Source

RubyLearning / ProjectTrak / vendor / rails / actionpack / lib / action_view / helpers / text_helper.rb

Full commit
  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
require 'action_view/helpers/tag_helper'

begin
  require 'html/document'
rescue LoadError
  html_scanner_path = "#{File.dirname(__FILE__)}/../../action_controller/vendor/html-scanner"
  if File.directory?(html_scanner_path)
    $:.unshift html_scanner_path
    require 'html/document'
  end
end

module ActionView
  module Helpers #:nodoc:
    # The TextHelper module provides a set of methods for filtering, formatting
    # and transforming strings, which can reduce the amount of inline Ruby code in
    # your views. These helper methods extend ActionView making them callable
    # within your template files.
    module TextHelper
      # The preferred method of outputting text in your views is to use the
      # <%= "text" %> eRuby syntax. The regular _puts_ and _print_ methods
      # do not operate as expected in an eRuby code block. If you absolutely must
      # output text within a non-output code block (i.e., <% %>), you can use the concat method.
      #
      # ==== Examples
      #   <%
      #       concat "hello"
      #       # is the equivalent of <%= "hello" %>
      #
      #       if (logged_in == true):
      #         concat "Logged in!"
      #       else
      #         concat link_to('login', :action => login)
      #       end
      #       # will either display "Logged in!" or a login link
      #   %>
      def concat(string, unused_binding = nil)
        if unused_binding
          ActiveSupport::Deprecation.warn("The binding argument of #concat is no longer needed.  Please remove it from your views and helpers.", caller)
        end

        output_buffer << string
      end

      # Truncates a given +text+ after a given <tt>:length</tt> if +text+ is longer than <tt>:length</tt>
      # (defaults to 30). The last characters will be replaced with the <tt>:omission</tt> (defaults to "...").
      #
      # ==== Examples
      #
      #   truncate("Once upon a time in a world far far away")
      #   # => Once upon a time in a world f...
      #
      #   truncate("Once upon a time in a world far far away", :length => 14)
      #   # => Once upon a...
      #
      #   truncate("And they found that many people were sleeping better.", :length => 25, "(clipped)")
      #   # => And they found that many (clipped)
      #
      #   truncate("And they found that many people were sleeping better.", :omission => "... (continued)", :length => 15)
      #   # => And they found... (continued)
      #
      # You can still use <tt>truncate</tt> with the old API that accepts the
      # +length+ as its optional second and the +ellipsis+ as its
      # optional third parameter:
      #   truncate("Once upon a time in a world far far away", 14)
      #   # => Once upon a time in a world f...
      #
      #   truncate("And they found that many people were sleeping better.", 15, "... (continued)")
      #   # => And they found... (continued)
      def truncate(text, *args)
        options = args.extract_options!
        unless args.empty?
          ActiveSupport::Deprecation.warn('truncate takes an option hash instead of separate ' +
            'length and omission arguments', caller)

          options[:length] = args[0] || 30
          options[:omission] = args[1] || "..."
        end
        options.reverse_merge!(:length => 30, :omission => "...")

        if text
          l = options[:length] - options[:omission].mb_chars.length
          chars = text.mb_chars
          (chars.length > options[:length] ? chars[0...l] + options[:omission] : text).to_s
        end
      end

      # Highlights one or more +phrases+ everywhere in +text+ by inserting it into
      # a <tt>:highlighter</tt> string. The highlighter can be specialized by passing <tt>:highlighter</tt>
      # as a single-quoted string with \1 where the phrase is to be inserted (defaults to
      # '<strong class="highlight">\1</strong>')
      #
      # ==== Examples
      #   highlight('You searched for: rails', 'rails')
      #   # => You searched for: <strong class="highlight">rails</strong>
      #
      #   highlight('You searched for: ruby, rails, dhh', 'actionpack')
      #   # => You searched for: ruby, rails, dhh
      #
      #   highlight('You searched for: rails', ['for', 'rails'], :highlighter => '<em>\1</em>')
      #   # => You searched <em>for</em>: <em>rails</em>
      #
      #   highlight('You searched for: rails', 'rails', :highlighter => '<a href="search?q=\1">\1</a>')
      #   # => You searched for: <a href="search?q=rails">rails</a>
      #
      # You can still use <tt>highlight</tt> with the old API that accepts the
      # +highlighter+ as its optional third parameter:
      #   highlight('You searched for: rails', 'rails', '<a href="search?q=\1">\1</a>')     # => You searched for: <a href="search?q=rails">rails</a>
      def highlight(text, phrases, *args)
        options = args.extract_options!
        unless args.empty?
          options[:highlighter] = args[0] || '<strong class="highlight">\1</strong>'
        end
        options.reverse_merge!(:highlighter => '<strong class="highlight">\1</strong>')

