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- % Copyright (C) 2000 Artifex Software Inc. All rights reserved.
- %
- % This software is licensed to a single customer by Artifex Software Inc.
- % under the terms of a specific OEM agreement.
-
- % $RCSfile: gs_dscp.ps,v $ $Revision: 1.2 $
- % 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
-