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class Symbol
# Easily manipulate undercores on symbols.
#
# :a.pad(2) #=> :__a__
# :__a__.pad(-1) #=> :_a_
#
# CREDIT: Trans
def shadow(i=1)
return self if i == 0
s = self.to_s
if i > 0
return ( ('_'*i) + self.to_s + ('_'*i) ).to_sym
else
i *= -1
return s[i..-i-1].to_sym if s[0..i-1] == ('_'*i) and s[-i..-1] == ('_'*i)
return self
end
end
alias :pad :shadow
end
__END__
require 'test/unit'
class TestSymbolShadow < Test::Unit::TestCase
def test_shadow
assert_equal( :__a__, :a.shadow(2) )
assert_equal( :_a_, :__a__.shadow(-1) )
end
end
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