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Ruby Programming
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xmp

irb's xmp is an ``example printer''---that is, a pretty-printer that shows the value of each expression as it is run (much like the script we wrote to format the examples in this book). There is also another stand-alone xmp in the archives.

xmp can be used as follows:

require "irb/xmp"

xmp <<END artist = "Doc Severinsen" artist END
produces:
[pwd:/tc/work/ruby/ProgrammingRuby/latex]
artist = "Doc Severinsen"
    ==>"Doc Severinsen"
artist
    ==>"Doc Severinsen"

Or, it can be used as an object instance. Used in this fashion, the object maintains context between invocations:

require "irb/xmp"

x = XMP.new x.puts <<END artist = "Louis Prima" END

x.puts <<END artist END
produces:
[pwd:/tc/work/ruby/ProgrammingRuby/latex]
artist = "Louis Prima"
    ==>"Louis Prima"
artist
    ==>"Louis Prima"

You can explicitly provide a binding with either form; otherwise, xmp uses the caller's environment.

xmp code_string, abinding
XMP.new(abinding)

Note that xmp does not work with multithreading.
Ruby Programming
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