[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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| 15 | begin
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| 16 | hash = hash.to_hash
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| 17 | rescue NoMethodError
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| 18 | return false
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| 19 | end
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| 20 | return false if self.size != hash.size
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| 21 | self.each do |k,v|
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| 22 | return false unless hash.key?(k)
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| 23 | return false unless self[k] == hash[k]
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| 24 | end
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| 25 | return true
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| 26 | end
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| 27 |
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| 28 | ##
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| 29 | # Returns <code>true</code> if <i>hash</i> and <i>other</i> are
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| 30 | # both hashes with the same content compared by eql?.
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| 31 | #
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| 32 | # ISO 15.2.13.4.32 (x)
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| 33 | def eql?(hash)
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| 34 | return true if self.equal?(hash)
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| 35 | begin
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| 36 | hash = hash.to_hash
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| 37 | rescue NoMethodError
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| 38 | return false
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| 39 | end
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| 40 | return false if self.size != hash.size
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| 41 | self.each do |k,v|
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| 42 | return false unless hash.key?(k)
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| 43 | return false unless self[k].eql?(hash[k])
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| 44 | end
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| 45 | return true
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| 46 | end
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| 47 |
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| 48 | ##
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| 49 | # Delete the element with the key +key+.
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| 50 | # Return the value of the element if +key+
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| 51 | # was found. Return nil if nothing was
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| 52 | # found. If a block is given, call the
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| 53 | # block with the value of the element.
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| 54 | #
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| 55 | # ISO 15.2.13.4.8
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| 56 | def delete(key, &block)
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| 57 | if block && !self.has_key?(key)
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| 58 | block.call(key)
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| 59 | else
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| 60 | self.__delete(key)
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| 61 | end
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| 62 | end
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| 63 |
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| 64 | ##
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| 65 | # Calls the given block for each element of +self+
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| 66 | # and pass the key and value of each element.
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| 67 | #
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| 68 | # call-seq:
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| 69 | # hsh.each {| key, value | block } -> hsh
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| 70 | # hsh.each_pair {| key, value | block } -> hsh
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| 71 | # hsh.each -> an_enumerator
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| 72 | # hsh.each_pair -> an_enumerator
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| 73 | #
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| 74 | #
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| 75 | # If no block is given, an enumerator is returned instead.
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| 76 | #
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| 77 | # h = { "a" => 100, "b" => 200 }
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| 78 | # h.each {|key, value| puts "#{key} is #{value}" }
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| 79 | #
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| 80 | # <em>produces:</em>
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| 81 | #
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| 82 | # a is 100
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| 83 | # b is 200
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| 84 | #
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| 85 | # ISO 15.2.13.4.9
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| 86 | def each(&block)
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| 87 | return to_enum :each unless block_given?
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| 88 |
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| 89 | keys = self.keys
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| 90 | vals = self.values
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| 91 | len = self.size
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| 92 | i = 0
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| 93 | while i < len
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| 94 | block.call [keys[i], vals[i]]
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| 95 | i += 1
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| 96 | end
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| 97 | self
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| 98 | end
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| 99 |
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| 100 | ##
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| 101 | # Calls the given block for each element of +self+
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| 102 | # and pass the key of each element.
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| 103 | #
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| 104 | # call-seq:
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| 105 | # hsh.each_key {| key | block } -> hsh
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| 106 | # hsh.each_key -> an_enumerator
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| 107 | #
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| 108 | # If no block is given, an enumerator is returned instead.
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| 109 | #
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| 110 | # h = { "a" => 100, "b" => 200 }
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| 111 | # h.each_key {|key| puts key }
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| 112 | #
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| 113 | # <em>produces:</em>
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| 114 | #
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| 115 | # a
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| 116 | # b
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| 117 | #
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| 118 | # ISO 15.2.13.4.10
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| 119 | def each_key(&block)
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| 120 | return to_enum :each_key unless block_given?
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| 121 |
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| 122 | self.keys.each{|k| block.call(k)}
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| 123 | self
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| 124 | end
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| 125 |
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| 126 | ##
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| 127 | # Calls the given block for each element of +self+
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| 128 | # and pass the value of each element.
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| 129 | #
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| 130 | # call-seq:
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| 131 | # hsh.each_value {| value | block } -> hsh
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| 132 | # hsh.each_value -> an_enumerator
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| 133 | #
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| 134 | # If no block is given, an enumerator is returned instead.
