BGP communities

Good evening, could someone explain me the meaning of these lines? function bgp_out(int peeras) { if ! (source = RTS_BGP ) then return false; if peeras > 65535 then return true; ### communities do not support AS32 if (0,peeras) ~ bgp_community then return false; if (myas,peeras) ~ bgp_community then return true; if (0, myas) ~ bgp_community then return false; return true; } Thanks, Fabiano