Dynamic scripted nested array keys?

[Keith Clarke]

Thanks Brian this conversion to pPath to an array of keys hit the nail on the head.

So, for anyone else looking to show the (full non-truncated) content of a node in a read-only Tree widget in a tooltip, by clicking the actionInspect icon, is…
on actionInspect pPath

put the arrayData of widget "Tree" into aContent -- get the Tree's data

split pPath by comma -- convert pPath from list to an array of keys

set the tooltip of widget "Tree" to aContent[pPath] -- the current Tree node's content

end actionInspect


Thanks too Jaque, Paul, Bob & Henry for playing! :-) 
Best,
Keith  

> On 24 Apr 2021, at 14:31, Brian Milby via use-livecode <use-livecode at lists.runrev.com> wrote:
> 
> I guess I should reply to myself and say why this works.  At some point the
> feature was added that you could use an array as an index into an array.
> The format is a one based ordered array of keys.  So tPath[1] is the first
> level key, tPath[2] is the second level, etc.  If you wanted to get
> tTree["one"]["two"] then tPath[1]="one" and tPath[2]="two" so you could
> just get tTree[tPath].  Since comma is the default path delimiter (which
> can be changed), you can use split to turn a path list into a path array.
> 
> On Sat, Apr 24, 2021 at 9:26 AM Brian Milby <brian at milby7.com> wrote:
> 
>> Easiest way is to use split...
>> 
>> Given a tree widget this will take a path from field 1 and put the value
>> at that path in field 2
>> 
>> on mouseUp pMouseButton
>>   local tTree, tLoc
>>   put the arrayData of widget 1 into tTree
>>   put field 1 into tLoc
>>   split tLoc by comma
>>   put tTree[tLoc] into field 2
>> end mouseUp
>> 
>> Thanks,
>> Brian
>> 
>> On Sat, Apr 24, 2021 at 9:06 AM Paul Dupuis via use-livecode <
>> use-livecode at lists.runrev.com> wrote:
>> 
>>> I have only partially been following this thread, but if you need to
>>> find the array 'content' in an arbitrary nested array from a comma
>>> delimited path of array keys, recursion is the way to do it:
>>> 
>>> function fetchArrayContentFromPath pArray,pPath
>>>   -- pArray is an array
>>>   -- pPath is a comma delimited 'path' of array keys to the desired
>>> content
>>>   local tKey
>>>   if pArray is not an array then
>>>     return pArray -- I have reached the content, so return that content
>>>   else if pPath is empty then
>>>     return pArray -- should not happen in a tree widget, but this is if
>>> the path ends in an array instead of the content of an array element
>>>   else
>>>     put item 1 of pPath into tKey -- get the key of element in the
>>> currnet path
>>>     delete item 1 of pPath        -- remove it from the current path,
>>> so the path is the next set of key(s)
>>>     return fetchArrayContentFromPath(pArray[tKey],pPath) - recursively
>>> fetch the remainig keys from the currnet array element
>>>   end if
>>> end fetchArrayContentFromPath
>>> 
>>> It will not matter is the 'path' is key1,key1 or
>>> key1,key2,key3,key4,key5,key6,key7, or whatever.
>>> 
>>> 
>>> On 4/24/2021 7:10 AM, Keith Clarke via use-livecode wrote:
>>>> Hi folks,
>>>> Inspired by Jaque’s (working - thank you!) response to my question
>>> “Show Tree widget row contents on hover” I’ve isolated the final piece of
>>> that puzzle that leaves me baffled.
>>>> 
>>>> Specifically, can LiveCode accept a dynamically built key for a nested
>>> multi-dimensional array? Copy the button script recipe below to see the
>>> problem.
>>>> 
>>>> Perhaps the LC array experts here can help explain why Jaque’s
>>> hard-wired key definition works but my attempts to replicate this syntax
>>> via scripting to support variable depth of arrays  get ignored? Is it my
>>> syntax or just the way arrays work in LC…?
>>>> on mouseUp pButtonNumber
>>>> 
>>>> # Create a nested array
>>>> 
>>>> put "Content" into tArray["key1"]["key2"]["key3"]["key4"]
>>>> 
>>>> 
>>>> # Replicate the path response from the Tree widget actionInspect
>>> function
>>>> 
>>>> put "key1,key2,key3,key4" into pPath
>>>> 
>>>> 
>>>> # Jaque's 'hard-wired' array key recipe works!
>>>> 
>>>> answer tArray[item 1 of pPath][item 2 of pPath][item 3 of pPath][item 4
>>> of pPath] --returns 'Content'
>>>> 
>>>> 
>>>> # Replicate Jaque's syntax dynamically
>>>> 
>>>> put the number of items in pPath into tKeyCount
>>>> 
>>>> put empty into iNum
>>>> 
>>>> repeat for each item i in pPath
>>>> 
>>>> add 1 to iNum
>>>> 
>>>> # Try building the full key string
>>>> 
>>>> put "[" & item iNum of pPath & "]"after tKey1
>>>> 
>>>> 
>>>> # Try building keys string to 'embed' into the regular array key syntax
>>>> 
>>>> put item iNum of pPath after tKey2
>>>> 
>>>> if iNum < tKeyCount then put "][" after tKey2
>>>> 
>>>> 
>>>> # Try building by each key
>>>> 
>>>> if i is not empty then put "[" & item iNum of pPath & "]" after tArray2
>>>> 
>>>> end repeat
>>>> 
>>>> 
>>>> # Dynamic tKey1 results
>>>> 
>>>> answer tKey1 -- returns '["key1"]["key2"]["key3"]["key4"]' ...seems
>>> 'correct'
>>>> 
>>>> answer tArray & tKey1 -- returns '["key1"]["key2"]["key3"]["key4"]'
>>> ...dynamic key definition is not appended to array(?)
>>>> 
>>>> 
>>>> # Dynamic tKey2 results
>>>> 
>>>> answer tKey2 -- returns '"key1"]["key2"]["key3"]["key4"'
>>>> 
>>>> answer tArray[tKey2] -- returns null ...dynamic key definition is not
>>> understood (as first level key)?
>>>> 
>>>> 
>>>> answer tArray2 -- returns '["key1"]["key2"]["key3"]["key4"]' ...dynamic
>>> key definition is not appended to array(?)
>>>> 
>>>> end mouseUp
>>>> 
>>>> 
>>>> Best,
>>>> Keith
>>>> 
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