class XMP
An example printer for irb.
It’s much like the standard library PrettyPrint
, that shows the value of each expression as it runs.
In order to use this library, you must first require it:
require 'irb/xmp'
Now, you can take advantage of the Object#xmp
convenience method.
xmp <<END foo = "bar" baz = 42 END #=> foo = "bar" #==>"bar" #=> baz = 42 #==>42
You can also create an XMP
object, with an optional binding to print expressions in the given binding:
ctx = binding x = XMP.new ctx x.puts #=> today = "a good day" #==>"a good day" ctx.eval 'today # is what?' #=> "a good day"
Public Class Methods
Source
# File lib/irb/xmp.rb, line 49 def initialize(bind = nil) IRB.init_config(nil) IRB.conf[:PROMPT_MODE] = :XMP bind = IRB::Frame.top(1) unless bind ws = IRB::WorkSpace.new(bind) @io = StringInputMethod.new @irb = IRB::Irb.new(ws, @io) @irb.context.ignore_sigint = false IRB.conf[:MAIN_CONTEXT] = @irb.context end
Creates a new XMP
object.
The top-level binding or, optional bind
parameter will be used when creating the workspace. See WorkSpace.new for more information.
This uses the :XMP
prompt mode. See Custom Prompts for more information.
Public Instance Methods
Source
# File lib/irb/xmp.rb, line 74 def puts(exps) @io.puts exps if @irb.context.ignore_sigint begin trap_proc_b = trap("SIGINT"){@irb.signal_handle} catch(:IRB_EXIT) do @irb.eval_input end ensure trap("SIGINT", trap_proc_b) end else catch(:IRB_EXIT) do @irb.eval_input end end end
Evaluates the given exps
, for example:
require 'irb/xmp' x = XMP.new x.puts '{:a => 1, :b => 2, :c => 3}' #=> {:a => 1, :b => 2, :c => 3} # ==>{:a=>1, :b=>2, :c=>3} x.puts 'foo = "bar"' # => foo = "bar" # ==>"bar"