On Wed, 2002-10-09 at 23:06, Antonio Gallardo Rivera wrote:
> Why try to reinvent the wheel?
did you guys get something wrong here?
>
> We already have XPath. Why use it? Because its like all computer related thing
> teached us for years. Everybody know that ".." means parent.
but the question is - what means child?
"../" is well known in xpath as well as in filesystems for being "one
level up". So what would be the syntax for "one level down" then? AFAICS
there is none for a filesystem. the closest would be "/*/*/*/1" as xpath
syntax. but actually the (virtual) tree of matcher/action results is
level1
+-1
+-2
|
+-level2
+-1
+-2
+-3
|
for something like this:
<map:match pattern="**.*">
<map:match pattern="**/*.*">
...
so adressing the results absolute would be
/level1/1
/level1/level2/2
which could be written as /*/1 and /*/*/1 or (since we always start with
level1) to /1 and /*/1. which in turn could be reduced to /1 and //2.
admittingly {////1} is not very expressive but should be not too hard to
grasp. as I said: it was my first guess... and I asked for comments. but
please be a little more constructive then "it's really poor". next time
please come up with a better syntax ;)
I must admit that I am not really in favor of Ilya's proposal because it
will virtually flatten the variable tree and will give problems with
variable name clashes. as well is the {bla:something} syntax already
used by the InputModules.
but I also not very clear myself it is really necessary or useful. an
example would be:
<map:match pattern="**.html">
<map:act type="..">
<map:act type="..">
<map:generate src="{//fromfirstaction"/>
</map:act>
<map:generate src="{//fromfirstaction"/>
the absolute refering of the result of the first action would save you
from counting the levels for each position where you want to use the
variable.
<map:match pattern="**.html">
<map:act type="..">
<map:act type="..">
<map:generate src="{../fromfirstaction"/>
</map:act>
<map:generate src="{fromfirstaction"/>
and as soon as you surround a subtree of the pipeline (insert another
act e.g.) you currently have to add a "../" on each use of a variable
from the parent tree.
cheers
--
Torsten
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