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Code Editor : ehandler.ps

%!PS-Adobe-2.0
% This is based on: ehandler.ps -- Downloaded Error Break-page handler
% Copyright (C) 1984, 1985, 1986 Adobe Systems Incorporated.
% All Rights Reserved.

% Modifications Copyright (C) 1990, 1991 Y&Y.
% 	 print names of dictionaries on dictionary stack
% 	 print first few lines of input stream after error
% 	 print top of execution stack
%	 make visible offending commands that are control characters
% 	 print jobname if it exists
%	 catch errors in error handler and print them
% 	 permit overloading (for debugging of error handler)
% 	 ignore timeout errors
% 	 control hardcopy versus softcopy output
%	 avoid multiple pages with error message

%  NOTE: For hardcopy paper/film output:	set showflag true
%  NOTE: For screen/file output:		set printflag true

0 % exitserver password
/$brkpage where
% {pop} if false % UNCOMMENT THIS LINE TO PERMIT OVERLOADING
    { % ifelse  
    pop pop
    (Error Handler in place - not loaded again\n)
    print flush stop
}{ % else
    dup serverdict begin
    statusdict begin checkpassword { % ifelse
	(Error Handler downloaded.\n) print flush
	exitserver
    }{ % else
	pop
	(Bad Password on loading error handler!!!\n)
	print flush stop
    } ifelse
} ifelse
/$brkpage where {pop} { % to allow overloading
 /$brkpage 64 dict def 
} ifelse % to allow overloading
$brkpage begin
/showflag true def	% set to true for hardcopy paper/film output
/printflag false def	% set to true for sending back to screen/file
/prnt { % def
    dup type /stringtype ne {=string cvs} if
    dup length 1 eq { dup 0 get 32 lt { dup 0 get  % new
    64 add exch pop (control-X) dup 8 4 -1 roll put} if} if % new
    dup length 6 mul
    /tx exch def /ty 10 def
    currentpoint /toy exch def /tox exch def
    1 setgray newpath
    tox toy 2 sub moveto
    0 ty rlineto tx 0 rlineto
    0 ty neg rlineto
    closepath showflag{fill}if
    tox toy moveto 0 setgray 
    showflag{dup show}if printflag{print}{pop}ifelse
} bind def
/nl { % def
    currentpoint exch pop lmargin exch moveto
    0 -10 rmoveto
    printflag{(\n) print flush}if
} def

/== {/cp 0 def typeprint nl} def
/typeprint {
    dup type dup currentdict exch known {exec}{unknowntype}ifelse
} readonly def
/lmargin 72 def /rmargin 72 def
/tprint { % def
    dup length cp add rmargin gt {nl /cp 0 def} if
    dup length cp add /cp exch def
    prnt
} readonly def
/cvsprint {=string cvs tprint ( ) tprint} readonly def
/unknowntype { % def
    exch pop cvlit (??) tprint cvsprint
} readonly def
/integertype {cvsprint} readonly def
/realtype {cvsprint} readonly def
/booleantype {cvsprint} readonly def
/operatortype {(//) tprint cvsprint} readonly def
/marktype {pop (-mark- ) tprint} readonly def
% /dicttype {pop (-dictionary- ) tprint} readonly def % do more:
/dicttype {namedict cvsprint} readonly def
/nulltype {pop (-null- ) tprint} readonly def
/filetype {pop (-filestream- ) tprint} readonly def
/savetype {pop (-savelevel- ) tprint} readonly def
/fonttype {pop (-fontid- ) tprint} readonly def
/nametype { % def
    dup xcheck not {(/) tprint} if cvsprint
}readonly def
/stringtype { % def
    dup rcheck { % ifelse
	($) tprint tprint ($) tprint
    }{ % else
	pop (-string- ) tprint
    } ifelse
} readonly def
/arraytype { % def
    dup rcheck { % ifelse
	dup xcheck { % ifelse
	    ({) tprint {typeprint} forall (}) tprint
	}{ % else
	    ([) tprint {typeprint} forall (]) tprint
	} ifelse
    }{ % else
	pop (-array- ) tprint
    } ifelse
} readonly def
/packedarraytype { % def
    dup rcheck { % ifelse
	dup xcheck { % ifelse
	    ({) tprint {typeprint} forall (}) tprint
	}{ % else
	    ([) tprint {typeprint} forall (]) tprint
	} ifelse
    }{ % else
	pop (-packedarray- ) tprint
    } ifelse
} readonly def
/courier /Courier findfont 10 scalefont def
/OLDhandleerror where not { % to allow overloading
 /OLDhandleerror errordict /handleerror get def
}{pop} ifelse % to allow overloading
end % $brkpage

% read lines terminated by EITHER newline or return
% (to deal with brain-damage of AppleTalk connection)

