Class: InsertOrderPreservingHash

Inherits:
Hash
  • Object
show all
Includes:
Enumerable
Defined in:
lib/json/ld/extensions.rb

Instance Method Summary collapse

Methods inherited from Hash

ordered

Constructor Details

#initialize(*args, &block) ⇒ InsertOrderPreservingHash

Returns a new instance of InsertOrderPreservingHash.



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# File 'lib/json/ld/extensions.rb', line 97

def initialize(*args, &block)
  super
  @ordered_keys = []
end

Instance Method Details

#[]=(key, val) ⇒ Object 



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# File 'lib/json/ld/extensions.rb', line 102

def []=(key, val)
  @ordered_keys << key unless has_key? key
  super
end

#clear ⇒ Object 



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# File 'lib/json/ld/extensions.rb', line 124

def clear
  @ordered_keys.clear
  super
end

#delete(k, &block) ⇒ Object 



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# File 'lib/json/ld/extensions.rb', line 129

def delete(k, &block)
  @ordered_keys.delete(k)
  super
end

#delete_if(&block) ⇒ Object 



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# File 'lib/json/ld/extensions.rb', line 141

def delete_if(&block)
  reject!(&block)
  self
end

#each ⇒ Object Also known as: each_pair 



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# File 'lib/json/ld/extensions.rb', line 107

def each
  @ordered_keys.each {|k| yield(k, self[k])}
end

#each_key ⇒ Object 



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# File 'lib/json/ld/extensions.rb', line 116

def each_key
  @ordered_keys.each {|k| yield k}
end

#each_value ⇒ Object 



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# File 'lib/json/ld/extensions.rb', line 112

def each_value
  @ordered_keys.each {|k| yield(super[k])}
end

#keys ⇒ Object 



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# File 'lib/json/ld/extensions.rb', line 120

def keys
  @ordered_keys
end

#merge(other) ⇒ Object 



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# File 'lib/json/ld/extensions.rb', line 154

def merge(other)
  self.dup.merge!(other)
end

#merge!(other) ⇒ Object 



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# File 'lib/json/ld/extensions.rb', line 146

def merge!(other)
  new_keys = other.instance_variable_get(:@ordered_keys) || other.keys
  new_keys -= @ordered_keys
  @ordered_keys += new_keys
  super
  self
end

#reject! ⇒ Object 



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# File 'lib/json/ld/extensions.rb', line 134

def reject!
  del = []
  each_pair {|k,v| del << k if yield k,v}
  del.each {|k| delete k}
  del.empty? ? nil : self
end