Search Values of Array in "One Go"

Brian Milby brian at milby7.com
Sat Aug 26 18:20:38 EDT 2017


You could set your needle to be a valid LCS expression.  I just ran a test
using the following:

*do* "if (" & pNeedle & ") then put tPath into xFoundPaths[the number of
elements in xFoundPaths + 1]"

It took around 4x of the time to run though.  I set my needle to "tElement
> 5000" for one test and "tElement > 5000 and tElement < 5002" for
another.  Times were similar for each.

With a roughly 10% cost per nested if inside the recursion loop, it would
seem that specific helper functions would be needed for each type of
search.  I'm not sure if a switch would optimize it any.  The wrapper
function could be generalized and perform the if/switch once to select the
appropriate private handler.

Using matchtext for a simple "or" type doesn't seem to cost much more than
using a nested if would.  I tried a search using a needle of
"(Chocolate|Maple)".

I'm using example 5 from this site for my JSON:
https://adobe.github.io/Spry/samples/data_region/JSONDataSetSample.html

I can post a copy of the test stack I'm playing around with if anyone would
be interested.

On Sat, Aug 26, 2017 at 9:04 AM, Alex Tweedly via use-livecode <
use-livecode at lists.runrev.com> wrote:

> I think regex (or multiple string comparisons) is too limited a way to go.
>
> I would want to be able to do numeric comparisons, range comparisons, etc.
>
> e.g. x is a number, x<25, 24 < x < 33, etc.
>
> -- Alex.
>
> On 26/08/2017 05:05, Brian Milby via use-livecode wrote:
>
>> tElement isn't the part that would change (you are still searching against
>> a single value in the array), you would need to modify the comparison to
>> allow for pNeedle to contain multiple values and the operators.  It would
>> probably be easier to modify to use a RegEx.  If you have 2 comma
>> separated
>> items, you could use something like the following (I'm sure the more
>> experienced can offer much better ways though):
>>
>> *if* (tElement contains item 1 of pNeedle) or (tElement contains item 2 of
>> pNeedle) *then*
>>
>>
>> On Fri, Aug 25, 2017 at 10:41 PM, Sannyasin Brahmanathaswami via
>> use-livecode <use-livecode at lists.runrev.com> wrote:
>>
>> OK I will bite
>>>
>>> what would an array representing an "AND/OR"
>>> style query look like such that if used as a predicate
>>>
>>> for
>>>
>>>       else if tElement contains pNeedle then
>>>
>>> it would return true/false
>>>
>>> How would you have to construct "tElement"
>>>
>>> ??
>>>
>>>
>>>
>>> Mark: In terms of generalizing that function - then the key line which
>>> checks
>>> whether an element matches is:
>>>
>>>       else if tElement contains pNeedle then
>>>
>>>
>>>      One could imagine that this could be an arbitrary predicate -
>>> pNeedle
>>>      doesn't have to be a string, so could be an array representing a
>>> AND /
>>>      OR style query; or could be a regex (in which case you'd use
>>> matchText).
>>>
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