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diff --git a/lib/csv.rb b/lib/csv.rb deleted file mode 100644 index dca2a45b6a..0000000000 --- a/lib/csv.rb +++ /dev/null @@ -1,1782 +0,0 @@ -# encoding: US-ASCII -# frozen_string_literal: true -# = csv.rb -- CSV Reading and Writing -# -# Created by James Edward Gray II on 2005-10-31. -# -# See CSV for documentation. -# -# == Description -# -# Welcome to the new and improved CSV. -# -# This version of the CSV library began its life as FasterCSV. FasterCSV was -# intended as a replacement to Ruby's then standard CSV library. It was -# designed to address concerns users of that library had and it had three -# primary goals: -# -# 1. Be significantly faster than CSV while remaining a pure Ruby library. -# 2. Use a smaller and easier to maintain code base. (FasterCSV eventually -# grew larger, was also but considerably richer in features. The parsing -# core remains quite small.) -# 3. Improve on the CSV interface. -# -# Obviously, the last one is subjective. I did try to defer to the original -# interface whenever I didn't have a compelling reason to change it though, so -# hopefully this won't be too radically different. -# -# We must have met our goals because FasterCSV was renamed to CSV and replaced -# the original library as of Ruby 1.9. If you are migrating code from 1.8 or -# earlier, you may have to change your code to comply with the new interface. -# -# == What's Different From the Old CSV? -# -# I'm sure I'll miss something, but I'll try to mention most of the major -# differences I am aware of, to help others quickly get up to speed: -# -# === CSV Parsing -# -# * This parser is m17n aware. See CSV for full details. -# * This library has a stricter parser and will throw MalformedCSVErrors on -# problematic data. -# * This library has a less liberal idea of a line ending than CSV. What you -# set as the <tt>:row_sep</tt> is law. It can auto-detect your line endings -# though. -# * The old library returned empty lines as <tt>[nil]</tt>. This library calls -# them <tt>[]</tt>. -# * This library has a much faster parser. -# -# === Interface -# -# * CSV now uses Hash-style parameters to set options. -# * CSV no longer has generate_row() or parse_row(). -# * The old CSV's Reader and Writer classes have been dropped. -# * CSV::open() is now more like Ruby's open(). -# * CSV objects now support most standard IO methods. -# * CSV now has a new() method used to wrap objects like String and IO for -# reading and writing. -# * CSV::generate() is different from the old method. -# * CSV no longer supports partial reads. It works line-by-line. -# * CSV no longer allows the instance methods to override the separators for -# performance reasons. They must be set in the constructor. -# -# If you use this library and find yourself missing any functionality I have -# trimmed, please {let me know}[mailto:james@grayproductions.net]. -# -# == Documentation -# -# See CSV for documentation. -# -# == What is CSV, really? -# -# CSV maintains a pretty strict definition of CSV taken directly from -# {the RFC}[http://www.ietf.org/rfc/rfc4180.txt]. I relax the rules in only one -# place and that is to make using this library easier. CSV will parse all valid -# CSV. -# -# What you don't want to do is feed CSV invalid data. Because of the way the -# CSV format works, it's common for a parser to need to read until the end of -# the file to be sure a field is invalid. This eats a lot of time and memory. -# -# Luckily, when working with invalid CSV, Ruby's built-in methods will almost -# always be superior in every way. For example, parsing non-quoted fields is as -# easy as: -# -# data.split(",") -# -# == Questions and/or Comments -# -# Feel free to email {James Edward Gray II}[mailto:james@grayproductions.net] -# with any questions. - -require "forwardable" -require "English" -require "date" -require "stringio" -require_relative "csv/table" -require_relative "csv/row" - -# This provides String#match? and Regexp#match? for Ruby 2.3. -unless String.method_defined?(:match?) - class CSV - module MatchP - refine String do - def match?(pattern) - self =~ pattern - end - end - - refine Regexp do - def match?(string) - self =~ string - end - end - end - end - - using CSV::MatchP -end - -# -# This class provides a complete interface to CSV files and data. It offers -# tools to enable you to read and write to and from Strings or IO objects, as -# needed. -# -# The most generic interface of a class is: -# -# csv = CSV.new(string_or_io, **options) -# -# # Reading: IO object should be open for read -# csv.read # => array of rows -# # or -# csv.each do |row| -# # ... -# end -# # or -# row = csv.shift -# -# # Writing: IO object should be open for write -# csv << row -# -# There are several specialized class methods for one-statement reading or writing, -# described in the Specialized Methods section. -# -# If a String is passed into ::new, it is internally wrapped into a StringIO object. -# -# +options+ can be used for specifying the particular CSV flavor (column -# separators, row separators, value quoting and so on), and for data conversion, -# see Data Conversion section for the description of the latter. -# -# == Specialized Methods -# -# === Reading -# -# # From a file: all at once -# arr_of_rows = CSV.read("path/to/file.csv", **options) -# # iterator-style: -# CSV.foreach("path/to/file.csv", **options) do |row| -# # ... -# end -# -# # From a string -# arr_of_rows = CSV.parse("CSV,data,String", **options) -# # or -# CSV.parse("CSV,data,String", **options) do |row| -# # ... -# end -# -# === Writing -# -# # To a file -# CSV.open("path/to/file.csv", "wb") do |csv| -# csv << ["row", "of", "CSV", "data"] -# csv << ["another", "row"] -# # ... -# end -# -# # To a String -# csv_string = CSV.generate do |csv| -# csv << ["row", "of", "CSV", "data"] -# csv << ["another", "row"] -# # ... -# end -# -# === Shortcuts -# -# # Core extensions for converting one line -# csv_string = ["CSV", "data"].to_csv # to CSV -# csv_array = "CSV,String".parse_csv # from CSV -# -# # CSV() method -# CSV { |csv_out| csv_out << %w{my data here} } # to $stdout -# CSV(csv = "") { |csv_str| csv_str << %w{my data here} } # to a String -# CSV($stderr) { |csv_err| csv_err << %w{my data here} } # to $stderr -# CSV($stdin) { |csv_in| csv_in.each { |row| p row } } # from $stdin -# -# == Data Conversion -# -# === CSV with headers -# -# CSV allows to specify column names of CSV file, whether they are in data, or -# provided separately. If headers specified, reading methods return an instance -# of CSV::Table, consisting of CSV::Row. -# -# # Headers are part of data -# data = CSV.parse(<<~ROWS, headers: true) -# Name,Department,Salary -# Bob,Engeneering,1000 -# Jane,Sales,2000 -# John,Management,5000 -# ROWS -# -# data.class #=> CSV::Table -# data.first #=> #<CSV::Row "Name":"Bob" "Department":"Engeneering" "Salary":"1000"> -# data.first.to_h #=> {"Name"=>"Bob", "Department"=>"Engeneering", "Salary"=>"1000"} -# -# # Headers provided by developer -# data = CSV.parse('Bob,Engeneering,1000', headers: %i[name department salary]) -# data.first #=> #<CSV::Row name:"Bob" department:"Engeneering" salary:"1000"> -# -# === Typed data reading -# -# CSV allows to provide a set of data _converters_ e.g. transformations to try on input -# data. Converter could be a symbol from CSV::Converters constant's keys, or lambda. -# -# # Without any converters: -# CSV.parse('Bob,2018-03-01,100') -# #=> [["Bob", "2018-03-01", "100"]] -# -# # With built-in converters: -# CSV.parse('Bob,2018-03-01,100', converters: %i[numeric date]) -# #=> [["Bob", #<Date: 2018-03-01>, 100]] -# -# # With custom converters: -# CSV.parse('Bob,2018-03-01,100', converters: [->(v) { Time.parse(v) rescue v }]) -# #=> [["Bob", 2018-03-01 00:00:00 +0200, "100"]] -# -# == CSV and Character Encodings (M17n or Multilingualization) -# -# This new CSV parser is m17n savvy. 