require 'action_view/helpers/tag_helper' require 'html/document' 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", binding # # is the equivalent of <%= "hello" %> # # if (logged_in == true): # concat "Logged in!", binding # else # concat link_to('login', :action => login), binding # end # # will either display "Logged in!" or a login link # %> def concat(string, binding) eval(ActionView::Base.erb_variable, binding) << string end # If +text+ is longer than +length+, +text+ will be truncated to the length of # +length+ (defaults to 30) and the last characters will be replaced with the +truncate_string+ # (defaults to "..."). # # ==== Examples # truncate("Once upon a time in a world far far away", 14) # # => Once upon a... # # truncate("Once upon a time in a world far far away") # # => Once upon a time in a world f... # # truncate("And they found that many people were sleeping better.", 25, "(clipped)") # # => And they found that many (clipped) # # truncate("And they found that many people were sleeping better.", 15, "... (continued)") # # => And they found... (continued) def truncate(text, length = 30, truncate_string = "...") if text.nil? then return end l = length - truncate_string.chars.length (text.chars.length > length ? text.chars[0...l] + truncate_string : text).to_s end # Highlights one or more +phrases+ everywhere in +text+ by inserting it into # a +highlighter+ string. The highlighter can be specialized by passing +highlighter+ # as a single-quoted string with \1 where the phrase is to be inserted (defaults to # '\1') # # ==== Examples # highlight('You searched for: rails', 'rails') # # => You searched for: rails # # highlight('You searched for: ruby, rails, dhh', 'actionpack') # # => You searched for: ruby, rails, dhh # # highlight('You searched for: rails', ['for', 'rails'], '\1') # # => You searched for: rails # # highlight('You searched for: rails', 'rails', "\1") # # => You searched for: \1') if text.blank? || phrases.blank? text else match = Array(phrases).map { |p| Regexp.escape(p) }.join('|') text.gsub(/(#{match})/i, highlighter) end end # Extracts an excerpt from +text+ that matches the first instance of +phrase+. # The +radius+ expands the excerpt on each side of the first occurance of +phrase+ by the number of characters # defined in +radius+ (which defaults to 100). If the excerpt radius overflows the beginning or end of the +text+, # then the +excerpt_string+ will be prepended/appended accordingly. If the +phrase+ # isn't found, nil is returned. # # ==== Examples # excerpt('This is an example', 'an', 5) # # => "...s is an examp..." # # excerpt('This is an example', 'is', 5) # # => "This is an..." # # excerpt('This is an example', 'is') # # => "This is an example" # # excerpt('This next thing is an example', 'ex', 2) # # => "...next t..." # # excerpt('This is also an example', 'an', 8, ' ') # # => " is also an example" def excerpt(text, phrase, radius = 100, excerpt_string = "...") if text.nil? || phrase.nil? then return end phrase = Regexp.escape(phrase) if found_pos = text.chars =~ /(#{phrase})/i start_pos = [ found_pos - radius, 0 ].max end_pos = [ found_pos + phrase.chars.length + radius, text.chars.length ].min prefix = start_pos > 0 ? excerpt_string : "" postfix = end_pos < text.chars.length ? excerpt_string : "" prefix + text.chars[start_pos..end_pos].strip + postfix else nil end end # Attempts to pluralize the +singular+ word unless +count+ is 1. If +plural+ # is supplied, it will use that when count is > 1, if the ActiveSupport Inflector # is loaded, it will use the Inflector to determine the plural form, otherwise # it will just add an 's' to the +singular+ word. # # ==== 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} " + if count == 1 || count == '1' singular elsif plural plural elsif Object.const_defined?("Inflector") Inflector.pluralize(singular) else singular + "s" end 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', 4) # # => Once\nupon\na\ntime # # word_wrap('Once upon a time', 8) # # => Once upon\na time # # word_wrap('Once upon a time') # # => Once upon a time # # word_wrap('Once upon a time', 1) # # => Once\nupon\na\ntime def word_wrap(text, line_width = 80) text.gsub(/\n/, "\n\n").gsub(/(.{1,#{line_width}})(\s+|$)/, "\\1\n").strip 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]. # This method is only available if RedCloth[http://whytheluckystiff.net/ruby/redcloth/] # is available. # # ==== Examples # textilize("*This is Textile!* Rejoice!") # # => "

This is Textile! Rejoice!

" # # textilize("I _love_ ROR(Ruby on Rails)!") # # => "

I love ROR!

" # # textilize("h2. Textile makes markup -easy- simple!") # # => "

Textile makes markup easy simple!

" # # textilize("Visit the Rails website "here":http://www.rubyonrails.org/.) # # => "

Visit the Rails website here.

" 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

tag that RedCloth adds. # # You can learn more about Textile's syntax at its website[http://www.textism.com/tools/textile]. # This method is only available if RedCloth[http://whytheluckystiff.net/ruby/redcloth/] # is available. # # ==== Examples # textilize_without_paragraph("*This is Textile!* Rejoice!") # # => "This is Textile! Rejoice!" # # textilize_without_paragraph("I _love_ ROR(Ruby on Rails)!") # # => "I love ROR!" # # textilize_without_paragraph("h2. Textile makes markup -easy- simple!") # # => "

Textile makes markup easy simple!

" # # textilize_without_paragraph("Visit the Rails website "here":http://www.rubyonrails.org/.) # # => "Visit the Rails website here." def textilize_without_paragraph(text) textiled = textilize(text) if textiled[0..2] == "

" then textiled = textiled[3..-1] end if textiled[-4..-1] == "

" 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. # This method is only available if BlueCloth[http://www.deveiate.org/projects/BlueCloth] # is available. # # ==== Examples # markdown("We are using __Markdown__ now!") # # => "

We are using Markdown now!

