Class: Dhaka::LexerSupport::OrNode

Inherits:
ASTNode
  • Object
show all
Defined in:
lib/dhaka/lexer/regex_grammar.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from ASTNode

#accepting, #checkpoint

Constructor Details

#initialize(*children) ⇒ OrNode

Returns a new instance of OrNode.



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# File 'lib/dhaka/lexer/regex_grammar.rb', line 162

def initialize(*children)
  @children = children
end

Instance Attribute Details

#children ⇒ Object (readonly)

Returns the value of attribute children.



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# File 'lib/dhaka/lexer/regex_grammar.rb', line 161

def children
  @children
end

Instance Method Details

#calculate_follow_sets ⇒ Object 



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# File 'lib/dhaka/lexer/regex_grammar.rb', line 197

def calculate_follow_sets
  children.each do |child|
    child.calculate_follow_sets
  end
end

#first ⇒ Object 



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# File 'lib/dhaka/lexer/regex_grammar.rb', line 173

def first
  result = Set.new
  children.each do |child|
    result.merge child.first
  end
  result
end

#label ⇒ Object 



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# File 'lib/dhaka/lexer/regex_grammar.rb', line 165

def label
  "|"
end

#last ⇒ Object 



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# File 'lib/dhaka/lexer/regex_grammar.rb', line 181

def last
  result = Set.new
  children.each do |child|
    result.merge child.last
  end
  result
end

#nullable ⇒ Object 



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# File 'lib/dhaka/lexer/regex_grammar.rb', line 169

def nullable
  children.any? {|child| child.nullable}
end

#to_dot(graph) ⇒ Object 



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# File 'lib/dhaka/lexer/regex_grammar.rb', line 189

def to_dot(graph)
  graph.node(self, :label => label)
  children.each do |child|
    graph.edge(self, child)
    child.to_dot(graph)
  end
end