Class: Rley::PTree::TerminalNode

Inherits:
ParseTreeNode show all
Defined in:
lib/rley/ptree/terminal_node.rb

Instance Attribute Summary collapse

Attributes inherited from ParseTreeNode

#range, #symbol

Instance Method Summary collapse

Constructor Details

#initialize(aToken, aPos) ⇒ TerminalNode

Returns a new instance of TerminalNode.

Parameters:

  • aToken (Lexical::Token) —

    Input Token object

  • aPos (Integer) —

    position of the token in the input stream.



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# File 'lib/rley/ptree/terminal_node.rb', line 11

def initialize(aToken, aPos)
  # (major, minor) =  
  
  # Use '1.class' trick to support both Integer and Fixnum classes
  range = aPos.kind_of?(1.class) ? { low: aPos, high: aPos + 1 } : aPos
  super(aToken.terminal, range)
  @token = aToken
end

Instance Attribute Details

#token ⇒ Lexical::Token (readonly)

Returns the input token.

Returns:



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# File 'lib/rley/ptree/terminal_node.rb', line 7

def token
  @token
end

Instance Method Details

#accept(aVisitor) ⇒ Object

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

Parameters:



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# File 'lib/rley/ptree/terminal_node.rb', line 34

def accept(aVisitor)
  aVisitor.visit_terminal(self)
end

#to_s ⇒ Object

Emit a short string representation of the node. Mainly used for diagnosis/debugging purposes.



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# File 'lib/rley/ptree/terminal_node.rb', line 28

def to_s()
  return super + ": '#{token.lexeme}'"
end

#to_string(indentation) ⇒ Object

Emit a (formatted) string representation of the node. Mainly used for diagnosis/debugging purposes.



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# File 'lib/rley/ptree/terminal_node.rb', line 22

def to_string(indentation)
  return super + ": '#{token.lexeme}'"
end