" # # markdown("We like to _write_ `code`, not just _read_ it!") # # => "

We like to write code, not just read it!

" # # markdown("The [Markdown website](http://daringfireball.net/projects/markdown/) has more information.") # # => "

The Markdown website # # has more information.

" # # markdown('![The ROR logo](http://rubyonrails.com/images/rails.png "Ruby on Rails")') # # => '

The ROR logo

' 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(\n\n) are considered as a # paragraph and wrapped in

tags. One newline (\n) is # considered as a linebreak and a
tag is appended. This # method does not remove the newlines from the +text+. # # ==== Examples # my_text = """Here is some basic text... # ...with a line break.""" # # simple_format(my_text) # # => "

Here is some basic text...
...with a line break.

" # # more_text = """We want to put a paragraph... # # ...right there.""" # # simple_format(more_text) # # => "

We want to put a paragraph...

...right there.

" def simple_format(text) content_tag 'p', text.to_s. gsub(/\r\n?/, "\n"). # \r\n and \r -> \n gsub(/\n\n+/, "

\n\n

"). # 2+ newline -> paragraph gsub(/([^\n]\n)(?=[^\n])/, '\1
') # 1 newline -> br end # Turns all URLs and e-mail addresses into clickable links. The +link+ parameter # will limit what should be linked. You can add HTML attributes to the links using # +href_options+. Options for +link+ are :all (default), # :email_addresses, and :urls. 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 http://www.rubyonrails.org and # # say hello to david@loudthinking.com" # # auto_link("Visit http://www.loudthinking.com/ or e-mail david@loudthinking.com", :urls) # # => "Visit http://www.loudthinking.com/ # # or e-mail david@loudthinking.com" # # auto_link("Visit http://www.loudthinking.com/ or e-mail david@loudthinking.com", :email_addresses) # # => "Visit http://www.loudthinking.com/ or e-mail david@loudthinking.com" # # post_body = "Welcome to my new blog at http://www.myblog.com/. Please e-mail me at me@email.com." # auto_link(post_body, :all, :target => '_blank') do |text| # truncate(text, 15) # end # # => "Welcome to my new blog at http://www.m.... # Please e-mail me at me@email.com." # def auto_link(text, link = :all, href_options = {}, &block) return '' if text.blank? case link when :all then auto_link_email_addresses(auto_link_urls(text, href_options, &block), &block) when :email_addresses then auto_link_email_addresses(text, &block) when :urls then auto_link_urls(text, href_options, &block) end end # Strips all link tags from +text+ leaving just the link text. # # ==== Examples # strip_links('Ruby on Rails') # # => Ruby on Rails # # strip_links('Please e-mail me at me@email.com.') # # => Please e-mail me at me@email.com. # # strip_links('Blog: Visit.') # # => Blog: Visit def strip_links(text) text.gsub(/(.*?)<\/a>/mi, '\1') end VERBOTEN_TAGS = %w(form script plaintext) unless defined?(VERBOTEN_TAGS) VERBOTEN_ATTRS = /^on/i unless defined?(VERBOTEN_ATTRS) # Sanitizes the +html+ by converting

and ') # # => <script> do_nasty_stuff() </script> # # sanitize('Click here for $100') # # => Click here for $100 # # sanitize('Click here!!!') # # => Click here!!! # # sanitize('') # # => def sanitize(html) # only do this if absolutely necessary if html.index("<") tokenizer = HTML::Tokenizer.new(html) new_text = "" while token = tokenizer.next node = HTML::Node.parse(nil, 0, 0, token, false) new_text << case node when HTML::Tag if VERBOTEN_TAGS.include?(node.name) node.to_s.gsub(/these tags!") # # => Strip these tags! # # strip_tags("Bold no more! See more here...") # # => Bold no more! See more here... # # strip_tags("
Welcome to my website!
") # # => Welcome to my website! def strip_tags(html) return html if html.blank? if html.index("<") text = "" tokenizer = HTML::Tokenizer.new(html) while token = tokenizer.next node = HTML::Node.parse(nil, 0, 0, token, false) # result is only the content of any Text nodes text << node.to_s if node.class == HTML::Text end # strip any comments, and if they have a newline at the end (ie. line with # only a comment) strip that too text.gsub(/[\n]?/m, "") else html # already plain text 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 :name key will create a # named cycle. You can manually reset a cycle by calling reset_cycle and passing the # name of the cycle. # # ==== Examples # # Alternate CSS classes for even and odd numbers... # @items = [1,2,3,4] # # <% @items.each do |item| %> # "> # # # <% end %> #
item
# # # # 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| %> # "row_class") # # <% item.values.each do |value| %> # # "colors") -%>"> # <%= value %> # # <% end %> # <% reset_cycle("colors") %> # # # <% 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 # 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]] # # <% @items.each do |item| %> # "> # <% item.each do |value| %> # "colors") -%>"> # <%= value %> # # <% end %> # # <% reset_cycle("colors") %> # # <% end %> #
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 to_s value = @values[@index].to_s @index = (@index + 1) % @values.size return value 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:]]|\s|<|$) # 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, href_options = {}) extra_options = tag_options(href_options.stringify_keys) || "" text.gsub(AUTO_LINK_RE) do all, a, b, c, d = $&, $1, $2, $3, $4 if a =~ /#{text}#{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(/]*>(.*)(#{text})(.*)<\/a>/) text else display_text = (block_given?) ? yield(text) : text %{#{display_text}} end end end end end end