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% $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
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