зеркало из https://github.com/github/ruby.git
2882 строки
92 KiB
Ruby
2882 строки
92 KiB
Ruby
# encoding: US-ASCII
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# frozen_string_literal: true
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# = csv.rb -- CSV Reading and Writing
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#
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# Created by James Edward Gray II on 2005-10-31.
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#
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# See CSV for documentation.
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#
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# == Description
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#
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# Welcome to the new and improved CSV.
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#
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# This version of the CSV library began its life as FasterCSV. FasterCSV was
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# intended as a replacement to Ruby's then standard CSV library. It was
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# designed to address concerns users of that library had and it had three
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# primary goals:
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#
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# 1. Be significantly faster than CSV while remaining a pure Ruby library.
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# 2. Use a smaller and easier to maintain code base. (FasterCSV eventually
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# grew larger, was also but considerably richer in features. The parsing
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# core remains quite small.)
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# 3. Improve on the CSV interface.
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#
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# Obviously, the last one is subjective. I did try to defer to the original
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# interface whenever I didn't have a compelling reason to change it though, so
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# hopefully this won't be too radically different.
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#
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# We must have met our goals because FasterCSV was renamed to CSV and replaced
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# the original library as of Ruby 1.9. If you are migrating code from 1.8 or
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# earlier, you may have to change your code to comply with the new interface.
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#
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# == What's the Different From the Old CSV?
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#
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# I'm sure I'll miss something, but I'll try to mention most of the major
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# differences I am aware of, to help others quickly get up to speed:
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#
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# === \CSV Parsing
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#
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# * This parser is m17n aware. See CSV for full details.
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# * This library has a stricter parser and will throw MalformedCSVErrors on
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# problematic data.
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# * This library has a less liberal idea of a line ending than CSV. What you
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# set as the <tt>:row_sep</tt> is law. It can auto-detect your line endings
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# though.
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# * The old library returned empty lines as <tt>[nil]</tt>. This library calls
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# them <tt>[]</tt>.
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# * This library has a much faster parser.
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#
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# === Interface
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#
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# * CSV now uses keyword parameters to set options.
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# * CSV no longer has generate_row() or parse_row().
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# * The old CSV's Reader and Writer classes have been dropped.
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# * CSV::open() is now more like Ruby's open().
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# * CSV objects now support most standard IO methods.
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# * CSV now has a new() method used to wrap objects like String and IO for
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# reading and writing.
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# * CSV::generate() is different from the old method.
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# * CSV no longer supports partial reads. It works line-by-line.
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# * CSV no longer allows the instance methods to override the separators for
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# performance reasons. They must be set in the constructor.
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#
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# If you use this library and find yourself missing any functionality I have
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# trimmed, please {let me know}[mailto:james@grayproductions.net].
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#
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# == Documentation
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#
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# See CSV for documentation.
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#
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# == What is CSV, really?
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#
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# CSV maintains a pretty strict definition of CSV taken directly from
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# {the RFC}[http://www.ietf.org/rfc/rfc4180.txt]. I relax the rules in only one
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# place and that is to make using this library easier. CSV will parse all valid
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# CSV.
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#
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# What you don't want to do is to feed CSV invalid data. Because of the way the
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# CSV format works, it's common for a parser to need to read until the end of
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# the file to be sure a field is invalid. This consumes a lot of time and memory.
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#
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# Luckily, when working with invalid CSV, Ruby's built-in methods will almost
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# always be superior in every way. For example, parsing non-quoted fields is as
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# easy as:
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#
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# data.split(",")
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#
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# == Questions and/or Comments
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#
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# Feel free to email {James Edward Gray II}[mailto:james@grayproductions.net]
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# with any questions.
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require "forwardable"
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require "date"
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require "stringio"
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require_relative "csv/fields_converter"
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require_relative "csv/input_record_separator"
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require_relative "csv/parser"
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require_relative "csv/row"
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require_relative "csv/table"
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require_relative "csv/writer"
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# == \CSV
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#
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# === In a Hurry?
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#
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# If you are familiar with \CSV data and have a particular task in mind,
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# you may want to go directly to the:
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# - {Recipes for CSV}[doc/csv/recipes/recipes_rdoc.html].
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#
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# Otherwise, read on here, about the API: classes, methods, and constants.
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#
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# === \CSV Data
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#
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# \CSV (comma-separated values) data is a text representation of a table:
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# - A _row_ _separator_ delimits table rows.
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# A common row separator is the newline character <tt>"\n"</tt>.
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# - A _column_ _separator_ delimits fields in a row.
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# A common column separator is the comma character <tt>","</tt>.
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#
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# This \CSV \String, with row separator <tt>"\n"</tt>
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# and column separator <tt>","</tt>,
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# has three rows and two columns:
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# "foo,0\nbar,1\nbaz,2\n"
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#
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# Despite the name \CSV, a \CSV representation can use different separators.
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#
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# For more about tables, see the Wikipedia article
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# "{Table (information)}[https://en.wikipedia.org/wiki/Table_(information)]",
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# especially its section
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# "{Simple table}[https://en.wikipedia.org/wiki/Table_(information)#Simple_table]"
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#
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# == \Class \CSV
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#
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# Class \CSV provides methods for:
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# - Parsing \CSV data from a \String object, a \File (via its file path), or an \IO object.
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# - Generating \CSV data to a \String object.
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#
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# To make \CSV available:
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# require 'csv'
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#
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# All examples here assume that this has been done.
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#
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# == Keeping It Simple
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#
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# A \CSV object has dozens of instance methods that offer fine-grained control
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# of parsing and generating \CSV data.
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# For many needs, though, simpler approaches will do.
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#
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# This section summarizes the singleton methods in \CSV
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# that allow you to parse and generate without explicitly
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# creating \CSV objects.
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# For details, follow the links.
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#
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# === Simple Parsing
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#
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# Parsing methods commonly return either of:
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# - An \Array of Arrays of Strings:
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# - The outer \Array is the entire "table".
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# - Each inner \Array is a row.
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# - Each \String is a field.
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# - A CSV::Table object. For details, see
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# {\CSV with Headers}[#class-CSV-label-CSV+with+Headers].
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#
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# ==== Parsing a \String
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#
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# The input to be parsed can be a string:
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# string = "foo,0\nbar,1\nbaz,2\n"
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#
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# \Method CSV.parse returns the entire \CSV data:
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# CSV.parse(string) # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
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#
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# \Method CSV.parse_line returns only the first row:
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# CSV.parse_line(string) # => ["foo", "0"]
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#
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# \CSV extends class \String with instance method String#parse_csv,
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# which also returns only the first row:
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# string.parse_csv # => ["foo", "0"]
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#
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# ==== Parsing Via a \File Path
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#
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# The input to be parsed can be in a file:
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# string = "foo,0\nbar,1\nbaz,2\n"
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# path = 't.csv'
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# File.write(path, string)
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#
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# \Method CSV.read returns the entire \CSV data:
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# CSV.read(path) # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
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#
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# \Method CSV.foreach iterates, passing each row to the given block:
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# CSV.foreach(path) do |row|
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# p row
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# end
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# Output:
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# ["foo", "0"]
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# ["bar", "1"]
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# ["baz", "2"]
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#
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# \Method CSV.table returns the entire \CSV data as a CSV::Table object:
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# CSV.table(path) # => #<CSV::Table mode:col_or_row row_count:3>
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#
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# ==== Parsing from an Open \IO Stream
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#
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# The input to be parsed can be in an open \IO stream:
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#
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# \Method CSV.read returns the entire \CSV data:
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# File.open(path) do |file|
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# CSV.read(file)
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# end # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
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#
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# As does method CSV.parse:
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# File.open(path) do |file|
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# CSV.parse(file)
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# end # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
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#
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# \Method CSV.parse_line returns only the first row:
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# File.open(path) do |file|
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# CSV.parse_line(file)
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# end # => ["foo", "0"]
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#
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# \Method CSV.foreach iterates, passing each row to the given block:
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# File.open(path) do |file|
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# CSV.foreach(file) do |row|
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# p row
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# end
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# end
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# Output:
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# ["foo", "0"]
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# ["bar", "1"]
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# ["baz", "2"]
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#
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# \Method CSV.table returns the entire \CSV data as a CSV::Table object:
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# File.open(path) do |file|
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# CSV.table(file)
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# end # => #<CSV::Table mode:col_or_row row_count:3>
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#
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# === Simple Generating
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#
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# \Method CSV.generate returns a \String;
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# this example uses method CSV#<< to append the rows
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# that are to be generated:
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# output_string = CSV.generate do |csv|
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# csv << ['foo', 0]
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# csv << ['bar', 1]
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# csv << ['baz', 2]
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# end
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# output_string # => "foo,0\nbar,1\nbaz,2\n"
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#
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# \Method CSV.generate_line returns a \String containing the single row
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# constructed from an \Array:
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# CSV.generate_line(['foo', '0']) # => "foo,0\n"
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#
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# \CSV extends class \Array with instance method <tt>Array#to_csv</tt>,
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# which forms an \Array into a \String:
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# ['foo', '0'].to_csv # => "foo,0\n"
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#
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# === "Filtering" \CSV
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#
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# \Method CSV.filter provides a Unix-style filter for \CSV data.
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# The input data is processed to form the output data:
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# in_string = "foo,0\nbar,1\nbaz,2\n"
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# out_string = ''
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# CSV.filter(in_string, out_string) do |row|
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# row[0] = row[0].upcase
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# row[1] *= 4
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# end
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# out_string # => "FOO,0000\nBAR,1111\nBAZ,2222\n"
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#
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# == \CSV Objects
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#
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# There are three ways to create a \CSV object:
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# - \Method CSV.new returns a new \CSV object.
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# - \Method CSV.instance returns a new or cached \CSV object.
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# - \Method \CSV() also returns a new or cached \CSV object.
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#
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# === Instance Methods
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#
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# \CSV has three groups of instance methods:
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# - Its own internally defined instance methods.
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# - Methods included by module Enumerable.
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# - Methods delegated to class IO. See below.
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#
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# ==== Delegated Methods
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#
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# For convenience, a CSV object will delegate to many methods in class IO.
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# (A few have wrapper "guard code" in \CSV.) You may call:
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# * IO#binmode
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# * #binmode?
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# * IO#close
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# * IO#close_read
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# * IO#close_write
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# * IO#closed?
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# * #eof
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# * #eof?
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# * IO#external_encoding
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# * IO#fcntl
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# * IO#fileno
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# * #flock
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# * IO#flush
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# * IO#fsync
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# * IO#internal_encoding
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# * #ioctl
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# * IO#isatty
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# * #path
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# * IO#pid
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# * IO#pos
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# * IO#pos=
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# * IO#reopen
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# * #rewind
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# * IO#seek
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# * #stat
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# * IO#string
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# * IO#sync
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# * IO#sync=
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# * IO#tell
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# * #to_i
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# * #to_io
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# * IO#truncate
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# * IO#tty?
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#
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# === Options
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#
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# The default values for options are:
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# DEFAULT_OPTIONS = {
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# # For both parsing and generating.
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# col_sep: ",",
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# row_sep: :auto,
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# quote_char: '"',
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# # For parsing.
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# field_size_limit: nil,
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# converters: nil,
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# unconverted_fields: nil,
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# headers: false,
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# return_headers: false,
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# header_converters: nil,
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# skip_blanks: false,
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# skip_lines: nil,
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# liberal_parsing: false,
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# nil_value: nil,
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# empty_value: "",
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# strip: false,
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# # For generating.
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# write_headers: nil,
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# quote_empty: true,
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# force_quotes: false,
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# write_converters: nil,
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# write_nil_value: nil,
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# write_empty_value: "",
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# }
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#
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# ==== Options for Parsing
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#
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# Options for parsing, described in detail below, include:
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# - +row_sep+: Specifies the row separator; used to delimit rows.
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# - +col_sep+: Specifies the column separator; used to delimit fields.
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# - +quote_char+: Specifies the quote character; used to quote fields.
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# - +field_size_limit+: Specifies the maximum field size + 1 allowed.
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# Deprecated since 3.2.3. Use +max_field_size+ instead.
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# - +max_field_size+: Specifies the maximum field size allowed.
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# - +converters+: Specifies the field converters to be used.
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# - +unconverted_fields+: Specifies whether unconverted fields are to be available.
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# - +headers+: Specifies whether data contains headers,
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# or specifies the headers themselves.
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# - +return_headers+: Specifies whether headers are to be returned.
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# - +header_converters+: Specifies the header converters to be used.
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# - +skip_blanks+: Specifies whether blanks lines are to be ignored.
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# - +skip_lines+: Specifies how comments lines are to be recognized.
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# - +strip+: Specifies whether leading and trailing whitespace are to be
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# stripped from fields. This must be compatible with +col_sep+; if it is not,
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# then an +ArgumentError+ exception will be raised.
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# - +liberal_parsing+: Specifies whether \CSV should attempt to parse
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# non-compliant data.
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# - +nil_value+: Specifies the object that is to be substituted for each null (no-text) field.
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# - +empty_value+: Specifies the object that is to be substituted for each empty field.
