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Fix ActiveSupport::Multibyte::Chars#slice for empty strings when starting offset is negative [#4717 state:resolved]

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Signed-off-by: José Valim <jose.valim@gmail.com>
This commit is contained in:
Alex Muntean 2010-05-28 13:22:29 +09:00 committed by José Valim
parent 4dbb6e3ff0
commit 265b7c5edf
2 changed files with 3 additions and 1 deletions
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3
activesupport/lib/active_support/multibyte/chars.rb
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@ -318,7 +318,8 @@ module ActiveSupport #:nodoc:
character = Unicode.u_unpack(@wrapped_string)[args[0]]
result = character.nil? ? nil : [character].pack('U')
else
result = Unicode.u_unpack(@wrapped_string).slice(*args).pack('U*')
cps = Unicode.u_unpack(@wrapped_string).slice(*args)
result = cps.nil? ? nil : cps.pack('U*')
end
result.nil? ? nil : chars(result)
end

1
activesupport/test/multibyte_chars_test.rb
View file

@ -397,6 +397,7 @@ class MultibyteCharsUTF8BehaviourTest < Test::Unit::TestCase
assert_equal 'こ', @chars.slice(0)
assert_equal 'わ', @chars.slice(3)
assert_equal nil, ''.mb_chars.slice(-1..1)
assert_equal nil, ''.mb_chars.slice(-1, 1)
assert_equal '', ''.mb_chars.slice(0..10)
assert_equal 'にちわ', @chars.slice(1..3)
assert_equal 'にちわ', @chars.slice(1, 3)