Class: Solargraph::Rails::Delegate

Inherits:
Object
  • Object
show all
Defined in:
lib/solargraph/rails/delegate.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.instance ⇒ Object 



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# File 'lib/solargraph/rails/delegate.rb', line 6

def self.instance
  @instance ||= self.new
end

.supported? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/solargraph/rails/delegate.rb', line 10

def self.supported?
  Solargraph::Pin.const_defined?(:DelegatedMethod)
end

Instance Method Details

#process(source_map, ns) ⇒ Object 



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# File 'lib/solargraph/rails/delegate.rb', line 14

def process(source_map, ns)
  return [] unless self.class.supported?
  return [] unless source_map.code.include?('delegate')

  walker = Walker.from_source(source_map.source)
  pins = []

  walker.on :send, [nil, :delegate] do |ast|
    last_child = ast.children[-1]
    next unless last_child.instance_of?(::Parser::AST::Node) && last_child.type == :hash

    methods = ast.children[2...-1].select { |c| c.type == :sym }

    delegate_node = Util.extract_option(ast, :to)
    next unless delegate_node

    chain = if delegate_node.type == :sym
      # `delegate ..., to: :bar` means call the #bar method to get the delegate object
      call = Solargraph::Source::Chain::Call.new(delegate_node.children[0].to_s)
      Solargraph::Source::Chain.new([call], delegate_node)
    else
      # for any other type of delegate, we create a chain from the AST node
      Solargraph::Parser::Legacy::NodeChainer.chain(delegate_node, ns.filename)
    end

    prefix_node = Util.extract_option(ast, :prefix)

    prefix = nil
    if prefix_node
      if prefix_node.type == :sym
        prefix = prefix_node.children[0]
      elsif prefix_node.type == :true && delegate_node.type == :sym
        prefix = delegate_node.children[0]
      end
    end

    location = Util.build_location(delegate_node, ns.filename)
    methods.each do |meth|
      method_name = meth.children[0]
      pins << Solargraph::Pin::DelegatedMethod.new(
        closure: ns,
        scope: :instance,
        name: [prefix, method_name].select(&:itself).join("_"),
        node: meth,
        receiver: chain,
        receiver_method_name: method_name.to_s,
      )
    end
  end

  walker.walk

  if pins.any?
    Solargraph.logger.debug(
      "[Rails][Delegate] added #{pins.map(&:name)} to #{ns.path}"
    )
  end

  pins
end