        if text.blank? || phrases.blank?
          text
        else
          match = Array(phrases).map { |p| Regexp.escape(p) }.join('|')
          text.gsub(/(#{match})/i, options[:highlighter])
        end
      end

      # Extracts an excerpt from +text+ that matches the first instance of +phrase+.
      # The <tt>:radius</tt> option expands the excerpt on each side of the first occurrence of +phrase+ by the number of characters
      # defined in <tt>:radius</tt> (which defaults to 100). If the excerpt radius overflows the beginning or end of the +text+,
      # then the <tt>:omission</tt> option (which defaults to "...") will be prepended/appended accordingly. The resulting string
      # will be stripped in any case. If the +phrase+ isn't found, nil is returned.
      #
      # ==== Examples
      #   excerpt('This is an example', 'an', :radius => 5)
      #   # => ...s is an exam...
      #
      #   excerpt('This is an example', 'is', :radius => 5)
      #   # => This is a...
      #
      #   excerpt('This is an example', 'is')
      #   # => This is an example
      #
      #   excerpt('This next thing is an example', 'ex', :radius => 2)
      #   # => ...next...
      #
      #   excerpt('This is also an example', 'an', :radius => 8, :omission => '<chop> ')
      #   # => <chop> is also an example
      #
      # You can still use <tt>excerpt</tt> with the old API that accepts the
      # +radius+ as its optional third and the +ellipsis+ as its
      # optional forth parameter:
      #   excerpt('This is an example', 'an', 5)                   # => ...s is an exam...
      #   excerpt('This is also an example', 'an', 8, '<chop> ')   # => <chop> is also an example
      def excerpt(text, phrase, *args)
        options = args.extract_options!
        unless args.empty?
          options[:radius] = args[0] || 100
          options[:omission] = args[1] || "..."
        end
        options.reverse_merge!(:radius => 100, :omission => "...")

        if text && phrase
          phrase = Regexp.escape(phrase)

          if found_pos = text.mb_chars =~ /(#{phrase})/i
            start_pos = [ found_pos - options[:radius], 0 ].max
            end_pos   = [ [ found_pos + phrase.mb_chars.length + options[:radius] - 1, 0].max, text.mb_chars.length ].min

            prefix  = start_pos > 0 ? options[:omission] : ""
            postfix = end_pos < text.mb_chars.length - 1 ? options[:omission] : ""

            prefix + text.mb_chars[start_pos..end_pos].strip + postfix
          else
            nil
          end
        end
      end

      # Attempts to pluralize the +singular+ word unless +count+ is 1. If
      # +plural+ is supplied, it will use that when count is > 1, otherwise
      # it will use the Inflector to determine the plural form
      #
      # ==== Examples
      #   pluralize(1, 'person')
      #   # => 1 person
      #
      #   pluralize(2, 'person')
      #   # => 2 people
      #
      #   pluralize(3, 'person', 'users')
      #   # => 3 users
      #
      #   pluralize(0, 'person')
      #   # => 0 people
      def pluralize(count, singular, plural = nil)
        "#{count || 0} " + ((count == 1 || count == '1') ? singular : (plural || singular.pluralize))
      end

