Class: Bmg::Reader::Csv

Inherits:
Object
  • Object
show all
Includes:
Bmg::Reader
Defined in:
lib/bmg/reader/csv.rb

Constant Summary collapse

DEFAULT_OPTIONS = 
{
  :headers => true,
  :return_headers => false,
  :smart => true
}

Instance Attribute Summary

Attributes included from Bmg::Reader

#type

Instance Method Summary collapse

Methods included from Bmg::Relation

#_count, #bind, #count, #debug, #delete, empty, #empty?, #insert, new, #one, #one_or_nil, #to_csv, #to_json, #to_xlsx, #type, #update, #visit, #with_type, #with_type_attrlist, #with_typecheck, #without_typecheck, #y_by_x, #ys_by_x

Methods included from Algebra

#allbut, #autosummarize, #autowrap, #constants, #extend, #group, #image, #join, #left_join, #matching, #materialize, #not_matching, #page, #project, #rename, #restrict, #spied, #summarize, #transform, #union, #unspied

Methods included from Algebra::Shortcuts

#exclude, #image, #images, #join, #left_join, #matching, #not_matching, #prefix, #rxmatch, #suffix, #where

Constructor Details

#initialize(type, path_or_io, options = {}) ⇒ Csv

Returns a new instance of Csv.



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# File 'lib/bmg/reader/csv.rb', line 12

def initialize(type, path_or_io, options = {})
  @type = type
  @path_or_io = path_or_io
  @options = DEFAULT_OPTIONS.merge(options)
  if @options[:smart] && !@path_or_io.is_a?(IO)
    @options[:col_sep] ||= infer_col_sep
    @options[:quote_char] ||= infer_quote_char
  end
end

Instance Method Details

#each ⇒ Object 



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# File 'lib/bmg/reader/csv.rb', line 22

def each
  return to_enum unless block_given?
  require 'csv'
  with_io do |io|
    ::CSV.new(io, csv_options).each do |row|
      yield tuple(row)
    end
  end
end

#to_ast ⇒ Object 



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# File 'lib/bmg/reader/csv.rb', line 32

def to_ast
  [ :csv, @path_or_io, @options ]
end

#to_s ⇒ Object Also known as: inspect 



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# File 'lib/bmg/reader/csv.rb', line 36

def to_s
  "(csv #{@path_or_io})"
end