Class: Mime::Type

Inherits:
Object show all
Defined in:
actionpack/lib/action_dispatch/http/mime_type.rb

Overview

Encapsulates the notion of a mime type. Can be used at render time, for example, with:

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

    respond_to do |format|
      format.html
      format.ics { render text: post.to_ics, mime_type: Mime::Type["text/calendar"]  }
      format.xml { render xml: @people }
    end
  end
end

Defined Under Namespace

Classes: AcceptItem, AcceptList

Constant Summary collapse

TRAILING_STAR_REGEXP =
/(text|application)\/\*/
PARAMETER_SEPARATOR_REGEXP =
/;\s*\w+="?\w+"?/
@@html_types =
Set.new [:html, :all]

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(string, symbol = nil, synonyms = []) ⇒ Type

Returns a new instance of Type.


228
229
230
231
# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 228

def initialize(string, symbol = nil, synonyms = [])
  @symbol, @synonyms = symbol, synonyms
  @string = string
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method, *args) ⇒ Object (private)


282
283
284
285
286
287
288
# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 282

def method_missing(method, *args)
  if method.to_s.ends_with? '?'
    method[0..-2].downcase.to_sym == to_sym
  else
    super
  end
end

Instance Attribute Details

#symbolObject (readonly)

Returns the value of attribute symbol


57
58
59
# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 57

def symbol
  @symbol
end

Class Method Details

.lookup(string) ⇒ Object


148
149
150
# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 148

def lookup(string)
  LOOKUP[string]
end

.lookup_by_extension(extension) ⇒ Object


152
153
154
# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 152

def lookup_by_extension(extension)
  EXTENSION_LOOKUP[extension.to_s]
end

.parse(accept_header) ⇒ Object


176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 176

def parse(accept_header)
  if !accept_header.include?(',')
    accept_header = accept_header.split(PARAMETER_SEPARATOR_REGEXP).first
    parse_trailing_star(accept_header) || [Mime::Type.lookup(accept_header)].compact
  else
    list, index = AcceptList.new, 0
    accept_header.split(',').each do |header|
      params, q = header.split(PARAMETER_SEPARATOR_REGEXP)
      if params.present?
        params.strip!

        params = parse_trailing_star(params) || [params]

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

.parse_data_with_trailing_star(input) ⇒ Object

For an input of 'text', returns [Mime::JSON, Mime::XML, Mime::ICS, Mime::HTML, Mime::CSS, Mime::CSV, Mime::JS, Mime::YAML, Mime::TEXT].

For an input of 'application', returns [Mime::HTML, Mime::JS, Mime::XML, Mime::YAML, Mime::ATOM, Mime::JSON, Mime::RSS, Mime::URL_ENCODED_FORM].


208
209
210
# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 208

def parse_data_with_trailing_star(input)
  Mime::SET.select { |m| m =~ input }
end

.parse_trailing_star(accept_header) ⇒ Object


199
200
201
# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 199

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) ⇒ Object


162
163
164
165
166
167
168
169
170
171
172
173
174
# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 162

def register(string, symbol, mime_type_synonyms = [], extension_synonyms = [], skip_lookup = false)
  Mime.const_set(symbol.upcase, Type.new(string, symbol, mime_type_synonyms))

  new_mime = Mime.const_get(symbol.upcase)
  SET << new_mime

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

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

.register_alias(string, symbol, extension_synonyms = []) ⇒ Object

Registers an alias that's not used on mime type lookup, but can be referenced directly. Especially useful for rendering different HTML versions depending on the user agent, like an iPhone.


158
159
160
# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 158

def register_alias(string, symbol, extension_synonyms = [])
  register(string, symbol, [], extension_synonyms, true)
end

.register_callback(&block) ⇒ Object


144
145
146
# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 144

def register_callback(&block)
  @register_callbacks << block
end

.unregister(symbol) ⇒ Object

This method is opposite of register method.

Usage:

Mime::Type.unregister(:mobile)

217
218
219
220
221
222
223
224
225
# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 217

def unregister(symbol)
  symbol = symbol.upcase
  mime = Mime.const_get(symbol)
  Mime.instance_eval { remove_const(symbol) }

  SET.delete_if { |v| v.eql?(mime) }
  LOOKUP.delete_if { |_,v| v.eql?(mime) }
  EXTENSION_LOOKUP.delete_if { |_,v| v.eql?(mime) }
end

Instance Method Details

#==(mime_type) ⇒ Object


257
258
259
260
261
262
# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 257

def ==(mime_type)
  return false if mime_type.blank?
  (@synonyms + [ self ]).any? do |synonym|
    synonym.to_s == mime_type.to_s || synonym.to_sym == mime_type.to_sym
  end
end

#===(list) ⇒ Object


249
250
251
252
253
254
255
# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 249

def ===(list)
  if list.is_a?(Array)
    (@synonyms + [ self ]).any? { |synonym| list.include?(synonym) }
  else
    super
  end
end

#=~(mime_type) ⇒ Object


264
265
266
267
268
269
270
# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 264

def =~(mime_type)
  return false if mime_type.blank?
  regexp = Regexp.new(Regexp.quote(mime_type.to_s))
  (@synonyms + [ self ]).any? do |synonym|
    synonym.to_s =~ regexp
  end
end

#html?Boolean

Returns:

  • (Boolean)

272
273
274
# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 272

def html?
  @@html_types.include?(to_sym) || @string =~ /html/
end

#refObject


245
246
247
# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 245

def ref
  to_sym || to_s
end

#to_sObject


233
234
235
# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 233

def to_s
  @string
end

#to_strObject


237
238
239
# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 237

def to_str
  to_s
end

#to_symObject


241
242
243
# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 241

def to_sym
  @symbol
end