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Edit File : parser.rb \| Size : 31.33 KB
# frozen_string_literal: true require "strscan" require_relative "delete_suffix" require_relative "match_p" require_relative "row" require_relative "table" using CSV::DeleteSuffix if CSV.const_defined?(:DeleteSuffix) using CSV::MatchP if CSV.const_defined?(:MatchP) class CSV # Note: Don't use this class directly. This is an internal class. class Parser # # A CSV::Parser is m17n aware. The parser works in the Encoding of the IO # or String object being read from or written to. Your data is never transcoded # (unless you ask Ruby to transcode it for you) and will literally be parsed in # the Encoding it is in. Thus CSV will return Arrays or Rows of Strings in the # Encoding of your data. This is accomplished by transcoding the parser itself # into your Encoding. # # Raised when encoding is invalid. class InvalidEncoding < StandardError end # # CSV::Scanner receives a CSV output, scans it and return the content. # It also controls the life cycle of the object with its methods +keep_start+, # +keep_end+, +keep_back+, +keep_drop+. # # Uses StringScanner (the official strscan gem). Strscan provides lexical # scanning operations on a String. We inherit its object and take advantage # on the methods. For more information, please visit: # https://ruby-doc.org/stdlib-2.6.1/libdoc/strscan/rdoc/StringScanner.html # class Scanner < StringScanner alias_method :scan_all, :scan def initialize(args) super @keeps = [] end def each_line(row_separator) position = pos rest.each_line(row_separator) do \|line\| position += line.bytesize self.pos = position yield(line) end end def keep_start @keeps.push(pos) end def keep_end start = @keeps.pop string.byteslice(start, pos - start) end def keep_back self.pos = @keeps.pop end def keep_drop @keeps.pop end end # # CSV::InputsScanner receives IO inputs, encoding and the chunk_size. # It also controls the life cycle of the object with its methods +keep_start+, # +keep_end+, +keep_back+, +keep_drop+. # # CSV::InputsScanner.scan() tries to match with pattern at the current position. # If there's a match, the scanner advances the “scan pointer” and returns the matched string. # Otherwise, the scanner returns nil. # # CSV::InputsScanner.rest() returns the “rest” of the string (i.e. everything after the scan pointer). # If there is no more data (eos? = true), it returns "". # class InputsScanner def initialize(inputs, encoding, chunk_size: 8192) @inputs = inputs.dup @encoding = encoding @chunk_size = chunk_size @last_scanner = @inputs.empty? @keeps = [] read_chunk end def each_line(row_separator) buffer = nil input = @scanner.rest position = @scanner.pos offset = 0 n_row_separator_chars = row_separator.size while true input.each_line(row_separator) do \|line\| @scanner.pos += line.bytesize if buffer if n_row_separator_chars == 2 and buffer.end_with?(row_separator[0]) and line.start_with?(row_separator[1]) buffer << line[0] line = line[1..-1] position += buffer.bytesize + offset @scanner.pos = position offset = 0 yield(buffer) buffer = nil next if line.empty? else buffer << line line = buffer buffer = nil end end if line.end_with?(row_separator) position += line.bytesize + offset @scanner.pos = position offset = 0 yield(line) else buffer = line end end break unless read_chunk input = @scanner.rest position = @scanner.pos offset = -buffer.bytesize if buffer end yield(buffer) if buffer end def scan(pattern) value = @scanner.scan(pattern) return value if @last_scanner if value read_chunk if @scanner.eos? return value else nil end end def scan_all(pattern) value = @scanner.scan(pattern) return value if @last_scanner return nil if value.nil? while @scanner.eos? and read_chunk and (sub_value = @scanner.scan(pattern)) value << sub_value end value end def eos? @scanner.eos? end def keep_start @keeps.push([@scanner.pos, nil]) end def keep_end start, buffer = @keeps.pop keep = @scanner.string.byteslice(start, @scanner.pos - start) if buffer buffer << keep keep = buffer end keep end def keep_back start, buffer = @keeps.pop if buffer string = @scanner.string keep = string.byteslice(start, string.bytesize - start) if keep and not keep.empty? @inputs.unshift(StringIO.new(keep)) @last_scanner = false end @scanner = StringScanner.new(buffer) else @scanner.pos = start end read_chunk if @scanner.eos? end def keep_drop @keeps.pop end def rest @scanner.rest end private def read_chunk return false if @last_scanner unless @keeps.empty? keep = @keeps.last keep_start = keep[0] string = @scanner.string keep_data = string.byteslice(keep_start, @scanner.pos - keep_start) if keep_data keep_buffer = keep[1] if keep_buffer keep_buffer << keep_data else keep[1] = keep_data.dup end end keep[0] = 0 end input = @inputs.first case input when StringIO string = input.read raise InvalidEncoding unless string.valid_encoding? @scanner = StringScanner.new(string) @inputs.shift @last_scanner = @inputs.empty? true else chunk = input.gets(nil, @chunk_size) if chunk raise InvalidEncoding unless chunk.valid_encoding? @scanner = StringScanner.new(chunk) if input.respond_to?(:eof?) and input.eof? @inputs.shift @last_scanner = @inputs.empty? end true else @scanner = StringScanner.new("".encode(@encoding)) @inputs.shift @last_scanner = @inputs.empty? if @last_scanner false else read_chunk end end end end end def initialize(input, options) @input = input @options = options @samples = [] prepare end def column_separator @column_separator end def row_separator @row_separator end def quote_character @quote_character end def field_size_limit @field_size_limit end def skip_lines @skip_lines end def unconverted_fields? @unconverted_fields end def headers @headers end def header_row? @use_headers and @headers.nil? end def return_headers? @return_headers end def skip_blanks? @skip_blanks end def liberal_parsing? @liberal_parsing end def lineno @lineno end def line last_line end def parse(&block) return to_enum(__method__) unless block_given? if @return_headers and @headers and @raw_headers headers = Row.new(@headers, @raw_headers, true) if @unconverted_fields headers = add_unconverted_fields(headers, []) end yield headers end begin @scanner \|\|= build_scanner if quote_character.nil? parse_no_quote(&block) elsif @need_robust_parsing parse_quotable_robust(&block) else parse_quotable_loose(&block) end rescue InvalidEncoding if @scanner ignore_broken_line lineno = @lineno else lineno = @lineno + 1 end message = "Invalid byte sequence in #{@encoding}" raise MalformedCSVError.new(message, lineno) end end def use_headers? @use_headers end private # A set of tasks to prepare the file in order to parse it def prepare prepare_variable prepare_quote_character prepare_backslash prepare_skip_lines prepare_strip prepare_separators prepare_quoted prepare_unquoted prepare_line prepare_header prepare_parser end def prepare_variable @need_robust_parsing = false @encoding = @options[:encoding] liberal_parsing = @options[:liberal_parsing] if liberal_parsing @liberal_parsing = true if liberal_parsing.is_a?