      # Wraps the +text+ into lines no longer than +line_width+ width. This method
      # breaks on the first whitespace character that does not exceed +line_width+
      # (which is 80 by default).
      #
      # ==== Examples
      #
      #   word_wrap('Once upon a time')
      #   # => Once upon a time
      #
      #   word_wrap('Once upon a time, in a kingdom called Far Far Away, a king fell ill, and finding a successor to the throne turned out to be more trouble than anyone could have imagined...')
      #   # => Once upon a time, in a kingdom called Far Far Away, a king fell ill, and finding\n a successor to the throne turned out to be more trouble than anyone could have\n imagined...
      #
      #   word_wrap('Once upon a time', :line_width => 8)
      #   # => Once upon\na time
      #
      #   word_wrap('Once upon a time', :line_width => 1)
      #   # => Once\nupon\na\ntime
      #
      # You can still use <tt>word_wrap</tt> with the old API that accepts the
      # +line_width+ as its optional second parameter:
      #   word_wrap('Once upon a time', 8)     # => Once upon\na time
      def word_wrap(text, *args)
        options = args.extract_options!
        unless args.blank?
          options[:line_width] = args[0] || 80
        end
        options.reverse_merge!(:line_width => 80)

        text.split("\n").collect do |line|
          line.length > options[:line_width] ? line.gsub(/(.{1,#{options[:line_width]}})(\s+|$)/, "\\1\n").strip : line
        end * "\n"
      end

      begin
        require_library_or_gem "redcloth" unless Object.const_defined?(:RedCloth)

        # Returns the text with all the Textile[http://www.textism.com/tools/textile] codes turned into HTML tags.
        #
        # You can learn more about Textile's syntax at its website[http://www.textism.com/tools/textile].
        # <i>This method is only available if RedCloth[http://whytheluckystiff.net/ruby/redcloth/]
        # is available</i>.
        #
        # ==== Examples
        #   textilize("*This is Textile!*  Rejoice!")
        #   # => "<p><strong>This is Textile!</strong>  Rejoice!</p>"
        #
        #   textilize("I _love_ ROR(Ruby on Rails)!")
        #   # => "<p>I <em>love</em> <acronym title="Ruby on Rails">ROR</acronym>!</p>"
        #
        #   textilize("h2. Textile makes markup -easy- simple!")
        #   # => "<h2>Textile makes markup <del>easy</del> simple!</h2>"
        #
        #   textilize("Visit the Rails website "here":http://www.rubyonrails.org/.)
        #   # => "<p>Visit the Rails website <a href="http://www.rubyonrails.org/">here</a>.</p>"
        def textilize(text)
          if text.blank?
            ""
          else
            textilized = RedCloth.new(text, [ :hard_breaks ])
            textilized.hard_breaks = true if textilized.respond_to?(:hard_breaks=)
            textilized.to_html
          end
        end

        # Returns the text with all the Textile codes turned into HTML tags,
        # but without the bounding <p> tag that RedCloth adds.
        #
        # You can learn more about Textile's syntax at its website[http://www.textism.com/tools/textile].
        # <i>This method is only available if RedCloth[http://whytheluckystiff.net/ruby/redcloth/]
        # is available</i>.
        #
        # ==== Examples
        #   textilize_without_paragraph("*This is Textile!*  Rejoice!")
        #   # => "<strong>This is Textile!</strong>  Rejoice!"
        #
        #   textilize_without_paragraph("I _love_ ROR(Ruby on Rails)!")
        #   # => "I <em>love</em> <acronym title="Ruby on Rails">ROR</acronym>!"
        #
        #   textilize_without_paragraph("h2. Textile makes markup -easy- simple!")
        #   # => "<h2>Textile makes markup <del>easy</del> simple!</h2>"
        #
        #   textilize_without_paragraph("Visit the Rails website "here":http://www.rubyonrails.org/.)
        #   # => "Visit the Rails website <a href="http://www.rubyonrails.org/">here</a>."
        def textilize_without_paragraph(text)
          textiled = textilize(text)
          if textiled[0..2] == "<p>" then textiled = textiled[3..-1] end
          if textiled[-4..-1] == "</p>" then textiled = textiled[0..-5] end
          return textiled
        end
      rescue LoadError
        # We can't really help what's not there
      end

      begin
        require_library_or_gem "bluecloth" unless Object.const_defined?(:BlueCloth)

