未指定时,<format>默认为%(objectname)SPC%(objecttype)TAB%(refname)。
ASCII0Bh(VT)\fformfeed,ASCII0Ch(FF)\rcarriagereturn,ASCII0Dh(CR)\eescape,ASCII1Bh(ESC)\sspace,ASCII20h(SPC
spc10:nul10,10);len-=10;}rb_str_buf_cat(res,(type=='A')?