On Wed, Nov 6, 2013 at 7:24 PM, Edward K. Ream <[email protected]> wrote:
>
> > I've hacked away on Brian's script. This has been a lot of fun.
>
> The old way of generating selectors was:
>
> table = (
> # bits: dirty=8,clone=4,mark=2,body=1.
> (0,'leaf'),
> (1,'body'),
> (2,'mark'),
> (3,'mark-body'),
> (4,'clone'),
> (5,'clone-body'),
> (6,'clone-mark'),
> (7,'clone-mark-body'),
> (8,'dirty'),
> (9,'dirty-body'),
> (10,'dirty-mark'),
> (11,'dirty-mark-body'),
> (12,'dirty-clone'),
> (13,'dirty-clone-body'),
> (14,'dirty-clone-mark'),
> (15,'dirty-clone-mark-body'),
> )
> boxes_css = '\n'.join([
> 'li.%s {\n background-image: url(%s)\n}' %
> (kind,icon('box%02d.GIF' % (n)))
> for n,kind in table])
>
> But this is bad style. It is error prone and hides the essential
> relationships in the box naming.
>
Otoh, it's pretty clear what is going on ;-)
>
> In contrast, the following shows that icons are named in a specific manner.
>
> def selector(n):
> table = ((8,'dirty'),(4,'clone'),(2,'mark'),(1,'body'))
> return '-'.join([s for n2,s in table if n & n2]) or 'leaf'
>
>
>
>
> def css(n):
> return 'li.%s {\n background-image: url(%s)\n}' % (
> selector(n),icon('box%02d.GIF' % n))
>
> boxes_css = '\n'.join([css(n) for n in range(15)])
>
> The table in the selector function makes the bits explicit: the dirty bit
> is the 8 bit, and so on.
>
It can be made clearer if we define::
def box(n):
return icon('box%02d.GIF' % n)
Then the css function is::
def css(n):
return 'li.%s {\n background-image: url(%s)\n}' % (
selector(n),box(n))
Oh well, it's a minor matter.
Edward
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