Class: Rley::SPPF::CompositeNode

Inherits:
SPPFNode
  • Object
show all
Defined in:
lib/rley/sppf/composite_node.rb,
lib/rley/parse_forest_visitor.rb

Overview

Monkey-patching

Direct Known Subclasses

AlternativeNode, NonTerminalNode

Instance Attribute Summary collapse

Attributes inherited from SPPFNode

#range

Instance Method Summary collapse

Methods inherited from SPPFNode

#origin

Constructor Details

#initialize(aRange) ⇒ CompositeNode

Constructor

Parameters:



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# File 'lib/rley/sppf/composite_node.rb', line 17

def initialize(aRange)
  super(aRange)
  @subnodes = []
end

Instance Attribute Details

#signatures ⇒ Object (readonly)

Returns the value of attribute signatures.



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# File 'lib/rley/parse_forest_visitor.rb', line 10

def signatures
  @signatures
end

#subnodes ⇒ Array<SPFFNode> (readonly) Also known as: children

Returns Sub-nodes (children).

Returns:

  • (Array<SPFFNode>) —

    Sub-nodes (children).



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# File 'lib/rley/sppf/composite_node.rb', line 11

def subnodes
  @subnodes
end

Instance Method Details

#add_edge_signatures(prime_enumerator) ⇒ Object

Associate for each edge between this node and each subnode an unique prime number (called a signature).



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# File 'lib/rley/parse_forest_visitor.rb', line 14

def add_edge_signatures(prime_enumerator)
  @signatures = subnodes.map { |_| prime_enumerator.next }
end

#add_subnode(aSubnode) ⇒ Object

Add a sub-node (child) to this one.

Parameters:



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# File 'lib/rley/sppf/composite_node.rb', line 24

def add_subnode(aSubnode)
  subnodes.unshift(aSubnode)
end

#inspect ⇒ String

Returns a text representation of the node.

Returns:

  • (String) —

    a text representation of the node.



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# File 'lib/rley/sppf/composite_node.rb', line 29

def inspect
  key
end

#key ⇒ String

Returns:

  • (String) 


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# File 'lib/rley/sppf/composite_node.rb', line 34

def key
  @key ||= to_string(0)
end

#signature_exist? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rley/parse_forest_visitor.rb', line 18

def signature_exist?
  !@signatures.nil?
end