% Copyright (C) 2000 Artifex Software Inc. All rights reserved. % % This program is free software; you can redistribute it and/or modify it % under the terms of the GNU General Public License as published by the % Free Software Foundation; either version 2 of the License, or (at your % option) any later version. % % This program is distributed in the hope that it will be useful, but % WITHOUT ANY WARRANTY; without even the implied warranty of % MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General % Public License for more details. % % You should have received a copy of the GNU General Public License along % with this program; if not, write to the Free Software Foundation, Inc., % 59 Temple Place, Suite 330, Boston, MA, 02111-1307. % $Id: gs_dscp.ps,v 1.4.2.1.2.1 2003/04/12 14:02:38 giles Exp $ % Postscript interface routines to DSC parser /send_orientation { % send_orientation - % .parse_dsc_comments returns -1 for an Orientation key with an % unrecognized value. dup 0 ge { << /Orientation 2 index >> setpagedevice } if pop } bind def % This dictionary contains local handlers for DSC comments. % See header in zdscpars.c for more information. % handler /DSCparseprocs mark /Orientation { dup /Orientation get send_orientation } bind /PageOrientation { dup /PageOrientation .knownget { send_orientation } { dup /Orientation .knownget { send_orientation } if } ifelse } bind /Page { dup /Orientation .knownget { send_orientation } if } bind /NOP { } bind .dicttomark readonly def % This procedure is called whenever a DSC comment is found by the interpreter /do_parse_dsc false def /parse_dsc { % [] % parse_dsc - % Run any previously installed parser. 0 get dup null eq { pop } { 3 copy exec pop } ifelse do_parse_dsc { % Check if this parser is enabled currentglobal true setglobal % Go to global VM, save old state 3 1 roll % Put old VM state under dsc_dict exch % .parse_dsc_comments % 4 -1 roll % Get old VM state from under setglobal % restore previous VM state //DSCparseprocs exch .knownget { % Check DSC name against local handler list exec % execute any local handler } if } if pop pop % remove file, dict } bind def % Check whether the currently installed parser is the one defined in this file. /.using_parse_dsc { % - .using_parse_dsc currentuserparams /ProcessDSCComment get dup null eq { pop {{//null} //parse_dsc exec} } if dup length 3 eq { dup dup length 1 sub get /parse_dsc load eq } { false } ifelse } bind def % Establish a binding for dsc_dict. userdict /dsc_dict null put % - dsc_init - /dsc_init { % Initialize DSC parser currentglobal true setglobal /dsc_dict 50 dict store % Size must be large enough for all DSC values dsc_dict .initialize_dsc_parser .using_parse_dsc { % Already using this parser. pop } { % Encapsulate the previous parser. We know it is in global VM: % allocate the new one in global VM as well. 1 array astore /parse_dsc load /exec load 3 array astore cvx readonly << /ProcessDSCComment 3 -1 roll >> setuserparams } ifelse setglobal /do_parse_dsc true def } bind def % Enable the DSC parser defined in this file. % - enable_dsc - /enable_dsc { dsc_init } bind def % Disable the DSC parser defined in this file. % - disable_dsc - /disable_dsc { % There might be another parser installed: if so, restore it. % (If it has encapsulated our parser, we can't.) .using_parse_dsc { % Restore the parser we encapsulated. 0 get 0 get currentglobal true setglobal exch << /ProcessDSCComment 3 -1 roll >> exch setglobal setuserparams } { pop } ifelse % If we couldn't restore the old parser, at least disable ours. /do_parse_dsc false def } bind def