Class: Rley::RGN::SymbolNode

Inherits:
ASTNode
  • Object
show all
Defined in:
lib/rley/rgn/symbol_node.rb

Overview

A syntax node for a grammar symbol occurring in rhs of a rule. symbol nodes are leaf nodes of RRN parse trees.

Instance Attribute Summary collapse

Attributes inherited from ASTNode

#annotation

Instance Method Summary collapse

Methods inherited from ASTNode

#annotation_to_text, #done!

Constructor Details

#initialize(aPosition, aName) ⇒ SymbolNode

Returns a new instance of SymbolNode.

Parameters:

  • aPosition (Rley::Lexical::Position) —

    Position of the entry in the input stream.

  • aName (String) —

    name of grammar symbol



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# File 'lib/rley/rgn/symbol_node.rb', line 18

def initialize(aPosition, aName)
  super()
  @position = aPosition
  @name = aName
end

Instance Attribute Details

#name ⇒ String (readonly)

Returns name of grammar symbol.

Returns:

  • (String) —

    name of grammar symbol



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# File 'lib/rley/rgn/symbol_node.rb', line 14

def name
  @name
end

#position ⇒ Rley::Lexical::Position (readonly)

Returns Position of the entry in the input stream.

Returns:



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# File 'lib/rley/rgn/symbol_node.rb', line 11

def position
  @position
end

Instance Method Details

#accept(visitor) ⇒ Object

Abstract method (must be overriden in subclasses). Part of the 'visitee' role in Visitor design pattern.

Parameters:



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

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

#to_text ⇒ String

Returns name of grammar symbol.

Returns:

  • (String) —

    name of grammar symbol



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# File 'lib/rley/rgn/symbol_node.rb', line 25

def to_text
  annotation.empty? ? name : "#{name} #{annotation_to_text}"
end