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|
% \iffalse meta-comment
%
% Copyright (C) 2008 by Ulrich M. Schwarz
%
% This file may be distributed and/or modified under the conditions of
% the LaTeX Project Public License, version 1.3a.
% The license can be obtained from
% http://www.latex-project.org/lppl/lppl-1-3a.txt
%
% \fi
%
%\iffalse (hide this from DocInput)
%<*patch>
%\fi
%
% This package is maybe not very suitable for the end user. It redefines
% |\newtheorem| in a way that lets other packages (or the user) add code
% to the newly-defined theorems, in a reasonably cross-compatible (with
% the kernel, \pkg{theorem} and \pkg{amsthm}) way.
%
% \textbf{Warning:} the new |\newtheorem| is a superset of the allowed
% syntax. For example, you can give a star and both optional arguments,
% even though you cannot have an unnumbered theorem that shares a counter
% and yet has a different reset-regimen. At some point, your command is
% re-assembled and passed on to the original |\newtheorem|. This might
% complain, or give you the usual ``Missing |\begin{document}|'' that
% marks too many arguments in the preamble.
%
% \DescribeMacro{\addtotheorem(pre/post)(head/foot)hook}
% A call to |\addtotheorempreheadhook|\oarg{kind}\marg{code} will
% insert the code to be executed whenever a kind theorem is opened, before
% the actual call takes place. (I.e., before the header ``Kind 1.3 (Foo)''
% is typeset.) There are also posthooks that are executed after this header,
% and the same for the end of the environment, even though nothing
% interesting ever happens there. These are useful to put
% |\begin{shaded}|\dots |\end{shaded}| around your theorems.
% Note that foothooks are executed LIFO (last addition first) and headhooks
% are executed FIFO (first addition first). There is a special kind called
% generic that is called for all theorems. This is the default if no kind
% is given.
%
% The added code may examine |\thmt@thmname| to get the title,
% |\thmt@envname| to get the environment's name, and |\thmt@optarg| to get
% the extra optional title, if any.
%
%\StopEventually{}
% \begin{macrocode}
\RequirePackage{parseargs}
\newif\ifthmt@isstarred
\newif\ifthmt@hassibling
\newif\ifthmt@hasparent
\def\thmt@parsetheoremargs#1{%
\parse{%
{\parseOpt[]{\def\thmt@optarg{##1}}{%
\let\thmt@shortoptarg\@empty
\let\thmt@optarg\@empty}}%
{%
\def\thmt@local@preheadhook{}%
\def\thmt@local@postheadhook{}%
\def\thmt@local@prefoothook{}%
\def\thmt@local@postfoothook{}%
\thmt@local@preheadhook
\csname thmt@#1@preheadhook\endcsname
\thmt@generic@preheadhook
% change following to \@xa-orgy at some point?
% forex, might have keyvals involving commands.
%\protected@edef\tmp@args{%
% \ifx\@empty\thmt@optarg\else [{\thmt@optarg}]\fi
%}%
\ifx\@empty\thmt@optarg
\def\tmp@args{}%
\else
\@xa\def\@xa\tmp@args\@xa{\@xa[\@xa{\thmt@optarg}]}%
\fi
\csname thmt@original@#1\@xa\endcsname\tmp@args
%%moved down: \thmt@local@postheadhook
%% (give postheadhooks a chance to re-set nameref data)
\csname thmt@#1@postheadhook\endcsname
\thmt@generic@postheadhook
\thmt@local@postheadhook
\let\@parsecmd\@empty
}%
}%
}%
\let\thmt@original@newtheorem\newtheorem
\let\thmt@theoremdefiner\thmt@original@newtheorem
\def\newtheorem{%
\thmt@isstarredfalse
\thmt@hassiblingfalse
\thmt@hasparentfalse
\parse{%
{\parseFlag*{\thmt@isstarredtrue}{}}%
{\parseMand{\def\thmt@envname{##1}}}%
{\parseOpt[]{\thmt@hassiblingtrue\def\thmt@sibling{##1}}{}}%
{\parseMand{\def\thmt@thmname{##1}}}%
{\parseOpt[]{\thmt@hasparenttrue\def\thmt@parent{##1}}{}}%
{\let\@parsecmd\thmt@newtheoremiv}%
}%
}
\newcommand\thmt@newtheoremiv{%
\thmt@newtheorem@predefinition
% whee, now reassemble the whole shebang.
