%  Copyright (C) 2000 Artifex Software Inc.   All rights reserved.% % This software is provided AS-IS with no warranty, either express or% implied.% % This software is distributed under license and may not be copied,% modified or distributed except as expressly authorized under the terms% of the license contained in the file LICENSE in this distribution.% % For more information about licensing, please refer to% http://www.ghostscript.com/licensing/. For information on% commercial licensing, go to http://www.artifex.com/licensing/ or% contact Artifex Software, Inc., 101 Lucas Valley Road #110,% San Rafael, CA  94903, U.S.A., +1(415)492-9861. % $Id: gs_dscp.ps,v 1.6 2002/02/21 21:49:28 giles Exp $%  Postscript interface routines to DSC parser /send_orientation {			% <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.% <dsc_dict> handler <dsc_dict>/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 {				% <file> <DSC string> [<prev proc>]					%   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 <file> <string>    dsc_dict exch			% <VM state> <file> <dict> <string>    .parse_dsc_comments			% <VM state> <file> <dict> <DSC name>    4 -1 roll				% Get old VM state from under <file> <dict> <DSC name>    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 <proc> <using?>  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