        # Returns the text with all the Markdown codes turned into HTML tags.
        # <i>This method is only available if BlueCloth[http://www.deveiate.org/projects/BlueCloth]
        # is available</i>.
        #
        # ==== Examples
        #   markdown("We are using __Markdown__ now!")
        #   # => "<p>We are using <strong>Markdown</strong> now!</p>"
        #
        #   markdown("We like to _write_ `code`, not just _read_ it!")
        #   # => "<p>We like to <em>write</em> <code>code</code>, not just <em>read</em> it!</p>"
        #
        #   markdown("The [Markdown website](http://daringfireball.net/projects/markdown/) has more information.")
        #   # => "<p>The <a href="http://daringfireball.net/projects/markdown/">Markdown website</a>
        #   #     has more information.</p>"
        #
        #   markdown('![The ROR logo](http://rubyonrails.com/images/rails.png "Ruby on Rails")')
        #   # => '<p><img src="http://rubyonrails.com/images/rails.png" alt="The ROR logo" title="Ruby on Rails" /></p>'
        def markdown(text)
          text.blank? ? "" : BlueCloth.new(text).to_html
        end
      rescue LoadError
        # We can't really help what's not there
      end

      # Returns +text+ transformed into HTML using simple formatting rules.
      # Two or more consecutive newlines(<tt>\n\n</tt>) are considered as a
      # paragraph and wrapped in <tt><p></tt> tags. One newline (<tt>\n</tt>) is
      # considered as a linebreak and a <tt><br /></tt> tag is appended. This
      # method does not remove the newlines from the +text+.
      #
      # You can pass any HTML attributes into <tt>html_options</tt>.  These
      # will be added to all created paragraphs.
      # ==== Examples
      #   my_text = "Here is some basic text...\n...with a line break."
      #
      #   simple_format(my_text)
      #   # => "<p>Here is some basic text...\n<br />...with a line break.</p>"
      #
      #   more_text = "We want to put a paragraph...\n\n...right there."
      #
      #   simple_format(more_text)
      #   # => "<p>We want to put a paragraph...</p>\n\n<p>...right there.</p>"
      #
      #   simple_format("Look ma! A class!", :class => 'description')
      #   # => "<p class='description'>Look ma! A class!</p>"
      def simple_format(text, html_options={})
        start_tag = tag('p', html_options, true)
        text = text.to_s.dup
        text.gsub!(/\r\n?/, "\n")                    # \r\n and \r -> \n
        text.gsub!(/\n\n+/, "</p>\n\n#{start_tag}")  # 2+ newline  -> paragraph
        text.gsub!(/([^\n]\n)(?=[^\n])/, '\1<br />') # 1 newline   -> br
        text.insert 0, start_tag
        text << "</p>"
      end

      # Turns all URLs and e-mail addresses into clickable links. The <tt>:link</tt> option
      # will limit what should be linked. You can add HTML attributes to the links using
      # <tt>:href_options</tt>. Possible values for <tt>:link</tt> are <tt>:all</tt> (default),
      # <tt>:email_addresses</tt>, and <tt>:urls</tt>. If a block is given, each URL and
      # e-mail address is yielded and the result is used as the link text.
      #
      # ==== Examples
      #   auto_link("Go to http://www.rubyonrails.org and say hello to david@loudthinking.com")
      #   # => "Go to <a href=\"http://www.rubyonrails.org\">http://www.rubyonrails.org</a> and
      #   #     say hello to <a href=\"mailto:david@loudthinking.com\">david@loudthinking.com</a>"
      #
      #   auto_link("Visit http://www.loudthinking.com/ or e-mail david@loudthinking.com", :link => :urls)
      #   # => "Visit <a href=\"http://www.loudthinking.com/\">http://www.loudthinking.com/</a>
      #   #     or e-mail david@loudthinking.com"
      #
      #   auto_link("Visit http://www.loudthinking.com/ or e-mail david@loudthinking.com", :link => :email_addresses)
      #   # => "Visit http://www.loudthinking.com/ or e-mail <a href=\"mailto:david@loudthinking.com\">david@loudthinking.com</a>"
      #
      #   post_body = "Welcome to my new blog at http://www.myblog.com/.  Please e-mail me at me@email.com."
      #   auto_link(post_body, :href_options => { :target => '_blank' }) do |text|
      #     truncate(text, 15)
      #   end
      #   # => "Welcome to my new blog at <a href=\"http://www.myblog.com/\" target=\"_blank\">http://www.m...</a>.
      #         Please e-mail me at <a href=\"mailto:me@email.com\">me@email.com</a>."
      #
      #
      # You can still use <tt>auto_link</tt> with the old API that accepts the
      # +link+ as its optional second parameter and the +html_options+ hash
      # as its optional third parameter:
      #   post_body = "Welcome to my new blog at http://www.myblog.com/. Please e-mail me at me@email.com."
      #   auto_link(post_body, :urls)     # => Once upon\na time
      #   # => "Welcome to my new blog at <a href=\"http://www.myblog.com/\">http://www.myblog.com</a>.
      #         Please e-mail me at me@email.com."
      #
      #   auto_link(post_body, :all, :target => "_blank")     # => Once upon\na time
      #   # => "Welcome to my new blog at <a href=\"http://www.myblog.com/\" target=\"_blank\">http://www.myblog.com</a>.
      #         Please e-mail me at <a href=\"mailto:me@email.com\">me@email.com</a>."
      def auto_link(text, *args, &block)#link = :all, href_options = {}, &block)
        return '' if text.blank?

