1.5 Typesetter Independence
1.5 Typesetter Independence
One of the design goals of FunnelWeb was to provide a
target language independent
  literate programming system.
This goal has been achieved simply by treating the text written
to the product file as homogeneous and typesetting it in tt font.
A secondary goal was to provide a 
typesetter independent
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
1 Introduction
also been achieved.
2 Interface
3 Scanner
The difficulty with providing typesetter independent typesetting
4 Parser
is that each desired typesetting feature must be recreated in a
5 Analyser
typesetter independent FunnelWeb typesetting construct that
FunnelWeb can translate into whatever typesetting language is
6 Tangle
being targeted by Weave. Taken to the extreme, this would
7 Weave
result in FunnelWeb providing the full syntactic and semantic
8 Shell
power of TeX, but with a more generic, FunnelWeb specific
9 Commands
syntax. This was unfeasible in the time available, and
10 Glossary
undesirable as well.
11 References
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 
. 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
" 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.
This said, experience with FunnelWeb, over more than a
decade, indicates that the typesetting facilities provided by
FunnelWeb are sufficient for most documentation.
Copyright   Ross N. Williams 1992,1999. All rights
http://www.ross.net/funnelweb/reference/intro_typesetter.html (1 of 2) [3/3/2000 10:49:37 PM]

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