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Edit File : writer.rb \| Size : 5.87 KB
# frozen_string_literal: true require_relative "input_record_separator" require_relative "row" class CSV # Note: Don't use this class directly. This is an internal class. class Writer # # A CSV::Writer receives an output, prepares the header, format and output. # It allows us to write new rows in the object and rewind it. # attr_reader :lineno attr_reader :headers def initialize(output, options) @output = output @options = options @lineno = 0 @fields_converter = nil prepare if @options[:write_headers] and @headers self << @headers end @fields_converter = @options[:fields_converter] end # # Adds a new row # def <<(row) case row when Row row = row.fields when Hash row = @headers.collect {\|header\| row[header]} end @headers \|\|= row if @use_headers @lineno += 1 if @fields_converter quoted_fields = [false] * row.size row = @fields_converter.convert(row, nil, lineno, quoted_fields) end i = -1 converted_row = row.collect do \|field\| i += 1 quote(field, i) end line = converted_row.join(@column_separator) + @row_separator if @output_encoding line = line.encode(@output_encoding) end @output << line self end # # Winds back to the beginning # def rewind @lineno = 0 @headers = nil if @options[:headers].nil? end private def prepare @encoding = @options[:encoding] prepare_header prepare_format prepare_output end def prepare_header headers = @options[:headers] case headers when Array @headers = headers @use_headers = true when String @headers = CSV.parse_line(headers, col_sep: @options[:column_separator], row_sep: @options[:row_separator], quote_char: @options[:quote_character]) @use_headers = true when true @headers = nil @use_headers = true else @headers = nil @use_headers = false end return unless @headers converter = @options[:header_fields_converter] @headers = converter.convert(@headers, nil, 0, []) @headers.each do \|header\| header.freeze if header.is_a?(String) end end def prepare_force_quotes_fields(force_quotes) @force_quotes_fields = {} force_quotes.each do \|name_or_index\| case name_or_index when Integer index = name_or_index @force_quotes_fields[index] = true when String, Symbol name = name_or_index.to_s if @headers.nil? message = ":headers is required when you use field name " + "in :force_quotes: " + "#{name_or_index.inspect}: #{force_quotes.inspect}" raise ArgumentError, message end index = @headers.index(name) next if index.nil? @force_quotes_fields[index] = true else message = ":force_quotes element must be " + "field index or field name: " + "#{name_or_index.inspect}: #{force_quotes.inspect}" raise ArgumentError, message end end end def prepare_format @column_separator = @options[:column_separator].to_s.encode(@encoding) row_separator = @options[:row_separator] if row_separator == :auto @row_separator = InputRecordSeparator.value.encode(@encoding) else @row_separator = row_separator.to_s.encode(@encoding) end @quote_character = @options[:quote_character] force_quotes = @options[:force_quotes] if force_quotes.is_a?(Array) prepare_force_quotes_fields(force_quotes) @force_quotes = false elsif force_quotes @force_quotes_fields = nil @force_quotes = true else @force_quotes_fields = nil @force_quotes = false end unless @force_quotes @quotable_pattern = Regexp.new("[\r\n".encode(@encoding) + Regexp.escape(@column_separator) + Regexp.escape(@quote_character.encode(@encoding)) + "]".encode(@encoding)) end @quote_empty = @options.fetch(:quote_empty, true) end def prepare_output @output_encoding = nil return unless @output.is_a?(StringIO) output_encoding = @output.internal_encoding \|\| @output.external_encoding if @encoding != output_encoding if @options[:force_encoding] @output_encoding = output_encoding else compatible_encoding = Encoding.compatible?(@encoding, output_encoding) if compatible_encoding @output.set_encoding(compatible_encoding) @output.seek(0, IO::SEEK_END) end end end end def quote_field(field) field = String(field) encoded_quote_character = @quote_character.encode(field.encoding) encoded_quote_character + field.gsub(encoded_quote_character, encoded_quote_character * 2) + encoded_quote_character end def quote(field, i) if @force_quotes quote_field(field) elsif @force_quotes_fields and @force_quotes_fields[i] quote_field(field) else if field.nil? # represent +nil+ fields as empty unquoted fields "" else field = String(field) # Stringify fields # represent empty fields as empty quoted fields if (@quote_empty and field.empty?) or (field.valid_encoding? and @quotable_pattern.match?(field)) quote_field(field) else field # unquoted field end end end end end end Back

Edit File : writer.rb | Size : 5.87 KB

# frozen_string_literal: true

require_relative "input_record_separator"
require_relative "row"

class CSV
  # Note: Don't use this class directly. This is an internal class.
  class Writer
    #
    # A CSV::Writer receives an output, prepares the header, format and output.
    # It allows us to write new rows in the object and rewind it.
    #
    attr_reader :lineno
    attr_reader :headers

def initialize(output, options)
      @output = output
      @options = options
      @lineno = 0
      @fields_converter = nil
      prepare
      if @options[:write_headers] and @headers
        self << @headers
      end
      @fields_converter = @options[:fields_converter]
    end

