class Opal::Nodes::CallNode::DependencyResolver

def expand_path(path, base = '')
  "#{base}/#{path}".split('/').each_with_object([]) do |part, p|
    if part == ''
      # we had '//', so ignore
    elsif part == '..'
      p.pop
    else
      p << part
    end
  end.join '/'
end

def handle_part(sexp)
  type = sexp.type
  if type == :str
    return sexp.children[0]
  elsif type == :send
    recv, meth, *args = sexp.children
    parts = args.map { |s| handle_part s }
    if recv.is_a?(::Opal::AST::Node) && recv.type == :const && recv.children.last == :File
      if meth == :expand_path
        return expand_path(*parts)
      elsif meth == :join
        return expand_path parts.join('/')
      elsif meth == :dirname
        return expand_path parts[0].split('/')[0...-1].join('/')
      end
    end
  end
  msg = 'Cannot handle dynamic require'
  case @compiler.dynamic_require_severity
  when :error
    @compiler.error msg, @sexp.line
  when :warning
    @compiler.warning msg, @sexp.line
  end
end

def initialize(compiler, sexp)
  @compiler = compiler
  @sexp = sexp
end

def resolve
  handle_part @sexp
end