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. -# -# Some transcoding must take place, of course, to accomplish this multiencoding -# support. For example, <tt>:col_sep</tt>, <tt>:row_sep</tt>, and -# <tt>:quote_char</tt> must be transcoded to match your data. Hopefully this -# makes the entire process feel transparent, since CSV's defaults should just -# magically work for your data. However, you can set these values manually in -# the target Encoding to avoid the translation. -# -# It's also important to note that while all of CSV's core parser is now -# Encoding agnostic, some features are not. For example, the built-in -# converters will try to transcode data to UTF-8 before making conversions. -# Again, you can provide custom converters that are aware of your Encodings to -# avoid this translation. It's just too hard for me to support native -# conversions in all of Ruby's Encodings. -# -# Anyway, the practical side of this is simple: make sure IO and String objects -# passed into CSV have the proper Encoding set and everything should just work. -# CSV methods that allow you to open IO objects (CSV::foreach(), CSV::open(), -# CSV::read(), and CSV::readlines()) do allow you to specify the Encoding. -# -# One minor exception comes when generating CSV into a String with an Encoding -# that is not ASCII compatible. There's no existing data for CSV to use to -# prepare itself and thus you will probably need to manually specify the desired -# Encoding for most of those cases. It will try to guess using the fields in a -# row of output though, when using CSV::generate_line() or Array#to_csv(). -# -# I try to point out any other Encoding issues in the documentation of methods -# as they come up. -# -# This has been tested to the best of my ability with all non-"dummy" Encodings -# Ruby ships with. However, it is brave new code and may have some bugs. -# Please feel free to {report}[mailto:james@grayproductions.net] any issues you -# find with it. -# -class CSV - - # The error thrown when the parser encounters illegal CSV formatting. - class MalformedCSVError < RuntimeError - attr_reader :line_number - alias_method :lineno, :line_number - def initialize(message, line_number) - @line_number = line_number - super("#{message} in line #{line_number}.") - end - end - - # - # A FieldInfo Struct contains details about a field's position in the data - # source it was read from. CSV will pass this Struct to some blocks that make - # decisions based on field structure. See CSV.convert_fields() for an - # example. - # - # <b><tt>index</tt></b>:: The zero-based index of the field in its row. - # <b><tt>line</tt></b>:: The line of the data source this row is from. - # <b><tt>header</tt></b>:: The header for the column, when available. - # - FieldInfo = Struct.new(:index, :line, :header) - - # A Regexp used to find and convert some common Date formats. - DateMatcher = / \A(?: (\w+,?\s+)?\w+\s+\d{1,2},?\s+\d{2,4} | - \d{4}-\d{2}-\d{2} )\z /x - # A Regexp used to find and convert some common DateTime formats. - DateTimeMatcher = - / \A(?: (\w+,?\s+)?\w+\s+\d{1,2}\s+\d{1,2}:\d{1,2}:\d{1,2},?\s+\d{2,4} | - \d{4}-\d{2}-\d{2}\s\d{2}:\d{2}:\d{2} | - # ISO-8601 - \d{4}-\d{2}-\d{2} - (?:T\d{2}:\d{2}(?::\d{2}(?:\.\d+)?(?:[+-]\d{2}(?::\d{2})|Z)?)?)? - )\z /x - - # The encoding used by all converters. - ConverterEncoding = Encoding.find("UTF-8") - - # - # This Hash holds the built-in converters of CSV that can be accessed by name. - # You can select Converters with CSV.convert() or through the +options+ Hash - # passed to CSV::new(). - # - # <b><tt>:integer</tt></b>:: Converts any field Integer() accepts. - # <b><tt>:float</tt></b>:: Converts any field Float() accepts. - # <b><tt>:numeric</tt></b>:: A combination of <tt>:integer</tt> - # and <tt>:float</tt>. - # <b><tt>:date</tt></b>:: Converts any field Date::parse() accepts. - # <b><tt>:date_time</tt></b>:: Converts any field DateTime::parse() accepts. - # <b><tt>:all</tt></b>:: All built-in converters. A combination of - # <tt>:date_time</tt> and <tt>:numeric</tt>. - # - # All built-in converters transcode field data to UTF-8 before attempting a - # conversion. If your data cannot be transcoded to UTF-8 the conversion will - # fail and the field will remain unchanged. - # - # This Hash is intentionally left unfrozen and users should feel free to add - # values to it that can be accessed by all CSV objects. - # - # To add a combo field, the value should be an Array of names. Combo fields - # can be nested with other combo fields. - # - Converters = { - integer: lambda { |f| - Integer(f.encode(ConverterEncoding)) rescue f - }, - float: lambda { |f| - Float(f.encode(ConverterEncoding)) rescue f - }, - numeric: [:integer, :float], - date: lambda { |f| - begin - e = f.encode(ConverterEncoding) - e.match?(DateMatcher) ? Date.parse(e) : f - rescue # encoding conversion or date parse errors - f - end - }, - date_time: lambda { |f| - begin - e = f.encode(ConverterEncoding) - e.match?(DateTimeMatcher) ? DateTime.parse(e) : f - rescue # encoding conversion or date parse errors - f - end - }, - all: [:date_time, :numeric], - } - - # - # This Hash holds the built-in header converters of CSV that can be accessed - # by name. You can select HeaderConverters with CSV.header_convert() or - # through the +options+ Hash passed to CSV::new(). - # - # <b><tt>:downcase</tt></b>:: Calls downcase() on the header String. - # <b><tt>:symbol</tt></b>:: Leading/trailing spaces are dropped, string is - # downcased, remaining spaces are replaced with - # underscores, non-word characters are dropped, - # and finally to_sym() is called. - # - # All built-in header converters transcode header data to UTF-8 before - # attempting a conversion. If your data cannot be transcoded to UTF-8 the - # conversion will fail and the header will remain unchanged. - # - # This Hash is intentionally left unfrozen and users should feel free to add - # values to it that can be accessed by all CSV objects. - # - # To add a combo field, the value should be an Array of names. Combo fields - # can be nested with other combo fields. - # - HeaderConverters = { - downcase: lambda { |h| h.encode(ConverterEncoding).downcase }, - symbol: lambda { |h| - h.encode(ConverterEncoding).downcase.gsub(/[^\s\w]+/, "").strip. - gsub(/\s+/, "_").to_sym - } - } - - # - # The options used when no overrides are given by calling code. They are: - # - # <b><tt>:col_sep</tt></b>:: <tt>","</tt> - # <b><tt>:row_sep</tt></b>:: <tt>:auto</tt> - # <b><tt>:quote_char</tt></b>:: <tt>'"'</tt> - # <b><tt>:field_size_limit</tt></b>:: +nil+ - # <b><tt>:converters</tt></b>:: +nil+ - # <b><tt>:unconverted_fields</tt></b>:: +nil+ - # <b><tt>:headers</tt></b>:: +false+ - # <b><tt>:return_headers</tt></b>:: +false+ - # <b><tt>:header_converters</tt></b>:: +nil+ - # <b><tt>:skip_blanks</tt></b>:: +false+ - # <b><tt>:force_quotes</tt></b>:: +false+ - # <b><tt>:skip_lines</tt></b>:: +nil+ - # <b><tt>:liberal_parsing</tt></b>:: +false+ - # - DEFAULT_OPTIONS = { - col_sep: ",", - row_sep: :auto, - quote_char: '"', - field_size_limit: nil, - converters: nil, - unconverted_fields: nil, - headers: false, - return_headers: false, - header_converters: nil, - skip_blanks: false, - force_quotes: false, - skip_lines: nil, - liberal_parsing: false, - }.freeze - - # - # This method will return a CSV instance, just like CSV::new(), but the - # instance will be cached and returned for all future calls to this method for - # the same +data+ object (tested by Object#object_id()) with the same - # +options+. - # - # If a block is given, the instance is passed to the block and the return - # value becomes the return value of the block. - # - def self.instance(data = $stdout, **options) - # create a _signature_ for this method call, data object and options - sig = [data.object_id] + - options.values_at(*DEFAULT_OPTIONS.keys.sort_by { |sym| sym.to_s }) - - # fetch or create the instance for this signature - @@instances ||= Hash.new - instance = (@@instances[sig] ||= new(data, options)) - - if block_given? - yield instance # run block, if given, returning result - else - instance # or return the instance - end - end - - # - # :call-seq: - # filter( **options ) { |row| ... } - # filter( input, **options ) { |row| ... } - # filter( input, output, **options ) { |row| ... } - # - # This method is a convenience for building Unix-like filters for CSV data. - # Each row is yielded to the provided block which can alter it as needed. - # After the block returns, the row is appended to +output+ altered or not. - # - # The +input+ and +output+ arguments can be anything CSV::new() accepts - # (generally String or IO objects). If not given, they default to - # <tt>ARGF</tt> and <tt>$stdout</tt>. - # - # The +options+ parameter is also filtered down to CSV::new() after some - # clever key parsing. Any key beginning with <tt>:in_</tt> or - # <tt>:input_</tt> will have that leading identifier stripped and will only - # be used in the +options+ Hash for the +input+ object. Keys starting with - # <tt>:out_</tt> or <tt>:output_</tt> affect only +output+. All other keys - # are assigned to both objects. - # - # The <tt>:output_row_sep</tt> +option+ defaults to - # <tt>$INPUT_RECORD_SEPARATOR</tt> (<tt>$/</tt>). - # - def self.filter(input=nil, output=nil, **options) - # parse options for input, output, or both - in_options, out_options = Hash.new, {row_sep: $INPUT_RECORD_SEPARATOR} - options.each do |key, value| - case key.to_s - when /\Ain(?:put)?_(.+)\Z/ - in_options[$1.to_sym] = value - when /\Aout(?:put)?_(.+)\Z/ - out_options[$1.to_sym] = value - else - in_options[key] = value - out_options[key] = value - end - end - # build input and output wrappers - input = new(input || ARGF, in_options) - output = new(output || $stdout, out_options) - - # read, yield, write - input.each do |row| - yield row - output << row - end - end - - # - # This method is intended as the primary interface for reading CSV files. You - # pass a +path+ and any +options+ you wish to set for the read. Each row of - # file will be passed to the provided +block+ in turn. - # - # The +options+ parameter can be anything CSV::new() understands. This method - # also understands an additional <tt>:encoding</tt> parameter that you can use - # to specify the Encoding of the data in the file to be read. You must provide - # this unless your data is in Encoding::default_external(). CSV will use this - # to determine how to parse the data. You may provide a second Encoding to - # have the data transcoded as it is read. For example, - # <tt>encoding: "UTF-32BE:UTF-8"</tt> would read UTF-32BE data from the file - # but transcode it to UTF-8 before CSV parses it. - # - def self.foreach(path, **options, &block) - return to_enum(__method__, path, options) unless block_given? - open(path, options) do |csv| - csv.each(&block) - end - end - - # - # :call-seq: - # generate( str, **options ) { |csv| ... } - # generate( **options ) { |csv| ... } - # - # This method wraps a String you provide, or an empty default String, in a - # CSV object which is passed to the provided block. You can use the block to - # append CSV rows to the String and when the block exits, the final String - # will be returned. - # - # Note that a passed String *is* modified by this method. Call dup() before - # passing if you need a new String. - # - # The +options+ parameter can be anything CSV::new() understands. This method - # understands an additional <tt>:encoding</tt> parameter when not passed a - # String to set the base Encoding for the output. CSV needs this hint if you - # plan to output non-ASCII compatible data. - # - def self.generate(str=nil, **options) - # add a default empty String, if none was given - if str - str = StringIO.new(str) - str.seek(0, IO::SEEK_END) - else - encoding = options[:encoding] - str = String.new - str.force_encoding(encoding) if encoding - end - csv = new(str, options) # wrap - yield csv # yield for appending - csv.string # return final String - end - - # - # This method is a shortcut for converting a single row (Array) into a CSV - # String. - # - # The +options+ parameter can be anything CSV::new() understands. This method - # understands an additional <tt>:encoding</tt> parameter to set the base - # Encoding for the output. This method will try to guess your Encoding from - # the first non-+nil+ field in +row+, if possible, but you may need to use - # this parameter as a backup plan. - # - # The <tt>:row_sep</tt> +option+ defaults to <tt>$INPUT_RECORD_SEPARATOR</tt> - # (<tt>$/</tt>) when calling this method. - # - def self.generate_line(row, **options) - options = {row_sep: $INPUT_RECORD_SEPARATOR}.merge(options) - str = String.new - if options[:encoding] - str.force_encoding(options[:encoding]) - elsif field = row.find { |f| not f.nil? } - str.force_encoding(String(field).encoding) - end - (new(str, options) << row).string - end - - # - # :call-seq: - # open( filename, mode = "rb", **options ) { |faster_csv| ... } - # open( filename, **options ) { |faster_csv| ... } - # open( filename, mode = "rb", **options ) - # open( filename, **options ) - # - # This method opens an IO object, and wraps that with CSV. This is intended - # as the primary interface for writing a CSV file. - # - # You must pass a +filename+ and may optionally add a +mode+ for Ruby's - # open(). You may also pass an optional Hash containing any +options+ - # CSV::new() understands as the final argument. - # - # This method works like Ruby's open() call, in that it will pass a CSV object - # to a provided block and close it when the block terminates, or it will - # return the CSV object when no block is provided. (*Note*: This is different - # from the Ruby 1.8 CSV library which passed rows to the block. Use - # CSV::foreach() for that behavior.) - # - # You must provide a +mode+ with an embedded Encoding designator unless your - # data is in Encoding::default_external(). CSV will check the Encoding of the - # underlying IO object (set by the +mode+ you pass) to determine how to parse - # the data. You may provide a second Encoding to have the data transcoded as - # it is read just as you can with a normal call to IO::open(). For example, - # <tt>"rb:UTF-32BE:UTF-8"</tt> would read UTF-32BE data from the file but - # transcode it to UTF-8 before CSV parses it. - # - # An opened CSV object will delegate to many IO methods for convenience. You - # may call: - # - # * binmode() - # * binmode?