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+%% $Id: xy.sty,v 3.3 1996/12/19 03:31:56 krisrose Exp $
+%%
+%% ``Xy-pic as LaTeX 2.09 style option and LaTeX 2e package''.
+%% Copyright (c) 1993-1996 Kristoffer H. Rose <krisrose@brics.dk>
+%%
+%% This file is part of the Xy-pic package for graphs and diagrams in TeX.
+%% See the companion README and INSTALL files for further information.
+%% Copyright (c) 1991-1996 Kristoffer H. Rose <krisrose@brics.dk>
+%%
+%% The Xy-pic package is free software; you can redistribute it and/or modify
+%% it under the terms of the GNU General Public License as published by the
+%% Free Software Foundation; either version 2 of the License, or (at your
+%% option) any later version.
+%%
+%% The Xy-pic package is distributed in the hope that it will be useful, but
+%% WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+%% or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+%% for more details.
+%%
+%% You should have received a copy of the GNU General Public License along
+%% with this package; if not, write to the Free Software Foundation, Inc.,
+%% 675 Mass Ave, Cambridge, MA 02139, USA.
+
+% Load Xy-pic with catcode of @ set as it will be in user text:
+\count255=\the\catcode`\@ {\catcode`\@=11 \xdef\xystycatcode{\the\count255}}
+\makeatletter
+
+% REPAIR bug of the 2e version of AMS-LaTeX where \makeatother is broken...
+\ifx\@ifpackageloaded\undefined \makeatother
+\else \@ifpackageloaded{amstex}{\catcode`\@=\active}{\makeatother}\fi
+
+\input xy
+
+% That is all unless this is called as a LaTeX2e `native mode' package. Is
+% there an official way to check this? Anyway, this seems to work:
+\makeatletter
+\ifx\if@compatibility\undefined \catcode`\@=\xystycatcode \endinput \fi
+
+% Ensure that we are *really* running LaTeX2e...!
+\NeedsTeXFormat{LaTeX2e}
+
+% This file provides the current version of Xy-pic!
+\edef\next{%
+ \noexpand\ProvidesPackage{xy}[\xydate\space Xy-pic version \xyversion]}\next
+
+% Recognise some standard LaTeX2e class options (cf. `LaTeX Companion' p.317):
+\DeclareOption{cmactex}{\xyoption{cmactex}}
+\DeclareOption{dvips}{\xyoption{dvips}\xyoption{ps}}
+\DeclareOption{dvitops}{\xyoption{dvitops}\xyoption{ps}}
+\DeclareOption{emtex}{\xyoption{emtex}}
+\DeclareOption{ln}{\xywarning@{`ln' DVI driver not yet fully supported}}
+\DeclareOption{oztex}{\xyoption{oztex}}
+\DeclareOption{textures}{\xyoption{textures}}
+\DeclareOption{xdvi}{\xyoption{xdvi}}
+
+% This is special:
+\DeclareOption{colour}{\xyoption{color}} % :-)
+
+% This (obsolete) cmtip style option should be activated after loading:
+\DeclareOption{cmtip}{\xyoption{cmtip}\UseComputerModernTips}
+
+% Pass the desired tip size if defined
+\DeclareOption{10pt}{\xywithoption{tips}{\def\tipsize@@{10}}}
+\DeclareOption{11pt}{\xywithoption{tips}{\def\tipsize@@{11}}}
+\DeclareOption{12pt}{\xywithoption{tips}{\def\tipsize@@{12}}}
+
+% Other options are just loaded.
+\DeclareOption*{\edef\next{\noexpand\xyoption{\CurrentOption}}\next}
+
+% Reinstall catcode of @...
+\catcode`\@=\xystycatcode
+
+% ... process the options, and that is all.
+\ProcessOptions
+
+\endinput
+
+% $Log: xy.sty,v $
+% Revision 3.3 1996/12/19 03:31:56 krisrose
+% Maintenance release
+%
+% Revision 3.1 1995/09/05 20:31:32 kris
+% Releasing!
+%
+% Revision 3.0 1995/07/07 20:14:21 kris
+% Major release w/new User's Guide!
+%
+% Revision 2.13 1995/07/04 15:11:17 kris
+% Ready to release v3?
+%
+% Revision 2.12 1994/10/25 11:34:25 kris
+% Interim release just before v3 [works with AMS-LaTeX 1.2]...
+%
+% Revision 2.9 1994/06/09 14:59:19 kris
+% Release 3beta.
+%
+% Revision 2.8 1994/04/08 04:30:00 kris
+% Second (bug fix) 3alpha release.
+%
+% Revision 2.7 1994/03/08 02:06:01 kris
+% Release 3alpha.
+%
+% New for version 2.7.