Dynamic scripted nested array keys?

Paul Dupuis paul at researchware.com
Sat Apr 24 09:04:24 EDT 2021


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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