class IOStreams::Row::Reader

Converts each line of an input stream into an array for every line

Public Class Methods

file(file_name, original_file_name: file_name, delimiter: $/, **args) { |new(io, original_file_name: original_file_name, **args)| ... } click to toggle source

When reading from a file also add the line reader stream

# File lib/io_streams/row/reader.rb, line 16
def self.file(file_name, original_file_name: file_name, delimiter: $/, **args)
  IOStreams::Line::Reader.file(file_name, original_file_name: original_file_name, delimiter: delimiter) do |io|
    yield new(io, original_file_name: original_file_name, **args)
  end
end
new(line_reader, cleanse_header: true, original_file_name: nil, **args) click to toggle source

Create a Tabular reader to return the stream rows as arrays.

Parameters

delimited: [#each]
  Anything that returns one line / record at a time when #each is called on it.

format: [Symbol]
  :csv, :hash, :array, :json, :psv, :fixed

For all other parameters, see Tabular::Header.new
# File lib/io_streams/row/reader.rb, line 32
def initialize(line_reader, cleanse_header: true, original_file_name: nil, **args)
  unless line_reader.respond_to?(:each)
    raise(ArgumentError, "Stream must be a IOStreams::Line::Reader or implement #each")
  end

  @tabular        = IOStreams::Tabular.new(file_name: original_file_name, **args)
  @line_reader    = line_reader
  @cleanse_header = cleanse_header
end
stream(line_reader, **args) { |line_reader| ... } click to toggle source

Read a line as an Array at a time from a stream. Note:

  • The supplied stream must already be a line stream, or a stream that responds to :each

# File lib/io_streams/row/reader.rb, line 8
def self.stream(line_reader, **args)
  # Pass-through if already a row reader
  return yield(line_reader) if line_reader.is_a?(self.class)

  yield new(line_reader, **args)
end

Public Instance Methods

each() { |columns| ... } click to toggle source
# File lib/io_streams/row/reader.rb, line 42
def each
  @line_reader.each do |line|
    if @tabular.header?
      columns = @tabular.parse_header(line)
      @tabular.cleanse_header! if @cleanse_header
      yield columns
    else
      yield @tabular.row_parse(line)
    end
  end
end