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\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{doi}[2007/07/24 handle doi numbers]
%% This style file is based original code written by Heiko Oberdiek
%% and published on comp.text.tex. It was packaged with permission
%% as a style file by Maarten Sneep, with some minor changes suggested
%% by Bruno Voisin to accomodate the Apple pdf framework
%%
%% This code is placed under the LPPL.
%%
%% Original discussion on Google under:
%% http://groups.google.com/group/comp.text.tex/msg/922919daa207d613
%%
%% You can hyperlink DOI numbers to dx.doi.org. Some publishers have elected to
%% use some nasty characters in their doi numbering scheme (<, >, ; have all
%% been spotted). This will either upset (La)TeX, or your pdf reader. This style
%% file contains a user-level command \doi{}, which takes a doi number,
%% and creates a hyperlink from it. The format of the doi can be controlled by
%% redefining the \doitext command, which does not take an argument (unlike the
%% command with the same name in the doipubmed package).
%%
%% Note: the \doi{} command connot be used within other macros.
%% Change history:
%% December 15, 2003: original code posted on Usenet (see link above)
%% Somewhere in 2005: Bruno Voisin suggests some changes to accomodate the
%% Apple pdf framework on the Tex on Mac OS X mailing list.
%% April 2007: Maarten packages the lot, and Karl Ove Hufthammer fixes a
%% few bugs introduced by Maarten (oops).
%% A \doitext command is added, following the example from doipubmed.
%% Some comments are added to make the code a little more readable.
%% July 2007: Michael Orlov sends in a patch to correctly handle underscores.
%% We need hyperref, but you probably want to load hyperref
%% beforehand, or set some options later on.
\RequirePackage{hyperref}
%% to change the default prefix, redefine this command within your own code.
%% It takes no argument, which is different from the doipubmed package.
\newcommand{\doitext}{doi:}
%% the meat of the code
%% the first command opens a group, and changes a few catcodes.
\newcommand*{\doi}{%
\begingroup
\lccode`\~=`\#\relax
\lowercase{\def~{\#}}%
\lccode`\~=`\_\relax
\lowercase{\def~{\_}}%
\lccode`\~=`\<\relax
\lowercase{\def~{\textless}}%
\lccode`\~=`\>\relax
\lowercase{\def~{\textgreater}}%
\lccode`\~=0\relax
\catcode`\#=\active
\catcode`\_=\active
\catcode`\<=\active
\catcode`\>=\active
\@doi
}
%% this is the actual command which processes the argument, with the catcodes
%% set in the previous command
%% it closes the group, and spits out the url.
\def\@doi#1{%
\let\#\relax
\let\_\relax
\let\textless\relax
\let\textgreater\relax
\edef\x{\toks0={{#1}}}%
\x
\edef\#{\@percentchar23}%
\edef\_{_}%
\edef\textless{\@percentchar3C}% instead of {\string<} for Apple
\edef\textgreater{\@percentchar3E}% instead of {\sting>} for Apple
\edef\x{\toks1={\noexpand\href{http://dx.doi.org/#1}}}%
\x
\edef\x{\endgroup\doitext\the\toks1 \the\toks0}%
\x
}
%% that's all folks.
\endinput
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