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Please note: This chapter is probably completely outdated!
This chapter discusses the language filter support in Form Designer, targeted primarily to the developers of bindings to other language. As of this writing, the authors are aware of the following bindings
ada95
by G. Vincent Castellano gvc@ocsystems.com
perl
by Martin Bartlett martin@nitram.demon.co.uk
Fortran
by G. Groten zdv017@zam212.zam.kfa-juelich.de and Anke Haeming A.Haeming@kfa-juelich.de
pascal
by Michael Van Canneyt michael@tfdec1.fys.kuleuven.ac.be
scm/guile
by Johannes Leveling Johannes.Leveling@Informatik.Uni-Oldenburg.DE
python
by Roberto Alsina ralsina@ultra7.unl.edu.ar. It would appear that author of python binding is no longer working on it.
These bindings are of varying degree of beta-ness and support. It appears to the authors that the most convenient and flexible way of getting output in the targeted language is through external filters that are invoked transparently by fdesign. This way, developers of the binding would have complete control over the translation of the default output from the fdesign to the target language and at the same time have the translation done transparently.
12.1 External Filters | ||
12.2 Command Line Arguments of the Filter |
An external filter is a stand-alone program that works on the output
of Form Designer and translates the output to the target language. The
filter can elect to work on the .fd
or the C output or both
simultaneously. However, in non-testing situations, the c output from
Form Designer probably should be deleted by the filter once the
translation is complete.
By default, Form Designer only outputs the .fd
and C files. If
the presence of -ada
, -perl
, -python
,
-fortran
, -pascal
or -scm
command line options to
Form Designer is detected, then after emitting the default output,
Form Designer invokes the the external filter with the root filename
(without the .fd
extension) as an argument, together with
possible other flags, to the filter. Any runtime error messages are
presented to the user in a browser. The filter name by default is
fd2xxxx
where xxxx
is the language name (such as
fd2perl
etc.), which can be changed using the -filter
command line option (or equivalent resources).
The resources that are relevant to the filter are listed below
Resource Type Default | ||
language | string | C |
filter | string | None |
Form Designer passes along the options that affect the output format to the filter. These options may or may not apply to the filter, most likely not if the filter works on the C file. For those that do not apply, the filter can simply ignore them, but shouldn't stop running because of these options.
-callback
callback stubs are generated
-main
main stub is generated
-altformat
output in alternate format
-compensate
emit size compensation code
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