Module: Propose::Visitor

Included in:
AtomFinder
Defined in:
lib/propose/visitor.rb

Overview

Provides basic functionality for traversing a parse tree.

Classes which include this module can define methods such as ‘visit_conjunction` to have the visitor visit all conjunctions in the parse tree.

Instance Method Summary collapse

Instance Method Details

#visit(node) ⇒ Object 



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# File 'lib/propose/visitor.rb', line 8

def visit(node)
  # Keep track of whether this block was consumed by the visitor. This
  # allows us to visit all nodes by default, but can override the behavior
  # by specifying `yield false` in a visit method, indicating that no
  # further visiting should occur for the current node's children.
  block_called = false

  block = ->(descend = :children) do
    block_called = true
    visit_children(node) if descend == :children
  end

  method = "visit_#{node_name(node)}"

  send(method, node, &block) if respond_to?(method, true)

  visit_children(node) unless block_called
end