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I'm trying to customize a .bst file, and I'm in desperate need of some assistance.

I have a citation that looks like this:

After the title of the book, I'm trying to put parentheses around the edition, volume, number, and pages. I am able to do each individually [e.g., (Vol. 14), (pp. 207-262)] but not around everything in one set of parentheses [i.e., (Vol. 14, pp. 207-262)].

This reference is an "incollection".

Also, is there anyway to suppress the comma the occurs before?

So that it looks like this:
... Advances in research and theory (Vol. 14, pp. 207-262). New York: Academic Press.

FUNCTION {incollection}

{ output.bibitem

  format.authors "author" output.check

  format.date "year" output.check

  date.block

  format.title "title" output.check

  new.sentence

  crossref missing$

    { format.in.ed.booktitle "booktitle" output.check



      format.edition output

      format.bvolume output

      format.number.series output

      format.chapter.pages output



      new.sentence

      format.publisher.address output

    }

    { format.incoll.inproc.crossref output.nonnull

      format.chapter.pages output

    }

  if$

  format.note output

  fin.entry

}

And here's my .bst file in its entirety: https://pastebin.com/ZQNx0P9U (Was too long to post here.)

And here's the .bib entry:

@incollection{RaaiShif80,

        Address = {New York},

        Author = {Raaijmakers, J. G. W. and Shiffrin, R. M.},

        Booktitle = {The psychology of learning and motivation: Advances in research and theory},

        Date-Added = {2014-09-10 12:47:36 +0000},

        Date-Modified = {2014-09-10 12:47:54 +0000},

        Editor = {G. H. Bower},

        Pages = {207-262},

        Publisher = {Academic Press},

        Title = {{SAM: A} theory of probabilistic search of associative memory},

        Volume = {14},

        Year = {1980}}

And a sample .tex file:
documentclass{article}
usepackage[english]{babel}

begin{document}



section*{Sample Citation}



This is a sample citation: cite{RaaiShif80}.



bibliographystyle{mybst.bst}

bibliography{sample}



end{document}

Thanks for your help!

I have the same problem so first I create this function

FUNCTION {parens}

{ duplicate$ empty$
{ pop$ "" }
{ "(" swap$ * ")" * }
if$
}