Module: MARC::NokogiriReader

Includes:
GenericPullParser
Defined in:
lib/marc/xml_parsers.rb

Overview

NokogiriReader uses the Nokogiri SAX Parser to quickly read a MARCXML document. Because dynamically subclassing MARC::XMLReader is a little ugly, we need to recreate all of the SAX event methods from Nokogiri::XML::SAX::Document here rather than subclassing.

Class Method Summary collapse

Instance Method Summary collapse

Methods included from GenericPullParser

#characters, #end_element_namespace, #start_element_namespace, #yield_record

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(methName, *args) ⇒ Object 



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# File 'lib/marc/xml_parsers.rb', line 113

def method_missing(methName, *args)
  sax_methods = [:xmldecl, :start_document, :end_document, :start_element,
    :end_element, :comment, :warning, :error, :cdata_block]
  unless sax_methods.index(methName)
    raise NoMethodError.new("undefined method '#{methName} for #{self}", 'no_meth')
  end
end

Class Method Details

.extended(receiver) ⇒ Object 



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# File 'lib/marc/xml_parsers.rb', line 93

def self.extended(receiver)
  require 'nokogiri'
  receiver.init
end

Instance Method Details

#each(&block) ⇒ Object

Loop through the MARC records in the XML document



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# File 'lib/marc/xml_parsers.rb', line 107

def each(&block)    
  @block = block
  @parser.parse(@handle)
end

#init ⇒ Object

Sets our instance variables for SAX parsing in Nokogiri and parser



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# File 'lib/marc/xml_parsers.rb', line 99

def init
  @record = {:record=>nil,:field=>nil,:subfield=>nil}
  @current_element = nil
  @ns = "http://www.loc.gov/MARC21/slim"
  @parser = Nokogiri::XML::SAX::Parser.new(self)         
end