require 'action_view/helpers/tag_helper' 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) output_buffer << string end def safe_concat(string) output_buffer.respond_to?(:safe_concat) ? output_buffer.safe_concat(string) : concat(string) end # Truncates a given +text+ after a given :length if +text+ is longer than :length # (defaults to 30). The last characters will be replaced with the :omission (defaults to "...") # for a total length not exceeding :length. # # Pass a :separator to truncate +text+ at a natural break. # # ==== Examples # # truncate("Once upon a time in a world far far away") # # => Once upon a time in a world... # # truncate("Once upon a time in a world far far away", :separator => ' ') # # => Once upon a time in a world... # # 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 t(clipped) # # truncate("And they found that many people were sleeping better.", :omission => "... (continued)", :length => 25) # # => And they f... (continued) # # You can still use truncate 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... # # truncate("And they found that many people were sleeping better.", 25, "... (continued)") # # => And they f... (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 stop = options[:separator] ? (chars.rindex(options[:separator].mb_chars, l) || l) : l (chars.length > options[:length] ? chars[0...stop] + options[:omission] : text).to_s end 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'], :highlighter => '\1') # # => You searched for: rails # # highlight('You searched for: rails', 'rails', :highlighter => '\1') # # => You searched for: rails # # You can still use highlight with the old API that accepts the # +highlighter+ as its optional third parameter: # highlight('You searched for: rails', 'rails', '\1') # => You searched for: rails def highlight(text, phrases, *args) options = args.extract_options! unless args.empty? options[:highlighter] = args[0] || '\1' end options.reverse_merge!(:highlighter => '\1') 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 :radius option expands the excerpt on each side of the first occurrence 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 :omission 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 => ' ') # # => is also an example # # You can still use excerpt 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, ' ') # => 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(\.0+)?$/) ? singular : (plural || singular.pluralize)) end # Wraps the +text+ into lines no longer than +line_width+ width. This method # breaks on the first whitespace character that does not exceed +line_width+ # (which is 80 by default). # # ==== Examples # # word_wrap('Once upon a time') # # => Once upon a time # # word_wrap('Once upon a time, in a kingdom called Far Far Away, a king fell ill, and finding a successor to the throne turned out to be more trouble than anyone could have imagined...') # # => Once upon a time, in a kingdom called Far Far Away, a king fell ill, and finding\n a successor to the throne turned out to be more trouble than anyone could have\n imagined... # # word_wrap('Once upon a time', :line_width => 8) # # => Once upon\na time # # word_wrap('Once upon a time', :line_width => 1) # # => Once\nupon\na\ntime # # You can still use word_wrap with the old API that accepts the # +line_width+ as its optional second parameter: # word_wrap('Once upon a time', 8) # => Once upon\na time def word_wrap(text, *args) options = args.extract_options! unless args.blank? options[:line_width] = args[0] || 80 end options.reverse_merge!(:line_width => 80) text.split("\n").collect do |line| line.length > options[:line_width] ? line.gsub(/(.{1,#{options[:line_width]}})(\s+|$)/, "\\1\n").strip : line end * "\n" end # 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://redcloth.org/] 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.

" # # textilize("This is worded strongly") # # => "

This is worded strongly

" # # textilize("This is worded strongly", :filter_html) # # => "

This is worded <strong>strongly</strong>

" # def textilize(text, *options) options ||= [:hard_breaks] if text.blank? "" else textilized = RedCloth.new(text, options) 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://redcloth.org/] 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 # Returns the text with all the Markdown codes turned into HTML tags. # This method requires BlueCloth[http://www.deveiate.org/projects/BlueCloth] # to be 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 # 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+. # # You can pass any HTML attributes into html_options. 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) # # => "

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

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

We want to put a paragraph...

\n\n

...right there.

" # # simple_format("Look ma! A class!", :class => 'description') # # => "

Look ma! A class!

" def simple_format(text, html_options={}) start_tag = tag('p', html_options, true) text = h(text) text.gsub!(/\r\n?/, "\n") # \r\n and \r -> \n text.gsub!(/\n\n+/, "

\n\n#{start_tag}") # 2+ newline -> paragraph text.gsub!(/([^\n]\n)(?=[^\n])/, '\1
') # 1 newline -> br text.insert 0, start_tag text.safe_concat("

") end # Turns all URLs and e-mail addresses into clickable links. The :link option # will limit what should be linked. You can add HTML attributes to the links using # :html. Possible values 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", :link => :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", :link => :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, :html => { :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." # # # You can still use auto_link 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 http://www.myblog.com. # 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 http://www.myblog.com. # Please e-mail me at me@email.com." def auto_link(text, *args, &block)#link = :all, html = {}, &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), options[:html], &block) when :email_addresses then auto_link_email_addresses(text, options[:html], &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 :name key will create a # named cycle. The default name for a cycle without a +:name+ key is # "default". 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] # # <% @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| %> # <%# Create a named cycle "colors" %> # "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 # Returns the current cycle string after a cycle has been started. Useful # for complex table highlighting 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| %> #
"> # <%= item %> #
# <% 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]] # # <% @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 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{ ( https?:// | www\. ) [^\s<]+ }x unless const_defined?(:AUTO_LINK_RE) BRACKETS = { ']' => '[', ')' => '(', '}' => '{' } # 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 = {}) link_attributes = html_options.stringify_keys text.gsub(AUTO_LINK_RE) do href = $& punctuation = [] left, right = $`, $' # detect already linked URLs and URLs in the middle of a tag if left =~ /<[^>]+$/ && right =~ /^[^>]*>/ # do not change string; URL is already linked href else # don't include trailing punctuation character as part of the URL while href.sub!(/[^\w\/-]$/, '') punctuation.push $& if opening = BRACKETS[punctuation.last] and href.scan(opening).size > href.scan(punctuation.last).size href << punctuation.pop break end end link_text = block_given?? yield(href) : href href = 'http://' + href unless href =~ %r{^[a-z]+://}i content_tag(:a, h(link_text), link_attributes.merge('href' => href)) + punctuation.reverse.join('') 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, html_options = {}) body = text.dup text.gsub(/([\w\.!#\$%\-+.]+@[A-Za-z0-9\-]+(\.[A-Za-z0-9\-]+)+)/) do text = $1 if body.match(/]*>(.*)(#{Regexp.escape(text)})(.*)<\/a>/) text else display_text = (block_given?) ? yield(text) : text mail_to text, display_text, html_options end end end end end end