(Hash) @double_quote_outside_quote = liberal_parsing[:double_quote_outside_quote] @backslash_quote = liberal_parsing[:backslash_quote] else @double_quote_outside_quote = false @backslash_quote = false end @need_robust_parsing = true else @liberal_parsing = false @backslash_quote = false end @unconverted_fields = @options[:unconverted_fields] @field_size_limit = @options[:field_size_limit] @skip_blanks = @options[:skip_blanks] @fields_converter = @options[:fields_converter] @header_fields_converter = @options[:header_fields_converter] end def prepare_quote_character @quote_character = @options[:quote_character] if @quote_character.nil? @escaped_quote_character = nil @escaped_quote = nil else @quote_character = @quote_character.to_s.encode(@encoding) if @quote_character.length != 1 message = ":quote_char has to be nil or a single character String" raise ArgumentError, message end @double_quote_character = @quote_character 2 @escaped_quote_character = Regexp.escape(@quote_character) @escaped_quote = Regexp.new(@escaped_quote_character) end end def prepare_backslash return unless @backslash_quote @backslash_character = "\\".encode(@encoding) @escaped_backslash_character = Regexp.escape(@backslash_character) @escaped_backslash = Regexp.new(@escaped_backslash_character) if @quote_character.nil? @backslash_quote_character = nil else @backslash_quote_character = @backslash_character + @escaped_quote_character end end def prepare_skip_lines skip_lines = @options[:skip_lines] case skip_lines when String @skip_lines = skip_lines.encode(@encoding) when Regexp, nil @skip_lines = skip_lines else unless skip_lines.respond_to?(:match) message = ":skip_lines has to respond to \#match: #{skip_lines.inspect}" raise ArgumentError, message end @skip_lines = skip_lines end end def prepare_strip @strip = @options[:strip] @escaped_strip = nil @strip_value = nil @rstrip_value = nil if @strip.is_a?(String) case @strip.length when 0 raise ArgumentError, ":strip must not be an empty String" when 1 # ok else raise ArgumentError, ":strip doesn't support 2 or more characters yet" end @strip = @strip.encode(@encoding) @escaped_strip = Regexp.escape(@strip) if @quote_character @strip_value = Regexp.new(@escaped_strip + "+".encode(@encoding)) @rstrip_value = Regexp.new(@escaped_strip + "+\\z".encode(@encoding)) end @need_robust_parsing = true elsif @strip strip_values = " \t\f\v" @escaped_strip = strip_values.encode(@encoding) if @quote_character @strip_value = Regexp.new("[#{strip_values}]+".encode(@encoding)) @rstrip_value = Regexp.new("[#{strip_values}]+\\z".encode(@encoding)) end @need_robust_parsing = true end end begin StringScanner.new("x").scan("x") rescue TypeError @@string_scanner_scan_accept_string = false else @@string_scanner_scan_accept_string = true end def prepare_separators column_separator = @options[:column_separator] @column_separator = column_separator.to_s.encode(@encoding) if @column_separator.size < 1 message = ":col_sep must be 1 or more characters: " message += column_separator.inspect raise ArgumentError, message end @row_separator = resolve_row_separator(@options[:row_separator]).encode(@encoding) @escaped_column_separator = Regexp.escape(@column_separator) @escaped_first_column_separator = Regexp.escape(@column_separator[0]) if @column_separator.size > 1 @column_end = Regexp.new(@escaped_column_separator) @column_ends = @column_separator.each_char.collect do \|char\| Regexp.new(Regexp.escape(char)) end @first_column_separators = Regexp.new(@escaped_first_column_separator + "+".encode(@encoding)) else if @@string_scanner_scan_accept_string @column_end = @column_separator else @column_end = Regexp.new(@escaped_column_separator) end @column_ends = nil @first_column_separators = nil end escaped_row_separator = Regexp.escape(@row_separator) @row_end = Regexp.new(escaped_row_separator) if @row_separator.size > 1 @row_ends = @row_separator.each_char.collect do \|char\| Regexp.new(Regexp.escape(char)) end else @row_ends = nil end @cr = "\r".encode(@encoding) @lf = "\n".encode(@encoding) @cr_or_lf = Regexp.new("[\r\n]".encode(@encoding)) @not_line_end = Regexp.new("[^\r\n]+".encode(@encoding)) end def prepare_quoted if @quote_character @quotes = Regexp.new(@escaped_quote_character + "+".encode(@encoding)) no_quoted_values = @escaped_quote_character.dup if @backslash_quote no_quoted_values << @escaped_backslash_character end @quoted_value = Regexp.new("[^".encode(@encoding) + no_quoted_values + "]+".encode(@encoding)) end if @escaped_strip @split_column_separator = Regexp.new(@escaped_strip + "".encode(@encoding) + @escaped_column_separator + @escaped_strip + "".encode(@encoding)) else if @column_separator == " ".encode(@encoding) @split_column_separator = Regexp.new(@escaped_column_separator) else @split_column_separator = @column_separator end end end def prepare_unquoted return if @quote_character.nil? no_unquoted_values = "\r\n".encode(@encoding) no_unquoted_values << @escaped_first_column_separator unless @liberal_parsing no_unquoted_values << @escaped_quote_character end @unquoted_value = Regexp.new("[^".encode(@encoding) + no_unquoted_values + "]+".encode(@encoding)) end def resolve_row_separator(separator) if separator == :auto cr = "\r".encode(@encoding) lf = "\n".encode(@encoding) if @input.is_a?(StringIO) pos = @input.pos separator = detect_row_separator(@input.read, cr, lf) @input.seek(pos) elsif @input.respond_to?(:gets) if @input.is_a?(File) chunk_size = 32 * 1024 else chunk_size = 1024 end begin while separator == :auto # # if we run out of data, it's probably a single line # (ensure will set default value) # break unless sample = @input.gets(nil, chunk_size) # extend sample if we're unsure of the line ending if sample.end_with?(cr) sample << (@input.gets(nil, 1) \|\| "") end @samples << sample separator = detect_row_separator(sample, cr, lf) end rescue IOError # do nothing: ensure will set default end end separator = $INPUT_RECORD_SEPARATOR if separator == :auto end separator.to_s.encode(@encoding) end def detect_row_separator(sample, cr, lf) lf_index = sample.index(lf) if lf_index cr_index = sample[0, lf_index].index(cr) else cr_index = sample.index(cr) end if cr_index and lf_index if cr_index + 1 == lf_index cr + lf elsif cr_index < lf_index cr else lf end elsif cr_index cr elsif lf_index lf else :auto end end def prepare_line @lineno = 0 @last_line = nil @scanner = nil end def last_line if @scanner @last_line \|\|= @scanner.keep_end else @last_line end end def prepare_header @return_headers = @options[:return_headers] headers = @options[:headers] case headers when Array @raw_headers = headers @use_headers = true when String @raw_headers = parse_headers(headers) @use_headers = true when nil, false @raw_headers = nil @use_headers = false else @raw_headers = nil @use_headers = true end if @raw_headers @headers = adjust_headers(@raw_headers) else @headers = nil end end def parse_headers(row) CSV.parse_line(row, col_sep: @column_separator, row_sep: @row_separator, quote_char: @quote_character) end def adjust_headers(headers) adjusted_headers = @header_fields_converter.convert(headers, nil, @lineno) adjusted_headers.each {\|h\| h.freeze if h.is_a? String} adjusted_headers end def prepare_parser @may_quoted = may_quoted? end def may_quoted? return false if @quote_character.nil? if @input.is_a?(StringIO) pos = @input.pos sample = @input.read @input.seek(pos) else return false if @samples.empty? sample = @samples.first end sample[0, 128].index(@quote_character) end SCANNER_TEST = (ENV["CSV_PARSER_SCANNER_TEST"] == "yes") if SCANNER_TEST class UnoptimizedStringIO def initialize(string) @io = StringIO.new(string, "rb:#{string.encoding}") end def gets(args) @io.gets(args) end def each_line(args, &block) @io.each_line(args, &block) end def eof? @io.eof? end end def build_scanner inputs = @samples.collect do \|sample\| UnoptimizedStringIO.new(sample) end if @input.is_a?(StringIO) inputs << UnoptimizedStringIO.new(@input.read) else inputs << @input end chunk_size = ENV["CSV_PARSER_SCANNER_TEST_CHUNK_SIZE"] \|\| "1" InputsScanner.new(inputs, @encoding, chunk_size: Integer(chunk_size, 10)) end else def build_scanner string = nil if @samples.empty? and @input.is_a?(StringIO) string = @input.read elsif @samples.size == 1 and @input.respond_to?