() - # * close() - # * close_read() - # * close_write() - # * closed?() - # * eof() - # * eof?() - # * external_encoding() - # * fcntl() - # * fileno() - # * flock() - # * flush() - # * fsync() - # * internal_encoding() - # * ioctl() - # * isatty() - # * path() - # * pid() - # * pos() - # * pos=() - # * reopen() - # * seek() - # * stat() - # * sync() - # * sync=() - # * tell() - # * to_i() - # * to_io() - # * truncate() - # * tty?() - # - def self.open(filename, mode="r", **options) - # wrap a File opened with the remaining +args+ with no newline - # decorator - file_opts = {universal_newline: false}.merge(options) - - begin - f = File.open(filename, mode, file_opts) - rescue ArgumentError => e - raise unless /needs binmode/.match?(e.message) and mode == "r" - mode = "rb" - file_opts = {encoding: Encoding.default_external}.merge(file_opts) - retry - end - begin - csv = new(f, options) - rescue Exception - f.close - raise - end - - # handle blocks like Ruby's open(), not like the CSV library - if block_given? - begin - yield csv - ensure - csv.close - end - else - csv - end - end - - # - # :call-seq: - # parse( str, **options ) { |row| ... } - # parse( str, **options ) - # - # This method can be used to easily parse CSV out of a String. You may either - # provide a +block+ which will be called with each row of the String in turn, - # or just use the returned Array of Arrays (when no +block+ is given). - # - # You pass your +str+ to read from, and an optional +options+ containing - # anything CSV::new() understands. - # - def self.parse(*args, &block) - csv = new(*args) - - return csv.each(&block) if block_given? - - # slurp contents, if no block is given - begin - csv.read - ensure - csv.close - end - end - - # - # This method is a shortcut for converting a single line of a CSV String into - # an Array. Note that if +line+ contains multiple rows, anything beyond the - # first row is ignored. - # - # The +options+ parameter can be anything CSV::new() understands. - # - def self.parse_line(line, **options) - new(line, options).shift - end - - # - # Use to slurp a CSV file into an Array of Arrays. Pass the +path+ to the - # file and any +options+ CSV::new() understands. This method also understands - # an additional <tt>:encoding</tt> parameter that you can use to specify the - # Encoding of the data in the file to be read. You must provide this unless - # your data is in Encoding::default_external(). CSV will use this to determine - # how to parse the data. You may provide a second Encoding to have the data - # transcoded as it is read. For example, - # <tt>encoding: "UTF-32BE:UTF-8"</tt> would read UTF-32BE data from the file - # but transcode it to UTF-8 before CSV parses it. - # - def self.read(path, *options) - open(path, *options) { |csv| csv.read } - end - - # Alias for CSV::read(). - def self.readlines(*args) - read(*args) - end - - # - # A shortcut for: - # - # CSV.read( path, { headers: true, - # converters: :numeric, - # header_converters: :symbol }.merge(options) ) - # - def self.table(path, **options) - read( path, { headers: true, - converters: :numeric, - header_converters: :symbol }.merge(options) ) - end - - # - # This constructor will wrap either a String or IO object passed in +data+ for - # reading and/or writing. In addition to the CSV instance methods, several IO - # methods are delegated. (See CSV::open() for a complete list.) If you pass - # a String for +data+, you can later retrieve it (after writing to it, for - # example) with CSV.string(). - # - # Note that a wrapped String will be positioned at the beginning (for - # reading). If you want it at the end (for writing), use CSV::generate(). - # If you want any other positioning, pass a preset StringIO object instead. - # - # You may set any reading and/or writing preferences in the +options+ Hash. - # Available options are: - # - # <b><tt>:col_sep</tt></b>:: The String placed between each field. - # This String will be transcoded into - # the data's Encoding before parsing. - # <b><tt>:row_sep</tt></b>:: The String appended to the end of each - # row. This can be set to the special - # <tt>:auto</tt> setting, which requests - # that CSV automatically discover this - # from the data. Auto-discovery reads - # ahead in the data looking for the next - # <tt>"\r\n"</tt>, <tt>"\n"</tt>, or - # <tt>"\r"</tt> sequence. A sequence - # will be selected even if it occurs in - # a quoted field, assuming that you - # would have the same line endings - # there. If none of those sequences is - # found, +data+ is <tt>ARGF</tt>, - # <tt>STDIN</tt>, <tt>STDOUT</tt>, or - # <tt>STDERR</tt>, or the stream is only - # available for output, the default - # <tt>$INPUT_RECORD_SEPARATOR</tt> - # (<tt>$/</tt>) is used. Obviously, - # discovery takes a little time. Set - # manually if speed is important. Also - # note that IO objects should be opened - # in binary mode on Windows if this - # feature will be used as the - # line-ending translation can cause - # problems with resetting the document - # position to where it was before the - # read ahead. This String will be - # transcoded into the data's Encoding - # before parsing. - # <b><tt>:quote_char</tt></b>:: The character used to quote fields. - # This has to be a single character - # String. This is useful for - # application that incorrectly use - # <tt>'</tt> as the quote character - # instead of the correct <tt>"</tt>. - # CSV will always consider a double - # sequence of this character to be an - # escaped quote. This String will be - # transcoded into the data's Encoding - # before parsing. - # <b><tt>:field_size_limit</tt></b>:: This is a maximum size CSV will read - # ahead looking for the closing quote - # for a field. (In truth, it reads to - # the first line ending beyond this - # size.) If a quote cannot be found - # within the limit CSV will raise a - # MalformedCSVError, assuming the data - # is faulty. You can use this limit to - # prevent what are effectively DoS - # attacks on the parser. However, this - # limit can cause a legitimate parse to - # fail and thus is set to +nil+, or off, - # by default. - # <b><tt>:converters</tt></b>:: An Array of names from the Converters - # Hash and/or lambdas that handle custom - # conversion. A single converter - # doesn't have to be in an Array. All - # built-in converters try to transcode - # fields to UTF-8 before converting. - # The conversion will fail if the data - # cannot be transcoded, leaving the - # field unchanged. - # <b><tt>:unconverted_fields</tt></b>:: If set to +true+, an - # unconverted_fields() method will be - # added to all returned rows (Array or - # CSV::Row) that will return the fields - # as they were before conversion. Note - # that <tt>:headers</tt> supplied by - # Array or String were not fields of the - # document and thus will have an empty - # Array attached. - # <b><tt>:headers</tt></b>:: If set to <tt>:first_row</tt> or - # +true+, the initial row of the CSV - # file will be treated as a row of - # headers. If set to an Array, the - # contents will be used as the headers. - # If set to a String, the String is run - # through a call of CSV::parse_line() - # with the same <tt>:col_sep</tt>, - # <tt>:row_sep</tt>, and - # <tt>:quote_char</tt> as this instance - # to produce an Array of headers. This - # setting causes CSV#shift() to return - # rows as CSV::Row objects instead of - # Arrays and CSV#read() to return - # CSV::Table objects instead of an Array - # of Arrays. - # <b><tt>:return_headers</tt></b>:: When +false+, header rows are silently - # swallowed. If set to +true+, header - # rows are returned in a CSV::Row object - # with identical headers and - # fields (save that the fields do not go - # through the converters). - # <b><tt>:write_headers</tt></b>:: When +true+ and <tt>:headers</tt> is - # set, a header row will be added to the - # output. - # <b><tt>:header_converters</tt></b>:: Identical in functionality to - # <tt>:converters</tt> save that the - # conversions are only made to header - # rows. All built-in converters try to - # transcode headers to UTF-8 before - # converting. The conversion will fail - # if the data cannot be transcoded, - # leaving the header unchanged. - # <b><tt>:skip_blanks</tt></b>:: When set to a +true+ value, CSV will - # skip over any empty rows. Note that - # this setting will not skip rows that - # contain column separators, even if - # the rows contain no actual data. If - # you want to skip rows that contain - # separators but no content, consider - # using <tt>:skip_lines</tt>, or - # inspecting fields.compact.empty? on - # each row. - # <b><tt>:force_quotes</tt></b>:: When set to a +true+ value, CSV will - # quote all CSV fields it creates. - # <b><tt>:skip_lines</tt></b>:: When set to an object responding to - # <tt>match</tt>, every line matching - # it is considered a comment and ignored - # during parsing. When set to a String, - # it is first converted to a Regexp. - # When set to +nil+ no line is considered - # a comment. If the passed object does - # not respond to <tt>match</tt>, - # <tt>ArgumentError</tt> is thrown. - # <b><tt>:liberal_parsing</tt></b>:: When set to a +true+ value, CSV will - # attempt to parse input not conformant - # with RFC 4180, such as double quotes - # in unquoted fields. - # <b><tt>:nil_value</tt></b>:: When set an object, any values of an - # empty field are replaced by the set - # object, not nil. - # <b><tt>:empty_value</tt></b>:: When set an object, any values of a - # blank string field is replaced by - # the set object. - # - # See CSV::DEFAULT_OPTIONS for the default settings. - # - # Options cannot be overridden in the instance methods for performance reasons, - # so be sure to set what you want here. - # - def initialize(data, col_sep: ",", row_sep: :auto, quote_char: '"', field_size_limit: nil, - converters: nil, unconverted_fields: nil, headers: false, return_headers: false, - write_headers: nil, header_converters: nil, skip_blanks: false, force_quotes: false, - skip_lines: nil, liberal_parsing: false, internal_encoding: nil, external_encoding: nil, encoding: nil, - nil_value: nil, - empty_value: "") - raise ArgumentError.new("Cannot parse nil as CSV") if data.nil? - - # create the IO object we will read from - @io = data.is_a?(String) ? StringIO.new(data) : data - @encoding = determine_encoding(encoding, internal_encoding) - # - # prepare for building safe regular expressions in the target encoding, - # if we can transcode the needed characters - # - @re_esc = "\\".encode(@encoding).freeze rescue "" - @re_chars = /#{%"[-\\]\\[\\.^$?*+{}()|# \r\n\t\f\v]".encode(@encoding)}/ - @unconverted_fields = unconverted_fields - - # Stores header row settings and loads header converters, if needed. - @use_headers = headers - @return_headers = return_headers - @write_headers = write_headers - - # headers must be delayed until shift(), in case they need a row of content - @headers = nil - - @nil_value = nil_value - @empty_value = empty_value - @empty_value_is_empty_string = (empty_value == "") - - init_separators(col_sep, row_sep, quote_char, force_quotes) - init_parsers(skip_blanks, field_size_limit, liberal_parsing) - init_converters(converters, :@converters, :convert) - init_converters(header_converters, :@header_converters, :header_convert) - init_comments(skip_lines) - - @force_encoding = !!encoding - - # track our own lineno since IO gets confused about line-ends is CSV fields - @lineno = 0 - - # make sure headers have been assigned - if header_row? and [Array, String].include? @use_headers.class and @write_headers - parse_headers # won't read data for Array or String - self << @headers - end - end - - # - # The encoded <tt>:col_sep</tt> used in parsing and writing. See CSV::new - # for details. - # - attr_reader :col_sep - # - # The encoded <tt>:row_sep</tt> used in parsing and writing. See CSV::new - # for details. - # - attr_reader :row_sep - # - # The encoded <tt>:quote_char</tt> used in parsing and writing. See CSV::new - # for details. - # - attr_reader :quote_char - # The limit for field size, if any. See CSV::new for details. - attr_reader :field_size_limit - - # The regex marking a line as a comment. See CSV::new for details - attr_reader :skip_lines - - # - # Returns the current list of converters in effect. See CSV::new for details. - # Built-in converters will be returned by name, while others will be returned - # as is. - # - def converters - @converters.map do |converter| - name = Converters.rassoc(converter) - name ? name.first : converter - end - end - # - # Returns +true+ if unconverted_fields() to parsed results. See CSV::new - # for details. - # - def unconverted_fields?() @unconverted_fields end - # - # Returns +nil+ if headers will not be used, +true+ if they will but have not - # yet been read, or the actual headers after they have been read. See - # CSV::new for details. - # - def headers - @headers || true if @use_headers - end - # - # Returns +true+ if headers will be returned as a row of results. - # See CSV::new for details. - # - def return_headers?() @return_headers end - # Returns +true+ if headers are written in output. See CSV::new for details. - def write_headers?