#
    # Adds a new row
    #
    def <<(row)
      case row
      when Row
        row = row.fields
      when Hash
        row = @headers.collect {|header| row[header]}
      end

@headers ||= row if @use_headers
      @lineno += 1

if @fields_converter
        quoted_fields = [false] * row.size
        row = @fields_converter.convert(row, nil, lineno, quoted_fields)
      end

i = -1
      converted_row = row.collect do |field|
        i += 1
        quote(field, i)
      end
      line = converted_row.join(@column_separator) + @row_separator
      if @output_encoding
        line = line.encode(@output_encoding)
      end
      @output << line

self
    end

#
    # Winds back to the beginning
    #
    def rewind
      @lineno = 0
      @headers = nil if @options[:headers].nil?
    end

private
    def prepare
      @encoding = @options[:encoding]

prepare_header
      prepare_format
      prepare_output
    end

def prepare_header
      headers = @options[:headers]
      case headers
      when Array
        @headers = headers
        @use_headers = true
      when String
        @headers = CSV.parse_line(headers,
                                  col_sep: @options[:column_separator],
                                  row_sep: @options[:row_separator],
                                  quote_char: @options[:quote_character])
        @use_headers = true
      when true
        @headers = nil
        @use_headers = true
      else
        @headers = nil
        @use_headers = false
      end
      return unless @headers

converter = @options[:header_fields_converter]
      @headers = converter.convert(@headers, nil, 0, [])
      @headers.each do |header|
        header.freeze if header.is_a?(String)
      end
    end

def prepare_force_quotes_fields(force_quotes)
      @force_quotes_fields = {}
      force_quotes.each do |name_or_index|
        case name_or_index
        when Integer
          index = name_or_index
          @force_quotes_fields[index] = true
        when String, Symbol
          name = name_or_index.to_s
          if @headers.nil?
            message = ":headers is required when you use field name " +
                      "in :force_quotes: " +
                      "#{name_or_index.inspect}: #{force_quotes.inspect}"
            raise ArgumentError, message
          end
          index = @headers.index(name)
          next if index.nil?
          @force_quotes_fields[index] = true
        else
          message = ":force_quotes element must be " +
                    "field index or field name: " +
                    "#{name_or_index.inspect}: #{force_quotes.inspect}"
          raise ArgumentError, message
        end
      end
    end

def prepare_format
      @column_separator = @options[:column_separator].to_s.encode(@encoding)
      row_separator = @options[:row_separator]
      if row_separator == :auto
        @row_separator = InputRecordSeparator.value.encode(@encoding)
      else
        @row_separator = row_separator.to_s.encode(@encoding)
      end
      @quote_character = @options[:quote_character]
      force_quotes = @options[:force_quotes]
      if force_quotes.is_a?(Array)
        prepare_force_quotes_fields(force_quotes)
        @force_quotes = false
      elsif force_quotes
        @force_quotes_fields = nil
        @force_quotes = true
      else
        @force_quotes_fields = nil
        @force_quotes = false
      end
      unless @force_quotes
        @quotable_pattern =
          Regexp.new("[\r\n".encode(@encoding) +
                     Regexp.escape(@column_separator) +
                     Regexp.escape(@quote_character.encode(@encoding)) +
                     "]".encode(@encoding))
      end
      @quote_empty = @options.fetch(:quote_empty, true)
    end

def prepare_output
      @output_encoding = nil
      return unless @output.is_a?(StringIO)

output_encoding = @output.internal_encoding || @output.external_encoding
      if @encoding != output_encoding
        if @options[:force_encoding]
          @output_encoding = output_encoding
        else
          compatible_encoding = Encoding.compatible?(@encoding, output_encoding)
          if compatible_encoding
            @output.set_encoding(compatible_encoding)
            @output.seek(0, IO::SEEK_END)
          end
        end
      end
    end

def quote_field(field)
      field = String(field)
      encoded_quote_character = @quote_character.encode(field.encoding)
      encoded_quote_character +
        field.gsub(encoded_quote_character,
                   encoded_quote_character * 2) +
        encoded_quote_character
    end

def quote(field, i)
      if @force_quotes
        quote_field(field)
      elsif @force_quotes_fields and @force_quotes_fields[i]
        quote_field(field)
      else
        if field.nil?  # represent +nil+ fields as empty unquoted fields
          ""
        else
          field = String(field)  # Stringify fields
          # represent empty fields as empty quoted fields
          if (@quote_empty and field.empty?) or (field.valid_encoding? and @quotable_pattern.match?(field))
            quote_field(field)
          else
            field  # unquoted field
          end
        end
      end
    end
  end
end

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