Module: LibXML::XML::XQuery::Uniqueness

Extended by:
Forwardable
Defined in:
lib/libxml/xquery/uniqueness.rb

Constant Summary collapse

DELEGATORS = 
%w[to_a each length size]

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.included(base) ⇒ Object 



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# File 'lib/libxml/xquery/uniqueness.rb', line 79

def self.included(base)
  base.send(:alias_method, :_xquery_original_to_a, :to_a)

  # overwrite original methods
  instance_methods.each { |method|
    base.send(:define_method, method, instance_method(method))
  }
end

Instance Method Details

#to_a ⇒ Object 



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# File 'lib/libxml/xquery/uniqueness.rb', line 37

def to_a
  if @_uniq
    # return unique nodes according to their #to_s
    seen = Hash.new { |h, k| h[k] = true; false }
    uniq = []

    _xquery_original_to_a.each { |n|
      uniq << n unless seen[n.to_s]
    }

    uniq
  else
    _xquery_original_to_a
  end
end

#uniq ⇒ Object 



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# File 'lib/libxml/xquery/uniqueness.rb', line 53

def uniq
  proxy = self.class.new.uniq!
  proxy.instance_variable_set(:@_this, self)

  class << proxy
    (instance_methods.map { |m| m.to_s } - DELEGATORS).each { |method|
      undef_method(method) unless method =~ /\A__/ || method == 'object_id'
    }

    def method_missing(*args)
      block_given? ? @_this.send(*args) { |a| yield a } : @_this.send(*args)
    end
  end

  proxy
end

#uniq! ⇒ Object 



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# File 'lib/libxml/xquery/uniqueness.rb', line 70

def uniq!
  @_uniq = true
  self
end

#uniq? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/libxml/xquery/uniqueness.rb', line 75

def uniq?
  @_uniq
end