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<H1>Tasks related to input processing</H1>
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<H1><A NAME="SEC2" HREF="input_toc.html#SEC2">Accessing the Current Token</A></H1>
<P>
This module provides a function <CODE>GetCurrTok</CODE> that can be used to
access the string of the current token read from input.
The function is used for example to access the name of a file to
be included if the switching computation is issued by the parser
as specified in the concrete grammar.
<P>
This module is instantiated without generic parameters by
<PRE>
$/Input/CurrTok.gnrc:inst
</PRE>
<P>
The signature of the function is
<DL COMPACT>
<DT><CODE>char *GetCurrTok (void)</CODE>
<DD>It accesses the string of the current token, stores it in memory,
and yields a pointer to the stored string as result.
</DL>
<P>
In our running example we could achieve the same effect of file
inclusion as described in (see <A HREF="input_1.html#SEC1">Insert a File into the Input Stream</A>), by specifying a computation
in the concrete grammar rather than in a <CODE>.lido</CODE> specification:
<P>
<PRE>
Declaration: 'include'
&'ChkFileOpnd(NewInput(GetCurrTok()), GetCurrTok());'
FileName ';'.
</PRE>
<A NAME="IDX17"></A>
The token of <CODE>FileName</CODE> that immediatly follows the computation
is accessed. The call of <CODE>ChkFileOpnd</CODE> is assumed to check
for success of the <CODE>NewInput</CODE> call.
<P>
<A NAME="IDX18"></A>
<A NAME="IDX19"></A>
<A NAME="IDX20"></A>
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