How to reuse the output of an environment

Question

I have created an environment with NewEnviron that processes some input. For the sake of the discussion, it is something like
NewEnviron{myworkingenvironment}[1]
{   
    BODY % BODY is expected to define A, B and C
    
    numericResult{A + B + C}
    textResult{A + B + C}
}

The functions typeset the output I want them to and I use the environment extensively (the parameter #1, thus far unused, should serve as an ID).
Now I want to use the variables of this environment in another one, like:
NewEnviron{mynewenvironment}[1]
{

BODY 
     
    The input was get{#1:A}, get{#1:B} and get{#1:C}
    The result was get{id:numericResult}.
}

How can I implement this get macro? The options I've found so far (e.g. change @currentlabelname and defining a label afterwards) do not seem to work (I always get the name of the section where the reference is, instead of the value I expected).

Ian Thompson · Answer

I think this does what you require.
documentclass{article}
usepackage{environ}
NewEnviron{myworkingenvironment}[1]{BODY%
globalexpandafterletcsname#1AendcsnameA
globalexpandafterletcsname#1BendcsnameB}

NewEnviron{mynewenvironment}[1]{BODY%
defgetrelay##1:##2{csname##1##2endcsname}
defget##1{getrelay##1}
get{#1:A} is a friendly clown.
get{ABC:B} is a dangerous doll.
}

begin{document}
%
begin{myworkingenvironment}{ABC}
newcommandA{Pennywise}
newcommandB{Chucky}
end{myworkingenvironment}

begin{mynewenvironment}{ABC}
end{mynewenvironment}

end{document}

The idea is that when you create a myworkingenvironment called ABC, global macros called ABCA and ABCB are generated automatically. The get command implemented here just allows you to say something like get{#1:A} (where #1 is ABC) rather than typing ABCA directly. Let me know if this works for you, and I will add a more detailed explanation.

How to reuse the output of an environment

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