Class: Sol::Nodes

Inherits:
Struct
  • Object
show all
Defined in:
lib/sol/nodes.rb,
lib/sol/interpreter.rb

Overview

Collection of nodes each one representing an expression.

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#nodes ⇒ Object

Returns the value of attribute nodes

Returns:

  • (Object) —

    the current value of nodes



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# File 'lib/sol/nodes.rb', line 4

def nodes
  @nodes
end

Instance Method Details

#<<(node) ⇒ Object 



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# File 'lib/sol/nodes.rb', line 6

def <<(node)

  nodes << node

  return self

end

#eval(context) ⇒ Object

This method is the “interpreter” part of our language. All nodes know how to eval itself and returns the result of its evaluation by implementing the “eval” method. The “context” variable is the environment in which the node is evaluated (local variables, current class, etc.).



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# File 'lib/sol/interpreter.rb', line 27

def eval(context)

	return_value = nil

	nodes.each do |node|

		return_value = node.eval(context)

	end

	# The last value evaluated in a method is the return value. Or null if node
	return_value || RuntimeModel::Runtime["null"]

end