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#
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# :include: ../doc/csv/options/common/row_sep.rdoc
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#
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# :include: ../doc/csv/options/common/col_sep.rdoc
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#
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# :include: ../doc/csv/options/common/quote_char.rdoc
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#
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# :include: ../doc/csv/options/parsing/field_size_limit.rdoc
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#
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# :include: ../doc/csv/options/parsing/converters.rdoc
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#
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# :include: ../doc/csv/options/parsing/unconverted_fields.rdoc
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#
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# :include: ../doc/csv/options/parsing/headers.rdoc
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#
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# :include: ../doc/csv/options/parsing/return_headers.rdoc
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#
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# :include: ../doc/csv/options/parsing/header_converters.rdoc
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#
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# :include: ../doc/csv/options/parsing/skip_blanks.rdoc
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#
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# :include: ../doc/csv/options/parsing/skip_lines.rdoc
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#
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# :include: ../doc/csv/options/parsing/strip.rdoc
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#
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# :include: ../doc/csv/options/parsing/liberal_parsing.rdoc
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#
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# :include: ../doc/csv/options/parsing/nil_value.rdoc
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#
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# :include: ../doc/csv/options/parsing/empty_value.rdoc
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#
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# ==== Options for Generating
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#
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# Options for generating, described in detail below, include:
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# - +row_sep+: Specifies the row separator; used to delimit rows.
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# - +col_sep+: Specifies the column separator; used to delimit fields.
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# - +quote_char+: Specifies the quote character; used to quote fields.
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# - +write_headers+: Specifies whether headers are to be written.
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# - +force_quotes+: Specifies whether each output field is to be quoted.
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# - +quote_empty+: Specifies whether each empty output field is to be quoted.
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# - +write_converters+: Specifies the field converters to be used in writing.
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# - +write_nil_value+: Specifies the object that is to be substituted for each +nil+-valued field.
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# - +write_empty_value+: Specifies the object that is to be substituted for each empty field.
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#
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# :include: ../doc/csv/options/common/row_sep.rdoc
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#
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# :include: ../doc/csv/options/common/col_sep.rdoc
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#
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# :include: ../doc/csv/options/common/quote_char.rdoc
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#
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# :include: ../doc/csv/options/generating/write_headers.rdoc
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#
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# :include: ../doc/csv/options/generating/force_quotes.rdoc
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#
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# :include: ../doc/csv/options/generating/quote_empty.rdoc
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#
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# :include: ../doc/csv/options/generating/write_converters.rdoc
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#
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# :include: ../doc/csv/options/generating/write_nil_value.rdoc
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#
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# :include: ../doc/csv/options/generating/write_empty_value.rdoc
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#
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# === \CSV with Headers
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#
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# CSV allows to specify column names of CSV file, whether they are in data, or
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# provided separately. If headers are specified, reading methods return an instance
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# of CSV::Table, consisting of CSV::Row.
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#
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# # Headers are part of data
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# data = CSV.parse(<<~ROWS, headers: true)
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# Name,Department,Salary
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# Bob,Engineering,1000
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# Jane,Sales,2000
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# John,Management,5000
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# ROWS
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#
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# data.class #=> CSV::Table
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# data.first #=> #<CSV::Row "Name":"Bob" "Department":"Engineering" "Salary":"1000">
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# data.first.to_h #=> {"Name"=>"Bob", "Department"=>"Engineering", "Salary"=>"1000"}
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#
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# # Headers provided by developer
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# data = CSV.parse('Bob,Engineering,1000', headers: %i[name department salary])
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# data.first #=> #<CSV::Row name:"Bob" department:"Engineering" salary:"1000">
