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programming - How to improve the creation of tables of code and comments


While writing a response to a certain MSE question I made a function that tabulates code and comments. (See the definition below.)


Here is an example:


code = "

  FoldList[(* reduction function *)
    Plus,(* function to apply repeatedly *)
    0,(* initial value *)
    {1,2,3,3,100}(* arguments in repeated computations *)]";
GridOfCodeAndComments[
 code,
 "GridFunction" -> (Panel@Grid[#, Alignment -> Left] &)]

enter image description here


I have several problems with the implementation of GridOfCodeAndComments, the main one being that I have to give a string to the function instead of (commented) code.



For example, I would like to be able to write the tabulate code directly to GridOfCodeAndComments:


GridOfCodeAndComments[
 FoldList[(* reduction function *)
    Plus,(* function to apply repeatedly *)
    0,(* initial value *)
    {1, 2, 3, 3, 100}(* arguments in repeated computations *)],
 "GridFunction" -> (Panel@Grid[#, Alignment -> Left] &)]

How can this be done? Any suggestions would be appreciated.


Another, minor problem in GridOfCodeAndComments is that the pattern for matching comments, comPat, is somewhat weak. How can it be improved?



Definition


ClearAll[GridOfCodeAndComments]

Options[GridOfCodeAndComments] = {"GridFunction" -> (Grid[#, Alignment -> Left] &)};

GridOfCodeAndComments[code_String, opts : OptionsPattern[]] :=      
  Block[{grData, codeLines, commentLines, comPat, gridFunc},

   gridFunc = OptionValue["GridFunction"];
   If[TrueQ[gridFunc === Automatic], gridFunc = (Grid[#, Alignment -> Left] &)];


   (* Split the code into lines *)
   codeLines = StringSplit[code, "\n"];

   (* Split each line into a {code, comment} pair *)
   comPat = ("(*" ~~ (Except["*"] ..) ~~ "*)");
   grData =
    Map[
     If[StringFreeQ[#, "(*"], {#, ""},
       StringCases[#, (x__ ~~ y : (comPat) ~~ z___) :> {x <> z, y}][[1]]

     ] &, codeLines];

   (* Style the code and comments *)
   grData[[All, 1]] = Map[Style[#, "Input"] &, grData[[All, 1]]];
   grData[[All, 2]] = 
    Map[Style[#, "CommentStyle" /. Options[$FrontEnd, AutoStyleOptions][[1, 2]]] &, grData[[All, 2]]];

   (* Show result *)
   gridFunc[grData]


  ];


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