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% Copyright 2003--2007 by Till Tantau
% Copyright 2010 by Vedran Mileti\'c
% Copyright 2015 by Vedran Mileti\'c, Joseph Wright
% Copyright 2017,2018 by Louis Stuart, Joseph Wright
%
% This file may be distributed and/or modified
%
% 1. under the LaTeX Project Public License and/or
% 2. under the GNU Public License.
%
% See the file LICENSE.md for more details.
% To track which slide we are on in a frame
\newcount\beamer@slideinframe
\newcount\beamer@minimum
% Indicate whether another slide needs to be processed in this frame
\newif\ifbeamer@anotherslide
\newif\ifbeamer@localanotherslide
% Used to know that beamerpauses needs to be used in substitution
\newif\ifbeamer@plusencountered
% The main decoding macro tolerates a range of active characters, which
% require a little set up. In particular, as an active space is allowed
% all of the lines here have to be terminated with "%". The two-step
% setup for \beamer@@@temp makes sure everything is expanded and removes
% all of the spaces at this stage.
\newbox\beamer@decode@box
\begingroup
\catcode`\|=\active
\catcode`\:=\active
\catcode`\,=\active
\catcode`\.=\active
\catcode`\+=\active
\catcode`\-=\active
\catcode`\(=\active
\catcode`\)=\active
\catcode`\ =\active
\xdef\beamer@masterdecode#1{%
\noexpand\beamer@localanotherslidefalse%
\setbox\beamer@decode@box=\hbox{%
\unexpanded{%
\ifnum\catcode`\|=\active\edef|{\string|}\fi%
\ifnum\catcode`\:=\active\edef:{\string:}\fi%
\ifnum\catcode`\,=\active\edef,{\string,}\fi%
\ifnum\catcode`\.=\active\edef.{\string.}\fi%
\ifnum\catcode`\+=\active\edef+{\string+}\fi%
\ifnum\catcode`\-=\active\edef-{\string-}\fi%
\ifnum\catcode`\(=\active\edef({\string(}\fi%
\ifnum\catcode`\)=\active\edef){\string)}\fi%
\ifnum\catcode`\ =\active\edef {\string }\fi}%
\edef\noexpand\beamer@@@temp{#1\string|stop\string:0\string|}%
\edef\noexpand\beamer@@@temp{\unexpanded{\expandafter\zap@space\beamer@@@temp}%
\space\noexpand\@empty}%
\unexpanded{\expandafter\beamer@decode\beamer@@@temp%
\ifbeamer@localanotherslide\aftergroup\beamer@localanotherslidetrue\fi}%
}%
}%
\endgroup
% Sets dowhat to doif, if \beamer@slideinframe is in the specified
% interval. Example: 5-7,-3,9,11,13- would mean pages
% 1,2,3,5,6,7,9,11,13,14,15,16,...
%
% As a side effect, \@another is called whenever the there is a number
% in the list that is larger than the current serialnumber
\def\beamer@allsign{*}
% The main decoding routine starts by initialising the starting a search
% for everything up to "|": to allow for the simple case of overlays in
% slides for presentations there is a need to insert "beamer:". Notice
% that \beamer@@decodefind may be called multiple times, hence being set
% up as an auxiliary.
\def\beamer@decode{%
\beamer@plusencounteredfalse
\global\beamer@minimum=10000\relax
\gdef\beamer@decaction{}%
\global\let\beamer@decodefound=\beamer@allsign
\beamer@@decodefind}
\def\beamer@@decodefind#1|{\beamer@@@decodefind#1:|}
\def\beamer@@@decodefind#1:#2|{%
\ifblank{#2}%
{\beamer@decodefind beamer:#1:}%
{\beamer@decodefind #1:#2}}
% A list of possible overlay modes
\def\beamer@default{default}
\def\beamer@articlemode{article}
\def\beamer@secondmode{second}
\def\beamer@beamermode{beamer}
\def\beamer@presentationmode{presentation}
\def\beamer@modeall{all}
\def\beamer@ovmodestop{stop}
% The main parsing function for each sub-part starts by splitting at any
% "@" and then checking the spec for various cases: keywords, "+", ".".
