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################################
# Author: Benjamin Kellermann #
# Licence: CC-by-sa 3.0 #
# see Licence #
################################
class Hash
def compare_by_values(other, fieldarray)
return 0 if fieldarray.size == 0
return 1 if self[fieldarray[0]].nil?
return -1 if other[fieldarray[0]].nil?
if self[fieldarray[0]] == other[fieldarray[0]]
if fieldarray.size == 1
return 0
else
return self.compare_by_values(other, fieldarray[1,fieldarray.size-1])
end
else
self[fieldarray[0]] <=> other[fieldarray[0]]
end
end
end
if __FILE__ == $0
require "test/unit"
class Hash_test < Test::Unit::TestCase
def test_compare_by_values
a = {1 =>1, 2=>2, 3=>3}
b = {1 =>1, 2=>2, 3=>2}
c = {1 =>1, 2=>3, 3=>3}
d = {1 =>1, 2=>3}
assert_equal( 0,a.compare_by_values(a,[1,2,3]))
assert_equal( 1,a.compare_by_values(b,[1,2,3]))
assert_equal(-1,a.compare_by_values(c,[1,2,3]))
assert_equal( 1,c.compare_by_values(d,[1,2,3]))
assert_equal(-1,d.compare_by_values(c,[1,2,3]))
assert_equal( 0,d.compare_by_values(c,[]))
end
end
end
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