Class: LiquidStream::Stream

Inherits:
Liquid::Drop
  • Object
show all
Defined in:
lib/liquid_stream/stream.rb

Direct Known Subclasses

Streams

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(source = nil, stream_context = {}) ⇒ Stream

Returns a new instance of Stream.



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# File 'lib/liquid_stream/stream.rb', line 6

def initialize(source=nil, stream_context={})
  @source = source
  @stream_context = stream_context
end

Instance Attribute Details

#source ⇒ Object (readonly)

Returns the value of attribute source.



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# File 'lib/liquid_stream/stream.rb', line 4

def source
  @source
end

#stream_context ⇒ Object (readonly)

Returns the value of attribute stream_context.



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# File 'lib/liquid_stream/stream.rb', line 4

def stream_context
  @stream_context
end

Class Method Details

.stream(method_name, options = {}, &block) ⇒ Object 



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# File 'lib/liquid_stream/stream.rb', line 13

def self.stream(method_name, options={}, &block)
  self.liquid_streams ||= {}
  self.liquid_streams[method_name] = {options: options, block: block}

  # DefinesStreamMethod
  if block_given?
    if options.has_key?(:matching)
      self.define_method_with_block method_name, block
    else
      self.delegate_method_with_block_to_new_stream_instance method_name, block
    end
  else
    self.send(:define_method, method_name) do |*args|
      method_result = source.send(method_name)
      options = self.class.liquid_streams[method_name][:options]

      if method_result.respond_to?(:each)
        # BuildsStreamClassName
        streams_class_name = Utils.
          streams_class_name_from(options[:as] || method_name)

        # FailsIfStreamNotDefined
        unless Object.const_defined?(streams_class_name)
          fail StreamNotDefined, "`#{streams_class_name}` is not defined"
        end

        # BuildsStreamClass
        streams_class = streams_class_name.constantize

        # CreatesStreams
        streams_class.new(method_result, stream_context)
      else
        stream_class_name = Utils.
          stream_class_name_from(options[:as] || method_name)

        if Object.const_defined?(stream_class_name)
          stream_class = stream_class_name.constantize
          stream_class.new(method_result, stream_context)
        else
          method_result
        end
      end
    end
  end
end

Instance Method Details

#before_method(method_name) ⇒ Object 



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# File 'lib/liquid_stream/stream.rb', line 59

def before_method(method_name)
  stream_name = matching_stream_names_for(method_name).first
  if stream_name
    options = self.liquid_streams[stream_name][:options]
    result = send(stream_name, method_name)

    if options[:as]
      if result.respond_to?(:each)
        # TODO: implement this IF we need to
        # streams_class_name = Util.stream_class_name_from(options[:as])
        # streams_class = streams_class_name.constantize
      else
        stream_class_name = Utils.stream_class_name_from(options[:as])
        stream_class = stream_class_name.constantize
        stream_class.new(result, stream_context)
      end
    else
      result
    end
  end
end