() @write_headers end - # - # Returns the current list of converters in effect for headers. See CSV::new - # for details. Built-in converters will be returned by name, while others - # will be returned as is. - # - def header_converters - @header_converters.map do |converter| - name = HeaderConverters.rassoc(converter) - name ? name.first : converter - end - end - # - # Returns +true+ blank lines are skipped by the parser. See CSV::new - # for details. - # - def skip_blanks?() @skip_blanks end - # Returns +true+ if all output fields are quoted. See CSV::new for details. - def force_quotes?() @force_quotes end - # Returns +true+ if illegal input is handled. See CSV::new for details. - def liberal_parsing?() @liberal_parsing end - - # - # The Encoding CSV is parsing or writing in. This will be the Encoding you - # receive parsed data in and/or the Encoding data will be written in. - # - attr_reader :encoding - - # - # The line number of the last row read from this file. Fields with nested - # line-end characters will not affect this count. - # - attr_reader :lineno, :line - - ### IO and StringIO Delegation ### - - extend Forwardable - def_delegators :@io, :binmode, :binmode?, :close, :close_read, :close_write, - :closed?, :eof, :eof?, :external_encoding, :fcntl, - :fileno, :flock, :flush, :fsync, :internal_encoding, - :ioctl, :isatty, :path, :pid, :pos, :pos=, :reopen, - :seek, :stat, :string, :sync, :sync=, :tell, :to_i, - :to_io, :truncate, :tty? - - # Rewinds the underlying IO object and resets CSV's lineno() counter. - def rewind - @headers = nil - @lineno = 0 - - @io.rewind - end - - ### End Delegation ### - - # - # The primary write method for wrapped Strings and IOs, +row+ (an Array or - # CSV::Row) is converted to CSV and appended to the data source. When a - # CSV::Row is passed, only the row's fields() are appended to the output. - # - # The data source must be open for writing. - # - def <<(row) - # make sure headers have been assigned - if header_row? and [Array, String].include? @use_headers.class and !@write_headers - parse_headers # won't read data for Array or String - end - - # handle CSV::Row objects and Hashes - row = case row - when self.class::Row then row.fields - when Hash then @headers.map { |header| row[header] } - else row - end - - @headers = row if header_row? - @lineno += 1 - - output = row.map(&@quote).join(@col_sep) + @row_sep # quote and separate - if @io.is_a?(StringIO) and - output.encoding != (encoding = raw_encoding) - if @force_encoding - output = output.encode(encoding) - elsif (compatible_encoding = Encoding.compatible?(@io.string, output)) - @io.set_encoding(compatible_encoding) - @io.seek(0, IO::SEEK_END) - end - end - @io << output - - self # for chaining - end - alias_method :add_row, :<< - alias_method :puts, :<< - - # - # :call-seq: - # convert( name ) - # convert { |field| ... } - # convert { |field, field_info| ... } - # - # You can use this method to install a CSV::Converters built-in, or provide a - # block that handles a custom conversion. - # - # If you provide a block that takes one argument, it will be passed the field - # and is expected to return the converted value or the field itself. If your - # block takes two arguments, it will also be passed a CSV::FieldInfo Struct, - # containing details about the field. Again, the block should return a - # converted field or the field itself. - # - def convert(name = nil, &converter) - add_converter(:@converters, self.class::Converters, name, &converter) - end - - # - # :call-seq: - # header_convert( name ) - # header_convert { |field| ... } - # header_convert { |field, field_info| ... } - # - # Identical to CSV#convert(), but for header rows. - # - # Note that this method must be called before header rows are read to have any - # effect. - # - def header_convert(name = nil, &converter) - add_converter( :@header_converters, - self.class::HeaderConverters, - name, - &converter ) - end - - include Enumerable - - # - # Yields each row of the data source in turn. - # - # Support for Enumerable. - # - # The data source must be open for reading. - # - def each - if block_given? - while row = shift - yield row - end - else - to_enum - end - end - - # - # Slurps the remaining rows and returns an Array of Arrays. - # - # The data source must be open for reading. - # - def read - rows = to_a - if @use_headers - Table.new(rows) - else - rows - end - end - alias_method :readlines, :read - - # Returns +true+ if the next row read will be a header row. - def header_row? - @use_headers and @headers.nil? - end - - # - # The primary read method for wrapped Strings and IOs, a single row is pulled - # from the data source, parsed and returned as an Array of fields (if header - # rows are not used) or a CSV::Row (when header rows are used). - # - # The data source must be open for reading. - # - def shift - ######################################################################### - ### This method is purposefully kept a bit long as simple conditional ### - ### checks are faster than numerous (expensive) method calls. ### - ######################################################################### - - # handle headers not based on document content - if header_row? and @return_headers and - [Array, String].include? @use_headers.class - if @unconverted_fields - return add_unconverted_fields(parse_headers, Array.new) - else - return parse_headers - end - end - - # - # it can take multiple calls to <tt>@io.gets()</tt> to get a full line, - # because of \r and/or \n characters embedded in quoted fields - # - in_extended_col = false - csv = Array.new - - loop do - # add another read to the line - unless parse = @io.gets(@row_sep) - return nil - end - - if in_extended_col - @line.concat(parse) - else - @line = parse.clone - end - - begin - parse.sub!(@parsers[:line_end], "") - rescue ArgumentError - unless parse.valid_encoding? - message = "Invalid byte sequence in #{parse.encoding}" - raise MalformedCSVError.new(message, lineno + 1) - end - raise - end - - if csv.empty? - # - # I believe a blank line should be an <tt>Array.new</tt>, not Ruby 1.8 - # CSV's <tt>[nil]</tt> - # - if parse.empty? - @lineno += 1 - if @skip_blanks - next - elsif @unconverted_fields - return add_unconverted_fields(Array.new, Array.new) - elsif @use_headers - return self.class::Row.new(@headers, Array.new) - else - return Array.new - end - end - end - - next if @skip_lines and @skip_lines.match parse - - parts = parse.split(@col_sep_split_separator, -1) - if parts.empty? - if in_extended_col - csv[-1] << @col_sep # will be replaced with a @row_sep after the parts.each loop - else - csv << nil - end - end - - # This loop is the hot path of csv parsing. Some things may be non-dry - # for a reason. Make sure to benchmark when refactoring. - parts.each do |part| - if in_extended_col - # If we are continuing a previous column - if part.end_with?(@quote_char) && part.count(@quote_char) % 2 != 0 - # extended column ends - csv.last << part[0..-2] - if csv.last.match?(@parsers[:stray_quote]) - raise MalformedCSVError.new("Missing or stray quote", - lineno + 1) - end - csv.last.gsub!