# CSV -- module for generating/parsing CSV data.

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# Copyright (C) 2000-2004 NAKAMURA, Hiroshi <nakahiro@sarion.co.jp>.

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# $Id: csv.rb 11708 2007-02-12 23:01:19Z shyouhei $

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# This program is copyrighted free software by NAKAMURA, Hiroshi. You can

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# redistribute it and/or modify it under the same terms of Ruby's license;

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# either the dual license version in 2003, or any later version.

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class CSV

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class IllegalFormatError < RuntimeError; end

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# deprecated

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class Cell < String

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def initialize(data = "", is_null = false)

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super(is_null ? "" : data)

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end

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def data

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to_s

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end

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end

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# deprecated

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class Row < Array

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end

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# Open a CSV formatted file for reading or writing.

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#

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# For reading.

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#

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# EXAMPLE 1

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# CSV.open('csvfile.csv', 'r') do |row|

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# p row

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# end

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#

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# EXAMPLE 2

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# reader = CSV.open('csvfile.csv', 'r')

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# row1 = reader.shift

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# row2 = reader.shift

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# if row2.empty?

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# p 'row2 not find.'

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# end

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# reader.close

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#

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# ARGS

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# filename: filename to parse.

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# col_sep: Column separator. ?, by default. If you want to separate

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# fields with semicolon, give ?; here.

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# row_sep: Row separator. nil by default. nil means "\r\n or \n". If you

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# want to separate records with \r, give ?\r here.

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#

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# RETURNS

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# reader instance. To get parse result, see CSV::Reader#each.

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#

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#

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# For writing.

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#

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# EXAMPLE 1

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# CSV.open('csvfile.csv', 'w') do |writer|

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# writer << ['r1c1', 'r1c2']

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# writer << ['r2c1', 'r2c2']

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# writer << [nil, nil]

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# end

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#

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# EXAMPLE 2

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# writer = CSV.open('csvfile.csv', 'w')

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# writer << ['r1c1', 'r1c2'] << ['r2c1', 'r2c2'] << [nil, nil]

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# writer.close

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#

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# ARGS

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# filename: filename to generate.

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# col_sep: Column separator. ?, by default. If you want to separate

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# fields with semicolon, give ?; here.

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# row_sep: Row separator. nil by default. nil means "\r\n or \n". If you

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# want to separate records with \r, give ?\r here.

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#

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# RETURNS

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# writer instance. See CSV::Writer#<< and CSV::Writer#add_row to know how

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# to generate CSV string.

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#

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def CSV.open(path, mode, fs = nil, rs = nil, &block)

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if mode == 'r' or mode == 'rb'

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open_reader(path, mode, fs, rs, &block)

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elsif mode == 'w' or mode == 'wb'

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open_writer(path, mode, fs, rs, &block)

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else

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raise ArgumentError.new("'mode' must be 'r', 'rb', 'w', or 'wb'")

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end

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end

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def CSV.foreach(path, rs = nil, &block)

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open_reader(path, 'r', ',', rs, &block)

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end

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def CSV.read(path, length = nil, offset = nil)

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CSV.parse(IO.read(path, length, offset))

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end

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def CSV.readlines(path, rs = nil)

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reader = open_reader(path, 'r', ',', rs)

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begin

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reader.collect { |row| row }

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ensure

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reader.close

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end

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end

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def CSV.generate(path, fs = nil, rs = nil, &block)

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open_writer(path, 'w', fs, rs, &block)

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end

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# Parse lines from given string or stream. Return rows as an Array of Arrays.

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def CSV.parse(str_or_readable, fs = nil, rs = nil, &block)

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if File.exist?(str_or_readable)

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STDERR.puts("CSV.parse(filename) is deprecated." +

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" Use CSV.open(filename, 'r') instead.")

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return open_reader(str_or_readable, 'r', fs, rs, &block)

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end

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if block

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CSV::Reader.parse(str_or_readable, fs, rs) do |row|

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yield(row)

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end

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nil

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else

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CSV::Reader.create(str_or_readable, fs, rs).collect { |row| row }

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end

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end

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# Parse a line from given string. Bear in mind it parses ONE LINE. Rest of

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# the string is ignored for example "a,b\r\nc,d" => ['a', 'b'] and the

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# second line 'c,d' is ignored.

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#

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# If you don't know whether a target string to parse is exactly 1 line or

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# not, use CSV.parse_row instead of this method.

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def CSV.parse_line(src, fs = nil, rs = nil)

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fs ||= ','

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if fs.is_a?(Fixnum)

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fs = fs.chr

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end

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if !rs.nil? and rs.is_a?(Fixnum)

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rs = rs.chr

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end

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idx = 0

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res_type = :DT_COLSEP

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row = []

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begin

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while res_type == :DT_COLSEP

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res_type, idx, cell = parse_body(src, idx, fs, rs)

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row << cell

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end

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rescue IllegalFormatError

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return []

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end

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row

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end

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# Create a line from cells. each cell is stringified by to_s.