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#
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# === \Converters
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#
|
|
# By default, each value (field or header) parsed by \CSV is formed into a \String.
|
|
# You can use a _field_ _converter_ or _header_ _converter_
|
|
# to intercept and modify the parsed values:
|
|
# - See {Field Converters}[#class-CSV-label-Field+Converters].
|
|
# - See {Header Converters}[#class-CSV-label-Header+Converters].
|
|
#
|
|
# Also by default, each value to be written during generation is written 'as-is'.
|
|
# You can use a _write_ _converter_ to modify values before writing.
|
|
# - See {Write Converters}[#class-CSV-label-Write+Converters].
|
|
#
|
|
# ==== Specifying \Converters
|
|
#
|
|
# You can specify converters for parsing or generating in the +options+
|
|
# argument to various \CSV methods:
|
|
# - Option +converters+ for converting parsed field values.
|
|
# - Option +header_converters+ for converting parsed header values.
|
|
# - Option +write_converters+ for converting values to be written (generated).
|
|
#
|
|
# There are three forms for specifying converters:
|
|
# - A converter proc: executable code to be used for conversion.
|
|
# - A converter name: the name of a stored converter.
|
|
# - A converter list: an array of converter procs, converter names, and converter lists.
|
|
#
|
|
# ===== Converter Procs
|
|
#
|
|
# This converter proc, +strip_converter+, accepts a value +field+
|
|
# and returns <tt>field.strip</tt>:
|
|
# strip_converter = proc {|field| field.strip }
|
|
# In this call to <tt>CSV.parse</tt>,
|
|
# the keyword argument <tt>converters: string_converter</tt>
|
|
# specifies that:
|
|
# - \Proc +string_converter+ is to be called for each parsed field.
|
|
# - The converter's return value is to replace the +field+ value.
|
|
# Example:
|
|
# string = " foo , 0 \n bar , 1 \n baz , 2 \n"
|
|
# array = CSV.parse(string, converters: strip_converter)
|
|
# array # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
|
|
#
|
|
# A converter proc can receive a second argument, +field_info+,
|
|
# that contains details about the field.
|
|
# This modified +strip_converter+ displays its arguments:
|
|
# strip_converter = proc do |field, field_info|
|
|
# p [field, field_info]
|
|
# field.strip
|
|
# end
|
|
# string = " foo , 0 \n bar , 1 \n baz , 2 \n"
|
|
# array = CSV.parse(string, converters: strip_converter)
|
|
# array # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
|
|
# Output:
|
|
# [" foo ", #<struct CSV::FieldInfo index=0, line=1, header=nil>]
|
|
# [" 0 ", #<struct CSV::FieldInfo index=1, line=1, header=nil>]
|
|
# [" bar ", #<struct CSV::FieldInfo index=0, line=2, header=nil>]
|
|
# [" 1 ", #<struct CSV::FieldInfo index=1, line=2, header=nil>]
|
|
# [" baz ", #<struct CSV::FieldInfo index=0, line=3, header=nil>]
|
|
# [" 2 ", #<struct CSV::FieldInfo index=1, line=3, header=nil>]
|
|
# Each CSV::FieldInfo object shows:
|
|
# - The 0-based field index.
|
|
# - The 1-based line index.
|
|
# - The field header, if any.
|
|
#
|
|
# ===== Stored \Converters
|
|
#
|
|
# A converter may be given a name and stored in a structure where
|
|
# the parsing methods can find it by name.
|
|
#
|
|
# The storage structure for field converters is the \Hash CSV::Converters.
|
|
# It has several built-in converter procs:
|
|
# - <tt>:integer</tt>: converts each \String-embedded integer into a true \Integer.
|
|
# - <tt>:float</tt>: converts each \String-embedded float into a true \Float.
|
|
# - <tt>:date</tt>: converts each \String-embedded date into a true \Date.
|
|
# - <tt>:date_time</tt>: converts each \String-embedded date-time into a true \DateTime
|
|
# .
|
|
# This example creates a converter proc, then stores it:
|
|
# strip_converter = proc {|field| field.strip }
|
|
# CSV::Converters[:strip] = strip_converter
|
|
# Then the parsing method call can refer to the converter
|
|
# by its name, <tt>:strip</tt>:
|
|
# string = " foo , 0 \n bar , 1 \n baz , 2 \n"
|
|
# array = CSV.parse(string, converters: :strip)
|
|
# array # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
|
|
#
|
|
# The storage structure for header converters is the \Hash CSV::HeaderConverters,
|
|
# which works in the same way.
|
|
# It also has built-in converter procs:
|
|
# - <tt>:downcase</tt>: Downcases each header.
|
|
# - <tt>:symbol</tt>: Converts each header to a \Symbol.
|
|
#
|
|
# There is no such storage structure for write headers.
|
|
#
|
|
# In order for the parsing methods to access stored converters in non-main-Ractors, the
|
|
# storage structure must be made shareable first.
|
|
# Therefore, <tt>Ractor.make_shareable(CSV::Converters)</tt> and
|
|
# <tt>Ractor.make_shareable(CSV::HeaderConverters)</tt> must be called before the creation
|
|
# of Ractors that use the converters stored in these structures. (Since making the storage
|
|
# structures shareable involves freezing them, any custom converters that are to be used
|
|
# must be added first.)
|
|
#
|
|
# ===== Converter Lists
|
|
#
|
|
# A _converter_ _list_ is an \Array that may include any assortment of:
|
|
# - Converter procs.
|
|
# - Names of stored converters.
|
|
# - Nested converter lists.
|
|
#
|
|
# Examples:
|
|
# numeric_converters = [:integer, :float]
|
|
# date_converters = [:date, :date_time]
|
|
# [numeric_converters, strip_converter]
|
|
# [strip_converter, date_converters, :float]
|
|
#
|
|
# Like a converter proc, a converter list may be named and stored in either
|
|
# \CSV::Converters or CSV::HeaderConverters:
|
|
# CSV::Converters[:custom] = [strip_converter, date_converters, :float]
|
|
# CSV::HeaderConverters[:custom] = [:downcase, :symbol]
|
|
#
|
|
# There are two built-in converter lists:
|
|
# CSV::Converters[:numeric] # => [:integer, :float]
|
|
# CSV::Converters[:all] # => [:date_time, :numeric]
|
|
#
|
|
# ==== Field \Converters
|
|
#
|
|
# With no conversion, all parsed fields in all rows become Strings:
|
|
# string = "foo,0\nbar,1\nbaz,2\n"
|
|
# ary = CSV.parse(string)
|
|
# ary # => # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
|
|
#
|
|
# When you specify a field converter, each parsed field is passed to the converter;
|
|
# its return value becomes the stored value for the field.
|
|
# A converter might, for example, convert an integer embedded in a \String
|
|
# into a true \Integer.
|
|
# (In fact, that's what built-in field converter +:integer+ does.)
|
|
#
|
|
# There are three ways to use field \converters.
|
|
#
|
|
# - Using option {converters}[#class-CSV-label-Option+converters] with a parsing method:
|
|
# ary = CSV.parse(string, converters: :integer)
|
|
# ary # => [0, 1, 2] # => [["foo", 0], ["bar", 1], ["baz", 2]]
|
|
# - Using option {converters}[#class-CSV-label-Option+converters] with a new \CSV instance:
|
|
# csv = CSV.new(string, converters: :integer)
|
|
# # Field converters in effect:
|
|
# csv.converters # => [:integer]
|
|
# csv.read # => [["foo", 0], ["bar", 1], ["baz", 2]]
|
|
# - Using method #convert to add a field converter to a \CSV instance:
|
|
# csv = CSV.new(string)
|
|
# # Add a converter.
|
|
# csv.convert(:integer)
|
|
# csv.converters # => [:integer]
|
|
# csv.read # => [["foo", 0], ["bar", 1], ["baz", 2]]
|
|
#
|
|
# Installing a field converter does not affect already-read rows:
|
|
# csv = CSV.new(string)
|
|
# csv.shift # => ["foo", "0"]
|
|
# # Add a converter.
|
|
# csv.convert(:integer)
|
|
# csv.converters # => [:integer]
|
|
# csv.read # => [["bar", 1], ["baz", 2]]
|
|
#
|
|
# There are additional built-in \converters, and custom \converters are also supported.
|
|
#
|
|
# ===== Built-In Field \Converters
|
|
#
|
|
# The built-in field converters are in \Hash CSV::Converters:
|
|
# - Each key is a field converter name.
|
|
# - Each value is one of:
|
|
# - A \Proc field converter.
|
|
# - An \Array of field converter names.
|
|
#
|
|
# Display:
|
|
# CSV::Converters.each_pair do |name, value|
|
|
# if value.kind_of?(Proc)
|
|
# p [name, value.class]
|
|
# else
|
|
# p [name, value]
|
|
# end
|
|
# end
|
|
# Output:
|
|
# [:integer, Proc]
|
|
# [:float, Proc]
|
|
# [:numeric, [:integer, :float]]
|
|
# [:date, Proc]
|
|
# [:date_time, Proc]
|
|
# [:all, [:date_time, :numeric]]
|
|
#
|
|
# Each of these converters transcodes values to UTF-8 before attempting conversion.
|
|
# If a value cannot be transcoded to UTF-8 the conversion will
|
|
# fail and the value will remain unconverted.
|
|
#
|
|
# Converter +:integer+ converts each field that Integer() accepts:
|
|
# data = '0,1,2,x'
|
|
# # Without the converter
|
|
# csv = CSV.parse_line(data)
|
|
# csv # => ["0", "1", "2", "x"]
|
|
# # With the converter
|
|
# csv = CSV.parse_line(data, converters: :integer)
|
|
# csv # => [0, 1, 2, "x"]
|
|
#
|
|
# Converter +:float+ converts each field that Float() accepts:
|
|
# data = '1.0,3.14159,x'
|
|
# # Without the converter
|
|
# csv = CSV.parse_line(data)
|
|
# csv # => ["1.0", "3.14159", "x"]
|
|
# # With the converter
|
|
# csv = CSV.parse_line(data, converters: :float)
|
|
# csv # => [1.0, 3.14159, "x"]
|
|
#
|
|
# Converter +:numeric+ converts with both +:integer+ and +:float+..
|
|
#
|
|
# Converter +:date+ converts each field that Date::parse accepts:
|
|
# data = '2001-02-03,x'
|
|
# # Without the converter
|
|
# csv = CSV.parse_line(data)
|
|
# csv # => ["2001-02-03", "x"]
|
|
# # With the converter
|
|
# csv = CSV.parse_line(data, converters: :date)
|
|
# csv # => [#<Date: 2001-02-03 ((2451944j,0s,0n),+0s,2299161j)>, "x"]
|
|
#
|
|
# Converter +:date_time+ converts each field that DateTime::parse accepts:
|
|
# data = '2020-05-07T14:59:00-05:00,x'
|
|
# # Without the converter
|
|
# csv = CSV.parse_line(data)
|
|
# csv # => ["2020-05-07T14:59:00-05:00", "x"]
|
|
# # With the converter
|
|
# csv = CSV.parse_line(data, converters: :date_time)
|
|
# csv # => [#<DateTime: 2020-05-07T14:59:00-05:00 ((2458977j,71940s,0n),-18000s,2299161j)>, "x"]
|
|
#
|
|
# Converter +:numeric+ converts with both +:date_time+ and +:numeric+..
|
|
#
|
|
# As seen above, method #convert adds \converters to a \CSV instance,
|
|
# and method #converters returns an \Array of the \converters in effect:
|
|
# csv = CSV.new('0,1,2')
|
|
# csv.converters # => []
|
|
# csv.convert(:integer)
|
|
# csv.converters # => [:integer]
|
|
# csv.convert(:date)
|
|
# csv.converters # => [:integer, :date]
|
|
#
|
|
# ===== Custom Field \Converters
|
|
#
|
|
# You can define a custom field converter:
|
|
# strip_converter = proc {|field| field.strip }
|
|
# string = " foo , 0 \n bar , 1 \n baz , 2 \n"
|
|
# array = CSV.parse(string, converters: strip_converter)
|
|
# array # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
|
|
# You can register the converter in \Converters \Hash,
|
|
# which allows you to refer to it by name:
|
|
# CSV::Converters[:strip] = strip_converter
|
|
# string = " foo , 0 \n bar , 1 \n baz , 2 \n"
|
|
# array = CSV.parse(string, converters: :strip)
|
|
# array # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
|
|
#
|
|
# ==== Header \Converters
|
|
#
|
|
# Header converters operate only on headers (and not on other rows).
|
|
#
|
|
# There are three ways to use header \converters;
|
|
# these examples use built-in header converter +:downcase+,
|
|
# which downcases each parsed header.
|
|
#
|
|
# - Option +header_converters+ with a singleton parsing method:
|
|
# string = "Name,Count\nFoo,0\n,Bar,1\nBaz,2"
|
|
# tbl = CSV.parse(string, headers: true, header_converters: :downcase)
|
|
# tbl.class # => CSV::Table
|
|
# tbl.headers # => ["name", "count"]
|
|
#
|
|
# - Option +header_converters+ with a new \CSV instance:
|
|
# csv = CSV.new(string, header_converters: :downcase)
|
|
# # Header converters in effect:
|
|
# csv.header_converters # => [:downcase]
|
|
# tbl = CSV.parse(string, headers: true)
|
|
# tbl.headers # => ["Name", "Count"]
|
|
#
|
|
# - Method #header_convert adds a header converter to a \CSV instance:
|
|
# csv = CSV.new(string)
|
|
# # Add a header converter.
|
|
# csv.header_convert(:downcase)
|
|
# csv.header_converters # => [:downcase]
|
|
# tbl = CSV.parse(string, headers: true)
|
|
# tbl.headers # => ["Name", "Count"]
|
|
#
|
|
# ===== Built-In Header \Converters
|
|
#
|
|
# The built-in header \converters are in \Hash CSV::HeaderConverters.
|
|
# The keys there are the names of the \converters:
|
|
# CSV::HeaderConverters.keys # => [:downcase, :symbol]
|
|
#
|
|
# Converter +:downcase+ converts each header by downcasing it:
|
|
# string = "Name,Count\nFoo,0\n,Bar,1\nBaz,2"
|
|
# tbl = CSV.parse(string, headers: true, header_converters: :downcase)
|
|
# tbl.class # => CSV::Table
|
|
# tbl.headers # => ["name", "count"]
|
|
#
|
|
# Converter +:symbol+ converts each header by making it into a \Symbol:
|
|
# string = "Name,Count\nFoo,0\n,Bar,1\nBaz,2"
|
|
# tbl = CSV.parse(string, headers: true, header_converters: :symbol)
|
|
# tbl.headers # => [:name, :count]
|
|
# Details:
|
|
# - Strips leading and trailing whitespace.
|
|
# - Downcases the header.
|
|
# - Replaces embedded spaces with underscores.
|
|
# - Removes non-word characters.
|
|
# - Makes the string into a \Symbol.
|
|
#
|
|
# ===== Custom Header \Converters
|
|
#
|
|
# You can define a custom header converter:
|
|
# upcase_converter = proc {|header| header.upcase }
|
|
# string = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
|
|
# table = CSV.parse(string, headers: true, header_converters: upcase_converter)
|
|
# table # => #<CSV::Table mode:col_or_row row_count:4>
|
|
# table.headers # => ["NAME", "VALUE"]
|
|
# You can register the converter in \HeaderConverters \Hash,
|
|
# which allows you to refer to it by name:
|
|
# CSV::HeaderConverters[:upcase] = upcase_converter
|
|
# table = CSV.parse(string, headers: true, header_converters: :upcase)
|
|
# table # => #<CSV::Table mode:col_or_row row_count:4>
|
|
# table.headers # => ["NAME", "VALUE"]
|
|
#
|
|
# ===== Write \Converters
|
|
#
|
|
# When you specify a write converter for generating \CSV,
|
|
# each field to be written is passed to the converter;
|
|
# its return value becomes the new value for the field.
|
|
# A converter might, for example, strip whitespace from a field.
|
|
#
|
|
# Using no write converter (all fields unmodified):
|
|
# output_string = CSV.generate do |csv|
|
|
# csv << [' foo ', 0]
|
|
# csv << [' bar ', 1]
|
|
# csv << [' baz ', 2]
|
|
# end
|
|
# output_string # => " foo ,0\n bar ,1\n baz ,2\n"
|
|
# Using option +write_converters+ with two custom write converters:
|
|
# strip_converter = proc {|field| field.respond_to?(:strip) ? field.strip : field }
|
|
# upcase_converter = proc {|field| field.respond_to?(:upcase) ? field.upcase : field }
|
|
# write_converters = [strip_converter, upcase_converter]
|
|
# output_string = CSV.generate(write_converters: write_converters) do |csv|
|
|
# csv << [' foo ', 0]
|
|
# csv << [' bar ', 1]
|
|
# csv << [' baz ', 2]
|
|
# end
|
|
# output_string # => "FOO,0\nBAR,1\nBAZ,2\n"
|
|
#
|
|
# === 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.
|
|
# <b><tt>quoted?</tt></b>:: True or false, whether the original value is quoted or not.
|
|
#
|
|
FieldInfo = Struct.new(:index, :line, :header, :quoted?)
|
|
|
|
# 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} |
|
|
# ISO-8601 and RFC-3339 (space instead of T) recognized by DateTime.parse
|
|
\d{4}-\d{2}-\d{2}
|
|
(?:[T\s]\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")
|
|
|
|
# A \Hash containing the names and \Procs for the built-in field converters.
|
|
# See {Built-In Field Converters}[#class-CSV-label-Built-In+Field+Converters].
|
|
#
|
|
# This \Hash is intentionally left unfrozen, and may be extended with
|
|
# custom field converters.
|
|
# See {Custom Field Converters}[#class-CSV-label-Custom+Field+Converters].
|
|
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],
|
|
}
|
|
|
|
# A \Hash containing the names and \Procs for the built-in header converters.
|
|
# See {Built-In Header Converters}[#class-CSV-label-Built-In+Header+Converters].
|
|
#
|
|
# This \Hash is intentionally left unfrozen, and may be extended with
|
|
# custom field converters.
|
|
# See {Custom Header Converters}[#class-CSV-label-Custom+Header+Converters].
|
|
HeaderConverters = {
|
|
downcase: lambda { |h| h.encode(ConverterEncoding).downcase },
|
|
symbol: lambda { |h|
|
|
h.encode(ConverterEncoding).downcase.gsub(/[^\s\w]+/, "").strip.
|
|
gsub(/\s+/, "_").to_sym
|
|
},
|
|
symbol_raw: lambda { |h| h.encode(ConverterEncoding).to_sym }
|
|
}
|
|
|
|
# Default values for method options.
|
|
DEFAULT_OPTIONS = {
|
|
# For both parsing and generating.
|
|
col_sep: ",",
|
|
row_sep: :auto,
|
|
quote_char: '"',
|
|
# For parsing.
|
|
field_size_limit: nil,
|
|
max_field_size: nil,
|
|
converters: nil,
|
|
unconverted_fields: nil,
|
|
headers: false,
|
|
return_headers: false,
|
|
header_converters: nil,
|
|
skip_blanks: false,
|
|
skip_lines: nil,
|
|
liberal_parsing: false,
|
|
nil_value: nil,
|
|
empty_value: "",
|
|
strip: false,
|
|
# For generating.
|
|
write_headers: nil,
|
|
quote_empty: true,
|
|
force_quotes: false,
|
|
write_converters: nil,
|
|
write_nil_value: nil,
|
|
write_empty_value: "",
|
|
}.freeze
|
|
|
|
class << self
|
|
# :call-seq:
|
|
# instance(string, **options)
|
|
# instance(io = $stdout, **options)
|
|
# instance(string, **options) {|csv| ... }
|
|
# instance(io = $stdout, **options) {|csv| ... }
|
|
#
|
|
# Creates or retrieves cached \CSV objects.
|
|
# For arguments and options, see CSV.new.
|
|
#
|
|
# This API is not Ractor-safe.
|
|
#
|
|
# ---
|
|
#
|
|
# With no block given, returns a \CSV object.
|
|
#
|
|
# The first call to +instance+ creates and caches a \CSV object:
|
|
# s0 = 's0'
|
|
# csv0 = CSV.instance(s0)
|
|
# csv0.class # => CSV
|
|
#
|
|
# Subsequent calls to +instance+ with that _same_ +string+ or +io+
|
|
# retrieve that same cached object:
|
|
# csv1 = CSV.instance(s0)
|
|
# csv1.class # => CSV
|
|
# csv1.equal?(csv0) # => true # Same CSV object
|
|
#
|
|
# A subsequent call to +instance+ with a _different_ +string+ or +io+
|
|
# creates and caches a _different_ \CSV object.
|
|
# s1 = 's1'
|
|
# csv2 = CSV.instance(s1)
|
|
# csv2.equal?(csv0) # => false # Different CSV object
|
|
#
|
|
# All the cached objects remains available:
|
|
# csv3 = CSV.instance(s0)
|
|
# csv3.equal?(csv0) # true # Same CSV object
|
|
# csv4 = CSV.instance(s1)
|
|
# csv4.equal?(csv2) # true # Same CSV object
|
|
#
|
|
# ---
|
|
#
|
|
# When a block is given, calls the block with the created or retrieved
|
|
# \CSV object; returns the block's return value:
|
|
# CSV.instance(s0) {|csv| :foo } # => :foo
|
|
def 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)
|
|
|
|
# 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(in_string_or_io, **options) {|row| ... } -> array_of_arrays or csv_table