(:eof?) and @input.eof? string = @samples[0] end if string unless string.valid_encoding? index = string.lines(@row_separator).index do \|line\| !line.valid_encoding? end if index message = "Invalid byte sequence in #{@encoding}" raise MalformedCSVError.new(message, @lineno + index + 1) end end Scanner.new(string) else inputs = @samples.collect do \|sample\| StringIO.new(sample) end inputs << @input InputsScanner.new(inputs, @encoding) end end end def skip_needless_lines return unless @skip_lines until @scanner.eos? @scanner.keep_start line = @scanner.scan_all(@not_line_end) \|\| "".encode(@encoding) line << @row_separator if parse_row_end if skip_line?(line) @lineno += 1 @scanner.keep_drop else @scanner.keep_back return end end end def skip_line?(line) line = line.delete_suffix(@row_separator) case @skip_lines when String line.include?(@skip_lines) when Regexp @skip_lines.match?(line) else @skip_lines.match(line) end end def parse_no_quote(&block) @scanner.each_line(@row_separator) do \|line\| next if @skip_lines and skip_line?(line) original_line = line line = line.delete_suffix(@row_separator) if line.empty? next if @skip_blanks row = [] else line = strip_value(line) row = line.split(@split_column_separator, -1) n_columns = row.size i = 0 while i < n_columns row[i] = nil if row[i].empty? i += 1 end end @last_line = original_line emit_row(row, &block) end end def parse_quotable_loose(&block) @scanner.keep_start @scanner.each_line(@row_separator) do \|line\| if @skip_lines and skip_line?(line) @scanner.keep_drop @scanner.keep_start next end original_line = line line = line.delete_suffix(@row_separator) if line.empty? if @skip_blanks @scanner.keep_drop @scanner.keep_start next end row = [] elsif line.include?(@cr) or line.include?(@lf) @scanner.keep_back @need_robust_parsing = true return parse_quotable_robust(&block) else row = line.split(@split_column_separator, -1) n_columns = row.size i = 0 while i < n_columns column = row[i] if column.empty? row[i] = nil else n_quotes = column.count(@quote_character) if n_quotes.zero? # no quote elsif n_quotes == 2 and column.start_with?(@quote_character) and column.end_with?(@quote_character) row[i] = column[1..-2] else @scanner.keep_back @need_robust_parsing = true return parse_quotable_robust(&block) end end i += 1 end end @scanner.keep_drop @scanner.keep_start @last_line = original_line emit_row(row, &block) end @scanner.keep_drop end def parse_quotable_robust(&block) row = [] skip_needless_lines start_row while true @quoted_column_value = false @unquoted_column_value = false @scanner.scan_all(@strip_value) if @strip_value value = parse_column_value if value @scanner.scan_all(@strip_value) if @strip_value if @field_size_limit and value.size >= @field_size_limit ignore_broken_line raise MalformedCSVError.new("Field size exceeded", @lineno) end end if parse_column_end row << value elsif parse_row_end if row.empty? and value.nil? emit_row([], &block) unless @skip_blanks else row << value emit_row(row, &block) row = [] end skip_needless_lines start_row elsif @scanner.eos? break if row.empty? and value.nil? row << value emit_row(row, &block) break else if @quoted_column_value ignore_broken_line message = "Any value after quoted field isn't allowed" raise MalformedCSVError.new(message, @lineno) elsif @unquoted_column_value and (new_line = @scanner.scan(@cr_or_lf)) ignore_broken_line message = "Unquoted fields do not allow new line " + "<#{new_line.inspect}>" raise MalformedCSVError.new(message, @lineno) elsif @scanner.rest.start_with?(@quote_character) ignore_broken_line message = "Illegal quoting" raise MalformedCSVError.new(message, @lineno) elsif (new_line = @scanner.scan(@cr_or_lf)) ignore_broken_line message = "New line must be <#{@row_separator.inspect}> " + "not <#{new_line.inspect}>" raise MalformedCSVError.new(message, @lineno) else ignore_broken_line raise MalformedCSVError.new("TODO: Meaningful message", @lineno) end end end end def parse_column_value if @liberal_parsing quoted_value = parse_quoted_column_value if quoted_value @scanner.scan_all(@strip_value) if @strip_value unquoted_value = parse_unquoted_column_value if unquoted_value if @double_quote_outside_quote unquoted_value = unquoted_value.gsub(@quote_character * 2, @quote_character) if quoted_value.empty? # %Q{""...} case return @quote_character + unquoted_value end end @quote_character + quoted_value + @quote_character + unquoted_value else quoted_value end else parse_unquoted_column_value end elsif @may_quoted parse_quoted_column_value \|\| parse_unquoted_column_value else parse_unquoted_column_value \|\| parse_quoted_column_value end end def parse_unquoted_column_value value = @scanner.scan_all(@unquoted_value) return nil unless value @unquoted_column_value = true if @first_column_separators while true @scanner.keep_start is_column_end = @column_ends.all? do \|column_end\| @scanner.scan(column_end) end @scanner.keep_back break if is_column_end sub_separator = @scanner.scan_all(@first_column_separators) break if sub_separator.nil? value << sub_separator sub_value = @scanner.scan_all(@unquoted_value) break if sub_value.nil? value << sub_value end end value.gsub!(@backslash_quote_character, @quote_character) if @backslash_quote if @rstrip_value value.gsub!(@rstrip_value, "") end value end def parse_quoted_column_value quotes = @scanner.scan_all(@quotes) return nil unless quotes @quoted_column_value = true n_quotes = quotes.size if (n_quotes % 2).zero? quotes[0, (n_quotes - 2) / 2] else value = quotes[0, (n_quotes - 1) / 2] while true quoted_value = @scanner.scan_all(@quoted_value) value << quoted_value if quoted_value if @backslash_quote if @scanner.scan(@escaped_backslash) if @scanner.scan(@escaped_quote) value << @quote_character else value << @backslash_character end next end end quotes = @scanner.scan_all(@quotes) unless quotes ignore_broken_line message = "Unclosed quoted field" raise MalformedCSVError.new(message, @lineno) end n_quotes = quotes.size if n_quotes == 1 break elsif (n_quotes % 2) == 1 value << quotes[0, (n_quotes - 1) / 2] break else value << quotes[0, n_quotes / 2] end end value end end def parse_column_end return true if @scanner.scan(@column_end) return false unless @column_ends @scanner.keep_start if @column_ends.all? {\|column_end\| @scanner.scan(column_end)} @scanner.keep_drop true else @scanner.keep_back false end end def parse_row_end return true if @scanner.scan(@row_end) return false unless @row_ends @scanner.keep_start if @row_ends.all? {\|row_end\| @scanner.scan(row_end)} @scanner.keep_drop true else @scanner.keep_back false end end def strip_value(value) return value unless @strip return nil if value.nil? case @strip when String size = value.size while value.start_with?(@strip) size -= 1 value = value[1, size] end while value.end_with?(@strip) size -= 1 value = value[0, size] end else value.strip! end value end def ignore_broken_line @scanner.scan_all(@not_line_end) @scanner.scan_all(@cr_or_lf) @lineno += 1 end def start_row if @last_line @last_line = nil else @scanner.keep_drop end @scanner.keep_start end def emit_row(row, &block) @lineno += 1 raw_row = row if @use_headers if @headers.nil? @headers = adjust_headers(row) return unless @return_headers row = Row.new(@headers, row, true) else row = Row.new(@headers, @fields_converter.convert(raw_row, @headers, @lineno)) end else # convert fields, if needed... row = @fields_converter.convert(raw_row, nil, @lineno) end # inject unconverted fields and accessor, if requested... if @unconverted_fields and not row.respond_to?(:unconverted_fields) add_unconverted_fields(row, raw_row) end yield(row) end # This method injects an instance variable <tt>unconverted_fields</tt> into # +row+ and an accessor method for +row+ called unconverted_fields(). The # variable is set to the contents of +fields+. def add_unconverted_fields(row, fields) class << row attr_reader :unconverted_fields end row.instance_variable_set(:@unconverted_fields, fields) row end end end Back