        options = args.size == 2 ? {} : args.extract_options! # this is necessary because the old auto_link API has a Hash as its last parameter
        unless args.empty?
          options[:link] = args[0] || :all
          options[:html] = args[1] || {}
        end
        options.reverse_merge!(:link => :all, :html => {})

        case options[:link].to_sym
          when :all                         then auto_link_email_addresses(auto_link_urls(text, options[:html], &block), &block)
          when :email_addresses             then auto_link_email_addresses(text, &block)
          when :urls                        then auto_link_urls(text, options[:html], &block)
        end
      end

      # Creates a Cycle object whose _to_s_ method cycles through elements of an
      # array every time it is called. This can be used for example, to alternate
      # classes for table rows.  You can use named cycles to allow nesting in loops.
      # Passing a Hash as the last parameter with a <tt>:name</tt> key will create a
      # named cycle. The default name for a cycle without a +:name+ key is
      # <tt>"default"</tt>. You can manually reset a cycle by calling reset_cycle
      # and passing the name of the cycle. The current cycle string can be obtained
      # anytime using the current_cycle method.
      #
      # ==== Examples
      #   # Alternate CSS classes for even and odd numbers...
      #   @items = [1,2,3,4]
      #   <table>
      #   <% @items.each do |item| %>
      #     <tr class="<%= cycle("even", "odd") -%>">
      #       <td>item</td>
      #     </tr>
      #   <% end %>
      #   </table>
      #
      #
      #   # Cycle CSS classes for rows, and text colors for values within each row
      #   @items = x = [{:first => 'Robert', :middle => 'Daniel', :last => 'James'},
      #                {:first => 'Emily', :middle => 'Shannon', :maiden => 'Pike', :last => 'Hicks'},
      #               {:first => 'June', :middle => 'Dae', :last => 'Jones'}]
      #   <% @items.each do |item| %>
      #     <tr class="<%= cycle("even", "odd", :name => "row_class") -%>">
      #       <td>
      #         <% item.values.each do |value| %>
      #           <%# Create a named cycle "colors" %>
      #           <span style="color:<%= cycle("red", "green", "blue", :name => "colors") -%>">
      #             <%= value %>
      #           </span>
      #         <% end %>
      #         <% reset_cycle("colors") %>
      #       </td>
      #    </tr>
      #  <% end %>
      def cycle(first_value, *values)
        if (values.last.instance_of? Hash)
          params = values.pop
          name = params[:name]
        else
          name = "default"
        end
        values.unshift(first_value)

        cycle = get_cycle(name)
        if (cycle.nil? || cycle.values != values)
          cycle = set_cycle(name, Cycle.new(*values))
        end
        return cycle.to_s
      end

      # Returns the current cycle string after a cycle has been started. Useful
      # for complex table highlighing or any other design need which requires
      # the current cycle string in more than one place.
      #
      # ==== Example
      #   # Alternate background colors
      #   @items = [1,2,3,4]
      #   <% @items.each do |item| %>
      #     <div style="background-color:<%= cycle("red","white","blue") %>">
      #       <span style="background-color:<%= current_cycle %>"><%= item %></span>
      #     </div>
      #   <% end %>
      def current_cycle(name = "default")
        cycle = get_cycle(name)
        cycle.current_value unless cycle.nil?
      end