|
|
# filter(in_string_or_io, out_string_or_io, **options) {|row| ... } -> array_of_arrays or csv_table
|
|
# filter(**options) {|row| ... } -> array_of_arrays or csv_table
|
|
#
|
|
# - Parses \CSV from a source (\String, \IO stream, or ARGF).
|
|
# - Calls the given block with each parsed row:
|
|
# - Without headers, each row is an \Array.
|
|
# - With headers, each row is a CSV::Row.
|
|
# - Generates \CSV to an output (\String, \IO stream, or STDOUT).
|
|
# - Returns the parsed source:
|
|
# - Without headers, an \Array of \Arrays.
|
|
# - With headers, a CSV::Table.
|
|
#
|
|
# When +in_string_or_io+ is given, but not +out_string_or_io+,
|
|
# parses from the given +in_string_or_io+
|
|
# and generates to STDOUT.
|
|
#
|
|
# \String input without headers:
|
|
#
|
|
# in_string = "foo,0\nbar,1\nbaz,2"
|
|
# CSV.filter(in_string) do |row|
|
|
# row[0].upcase!
|
|
# row[1] = - row[1].to_i
|
|
# end # => [["FOO", 0], ["BAR", -1], ["BAZ", -2]]
|
|
#
|
|
# Output (to STDOUT):
|
|
#
|
|
# FOO,0
|
|
# BAR,-1
|
|
# BAZ,-2
|
|
#
|
|
# \String input with headers:
|
|
#
|
|
# in_string = "Name,Value\nfoo,0\nbar,1\nbaz,2"
|
|
# CSV.filter(in_string, headers: true) do |row|
|
|
# row[0].upcase!
|
|
# row[1] = - row[1].to_i
|
|
# end # => #<CSV::Table mode:col_or_row row_count:4>
|
|
#
|
|
# Output (to STDOUT):
|
|
#
|
|
# Name,Value
|
|
# FOO,0
|
|
# BAR,-1
|
|
# BAZ,-2
|
|
#
|
|
# \IO stream input without headers:
|
|
#
|
|
# File.write('t.csv', "foo,0\nbar,1\nbaz,2")
|
|
# File.open('t.csv') do |in_io|
|
|
# CSV.filter(in_io) do |row|
|
|
# row[0].upcase!
|
|
# row[1] = - row[1].to_i
|
|
# end
|
|
# end # => [["FOO", 0], ["BAR", -1], ["BAZ", -2]]
|
|
#
|
|
# Output (to STDOUT):
|
|
#
|
|
# FOO,0
|
|
# BAR,-1
|
|
# BAZ,-2
|
|
#
|
|
# \IO stream input with headers:
|
|
#
|
|
# File.write('t.csv', "Name,Value\nfoo,0\nbar,1\nbaz,2")
|
|
# File.open('t.csv') do |in_io|
|
|
# CSV.filter(in_io, headers: true) do |row|
|
|
# row[0].upcase!
|
|
# row[1] = - row[1].to_i
|
|
# end
|
|
# end # => #<CSV::Table mode:col_or_row row_count:4>
|
|
#
|
|
# Output (to STDOUT):
|
|
#
|
|
# Name,Value
|
|
# FOO,0
|
|
# BAR,-1
|
|
# BAZ,-2
|
|
#
|
|
# When both +in_string_or_io+ and +out_string_or_io+ are given,
|
|
# parses from +in_string_or_io+ and generates to +out_string_or_io+.
|
|
#
|
|
# \String output without headers:
|
|
#
|
|
# in_string = "foo,0\nbar,1\nbaz,2"
|
|
# out_string = ''
|
|
# CSV.filter(in_string, out_string) do |row|
|
|
# row[0].upcase!
|
|
# row[1] = - row[1].to_i
|
|
# end # => [["FOO", 0], ["BAR", -1], ["BAZ", -2]]
|
|
# out_string # => "FOO,0\nBAR,-1\nBAZ,-2\n"
|
|
#
|
|
# \String output with headers:
|
|
#
|
|
# in_string = "Name,Value\nfoo,0\nbar,1\nbaz,2"
|
|
# out_string = ''
|
|
# CSV.filter(in_string, out_string, headers: true) do |row|
|
|
# row[0].upcase!
|
|
# row[1] = - row[1].to_i
|
|
# end # => #<CSV::Table mode:col_or_row row_count:4>
|
|
# out_string # => "Name,Value\nFOO,0\nBAR,-1\nBAZ,-2\n"
|
|
#
|
|
# \IO stream output without headers:
|
|
#
|
|
# in_string = "foo,0\nbar,1\nbaz,2"
|
|
# File.open('t.csv', 'w') do |out_io|
|
|
# CSV.filter(in_string, out_io) do |row|
|
|
# row[0].upcase!
|
|
# row[1] = - row[1].to_i
|
|
# end
|
|
# end # => [["FOO", 0], ["BAR", -1], ["BAZ", -2]]
|
|
# File.read('t.csv') # => "FOO,0\nBAR,-1\nBAZ,-2\n"
|
|
#
|
|
# \IO stream output with headers:
|
|
#
|
|
# in_string = "Name,Value\nfoo,0\nbar,1\nbaz,2"
|
|
# File.open('t.csv', 'w') do |out_io|
|
|
# CSV.filter(in_string, out_io, headers: true) do |row|
|
|
# row[0].upcase!
|
|
# row[1] = - row[1].to_i
|
|
# end
|
|
# end # => #<CSV::Table mode:col_or_row row_count:4>
|
|
# File.read('t.csv') # => "Name,Value\nFOO,0\nBAR,-1\nBAZ,-2\n"
|
|
#
|
|
# When neither +in_string_or_io+ nor +out_string_or_io+ given,
|
|
# parses from {ARGF}[rdoc-ref:ARGF]
|
|
# and generates to STDOUT.
|
|
#
|
|
# Without headers:
|
|
#
|
|
# # Put Ruby code into a file.
|
|
# ruby = <<-EOT
|
|
# require 'csv'
|
|
# CSV.filter do |row|
|
|
# row[0].upcase!
|
|
# row[1] = - row[1].to_i
|
|
# end
|
|
# EOT
|
|
# File.write('t.rb', ruby)
|
|
# # Put some CSV into a file.
|
|
# File.write('t.csv', "foo,0\nbar,1\nbaz,2")
|
|
# # Run the Ruby code with CSV filename as argument.
|
|
# system(Gem.ruby, "t.rb", "t.csv")
|
|
#
|
|
# Output (to STDOUT):
|
|
#
|
|
# FOO,0
|
|
# BAR,-1
|
|
# BAZ,-2
|
|
#
|
|
# With headers:
|
|
#
|
|
# # Put Ruby code into a file.
|
|
# ruby = <<-EOT
|
|
# require 'csv'
|
|
# CSV.filter(headers: true) do |row|
|
|
# row[0].upcase!
|
|
# row[1] = - row[1].to_i
|
|
# end
|
|
# EOT
|
|
# File.write('t.rb', ruby)
|
|
# # Put some CSV into a file.
|
|
# File.write('t.csv', "Name,Value\nfoo,0\nbar,1\nbaz,2")
|
|
# # Run the Ruby code with CSV filename as argument.
|
|
# system(Gem.ruby, "t.rb", "t.csv")
|
|
#
|
|
# Output (to STDOUT):
|
|
#
|
|
# Name,Value
|
|
# FOO,0
|
|
# BAR,-1
|
|
# BAZ,-2
|
|
#
|
|
# Arguments:
|
|
#
|
|
# * Argument +in_string_or_io+ must be a \String or an \IO stream.
|
|
# * Argument +out_string_or_io+ must be a \String or an \IO stream.
|
|
# * Arguments <tt>**options</tt> must be keyword options.
|
|
# See {Options for Parsing}[#class-CSV-label-Options+for+Parsing].
|
|
def filter(input=nil, output=nil, **options)
|
|
# parse options for input, output, or both
|
|
in_options, out_options = Hash.new, {row_sep: InputRecordSeparator.value}
|
|
options.each do |key, value|
|
|
case key
|
|
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)
|
|
|
|
# process headers
|
|
need_manual_header_output =
|
|
(in_options[:headers] and
|
|
out_options[:headers] == true and
|
|
out_options[:write_headers])
|
|
if need_manual_header_output
|
|
first_row = input.shift
|
|
if first_row
|
|
if first_row.is_a?(Row)
|
|
headers = first_row.headers
|
|
yield headers
|
|
output << headers
|
|
end
|
|
yield first_row
|
|
output << first_row
|
|
end
|
|
end
|
|
|
|
# read, yield, write
|
|
input.each do |row|
|
|
yield row
|
|
output << row
|
|
end
|
|
end
|
|
|
|
#
|
|
# :call-seq:
|
|
# foreach(path_or_io, mode='r', **options) {|row| ... )
|
|
# foreach(path_or_io, mode='r', **options) -> new_enumerator
|
|
#
|
|
# Calls the block with each row read from source +path_or_io+.
|
|
#
|
|
# \Path input without headers:
|
|
#
|
|
# string = "foo,0\nbar,1\nbaz,2\n"
|
|
# in_path = 't.csv'
|
|
# File.write(in_path, string)
|
|
# CSV.foreach(in_path) {|row| p row }
|
|
#
|
|
# Output:
|
|
#
|
|
# ["foo", "0"]
|
|
# ["bar", "1"]
|
|
# ["baz", "2"]
|
|
#
|
|
# \Path input with headers:
|
|
#
|
|
# string = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
|
|
# in_path = 't.csv'
|
|
# File.write(in_path, string)
|
|
# CSV.foreach(in_path, headers: true) {|row| p row }
|
|
#
|
|
# Output:
|
|
#
|
|
# <CSV::Row "Name":"foo" "Value":"0">
|
|
# <CSV::Row "Name":"bar" "Value":"1">
|
|
# <CSV::Row "Name":"baz" "Value":"2">
|
|
#
|
|
# \IO stream input without headers:
|
|
#
|
|
# string = "foo,0\nbar,1\nbaz,2\n"
|
|
# path = 't.csv'
|
|
# File.write(path, string)
|
|
# File.open('t.csv') do |in_io|
|
|
# CSV.foreach(in_io) {|row| p row }
|
|
# end
|
|
#
|
|
# Output:
|
|
#
|
|
# ["foo", "0"]
|
|
# ["bar", "1"]
|
|
# ["baz", "2"]
|
|
#
|
|
# \IO stream input with headers:
|
|
#
|
|
# string = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
|
|
# path = 't.csv'
|
|
# File.write(path, string)
|
|
# File.open('t.csv') do |in_io|
|
|
# CSV.foreach(in_io, headers: true) {|row| p row }
|
|
# end
|
|
#
|
|
# Output:
|
|
#
|
|
# <CSV::Row "Name":"foo" "Value":"0">
|
|
# <CSV::Row "Name":"bar" "Value":"1">
|
|
# <CSV::Row "Name":"baz" "Value":"2">
|
|
#
|
|
# With no block given, returns an \Enumerator:
|
|
#
|
|
# string = "foo,0\nbar,1\nbaz,2\n"
|
|
# path = 't.csv'
|
|
# File.write(path, string)
|
|
# CSV.foreach(path) # => #<Enumerator: CSV:foreach("t.csv", "r")>
|
|
#
|
|
# Arguments:
|
|
# * Argument +path_or_io+ must be a file path or an \IO stream.
|
|
# * Argument +mode+, if given, must be a \File mode
|
|
# See {Open Mode}[https://ruby-doc.org/core/IO.html#method-c-new-label-Open+Mode].
|
|
# * Arguments <tt>**options</tt> must be keyword options.
|
|
# See {Options for Parsing}[#class-CSV-label-Options+for+Parsing].
|
|
# * This method optionally accepts an additional <tt>:encoding</tt> option
|
|
# that you can use to specify the Encoding of the data read from +path+ or +io+.
|
|
# You must provide this unless your data is in the encoding
|
|
# given by <tt>Encoding::default_external</tt>.
|
|
# Parsing 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,
|
|
# encoding: 'UTF-32BE:UTF-8'
|
|
# would read +UTF-32BE+ data from the file
|
|
# but transcode it to +UTF-8+ before parsing.
|
|
def foreach(path, mode="r", **options, &block)
|
|
return to_enum(__method__, path, mode, **options) unless block_given?
|
|
open(path, mode, **options) do |csv|
|
|
csv.each(&block)
|
|
end
|
|
end
|
|
|
|
#
|
|
# :call-seq:
|
|
# generate(csv_string, **options) {|csv| ... }
|
|
# generate(**options) {|csv| ... }
|
|
#
|
|
# * Argument +csv_string+, if given, must be a \String object;
|
|
# defaults to a new empty \String.
|
|
# * Arguments +options+, if given, should be generating options.
|
|
# See {Options for Generating}[#class-CSV-label-Options+for+Generating].
|
|
#
|
|
# ---
|
|
#
|
|
# Creates a new \CSV object via <tt>CSV.new(csv_string, **options)</tt>;
|
|
# calls the block with the \CSV object, which the block may modify;
|
|
# returns the \String generated from the \CSV object.
|
|
#
|
|
# Note that a passed \String *is* modified by this method.
|
|
# Pass <tt>csv_string</tt>.dup if the \String must be preserved.
|
|
#
|
|
# This method has one additional option: <tt>:encoding</tt>,
|
|
# which sets the base Encoding for the output if no no +str+ is specified.
|
|
# CSV needs this hint if you plan to output non-ASCII compatible data.
|
|
#
|
|
# ---
|
|
#
|
|
# Add lines:
|
|
# input_string = "foo,0\nbar,1\nbaz,2\n"
|
|
# output_string = CSV.generate(input_string) do |csv|
|
|
# csv << ['bat', 3]
|
|
# csv << ['bam', 4]
|
|
# end
|
|
# output_string # => "foo,0\nbar,1\nbaz,2\nbat,3\nbam,4\n"
|
|
# input_string # => "foo,0\nbar,1\nbaz,2\nbat,3\nbam,4\n"
|
|
# output_string.equal?(input_string) # => true # Same string, modified
|
|
#
|
|
# Add lines into new string, preserving old string:
|
|
# input_string = "foo,0\nbar,1\nbaz,2\n"
|
|
# output_string = CSV.generate(input_string.dup) do |csv|
|
|
# csv << ['bat', 3]
|
|
# csv << ['bam', 4]
|
|
# end
|
|
# output_string # => "foo,0\nbar,1\nbaz,2\nbat,3\nbam,4\n"
|
|
# input_string # => "foo,0\nbar,1\nbaz,2\n"
|
|
# output_string.equal?(input_string) # => false # Different strings
|
|
#
|
|
# Create lines from nothing:
|
|
# output_string = CSV.generate do |csv|
|
|
# csv << ['foo', 0]
|
|
# csv << ['bar', 1]
|
|
# csv << ['baz', 2]
|
|
# end
|
|
# output_string # => "foo,0\nbar,1\nbaz,2\n"
|
|
#
|
|
# ---
|
|
#
|
|
# Raises an exception if +csv_string+ is not a \String object:
|
|
# # Raises TypeError (no implicit conversion of Integer into String)
|
|
# CSV.generate(0)
|
|
#
|
|
def generate(str=nil, **options)
|
|
encoding = options[:encoding]
|
|
# add a default empty String, if none was given
|
|
if str
|
|
str = StringIO.new(str)
|
|
str.seek(0, IO::SEEK_END)
|
|
str.set_encoding(encoding) if encoding
|
|
else
|
|
str = +""