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| 135 | #
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| 136 | # h = { "a" => 100, "b" => 200 }
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| 137 | # h.each_value {|value| puts value }
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| 138 | #
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| 139 | # <em>produces:</em>
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| 140 | #
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| 141 | # 100
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| 142 | # 200
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| 143 | #
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| 144 | # ISO 15.2.13.4.11
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| 145 | def each_value(&block)
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| 146 | return to_enum :each_value unless block_given?
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| 147 |
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| 148 | self.keys.each{|k| block.call(self[k])}
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| 149 | self
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| 150 | end
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| 151 |
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| 152 | ##
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| 153 | # Replaces the contents of <i>hsh</i> with the contents of other hash
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| 154 | #
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| 155 | # ISO 15.2.13.4.23
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| 156 | def replace(hash)
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| 157 | self.clear
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| 158 | hash = hash.to_hash
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| 159 | hash.each_key{|k|
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| 160 | self[k] = hash[k]
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| 161 | }
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| 162 | if hash.default_proc
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| 163 | self.default_proc = hash.default_proc
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| 164 | else
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| 165 | self.default = hash.default
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| 166 | end
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| 167 | self
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| 168 | end
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| 169 | # ISO 15.2.13.4.17
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| 170 | alias initialize_copy replace
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| 171 |
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| 172 | ##
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| 173 | # Return a hash which contains the content of
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| 174 | # +self+ and +other+. If a block is given
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| 175 | # it will be called for each element with
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| 176 | # a duplicate key. The value of the block
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| 177 | # will be the final value of this element.
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| 178 | #
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| 179 | # ISO 15.2.13.4.22
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| 180 | def merge(other, &block)
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| 181 | h = {}
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| 182 | raise TypeError, "can't convert argument into Hash" unless other.respond_to?(:to_hash)
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| 183 | other = other.to_hash
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| 184 | self.each_key{|k| h[k] = self[k]}
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| 185 | if block
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| 186 | other.each_key{|k|
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| 187 | h[k] = (self.has_key?(k))? block.call(k, self[k], other[k]): other[k]
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| 188 | }
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| 189 | else
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| 190 | other.each_key{|k| h[k] = other[k]}
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| 191 | end
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| 192 | h
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| 193 | end
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| 194 |
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| 195 | # internal method for Hash inspection
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| 196 | def _inspect
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| 197 | return "{}" if self.size == 0
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| 198 | "{"+self.map {|k,v|
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| 199 | k._inspect + "=>" + v._inspect
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| 200 | }.join(", ")+"}"
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| 201 | end
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| 202 | ##
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| 203 | # Return the contents of this hash as a string.
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| 204 | #
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| 205 | # ISO 15.2.13.4.30 (x)
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| 206 | def inspect
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| 207 | begin
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| 208 | self._inspect
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| 209 | rescue SystemStackError
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| 210 | "{...}"
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| 211 | end
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| 212 | end
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| 213 | # ISO 15.2.13.4.31 (x)
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| 214 | alias to_s inspect
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| 215 |
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| 216 | ##
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| 217 | # call-seq:
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| 218 | # hsh.reject! {| key, value | block } -> hsh or nil
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| 219 | # hsh.reject! -> an_enumerator
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| 220 | #
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| 221 | # Equivalent to <code>Hash#delete_if</code>, but returns
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| 222 | # <code>nil</code> if no changes were made.
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| 223 | #
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| 224 | # 1.8/1.9 Hash#reject! returns Hash; ISO says nothing.
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| 225 | #
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| 226 | def reject!(&b)
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| 227 | return to_enum :reject! unless block_given?
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| 228 |
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| 229 | keys = []
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| 230 | self.each{|k,v|
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| 231 | if b.call([k, v])
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| 232 | keys.push(k)
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| 233 | end
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| 234 | }
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| 235 | return nil if keys.size == 0
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| 236 | keys.each{|k|
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| 237 | self.delete(k)
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| 238 | }
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| 239 | self
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| 240 | end
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| 241 |
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| 242 | ##
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| 243 | # call-seq:
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| 244 | # hsh.reject {|key, value| block} -> a_hash
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| 245 | # hsh.reject -> an_enumerator
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| 246 | #
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| 247 | # Returns a new hash consisting of entries for which the block returns false.