(@double_quote_char, @quote_char) - in_extended_col = false - else - csv.last << part << @col_sep - end - elsif part.start_with?(@quote_char) - # If we are starting a new quoted column - if part.count(@quote_char) % 2 != 0 - # start an extended column - csv << (part[1..-1] << @col_sep) - in_extended_col = true - elsif part.end_with?(@quote_char) - # regular quoted column - csv << part[1..-2] - if csv.last.match?(@parsers[:stray_quote]) - raise MalformedCSVError.new("Missing or stray quote", - lineno + 1) - end - csv.last.gsub!(@double_quote_char, @quote_char) - elsif @liberal_parsing - csv << part - else - raise MalformedCSVError.new("Missing or stray quote", - lineno + 1) - end - elsif part.match?(@parsers[:quote_or_nl]) - # Unquoted field with bad characters. - if part.match?(@parsers[:nl_or_lf]) - message = "Unquoted fields do not allow \\r or \\n" - raise MalformedCSVError.new(message, lineno + 1) - else - if @liberal_parsing - csv << part - else - raise MalformedCSVError.new("Illegal quoting", lineno + 1) - end - end - else - # Regular ole unquoted field. - csv << (part.empty? ? nil : part) - end - end - - # Replace tacked on @col_sep with @row_sep if we are still in an extended - # column. - csv[-1][-1] = @row_sep if in_extended_col - - if in_extended_col - # if we're at eof?(), a quoted field wasn't closed... - if @io.eof? - raise MalformedCSVError.new("Unclosed quoted field", - lineno + 1) - elsif @field_size_limit and csv.last.size >= @field_size_limit - raise MalformedCSVError.new("Field size exceeded", - lineno + 1) - end - # otherwise, we need to loop and pull some more data to complete the row - else - @lineno += 1 - - # save fields unconverted fields, if needed... - unconverted = csv.dup if @unconverted_fields - - if @use_headers - # parse out header rows and handle CSV::Row conversions... - csv = parse_headers(csv) - else - # convert fields, if needed... - csv = convert_fields(csv) - end - - # inject unconverted fields and accessor, if requested... - if @unconverted_fields and not csv.respond_to? :unconverted_fields - add_unconverted_fields(csv, unconverted) - end - - # return the results - break csv - end - end - end - alias_method :gets, :shift - alias_method :readline, :shift - - # - # Returns a simplified description of the key CSV attributes in an - # ASCII compatible String. - # - def inspect - str = ["<#", self.class.to_s, " io_type:"] - # show type of wrapped IO - if @io == $stdout then str << "$stdout" - elsif @io == $stdin then str << "$stdin" - elsif @io == $stderr then str << "$stderr" - else str << @io.class.to_s - end - # show IO.path(), if available - if @io.respond_to?(:path) and (p = @io.path) - str << " io_path:" << p.inspect - end - # show encoding - str << " encoding:" << @encoding.name - # show other attributes - %w[ lineno col_sep row_sep - quote_char skip_blanks liberal_parsing ].each do |attr_name| - if a = instance_variable_get("@#{attr_name}") - str << " " << attr_name << ":" << a.inspect - end - end - if @use_headers - str << " headers:" << headers.inspect - end - str << ">" - begin - str.join('') - rescue # any encoding error - str.map do |s| - e = Encoding::Converter.asciicompat_encoding(s.encoding) - e ? s.encode(e) : s.force_encoding("ASCII-8BIT") - end.join('') - end - end - - private - - def determine_encoding(encoding, internal_encoding) - # honor the IO encoding if we can, otherwise default to ASCII-8BIT - io_encoding = raw_encoding(nil) - return io_encoding if io_encoding - - return Encoding.find(internal_encoding) if internal_encoding - - if encoding - encoding, = encoding.split(":", 2) if encoding.is_a?(String) - return Encoding.find(encoding) - end - - Encoding.default_internal || Encoding.default_external - end - - # - # Stores the indicated separators for later use. - # - # If auto-discovery was requested for <tt>@row_sep</tt>, this method will read - # ahead in the <tt>@io</tt> and try to find one. +ARGF+, +STDIN+, +STDOUT+, - # +STDERR+ and any stream open for output only with a default - # <tt>@row_sep</tt> of <tt>$INPUT_RECORD_SEPARATOR</tt> (<tt>$/</tt>). - # - # This method also establishes the quoting rules used for CSV output. - # - def init_separators(col_sep, row_sep, quote_char, force_quotes) - # store the selected separators - @col_sep = col_sep.to_s.encode(@encoding) - if @col_sep == " " - @col_sep_split_separator = Regexp.new(/#{Regexp.escape(@col_sep)}/) - else - @col_sep_split_separator = @col_sep - end - @row_sep = row_sep # encode after resolving :auto - @quote_char = quote_char.to_s.encode(@encoding) - @double_quote_char = @quote_char * 2 - - if @quote_char.length != 1 - raise ArgumentError, ":quote_char has to be a single character String" - end - - # - # automatically discover row separator when requested - # (not fully encoding safe) - # - if @row_sep == :auto - if [ARGF, STDIN, STDOUT, STDERR].include?(@io) or - (defined?(Zlib) and @io.class == Zlib::GzipWriter) - @row_sep = $INPUT_RECORD_SEPARATOR - else - begin - # - # remember where we were (pos() will raise an exception if @io is pipe - # or not opened for reading) - # - saved_pos = @io.pos - while @row_sep == :auto - # - # if we run out of data, it's probably a single line - # (ensure will set default value) - # - break unless sample = @io.gets(nil, 1024) - - cr = encode_str("\r") - lf = encode_str("\n") - # extend sample if we're unsure of the line ending - if sample.end_with?(cr) - sample << (@io.gets(nil, 1) || "") - end - - # try to find a standard separator - sample.each_char.each_cons(2) do |char, next_char| - case char - when cr - if next_char == lf - @row_sep = encode_str("\r\n") - else - @row_sep = cr - end - break - when lf - @row_sep = lf - break - end - end - end - - # tricky seek() clone to work around GzipReader's lack of seek() - @io.rewind - # reset back to the remembered position - while saved_pos > 1024 # avoid loading a lot of data into memory - @io.read(1024) - saved_pos -= 1024 - end - @io.read(saved_pos) if saved_pos.nonzero? - rescue IOError # not opened for reading - # do nothing: ensure will set default - rescue NoMethodError # Zlib::GzipWriter doesn't have some IO methods - # do nothing: ensure will set default - rescue SystemCallError # pipe - # do nothing: ensure will set default - ensure - # - # set default if we failed to detect - # (stream not opened for reading, a pipe, or a single line of data) - # - @row_sep = $INPUT_RECORD_SEPARATOR if @row_sep == :auto - end - end - end - @row_sep = @row_sep.to_s.encode(@encoding) - - # establish quoting rules - @force_quotes = force_quotes - do_quote = lambda do |field| - field = String(field) - encoded_quote = @quote_char.encode(field.encoding) - encoded_quote + field.gsub(encoded_quote, encoded_quote * 2) + encoded_quote - end - quotable_chars = encode_str("\r\n", @col_sep, @quote_char) - @quote = if @force_quotes - do_quote - else - lambda do |field| - if field.nil? # represent +nil+ fields as empty unquoted fields - "" - else - field = String(field) # Stringify fields - # represent empty fields as empty quoted fields - if field.empty? or - field.count(quotable_chars).nonzero? - do_quote.call(field) - else - field # unquoted field - end - end - end - end - end - - # Pre-compiles parsers and stores them by name for access during reads. - def init_parsers(skip_blanks, field_size_limit, liberal_parsing) - # store the parser behaviors - @skip_blanks = skip_blanks - @field_size_limit = field_size_limit - @liberal_parsing = liberal_parsing - - # prebuild Regexps for faster parsing - esc_row_sep = escape_re(@row_sep) - esc_quote = escape_re(@quote_char) - @parsers = { - # for detecting parse errors - quote_or_nl: encode_re("[", esc_quote, "\r\n]"), - nl_or_lf: encode_re("[\r\n]"), - stray_quote: encode_re( "[^", esc_quote, "]", esc_quote, - "[^", esc_quote, "]" ), - # safer than chomp!