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封裝 MIME 類型的概念。可以在渲染時使用，例如，使用

class PostsController < ActionController::Base
  def show
    @post = Post.find(params[:id])

    respond_to do |format|
      format.html
      format.ics { render body: @post.to_ics, mime_type: Mime::Type.lookup("text/calendar")  }
      format.xml { render xml: @post }
    end
  end
end
命名空間
方法
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常數

ACCEPT_HEADER_REGEXP = /[^,\s"](?:[^,"]|"[^"]*")*/
 
MIME_NAME = "[a-zA-Z0-9][a-zA-Z0-9#{Regexp.escape('!#$&-^_.+')}]{0,126}"
 
MIME_PARAMETER = "\s*;\s*#{MIME_NAME}(?:=#{MIME_PARAMETER_VALUE})?"
 
MIME_PARAMETER_VALUE = "(?:#{MIME_NAME}|\"[^\"\r\\\\]*\")"
 
MIME_REGEXP = /\A(?:\*\/\*|#{MIME_NAME}\/(?:\*|#{MIME_NAME})(?>#{MIME_PARAMETER})*\s*)\z/
 
PARAMETER_SEPARATOR_REGEXP = /;\s*q="?/
 

所有媒體類型參數必須在 q 參數之前 www.rfc-editor.org/rfc/rfc7231#section-5.3.2
TRAILING_STAR_REGEXP = /^(text|application)\/\*/
 

屬性

[R] hash
[R] string
[R] symbol
[R] synonyms

類別公開方法

lookup(string)

來源：顯示 | 在 GitHub 上 

# File actionpack/lib/action_dispatch/http/mime_type.rb, line 164
def lookup(string)
  # fallback to the media-type without parameters if it was not found
  LOOKUP[string] || LOOKUP[string.split(";", 2)[0]&.rstrip] || Type.new(string)
end

lookup_by_extension(extension)

來源：顯示 | 在 GitHub 上 

# File actionpack/lib/action_dispatch/http/mime_type.rb, line 169
def lookup_by_extension(extension)
  EXTENSION_LOOKUP[extension.to_s]
end

new(string, symbol = nil, synonyms = [])

來源：顯示 | 在 GitHub 上 

# File actionpack/lib/action_dispatch/http/mime_type.rb, line 257
def initialize(string, symbol = nil, synonyms = [])
  unless MIME_REGEXP.match?(string)
    raise InvalidMimeType, "#{string.inspect} is not a valid MIME type"
  end
  @symbol, @synonyms = symbol, synonyms
  @string = string
  @hash = [@string, @synonyms, @symbol].hash
end

parse(accept_header)

來源：顯示 | 在 GitHub 上 

# File actionpack/lib/action_dispatch/http/mime_type.rb, line 193
def parse(accept_header)
  if !accept_header.include?(",")
    if (index = accept_header.index(PARAMETER_SEPARATOR_REGEXP))
      accept_header = accept_header[0, index].strip
    end
    return [] if accept_header.blank?
    parse_trailing_star(accept_header) || Array(Mime::Type.lookup(accept_header))
  else
    list, index = [], 0
    accept_header.scan(ACCEPT_HEADER_REGEXP).each do |header|
      params, q = header.split(PARAMETER_SEPARATOR_REGEXP)

      next unless params
      params.strip!
      next if params.empty?

      params = parse_trailing_star(params) || [params]

      params.each do |m|
        list << AcceptItem.new(index, m.to_s, q)
        index += 1
      end
    end
    AcceptList.sort! list
  end
end

parse_data_with_trailing_star(type)

對於輸入的 'text'，傳回 [Mime[:json], Mime[:xml], Mime[:ics], Mime[:html], Mime[:css], Mime[:csv], Mime[:js], Mime[:yaml], Mime[:text]]。

對於輸入的 'application'，傳回 [Mime[:html], Mime[:js], Mime[:xml], Mime[:yaml], Mime[:atom], Mime[:json], Mime[:rss], Mime[:url_encoded_form]]。

來源：顯示 | 在 GitHub 上 

# File actionpack/lib/action_dispatch/http/mime_type.rb, line 229
def parse_data_with_trailing_star(type)
  Mime::SET.select { |m| m.match?(type) }
end

parse_trailing_star(accept_header)

來源：顯示 | 在 GitHub 上 

# File actionpack/lib/action_dispatch/http/mime_type.rb, line 220
def parse_trailing_star(accept_header)
  parse_data_with_trailing_star($1) if accept_header =~ TRAILING_STAR_REGEXP
end

register(string, symbol, mime_type_synonyms = [], extension_synonyms = [], skip_lookup = false)