/readsafeline{ % def
    dup length exch 0
    { % loop
    	3 index read
	{ % ifelse
	    dup 10 eq 1 index 13 eq or 
	    { % ifelse
	        pop 
		0 exch getinterval exch pop exch pop 
		true exit % normal exit
	    }{ % ifelse
		3 index 2 index le 
		{  % ifelse
		    pop pop exch pop exch pop true
		    stop % rangecheck long line
		}{ % ifelse
		    3 copy put pop 1 add
		} ifelse
	    } ifelse
	}{ % ifelse
	    0 exch getinterval exch pop exch pop 
	    false exit % EOF exit
	} ifelse
    } loop
} def

% Find name for dictionary in tree of dictionaries - ignore font dictionaries
% Discard intermediate dictionary info - return first match

/lookfordict { % name and dict to search
 dup % save for self reference detection
 { % forall
  dup type /dicttype eq
   { % is a dictionary
    dup 3 index ne
     { % not self reference
      1 index /unknowndict ne
       { % not the place we saved
	dup unknowndict eq
	 { % found it
	  pop 3 1 roll pop pop true exit % return name and true
	 }{ % not the unknown dict
	  dup rcheck
	  { % safe to read
	   1 index /FontDirectory ne 
	   { % not Font Directory 
	    lookfordict % recurse
	    { % found it
	     3 1 roll pop pop true exit % return name and true
	    }{
	     0 0 % replace key and value
	    } ifelse % lookfordict
	  } if % FontDirectory 
	} if % safe to read
       } ifelse % equals unknown
      } if % place we hid dict
     } if % self reference
    } if % is a dictionary
  pop pop % flush key and value
 } forall
 dup true ne {pop pop false} if % flush name and dictionary 
} readonly def

/namedict{ % get name for dictionary 
	dup systemdict eq {/systemdict}
	{/unknowndict exch def % store unknown dictionary
	 /systemdict dup load lookfordict not {/-no-name-} if} ifelse
} readonly def

/handleerror { % put
    systemdict begin $error begin $brkpage begin
    newerror { % ifelse
	errorname /timeout ne { 
	{			
	/newerror false store
	vmstatus % pop pop
	3 -1 roll
	0 ne {grestoreall} if	% free up some VM is possible
	initgraphics courier setfont
	lmargin 720 moveto 
 	exch sub 4096 lt {stop} if % nearly out of VM ?
	statusdict /jobname known { % if
	    statusdict /jobname get dup type /stringtype eq {
		nl (JOBNAME: ) prnt
		prnt nl
	   } {pop} ifelse
	} if
	nl (ERROR: ) prnt
	errorname prnt nl
	nl (OFFENDING COMMAND: ) prnt
	/command load prnt
	$error /ostack known { % if
	    nl nl (OPERAND STACK:) prnt nl nl
	    $error /ostack get aload length {==} repeat
	} if
	$error /estack known { % if
	    nl nl (TOP OF EXECUTION STACK:) prnt nl nl
	    $error /estack get aload length 
	    true exch 
	    {dup {1 index == 1 index type cvlit /filetype eq {not} if} if
	    exch pop} repeat pop % avoid system stuff
	} if
	$error /dstack known { % if
	    nl nl (DICTIONARY STACK:) prnt nl nl
	    $error /dstack get aload length {namedict cvx ==} repeat
	} if
	systemdict /file known 
	{ % if
	    nl nl (FILE STREAM:) prnt nl nl
	    true 7 
	    { % repeat
	    	(%stdin) (r) file =string {readsafeline} stopped
		{
			pop (long line:\n) prnt =string prnt nl
		}{
			{
				prnt nl
			}{
				prnt nl (EOF) prnt nl nl pop false exit
			} ifelse
		}  ifelse
	    } repeat
	    {3 {(.) prnt nl} repeat nl} if
	} if
	showflag{/#copies 1 def systemdict /showpage get exec}if
	/newerror true store
	/OLDhandleerror load end end end exec
	} stopped {
		nl nl (VMError (or error in error handler)) prnt nl
		nl (ERROR: ) prnt	%
		errorname prnt nl	%
		nl (OFFENDING COMMAND: ) prnt
		/command load prnt nl	%
		showflag{/#copies 1 def systemdict /showpage get exec}if
		/newerror true store
		/OLDhandleerror load end end end exec
		} if %% get some output at least if handler dies
      } if % ignore timeout
    }{ % else already in error handler ...
	end end end
%%	systemdict /showpage get exec %% get some output if internal error ?
    } ifelse
}
dup 0 systemdict put % replace name by actual dict object
dup 4 $brkpage put   % replace name by dict object
bind readonly

errordict 3 1 roll put % put proc in errordict as /handleerror

${this.title}

Code Editor : ehandler.ps