class OrderedHash
AUTHOR
jan molic /mig/at/1984/dot/cz/
DESCRIPTION
Hash with preserved order and some array-like extensions Public domain.
THANKS
Andrew Johnson for his suggestions and fixes of Hash[], merge, to_a, inspect and shift
Attributes
Public Class Methods
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# File lib/orderedhash.rb, line 16 def [] *args hsh = OrderedHash.new if Hash === args[0] hsh.replace args[0] elsif (args.size % 2) != 0 raise ArgumentError, "odd number of elements for Hash" else 0.step(args.size - 1, 2) do |a| b = a + 1 hsh[args[a]] = args[b] end end hsh end
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# File lib/orderedhash.rb, line 31 def initialize(*a, &b) super @order = [] end
Calls superclass method
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# File lib/orderedhash.rb, line 177 def to_yaml opts = {} begin @__yaml_inline ? @__yaml_inline_meth[ opts ] : super rescue @to_yaml_style = :inline super end end
Calls superclass method
Public Instance Methods
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# File lib/orderedhash.rb, line 44 def == hsh2 return false if @order != hsh2.order super hsh2 end
Calls superclass method
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# File lib/orderedhash.rb, line 48 def clear @order = [] super end
Calls superclass method
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# File lib/orderedhash.rb, line 52 def delete key @order.delete key super end
Calls superclass method
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# File lib/orderedhash.rb, line 69 def delete_if @order.clone.each { |k| delete k if yield(k) } self end
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# File lib/orderedhash.rb, line 64 def each @order.each { |k| yield k,self[k] } self end
Also aliased as: each_pair
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# File lib/orderedhash.rb, line 56 def each_key @order.each { |k| yield k } self end
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# File lib/orderedhash.rb, line 60 def each_value @order.each { |k| yield self[k] } self end
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# File lib/orderedhash.rb, line 192 def each_with_index @order.each_with_index { |k, index| yield k, self[k], index } self end
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# File lib/orderedhash.rb, line 83 def first {@order.first => self[@order.first]} end
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# File lib/orderedhash.rb, line 139 def inspect ary = [] each {|k,v| ary << k.inspect + "=>" + v.inspect} '{' + ary.join(", ") + '}' end
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# File lib/orderedhash.rb, line 89 def invert hsh2 = Hash.new @order.each { |k| hsh2[self[k]] = k } hsh2 end
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# File lib/orderedhash.rb, line 127 def pop key = @order.last key ? [key,delete(key)] : nil end
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# File lib/orderedhash.rb, line 118 def push k,v unless self.include? k @order.push k orig_store(k,v) true else false end end
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# File lib/orderedhash.rb, line 94 def reject &block self.dup.delete_if &block end
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# File lib/orderedhash.rb, line 97 def reject! &block hsh2 = reject &block self == hsh2 ? nil : hsh2 end
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# File lib/orderedhash.rb, line 101 def replace hsh2 @order = hsh2.keys super hsh2 end
Calls superclass method
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# File lib/orderedhash.rb, line 152 def select ary = [] each { |k,v| ary << [k,v] if yield k,v } ary end
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# File lib/orderedhash.rb, line 105 def shift key = @order.first key ? [key,delete(key)] : super end
Calls superclass method
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# File lib/orderedhash.rb, line 39 def store a,b @order.push a unless has_key? a super a,b end
Calls superclass method
Also aliased as: orig_store, []=
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# File lib/orderedhash.rb, line 131 def to_a ary = [] each { |k,v| ary << [k,v] } ary end
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# File lib/orderedhash.rb, line 109 def unshift k,v unless self.include? k @order.unshift k orig_store(k,v) true else false end end
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# File lib/orderedhash.rb, line 144 def update hsh2 hsh2.each { |k,v| self[k] = v } self end
Also aliased as: merge!
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# File lib/orderedhash.rb, line 75 def values ary = [] @order.each { |k| ary.push self[k] } ary end
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# File lib/orderedhash.rb, line 190 def yaml_inline!() self.yaml_inline = true end
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# File lib/orderedhash.rb, line 165 def yaml_inline= bool if respond_to?("to_yaml_style") self.to_yaml_style = :inline else unless defined? @__yaml_inline_meth @__yaml_inline_meth = lambda {|opts| YAML::quick_emit(object_id, opts) {|emitter| emitter << '{ ' << map{|kv| kv.join ': '}.join(', ') << ' }' } } class << self def to_yaml opts = {} begin @__yaml_inline ? @__yaml_inline_meth[ opts ] : super rescue @to_yaml_style = :inline super end end end end end @__yaml_inline = bool end