|
|
str.force_encoding(encoding) if encoding
|
|
end
|
|
csv = new(str, **options) # wrap
|
|
yield csv # yield for appending
|
|
csv.string # return final String
|
|
end
|
|
|
|
# :call-seq:
|
|
# CSV.generate_line(ary)
|
|
# CSV.generate_line(ary, **options)
|
|
#
|
|
# Returns the \String created by generating \CSV from +ary+
|
|
# using the specified +options+.
|
|
#
|
|
# Argument +ary+ must be an \Array.
|
|
#
|
|
# Special options:
|
|
# * Option <tt>:row_sep</tt> defaults to <tt>"\n"> on Ruby 3.0 or later
|
|
# and <tt>$INPUT_RECORD_SEPARATOR</tt> (<tt>$/</tt>) otherwise.:
|
|
# $INPUT_RECORD_SEPARATOR # => "\n"
|
|
# * This method accepts an additional option, <tt>:encoding</tt>, which sets the base
|
|
# Encoding for the output. This method will try to guess your Encoding from
|
|
# the first non-+nil+ field in +row+, if possible, but you may need to use
|
|
# this parameter as a backup plan.
|
|
#
|
|
# For other +options+,
|
|
# see {Options for Generating}[#class-CSV-label-Options+for+Generating].
|
|
#
|
|
# ---
|
|
#
|
|
# Returns the \String generated from an \Array:
|
|
# CSV.generate_line(['foo', '0']) # => "foo,0\n"
|
|
#
|
|
# ---
|
|
#
|
|
# Raises an exception if +ary+ is not an \Array:
|
|
# # Raises NoMethodError (undefined method `find' for :foo:Symbol)
|
|
# CSV.generate_line(:foo)
|
|
#
|
|
def generate_line(row, **options)
|
|
options = {row_sep: InputRecordSeparator.value}.merge(options)
|
|
str = +""
|
|
if options[:encoding]
|
|
str.force_encoding(options[:encoding])
|
|
else
|
|
fallback_encoding = nil
|
|
output_encoding = nil
|
|
row.each do |field|
|
|
next unless field.is_a?(String)
|
|
fallback_encoding ||= field.encoding
|
|
next if field.ascii_only?
|
|
output_encoding = field.encoding
|
|
break
|
|
end
|
|
output_encoding ||= fallback_encoding
|
|
if output_encoding
|
|
str.force_encoding(output_encoding)
|
|
end
|
|
end
|
|
(new(str, **options) << row).string
|
|
end
|
|
|
|
# :call-seq:
|
|
# CSV.generate_lines(rows)
|
|
# CSV.generate_lines(rows, **options)
|
|
#
|
|
# Returns the \String created by generating \CSV from
|
|
# using the specified +options+.
|
|
#
|
|
# Argument +rows+ must be an \Array of row. Row is \Array of \String or \CSV::Row.
|
|
#
|
|
# Special options:
|
|
# * Option <tt>:row_sep</tt> defaults to <tt>"\n"</tt> on Ruby 3.0 or later
|
|
# and <tt>$INPUT_RECORD_SEPARATOR</tt> (<tt>$/</tt>) otherwise.:
|
|
# $INPUT_RECORD_SEPARATOR # => "\n"
|
|
# * This method accepts an additional option, <tt>:encoding</tt>, which sets 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.
|
|
#
|
|
# For other +options+,
|
|
# see {Options for Generating}[#class-CSV-label-Options+for+Generating].
|
|
#
|
|
# ---
|
|
#
|
|
# Returns the \String generated from an
|
|
# CSV.generate_lines([['foo', '0'], ['bar', '1'], ['baz', '2']]) # => "foo,0\nbar,1\nbaz,2\n"
|
|
#
|
|
# ---
|
|
#
|
|
# Raises an exception
|
|
# # Raises NoMethodError (undefined method `each' for :foo:Symbol)
|
|
# CSV.generate_lines(:foo)
|
|
#
|
|
def generate_lines(rows, **options)
|
|
self.generate(**options) do |csv|
|
|
rows.each do |row|
|
|
csv << row
|
|
end
|
|
end
|
|
end
|
|
|
|
#
|
|
# :call-seq:
|
|
# open(file_path, mode = "rb", **options ) -> new_csv
|
|
# open(io, mode = "rb", **options ) -> new_csv
|
|
# open(file_path, mode = "rb", **options ) { |csv| ... } -> object
|
|
# open(io, mode = "rb", **options ) { |csv| ... } -> object
|
|
#
|
|
# possible options elements:
|
|
# keyword form:
|
|
# :invalid => nil # raise error on invalid byte sequence (default)
|
|
# :invalid => :replace # replace invalid byte sequence
|
|
# :undef => :replace # replace undefined conversion
|
|
# :replace => string # replacement string ("?" or "\uFFFD" if not specified)
|
|
#
|
|
# * Argument +path+, if given, must be the path to a file.
|
|
# :include: ../doc/csv/arguments/io.rdoc
|
|
# * Argument +mode+, if given, must be a \File mode
|
|
# See {Open Mode}[IO.html#method-c-new-label-Open+Mode].
|
|
# * Arguments <tt>**options</tt> must be keyword options.
|
|
# See {Options for Generating}[#class-CSV-label-Options+for+Generating].
|
|
# * This method optionally accepts an additional <tt>:encoding</tt> option
|
|
# that you can use to specify the Encoding of the data read from +path+ or +io+.
|
|
# You must provide this unless your data is in the encoding
|
|
# given by <tt>Encoding::default_external</tt>.
|
|
# Parsing 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,
|
|
# encoding: 'UTF-32BE:UTF-8'
|
|
# would read +UTF-32BE+ data from the file
|
|
# but transcode it to +UTF-8+ before parsing.
|
|
#
|
|
# ---
|
|
#
|
|
# These examples assume prior execution of:
|
|
# string = "foo,0\nbar,1\nbaz,2\n"
|
|
# path = 't.csv'
|
|
# File.write(path, string)
|
|
#
|
|
# ---
|
|
#
|
|
# With no block given, returns a new \CSV object.
|
|
#
|
|
# Create a \CSV object using a file path:
|
|
# csv = CSV.open(path)
|
|
# csv # => #<CSV io_type:File io_path:"t.csv" encoding:UTF-8 lineno:0 col_sep:"," row_sep:"\n" quote_char:"\"">
|
|
#
|
|
# Create a \CSV object using an open \File:
|
|
# csv = CSV.open(File.open(path))
|
|
# csv # => #<CSV io_type:File io_path:"t.csv" encoding:UTF-8 lineno:0 col_sep:"," row_sep:"\n" quote_char:"\"">
|
|
#
|
|
# ---
|
|
#
|
|
# With a block given, calls the block with the created \CSV object;
|
|
# returns the block's return value:
|
|
#
|
|
# Using a file path:
|
|
# csv = CSV.open(path) {|csv| p csv}
|
|
# csv # => #<CSV io_type:File io_path:"t.csv" encoding:UTF-8 lineno:0 col_sep:"," row_sep:"\n" quote_char:"\"">
|
|
# Output:
|
|
# #<CSV io_type:File io_path:"t.csv" encoding:UTF-8 lineno:0 col_sep:"," row_sep:"\n" quote_char:"\"">
|
|
#
|
|
# Using an open \File:
|
|
# csv = CSV.open(File.open(path)) {|csv| p csv}
|
|
# csv # => #<CSV io_type:File io_path:"t.csv" encoding:UTF-8 lineno:0 col_sep:"," row_sep:"\n" quote_char:"\"">
|
|
# Output:
|
|
# #<CSV io_type:File io_path:"t.csv" encoding:UTF-8 lineno:0 col_sep:"," row_sep:"\n" quote_char:"\"">
|
|
#
|
|
# ---
|
|
#
|
|
# Raises an exception if the argument is not a \String object or \IO object:
|
|
# # Raises TypeError (no implicit conversion of Symbol into String)
|
|
# CSV.open(:foo)
|
|
def open(filename, mode="r", **options)
|
|
# wrap a File opened with the remaining +args+ with no newline
|
|
# decorator
|
|
file_opts = options.dup
|
|
unless file_opts.key?(:newline)
|
|
file_opts[:universal_newline] ||= false
|
|
end
|
|
options.delete(:invalid)
|
|
options.delete(:undef)
|
|
options.delete(:replace)
|
|
options.delete_if {|k, _| /newline\z/.match?(k)}
|
|
|
|
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(string) -> array_of_arrays
|
|
# parse(io) -> array_of_arrays
|
|
# parse(string, headers: ..., **options) -> csv_table
|
|
# parse(io, headers: ..., **options) -> csv_table
|
|
# parse(string, **options) {|row| ... }
|
|
# parse(io, **options) {|row| ... }
|
|
#
|
|
# Parses +string+ or +io+ using the specified +options+.
|
|
#
|
|
# - Argument +string+ should be a \String object;
|
|
# it will be put into a new StringIO object positioned at the beginning.
|
|
# :include: ../doc/csv/arguments/io.rdoc
|
|
# - Argument +options+: see {Options for Parsing}[#class-CSV-label-Options+for+Parsing]
|
|
#
|
|
# ====== Without Option +headers+
|
|
#
|
|
# Without {option +headers+}[#class-CSV-label-Option+headers] case.
|
|
#
|
|
# These examples assume prior execution of:
|
|
# string = "foo,0\nbar,1\nbaz,2\n"
|
|
# path = 't.csv'
|
|
# File.write(path, string)
|
|
#
|
|
# ---
|
|
#
|
|
# With no block given, returns an \Array of Arrays formed from the source.
|
|
#
|
|
# Parse a \String:
|
|
# a_of_a = CSV.parse(string)
|
|
# a_of_a # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
|
|
#
|
|
# Parse an open \File:
|
|
# a_of_a = File.open(path) do |file|
|
|
# CSV.parse(file)
|
|
# end
|
|
# a_of_a # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
|
|
#
|
|
# ---
|
|
#
|
|
# With a block given, calls the block with each parsed row:
|
|
#
|
|
# Parse a \String:
|
|
# CSV.parse(string) {|row| p row }
|
|
#
|
|
# Output:
|
|
# ["foo", "0"]
|
|
# ["bar", "1"]
|
|
# ["baz", "2"]
|
|
#
|
|
# Parse an open \File:
|
|
# File.open(path) do |file|
|
|
# CSV.parse(file) {|row| p row }
|
|
# end
|
|
#
|
|
# Output:
|
|
# ["foo", "0"]
|
|
# ["bar", "1"]
|
|
# ["baz", "2"]
|
|
#
|
|
# ====== With Option +headers+
|
|
#
|
|
# With {option +headers+}[#class-CSV-label-Option+headers] case.
|
|
#
|
|
# These examples assume prior execution of:
|
|
# string = "Name,Count\nfoo,0\nbar,1\nbaz,2\n"
|
|
# path = 't.csv'
|
|
# File.write(path, string)
|
|
#
|
|
# ---
|
|
#
|
|
# With no block given, returns a CSV::Table object formed from the source.
|
|
#
|
|
# Parse a \String:
|
|
# csv_table = CSV.parse(string, headers: ['Name', 'Count'])
|
|
# csv_table # => #<CSV::Table mode:col_or_row row_count:5>
|
|
#
|
|
# Parse an open \File:
|
|
# csv_table = File.open(path) do |file|
|
|
# CSV.parse(file, headers: ['Name', 'Count'])
|
|
# end
|
|
# csv_table # => #<CSV::Table mode:col_or_row row_count:4>
|
|
#
|
|
# ---
|
|
#
|
|
# With a block given, calls the block with each parsed row,
|
|
# which has been formed into a CSV::Row object:
|
|
#
|
|
# Parse a \String:
|
|
# CSV.parse(string, headers: ['Name', 'Count']) {|row| p row }
|
|
#
|
|
# Output:
|
|
# # <CSV::Row "Name":"foo" "Count":"0">
|
|
# # <CSV::Row "Name":"bar" "Count":"1">
|
|
# # <CSV::Row "Name":"baz" "Count":"2">
|
|
#
|
|
# Parse an open \File:
|
|
# File.open(path) do |file|
|
|
# CSV.parse(file, headers: ['Name', 'Count']) {|row| p row }
|
|
# end
|
|
#
|
|
# Output:
|
|
# # <CSV::Row "Name":"foo" "Count":"0">
|
|
# # <CSV::Row "Name":"bar" "Count":"1">
|
|
# # <CSV::Row "Name":"baz" "Count":"2">
|
|
#
|
|
# ---
|
|
#
|
|
# Raises an exception if the argument is not a \String object or \IO object:
|
|
# # Raises NoMethodError (undefined method `close' for :foo:Symbol)
|
|
# CSV.parse(:foo)
|
|
def parse(str, **options, &block)
|
|
csv = new(str, **options)
|
|
|
|
return csv.each(&block) if block_given?
