Class: Rley::RGN::RepetitionNode

Inherits:
CompositeNode show all
Defined in:
lib/rley/rgn/repetition_node.rb

Overview

A RGN syntax node representing an expression quantified by a ?, * or +.

Constant Summary collapse

Repetition2suffix = 
{
  zero_or_one: '_qmark',
  zero_or_more: '_star',
  exactly_one: '',
  one_or_more: '_plus'
}.freeze

Instance Attribute Summary collapse

Attributes inherited from CompositeNode

#constraints, #subnodes

Attributes inherited from ASTNode

#annotation

Instance Method Summary collapse

Methods inherited from CompositeNode

#size

Methods inherited from ASTNode

#annotation_to_text, #done!

Constructor Details

#initialize(child, theRepetition) ⇒ RepetitionNode

Returns a new instance of RepetitionNode.

Parameters:

  • child (Array<ASTNode>) —

    sequence of AST nodes

  • theRepetition (Symbol) —

    how many times the child node can be repeated



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# File 'lib/rley/rgn/repetition_node.rb', line 21

def initialize(child, theRepetition)
  super([child])
  @repetition = theRepetition
end

Instance Attribute Details

#repetition ⇒ Symbol

Returns one of: :zero_or_one, :zero_or_more, :one_or_more.

Returns:

  • (Symbol) —

    one of: :zero_or_one, :zero_or_more, :one_or_more



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# File 'lib/rley/rgn/repetition_node.rb', line 10

def repetition
  @repetition
end

Instance Method Details

#accept(visitor) ⇒ Object

Part of the 'visitee' role in Visitor design pattern.

Parameters:



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# File 'lib/rley/rgn/repetition_node.rb', line 45

def accept(visitor)
  visitor.visit_repetition_node(self)
end

#child ⇒ RGN::ASTNode

Returns:



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# File 'lib/rley/rgn/repetition_node.rb', line 27

def child
  subnodes[0]
end

#name ⇒ String

Returns:

  • (String) 


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# File 'lib/rley/rgn/repetition_node.rb', line 32

def name
  child_name = subnodes[0].name
  "rep_#{child_name}#{Repetition2suffix[repetition]}"
end

#suffix_plus ⇒ Object 



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# File 'lib/rley/rgn/repetition_node.rb', line 57

def suffix_plus
  Repetition2suffix[:one_or_more]
end

#suffix_qmark ⇒ Object 



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# File 'lib/rley/rgn/repetition_node.rb', line 49

def suffix_qmark
  Repetition2suffix[:zero_or_one]
end

#suffix_star ⇒ Object 



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# File 'lib/rley/rgn/repetition_node.rb', line 53

def suffix_star
  Repetition2suffix[:zero_or_more]
end

#to_text ⇒ String

Returns:

  • (String) 


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# File 'lib/rley/rgn/repetition_node.rb', line 38

def to_text
  child_text = subnodes[0].to_text
  "rep_#{child_text}#{Repetition2suffix[repetition]}"
end