module RuboCop::AST::NodePattern::Macros

return the captures, or `true` if there were none.
If the node matches, and no block is provided, the new method will
yield to the block (passing any captures as block arguments).
If the node matches, and a block is provided, the new method will
The new method will return nil if the node does not match

Define a method which applies a pattern to an AST node

def def_node_matcher(method_name, pattern_str, **keyword_defaults)
  Compiler.new(pattern_str, 'node')
          .def_node_matcher(self, method_name, **keyword_defaults)
end

yield all descendants which match.
as soon as it finds a descendant which matches. Otherwise, it will
If the method name ends with '?', the new method will return `true`

checking whether any of them match the provided pattern
Define a method which recurses over the descendants of an AST node,

def def_node_search(method_name, pattern_str, **keyword_defaults)
  Compiler.new(pattern_str, 'node0', 'node')
          .def_node_search(self, method_name, **keyword_defaults)
end