Class: Planet::Parsers

Inherits:
Object
  • Object
show all
Defined in:
lib/planet/parsers.rb,
lib/planet/parsers/base_parser.rb

Overview

Parsers class - manager for the feed parsers

parser classes inherit from Planet::Parsers::BaseParser and are added automatically to the list of available parsers. files located on planet/parsers are automatically loaded.

Defined Under Namespace

Classes: BaseParser

Constant Summary collapse

@@parsers = 
Set.new

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Parsers

Parser instances keep indexes of the available parsers and check for duplicate definitions (need to use an instance because #inherited gets called as soon as the class is seen but before it is fully defined).



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# File 'lib/planet/parsers.rb', line 21

def initialize
  @types, @domains = {}, {}

  @@parsers.each do |parser|
    new_type, new_domains = parser.type, parser.domains

    fail("duplicate type") if new_type and @types.has_key? new_type
    fail("overlapping domains") unless (@domains.keys & new_domains).empty?

    @types[new_type] = parser if new_type
    new_domains.each do |new_domain|
      @domains[new_domain] = parser
    end
  end
end

Class Method Details

.add_parser(parser) ⇒ Object 



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# File 'lib/planet/parsers.rb', line 13

def self.add_parser(parser)
  @@parsers << parser
end

Instance Method Details

#get_parser(type) ⇒ Object

returns the appropiate parser based on the type



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# File 'lib/planet/parsers.rb', line 38

def get_parser(type)
  begin
    return @types.fetch(type)
  rescue KeyError => e
    raise(ArgumentError, "No parser for type '#{ type }'", caller)
  end
end

#get_parser_for(feed) ⇒ Object

returns any parser that can handle this feeds’ domain, defaults to Feedjira if none available.



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# File 'lib/planet/parsers.rb', line 48

def get_parser_for(feed)
  feed_domain = URI(feed).host

  @domains.each do |domain, parser|
    return parser if feed_domain.end_with? domain
  end

  return Feedjira::Feed # default generic parser
end