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 | raise TypeError, "can't convert argument into Hash" unless hash.respond_to?(:to_hash)
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158 | self.clear
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159 | hash = hash.to_hash
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160 | hash.each_key{|k|
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161 | self[k] = hash[k]
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162 | }
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163 | if hash.default_proc
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164 | self.default_proc = hash.default_proc
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165 | else
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166 | self.default = hash.default
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167 | end
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168 | self
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169 | end
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170 | # ISO 15.2.13.4.17
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171 | alias initialize_copy replace
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172 |
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173 | ##
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174 | # Return a hash which contains the content of
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175 | # +self+ and +other+. If a block is given
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176 | # it will be called for each element with
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177 | # a duplicate key. The value of the block
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178 | # will be the final value of this element.
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179 | #
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180 | # ISO 15.2.13.4.22
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181 | def merge(other, &block)
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182 | h = {}
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183 | raise TypeError, "can't convert argument into Hash" unless other.respond_to?(:to_hash)
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184 | other = other.to_hash
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185 | self.each_key{|k| h[k] = self[k]}
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186 | if block
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187 | other.each_key{|k|
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188 | h[k] = (self.has_key?(k))? block.call(k, self[k], other[k]): other[k]
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189 | }
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190 | else
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191 | other.each_key{|k| h[k] = other[k]}
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192 | end
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193 | h
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194 | end
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195 |
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196 | # internal method for Hash inspection
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197 | def _inspect
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198 | return "{}" if self.size == 0
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199 | "{"+self.map {|k,v|
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200 | k._inspect + "=>" + v._inspect
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201 | }.join(", ")+"}"
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202 | end
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203 | ##
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204 | # Return the contents of this hash as a string.
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205 | #
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206 | # ISO 15.2.13.4.30 (x)
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207 | def inspect
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208 | begin
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209 | self._inspect
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210 | rescue SystemStackError
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211 | "{...}"
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212 | end
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213 | end
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214 | # ISO 15.2.13.4.31 (x)
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215 | alias to_s inspect
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216 |
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217 | ##
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218 | # call-seq:
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219 | # hsh.reject! {| key, value | block } -> hsh or nil
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220 | # hsh.reject! -> an_enumerator
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221 | #
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222 | # Equivalent to <code>Hash#delete_if</code>, but returns
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223 | # <code>nil</code> if no changes were made.
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224 | #
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225 | # 1.8/1.9 Hash#reject! returns Hash; ISO says nothing.
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226 | #
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227 | def reject!(&b)
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228 | return to_enum :reject! unless block_given?
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229 |
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230 | keys = []
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231 | self.each{|k,v|
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232 | if b.call([k, v])
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233 | keys.push(k)
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234 | end
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235 | }
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236 | return nil if keys.size == 0
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237 | keys.each{|k|
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238 | self.delete(k)
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239 | }
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240 | self
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241 | end
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242 |
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243 | ##
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244 | # call-seq:
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245 | # hsh.reject {|key, value| block} -> a_hash
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246 | # hsh.reject -> an_enumerator
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247 | #
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248 | # Returns a new hash consisting of entries for which the block returns false.
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249 | #
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250 | # If no block is given, an enumerator is returned instead.
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251 | #
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252 | # h = { "a" => 100, "b" => 200, "c" => 300 }
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253 | # h.reject {|k,v| k < "b"} #=> {"b" => 200, "c" => 300}
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254 | # h.reject {|k,v| v > 100} #=> {"a" => 100}
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255 | #
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256 | # 1.8/1.9 Hash#reject returns Hash; ISO says nothing.
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257 | #
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258 | def reject(&b)
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259 | return to_enum :reject unless block_given?
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260 |
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261 | h = {}
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262 | self.each{|k,v|
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263 | unless b.call([k, v])
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264 | h[k] = v
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265 | end
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266 | }
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267 | h
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268 | end
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269 |
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270 | ##
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271 | # call-seq:
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272 | # hsh.select! {| key, value | block } -> hsh or nil
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273 | # hsh.select! -> an_enumerator
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274 | #
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275 | # Equivalent to <code>Hash#keep_if</code>, but returns
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276 | # <code>nil</code> if no changes were made.
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277 | #
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278 | # 1.9 Hash#select! returns Hash; ISO says nothing.
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279 | #
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280 | def select!(&b)
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281 | return to_enum :select! unless block_given?
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282 |
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283 | keys = []
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284 | self.each{|k,v|
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285 | unless b.call([k, v])
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286 | keys.push(k)
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287 | end
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288 | }
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289 | return nil if keys.size == 0
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290 | keys.each{|k|
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291 | self.delete(k)
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292 | }
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293 | self
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294 | end
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295 |
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296 | ##
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297 | # call-seq:
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298 | # hsh.select {|key, value| block} -> a_hash
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299 | # hsh.select -> an_enumerator
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300 | #
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301 | # Returns a new hash consisting of entries for which the block returns true.
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302 | #
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303 | # If no block is given, an enumerator is returned instead.
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304 | #
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305 | # h = { "a" => 100, "b" => 200, "c" => 300 }
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306 | # h.select {|k,v| k > "a"} #=> {"b" => 200, "c" => 300}
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307 | # h.select {|k,v| v < 200} #=> {"a" => 100}
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308 | #
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309 | # 1.9 Hash#select returns Hash; ISO says nothing
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310 | #
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311 | def select(&b)
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312 | return to_enum :select unless block_given?
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313 |
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314 | h = {}
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315 | self.each{|k,v|
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316 | if b.call([k, v])
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317 | h[k] = v
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318 | end
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319 | }
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320 | h
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321 | end
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322 |
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323 | ##
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324 | # call-seq:
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325 | # hsh.rehash -> hsh
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326 | #
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327 | # Rebuilds the hash based on the current hash values for each key. If
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328 | # values of key objects have changed since they were inserted, this
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329 | # method will reindex <i>hsh</i>.
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330 | #
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331 | # h = {"AAA" => "b"}
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332 | # h.keys[0].chop!
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333 | # h #=> {"AA"=>"b"}
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334 | # h["AA"] #=> nil
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335 | # h.rehash #=> {"AA"=>"b"}
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336 | # h["AA"] #=> "b"
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337 | #
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338 | def rehash
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339 | h = {}
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340 | self.each{|k,v|
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341 | h[k] = v
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342 | }
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343 | self.replace(h)
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344 | end
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345 |
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346 | def __update(h)
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347 | h.each_key{|k| self[k] = h[k]}
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348 | self
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349 | end
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350 | end
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351 |
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352 | ##
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353 | # Hash is enumerable
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354 | #
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355 | # ISO 15.2.13.3
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356 | class Hash
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357 | include Enumerable
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358 | end
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