class EacRubyUtils::PathsHash

def [](entry_key)
  root.read_entry(self.class.parse_entry_key(entry_key), [])
end

def []=(entry_key, entry_value)
  root.write_entry(self.class.parse_entry_key(entry_key), entry_value, [])
end

def initialize(source_hash = {})
  @root = Node.new(source_hash)
end

def parse_entry_key(entry_key)
  r = entry_key.to_s.strip
  raise EntryKeyError, 'Entry key cannot start or end with dot' if
  r.start_with?('.') || r.end_with?('.')
  r = r.split('.').map(&:strip)
  raise EntryKeyError, "Entry key \"#{entry_key}\" is empty" if r.empty?
  return r.map(&:to_sym) unless r.any?(&:blank?)
  raise EntryKeyError, "Entry key \"#{entry_key}\" has at least one blank part"
end