418 lines
17 KiB
Ruby
418 lines
17 KiB
Ruby
require 'active_support/core_ext/object/blank'
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require 'active_support/core_ext/string/filters'
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require 'action_view/helpers/tag_helper'
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module ActionView
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# = Action View Text Helpers
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module Helpers #:nodoc:
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# The TextHelper module provides a set of methods for filtering, formatting
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# and transforming strings, which can reduce the amount of inline Ruby code in
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# your views. These helper methods extend Action View making them callable
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# within your template files.
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#
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# ==== Sanitization
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#
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# Most text helpers by default sanitize the given content, but do not escape it.
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# This means HTML tags will appear in the page but all malicious code will be removed.
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# Let's look at some examples using the +simple_format+ method:
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#
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# simple_format('<a href="http://example.com/">Example</a>')
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# # => "<p><a href=\"http://example.com/\">Example</a></p>"
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#
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# simple_format('<a href="javascript:alert(\'no!\')">Example</a>')
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# # => "<p><a>Example</a></p>"
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#
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# If you want to escape all content, you should invoke the +h+ method before
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# calling the text helper.
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#
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# simple_format h('<a href="http://example.com/">Example</a>')
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# # => "<p><a href=\"http://example.com/\">Example</a></p>"
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module TextHelper
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extend ActiveSupport::Concern
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include SanitizeHelper
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# The preferred method of outputting text in your views is to use the
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# <%= "text" %> eRuby syntax. The regular _puts_ and _print_ methods
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# do not operate as expected in an eRuby code block. If you absolutely must
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# output text within a non-output code block (i.e., <% %>), you can use the concat method.
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#
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# ==== Examples
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# <%
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# concat "hello"
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# # is the equivalent of <%= "hello" %>
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#
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# if logged_in
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# concat "Logged in!"
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# else
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# concat link_to('login', :action => login)
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# end
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# # will either display "Logged in!" or a login link
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# %>
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def concat(string)
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output_buffer << string
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end
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def safe_concat(string)
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output_buffer.respond_to?(:safe_concat) ? output_buffer.safe_concat(string) : concat(string)
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end
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# Truncates a given +text+ after a given <tt>:length</tt> if +text+ is longer than <tt>:length</tt>
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# (defaults to 30). The last characters will be replaced with the <tt>:omission</tt> (defaults to "...")
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# for a total length not exceeding <tt>:length</tt>.
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#
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# Pass a <tt>:separator</tt> to truncate +text+ at a natural break.
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#
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# The result is not marked as HTML-safe, so will be subject to the default escaping when
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# used in views, unless wrapped by <tt>raw()</tt>. Care should be taken if +text+ contains HTML tags
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# or entities, because truncation may produce invalid HTML (such as unbalanced or incomplete tags).
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#
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# ==== Examples
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#
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# truncate("Once upon a time in a world far far away")
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# # => "Once upon a time in a world..."
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#
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# truncate("Once upon a time in a world far far away", :length => 17)
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# # => "Once upon a ti..."
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#
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# truncate("Once upon a time in a world far far away", :length => 17, :separator => ' ')
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# # => "Once upon a..."
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#
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# truncate("And they found that many people were sleeping better.", :length => 25, :omission => '... (continued)')
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# # => "And they f... (continued)"
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#
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# truncate("<p>Once upon a time in a world far far away</p>")
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# # => "<p>Once upon a time in a wo..."
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def truncate(text, options = {})
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options.reverse_merge!(:length => 30)
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text.truncate(options.delete(:length), options) if text
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end
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# Highlights one or more +phrases+ everywhere in +text+ by inserting it into
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# a <tt>:highlighter</tt> string. The highlighter can be specialized by passing <tt>:highlighter</tt>
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# as a single-quoted string with \1 where the phrase is to be inserted (defaults to
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# '<strong class="highlight">\1</strong>')
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#
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# ==== Examples
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# highlight('You searched for: rails', 'rails')
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# # => You searched for: <strong class="highlight">rails</strong>
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#
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# highlight('You searched for: ruby, rails, dhh', 'actionpack')
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# # => You searched for: ruby, rails, dhh
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#
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# highlight('You searched for: rails', ['for', 'rails'], :highlighter => '<em>\1</em>')
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# # => You searched <em>for</em>: <em>rails</em>
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#
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# highlight('You searched for: rails', 'rails', :highlighter => '<a href="search?q=\1">\1</a>')
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# # => You searched for: <a href="search?q=rails">rails</a>
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#
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# You can still use <tt>highlight</tt> with the old API that accepts the
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# +highlighter+ as its optional third parameter:
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# highlight('You searched for: rails', 'rails', '<a href="search?q=\1">\1</a>') # => You searched for: <a href="search?q=rails">rails</a>
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def highlight(text, phrases, *args)
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options = args.extract_options!