Edit File : parser.rb | Size : 31.33 KB

# frozen_string_literal: true

require "strscan"

require_relative "delete_suffix"
require_relative "match_p"
require_relative "row"
require_relative "table"

using CSV::DeleteSuffix if CSV.const_defined?(:DeleteSuffix)
using CSV::MatchP if CSV.const_defined?(:MatchP)

class CSV
  # Note: Don't use this class directly. This is an internal class.
  class Parser
    #
    # A CSV::Parser is m17n aware. The parser works in the Encoding of the IO
    # or String object being read from or written to. Your data is never transcoded
    # (unless you ask Ruby to transcode it for you) and will literally be parsed in
    # the Encoding it is in. Thus CSV will return Arrays or Rows of Strings in the
    # Encoding of your data. This is accomplished by transcoding the parser itself
    # into your Encoding.
    #

# Raised when encoding is invalid.
    class InvalidEncoding < StandardError
    end

#
    # CSV::Scanner receives a CSV output, scans it and return the content.
    # It also controls the life cycle of the object with its methods +keep_start+,
    # +keep_end+, +keep_back+, +keep_drop+.
    #
    # Uses StringScanner (the official strscan gem). Strscan provides lexical
    # scanning operations on a String. We inherit its object and take advantage
    # on the methods. For more information, please visit:
    # https://ruby-doc.org/stdlib-2.6.1/libdoc/strscan/rdoc/StringScanner.html
    #
    class Scanner < StringScanner
      alias_method :scan_all, :scan

def initialize(*args)
        super
        @keeps = []
      end

def each_line(row_separator)
        position = pos
        rest.each_line(row_separator) do |line|
          position += line.bytesize
          self.pos = position
          yield(line)
        end
      end

def keep_start
        @keeps.push(pos)
      end

def keep_end
        start = @keeps.pop
        string.byteslice(start, pos - start)
      end

def keep_back
        self.pos = @keeps.pop
      end

def keep_drop
        @keeps.pop
      end
    end

#
    # CSV::InputsScanner receives IO inputs, encoding and the chunk_size.
    # It also controls the life cycle of the object with its methods +keep_start+,
    # +keep_end+, +keep_back+, +keep_drop+.
    #
    # CSV::InputsScanner.scan() tries to match with pattern at the current position.
    # If there's a match, the scanner advances the “scan pointer” and returns the matched string.
    # Otherwise, the scanner returns nil.
    #
    # CSV::InputsScanner.rest() returns the “rest” of the string (i.e. everything after the scan pointer).
    # If there is no more data (eos? = true), it returns "".
    #
    class InputsScanner
      def initialize(inputs, encoding, chunk_size: 8192)
        @inputs = inputs.dup
        @encoding = encoding
        @chunk_size = chunk_size
        @last_scanner = @inputs.empty?
        @keeps = []
        read_chunk
      end