% After that, there is some cleanup to do before potentially looping.
\def\beamer@decodefind#1:#2:{%
\def\beamer@ovmode{#1}%
\beamer@decodeaction{#2}%
\expandafter\futurelet\expandafter\next\expandafter
\beamer@checkcat\beamer@spec:%
\expandafter\beamer@decodeplus\beamer@spec+:%
\expandafter\beamer@decodedot\beamer@spec.:%
\ifx\beamer@ovmode\beamer@ovmodestop
\expandafter\beamer@@decode\beamer@decodefound,!%
\let\beamer@next=\relax
\ifbeamer@plusencountered\stepcounter{beamerpauses}\fi
\else
\ifx\beamer@ovmode\beamer@currentmode
\beamer@@decodefound
\else
\ifx\beamer@ovmode\beamer@modeall
\beamer@@decodefound
\else
\ifx\beamer@ovmode\beamer@presentationmode
\ifx\beamer@currentmode\beamer@articlemode
\else
\beamer@@decodefound
\fi
\else
\ifx\beamer@ovmode\beamer@beamermode
\ifx\beamer@currentmode\beamer@secondmode
\beamer@@decodefound
\fi
\fi
\fi
\fi
\fi
\let\beamer@next=\beamer@@decodefind
\fi
\beamer@next}
% The aim here is to find any "<action>@" spec, and to split it off the
% action from the rest. That uses a pretty stand search approach.
\edef\beamer@decodeaction#1{%
\noexpand\beamer@@decodeaction#1\string @\string @:}
\begingroup
\edef\beamer@@@temp{%
\endgroup
\def\noexpand\beamer@@decodeaction##1\string @##2\string @##3:{%
\noexpand\ifblank{##2}%
{%
\def\noexpand\beamer@action{default}%
\def\noexpand\beamer@spec{##1}%
}%
{%
\def\noexpand\beamer@action{##1}%
\def\noexpand\beamer@spec{##2}%
}%
}%
}%
\beamer@@@temp
% Search for the case where the specification is a keyword, and if it
% is set the overlay mode and spec.
\def\beamer@checkcat#1:{%
\ifcat\next a%
\gdef\beamer@ovmode{#1}%
\ifx\beamer@decodefound\beamer@allsign
\gdef\beamer@decodefound{0}%
\fi
\def\beamer@spec{1-}%
\fi}
\def\beamer@decodeplus{%
\def\beamer@spec{}\beamer@@decodeplus}
\def\beamer@@decodeplus#1+#2:{%
\edef\beamer@spec{\beamer@spec#1}% everything up to a +
\ifblank{#2}{}
{% ok, check if followed by number:
\beamer@plusencounteredtrue
\beamer@@@decodeplus#2:}}
\def\beamer@@@decodeplus{%
\kernel@ifnextchar(%)
{\beamer@relnumber}{\beamer@relnumber(0)}}
\def\beamer@relnumber(#1){%
\beamer@plusencounteredtrue
\@tempcnta=\numexpr #1 + \value{beamerpauses}\relax%
\ifnum\@tempcnta<0\@tempcnta=0\fi%
\edef\beamer@spec
{\beamer@spec\number\@tempcnta}%
\beamer@@decodeplus}
\def\beamer@decodedot{%
\def\beamer@spec{}\beamer@@decodedot}
\def\beamer@@decodedot#1.#2:{%
\edef\beamer@spec{\beamer@spec#1}% everything up to first .