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| 248 | #
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| 249 | # If no block is given, an enumerator is returned instead.
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| 250 | #
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| 251 | # h = { "a" => 100, "b" => 200, "c" => 300 }
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| 252 | # h.reject {|k,v| k < "b"} #=> {"b" => 200, "c" => 300}
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| 253 | # h.reject {|k,v| v > 100} #=> {"a" => 100}
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| 254 | #
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| 255 | # 1.8/1.9 Hash#reject returns Hash; ISO says nothing.
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| 256 | #
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| 257 | def reject(&b)
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| 258 | return to_enum :reject unless block_given?
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| 259 |
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| 260 | h = {}
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| 261 | self.each{|k,v|
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| 262 | unless b.call([k, v])
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| 263 | h[k] = v
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| 264 | end
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| 265 | }
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| 266 | h
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| 267 | end
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| 268 |
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| 269 | ##
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| 270 | # call-seq:
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| 271 | # hsh.select! {| key, value | block } -> hsh or nil
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| 272 | # hsh.select! -> an_enumerator
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| 273 | #
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| 274 | # Equivalent to <code>Hash#keep_if</code>, but returns
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| 275 | # <code>nil</code> if no changes were made.
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| 276 | #
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| 277 | # 1.9 Hash#select! returns Hash; ISO says nothing.
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| 278 | #
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| 279 | def select!(&b)
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| 280 | return to_enum :select! unless block_given?
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| 281 |
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| 282 | keys = []
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| 283 | self.each{|k,v|
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| 284 | unless b.call([k, v])
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| 285 | keys.push(k)
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| 286 | end
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| 287 | }
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| 288 | return nil if keys.size == 0
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| 289 | keys.each{|k|
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| 290 | self.delete(k)
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| 291 | }
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| 292 | self
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| 293 | end
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| 294 |
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| 295 | ##
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| 296 | # call-seq:
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| 297 | # hsh.select {|key, value| block} -> a_hash
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| 298 | # hsh.select -> an_enumerator
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| 299 | #
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| 300 | # Returns a new hash consisting of entries for which the block returns true.
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| 301 | #
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| 302 | # If no block is given, an enumerator is returned instead.
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| 303 | #
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| 304 | # h = { "a" => 100, "b" => 200, "c" => 300 }
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| 305 | # h.select {|k,v| k > "a"} #=> {"b" => 200, "c" => 300}
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| 306 | # h.select {|k,v| v < 200} #=> {"a" => 100}
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| 307 | #
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| 308 | # 1.9 Hash#select returns Hash; ISO says nothing
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| 309 | #
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| 310 | def select(&b)
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| 311 | return to_enum :select unless block_given?
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| 312 |
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| 313 | h = {}
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| 314 | self.each{|k,v|
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| 315 | if b.call([k, v])
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| 316 | h[k] = v
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| 317 | end
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| 318 | }
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| 319 | h
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| 320 | end
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| 321 |
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| 322 | ##
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| 323 | # call-seq:
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| 324 | # hsh.rehash -> hsh
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| 325 | #
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| 326 | # Rebuilds the hash based on the current hash values for each key. If
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| 327 | # values of key objects have changed since they were inserted, this
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| 328 | # method will reindex <i>hsh</i>.
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| 329 | #
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| 330 | # h = {"AAA" => "b"}
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| 331 | # h.keys[0].chop!
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| 332 | # h #=> {"AA"=>"b"}
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| 333 | # h["AA"] #=> nil
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| 334 | # h.rehash #=> {"AA"=>"b"}
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| 335 | # h["AA"] #=> "b"
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| 336 | #
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| 337 | def rehash
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| 338 | h = {}
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| 339 | self.each{|k,v|
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| 340 | h[k] = v
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| 341 | }
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| 342 | self.replace(h)
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| 343 | end
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| 344 |
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| 345 | def __update(h)
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| 346 | h.each_key{|k| self[k] = h[k]}
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| 347 | self
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| 348 | end
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| 349 | end
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| 350 |
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| 351 | ##
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| 352 | # Hash is enumerable
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| 353 | #
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| 354 | # ISO 15.2.13.3
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| 355 | class Hash
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| 356 | include Enumerable
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| 357 | end
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