Class: Scrapes::RuleParser::Rule

Inherits:
Object
  • Object
show all
Defined in:
lib/scrapes/rule_parser.rb

Overview

:nodoc:all

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, selector, extractor, limit) ⇒ Rule

Returns a new instance of Rule.



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# File 'lib/scrapes/rule_parser.rb', line 230

def initialize(name, selector, extractor, limit)
  @name, @selector, @extractor, @limit = name.to_s.intern, selector, extractor, limit
end

Instance Attribute Details

#extractor ⇒ Object (readonly)

Returns the value of attribute extractor.



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# File 'lib/scrapes/rule_parser.rb', line 227

def extractor
  @extractor
end

#limit ⇒ Object

Returns the value of attribute limit.



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# File 'lib/scrapes/rule_parser.rb', line 225

def limit
  @limit
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/scrapes/rule_parser.rb', line 224

def name
  @name
end

#selector ⇒ Object (readonly)

Returns the value of attribute selector.



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# File 'lib/scrapes/rule_parser.rb', line 226

def selector
  @selector
end

Instance Method Details

#inspect ⇒ Object 



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# File 'lib/scrapes/rule_parser.rb', line 257

def inspect
  @selector ? "[to #{@name} from #{@selector.inspect}, #{@extractor.inspect}, limit #{@limit}]" : "[to #{@name} from #{@extractor.inspect}, limit #{@limit}]"
end

#process(node, context) ⇒ Object 



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# File 'lib/scrapes/rule_parser.rb', line 235

def process(node, context)
  context.instance_variable_set '@hpricot', node
  return true if @limit == 0
  result = @selector.call(node)
  result = [result] unless result.respond_to? :each
  current = context.instance_variable_set "@#@name", []
  result.compact.each do |node|
    value = case @extractor
    when UnboundMethod then @extractor.bind(context).call(node)
    when Extractor     then @extractor.extract(node)
    when Proc, Method  then @extractor.call(node)
    when Class         then @extractor.parse(node)
    end
    next unless value
    current << value
    break if current.size == @limit
  end
  context.instance_variable_set "@#@name", current[0] if @limit == 1
  true
end