Class: Importer::HtmlReader

Inherits:
DataReader show all
Defined in:
lib/iron/import/html_reader.rb

Instance Attribute Summary

Attributes inherited from DataReader

#format

Instance Method Summary collapse

Methods inherited from DataReader

#add_error, #add_exception, for_format, for_path, for_source, for_stream, is_stream?, #load, #load_each, #parse_value, path_from_stream, #supports?, #supports_file!, #supports_file?, #supports_stream!, #supports_stream?, verify_nokogiri!, verify_roo!

Constructor Details

#initialize(importer) ⇒ HtmlReader

Returns a new instance of HtmlReader.



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# File 'lib/iron/import/html_reader.rb', line 5

def initialize(importer)
  super(importer, :html)
  supports_file!
  supports_stream!
  @tables = nil
end

Instance Method Details

#init_source(mode, source) ⇒ Object 



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# File 'lib/iron/import/html_reader.rb', line 12

def init_source(mode, source)
  if mode == :stream
    @html = Nokogiri::HTML(source)
  elsif mode == :file
    @html = File.open(source) {|f| Nokogiri::HTML(f) }
  else
    add_error("Unsupported HTML mode: #{mode}")
    return false
  end
  
  if @html
    true
  else
    add_error("Failed parsing of HTML")
    false
  end
  
rescue Exception => e
  add_exception(e)
  false
end

#load_raw(scopes, &block) ⇒ Object 



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# File 'lib/iron/import/html_reader.rb', line 34

def load_raw(scopes, &block)
  # Default to searching all tables in the document
  if scopes.nil? || scopes.empty?
    scopes = ['table']
  end
  
  # Catch here lets us break out of the nested loop cleanly
  catch(:found) do
    # Run each scope, which should be a valid css selector
    scopes.each do |scope|
      @html.css(scope).each do |table_node|
        rows = []
        table_node.css('tr').each do |row_node|
          row = []
          row_node.children.each do |cell_node|
            if ['th', 'td'].include?(cell_node.name)
              row << cell_node.text.strip
              # Handle col-span values appropriately
              span_count = cell_node.attr('colspan')
              (span_count.to_i - 1).times do 
                row << nil
              end
            end
          end
          rows << row
        end
        found = block.call(rows)
        throw(:found, true) if found
      end
    end
  end

rescue Exception => e
  # Not sure why we'd get here, but we strive for error-freedom here, yessir.
  add_exception(e)
end