Class: Rcsv

Inherits:
Object
  • Object
show all
Defined in:
lib/data_kit/patches/rcsv.rb

Overview

This is a temporary monkey patch to Rcsv.parse

to silence warnings in Ruby 2 about #lines being deprecated

Class Method Summary collapse

Class Method Details

.parse(csv_data, options = {}, &block) ⇒ Object 



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# File 'lib/data_kit/patches/rcsv.rb', line 12

def self.parse(csv_data, options = {}, &block)
  options[:header] ||= :use
  raw_options = {}

  raw_options[:col_sep] = options[:column_separator] && options[:column_separator][0] || ','
  raw_options[:offset_rows] = options[:offset_rows] || 0
  raw_options[:nostrict] = options[:nostrict]
  raw_options[:parse_empty_fields_as] = options[:parse_empty_fields_as]
  raw_options[:buffer_size] = options[:buffer_size] || 1024 * 1024 # 1 MiB

  if csv_data.is_a?(String)
    csv_data = StringIO.new(csv_data)
  elsif !(csv_data.respond_to?(:lines) && csv_data.respond_to?(:read))
    inspected_csv_data = csv_data.inspect
    raise ParseError.new("Supplied CSV object #{inspected_csv_data[0..127]}#{inspected_csv_data.size > 128 ? '...' : ''} is neither String nor looks like IO object.")
  end

  if csv_data.respond_to?(:external_encoding)
    raw_options[:output_encoding] = csv_data.external_encoding.to_s
  end

  initial_position = csv_data.pos

  first_line = csv_data.each_line.first
  field_count = first_line.split(raw_options[:col_sep]).length

  case options[:header]
  when :use
    header = self.raw_parse(StringIO.new(first_line), raw_options).first
    raw_options[:offset_rows] += 1
  when :skip
    header = (0..field_count).to_a
    raw_options[:offset_rows] += 1
  when :none
    header = (0..field_count).to_a
  end

  raw_options[:row_as_hash] = options[:row_as_hash] # Setting after header parsing

  if options[:columns]
    only_rows = []
    except_rows = []
    row_defaults = []
    column_names = []
    row_conversions = ''

    header.each do |column_header|
      column_options = options[:columns][column_header]
      if column_options
        if (options[:row_as_hash])
          column_names << (column_options[:alias] || column_header)
        end

        row_defaults << column_options[:default] || nil

        only_rows << case column_options[:match]
        when Array
          column_options[:match]
        when nil
          nil
        else
          [column_options[:match]]
        end

        except_rows << case column_options[:not_match]
        when Array
          column_options[:not_match]
        when nil
          nil
        else
          [column_options[:not_match]]
        end

        row_conversions << case column_options[:type]
        when :int
          'i'
        when :float
          'f'
        when :string
          's'
        when :bool
          'b'
        when nil
          's' # strings by default
        else
          fail "Unknown column type #{column_options[:type].inspect}."
        end
      elsif options[:only_listed_columns]
        column_names << nil
        row_defaults << nil
        only_rows << nil
        except_rows << nil
        row_conversions << ' '
      else
        column_names << column_header
        row_defaults << nil
        only_rows << nil
        except_rows << nil
        row_conversions << 's'
      end
    end

    raw_options[:column_names] = column_names if options[:row_as_hash]
    raw_options[:only_rows] = only_rows unless only_rows.compact.empty?
    raw_options[:except_rows] = except_rows unless except_rows.compact.empty?
    raw_options[:row_defaults] = row_defaults unless row_defaults.compact.empty?
    raw_options[:row_conversions] = row_conversions
  end

  csv_data.pos = initial_position
  return self.raw_parse(csv_data, raw_options, &block)
end