def each_line(row_separator)
        buffer = nil
        input = @scanner.rest
        position = @scanner.pos
        offset = 0
        n_row_separator_chars = row_separator.size
        while true
          input.each_line(row_separator) do |line|
            @scanner.pos += line.bytesize
            if buffer
              if n_row_separator_chars == 2 and
                buffer.end_with?(row_separator[0]) and
                line.start_with?(row_separator[1])
                buffer << line[0]
                line = line[1..-1]
                position += buffer.bytesize + offset
                @scanner.pos = position
                offset = 0
                yield(buffer)
                buffer = nil
                next if line.empty?
              else
                buffer << line
                line = buffer
                buffer = nil
              end
            end
            if line.end_with?(row_separator)
              position += line.bytesize + offset
              @scanner.pos = position
              offset = 0
              yield(line)
            else
              buffer = line
            end
          end
          break unless read_chunk
          input = @scanner.rest
          position = @scanner.pos
          offset = -buffer.bytesize if buffer
        end
        yield(buffer) if buffer
      end

def scan(pattern)
        value = @scanner.scan(pattern)
        return value if @last_scanner

if value
          read_chunk if @scanner.eos?
          return value
        else
          nil
        end
      end

def scan_all(pattern)
        value = @scanner.scan(pattern)
        return value if @last_scanner

return nil if value.nil?
        while @scanner.eos? and read_chunk and (sub_value = @scanner.scan(pattern))
          value << sub_value
        end
        value
      end

def eos?
        @scanner.eos?
      end

def keep_start
        @keeps.push([@scanner.pos, nil])
      end

def keep_end
        start, buffer = @keeps.pop
        keep = @scanner.string.byteslice(start, @scanner.pos - start)
        if buffer
          buffer << keep
          keep = buffer
        end
        keep
      end

def keep_back
        start, buffer = @keeps.pop
        if buffer
          string = @scanner.string
          keep = string.byteslice(start, string.bytesize - start)
          if keep and not keep.empty?
            @inputs.unshift(StringIO.new(keep))
            @last_scanner = false
          end
          @scanner = StringScanner.new(buffer)
        else
          @scanner.pos = start
        end
        read_chunk if @scanner.eos?
      end

def keep_drop
        @keeps.pop
      end

def rest
        @scanner.rest
      end

private
      def read_chunk
        return false if @last_scanner

unless @keeps.empty?
          keep = @keeps.last
          keep_start = keep[0]
          string = @scanner.string
          keep_data = string.byteslice(keep_start, @scanner.pos - keep_start)
          if keep_data
            keep_buffer = keep[1]
            if keep_buffer
              keep_buffer << keep_data
            else
              keep[1] = keep_data.dup
            end
          end
          keep[0] = 0
        end

input = @inputs.first
        case input
        when StringIO
          string = input.read
          raise InvalidEncoding unless string.valid_encoding?
          @scanner = StringScanner.new(string)
          @inputs.shift
          @last_scanner = @inputs.empty?
          true
        else
          chunk = input.gets(nil, @chunk_size)
          if chunk
            raise InvalidEncoding unless chunk.valid_encoding?
            @scanner = StringScanner.new(chunk)
            if input.respond_to?(:eof?) and input.eof?
              @inputs.shift
              @last_scanner = @inputs.empty?
            end
            true
          else
            @scanner = StringScanner.new("".encode(@encoding))
            @inputs.shift
            @last_scanner = @inputs.empty?
            if @last_scanner
              false
            else
              read_chunk
            end
          end
        end
      end
    end

def initialize(input, options)
      @input = input
      @options = options
      @samples = []

prepare
    end

def column_separator
      @column_separator
    end

def row_separator
      @row_separator
    end

def quote_character
      @quote_character
    end

def field_size_limit
      @field_size_limit
    end

def skip_lines
      @skip_lines
    end

def unconverted_fields?
      @unconverted_fields
    end

def headers
      @headers
    end

def header_row?
      @use_headers and @headers.nil?
    end

def return_headers?
      @return_headers
    end

def skip_blanks?
      @skip_blanks
    end

def liberal_parsing?
      @liberal_parsing
    end

def lineno
      @lineno
    end

def line
      last_line
    end

def parse(&block)
      return to_enum(__method__) unless block_given?

if @return_headers and @headers and @raw_headers
        headers = Row.new(@headers, @raw_headers, true)
        if @unconverted_fields
          headers = add_unconverted_fields(headers, [])
        end
        yield headers
      end

begin
        @scanner ||= build_scanner
        if quote_character.nil?
          parse_no_quote(&block)
        elsif @need_robust_parsing
          parse_quotable_robust(&block)
        else
          parse_quotable_loose(&block)
        end
      rescue InvalidEncoding
        if @scanner
          ignore_broken_line
          lineno = @lineno
        else
          lineno = @lineno + 1
        end
        message = "Invalid byte sequence in #{@encoding}"
        raise MalformedCSVError.new(message, lineno)
      end
    end

def use_headers?
      @use_headers
    end

private
    # A set of tasks to prepare the file in order to parse it
    def prepare
      prepare_variable
      prepare_quote_character
      prepare_backslash
      prepare_skip_lines
      prepare_strip
      prepare_separators
      prepare_quoted
      prepare_unquoted
      prepare_line
      prepare_header
      prepare_parser
    end

def prepare_variable
      @need_robust_parsing = false
      @encoding = @options[:encoding]
      liberal_parsing = @options[:liberal_parsing]
      if liberal_parsing
        @liberal_parsing = true
        if liberal_parsing.is_a?(Hash)
          @double_quote_outside_quote =
            liberal_parsing[:double_quote_outside_quote]
          @backslash_quote = liberal_parsing[:backslash_quote]
        else
          @double_quote_outside_quote = false
          @backslash_quote = false
        end
        @need_robust_parsing = true
      else
        @liberal_parsing = false
        @backslash_quote = false
      end
      @unconverted_fields = @options[:unconverted_fields]
      @field_size_limit = @options[:field_size_limit]
      @skip_blanks = @options[:skip_blanks]
      @fields_converter = @options[:fields_converter]
      @header_fields_converter = @options[:header_fields_converter]
    end

def prepare_quote_character
      @quote_character = @options[:quote_character]
      if @quote_character.nil?
        @escaped_quote_character = nil
        @escaped_quote = nil
      else
        @quote_character = @quote_character.to_s.encode(@encoding)
        if @quote_character.length != 1
          message = ":quote_char has to be nil or a single character String"
          raise ArgumentError, message
        end
        @double_quote_character = @quote_character * 2
        @escaped_quote_character = Regexp.escape(@quote_character)
        @escaped_quote = Regexp.new(@escaped_quote_character)
      end
    end

def prepare_backslash
      return unless @backslash_quote

@backslash_character = "\\".encode(@encoding)