\protected@edef\thmt@args{%
\@nx\thmt@theoremdefiner%
\ifthmt@isstarred *\fi
{\thmt@envname}%
\ifthmt@hassibling [\thmt@sibling]\fi
{\thmt@thmname}%
\ifthmt@hasparent [\thmt@parent]\fi
}
\thmt@args
\thmt@newtheorem@postdefinition
}
\newcommand\thmt@newtheorem@predefinition{}
\newcommand\thmt@newtheorem@postdefinition{%
\let\thmt@theoremdefiner\thmt@original@newtheorem
}
\g@addto@macro\thmt@newtheorem@predefinition{%
\@xa\thmt@providetheoremhooks\@xa{\thmt@envname}%
}
\g@addto@macro\thmt@newtheorem@postdefinition{%
\@xa\thmt@addtheoremhook\@xa{\thmt@envname}%
\ifthmt@isstarred\@namedef{the\thmt@envname}{}\fi
\protected@edef\thmt@tmp{%
\def\@nx\thmt@envname{\thmt@envname}%
\def\@nx\thmt@thmname{\thmt@thmname}%
}%
\@xa\addtotheorempreheadhook\@xa[\@xa\thmt@envname\@xa]\@xa{%
\thmt@tmp
}%
}
\newcommand\thmt@providetheoremhooks[1]{%
\@namedef{thmt@#1@preheadhook}{}%
\@namedef{thmt@#1@postheadhook}{}%
\@namedef{thmt@#1@prefoothook}{}%
\@namedef{thmt@#1@postfoothook}{}%
\def\thmt@local@preheadhook{}%
\def\thmt@local@postheadhook{}%
\def\thmt@local@prefoothook{}%
\def\thmt@local@postfoothook{}%
}
\newcommand\thmt@addtheoremhook[1]{%
% this adds two command calls to the newly-defined theorem.
\@xa\let\csname thmt@original@#1\@xa\endcsname
\csname#1\endcsname
\@xa\renewcommand\csname #1\endcsname{%
\thmt@parsetheoremargs{#1}%
}%
\@xa\let\csname thmt@original@end#1\@xa\endcsname\csname end#1\endcsname
\@xa\def\csname end#1\endcsname{%
% these need to be in opposite order of headhooks.
\csname thmtgeneric@prefoothook\endcsname
\csname thmt@#1@prefoothook\endcsname
\csname thmt@local@prefoothook\endcsname
\csname thmt@original@end#1\endcsname
\csname thmt@generic@postfoothook\endcsname
\csname thmt@#1@postfoothook\endcsname
\csname thmt@local@postfoothook\endcsname
}%
}
\newcommand\thmt@generic@preheadhook{\refstepcounter{thmt@dummyctr}}
\newcommand\thmt@generic@postheadhook{}
\newcommand\thmt@generic@prefoothook{}
\newcommand\thmt@generic@postfoothook{}
\def\thmt@local@preheadhook{}
\def\thmt@local@postheadhook{}
\def\thmt@local@prefoothook{}
\def\thmt@local@postfoothook{}
\providecommand\g@prependto@macro[2]{%
\begingroup
\toks@\@xa{\@xa{#1}{#2}}%
\def\tmp@a##1##2{##2##1}%
\@xa\@xa\@xa\gdef\@xa\@xa\@xa#1\@xa\@xa\@xa{\@xa\tmp@a\the\toks@}%
\endgroup
}
\newcommand\addtotheorempreheadhook[1][generic]{%
\expandafter\g@addto@macro\csname thmt@#1@preheadhook\endcsname%
}
\newcommand\addtotheorempostheadhook[1][generic]{%
\expandafter\g@addto@macro\csname thmt@#1@postheadhook\endcsname%
}
\newcommand\addtotheoremprefoothook[1][generic]{%
\expandafter\g@prependto@macro\csname thmt@#1@prefoothook\endcsname%
}
\newcommand\addtotheorempostfoothook[1][generic]{%
\expandafter\g@prependto@macro\csname thmt@#1@postfoothook\endcsname%
}
% \end{macrocode}
% Since rev1.16, we add hooks to the proof environment as well, if it exists.
% If it doesn't exist at this point, we're probably using ntheorem as
% backend, where it goes through the regular theorem mechanism anyway.
% \begin{macrocode}
\ifx\proof\endproof\else% yup, that's a quaint way of doing it :)
% FIXME: this assumes proof has the syntax of theorems, which
% usually happens to be true (optarg overrides "Proof" string).
% FIXME: refactor into thmt@addtheoremhook, but we really don't want to
% call the generic-hook...
\let\thmt@original@proof=\proof
\renewcommand\proof{%
\thmt@parseproofargs%
}%
\def\thmt@parseproofargs{%
\parse{%
{\parseOpt[]{\def\thmt@optarg{##1}}{\let\thmt@optarg\@empty}}%
{%
\thmt@proof@preheadhook
%\thmt@generic@preheadhook
\protected@edef\tmp@args{%
\ifx\@empty\thmt@optarg\else [\thmt@optarg]\fi
}%
\csname thmt@original@proof\@xa\endcsname\tmp@args
\thmt@proof@postheadhook
%\thmt@generic@postheadhook
\let\@parsecmd\@empty
}%
}%
}%
\let\thmt@original@endproof=\endproof
\def\endproof{%
% these need to be in opposite order of headhooks.
%\csname thmtgeneric@prefoothook\endcsname
\thmt@proof@prefoothook
\thmt@original@endproof
%\csname thmt@generic@postfoothook\endcsname
\thmt@proof@postfoothook
}%
\@namedef{thmt@proof@preheadhook}{}%
\@namedef{thmt@proof@postheadhook}{}%
\@namedef{thmt@proof@prefoothook}{}%
\@namedef{thmt@proof@postfoothook}{}%
\fi
% \end{macrocode}
%\iffalse
%</patch>
%\fi
|
