Class: Eqn::EqnNode

Inherits:

Treetop::Runtime::SyntaxNode

• Object
• Treetop::Runtime::SyntaxNode
• Eqn::EqnNode

Defined in:

lib/eqn/eqn_node.rb

Overview

Eqn parser node with helper methods for cleaning.

Direct Known Subclasses

Comparation, Comparation::CompGroup, Expression, Eqn::Expression::ExprGroup, Function::If, Function::RoundBase, Number, Number::Decimal, Number::Exponent, Number::SignedNumber, Terminal::CompOp, Terminal::Digits, Terminal::Op, Terminal::UnaryMinus, Terminal::Variable

Instance Method Summary

• #clean_tree! ⇒ Object
• #term? ⇒ Boolean

Instance Method Details

#clean_tree! ⇒ Object

# File 'lib/eqn/eqn_node.rb', line 8

def clean_tree!
  # Return if node is a terminal.
  return if term?

  # Delete any cruft syntax nodes.
  elements.delete_if { |node| !node.is_a?(EqnNode) }

  # Recurse over any elements with their own children.
  elements.each(&:clean_tree!)
end

#term? ⇒ Boolean

Returns:

• (Boolean)

# File 'lib/eqn/eqn_node.rb', line 4

def term?
  elements.nil? || elements.empty?
end