Class: Yarss::Rdf::FeedParser

Inherits:
Object
  • Object
show all
Defined in:
lib/yarss/rdf/feed_parser.rb

Overview

Extract title, link, description and items from a parsed Rdf feed.

See Also:

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(data) ⇒ FeedParser

Returns a new instance of FeedParser.

Parameters:

  • data (Hash) —

    Parsed Rdf feed.



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# File 'lib/yarss/rdf/feed_parser.rb', line 18

def initialize(data)
  self.data = data
end

Instance Attribute Details

#data ⇒ Hash

Parsed Rdf feed.

Returns:

  • (Hash) 


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# File 'lib/yarss/rdf/feed_parser.rb', line 15

def data
  @data
end

Instance Method Details

#channel ⇒ Hash

Extract the channel data.

Returns:

  • (Hash)

Raises:



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# File 'lib/yarss/rdf/feed_parser.rb', line 59

def channel
  @channel ||= feed.fetch('channel')
rescue KeyError => e
  raise ParseError, e
end

#description ⇒ String

Extract the description.

Returns:

  • (String) 


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# File 'lib/yarss/rdf/feed_parser.rb', line 90

def description
  Attribute.value(channel.fetch('description'))
rescue KeyError => e
  raise ParseError, e
end

#feed ⇒ Hash

Extract the feed data.

Returns:

  • (Hash)

Raises:



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# File 'lib/yarss/rdf/feed_parser.rb', line 42

def feed
  @feed ||= begin
    if data['RDF']
      data['RDF']
    else
      data.fetch('rdf:RDF')
    end
  end
rescue KeyError => e
  raise ParseError, e
end

#items ⇒ Array<Item>

Extract and parse the items.

Returns:

Raises:



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# File 'lib/yarss/rdf/feed_parser.rb', line 101

def items
  items = feed.fetch('item')
  items = [items] unless items.is_a?(Array)
  items.map { |d| ItemParser.new(d).parse }
rescue KeyError => e
  raise ParseError, e
end

#link ⇒ String

Extract the link.

Returns:

  • (String)

Raises:



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# File 'lib/yarss/rdf/feed_parser.rb', line 81

def link
  Attribute.link_value(channel.fetch('link'))
rescue KeyError => e
  raise ParseError, e
end

#parse ⇒ Feed

Parse out the feed title, link, description and items and wrap them in a data object.

Returns:

Raises:

  • (ParseError) —

    If a required field is not found.



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# File 'lib/yarss/rdf/feed_parser.rb', line 28

def parse
  Feed.new(
    title:       title,
    link:        link,
    description: description,
    items:       items
  )
end

#title ⇒ String

Extract the title.

Returns:

  • (String)

Raises:



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# File 'lib/yarss/rdf/feed_parser.rb', line 70

def title
  Attribute.value(channel.fetch('title'))
rescue KeyError => e
  raise ParseError, e
end