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% Copyright 2019 by Till Tantau
%
% 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 doc/generic/pgf/licenses/LICENSE for more details.
\ProvidesFileRCS{pgfsysprotocol.code.tex}
% This package provides the pgf system protocol layer. Protocolling is
% used to record a bunch of graphic operations so that they can be
% reused quickly at a later point.
%
% Basically, all ``recordable'' \pgfsys@xxxx commands call
% \pgfsysprotocol@protocol for their protocolable literal
% specials. The literal text will either be stored in the current
% protocol. At a later point (actually, normally this happens
% immediately afterwards), the accumulated protocolled text is invoked
% using pgfsys@invokeprotocol.
\let\pgfsysprotocol@currentprotocol=\pgfutil@empty
\newif\ifpgfsysprotocol@buffered
% Add to the protocol buffered
\def\pgfsysprotocol@literalbuffered#1{%
\edef\pgfsysprotocol@temp{{#1\space}}%
\expandafter\pgfutil@g@addto@macro\expandafter\pgfsysprotocol@currentprotocol\pgfsysprotocol@temp%
}
% Add to the protocol
\def\pgfsysprotocol@literal#1{%
\pgfsysprotocol@literalbuffered{#1}%
\ifpgfsysprotocol@buffered%
\else%
\pgfsysprotocol@flushcurrentprotocol%
\fi%
}
% Getting and setting the current protocol
\def\pgfsysprotocol@getcurrentprotocol#1{%
\let#1=\pgfsysprotocol@currentprotocol%
}
\def\pgfsysprotocol@setcurrentprotocol#1{%
\global\let\pgfsysprotocol@currentprotocol=#1%
}
% Invoking the current protocol
\def\pgfsysprotocol@invokecurrentprotocol{%
\ifx\pgfsysprotocol@currentprotocol\pgfutil@empty%
\else%
\expandafter\pgfsys@invoke\expandafter{\pgfsysprotocol@currentprotocol}%
\fi%
}
\def\pgfsysprotocol@flushcurrentprotocol{%
\pgfsysprotocol@invokecurrentprotocol%
\pgfsysprotocol@setcurrentprotocol\pgfutil@empty%
}
\endinput
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