      # Resets a cycle so that it starts from the first element the next time
      # it is called. Pass in +name+ to reset a named cycle.
      #
      # ==== Example
      #   # Alternate CSS classes for even and odd numbers...
      #   @items = [[1,2,3,4], [5,6,3], [3,4,5,6,7,4]]
      #   <table>
      #   <% @items.each do |item| %>
      #     <tr class="<%= cycle("even", "odd") -%>">
      #         <% item.each do |value| %>
      #           <span style="color:<%= cycle("#333", "#666", "#999", :name => "colors") -%>">
      #             <%= value %>
      #           </span>
      #         <% end %>
      #
      #         <% reset_cycle("colors") %>
      #     </tr>
      #   <% end %>
      #   </table>
      def reset_cycle(name = "default")
        cycle = get_cycle(name)
        cycle.reset unless cycle.nil?
      end

      class Cycle #:nodoc:
        attr_reader :values

        def initialize(first_value, *values)
          @values = values.unshift(first_value)
          reset
        end

        def reset
          @index = 0
        end

        def current_value
          @values[previous_index].to_s
        end

        def to_s
          value = @values[@index].to_s
          @index = next_index
          return value
        end

        private

        def next_index
          step_index(1)
        end

        def previous_index
          step_index(-1)
        end

        def step_index(n)
          (@index + n) % @values.size
        end
      end

      private
        # The cycle helpers need to store the cycles in a place that is
        # guaranteed to be reset every time a page is rendered, so it
        # uses an instance variable of ActionView::Base.
        def get_cycle(name)
          @_cycles = Hash.new unless defined?(@_cycles)
          return @_cycles[name]
        end

        def set_cycle(name, cycle_object)
          @_cycles = Hash.new unless defined?(@_cycles)
          @_cycles[name] = cycle_object
        end

        AUTO_LINK_RE = %r{
                        (                          # leading text
                          <\w+.*?>|                # leading HTML tag, or
                          [^=!:'"/]|               # leading punctuation, or
                          ^                        # beginning of line
                        )
                        (
                          (?:https?://)|           # protocol spec, or
                          (?:www\.)                # www.*
                        )
                        (
                          [-\w]+                   # subdomain or domain
                          (?:\.[-\w]+)*            # remaining subdomains or domain
                          (?::\d+)?                # port
                          (?:/(?:[~\w\+@%=\(\)-]|(?:[,.;:'][^\s$]))*)* # path
                          (?:\?[\w\+@%&=.;:-]+)?     # query string
                          (?:\#[\w\-]*)?           # trailing anchor
                        )
                        ([[:punct:]]|<|$|)       # trailing text
                       }x unless const_defined?(:AUTO_LINK_RE)

        # Turns all urls into clickable links.  If a block is given, each url
        # is yielded and the result is used as the link text.
        def auto_link_urls(text, html_options = {})
          extra_options = tag_options(html_options.stringify_keys) || ""
          text.gsub(AUTO_LINK_RE) do
            all, a, b, c, d = $&, $1, $2, $3, $4
            if a =~ /<a\s/i # don't replace URL's that are already linked
              all
            else
              text = b + c
              text = yield(text) if block_given?
              %(#{a}<a href="#{b=="www."?"http://www.":b}#{c}"#{extra_options}>#{text}</a>#{d})
            end
          end
        end

        # Turns all email addresses into clickable links.  If a block is given,
        # each email is yielded and the result is used as the link text.
        def auto_link_email_addresses(text)
          body = text.dup
          text.gsub(/([\w\.!#\$%\-+.]+@[A-Za-z0-9\-]+(\.[A-Za-z0-9\-]+)+)/) do
            text = $1

            if body.match(/<a\b[^>]*>(.*)(#{Regexp.escape(text)})(.*)<\/a>/)
              text
            else
              display_text = (block_given?) ? yield(text) : text
              %{<a href="mailto:#{text}">#{display_text}</a>}
            end
          end
        end
    end
  end
end