Class: Importer::CsvReader

Inherits:
DataReader show all
Defined in:
lib/iron/import/csv_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) ⇒ CsvReader

Returns a new instance of CsvReader.



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# File 'lib/iron/import/csv_reader.rb', line 7

def initialize(importer)
  super(importer, :csv)
  supports_file!
  supports_stream!
end

Instance Method Details

#init_source(mode, source) ⇒ Object 



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# File 'lib/iron/import/csv_reader.rb', line 13

def init_source(mode, source)
  if mode == :stream
    # For streams, we just read 'em in and parse 'em
    text = source.read
    
  elsif mode == :file
    # Files have a different path
    text = File.read(source)
    
  else
    # WTF?
    @importer.add_error("Unsupported CSV mode: #{mode.inspect}")
    return false
  end

  # Fix shitty Windows line-feeds so things are standardized
  text.gsub!(/\r\n/, "\n")
  text.gsub!(/\r/, "\n")

  # Look at first line, count sep chars, pick the most common
  sep_char = ','
  line = text.split(/\n/, 2).first
  if line.count("\t") > line.count(',')
    sep_char = "\t"
  end

  # Parse it out
  encoding = @importer.encoding || 'UTF-8'
  options = {
    :encoding => "#{encoding}:UTF-8",
    :skip_blanks => true,
    :col_sep => sep_char
  }
  begin
    @raw_rows = CSV.parse(text, options)
  rescue Exception => e
    @importer.add_error('Error encountered while parsing CSV')
    @importer.add_exception(e)
    return false
  end

  if @raw_rows.nil? || @raw_rows.count == 0
    @importer.add_error('No rows found - unable to process CSV file')
    return false
  else
    return true
  end
end

#load_raw(scopes, &block) ⇒ Object 



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# File 'lib/iron/import/csv_reader.rb', line 62

def load_raw(scopes, &block)
  # Normally, we'd check the scopes and return the proper data, but for CSV files, 
  # there's only one scope...
  block.call(@raw_rows)
end