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- % Copyright (C) 2000 Artifex Software Inc. All rights reserved.
- %
- % This file is part of AFPL Ghostscript.
- %
- % AFPL Ghostscript is distributed with NO WARRANTY OF ANY KIND. No author or
- % distributor accepts any responsibility for the consequences of using it, or
- % for whether it serves any particular purpose or works at all, unless he or
- % she says so in writing. Refer to the Aladdin Free Public License (the
- % "License") for full details.
- %
- % Every copy of AFPL Ghostscript must include a copy of the License, normally
- % in a plain ASCII text file named PUBLIC. The License grants you the right
- % to copy, modify and redistribute AFPL Ghostscript, but only under certain
- % conditions described in the License. Among other things, the License
- % requires that the copyright notice and this notice be preserved on all
- % copies.
-
- % $Id: gs_dscp.ps,v 1.2.2.1 2000/11/09 23:47:04 rayjj Exp $
- % Postscript interface routines to DSC parser
-
-
- /send_orientation { % <orientation> send_orienation -
- << /Orientation 2 index >> setpagedevice pop
- } bind def
-
- % This dictionary contains local handlers for DSC comments. See header in zdscpars.c
- % <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
- % Check whether this parser is disabled.
- do_parse_dsc {
- dsc_dict exch % <file> <dict> <string>
- .parse_dsc_comments % <file> <dict> <name>
- //DSCparseprocs exch .knownget {
- 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
- /do_parse_dsc true store
- setglobal
- } 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 store
- } bind def
-