module RuboCop::Ext::RegexpNode

Extensions to AST::RegexpNode for our cached parsed regexp info

Constants

ANY

Attributes

parsed_tree[R]

@return [Regexp::Expression::Root, nil] Note: we extend Regexp nodes to provide ‘loc` and `expression` see `ext/regexp_parser`.

Public Instance Methods

assign_properties(*) click to toggle source
Calls superclass method
# File lib/rubocop/ext/regexp_node.rb, line 19
def assign_properties(*)
  super

  str = with_interpolations_blanked
  @parsed_tree = begin
    Regexp::Parser.parse(str, options: options)
  rescue StandardError
    nil
  end
  origin = loc.begin.end
  @parsed_tree&.each_expression(true) { |e| e.origin = origin }
end
each_capture(named: ANY) { |exp| ... } click to toggle source
# File lib/rubocop/ext/regexp_node.rb, line 53
def each_capture(named: ANY)
  return enum_for(__method__, named: named) unless block_given?

  parsed_tree&.traverse do |event, exp, _index|
    yield(exp) if event == :enter &&
                  named == exp.respond_to?(:name) &&
                  exp.respond_to?(:capturing?) &&
                  exp.capturing?
  end

  self
end

Private Instance Methods

with_interpolations_blanked() click to toggle source
# File lib/rubocop/ext/regexp_node.rb, line 68
def with_interpolations_blanked
  # Ignore the trailing regopt node
  children[0...-1].map do |child|
    source = child.source

    # We don't want to consider the contents of interpolations as part of the pattern source,
    # but need to preserve their width, to allow offsets to correctly line up with the
    # original source: spaces have no effect, and preserve width.
    if child.begin_type?
      ' ' * source.length
    else
      source
    end
  end.join
end