@escaped_backslash_character = Regexp.escape(@backslash_character)
      @escaped_backslash = Regexp.new(@escaped_backslash_character)
      if @quote_character.nil?
        @backslash_quote_character = nil
      else
        @backslash_quote_character =
          @backslash_character + @escaped_quote_character
      end
    end

def prepare_skip_lines
      skip_lines = @options[:skip_lines]
      case skip_lines
      when String
        @skip_lines = skip_lines.encode(@encoding)
      when Regexp, nil
        @skip_lines = skip_lines
      else
        unless skip_lines.respond_to?(:match)
          message =
            ":skip_lines has to respond to \#match: #{skip_lines.inspect}"
          raise ArgumentError, message
        end
        @skip_lines = skip_lines
      end
    end

def prepare_strip
      @strip = @options[:strip]
      @escaped_strip = nil
      @strip_value = nil
      @rstrip_value = nil
      if @strip.is_a?(String)
        case @strip.length
        when 0
          raise ArgumentError, ":strip must not be an empty String"
        when 1
          # ok
        else
          raise ArgumentError, ":strip doesn't support 2 or more characters yet"
        end
        @strip = @strip.encode(@encoding)
        @escaped_strip = Regexp.escape(@strip)
        if @quote_character
          @strip_value = Regexp.new(@escaped_strip +
                                    "+".encode(@encoding))
          @rstrip_value = Regexp.new(@escaped_strip +
                                     "+\\z".encode(@encoding))
        end
        @need_robust_parsing = true
      elsif @strip
        strip_values = " \t\f\v"
        @escaped_strip = strip_values.encode(@encoding)
        if @quote_character
          @strip_value = Regexp.new("[#{strip_values}]+".encode(@encoding))
          @rstrip_value = Regexp.new("[#{strip_values}]+\\z".encode(@encoding))
        end
        @need_robust_parsing = true
      end
    end

begin
      StringScanner.new("x").scan("x")
    rescue TypeError
      @@string_scanner_scan_accept_string = false
    else
      @@string_scanner_scan_accept_string = true
    end

def prepare_separators
      column_separator = @options[:column_separator]
      @column_separator = column_separator.to_s.encode(@encoding)
      if @column_separator.size < 1
        message = ":col_sep must be 1 or more characters: "
        message += column_separator.inspect
        raise ArgumentError, message
      end
      @row_separator =
        resolve_row_separator(@options[:row_separator]).encode(@encoding)

@escaped_column_separator = Regexp.escape(@column_separator)
      @escaped_first_column_separator = Regexp.escape(@column_separator[0])
      if @column_separator.size > 1
        @column_end = Regexp.new(@escaped_column_separator)
        @column_ends = @column_separator.each_char.collect do |char|
          Regexp.new(Regexp.escape(char))
        end
        @first_column_separators = Regexp.new(@escaped_first_column_separator +
                                              "+".encode(@encoding))
      else
        if @@string_scanner_scan_accept_string
          @column_end = @column_separator
        else
          @column_end = Regexp.new(@escaped_column_separator)
        end
        @column_ends = nil
        @first_column_separators = nil
      end

escaped_row_separator = Regexp.escape(@row_separator)
      @row_end = Regexp.new(escaped_row_separator)
      if @row_separator.size > 1
        @row_ends = @row_separator.each_char.collect do |char|
          Regexp.new(Regexp.escape(char))
        end
      else
        @row_ends = nil
      end

@cr = "\r".encode(@encoding)
      @lf = "\n".encode(@encoding)
      @cr_or_lf = Regexp.new("[\r\n]".encode(@encoding))
      @not_line_end = Regexp.new("[^\r\n]+".encode(@encoding))
    end

def prepare_quoted
      if @quote_character
        @quotes = Regexp.new(@escaped_quote_character +
                             "+".encode(@encoding))
        no_quoted_values = @escaped_quote_character.dup
        if @backslash_quote
          no_quoted_values << @escaped_backslash_character
        end
        @quoted_value = Regexp.new("[^".encode(@encoding) +
                                   no_quoted_values +
                                   "]+".encode(@encoding))
      end
      if @escaped_strip
        @split_column_separator = Regexp.new(@escaped_strip +
                                             "*".encode(@encoding) +
                                             @escaped_column_separator +
                                             @escaped_strip +
                                             "*".encode(@encoding))
      else
        if @column_separator == " ".encode(@encoding)
          @split_column_separator = Regexp.new(@escaped_column_separator)
        else
          @split_column_separator = @column_separator
        end
      end
    end

def prepare_unquoted
      return if @quote_character.nil?

no_unquoted_values = "\r\n".encode(@encoding)
      no_unquoted_values << @escaped_first_column_separator
      unless @liberal_parsing
        no_unquoted_values << @escaped_quote_character
      end
      @unquoted_value = Regexp.new("[^".encode(@encoding) +
                                   no_unquoted_values +
                                   "]+".encode(@encoding))
    end

def resolve_row_separator(separator)
      if separator == :auto
        cr = "\r".encode(@encoding)
        lf = "\n".encode(@encoding)
        if @input.is_a?(StringIO)
          pos = @input.pos
          separator = detect_row_separator(@input.read, cr, lf)
          @input.seek(pos)
        elsif @input.respond_to?(:gets)
          if @input.is_a?(File)
            chunk_size = 32 * 1024
          else
            chunk_size = 1024
          end
          begin
            while separator == :auto
              #
              # if we run out of data, it's probably a single line
              # (ensure will set default value)
              #
              break unless sample = @input.gets(nil, chunk_size)

# extend sample if we're unsure of the line ending
              if sample.end_with?(cr)
                sample << (@input.gets(nil, 1) || "")
              end

