Thanks Matt!
I got the point!
Cheers
Mohammad
On Friday, April 5, 2019 at 6:16:12 PM UTC+4:30, Matthew Lauber wrote:
>
> Two filter runs sequentially means {result of filter run 1} followed by
> {result of filter run 2} (dominantly appended I believe) which isn't
> exactly the same as OR. The other thing is that [[]] isn't a false/invalid
> value, as far as filters are concerned. So, the list generated is "[[]]
> [[B]]" which are both valid inputs to the following filter run. And so
> [limit[1]] takes the first value passed to it, which is [[]].
>
> Matt
>
>
> On Friday, April 5, 2019 at 9:22:19 AM UTC-4, Mohammad wrote:
>>
>> Mat,
>> I expect the macro test1 returns B for test 3, becuase while a param is
>> empty but b has value and [[$a$]] [[$b$]] means OR
>> Am I right?
>>
>> --Mohammad
>>
>> On Friday, April 5, 2019 at 5:48:35 PM UTC+4:30, Matthew Lauber wrote:
>>>
>>> The difference is due to the enlist filter. In the first test case,
>>> [[]] is parsed as a tiddler title with the empty string "" as it's value.
>>> Weird, but it's still added to the input title list of the filter. But in
>>> the enlist filter, it does string parsing to determine all the titles in
>>> the parameter, and it determines there aren't any in the param, so it
>>> doesn't add anything to the list of input tiddlers titles.
>>>
>>> On Friday, April 5, 2019 at 8:46:40 AM UTC-4, Mohammad wrote:
>>>>
>>>> Hi S.S.,
>>>> Thank you for sharing!
>>>> I don't understand the result of test 3 in two cases! Why they are
>>>> different?
>>>>
>>>> --Mohammad
>>>>
>>>>
>>>>
>>>> On Friday, April 5, 2019 at 3:48:16 PM UTC+4:30, S. S. wrote:
>>>>>
>>>>>
>>>>> When trying to test for an *either/or* parameter, I used a filter,
>>>>> and found this interesting behaviour:
>>>>>
>>>>> \define test1(a b)
>>>>> <$list filter="[[$a$]] [[$b$]] +[limit[1]]" emptyMessage="c"></$list>
>>>>> \end
>>>>> \define test2(a b)
>>>>> <$list filter="[enlist[$a$]] [enlist[$b$]] +[limit[1]]" emptyMessage=
>>>>> "c"></$list>
>>>>> \end
>>>>>
>>>>> !! Test 1
>>>>> 1. <<test1 a:A b:B>> <br>
>>>>> 2. <<test1 a:A b:"">> <br>
>>>>> 3. <<test1 a:"" b:B>> <br>
>>>>> 4. <<test1 a:"" b:"">> <br>
>>>>>
>>>>> !!Test 2
>>>>> 1. <<test2 a:A b:B>> <br>
>>>>> 2. <<test2 a:A b:"">> <br>
>>>>> 3. <<test2 a:"" b:B>> <br>
>>>>> 4. <<test2 a:"" b:"">> <br>
>>>>>
>>>>>
>>>>> Test 1
>>>>>
>>>>> 1. A
>>>>> 2. A
>>>>> 3.
>>>>> 4.
>>>>>
>>>>> Test 2
>>>>>
>>>>> 1. A
>>>>> 2. A
>>>>> 3. B
>>>>> 4. c
>>>>>
>>>>> Perhaps useful too keep in mind!
>>>>>
>>>>> Cheers
>>>>>
>>>>>
>>>>>
>>>>>
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