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module ActionView
module Helpers #:nodoc:
# Provides a set of methods for working with text strings that can help unburden the level of inline Ruby code in the
# templates. In the example below we iterate over a collection of posts provided to the template and prints each title
# after making sure it doesn't run longer than 20 characters:
# <% for post in @posts %>
# Title: <%= truncate(post.title, 20) %>
# <% end %>
module TextHelper
# The regular puts and print are outlawed in eRuby. It's recommended to use the <%= "hello" %> form instead of print "hello".
# If you absolutely must use a method-based output, you can use concat. It's use like this <% concat "hello", binding %>. Notice that
# it doesn't have an equal sign in front. Using <%= concat "hello" %> would result in a double hello.
def concat(string, binding)
eval("_erbout", binding).concat(string)
end
# Truncates +text+ to the length of +length+ and replaces the last three characters with the +truncate_string+
# if the +text+ is longer than +length+.
def truncate(text, length = 30, truncate_string = "...")
if text.nil? then return end
if text.length > length then text[0..(length - 3)] + truncate_string else text end
end
# Highlights the +phrase+ where it is found in the +text+ by surrounding it like
# <strong class="highlight">I'm a highlight phrase</strong>. The highlighter can be specialized by
# passing +highlighter+ as single-quoted string with \1 where the phrase is supposed to be inserted.
# N.B.: The +phrase+ is sanitized to include only letters, digits, and spaces before use.
def highlight(text, phrase, highlighter = '<strong class="highlight">\1</strong>')
if text.nil? || phrase.nil? then return end
text.gsub(/(#{escape_regexp(phrase)})/i, highlighter) unless text.nil?
end
# Extracts an excerpt from the +text+ surrounding the +phrase+ with a number of characters on each side determined
# by +radius+. If the phrase isn't found, nil is returned. Ex:
# excerpt("hello my world", "my", 3) => "...lo my wo..."
def excerpt(text, phrase, radius = 100, excerpt_string = "...")
if text.nil? || phrase.nil? then return end
phrase = escape_regexp(phrase)
if found_pos = text =~ /(#{phrase})/i
start_pos = [ found_pos - radius, 0 ].max
end_pos = [ found_pos + phrase.length + radius, text.length ].min
prefix = start_pos > 0 ? excerpt_string : ""
postfix = end_pos < text.length ? excerpt_string : ""
prefix + text[start_pos..end_pos].strip + postfix
else
nil
end
end
# Attempts to pluralize the +singular+ word unless +count+ is 1. See source for pluralization rules.
def pluralize(count, singular, plural = nil)
"#{count} " + if count == 1
singular
elsif plural
plural
elsif Object.const_defined?("Inflector")
Inflector.pluralize(singular)
else
singular + "s"
end
end
begin
require "redcloth"
# Returns the text with all the Textile codes turned into HTML-tags.
# <i>This method is only available if RedCloth can be required</i>.
def textilize(text)
text.blank? ? "" : RedCloth.new(text, [ :hard_breaks ]).to_html
end
# Returns the text with all the Textile codes turned into HTML-tags, but without the regular bounding <p> tag.
# <i>This method is only available if RedCloth can be required</i>.
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 "bluecloth"
# Returns the text with all the Markdown codes turned into HTML-tags.
# <i>This method is only available if BlueCloth can be required</i>.
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 very simple formatting rules
# Surrounds paragraphs with <tt>&lt;p&gt;</tt> tags, and converts line breaks into <tt>&lt;br /&gt;</tt>
# Two consecutive newlines(<tt>\n\n</tt>) are considered as a paragraph, one newline (<tt>\n</tt>) is
# considered a linebreak, three or more consecutive newlines are turned into two newlines
def simple_format(text)
text.gsub!(/(\r\n|\n|\r)/, "\n") # lets make them newlines crossplatform
text.gsub!(/\n\n+/, "\n\n") # zap dupes
text.gsub!(/\n\n/, '</p>\0<p>') # turn two newlines into paragraph
text.gsub!(/([^\n])(\n)([^\n])/, '\1\2<br />\3') # turn single newline into <br />
return '<p>' + text + '</p>' # wrap the first and last line in paragraphs before we're done
end
# Turns all urls and email addresses into clickable links. The +link+ parameter can limit what should be linked.
# Options are :all (default), :email_addresses, and :urls.
#
# Example:
# auto_link("Go to http://www.rubyonrails.com and say hello to david@loudthinking.com") =>
# Go to <a href="http://www.rubyonrails.com">http://www.rubyonrails.com</a> and
# say hello to <a href="mailto:david@loudthinking.com">david@loudthinking.com</a>
def auto_link(text, link = :all)
case link
when :all then auto_link_urls(auto_link_email_addresses(text))
when :email_addresses then auto_link_email_addresses(text)
when :urls then auto_link_urls(text)
end
end
# Turns all links into words, like "<a href="something">else</a>" to "else".
def strip_links(text)
text.gsub(/<a.*>(.*)<\/a>/m, '\1')
end
# Try to require the html-scanner library
begin
require 'html/tokenizer'
require 'html/node'
rescue LoadError
# if there isn't a copy installed, use the vendor version in
# action controller
$:.unshift File.join(File.dirname(__FILE__), "..", "..",
"action_controller", "vendor", "html-scanner")
require 'html/tokenizer'
require 'html/node'
end
VERBOTEN_TAGS = %w(form script) unless defined?(VERBOTEN_TAGS)
VERBOTEN_ATTRS = /^on/i unless defined?(VERBOTEN_ATTRS)
# Sanitizes the given HTML by making form and script tags into regular
# text, and removing all "onxxx" attributes (so that arbitrary Javascript
# cannot be executed). Also removes href attributes that start with
# "javascript:".
#
# Returns the sanitized text.
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(/</, "&lt;")
else
if node.closing != :close
node.attributes.delete_if { |attr,v| attr =~ VERBOTEN_ATTRS }
if node.attributes["href"] =~ /^javascript:/i
node.attributes.delete "href"
end
end
node.to_s
end
else
node.to_s.gsub(/</, "&lt;")
end
end
html = new_text
end
html
end
private
# Returns a version of the text that's safe to use in a regular expression without triggering engine features.
def escape_regexp(text)
text.gsub(/([\\|?+*\/\)\(])/) { |m| "\\#{$1}" }
end
# Turns all urls into clickable links.
def auto_link_urls(text)
text.gsub(/(<\w+.*?>|[^=!:'"\/]|^)((?:http[s]?:\/\/)|(?:www\.))([^\s<]+\/?)([[:punct:]]|\s|<|$)/) 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
%(#{a}<a href="#{b=="www."?"http://www.":b}#{c}">#{b}#{c}</a>#{d})
end
end
end
# Turns all email addresses into clickable links.
def auto_link_email_addresses(text)
text.gsub(/([\w\.!#\$%\-+.]+@[A-Za-z0-9\-]+(\.[A-Za-z0-9\-]+)+)/, '<a href="mailto:\1">\1</a>')
end
end
end
end
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