (('=' | '+=' | '-=' | '*=' | '/=' | '%=' | '&=' | '|=' | '^=' | '<<=' | '>>=') assignment_expr)?

conditional_expr    := logical_or_expr ('?' logical_or_expr ':' conditional_expr)?

logical_or_expr     := (logical_or_expr '||')? logical_and_expr

logical_and_expr    := (logical_and_expr '&&')? bitwise_or_expr

bitwise_or_expr     := (bitwise_or_expr '|')? bitwise_xor_expr

bitwise_xor_expr    := (bitwise_xor_expr '^')? bitwise_and_expr

bitwise_and_expr    := (bitwise_and_expr '&')? equality_expr

equality_expr       := (equality_expr ('==' | '!='))? comparison_expr

comparison_expr     := (comparison_expr ('<' | '<=' | '>' | '>='))? bitwise_shift_expr

bitwise_shift_expr  := (bitwise_shift_expr ('<<' | '>>'))? additive_expr

additive_expr       := (additive_expr ('+' | '-'))? multiplicative_expr

multiplicative_expr := (multiplicative_expr ('*' | '/' | '%'))? unary_expr

unary_expr          := ('!' | '~' | '-' | '+' | '*' | '&' | 'sizeof' | '++' | '--' )? basic_expr

basic_expr          := numbers_and_shit
                    := '(' expr ')'