[270] | 1 | ##
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| 2 | # Hash
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| 3 | #
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| 4 | # ISO 15.2.13
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| 5 | class Hash
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| 6 | ##
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| 7 | # Equality---Two hashes are equal if they each contain the same number
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| 8 | # of keys and if each key-value pair is equal to (according to
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| 9 | # <code>Object#==</code>) the corresponding elements in the other
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| 10 | # hash.
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| 11 | #
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| 12 | # ISO 15.2.13.4.1
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| 13 | def ==(hash)
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| 14 | return true if self.equal?(hash)
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[439] | 15 | unless Hash === hash
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[270] | 16 | return false
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| 17 | end
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| 18 | return false if self.size != hash.size
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| 19 | self.each do |k,v|
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| 20 | return false unless hash.key?(k)
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| 21 | return false unless self[k] == hash[k]
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| 22 | end
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| 23 | return true
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| 24 | end
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| 25 |
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| 26 | ##
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| 27 | # Returns <code>true</code> if <i>hash</i> and <i>other</i> are
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| 28 | # both hashes with the same content compared by eql?.
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| 29 | #
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| 30 | # ISO 15.2.13.4.32 (x)
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| 31 | def eql?(hash)
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| 32 | return true if self.equal?(hash)
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[439] | 33 | unless Hash === hash
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[270] | 34 | return false
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| 35 | end
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| 36 | return false if self.size != hash.size
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| 37 | self.each do |k,v|
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| 38 | return false unless hash.key?(k)
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| 39 | return false unless self[k].eql?(hash[k])
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| 40 | end
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| 41 | return true
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| 42 | end
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| 43 |
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| 44 | ##
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| 45 | # Delete the element with the key +key+.
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| 46 | # Return the value of the element if +key+
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| 47 | # was found. Return nil if nothing was
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| 48 | # found. If a block is given, call the
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| 49 | # block with the value of the element.
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| 50 | #
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| 51 | # ISO 15.2.13.4.8
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| 52 | def delete(key, &block)
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| 53 | if block && !self.has_key?(key)
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[439] | 54 | return block.call(key)
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[270] | 55 | end
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[439] | 56 | self.__delete(key)
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[270] | 57 | end
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| 58 |
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| 59 | ##
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| 60 | # Calls the given block for each element of +self+
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| 61 | # and pass the key and value of each element.
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| 62 | #
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| 63 | # call-seq:
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| 64 | # hsh.each {| key, value | block } -> hsh
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| 65 | # hsh.each_pair {| key, value | block } -> hsh
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| 66 | # hsh.each -> an_enumerator
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| 67 | # hsh.each_pair -> an_enumerator
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| 68 | #
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| 69 | #
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| 70 | # If no block is given, an enumerator is returned instead.
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| 71 | #
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| 72 | # h = { "a" => 100, "b" => 200 }
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| 73 | # h.each {|key, value| puts "#{key} is #{value}" }
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| 74 | #
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| 75 | # <em>produces:</em>
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| 76 | #
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| 77 | # a is 100
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| 78 | # b is 200
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| 79 | #
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| 80 | # ISO 15.2.13.4.9
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| 81 | def each(&block)
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[439] | 82 | return to_enum :each unless block
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[270] | 83 |
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| 84 | keys = self.keys
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| 85 | vals = self.values
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| 86 | len = self.size
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| 87 | i = 0
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| 88 | while i < len
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| 89 | block.call [keys[i], vals[i]]
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| 90 | i += 1
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| 91 | end
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| 92 | self
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| 93 | end
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| 94 |
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| 95 | ##
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| 96 | # Calls the given block for each element of +self+
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| 97 | # and pass the key of each element.
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| 98 | #
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| 99 | # call-seq:
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| 100 | # hsh.each_key {| key | block } -> hsh
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| 101 | # hsh.each_key -> an_enumerator
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| 102 | #
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| 103 | # If no block is given, an enumerator is returned instead.