|
|
|
|
# slurp contents, if no block is given
|
|
begin
|
|
csv.read
|
|
ensure
|
|
csv.close
|
|
end
|
|
end
|
|
|
|
# :call-seq:
|
|
# CSV.parse_line(string) -> new_array or nil
|
|
# CSV.parse_line(io) -> new_array or nil
|
|
# CSV.parse_line(string, **options) -> new_array or nil
|
|
# CSV.parse_line(io, **options) -> new_array or nil
|
|
# CSV.parse_line(string, headers: true, **options) -> csv_row or nil
|
|
# CSV.parse_line(io, headers: true, **options) -> csv_row or nil
|
|
#
|
|
# Returns the data created by parsing the first line of +string+ or +io+
|
|
# using the specified +options+.
|
|
#
|
|
# - Argument +string+ should be a \String object;
|
|
# it will be put into a new StringIO object positioned at the beginning.
|
|
# :include: ../doc/csv/arguments/io.rdoc
|
|
# - Argument +options+: see {Options for Parsing}[#class-CSV-label-Options+for+Parsing]
|
|
#
|
|
# ====== Without Option +headers+
|
|
#
|
|
# Without option +headers+, returns the first row as a new \Array.
|
|
#
|
|
# These examples assume prior execution of:
|
|
# string = "foo,0\nbar,1\nbaz,2\n"
|
|
# path = 't.csv'
|
|
# File.write(path, string)
|
|
#
|
|
# Parse the first line from a \String object:
|
|
# CSV.parse_line(string) # => ["foo", "0"]
|
|
#
|
|
# Parse the first line from a File object:
|
|
# File.open(path) do |file|
|
|
# CSV.parse_line(file) # => ["foo", "0"]
|
|
# end # => ["foo", "0"]
|
|
#
|
|
# Returns +nil+ if the argument is an empty \String:
|
|
# CSV.parse_line('') # => nil
|
|
#
|
|
# ====== With Option +headers+
|
|
#
|
|
# With {option +headers+}[#class-CSV-label-Option+headers],
|
|
# returns the first row as a CSV::Row object.
|
|
#
|
|
# These examples assume prior execution of:
|
|
# string = "Name,Count\nfoo,0\nbar,1\nbaz,2\n"
|
|
# path = 't.csv'
|
|
# File.write(path, string)
|
|
#
|
|
# Parse the first line from a \String object:
|
|
# CSV.parse_line(string, headers: true) # => #<CSV::Row "Name":"foo" "Count":"0">
|
|
#
|
|
# Parse the first line from a File object:
|
|
# File.open(path) do |file|
|
|
# CSV.parse_line(file, headers: true)
|
|
# end # => #<CSV::Row "Name":"foo" "Count":"0">
|
|
#
|
|
# ---
|
|
#
|
|
# Raises an exception if the argument is +nil+:
|
|
# # Raises ArgumentError (Cannot parse nil as CSV):
|
|
# CSV.parse_line(nil)
|
|
#
|
|
def parse_line(line, **options)
|
|
new(line, **options).each.first
|
|
end
|
|
|
|
#
|
|
# :call-seq:
|
|
# read(source, **options) -> array_of_arrays
|
|
# read(source, headers: true, **options) -> csv_table
|
|
#
|
|
# Opens the given +source+ with the given +options+ (see CSV.open),
|
|
# reads the source (see CSV#read), and returns the result,
|
|
# which will be either an \Array of Arrays or a CSV::Table.
|
|
#
|
|
# Without headers:
|
|
# string = "foo,0\nbar,1\nbaz,2\n"
|
|
# path = 't.csv'
|
|
# File.write(path, string)
|
|
# CSV.read(path) # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
|
|
#
|
|
# With headers:
|
|
# string = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
|
|
# path = 't.csv'
|
|
# File.write(path, string)
|
|
# CSV.read(path, headers: true) # => #<CSV::Table mode:col_or_row row_count:4>
|
|
def read(path, **options)
|
|
open(path, **options) { |csv| csv.read }
|
|
end
|
|
|
|
# :call-seq:
|
|
# CSV.readlines(source, **options)
|
|
#
|
|
# Alias for CSV.read.
|
|
def readlines(path, **options)
|
|
read(path, **options)
|
|
end
|
|
|
|
# :call-seq:
|
|
# CSV.table(source, **options)
|
|
#
|
|
# Calls CSV.read with +source+, +options+, and certain default options:
|
|
# - +headers+: +true+
|
|
# - +converters+: +:numeric+
|
|
# - +header_converters+: +:symbol+
|
|
#
|
|
# Returns a CSV::Table object.
|
|
#
|
|
# Example:
|
|
# string = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
|
|
# path = 't.csv'
|
|
# File.write(path, string)
|
|
# CSV.table(path) # => #<CSV::Table mode:col_or_row row_count:4>
|
|
def table(path, **options)
|
|
default_options = {
|
|
headers: true,
|
|
converters: :numeric,
|
|
header_converters: :symbol,
|
|
}
|
|
options = default_options.merge(options)
|
|
read(path, **options)
|
|
end
|
|
end
|
|
|
|
# :call-seq:
|
|
# CSV.new(string)
|
|
# CSV.new(io)
|
|
# CSV.new(string, **options)
|
|
# CSV.new(io, **options)
|
|
#
|
|
# Returns the new \CSV object created using +string+ or +io+
|
|
# and the specified +options+.
|
|
#
|
|
# - Argument +string+ should be a \String object;
|
|
# it will be put into a new StringIO object positioned at the beginning.
|
|
# :include: ../doc/csv/arguments/io.rdoc
|
|
# - Argument +options+: See:
|
|
# * {Options for Parsing}[#class-CSV-label-Options+for+Parsing]
|
|
# * {Options for Generating}[#class-CSV-label-Options+for+Generating]
|
|
# For performance reasons, the options cannot be overridden
|
|
# in a \CSV object, so those specified here will endure.
|
|
#
|
|
# In addition to the \CSV instance methods, several \IO methods are delegated.
|
|
# See {Delegated Methods}[#class-CSV-label-Delegated+Methods].
|
|
#
|
|
# ---
|
|
#
|
|
# Create a \CSV object from a \String object:
|
|
# csv = CSV.new('foo,0')
|
|
# csv # => #<CSV io_type:StringIO encoding:UTF-8 lineno:0 col_sep:"," row_sep:"\n" quote_char:"\"">
|
|
#
|
|
# Create a \CSV object from a \File object:
|
|
# File.write('t.csv', 'foo,0')
|
|
# csv = CSV.new(File.open('t.csv'))
|
|
# csv # => #<CSV io_type:File io_path:"t.csv" encoding:UTF-8 lineno:0 col_sep:"," row_sep:"\n" quote_char:"\"">
|
|
#
|
|
# ---
|
|
#
|
|
# Raises an exception if the argument is +nil+:
|
|
# # Raises ArgumentError (Cannot parse nil as CSV):
|
|
# CSV.new(nil)
|
|
#
|
|
def initialize(data,
|
|
col_sep: ",",
|
|
row_sep: :auto,
|
|
quote_char: '"',
|
|
field_size_limit: nil,
|
|
max_field_size: 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: "",
|
|
strip: false,
|
|
quote_empty: true,
|
|
write_converters: nil,
|
|
write_nil_value: nil,
|
|
write_empty_value: "")
|
|
raise ArgumentError.new("Cannot parse nil as CSV") if data.nil?
|
|
|
|
if data.is_a?(String)
|
|
if encoding
|
|
if encoding.is_a?(String)
|
|
data_external_encoding, data_internal_encoding = encoding.split(":", 2)
|
|
if data_internal_encoding
|
|
data = data.encode(data_internal_encoding, data_external_encoding)
|
|
else
|
|
data = data.dup.force_encoding(data_external_encoding)
|
|
end
|
|
else
|
|
data = data.dup.force_encoding(encoding)
|
|
end
|
|
end
|
|
@io = StringIO.new(data)
|
|
else
|
|
@io = data
|
|
end
|
|
@encoding = determine_encoding(encoding, internal_encoding)
|
|
|
|
@base_fields_converter_options = {
|
|
nil_value: nil_value,
|
|
empty_value: empty_value,
|
|
}
|
|
@write_fields_converter_options = {
|
|
nil_value: write_nil_value,
|
|
empty_value: write_empty_value,
|
|
}
|
|
@initial_converters = converters
|
|
@initial_header_converters = header_converters
|
|
@initial_write_converters = write_converters
|
|
|
|
if max_field_size.nil? and field_size_limit
|
|
max_field_size = field_size_limit - 1
|
|
end
|
|
@parser_options = {
|
|
column_separator: col_sep,
|
|
row_separator: row_sep,
|
|
quote_character: quote_char,
|
|
max_field_size: max_field_size,
|
|
unconverted_fields: unconverted_fields,
|
|
headers: headers,
|
|
return_headers: return_headers,
|
|
skip_blanks: skip_blanks,
|
|
skip_lines: skip_lines,
|
|
liberal_parsing: liberal_parsing,
|
|
encoding: @encoding,
|
|
nil_value: nil_value,
|
|
empty_value: empty_value,
|
|
strip: strip,
|
|
}
|
|
@parser = nil
|
|
@parser_enumerator = nil
|
|
@eof_error = nil
|
|
|
|
@writer_options = {
|
|
encoding: @encoding,
|
|
force_encoding: (not encoding.nil?),
|
|
force_quotes: force_quotes,
|
|
headers: headers,
|
|
write_headers: write_headers,
|
|
column_separator: col_sep,
|
|
row_separator: row_sep,
|
|
quote_character: quote_char,
|
|
quote_empty: quote_empty,
|
|
}
|
|
|
|
@writer = nil
|
|
writer if @writer_options[:write_headers]
|
|
end
|
|
|
|
# :call-seq:
|
|
# csv.col_sep -> string
|
|
#
|
|
# Returns the encoded column separator; used for parsing and writing;
|
|
# see {Option +col_sep+}[#class-CSV-label-Option+col_sep]:
|
|
# CSV.new('').col_sep # => ","
|
|
def col_sep
|
|
parser.column_separator
|
|
end
|
|
|
|
# :call-seq:
|
|
# csv.row_sep -> string
|
|
#
|
|
# Returns the encoded row separator; used for parsing and writing;
|
|
# see {Option +row_sep+}[#class-CSV-label-Option+row_sep]:
|
|
# CSV.new('').row_sep # => "\n"
|
|
def row_sep
|
|
parser.row_separator
|
|
end
|
|
|
|
# :call-seq:
|
|
# csv.quote_char -> character
|
|
#
|
|
# Returns the encoded quote character; used for parsing and writing;
|
|
# see {Option +quote_char+}[#class-CSV-label-Option+quote_char]:
|
|
# CSV.new('').quote_char # => "\""
|
|
def quote_char
|
|
parser.quote_character
|
|
end
|
|
|
|
# :call-seq:
|
|
# csv.field_size_limit -> integer or nil
|
|
#
|
|
# Returns the limit for field size; used for parsing;
|
|
# see {Option +field_size_limit+}[#class-CSV-label-Option+field_size_limit]:
|
|
# CSV.new('').field_size_limit # => nil
|
|
#
|
|
# Deprecated since 3.2.3. Use +max_field_size+ instead.
|
|
def field_size_limit
|
|
parser.field_size_limit
|
|
end
|
|
|
|
# :call-seq:
|
|
# csv.max_field_size -> integer or nil
|
|
#
|
|
# Returns the limit for field size; used for parsing;
|
|
# see {Option +max_field_size+}[#class-CSV-label-Option+max_field_size]:
|
|
# CSV.new('').max_field_size # => nil
|
|
#
|
|
# Since 3.2.3.
|
|
def max_field_size
|
|
parser.max_field_size
|
|
end
|
|
|
|
# :call-seq:
|
|
# csv.skip_lines -> regexp or nil
|
|
#
|
|
# Returns the \Regexp used to identify comment lines; used for parsing;
|
|
# see {Option +skip_lines+}[#class-CSV-label-Option+skip_lines]:
|
|
# CSV.new('').skip_lines # => nil
|
|
def skip_lines
|
|
parser.skip_lines
|
|
end
|
|
|
|
# :call-seq:
|
|
# csv.converters -> array
|
|
#
|
|
# Returns an \Array containing field converters;
|
|
# see {Field Converters}[#class-CSV-label-Field+Converters]:
|
|
# csv = CSV.new('')
|
|
# csv.converters # => []
|
|
# csv.convert(:integer)
|
|
# csv.converters # => [:integer]
|
|
# csv.convert(proc {|x| x.to_s })
|
|
# csv.converters
|
|
#
|
|
# Notes that you need to call
|
|
# +Ractor.make_shareable(CSV::Converters)+ on the main Ractor to use
|
|
# this method.
|
|
def converters
|
|
parser_fields_converter.map do |converter|
|
|
name = Converters.rassoc(converter)
|
|
name ? name.first : converter
|
|
end
|
|
end
|
|
|
|
# :call-seq:
|
|
# csv.unconverted_fields? -> object
|
|
#
|
|
# Returns the value that determines whether unconverted fields are to be
|
|
# available; used for parsing;
|
|
# see {Option +unconverted_fields+}[#class-CSV-label-Option+unconverted_fields]:
|
|
# CSV.new('').unconverted_fields? # => nil
|
|
def unconverted_fields?