@samples << sample

separator = detect_row_separator(sample, cr, lf)
            end
          rescue IOError
            # do nothing:  ensure will set default
          end
        end
        separator = $INPUT_RECORD_SEPARATOR if separator == :auto
      end
      separator.to_s.encode(@encoding)
    end

def detect_row_separator(sample, cr, lf)
      lf_index = sample.index(lf)
      if lf_index
        cr_index = sample[0, lf_index].index(cr)
      else
        cr_index = sample.index(cr)
      end
      if cr_index and lf_index
        if cr_index + 1 == lf_index
          cr + lf
        elsif cr_index < lf_index
          cr
        else
          lf
        end
      elsif cr_index
        cr
      elsif lf_index
        lf
      else
        :auto
      end
    end

def prepare_line
      @lineno = 0
      @last_line = nil
      @scanner = nil
    end

def last_line
      if @scanner
        @last_line ||= @scanner.keep_end
      else
        @last_line
      end
    end

def prepare_header
      @return_headers = @options[:return_headers]

headers = @options[:headers]
      case headers
      when Array
        @raw_headers = headers
        @use_headers = true
      when String
        @raw_headers = parse_headers(headers)
        @use_headers = true
      when nil, false
        @raw_headers = nil
        @use_headers = false
      else
        @raw_headers = nil
        @use_headers = true
      end
      if @raw_headers
        @headers = adjust_headers(@raw_headers)
      else
        @headers = nil
      end
    end

def parse_headers(row)
      CSV.parse_line(row,
                     col_sep:    @column_separator,
                     row_sep:    @row_separator,
                     quote_char: @quote_character)
    end

def adjust_headers(headers)
      adjusted_headers = @header_fields_converter.convert(headers, nil, @lineno)
      adjusted_headers.each {|h| h.freeze if h.is_a? String}
      adjusted_headers
    end

def prepare_parser
      @may_quoted = may_quoted?
    end

def may_quoted?
      return false if @quote_character.nil?

if @input.is_a?(StringIO)
        pos = @input.pos
        sample = @input.read
        @input.seek(pos)
      else
        return false if @samples.empty?
        sample = @samples.first
      end
      sample[0, 128].index(@quote_character)
    end

SCANNER_TEST = (ENV["CSV_PARSER_SCANNER_TEST"] == "yes")
    if SCANNER_TEST
      class UnoptimizedStringIO
        def initialize(string)
          @io = StringIO.new(string, "rb:#{string.encoding}")
        end

def gets(*args)
          @io.gets(*args)
        end

def each_line(*args, &block)
          @io.each_line(*args, &block)
        end

def eof?
          @io.eof?
        end
      end

def build_scanner
        inputs = @samples.collect do |sample|
          UnoptimizedStringIO.new(sample)
        end
        if @input.is_a?(StringIO)
          inputs << UnoptimizedStringIO.new(@input.read)
        else
          inputs << @input
        end
        chunk_size = ENV["CSV_PARSER_SCANNER_TEST_CHUNK_SIZE"] || "1"
        InputsScanner.new(inputs,
                          @encoding,
                          chunk_size: Integer(chunk_size, 10))
      end
    else
      def build_scanner
        string = nil
        if @samples.empty? and @input.is_a?(StringIO)
          string = @input.read
        elsif @samples.size == 1 and @input.respond_to?(:eof?) and @input.eof?
          string = @samples[0]
        end
        if string
          unless string.valid_encoding?
            index = string.lines(@row_separator).index do |line|
              !line.valid_encoding?
            end
            if index
              message = "Invalid byte sequence in #{@encoding}"
              raise MalformedCSVError.new(message, @lineno + index + 1)
            end
          end
          Scanner.new(string)
        else
          inputs = @samples.collect do |sample|
            StringIO.new(sample)
          end
          inputs << @input
          InputsScanner.new(inputs, @encoding)
        end
      end
    end

def skip_needless_lines
      return unless @skip_lines

until @scanner.eos?
        @scanner.keep_start
        line = @scanner.scan_all(@not_line_end) || "".encode(@encoding)
        line << @row_separator if parse_row_end
        if skip_line?(line)
          @lineno += 1
          @scanner.keep_drop
        else
          @scanner.keep_back
          return
        end
      end
    end

def skip_line?(line)
      line = line.delete_suffix(@row_separator)
      case @skip_lines
      when String
        line.include?(@skip_lines)
      when Regexp
        @skip_lines.match?(line)
      else
        @skip_lines.match(line)
      end
    end

def parse_no_quote(&block)
      @scanner.each_line(@row_separator) do |line|
        next if @skip_lines and skip_line?(line)
        original_line = line
        line = line.delete_suffix(@row_separator)

if line.empty?
          next if @skip_blanks
          row = []
        else
          line = strip_value(line)
          row = line.split(@split_column_separator, -1)
          n_columns = row.size
          i = 0
          while i < n_columns
            row[i] = nil if row[i].empty?
            i += 1
          end
        end
        @last_line = original_line
        emit_row(row, &block)
      end
    end

def parse_quotable_loose(&block)
      @scanner.keep_start
      @scanner.each_line(@row_separator) do |line|
        if @skip_lines and skip_line?(line)
          @scanner.keep_drop
          @scanner.keep_start
          next
        end
        original_line = line
        line = line.delete_suffix(@row_separator)

if line.empty?
          if @skip_blanks
            @scanner.keep_drop
            @scanner.keep_start
            next
          end
          row = []
        elsif line.include?(@cr) or line.include?(@lf)
          @scanner.keep_back
          @need_robust_parsing = true
          return parse_quotable_robust(&block)
        else
          row = line.split(@split_column_separator, -1)
          n_columns = row.size
          i = 0
          while i < n_columns
            column = row[i]
            if column.empty?
              row[i] = nil
            else
              n_quotes = column.count(@quote_character)
              if n_quotes.zero?
                # no quote
              elsif n_quotes == 2 and
                   column.start_with?(@quote_character) and
                   column.end_with?(@quote_character)
                row[i] = column[1..-2]
              else
                @scanner.keep_back
                @need_robust_parsing = true
                return parse_quotable_robust(&block)
              end
            end
            i += 1
          end
        end
        @scanner.keep_drop
        @scanner.keep_start
        @last_line = original_line
        emit_row(row, &block)
      end
      @scanner.keep_drop
    end