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| 104 | #
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| 105 | # h = { "a" => 100, "b" => 200 }
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| 106 | # h.each_key {|key| puts key }
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| 107 | #
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| 108 | # <em>produces:</em>
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| 109 | #
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| 110 | # a
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| 111 | # b
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| 112 | #
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| 113 | # ISO 15.2.13.4.10
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| 114 | def each_key(&block)
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[439] | 115 | return to_enum :each_key unless block
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[270] | 116 |
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| 117 | self.keys.each{|k| block.call(k)}
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| 118 | self
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| 119 | end
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| 120 |
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| 121 | ##
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| 122 | # Calls the given block for each element of +self+
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| 123 | # and pass the value of each element.
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| 124 | #
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| 125 | # call-seq:
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| 126 | # hsh.each_value {| value | block } -> hsh
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| 127 | # hsh.each_value -> an_enumerator
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| 128 | #
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| 129 | # If no block is given, an enumerator is returned instead.
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| 130 | #
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| 131 | # h = { "a" => 100, "b" => 200 }
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| 132 | # h.each_value {|value| puts value }
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| 133 | #
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| 134 | # <em>produces:</em>
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| 135 | #
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| 136 | # 100
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| 137 | # 200
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| 138 | #
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| 139 | # ISO 15.2.13.4.11
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| 140 | def each_value(&block)
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[439] | 141 | return to_enum :each_value unless block
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[270] | 142 |
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| 143 | self.keys.each{|k| block.call(self[k])}
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| 144 | self
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| 145 | end
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| 146 |
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| 147 | ##
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| 148 | # Replaces the contents of <i>hsh</i> with the contents of other hash
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| 149 | #
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| 150 | # ISO 15.2.13.4.23
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| 151 | def replace(hash)
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[439] | 152 | raise TypeError, "Hash required (#{hash.class} given)" unless Hash === hash
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[270] | 153 | self.clear
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| 154 | hash.each_key{|k|
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| 155 | self[k] = hash[k]
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| 156 | }
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| 157 | if hash.default_proc
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| 158 | self.default_proc = hash.default_proc
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| 159 | else
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| 160 | self.default = hash.default
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| 161 | end
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| 162 | self
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| 163 | end
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| 164 | # ISO 15.2.13.4.17
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| 165 | alias initialize_copy replace
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| 166 |
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| 167 | ##
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| 168 | # Return a hash which contains the content of
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| 169 | # +self+ and +other+. If a block is given
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| 170 | # it will be called for each element with
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| 171 | # a duplicate key. The value of the block
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| 172 | # will be the final value of this element.
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| 173 | #
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| 174 | # ISO 15.2.13.4.22
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| 175 | def merge(other, &block)
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[439] | 176 | raise TypeError, "Hash required (#{other.class} given)" unless Hash === other
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| 177 | h = self.dup
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[270] | 178 | if block
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| 179 | other.each_key{|k|
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| 180 | h[k] = (self.has_key?(k))? block.call(k, self[k], other[k]): other[k]
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| 181 | }
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| 182 | else
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| 183 | other.each_key{|k| h[k] = other[k]}
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| 184 | end
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| 185 | h
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| 186 | end
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| 187 |
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| 188 | # internal method for Hash inspection
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[439] | 189 | def _inspect(recur_list)
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[270] | 190 | return "{}" if self.size == 0
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[439] | 191 | return "{...}" if recur_list[self.object_id]
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| 192 | recur_list[self.object_id] = true
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| 193 | ary=[]
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| 194 | keys=self.keys
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| 195 | size=keys.size
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| 196 | i=0
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| 197 | while i<size
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| 198 | k=keys[i]
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| 199 | ary<<(k._inspect(recur_list) + "=>" + self[k]._inspect(recur_list))
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| 200 | i+=1
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| 201 | end
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| 202 | "{"+ary.join(", ")+"}"
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[270] | 203 | end
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| 204 | ##
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[331] | 205 | # Return the contents of this hash as a string.
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[270] | 206 | #
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| 207 | # ISO 15.2.13.4.30 (x)
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| 208 | def inspect
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[439] | 209 | self._inspect({})
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[270] | 210 | end
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| 211 | # ISO 15.2.13.4.31 (x)
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| 212 | alias to_s inspect
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| 213 |
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| 214 | ##
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| 215 | # call-seq:
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| 216 | # hsh.reject! {| key, value | block } -> hsh or nil
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| 217 | # hsh.reject! -> an_enumerator
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| 218 | #
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| 219 | # Equivalent to <code>Hash#delete_if</code>, but returns
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| 220 | # <code>nil</code> if no changes were made.
