[REBOL] Re: Binding problem with 'do
From: tim:johnsons-web at: 1-Aug-2005 7:24
* Anton Rolls <[antonr--lexicon--net]> [050801 01:38]:
> Hi Tim,
>
> Your code below seems to be generating code using a macro.
> It seems extremely unwieldy to me and needs a clever
> bit of rebol to shrink it to its essence.
>
> What are the changing parts (what value and type are they) ?
>
> It looks to me like the changing parts are:
>
> - widget style
> - widget feel
>
> where the feel is just used to detect different key presses (?)
>
> I would love to know the intention of your code so we
> can refactor it.
<grin> We just did. We refactored it in rebol. Yes. python
is cumbersome, but it scales well, and some
customers want it. Even the code below could be
factored more. FI: dispatch should be a method
of kblists...
tim
> Anton.
>
> > # Example: explicit
> > def do_sql(name,layout):
> > dispatch = {
> > 'radio':kbLists.do_sql_radio(),
> > 'text':kbLists.do_sql_text(),
> > 'textarea':kbLists.do_sql_textarea(),
> > 'decimal':kbLists.do_sql_decimal(),
> > 'uinteger':kbLists.do_sql_uinteger(),
> > 'select':kbLists.do_sql_select(),
> > 'date':kbLists.do_sql_date(),
> > 'checkbox':kbLists.do_sql_checkbox(),
> > 'password':kbLists.do_sql_text(),
> > }
> > return ' %s %s,' % (name,dispatch[layout['type']])
to elaborate: python automagically builds in internal dictionary
with the declared class members. Among other things, it allows
testing for validity of keyword values...
thus the 'for item in keys' test loop.
> > # Example: using builtin _dict_ in class constructor
> > def __init__(self, url='', text='', **kw):
> > self.target = None
> > self.onClick = None
> > self.onMouseOver = None
> > self.onMouseOut = None
> > self.url = url
> > self.text = text
> > # target ... text constitutue self.__dict__ when they are
> > # preceded by 'self.'
> > for item in kw.keys():
> > if self.__dict__.has_key(item):
> > self.__dict__[item] = kw[item]
> > else:
> > raise KeyError, `item`+' not a valid parameter
> > for this class.'
>
> --
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--
Tim Johnson <[tim--johnsons-web--com]>
http://www.alaska-internet-solutions.com