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def CSV.generate_line(row, fs = nil, rs = nil)

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if row.size == 0

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return ''

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end

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fs ||= ','

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if fs.is_a?(Fixnum)

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fs = fs.chr

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end

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if !rs.nil? and rs.is_a?(Fixnum)

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rs = rs.chr

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end

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res_type = :DT_COLSEP

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result_str = ''

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idx = 0

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while true

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generate_body(row[idx], result_str, fs, rs)

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idx += 1

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if (idx == row.size)

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break

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end

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generate_separator(:DT_COLSEP, result_str, fs, rs)

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end

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result_str

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end

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# Parse a line from string. Consider using CSV.parse_line instead.

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# To parse lines in CSV string, see EXAMPLE below.

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#

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# EXAMPLE

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# src = "a,b\r\nc,d\r\ne,f"

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# idx = 0

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# begin

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# parsed = []

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# parsed_cells, idx = CSV.parse_row(src, idx, parsed)

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# puts "Parsed #{ parsed_cells } cells."

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# p parsed

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# end while parsed_cells > 0

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#

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# ARGS

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# src: a CSV data to be parsed. Must respond '[](idx)'.

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# src[](idx) must return a char. (Not a string such as 'a', but 97).

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# src[](idx_out_of_bounds) must return nil. A String satisfies this

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# requirement.

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# idx: index of parsing location of 'src'. 0 origin.

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# out_dev: buffer for parsed cells. Must respond '<<(aString)'.

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# col_sep: Column separator. ?, by default. If you want to separate

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# fields with semicolon, give ?; here.

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# row_sep: Row separator. nil by default. nil means "\r\n or \n". If you

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# want to separate records with \r, give ?\r here.

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#

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# RETURNS

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# parsed_cells: num of parsed cells.

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# idx: index of next parsing location of 'src'.

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#

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def CSV.parse_row(src, idx, out_dev, fs = nil, rs = nil)

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fs ||= ','

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if fs.is_a?(Fixnum)

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fs = fs.chr

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end

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if !rs.nil? and rs.is_a?(Fixnum)

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rs = rs.chr

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end

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idx_backup = idx

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parsed_cells = 0

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res_type = :DT_COLSEP

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begin

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while res_type != :DT_ROWSEP

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res_type, idx, cell = parse_body(src, idx, fs, rs)

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if res_type == :DT_EOS

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if idx == idx_backup #((parsed_cells == 0) and cell.nil?)

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return 0, 0

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end

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res_type = :DT_ROWSEP

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end

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parsed_cells += 1

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out_dev << cell

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end

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rescue IllegalFormatError

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return 0, 0

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end

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return parsed_cells, idx

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end

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# Convert a line from cells data to string. Consider using CSV.generate_line

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# instead. To generate multi-row CSV string, see EXAMPLE below.

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#

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# EXAMPLE

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# row1 = ['a', 'b']

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# row2 = ['c', 'd']

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# row3 = ['e', 'f']

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# src = [row1, row2, row3]

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# buf = ''

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# src.each do |row|

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# parsed_cells = CSV.generate_row(row, 2, buf)

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# puts "Created #{ parsed_cells } cells."

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# end

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# p buf

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#

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# ARGS

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# src: an Array of String to be converted to CSV string. Must respond to

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# 'size' and '[](idx)'. src[idx] must return String.

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# cells: num of cells in a line.

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# out_dev: buffer for generated CSV string. Must respond to '<<(string)'.

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# col_sep: Column separator. ?, by default. If you want to separate

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# fields with semicolon, give ?; here.

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# row_sep: Row separator. nil by default. nil means "\r\n or \n". If you

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# want to separate records with \r, give ?\r here.

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#

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# RETURNS

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# parsed_cells: num of converted cells.

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#

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def CSV.generate_row(src, cells, out_dev, fs = nil, rs = nil)

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fs ||= ','

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if fs.is_a?(Fixnum)

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fs = fs.chr

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end

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if !rs.nil? and rs.is_a?(Fixnum)

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rs = rs.chr

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end

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src_size = src.size

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if (src_size == 0)

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if cells == 0

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generate_separator(:DT_ROWSEP, out_dev, fs, rs)

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end

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return 0

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end

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res_type = :DT_COLSEP

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parsed_cells = 0

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generate_body(src[parsed_cells], out_dev, fs, rs)

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parsed_cells += 1

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while ((parsed_cells < cells) and (parsed_cells != src_size))

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generate_separator(:DT_COLSEP, out_dev, fs, rs)

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generate_body(src[parsed_cells], out_dev, fs, rs)

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parsed_cells += 1

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end

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if (parsed_cells == cells)

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generate_separator(:DT_ROWSEP, out_dev, fs, rs)

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else

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generate_separator(:DT_COLSEP, out_dev, fs, rs)

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end

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parsed_cells

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end

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# Private class methods.

