Operators

operator ::= custom-operator |
             special-operator

custom-operator ::= custom-additive-operator |
                    custom-multiplicative-operator |
                    custom-bitwise-operator |
                    custom-shift-operator
custom-additive-operator ::= [+-~] operator-part*
custom-multiplicative-operator ::= [*/%] operator-part*
custom-bitwise-operator ::= [&|^] operator-part*
custom-shift-operator ::= [><] operator-part*
operator-part ::= [+-~*/%&|^><]

special-operator ::= '=' |
                     '==' |
                     '!=' |
                     '>' |
                     '>=' |
                     '<' |
                     '<='