\ifblank{#2}{}{\beamer@@@decodedot#2:}}
\def\beamer@@@decodedot{%
\kernel@ifnextchar(%)
{\beamer@relnumberdot}{\beamer@relnumberdot(0)}}
\def\beamer@relnumberdot(#1){%
\@tempcnta=\numexpr #1 + \value{beamerpauses} -1\relax%
\ifnum\@tempcnta<0\@tempcnta=0\fi%
\edef\beamer@spec
{\beamer@spec\number\@tempcnta}%
\beamer@@decodedot}
\def\beamer@@decodefound{%
\ifx\beamer@action\beamer@default
\xdef\beamer@decodefound{\beamer@spec}%
\else
\xdef\beamer@decaction{\beamer@decaction{\beamer@action<\beamer@spec>}}%
\fi}
\def\beamer@currentaction{default}
\def\beamer@doifnotinframe{}
% A set of macros to deal with what can form the basis of an action
% spec once we know the basic shape: the key concepts are whether there
% are more slides to do and how many there are in total.
\def\beamer@@decode{%
\kernel@ifnextchar!%
{\beamer@decodeend}%
{%
\kernel@ifnextchar*%
{\beamer@decodeall}{%
\kernel@ifnextchar-%
{\beamer@decodeuntil}%
{\beamer@decodenumber}}}}
\def\beamer@decodeend!{}
\def\beamer@decodeall*,{%
\ifnum1<\beamer@minimum
\global\beamer@minimum=1\relax
\fi
\ifnum1>\beamer@slideinframe
\global\beamer@anotherslidetrue\beamer@localanotherslidetrue
\fi
\gdef\beamer@doifnotinframe{\beamer@doifinframe}%
\beamer@@decode}
\def\beamer@decodeuntil-#1,{%
\ifnum1<\beamer@minimum
\global\beamer@minimum=1\relax
\fi
\ifnum#1>\beamer@slideinframe
\global\beamer@anotherslidetrue\beamer@localanotherslidetrue
\fi
\ifnum\beamer@slideinframe>#1\relax
\else
\gdef\beamer@doifnotinframe{\beamer@doifinframe}%
\fi
\beamer@@decode}
\def\beamer@decodenumber#1{%
\kernel@ifnextchar,%
{\beamer@decodeone{#1}}%
{\kernel@ifnextchar-%
{\beamer@decodenumberto{#1}}%
{\beamer@decodegobble{#1}}}}
\def\beamer@decodegobble#1#2{%
\beamer@decodenumber{#1#2}}
\def\beamer@decodenumberto#1-{%
\kernel@ifnextchar,%
{\beamer@decodeto{#1}}%
{\beamer@decodebetween{#1}}}
\def\beamer@decodeto#1,{%
\ifnum#1<\beamer@minimum
\global\beamer@minimum=#1\relax
\fi
\ifnum#1>\beamer@slideinframe
\global\beamer@anotherslidetrue\beamer@localanotherslidetrue
\fi
\ifnum#1>\beamer@slideinframe
\else
\gdef\beamer@doifnotinframe{\beamer@doifinframe}%
\fi
\beamer@@decode}
\def\beamer@decodebetween#1#2,{%
\ifnum#1<\beamer@minimum
\global\beamer@minimum=#1\relax
\fi
\ifnum#1>\beamer@slideinframe
\global\beamer@anotherslidetrue\beamer@localanotherslidetrue
\fi
\ifnum#2>\beamer@slideinframe
\global\beamer@anotherslidetrue\beamer@localanotherslidetrue
\fi
\ifnum#1>\beamer@slideinframe
\else
\ifnum#2<\beamer@slideinframe
\else
\gdef\beamer@doifnotinframe{\beamer@doifinframe}%
\fi
\fi
\beamer@@decode}
\def\beamer@decodeone#1,{%
\ifnum#1<\beamer@minimum
\global\beamer@minimum=#1\relax
\fi
\ifnum#1>\beamer@slideinframe
\global\beamer@anotherslidetrue\beamer@localanotherslidetrue
\fi
\ifnum#1=\beamer@slideinframe
\gdef\beamer@doifnotinframe{\beamer@doifinframe}%
\fi
\beamer@@decode}
\def\beamer@donow{\beamer@doifnotinframe}
|
