From: Philip Mak <pmak@...>
Date: 2002-07-10T09:10:45+09:00
Subject: Accessing caller's binding?

I'm trying to make a function that is called like this:

    cgi.export(%w(name email phone))

which would have the same effect as this:

    name = cgi['name'][0]
    email = cgi['email'][0]
    phone = cgi['phone'][0]

Since there doesn't seem to be a way to get the binding of the caller
automatically, I had to try stuff like:

    cgi.export(%w(name email phone), binding())
    # cgi.export uses the binding to eval

and

    eval cgi.export(%w(name email phone))
    # cgi.export returns code to set the variables

But I can't get it to work. Apparently, it doesn't seem to be possible
to create a variable in this fashion. Observe the following piece of
code, which looks like it should work but doesn't:

$ ruby -e"eval 'x = 3'; puts x"
-e:1: undefined local variable or method `x' for #<Object:0x401ddce0> (NameError)

Does anyone have ideas on how I could create such a function, or am I
trying to do the impossible? I want to minimize the amount of code
that has to be typed by the caller.