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<A HREF="intro.html"><FONT COLOR="#FFFFFF">1 Introduction</FONT></A><BR>
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<A HREF="parser.html"><FONT COLOR="#FFFFFF">4 Parser</FONT></A><BR>
<A HREF="analyser.html"><FONT COLOR="#FFFFFF">5 Analyser</FONT></A><BR>
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<P><FONT SIZE="5">5 Analyser</FONT><BR>
<P>The effect of the parser is to construct a macro table
containing a representation of all the macros defined within
the document, and a document list which contains a complete
representation of the entire document. If there are no error
diagnostics (or worse) at the end of the parser run,
FunnelWeb invokes the analyser which tests for the following
conditions and flags them with errors if they arise.
<P>
<UL>
<LI> No macros defined in the input file.
<LI> No macros connected to output files.
<LI> Call of an undefined macro.
<LI> Call having the wrong number of parameters.
<LI> Call of a macro that is connected to an output file.
<LI> No calls made to a macro without the <SAMP>@Z</SAMP> option.
<LI> More than one call made to a macro without the <SAMP>@M</SAMP> option.
<LI> Directly or indirectly recursively defined macros.
<LI> Unnamed sections that contain no macro definitions.
</UL>
<P>FunnelWeb performs a static
analysis to detect
recursion. Unfortunately, the
recursion detection algorithm flags all macros that have an
infinite expansion rather than just all macros with a
recursive definition. If A calls B, and B calls C, and C
calls B, then FunnelWeb will flag A as well as B and C. It
is hoped that this problem will be fixed in a later version.
<P>Because FunnelWeb does not provide any kind of
conditional feature, the prevention of recursion does not
represent a curtailment of expressive power.
<P>Macros may be invoked recursively, but may not be
recursive. Thus:
<P>
<PRE>
@! LEGAL recursive invocation.
@<Sloth@>@(@<Sloth@>@(Walrus@)@)
@! ILLEGAL recursive definition.
@$@<Teapot@>==@{@<Teapot@>@}
</PRE>
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