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Contents
# TITLE:
#
# Binding Variables
#
# SUMMARY:
#
# Access binding variables. This requires the #eval.
require 'facets/binding/eval.rb'
#
class Binding
def self.included(base) #:nodoc:
base.send(:include, Eval)
end
# Returns the local variables defined in the binding context
#
# a = 2
# binding.local_variables #=> ["a"]
#
def local_variables()
eval("local_variables")
end
# Returns the value of some variable.
#
# a = 2
# binding["a"] #=> 2
#
def []( x )
eval( x.to_s )
end
# Set the value of a local variable.
#
# binding["a"] = 4
# a #=> 4
#
def []=( l, v )
eval( "lambda {|v| #{l} = v}").call( v )
end
end
# _____ _
# |_ _|__ ___| |_
# | |/ _ \/ __| __|
# | | __/\__ \ |_
# |_|\___||___/\__|
#
=begin test
require 'test/unit'
class TestBindingVariables < Test::Unit::TestCase
def setup
a = 1
b = 2
x = "hello"
# the line number must be updated if it moves
@bind = binding; @this_line_no = __LINE__
@this_file_name = File.basename( __FILE__ ) # why does it equal basename only?
end
def test_local_variables
assert_equal( ["a","b","x"], @bind.local_variables )
end
def test_op_store
assert_nothing_raised{ @bind["x"] = "goodbye" }
assert_equal( "goodbye", @bind["x"] )
end
def test_op_fetch
assert_equal( "hello", @bind["x"] )
end
end
=end
Version data entries
10 entries across 10 versions & 1 rubygems