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+\ProvidesFileRCS $Header: /cvsroot/pgf/pgf/generic/pgf/systemlayer/pgfsysprotocol.code.tex,v 1.1.1.1 2005/06/29 12:14:04 tantau Exp $
+
+% Copyright 2005 by Till Tantau <tantau@cs.tu-berlin.de>.
+%
+% This program can be redistributed and/or modified under the terms
+% of the GNU Public License, version 2.
+
+
+
+
+
+% This package provides the pgf system protcol 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=\@empty
+\newif\ifpgfsysprotocol@buffered
+
+
+% Add to the protocol buffered
+\def\pgfsysprotocol@literalbuffered#1{%
+ \edef\pgfsysprotocol@temp{{#1\space}}%
+ \expandafter\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\@empty%
+ \else%
+ \expandafter\pgfsys@invoke\expandafter{\pgfsysprotocol@currentprotocol}%
+ \fi%
+}
+
+\def\pgfsysprotocol@flushcurrentprotocol{%
+ \pgfsysprotocol@invokecurrentprotocol%
+ \pgfsysprotocol@setcurrentprotocol\@empty%
+}
+
+
+\endinput