def parse_quotable_robust(&block)
      row = []
      skip_needless_lines
      start_row
      while true
        @quoted_column_value = false
        @unquoted_column_value = false
        @scanner.scan_all(@strip_value) if @strip_value
        value = parse_column_value
        if value
          @scanner.scan_all(@strip_value) if @strip_value
          if @field_size_limit and value.size >= @field_size_limit
            ignore_broken_line
            raise MalformedCSVError.new("Field size exceeded", @lineno)
          end
        end
        if parse_column_end
          row << value
        elsif parse_row_end
          if row.empty? and value.nil?
            emit_row([], &block) unless @skip_blanks
          else
            row << value
            emit_row(row, &block)
            row = []
          end
          skip_needless_lines
          start_row
        elsif @scanner.eos?
          break if row.empty? and value.nil?
          row << value
          emit_row(row, &block)
          break
        else
          if @quoted_column_value
            ignore_broken_line
            message = "Any value after quoted field isn't allowed"
            raise MalformedCSVError.new(message, @lineno)
          elsif @unquoted_column_value and
                (new_line = @scanner.scan(@cr_or_lf))
            ignore_broken_line
            message = "Unquoted fields do not allow new line " +
                      "<#{new_line.inspect}>"
            raise MalformedCSVError.new(message, @lineno)
          elsif @scanner.rest.start_with?(@quote_character)
            ignore_broken_line
            message = "Illegal quoting"
            raise MalformedCSVError.new(message, @lineno)
          elsif (new_line = @scanner.scan(@cr_or_lf))
            ignore_broken_line
            message = "New line must be <#{@row_separator.inspect}> " +
                      "not <#{new_line.inspect}>"
            raise MalformedCSVError.new(message, @lineno)
          else
            ignore_broken_line
            raise MalformedCSVError.new("TODO: Meaningful message",
                                        @lineno)
          end
        end
      end
    end

def parse_column_value
      if @liberal_parsing
        quoted_value = parse_quoted_column_value
        if quoted_value
          @scanner.scan_all(@strip_value) if @strip_value
          unquoted_value = parse_unquoted_column_value
          if unquoted_value
            if @double_quote_outside_quote
              unquoted_value = unquoted_value.gsub(@quote_character * 2,
                                                   @quote_character)
              if quoted_value.empty? # %Q{""...} case
                return @quote_character + unquoted_value
              end
            end
            @quote_character + quoted_value + @quote_character + unquoted_value
          else
            quoted_value
          end
        else
          parse_unquoted_column_value
        end
      elsif @may_quoted
        parse_quoted_column_value ||
          parse_unquoted_column_value
      else
        parse_unquoted_column_value ||
          parse_quoted_column_value
      end
    end

def parse_unquoted_column_value
      value = @scanner.scan_all(@unquoted_value)
      return nil unless value

@unquoted_column_value = true
      if @first_column_separators
        while true
          @scanner.keep_start
          is_column_end = @column_ends.all? do |column_end|
            @scanner.scan(column_end)
          end
          @scanner.keep_back
          break if is_column_end
          sub_separator = @scanner.scan_all(@first_column_separators)
          break if sub_separator.nil?
          value << sub_separator
          sub_value = @scanner.scan_all(@unquoted_value)
          break if sub_value.nil?
          value << sub_value
        end
      end
      value.gsub!(@backslash_quote_character, @quote_character) if @backslash_quote
      if @rstrip_value
        value.gsub!(@rstrip_value, "")
      end
      value
    end

def parse_quoted_column_value
      quotes = @scanner.scan_all(@quotes)
      return nil unless quotes

@quoted_column_value = true
      n_quotes = quotes.size
      if (n_quotes % 2).zero?
        quotes[0, (n_quotes - 2) / 2]
      else
        value = quotes[0, (n_quotes - 1) / 2]
        while true
          quoted_value = @scanner.scan_all(@quoted_value)
          value << quoted_value if quoted_value
          if @backslash_quote
            if @scanner.scan(@escaped_backslash)
              if @scanner.scan(@escaped_quote)
                value << @quote_character
              else
                value << @backslash_character
              end
              next
            end
          end

quotes = @scanner.scan_all(@quotes)
          unless quotes
            ignore_broken_line
            message = "Unclosed quoted field"
            raise MalformedCSVError.new(message, @lineno)
          end
          n_quotes = quotes.size
          if n_quotes == 1
            break
          elsif (n_quotes % 2) == 1
            value << quotes[0, (n_quotes - 1) / 2]
            break
          else
            value << quotes[0, n_quotes / 2]
          end
        end
        value
      end
    end

def parse_column_end
      return true if @scanner.scan(@column_end)
      return false unless @column_ends

@scanner.keep_start
      if @column_ends.all? {|column_end| @scanner.scan(column_end)}
        @scanner.keep_drop
        true
      else
        @scanner.keep_back
        false
      end
    end

def parse_row_end
      return true if @scanner.scan(@row_end)
      return false unless @row_ends
      @scanner.keep_start
      if @row_ends.all? {|row_end| @scanner.scan(row_end)}
        @scanner.keep_drop
        true
      else
        @scanner.keep_back
        false
      end
    end

def strip_value(value)
      return value unless @strip
      return nil if value.nil?

case @strip
      when String
        size = value.size
        while value.start_with?(@strip)
          size -= 1
          value = value[1, size]
        end
        while value.end_with?(@strip)
          size -= 1
          value = value[0, size]
        end
      else
        value.strip!
      end
      value
    end

def ignore_broken_line
      @scanner.scan_all(@not_line_end)
      @scanner.scan_all(@cr_or_lf)
      @lineno += 1
    end

def start_row
      if @last_line
        @last_line = nil
      else
        @scanner.keep_drop
      end
      @scanner.keep_start
    end

def emit_row(row, &block)
      @lineno += 1

raw_row = row
      if @use_headers
        if @headers.nil?
          @headers = adjust_headers(row)
          return unless @return_headers
          row = Row.new(@headers, row, true)
        else
          row = Row.new(@headers,
                        @fields_converter.convert(raw_row, @headers, @lineno))
        end
      else
        # convert fields, if needed...
        row = @fields_converter.convert(raw_row, nil, @lineno)
      end

# inject unconverted fields and accessor, if requested...
      if @unconverted_fields and not row.respond_to?(:unconverted_fields)
        add_unconverted_fields(row, raw_row)
      end

yield(row)
    end

# This method injects an instance variable <tt>unconverted_fields</tt> into
    # +row+ and an accessor method for +row+ called unconverted_fields().  The
    # variable is set to the contents of +fields+.
    def add_unconverted_fields(row, fields)
      class << row
        attr_reader :unconverted_fields
      end
      row.instance_variable_set(:@unconverted_fields, fields)
      row
    end
  end
end

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