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
}

Instance Attribute Summary

Attributes included from Bmg::Reader

#type

Instance Method Summary collapse

Methods included from Bmg::Relation

#bind, #debug, #delete, empty, #empty?, #insert, new, #one, #one_or_nil, #to_csv, #to_json, #update, #visit, #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

#image, #join, #left_join, #matching, #not_matching, #prefix, #rxmatch, #suffix

Constructor Details

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

Returns a new instance of Csv.



11
12
13
14
15
16
17
 
# File 'lib/bmg/reader/csv.rb', line 11

def initialize(type, path, options = {})
  @type = type
  @path = path
  @options = DEFAULT_OPTIONS.merge(options)
  @options[:col_sep] ||= infer_col_sep
  @options[:quote_char] ||= infer_quote_char
end

Instance Method Details

#each ⇒ Object 



19
20
21
22
23
24
 
# File 'lib/bmg/reader/csv.rb', line 19

def each
  require 'csv'
  ::CSV.foreach(@path, @options) do |row|
    yield tuple(row)
  end
end

#to_ast ⇒ Object 



26
27
28
 
# File 'lib/bmg/reader/csv.rb', line 26

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

#to_s ⇒ Object Also known as: inspect 



30
31
32
 
# File 'lib/bmg/reader/csv.rb', line 30

def to_s
  "(csv #{path})"
end