Last change
on this file since 439 was 439, checked in by coas-nagasima, 4 years ago |
mrubyを2.1.1に更新
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Property svn:eol-style
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native
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Property svn:mime-type
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text/x-ruby;charset=UTF-8
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File size:
977 bytes
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Rev | Line | |
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[439] | 1 | ##
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| 2 | # chain.rb Enumerator::Chain class
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| 3 | # See Copyright Notice in mruby.h
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| 4 |
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| 5 | module Enumerable
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| 6 | def chain(*args)
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| 7 | Enumerator::Chain.new(self, *args)
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| 8 | end
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| 9 | end
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| 10 |
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| 11 | class Enumerator
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| 12 | def +(other)
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| 13 | Chain.new(self, other)
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| 14 | end
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| 15 |
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| 16 | class Chain
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| 17 | include Enumerable
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| 18 |
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| 19 | def initialize(*args)
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| 20 | @enums = args.freeze
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| 21 | @pos = -1
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| 22 | end
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| 23 |
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| 24 | def each(&block)
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| 25 | return to_enum unless block
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| 26 |
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| 27 | i = 0
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| 28 | while i < @enums.size
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| 29 | @pos = i
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| 30 | @enums[i].each(&block)
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| 31 | i += 1
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| 32 | end
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| 33 |
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| 34 | self
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| 35 | end
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| 36 |
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| 37 | def size
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| 38 | @enums.reduce(0) do |a, e|
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| 39 | return nil unless e.respond_to?(:size)
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| 40 | a + e.size
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| 41 | end
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| 42 | end
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| 43 |
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| 44 | def rewind
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| 45 | while 0 <= @pos && @pos < @enums.size
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| 46 | e = @enums[@pos]
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| 47 | e.rewind if e.respond_to?(:rewind)
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| 48 | @pos -= 1
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| 49 | end
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| 50 |
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| 51 | self
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| 52 | end
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| 53 |
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| 54 | def +(other)
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| 55 | self.class.new(self, other)
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| 56 | end
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| 57 |
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| 58 | def inspect
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| 59 | "#<#{self.class}: #{@enums.inspect}>"
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| 60 | end
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| 61 | end
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| 62 | end
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