|
|
parser.unconverted_fields?
|
|
end
|
|
|
|
# :call-seq:
|
|
# csv.headers -> object
|
|
#
|
|
# Returns the value that determines whether headers are used; used for parsing;
|
|
# see {Option +headers+}[#class-CSV-label-Option+headers]:
|
|
# CSV.new('').headers # => nil
|
|
def headers
|
|
if @writer
|
|
@writer.headers
|
|
else
|
|
parsed_headers = parser.headers
|
|
return parsed_headers if parsed_headers
|
|
raw_headers = @parser_options[:headers]
|
|
raw_headers = nil if raw_headers == false
|
|
raw_headers
|
|
end
|
|
end
|
|
|
|
# :call-seq:
|
|
# csv.return_headers? -> true or false
|
|
#
|
|
# Returns the value that determines whether headers are to be returned; used for parsing;
|
|
# see {Option +return_headers+}[#class-CSV-label-Option+return_headers]:
|
|
# CSV.new('').return_headers? # => false
|
|
def return_headers?
|
|
parser.return_headers?
|
|
end
|
|
|
|
# :call-seq:
|
|
# csv.write_headers? -> true or false
|
|
#
|
|
# Returns the value that determines whether headers are to be written; used for generating;
|
|
# see {Option +write_headers+}[#class-CSV-label-Option+write_headers]:
|
|
# CSV.new('').write_headers? # => nil
|
|
def write_headers?
|
|
@writer_options[:write_headers]
|
|
end
|
|
|
|
# :call-seq:
|
|
# csv.header_converters -> array
|
|
#
|
|
# Returns an \Array containing header converters; used for parsing;
|
|
# see {Header Converters}[#class-CSV-label-Header+Converters]:
|
|
# CSV.new('').header_converters # => []
|
|
#
|
|
# Notes that you need to call
|
|
# +Ractor.make_shareable(CSV::HeaderConverters)+ on the main Ractor
|
|
# to use this method.
|
|
def header_converters
|
|
header_fields_converter.map do |converter|
|
|
name = HeaderConverters.rassoc(converter)
|
|
name ? name.first : converter
|
|
end
|
|
end
|
|
|
|
# :call-seq:
|
|
# csv.skip_blanks? -> true or false
|
|
#
|
|
# Returns the value that determines whether blank lines are to be ignored; used for parsing;
|
|
# see {Option +skip_blanks+}[#class-CSV-label-Option+skip_blanks]:
|
|
# CSV.new('').skip_blanks? # => false
|
|
def skip_blanks?
|
|
parser.skip_blanks?
|
|
end
|
|
|
|
# :call-seq:
|
|
# csv.force_quotes? -> true or false
|
|
#
|
|
# Returns the value that determines whether all output fields are to be quoted;
|
|
# used for generating;
|
|
# see {Option +force_quotes+}[#class-CSV-label-Option+force_quotes]:
|
|
# CSV.new('').force_quotes? # => false
|
|
def force_quotes?
|
|
@writer_options[:force_quotes]
|
|
end
|
|
|
|
# :call-seq:
|
|
# csv.liberal_parsing? -> true or false
|
|
#
|
|
# Returns the value that determines whether illegal input is to be handled; used for parsing;
|
|
# see {Option +liberal_parsing+}[#class-CSV-label-Option+liberal_parsing]:
|
|
# CSV.new('').liberal_parsing? # => false
|
|
def liberal_parsing?
|
|
parser.liberal_parsing?
|
|
end
|
|
|
|
# :call-seq:
|
|
# csv.encoding -> encoding
|
|
#
|
|
# Returns the encoding used for parsing and generating;
|
|
# see {Character Encodings (M17n or Multilingualization)}[#class-CSV-label-Character+Encodings+-28M17n+or+Multilingualization-29]:
|
|
# CSV.new('').encoding # => #<Encoding:UTF-8>
|
|
attr_reader :encoding
|
|
|
|
# :call-seq:
|
|
# csv.line_no -> integer
|
|
#
|
|
# Returns the count of the rows parsed or generated.
|
|
#
|
|
# Parsing:
|
|
# string = "foo,0\nbar,1\nbaz,2\n"
|
|
# path = 't.csv'
|
|
# File.write(path, string)
|
|
# CSV.open(path) do |csv|
|
|
# csv.each do |row|
|
|
# p [csv.lineno, row]
|
|
# end
|
|
# end
|
|
# Output:
|
|
# [1, ["foo", "0"]]
|
|
# [2, ["bar", "1"]]
|
|
# [3, ["baz", "2"]]
|
|
#
|
|
# Generating:
|
|
# CSV.generate do |csv|
|
|
# p csv.lineno; csv << ['foo', 0]
|
|
# p csv.lineno; csv << ['bar', 1]
|
|
# p csv.lineno; csv << ['baz', 2]
|
|
# end
|
|
# Output:
|
|
# 0
|
|
# 1
|
|
# 2
|
|
def lineno
|
|
if @writer
|
|
@writer.lineno
|
|
else
|
|
parser.lineno
|
|
end
|
|
end
|
|
|
|
# :call-seq:
|
|
# csv.line -> array
|
|
#
|
|
# Returns the line most recently read:
|
|
# string = "foo,0\nbar,1\nbaz,2\n"
|
|
# path = 't.csv'
|
|
# File.write(path, string)
|
|
# CSV.open(path) do |csv|
|
|
# csv.each do |row|
|
|
# p [csv.lineno, csv.line]
|
|
# end
|
|
# end
|
|
# Output:
|
|
# [1, "foo,0\n"]
|
|
# [2, "bar,1\n"]
|
|
# [3, "baz,2\n"]
|
|
def line
|
|
parser.line
|
|
end
|
|
|
|
### IO and StringIO Delegation ###
|
|
|
|
extend Forwardable
|
|
def_delegators :@io, :binmode, :close, :close_read, :close_write,
|
|
:closed?, :external_encoding, :fcntl,
|
|
:fileno, :flush, :fsync, :internal_encoding,
|
|
:isatty, :pid, :pos, :pos=, :reopen,
|
|
:seek, :string, :sync, :sync=, :tell,
|
|
:truncate, :tty?
|
|
|
|
def binmode?
|
|
if @io.respond_to?(:binmode?)
|
|
@io.binmode?
|
|
else
|
|
false
|
|
end
|
|
end
|
|
|
|
def flock(*args)
|
|
raise NotImplementedError unless @io.respond_to?(:flock)
|
|
@io.flock(*args)
|
|
end
|
|
|
|
def ioctl(*args)
|
|
raise NotImplementedError unless @io.respond_to?(:ioctl)
|
|
@io.ioctl(*args)
|
|
end
|
|
|
|
def path
|
|
@io.path if @io.respond_to?(:path)
|
|
end
|
|
|
|
def stat(*args)
|
|
raise NotImplementedError unless @io.respond_to?(:stat)
|
|
@io.stat(*args)
|
|
end
|
|
|
|
def to_i
|
|
raise NotImplementedError unless @io.respond_to?(:to_i)
|
|
@io.to_i
|
|
end
|
|
|
|
def to_io
|
|
@io.respond_to?(:to_io) ? @io.to_io : @io
|
|
end
|
|
|
|
def eof?
|
|
return false if @eof_error
|
|
begin
|
|
parser_enumerator.peek
|
|
false
|
|
rescue MalformedCSVError => error
|
|
@eof_error = error
|
|
false
|
|
rescue StopIteration
|
|
true
|
|
end
|
|
end
|
|
alias_method :eof, :eof?
|
|
|
|
# Rewinds the underlying IO object and resets CSV's lineno() counter.
|
|
def rewind
|
|
@parser = nil
|
|
@parser_enumerator = nil
|
|
@eof_error = nil
|
|
@writer.rewind if @writer
|
|
@io.rewind
|
|
end
|
|
|
|
### End Delegation ###
|
|
|
|
# :call-seq:
|
|
# csv << row -> self
|
|
#
|
|
# Appends a row to +self+.
|
|
#
|
|
# - Argument +row+ must be an \Array object or a CSV::Row object.
|
|
# - The output stream must be open for writing.
|
|
#
|
|
# ---
|
|
#
|
|
# Append Arrays:
|
|
# CSV.generate do |csv|
|
|
# csv << ['foo', 0]
|
|
# csv << ['bar', 1]
|
|
# csv << ['baz', 2]
|
|
# end # => "foo,0\nbar,1\nbaz,2\n"
|
|
#
|
|
# Append CSV::Rows:
|
|
# headers = []
|
|
# CSV.generate do |csv|
|
|
# csv << CSV::Row.new(headers, ['foo', 0])
|
|
# csv << CSV::Row.new(headers, ['bar', 1])
|
|
# csv << CSV::Row.new(headers, ['baz', 2])
|
|
# end # => "foo,0\nbar,1\nbaz,2\n"
|
|
#
|
|
# Headers in CSV::Row objects are not appended:
|
|
# headers = ['Name', 'Count']
|
|
# CSV.generate do |csv|
|
|
# csv << CSV::Row.new(headers, ['foo', 0])
|
|
# csv << CSV::Row.new(headers, ['bar', 1])
|
|
# csv << CSV::Row.new(headers, ['baz', 2])
|
|
# end # => "foo,0\nbar,1\nbaz,2\n"
|
|
#
|
|
# ---
|
|
#
|
|
# Raises an exception if +row+ is not an \Array or \CSV::Row:
|
|
# CSV.generate do |csv|
|
|
# # Raises NoMethodError (undefined method `collect' for :foo:Symbol)
|
|
# csv << :foo
|
|
# end
|
|
#
|
|
# Raises an exception if the output stream is not opened for writing:
|
|
# path = 't.csv'
|
|
# File.write(path, '')
|
|
# File.open(path) do |file|
|
|
# CSV.open(file) do |csv|
|
|
# # Raises IOError (not opened for writing)
|
|
# csv << ['foo', 0]
|
|
# end
|
|
# end
|
|
def <<(row)
|
|
writer << row
|
|
self
|
|
end
|
|
alias_method :add_row, :<<
|
|
alias_method :puts, :<<
|
|
|
|
# :call-seq:
|
|
# convert(converter_name) -> array_of_procs
|
|
# convert {|field, field_info| ... } -> array_of_procs
|
|
#
|
|
# - With no block, installs a field converter (a \Proc).
|
|
# - With a block, defines and installs a custom field converter.
|
|
# - Returns the \Array of installed field converters.
|
|
#
|
|
# - Argument +converter_name+, if given, should be the name
|
|
# of an existing field converter.
|
|
#
|
|
# See {Field Converters}[#class-CSV-label-Field+Converters].
|
|
# ---
|
|
#
|
|
# With no block, installs a field converter:
|
|
# csv = CSV.new('')
|
|
# csv.convert(:integer)
|
|
# csv.convert(:float)
|
|
# csv.convert(:date)
|
|
# csv.converters # => [:integer, :float, :date]
|
|
#
|
|
# ---
|
|
#
|
|
# The block, if given, is called for each field:
|
|
# - Argument +field+ is the field value.
|
|
# - Argument +field_info+ is a CSV::FieldInfo object
|
|
# containing details about the field.
|
|
#
|
|
# The examples here assume the prior execution of:
|
|
# string = "foo,0\nbar,1\nbaz,2\n"
|
|
# path = 't.csv'
|
|
# File.write(path, string)
|
|
#
|
|
# Example giving a block:
|
|
# csv = CSV.open(path)
|
|
# csv.convert {|field, field_info| p [field, field_info]; field.upcase }
|
|
# csv.read # => [["FOO", "0"], ["BAR", "1"], ["BAZ", "2"]]
|
|
#
|
|
# Output:
|
|
# ["foo", #<struct CSV::FieldInfo index=0, line=1, header=nil>]
|
|
# ["0", #<struct CSV::FieldInfo index=1, line=1, header=nil>]
|
|
# ["bar", #<struct CSV::FieldInfo index=0, line=2, header=nil>]
|
|
# ["1", #<struct CSV::FieldInfo index=1, line=2, header=nil>]
|
|
# ["baz", #<struct CSV::FieldInfo index=0, line=3, header=nil>]
|
|
# ["2", #<struct CSV::FieldInfo index=1, line=3, header=nil>]
|
|
#
|
|
# The block need not return a \String object:
|
|
# csv = CSV.open(path)
|
|
# csv.convert {|field, field_info| field.to_sym }
|
|
# csv.read # => [[:foo, :"0"], [:bar, :"1"], [:baz, :"2"]]
|
|
#
|
|
# If +converter_name+ is given, the block is not called:
|
|
# csv = CSV.open(path)
|
|
# csv.convert(:integer) {|field, field_info| fail 'Cannot happen' }
|
|
# csv.read # => [["foo", 0], ["bar", 1], ["baz", 2]]
|
|
#
|
|
# ---
|
|
#
|
|
# Raises a parse-time exception if +converter_name+ is not the name of a built-in
|
|
# field converter:
|
|
# csv = CSV.open(path)
|
|
# csv.convert(:nosuch) => [nil]
|
|
# # Raises NoMethodError (undefined method `arity' for nil:NilClass)
|
|
# csv.read
|
|
def convert(name = nil, &converter)
|
|
parser_fields_converter.add_converter(name, &converter)
