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% Copyright (C) 2000 Artifex Software Inc. All rights reserved.
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%
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% This software is provided AS-IS with no warranty, either express or
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% implied.
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%
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% This software is distributed under license and may not be copied,
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% modified or distributed except as expressly authorized under the terms
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% of the license contained in the file LICENSE in this distribution.
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%
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% For more information about licensing, please refer to
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% http://www.ghostscript.com/licensing/. For information on
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% commercial licensing, go to http://www.artifex.com/licensing/ or
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% contact Artifex Software, Inc., 101 Lucas Valley Road #110,
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% San Rafael, CA 94903, U.S.A., +1(415)492-9861.
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% $Id: gs_dscp.ps,v 1.6 2002/02/21 21:49:28 giles Exp $
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% Postscript interface routines to DSC parser
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/send_orientation { % <orientation> send_orientation -
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% .parse_dsc_comments returns -1 for an Orientation key with an
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% unrecognized value.
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dup 0 ge {
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<< /Orientation 2 index >> setpagedevice
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} if pop
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} bind def
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% This dictionary contains local handlers for DSC comments.
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% See header in zdscpars.c for more information.
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% <dsc_dict> handler <dsc_dict>
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/DSCparseprocs mark
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/Orientation { dup /Orientation get send_orientation } bind
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/PageOrientation { dup /PageOrientation .knownget { send_orientation }
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{ dup /Orientation .knownget { send_orientation } if }
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ifelse } bind
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/Page { dup /Orientation .knownget { send_orientation } if } bind
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/NOP { } bind
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.dicttomark readonly def
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% This procedure is called whenever a DSC comment is found by the interpreter
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/do_parse_dsc false def
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/parse_dsc { % <file> <DSC string> [<prev proc>]
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% parse_dsc -
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% Run any previously installed parser.
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do_parse_dsc { % Check if this parser is enabled
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currentglobal true setglobal % Go to global VM, save old state
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3 1 roll % Put old VM state under <file> <string>
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dsc_dict exch % <VM state> <file> <dict> <string>
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.parse_dsc_comments % <VM state> <file> <dict> <DSC name>
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4 -1 roll % Get old VM state from under <file> <dict> <DSC name>
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setglobal % restore previous VM state
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//DSCparseprocs exch .knownget { % Check DSC name against local handler list
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exec % execute any local handler
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} if
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} if
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pop pop % remove file, dict
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} bind def
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% Check whether the currently installed parser is the one defined in this file.
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/.using_parse_dsc { % - .using_parse_dsc <proc> <using?>
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currentuserparams /ProcessDSCComment get
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dup null eq { pop {{//null} //parse_dsc exec} } if
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dup length 3 eq {
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dup dup length 1 sub get /parse_dsc load eq
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} {
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false
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} ifelse
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} bind def
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% Establish a binding for dsc_dict.
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userdict /dsc_dict null put
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% - dsc_init -
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/dsc_init { % Initialize DSC parser
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currentglobal true setglobal
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/dsc_dict 50 dict store % Size must be large enough for all DSC values
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dsc_dict .initialize_dsc_parser
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.using_parse_dsc {
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% Already using this parser.
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pop
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} {
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% Encapsulate the previous parser. We know it is in global VM:
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% allocate the new one in global VM as well.
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1 array astore
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/parse_dsc load /exec load 3 array astore cvx readonly
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<< /ProcessDSCComment 3 -1 roll >>
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setuserparams
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} ifelse
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setglobal
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/do_parse_dsc true def
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} bind def
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% Enable the DSC parser defined in this file.
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% - enable_dsc -
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/enable_dsc {
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dsc_init
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} bind def
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% Disable the DSC parser defined in this file.
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% - disable_dsc -
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/disable_dsc {
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% There might be another parser installed: if so, restore it.
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% (If it has encapsulated our parser, we can't.)
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.using_parse_dsc {
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% Restore the parser we encapsulated.
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currentglobal true setglobal exch
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<< /ProcessDSCComment 3 -1 roll >>
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exch setglobal setuserparams
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} {
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pop
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} ifelse
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% If we couldn't restore the old parser, at least disable ours.
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/do_parse_dsc false def
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} bind def
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