Module: Mbrao::ParserInterface::ClassMethods

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# File 'lib/mbrao/parser_interface.rb', line 21

module ClassMethods
  attr_accessor :locale
  attr_accessor :parsing_engine
  attr_accessor :rendering_engine

  # Gets the default locale for mbrao.
  #
  # @return [String] The default locale.
  def locale
    attribute_or_default(@locale, "en")
  end

  # Gets the default parsing engine.
  #
  # @return [String] The default parsing engine.
  def parsing_engine
    attribute_or_default(@parsing_engine, :plain_text, :to_sym)
  end

  # Gets the default rendering engine.
  #
  # @return [String] The default rendering engine.
  def rendering_engine
    attribute_or_default(@rendering_engine, :html_pipeline, :to_sym)
  end

  # Parses a source text.
  #
  # @param content [Object] The content to parse.
  # @param options [Hash] A list of options for parsing.
  # @return [Content] The parsed data.
  def parse(content, options = {})
    instance.parse(content, options)
  end

  # Renders a content.
  #
  # @param content [Content] The content to parse.
  # @param options [Hash] A list of options for renderer.
  # @param context [Hash] A context for rendering.
  # @return [String] The rendered content.
  def render(content, options = {}, context = {})
    instance.render(content, options, context)
  end

  # Returns an object as a JSON compatible hash
  #
  # @param target [Object] The target to serialize.
  # @param keys [Array] The attributes to include in the serialization.
  # @param options [Hash] Options to modify behavior of the serialization.
  #   The only supported value are:
  #
  #   * `:exclude`, an array of attributes to skip.
  #   * `:exclude_empty`, if to exclude nil values. Default is `false`.
  # @return [Hash] An hash with all attributes.
  def as_json(target, keys, options = {})
    include_empty = !options[:exclude_empty].to_boolean
    exclude = options[:exclude].ensure_array(no_duplicates: true, compact: true, flatten: true, sanitizer: :ensure_string)
    keys = keys.ensure_array(no_duplicates: true, compact: true, flatten: true, sanitizer: :ensure_string)

    map_to_json(target, (keys - exclude), include_empty)
  end

  # Instantiates a new engine for rendering or parsing.
  #
  # @param cls [String|Symbol|Object] If a `String` or a `Symbol`, then it will be the class of the engine.
  # @param type [Symbol] The type or engine. Can be `:parsing` or `:rendering`.
  # @return [Object] A new engine.
  def create_engine(cls, type = :parsing)
    type = :parsing if type != :rendering
    ::Lazier.find_class(cls, "::Mbrao::#{type.to_s.classify}Engines::%CLASS%").new
  rescue NameError
    raise Mbrao::Exceptions::UnknownEngine
  end

  # Returns a unique (singleton) instance of the parser.
  #
  # @param force [Boolean] If to force recreation of the instance.
  # @return [Parser] The unique (singleton) instance of the parser.
  def instance(force = false)
    @instance = nil if force
    @instance ||= Mbrao::Parser.new
  end

  private

  # :nodoc:
  def attribute_or_default(attr, default_value = nil, sanitizer = :ensure_string)
    rv = attr.present? ? attr : default_value
    rv = rv.send(sanitizer) if sanitizer
    rv
  end

  # :nodoc:
  def map_to_json(target, keys, include_empty)
    json = keys.reduce({}) do |rv, key|
      value = get_json_field(target, key)
      rv[key] = value if include_empty || value.present?
      rv
    end

    json.deep_stringify_keys
  end

  # :nodoc:
  def get_json_field(target, method)
    value = target.send(method)
    value = value.as_json if value && value.respond_to?(:as_json) && !value.is_a?(Symbol)
    value
  end
end

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# File 'lib/mbrao/parser_interface.rb', line 21

module ClassMethods
  attr_accessor :locale
  attr_accessor :parsing_engine
  attr_accessor :rendering_engine

  # Gets the default locale for mbrao.
  #
  # @return [String] The default locale.
  def locale
    attribute_or_default(@locale, "en")
  end

  # Gets the default parsing engine.
  #
  # @return [String] The default parsing engine.
  def parsing_engine
    attribute_or_default(@parsing_engine, :plain_text, :to_sym)
  end

  # Gets the default rendering engine.
  #
  # @return [String] The default rendering engine.
  def rendering_engine
    attribute_or_default(@rendering_engine, :html_pipeline, :to_sym)
  end

  # Parses a source text.
  #
  # @param content [Object] The content to parse.
  # @param options [Hash] A list of options for parsing.
  # @return [Content] The parsed data.
  def parse(content, options = {})
    instance.parse(content, options)
  end

  # Renders a content.
  #
  # @param content [Content] The content to parse.
  # @param options [Hash] A list of options for renderer.
  # @param context [Hash] A context for rendering.
  # @return [String] The rendered content.
  def render(content, options = {}, context = {})
    instance.render(content, options, context)
  end

  # Returns an object as a JSON compatible hash
  #
  # @param target [Object] The target to serialize.
  # @param keys [Array] The attributes to include in the serialization.
  # @param options [Hash] Options to modify behavior of the serialization.
  #   The only supported value are:
  #
  #   * `:exclude`, an array of attributes to skip.
  #   * `:exclude_empty`, if to exclude nil values. Default is `false`.
  # @return [Hash] An hash with all attributes.
  def as_json(target, keys, options = {})
    include_empty = !options[:exclude_empty].to_boolean
    exclude = options[:exclude].ensure_array(no_duplicates: true, compact: true, flatten: true, sanitizer: :ensure_string)
    keys = keys.ensure_array(no_duplicates: true, compact: true, flatten: true, sanitizer: :ensure_string)

    map_to_json(target, (keys - exclude), include_empty)
  end

  # Instantiates a new engine for rendering or parsing.
  #
  # @param cls [String|Symbol|Object] If a `String` or a `Symbol`, then it will be the class of the engine.
  # @param type [Symbol] The type or engine. Can be `:parsing` or `:rendering`.
  # @return [Object] A new engine.
  def create_engine(cls, type = :parsing)
    type = :parsing if type != :rendering
    ::Lazier.find_class(cls, "::Mbrao::#{type.to_s.classify}Engines::%CLASS%").new
  rescue NameError
    raise Mbrao::Exceptions::UnknownEngine
  end

  # Returns a unique (singleton) instance of the parser.
  #
  # @param force [Boolean] If to force recreation of the instance.
  # @return [Parser] The unique (singleton) instance of the parser.
  def instance(force = false)
    @instance = nil if force
    @instance ||= Mbrao::Parser.new
  end

  private

  # :nodoc:
  def attribute_or_default(attr, default_value = nil, sanitizer = :ensure_string)
    rv = attr.present? ? attr : default_value
    rv = rv.send(sanitizer) if sanitizer
    rv
  end

  # :nodoc:
  def map_to_json(target, keys, include_empty)
    json = keys.reduce({}) do |rv, key|
      value = get_json_field(target, key)
      rv[key] = value if include_empty || value.present?
      rv
    end

    json.deep_stringify_keys
  end

  # :nodoc:
  def get_json_field(target, method)
    value = target.send(method)
    value = value.as_json if value && value.respond_to?(:as_json) && !value.is_a?(Symbol)
    value
  end
end