來源：顯示 | 在 GitHub 上 

# File actionpack/lib/action_dispatch/http/mime_type.rb, line 179
def register(string, symbol, mime_type_synonyms = [], extension_synonyms = [], skip_lookup = false)
  new_mime = Type.new(string, symbol, mime_type_synonyms)

  SET << new_mime

  ([string] + mime_type_synonyms).each { |str| LOOKUP[str] = new_mime } unless skip_lookup
  ([symbol] + extension_synonyms).each { |ext| EXTENSION_LOOKUP[ext.to_s] = new_mime }

  @register_callbacks.each do |callback|
    callback.call(new_mime)
  end
  new_mime
end

register_alias(string, symbol, extension_synonyms = [])

註冊一個別用於 MIME 類型查詢的別名，但可以直接參照。特別適用於根據使用者代理呈現不同的 HTML 版本，例如 iPhone。

來源：顯示 | 在 GitHub 上 

# File actionpack/lib/action_dispatch/http/mime_type.rb, line 175
def register_alias(string, symbol, extension_synonyms = [])
  register(string, symbol, [], extension_synonyms, true)
end

register_callback(&block)

來源：顯示 | 在 GitHub 上 

# File actionpack/lib/action_dispatch/http/mime_type.rb, line 160
def register_callback(&block)
  @register_callbacks << block
end

unregister(symbol)

此方法與 register 方法相反。

要取消註冊 MIME 類型

Mime::Type.unregister(:mobile)

來源：顯示 | 在 GitHub 上 

# File actionpack/lib/action_dispatch/http/mime_type.rb, line 238
def unregister(symbol)
  symbol = symbol.downcase
  if mime = Mime[symbol]
    SET.delete_if { |v| v.eql?(mime) }
    LOOKUP.delete_if { |_, v| v.eql?(mime) }
    EXTENSION_LOOKUP.delete_if { |_, v| v.eql?(mime) }
  end
end

實例公開方法

==(mime_type)

來源：顯示 | 在 GitHub 上 

# File actionpack/lib/action_dispatch/http/mime_type.rb, line 290
def ==(mime_type)
  return false unless mime_type
  (@synonyms + [ self ]).any? do |synonym|
    synonym.to_s == mime_type.to_s || synonym.to_sym == mime_type.to_sym
  end
end

===(list)

來源：顯示 | 在 GitHub 上 

# File actionpack/lib/action_dispatch/http/mime_type.rb, line 282
def ===(list)
  if list.is_a?(Array)
    (@synonyms + [ self ]).any? { |synonym| list.include?(synonym) }
  else
    super
  end
end

=~(mime_type)

來源：顯示 | 在 GitHub 上 

# File actionpack/lib/action_dispatch/http/mime_type.rb, line 304
def =~(mime_type)
  return false unless mime_type
  regexp = Regexp.new(Regexp.quote(mime_type.to_s))
  @synonyms.any? { |synonym| synonym.to_s =~ regexp } || @string =~ regexp
end

all?()

來源：顯示 | 在 GitHub 上 

# File actionpack/lib/action_dispatch/http/mime_type.rb, line 320
def all?; false; end

eql?(other)

來源：顯示 | 在 GitHub 上 

# File actionpack/lib/action_dispatch/http/mime_type.rb, line 297
def eql?(other)
  super || (self.class == other.class &&
            @string    == other.string &&
            @synonyms  == other.synonyms &&
            @symbol    == other.symbol)
end

html?()

來源：顯示 | 在 GitHub 上 

# File actionpack/lib/action_dispatch/http/mime_type.rb, line 316
def html?
  (symbol == :html) || @string.include?("html")
end

match?(mime_type)

來源：顯示 | 在 GitHub 上 

# File actionpack/lib/action_dispatch/http/mime_type.rb, line 310
def match?(mime_type)
  return false unless mime_type
  regexp = Regexp.new(Regexp.quote(mime_type.to_s))
  @synonyms.any? { |synonym| synonym.to_s.match?(regexp) } || @string.match?(regexp)
end

ref()

來源：顯示 | 在 GitHub 上 

# File actionpack/lib/action_dispatch/http/mime_type.rb, line 278
def ref
  symbol || to_s
end

to_s()

來源：顯示 | 在 GitHub 上 

# File actionpack/lib/action_dispatch/http/mime_type.rb, line 266
def to_s
  @string
end

to_str()

來源：顯示 | 在 GitHub 上 

# File actionpack/lib/action_dispatch/http/mime_type.rb, line 270
def to_str
  to_s
end

to_sym()

來源：顯示 | 在 GitHub 上 

# File actionpack/lib/action_dispatch/http/mime_type.rb, line 274
def to_sym
  @symbol
end