Fix ActiveSupport::Multibyte::Chars#slice for empty strings when starting offset is negative [#4717 state:resolved]
Signed-off-by: José Valim <jose.valim@gmail.com>
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@ -318,7 +318,8 @@ def slice(*args)
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character = Unicode.u_unpack(@wrapped_string)[args[0]]
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result = character.nil? ? nil : [character].pack('U')
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else
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result = Unicode.u_unpack(@wrapped_string).slice(*args).pack('U*')
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cps = Unicode.u_unpack(@wrapped_string).slice(*args)
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result = cps.nil? ? nil : cps.pack('U*')
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end
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result.nil? ? nil : chars(result)
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end
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@ -397,6 +397,7 @@ def test_slice_should_take_character_offsets
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assert_equal 'こ', @chars.slice(0)
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assert_equal 'わ', @chars.slice(3)
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assert_equal nil, ''.mb_chars.slice(-1..1)
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assert_equal nil, ''.mb_chars.slice(-1, 1)
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assert_equal '', ''.mb_chars.slice(0..10)
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assert_equal 'にちわ', @chars.slice(1..3)
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assert_equal 'にちわ', @chars.slice(1, 3)
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