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module Feedzirra
class NoParserAvailable < StandardError; end
# Determines the correct parser for an XML feed.
class FeedParser
attr_reader :xml, :parser
def initialize(xml)
@xml = xml
@parser = detect_feed_processor_for_xml(@xml)
end
def detect_feed_processor_for_xml(xml)
start_of_doc = xml.slice(0, 1000)
if_none_found = lambda do
raise NoParserAvailable.new("No valid parser for XML.")
end
feed_classes.detect(if_none_found) do |klass|
klass.able_to_parse?(start_of_doc)
end
end
# Determines the correct Parser for the XML document with which
# we were initialized and returns results of this parser on the
# document. Raises NoParserAvailable if no valid parser is
# found.
def run
@parser.parse(@xml)
end
# Adds a new feed parsing class that will be used for parsing.
#
# === Parameters
# [klass<Constant>] The class/constant that you want to register.
# === Returns
# A updated array of feed parser class names.
def add_feed_class(klass)
feed_classes.unshift klass
end
# Provides a list of registered feed parsing classes.
#
# === Returns
# A array of class names.
def feed_classes
@@feed_classes ||= [Feedzirra::Parser::RSS, Feedzirra::Parser::AtomFeedBurner, Feedzirra::Parser::Atom]
end
# Makes all entry types look for the passed in element to parse. This is actually just a call to
# element (a SAXMachine call) in the class
#
# === Parameters
# [element_tag<String>]
# [options<Hash>] Valid keys are same as with SAXMachine
def add_common_feed_entry_element(element_tag, options = {})
feed_classes.map{|k| eval("#{k}Entry") }.each do |klass|
klass.send(:element, element_tag, options)
end
end
end
end
Version data entries
11 entries across 11 versions & 1 rubygems