|
|
end
|
|
|
|
# :call-seq:
|
|
# header_convert(converter_name) -> array_of_procs
|
|
# header_convert {|header, field_info| ... } -> array_of_procs
|
|
#
|
|
# - With no block, installs a header converter (a \Proc).
|
|
# - With a block, defines and installs a custom header converter.
|
|
# - Returns the \Array of installed header converters.
|
|
#
|
|
# - Argument +converter_name+, if given, should be the name
|
|
# of an existing header converter.
|
|
#
|
|
# See {Header Converters}[#class-CSV-label-Header+Converters].
|
|
# ---
|
|
#
|
|
# With no block, installs a header converter:
|
|
# csv = CSV.new('')
|
|
# csv.header_convert(:symbol)
|
|
# csv.header_convert(:downcase)
|
|
# csv.header_converters # => [:symbol, :downcase]
|
|
#
|
|
# ---
|
|
#
|
|
# The block, if given, is called for each header:
|
|
# - Argument +header+ is the header value.
|
|
# - Argument +field_info+ is a CSV::FieldInfo object
|
|
# containing details about the header.
|
|
#
|
|
# The examples here assume the prior execution of:
|
|
# string = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
|
|
# path = 't.csv'
|
|
# File.write(path, string)
|
|
#
|
|
# Example giving a block:
|
|
# csv = CSV.open(path, headers: true)
|
|
# csv.header_convert {|header, field_info| p [header, field_info]; header.upcase }
|
|
# table = csv.read
|
|
# table # => #<CSV::Table mode:col_or_row row_count:4>
|
|
# table.headers # => ["NAME", "VALUE"]
|
|
#
|
|
# Output:
|
|
# ["Name", #<struct CSV::FieldInfo index=0, line=1, header=nil>]
|
|
# ["Value", #<struct CSV::FieldInfo index=1, line=1, header=nil>]
|
|
|
|
# The block need not return a \String object:
|
|
# csv = CSV.open(path, headers: true)
|
|
# csv.header_convert {|header, field_info| header.to_sym }
|
|
# table = csv.read
|
|
# table.headers # => [:Name, :Value]
|
|
#
|
|
# If +converter_name+ is given, the block is not called:
|
|
# csv = CSV.open(path, headers: true)
|
|
# csv.header_convert(:downcase) {|header, field_info| fail 'Cannot happen' }
|
|
# table = csv.read
|
|
# table.headers # => ["name", "value"]
|
|
# ---
|
|
#
|
|
# Raises a parse-time exception if +converter_name+ is not the name of a built-in
|
|
# field converter:
|
|
# csv = CSV.open(path, headers: true)
|
|
# csv.header_convert(:nosuch)
|
|
# # Raises NoMethodError (undefined method `arity' for nil:NilClass)
|
|
# csv.read
|
|
def header_convert(name = nil, &converter)
|
|
header_fields_converter.add_converter(name, &converter)
|
|
end
|
|
|
|
include Enumerable
|
|
|
|
# :call-seq:
|
|
# csv.each -> enumerator
|
|
# csv.each {|row| ...}
|
|
#
|
|
# Calls the block with each successive row.
|
|
# The data source must be opened for reading.
|
|
#
|
|
# Without headers:
|
|
# string = "foo,0\nbar,1\nbaz,2\n"
|
|
# csv = CSV.new(string)
|
|
# csv.each do |row|
|
|
# p row
|
|
# end
|
|
# Output:
|
|
# ["foo", "0"]
|
|
# ["bar", "1"]
|
|
# ["baz", "2"]
|
|
#
|
|
# With headers:
|
|
# string = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
|
|
# csv = CSV.new(string, headers: true)
|
|
# csv.each do |row|
|
|
# p row
|
|
# end
|
|
# Output:
|
|
# <CSV::Row "Name":"foo" "Value":"0">
|
|
# <CSV::Row "Name":"bar" "Value":"1">
|
|
# <CSV::Row "Name":"baz" "Value":"2">
|
|
#
|
|
# ---
|
|
#
|
|
# Raises an exception if the source is not opened for reading:
|
|
# string = "foo,0\nbar,1\nbaz,2\n"
|
|
# csv = CSV.new(string)
|
|
# csv.close
|
|
# # Raises IOError (not opened for reading)
|
|
# csv.each do |row|
|
|
# p row
|
|
# end
|
|
def each(&block)
|
|
return to_enum(__method__) unless block_given?
|
|
begin
|
|
while true
|
|
yield(parser_enumerator.next)
|
|
end
|
|
rescue StopIteration
|
|
end
|
|
end
|
|
|
|
# :call-seq:
|
|
# csv.read -> array or csv_table
|
|
#
|
|
# Forms the remaining rows from +self+ into:
|
|
# - A CSV::Table object, if headers are in use.
|
|
# - An \Array of Arrays, otherwise.
|
|
#
|
|
# The data source must be opened for reading.
|
|
#
|
|
# Without headers:
|
|
# string = "foo,0\nbar,1\nbaz,2\n"
|
|
# path = 't.csv'
|
|
# File.write(path, string)
|
|
# csv = CSV.open(path)
|
|
# csv.read # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
|
|
#
|
|
# With headers:
|
|
# string = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
|
|
# path = 't.csv'
|
|
# File.write(path, string)
|
|
# csv = CSV.open(path, headers: true)
|
|
# csv.read # => #<CSV::Table mode:col_or_row row_count:4>
|
|
#
|
|
# ---
|
|
#
|
|
# Raises an exception if the source is not opened for reading:
|
|
# string = "foo,0\nbar,1\nbaz,2\n"
|
|
# csv = CSV.new(string)
|
|
# csv.close
|
|
# # Raises IOError (not opened for reading)
|
|
# csv.read
|
|
def read
|
|
rows = to_a
|
|
if parser.use_headers?
|
|
Table.new(rows, headers: parser.headers)
|
|
else
|
|
rows
|
|
end
|
|
end
|
|
alias_method :readlines, :read
|
|
|
|
# :call-seq:
|
|
# csv.header_row? -> true or false
|
|
#
|
|
# Returns +true+ if the next row to be read is a header row\;
|
|
# +false+ otherwise.
|
|
#
|
|
# Without headers:
|
|
# string = "foo,0\nbar,1\nbaz,2\n"
|
|
# csv = CSV.new(string)
|
|
# csv.header_row? # => false
|
|
#
|
|
# With headers:
|
|
# string = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
|
|
# csv = CSV.new(string, headers: true)
|
|
# csv.header_row? # => true
|
|
# csv.shift # => #<CSV::Row "Name":"foo" "Value":"0">
|
|
# csv.header_row? # => false
|
|
#
|
|
# ---
|
|
#
|
|
# Raises an exception if the source is not opened for reading:
|
|
# string = "foo,0\nbar,1\nbaz,2\n"
|
|
# csv = CSV.new(string)
|
|
# csv.close
|
|
# # Raises IOError (not opened for reading)
|
|
# csv.header_row?
|
|
def header_row?
|
|
parser.header_row?
|
|
end
|
|
|
|
# :call-seq:
|
|
# csv.shift -> array, csv_row, or nil
|
|
#
|
|
# Returns the next row of data as:
|
|
# - An \Array if no headers are used.
|
|
# - A CSV::Row object if headers are used.
|
|
#
|
|
# The data source must be opened for reading.
|
|
#
|
|
# Without headers:
|
|
# string = "foo,0\nbar,1\nbaz,2\n"
|
|
# csv = CSV.new(string)
|
|
# csv.shift # => ["foo", "0"]
|
|
# csv.shift # => ["bar", "1"]
|
|
# csv.shift # => ["baz", "2"]
|
|
# csv.shift # => nil
|
|
#
|
|
# With headers:
|
|
# string = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
|
|
# csv = CSV.new(string, headers: true)
|
|
# csv.shift # => #<CSV::Row "Name":"foo" "Value":"0">
|
|
# csv.shift # => #<CSV::Row "Name":"bar" "Value":"1">
|
|
# csv.shift # => #<CSV::Row "Name":"baz" "Value":"2">
|
|
# csv.shift # => nil
|
|
#
|
|
# ---
|
|
#
|
|
# Raises an exception if the source is not opened for reading:
|
|
# string = "foo,0\nbar,1\nbaz,2\n"
|
|
# csv = CSV.new(string)
|
|
# csv.close
|
|
# # Raises IOError (not opened for reading)
|
|
# csv.shift
|
|
def shift
|
|
if @eof_error
|
|
eof_error, @eof_error = @eof_error, nil
|
|
raise eof_error
|
|
end
|
|
begin
|
|
parser_enumerator.next
|
|
rescue StopIteration
|
|
nil
|
|
end
|
|
end
|
|
alias_method :gets, :shift
|
|
alias_method :readline, :shift
|
|
|
|
# :call-seq:
|
|
# csv.inspect -> string
|
|
#
|
|
# Returns a \String showing certain properties of +self+:
|
|
# string = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
|
|
# csv = CSV.new(string, headers: true)
|
|
# s = csv.inspect
|
|
# s # => "#<CSV io_type:StringIO encoding:UTF-8 lineno:0 col_sep:\",\" row_sep:\"\\n\" quote_char:\"\\\"\" headers:true>"
|
|
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
|
|
["lineno", "col_sep", "row_sep", "quote_char"].each do |attr_name|
|
|
if a = __send__(attr_name)
|
|
str << " " << attr_name << ":" << a.inspect
|
|
end
|
|
end
|
|
["skip_blanks", "liberal_parsing"].each do |attr_name|
|
|
if a = __send__("#{attr_name}?")
|
|
str << " " << attr_name << ":" << a.inspect
|
|
end
|
|
end
|
|
_headers = headers
|
|
str << " headers:" << _headers.inspect if _headers
|
|
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
|
|
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
|
|
|
|
def normalize_converters(converters)
|
|
converters ||= []
|
|
unless converters.is_a?(Array)
|
|
converters = [converters]
|
|
end
|
|
converters.collect do |converter|
|
|
case converter
|
|
when Proc # custom code block
|
|
[nil, converter]
|
|
else # by name
|
|
[converter, nil]
|
|
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
|
|
header_fields_converter.convert(fields, nil, 0)
|
|
else
|
|
parser_fields_converter.convert(fields, @headers, lineno)
|
|
end
|
|
end
|
|
|
|
#
|
|
# Returns the encoding of the internal IO object.
|
|
#
|
|
def raw_encoding
|
|
if @io.respond_to? :internal_encoding
|
|
@io.internal_encoding || @io.external_encoding
|
|
elsif @io.respond_to? :encoding
|
|
@io.encoding
|
|
else
|
|
nil
|
|
end
|
|
end
|
|
|
|
def parser_fields_converter
|
|
@parser_fields_converter ||= build_parser_fields_converter
|
|
end
|
|
|
|
def build_parser_fields_converter
|
|
specific_options = {
|
|
builtin_converters_name: :Converters,
|
|
}
|
|
options = @base_fields_converter_options.merge(specific_options)
|
|
build_fields_converter(@initial_converters, options)
|
|
end
|
|
|
|
def header_fields_converter
|
|
@header_fields_converter ||= build_header_fields_converter
|
|
end
|
|
|
|
def build_header_fields_converter
|
|
specific_options = {
|
|
builtin_converters_name: :HeaderConverters,
|
|
accept_nil: true,
|
|
}
|
|
options = @base_fields_converter_options.merge(specific_options)
|
|
build_fields_converter(@initial_header_converters, options)
|
|
end
|
|
|
|
def writer_fields_converter
|
|
@writer_fields_converter ||= build_writer_fields_converter
|
|
end
|
|
|
|
def build_writer_fields_converter
|
|
build_fields_converter(@initial_write_converters,
|
|
@write_fields_converter_options)
|
|
end
|
|
|
|
def build_fields_converter(initial_converters, options)
|
|
fields_converter = FieldsConverter.new(options)
|
|
normalize_converters(initial_converters).each do |name, converter|
|
|
fields_converter.add_converter(name, &converter)
|
|
end
|
|
fields_converter
|
|
end
|
|
|
|
def parser
|
|
@parser ||= Parser.new(@io, parser_options)
|
|
end
|
|
|
|
def parser_options
|
|
@parser_options.merge(header_fields_converter: header_fields_converter,
|
|
fields_converter: parser_fields_converter)
|
|
end
|
|
|
|
def parser_enumerator
|
|
@parser_enumerator ||= parser.parse
|
|
end
|
|
|
|
def writer
|
|
@writer ||= Writer.new(@io, writer_options)
|
|
end
|
|
|
|
def writer_options
|
|
@writer_options.merge(header_fields_converter: header_fields_converter,
|
|
fields_converter: writer_fields_converter)
|
|
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
|
|
#
|
|
# CSV options may also be given.
|
|
#
|
|
# io = StringIO.new
|
|
# CSV(io, col_sep: ";") { |csv| csv << ["a", "b", "c"] }
|
|
#
|
|
# This API is not Ractor-safe.
|
|
#
|
|
def CSV(*args, **options, &block)
|
|
CSV.instance(*args, **options, &block)
|
|
end
|
|
|
|
require_relative "csv/version"
|
|
require_relative "csv/core_ext/array"
|
|
require_relative "csv/core_ext/string"
|