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<P><FONT SIZE="5">1.5 Typesetter Independence</FONT><BR>
<P>One of the design goals of FunnelWeb was to provide a
<I>target-language independent</I> literate programming
system. This goal has been achieved simply by treating the
text written to the product file as homogeneous and
typesetting it in <SAMP>tt font</SAMP>. A secondary goal was to
provide a <I>typesetter independent</I> literate
programming system. By this is meant that it be possible to
create FunnelWeb input files that do not contain
typesetter-specific commands. To a lesser extent this goal
has also been achieved.
<P>The difficulty with providing typesetter-independent
typesetting is that each desired typesetting feature must be
recreated in a typesetter-independent FunnelWeb typesetting
construct that FunnelWeb can translate into whatever
typesetting language is being targeted by Weave. Taken to
the extreme, this would result in FunnelWeb providing the
full syntactic and semantic power of TeX, but with a more
generic, FunnelWeb-specific syntax. This was unfeasible in
the time available, and undesirable as well.
<P>The compromise struck in the FunnelWeb design is to
provide a set of primitive typesetter-independent
typesetting features that are implemented by FunnelWeb.
These are the <STRONG>typesetter directives</STRONG>. If the
user is prepared to restrict to these directives, then the
user's FunnelWeb document will be both target-language and
typesetter independent. However, if the user wishes to use
the more sophisticated features of the target typesetting
system, the user can specify the typesetter in a
"<TT>typesetter</TT>" pragma and then place typesetter
commands in the free text of the FunnelWeb document where
they will be passed verbatim to the documentation file. The
choice of the trade-off between typesetter independence and
typesetting power is left to the user.
<P>This said, experience with FunnelWeb, over more than a
decade, indicates that the typesetting facilities provided by
FunnelWeb are sufficient for most documentation.
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