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class << self

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private

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def open_reader(path, mode, fs, rs, &block)

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file = File.open(path, mode)

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if block

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begin

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CSV::Reader.parse(file, fs, rs) do |row|

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yield(row)

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end

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ensure

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file.close

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end

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nil

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else

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reader = CSV::Reader.create(file, fs, rs)

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reader.close_on_terminate

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reader

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end

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end

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def open_writer(path, mode, fs, rs, &block)

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file = File.open(path, mode)

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if block

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begin

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CSV::Writer.generate(file, fs, rs) do |writer|

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yield(writer)

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end

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ensure

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file.close

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end

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nil

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else

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writer = CSV::Writer.create(file, fs, rs)

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writer.close_on_terminate

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writer

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end

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end

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def parse_body(src, idx, fs, rs)

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fs_str = fs

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fs_size = fs_str.size

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rs_str = rs || "\n"

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rs_size = rs_str.size

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fs_idx = rs_idx = 0

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cell = Cell.new

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state = :ST_START

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quoted = cr = false

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c = nil

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last_idx = idx

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while c = src[idx]

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unless quoted

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fschar = (c == fs_str[fs_idx])

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rschar = (c == rs_str[rs_idx])

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# simple 1 char backtrack

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if !fschar and c == fs_str[0]

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fs_idx = 0

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fschar = true

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if state == :ST_START

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state = :ST_DATA

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elsif state == :ST_QUOTE

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raise IllegalFormatError

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end

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end

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if !rschar and c == rs_str[0]

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rs_idx = 0

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rschar = true

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if state == :ST_START

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state = :ST_DATA

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elsif state == :ST_QUOTE

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raise IllegalFormatError

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end

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end

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end

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if c == ?"

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fs_idx = rs_idx = 0

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if cr

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raise IllegalFormatError

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end

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cell << src[last_idx, (idx - last_idx)]

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last_idx = idx

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if state == :ST_DATA

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if quoted

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last_idx += 1

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quoted = false

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state = :ST_QUOTE

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else

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raise IllegalFormatError

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end

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elsif state == :ST_QUOTE

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cell << c.chr

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last_idx += 1

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quoted = true

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state = :ST_DATA

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else # :ST_START

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quoted = true

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last_idx += 1

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state = :ST_DATA

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end

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elsif fschar or rschar

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if fschar

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fs_idx += 1

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end

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if rschar

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rs_idx += 1

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end

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sep = nil

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if fs_idx == fs_size

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if state == :ST_START and rs_idx > 0 and fs_idx < rs_idx

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state = :ST_DATA

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end

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cell << src[last_idx, (idx - last_idx - (fs_size - 1))]

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last_idx = idx

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fs_idx = rs_idx = 0

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if cr

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raise IllegalFormatError

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end

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sep = :DT_COLSEP

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elsif rs_idx == rs_size

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if state == :ST_START and fs_idx > 0 and rs_idx < fs_idx

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state = :ST_DATA

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end

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if !(rs.nil? and cr)

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cell << src[last_idx, (idx - last_idx - (rs_size - 1))]

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last_idx = idx

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end

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fs_idx = rs_idx = 0

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sep = :DT_ROWSEP

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end

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if sep

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if state == :ST_DATA

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return sep, idx + 1, cell;

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elsif state == :ST_QUOTE

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return sep, idx + 1, cell;

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else # :ST_START

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return sep, idx + 1, nil

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end

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end

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elsif rs.nil? and c == ?\r

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# special \r treatment for backward compatibility

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fs_idx = rs_idx = 0

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if cr

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raise IllegalFormatError

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end

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cell << src[last_idx, (idx - last_idx)]

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last_idx = idx

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if quoted

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state = :ST_DATA

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else

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cr = true

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end

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else

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fs_idx = rs_idx = 0

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if state == :ST_DATA or state == :ST_START

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if cr

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raise IllegalFormatError

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end

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state = :ST_DATA

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else # :ST_QUOTE

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raise IllegalFormatError

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end

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end

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idx += 1

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end

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if state == :ST_START

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if fs_idx > 0 or rs_idx > 0

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state = :ST_DATA

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else

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return :DT_EOS, idx, nil

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end

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elsif quoted

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raise IllegalFormatError

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elsif cr

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raise IllegalFormatError

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end

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cell << src[last_idx, (idx - last_idx)]

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last_idx = idx

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return :DT_EOS, idx, cell

[480] Fix | Delete

end

[481] Fix | Delete

[482] Fix | Delete

def generate_body(cell, out_dev, fs, rs)

[483] Fix | Delete

if cell.nil?

[484] Fix | Delete

# empty

[485] Fix | Delete

else

[486] Fix | Delete

cell = cell.to_s

[487] Fix | Delete

row_data = cell.dup

[488] Fix | Delete

if (row_data.gsub!('"', '""') or

[489] Fix | Delete

row_data.index(fs) or

[490] Fix | Delete

(rs and row_data.index(rs)) or

[491] Fix | Delete

(/[\r\n]/ =~ row_data) or

[492] Fix | Delete

(cell.empty?))

[493] Fix | Delete

out_dev << '"' << row_data << '"'

[494] Fix | Delete

else

[495] Fix | Delete

out_dev << row_data

[496] Fix | Delete

end

[497] Fix | Delete

end

[498] Fix | Delete

end

[499] Fix | Delete