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| 221 | #
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| 222 | # 1.8/1.9 Hash#reject! returns Hash; ISO says nothing.
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| 223 | #
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[439] | 224 | def reject!(&block)
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| 225 | return to_enum :reject! unless block
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[270] | 226 |
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| 227 | keys = []
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| 228 | self.each{|k,v|
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[439] | 229 | if block.call([k, v])
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[270] | 230 | keys.push(k)
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| 231 | end
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| 232 | }
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| 233 | return nil if keys.size == 0
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| 234 | keys.each{|k|
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| 235 | self.delete(k)
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| 236 | }
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| 237 | self
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| 238 | end
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| 239 |
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| 240 | ##
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| 241 | # call-seq:
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| 242 | # hsh.reject {|key, value| block} -> a_hash
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| 243 | # hsh.reject -> an_enumerator
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| 244 | #
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| 245 | # Returns a new hash consisting of entries for which the block returns false.
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| 246 | #
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| 247 | # If no block is given, an enumerator is returned instead.
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| 248 | #
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| 249 | # h = { "a" => 100, "b" => 200, "c" => 300 }
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| 250 | # h.reject {|k,v| k < "b"} #=> {"b" => 200, "c" => 300}
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| 251 | # h.reject {|k,v| v > 100} #=> {"a" => 100}
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| 252 | #
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| 253 | # 1.8/1.9 Hash#reject returns Hash; ISO says nothing.
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| 254 | #
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[439] | 255 | def reject(&block)
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| 256 | return to_enum :reject unless block
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[270] | 257 |
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| 258 | h = {}
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| 259 | self.each{|k,v|
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[439] | 260 | unless block.call([k, v])
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[270] | 261 | h[k] = v
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| 262 | end
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| 263 | }
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| 264 | h
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| 265 | end
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| 266 |
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| 267 | ##
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| 268 | # call-seq:
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| 269 | # hsh.select! {| key, value | block } -> hsh or nil
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| 270 | # hsh.select! -> an_enumerator
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| 271 | #
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| 272 | # Equivalent to <code>Hash#keep_if</code>, but returns
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| 273 | # <code>nil</code> if no changes were made.
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| 274 | #
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| 275 | # 1.9 Hash#select! returns Hash; ISO says nothing.
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| 276 | #
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[439] | 277 | def select!(&block)
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| 278 | return to_enum :select! unless block
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[270] | 279 |
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| 280 | keys = []
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| 281 | self.each{|k,v|
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[439] | 282 | unless block.call([k, v])
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[270] | 283 | keys.push(k)
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| 284 | end
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| 285 | }
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| 286 | return nil if keys.size == 0
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| 287 | keys.each{|k|
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| 288 | self.delete(k)
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| 289 | }
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| 290 | self
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| 291 | end
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| 292 |
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| 293 | ##
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| 294 | # call-seq:
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| 295 | # hsh.select {|key, value| block} -> a_hash
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| 296 | # hsh.select -> an_enumerator
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| 297 | #
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| 298 | # Returns a new hash consisting of entries for which the block returns true.
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| 299 | #
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| 300 | # If no block is given, an enumerator is returned instead.
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| 301 | #
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| 302 | # h = { "a" => 100, "b" => 200, "c" => 300 }
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| 303 | # h.select {|k,v| k > "a"} #=> {"b" => 200, "c" => 300}
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| 304 | # h.select {|k,v| v < 200} #=> {"a" => 100}
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| 305 | #
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| 306 | # 1.9 Hash#select returns Hash; ISO says nothing
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| 307 | #
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[439] | 308 | def select(&block)
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| 309 | return to_enum :select unless block
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[270] | 310 |
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| 311 | h = {}
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| 312 | self.each{|k,v|
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[439] | 313 | if block.call([k, v])
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[270] | 314 | h[k] = v
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| 315 | end
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| 316 | }
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| 317 | h
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| 318 | end
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| 319 | end
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| 320 |
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| 321 | ##
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| 322 | # Hash is enumerable
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| 323 | #
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| 324 | # ISO 15.2.13.3
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| 325 | class Hash
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| 326 | include Enumerable
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| 327 | end
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