() - line_end: encode_re(esc_row_sep, "\\z"), - # illegal unquoted characters - return_newline: encode_str("\r\n") - } - end - - # - # Loads any converters requested during construction. - # - # If +field_name+ is set <tt>:converters</tt> (the default) field converters - # are set. When +field_name+ is <tt>:header_converters</tt> header converters - # are added instead. - # - # The <tt>:unconverted_fields</tt> option is also activated for - # <tt>:converters</tt> calls, if requested. - # - def init_converters(converters, ivar_name, convert_method) - converters = case converters - when nil then [] - when Array then converters - else [converters] - end - instance_variable_set(ivar_name, []) - convert = method(convert_method) - - # load converters - converters.each do |converter| - if converter.is_a? Proc # custom code block - convert.call(&converter) - else # by name - convert.call(converter) - end - end - end - - # Stores the pattern of comments to skip from the provided options. - # - # The pattern must respond to +.match+, else ArgumentError is raised. - # Strings are converted to a Regexp. - # - # See also CSV.new - def init_comments(skip_lines) - @skip_lines = skip_lines - @skip_lines = Regexp.new(Regexp.escape(@skip_lines)) if @skip_lines.is_a? String - if @skip_lines and not @skip_lines.respond_to?(:match) - raise ArgumentError, ":skip_lines has to respond to matches" - end - end - # - # The actual work method for adding converters, used by both CSV.convert() and - # CSV.header_convert(). - # - # This method requires the +var_name+ of the instance variable to place the - # converters in, the +const+ Hash to lookup named converters in, and the - # normal parameters of the CSV.convert() and CSV.header_convert() methods. - # - def add_converter(var_name, const, name = nil, &converter) - if name.nil? # custom converter - instance_variable_get(var_name) << converter - else # named converter - combo = const[name] - case combo - when Array # combo converter - combo.each do |converter_name| - add_converter(var_name, const, converter_name) - end - else # individual named converter - instance_variable_get(var_name) << combo - end - end - end - - # - # Processes +fields+ with <tt>@converters</tt>, or <tt>@header_converters</tt> - # if +headers+ is passed as +true+, returning the converted field set. Any - # converter that changes the field into something other than a String halts - # the pipeline of conversion for that field. This is primarily an efficiency - # shortcut. - # - def convert_fields(fields, headers = false) - if headers - converters = @header_converters - else - converters = @converters - if !@use_headers and - converters.empty? and - @nil_value.nil? and - @empty_value_is_empty_string - return fields - end - end - - fields.map.with_index do |field, index| - if field.nil? - field = @nil_value - elsif field.empty? - field = @empty_value unless @empty_value_is_empty_string - end - converters.each do |converter| - break if headers && field.nil? - field = if converter.arity == 1 # straight field converter - converter[field] - else # FieldInfo converter - header = @use_headers && !headers ? @headers[index] : nil - converter[field, FieldInfo.new(index, lineno, header)] - end - break unless field.is_a? String # short-circuit pipeline for speed - end - field # final state of each field, converted or original - end - end - - # - # This method is used to turn a finished +row+ into a CSV::Row. Header rows - # are also dealt with here, either by returning a CSV::Row with identical - # headers and fields (save that the fields do not go through the converters) - # or by reading past them to return a field row. Headers are also saved in - # <tt>@headers</tt> for use in future rows. - # - # When +nil+, +row+ is assumed to be a header row not based on an actual row - # of the stream. - # - def parse_headers(row = nil) - if @headers.nil? # header row - @headers = case @use_headers # save headers - # Array of headers - when Array then @use_headers - # CSV header String - when String - self.class.parse_line( @use_headers, - col_sep: @col_sep, - row_sep: @row_sep, - quote_char: @quote_char ) - # first row is headers - else row - end - - # prepare converted and unconverted copies - row = @headers if row.nil? - @headers = convert_fields(@headers, true) - @headers.each { |h| h.freeze if h.is_a? String } - - if @return_headers # return headers - return self.class::Row.new(@headers, row, true) - elsif not [Array, String].include? @use_headers.class # skip to field row - return shift - end - end - - self.class::Row.new(@headers, convert_fields(row)) # field 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 - - # - # This method is an encoding safe version of Regexp::escape(). It will escape - # any characters that would change the meaning of a regular expression in the - # encoding of +str+. Regular expression characters that cannot be transcoded - # to the target encoding will be skipped and no escaping will be performed if - # a backslash cannot be transcoded. - # - def escape_re(str) - str.gsub(@re_chars) {|c| @re_esc + c} - end - - # - # Builds a regular expression in <tt>@encoding</tt>. All +chunks+ will be - # transcoded to that encoding. - # - def encode_re(*chunks) - Regexp.new(encode_str(*chunks)) - end - - # - # Builds a String in <tt>@encoding</tt>. All +chunks+ will be transcoded to - # that encoding. - # - def encode_str(*chunks) - chunks.map { |chunk| chunk.encode(@encoding.name) }.join('') - end - - # - # Returns the encoding of the internal IO object or the +default+ if the - # encoding cannot be determined. - # - def raw_encoding(default = Encoding::ASCII_8BIT) - if @io.respond_to? :internal_encoding - @io.internal_encoding || @io.external_encoding - elsif @io.is_a? StringIO - @io.string.encoding - elsif @io.respond_to? :encoding - @io.encoding - else - default - end - end -end - -# Passes +args+ to CSV::instance. -# -# CSV("CSV,data").read -# #=> [["CSV", "data"]] -# -# If a block is given, the instance is passed the block and the return value -# becomes the return value of the block. -# -# CSV("CSV,data") { |c| -# c.read.any? { |a| a.include?("data") } -# } #=> true -# -# CSV("CSV,data") { |c| -# c.read.any? { |a| a.include?("zombies") } -# } #=> false -# -def CSV(*args, &block) - CSV.instance(*args, &block) -end - -require_relative "csv/version" -require_relative "csv/core_ext/array" -require_relative "csv/core_ext/string" |