Need general guidelines and book suggestions

We are developing software which will offer a wide range of data
processing functions for hydrological and meteorological time series; we
are currently at the stage of software requirements definition. It would
be very good if the software contained a simple programming language
with which the user would create more sophisticated functions based on
the existing ones, and thus be able to customize the software to her
needs.


The problem is that we do not have any such experience, and are, at
present, unable even to decide upon feasibility. We are currently
examining the possibilities of lex and yacc, but I think that the parser
is only one part of the problem; we don't know how the interpreter would
interact with the rest of our application. We need an introduction to
the architecture of such systems, not too theoretical; we know or we can
find information on theory of compiler architecture. What would suit us
best would be a book specialized on how to design an application in
which the programming language is an accessory, such as it is in MS
Excel, MS Word and AutoCAD. Do you know of any similar book or have any
site to suggest?


I'd also like to know what PCCTS is and where it is used.


Thanks a lot for the help.
[I'd suggest that rather than inventing yet another extension language,
you look at tcl and python, freely available languages that you can embed
in your application. -John]
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