Class: Yarss::Rdf::ItemParser

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

Overview

Extract id, title, updated, link and content from a feed item.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(data) ⇒ ItemParser

Returns a new instance of ItemParser.

Parameters:

  • data (Hash) —

    Parsed Rdf feed item.



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# File 'lib/yarss/rdf/item_parser.rb', line 13

def initialize(data)
  self.data = data
end

Instance Attribute Details

#data ⇒ Hash

Parsed Rdf feed item.

Returns:

  • (Hash) 


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# File 'lib/yarss/rdf/item_parser.rb', line 10

def data
  @data
end

Instance Method Details

#author ⇒ String

Extract the author.

Returns:

  • (String)

Raises:



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# File 'lib/yarss/rdf/item_parser.rb', line 92

def author
  author = if data['dc:creator']
             data['dc:creator']
           else
             data.fetch('creator')
           end

  Attribute.value(author)
rescue KeyError => e
  raise ParseError, e
end

#description ⇒ String

Extract the description.

Returns:

  • (String) 


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# File 'lib/yarss/rdf/item_parser.rb', line 107

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

#id ⇒ String

Extract the ID.

Returns:

  • (String)

Raises:



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# File 'lib/yarss/rdf/item_parser.rb', line 39

def id
  if data['about']
    data['about']
  else
    data.fetch('rdf:about')
  end
rescue KeyError => e
  raise ParseError, e
end

#link ⇒ String

Extract the link.

Returns:

  • (String)

Raises:



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

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

#parse ⇒ Item

Parse out the feed item id, title, updated, link and content 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/item_parser.rb', line 23

def parse
  Item.new(
    id:         id,
    title:      title,
    updated_at: updated,
    link:       link,
    author:     author,
    content:    description
  )
end

#title ⇒ String

Extract the title.

Returns:

  • (String)

Raises:



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# File 'lib/yarss/rdf/item_parser.rb', line 54

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

#updated ⇒ DateTime

Extract the updated date.

Returns:

  • (DateTime)

Raises:



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# File 'lib/yarss/rdf/item_parser.rb', line 65

def updated
  date = if data['date']
           data['date']
         else
           data.fetch('dc:date')
         end
  DateTime.parse(date)
rescue KeyError, ArgumentError => e
  raise ParseError, e
end