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unless args.empty?
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options[:highlighter] = args[0] || '<strong class="highlight">\1</strong>'
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end
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options.reverse_merge!(:highlighter => '<strong class="highlight">\1</strong>')
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text = sanitize(text) unless options[:sanitize] == false
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if text.blank? || phrases.blank?
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text
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else
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match = Array(phrases).map { |p| Regexp.escape(p) }.join('|')
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text.gsub(/(#{match})(?!(?:[^<]*?)(?:["'])[^<>]*>)/i, options[:highlighter])
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end.html_safe
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end
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# Extracts an excerpt from +text+ that matches the first instance of +phrase+.
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# The <tt>:radius</tt> option expands the excerpt on each side of the first occurrence of +phrase+ by the number of characters
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# defined in <tt>:radius</tt> (which defaults to 100). If the excerpt radius overflows the beginning or end of the +text+,
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# then the <tt>:omission</tt> option (which defaults to "...") will be prepended/appended accordingly. The resulting string
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# will be stripped in any case. If the +phrase+ isn't found, nil is returned.
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#
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# ==== Examples
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# excerpt('This is an example', 'an', :radius => 5)
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# # => ...s is an exam...
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#
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# excerpt('This is an example', 'is', :radius => 5)
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# # => This is a...
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#
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# excerpt('This is an example', 'is')
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# # => This is an example
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#
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# excerpt('This next thing is an example', 'ex', :radius => 2)
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# # => ...next...
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#
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# excerpt('This is also an example', 'an', :radius => 8, :omission => '<chop> ')
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# # => <chop> is also an example
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#
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# You can still use <tt>excerpt</tt> with the old API that accepts the
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# +radius+ as its optional third and the +ellipsis+ as its
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# optional forth parameter:
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# excerpt('This is an example', 'an', 5) # => ...s is an exam...
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# excerpt('This is also an example', 'an', 8, '<chop> ') # => <chop> is also an example
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def excerpt(text, phrase, *args)
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return unless text && phrase
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options = args.extract_options!
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unless args.empty?
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options[:radius] = args[0] || 100
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options[:omission] = args[1] || "..."
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end
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options.reverse_merge!(:radius => 100, :omission => "...")
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phrase = Regexp.escape(phrase)
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return unless found_pos = text.mb_chars =~ /(#{phrase})/i
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start_pos = [ found_pos - options[:radius], 0 ].max
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end_pos = [ [ found_pos + phrase.mb_chars.length + options[:radius] - 1, 0].max, text.mb_chars.length ].min
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prefix = start_pos > 0 ? options[:omission] : ""
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postfix = end_pos < text.mb_chars.length - 1 ? options[:omission] : ""
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prefix + text.mb_chars[start_pos..end_pos].strip + postfix
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end
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# Attempts to pluralize the +singular+ word unless +count+ is 1. If
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# +plural+ is supplied, it will use that when count is > 1, otherwise
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# it will use the Inflector to determine the plural form
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#
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# ==== Examples
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# pluralize(1, 'person')
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# # => 1 person
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#
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# pluralize(2, 'person')
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# # => 2 people
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#
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# pluralize(3, 'person', 'users')
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# # => 3 users
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#
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# pluralize(0, 'person')
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# # => 0 people
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def pluralize(count, singular, plural = nil)
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"#{count || 0} " + ((count == 1 || count =~ /^1(\.0+)?$/) ? singular : (plural || singular.pluralize))
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end
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# Wraps the +text+ into lines no longer than +line_width+ width. This method
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# breaks on the first whitespace character that does not exceed +line_width+
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# (which is 80 by default).
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#
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# ==== Examples
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#
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# word_wrap('Once upon a time')
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# # => Once upon a time
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#
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# 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...')
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# # => 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...
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#
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# word_wrap('Once upon a time', :line_width => 8)
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# # => Once upon\na time
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#
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# word_wrap('Once upon a time', :line_width => 1)
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# # => Once\nupon\na\ntime
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#
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# You can still use <tt>word_wrap</tt> with the old API that accepts the
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# +line_width+ as its optional second parameter:
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# word_wrap('Once upon a time', 8) # => Once upon\na time
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def word_wrap(text, *args)
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options = args.extract_options!
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unless args.blank?
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options[:line_width] = args[0] || 80
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end
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options.reverse_merge!(:line_width => 80)
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text.split("\n").collect do |line|
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line.length > options[:line_width] ? line.gsub(/(.{1,#{options[:line_width]}})(\s+|$)/, "\\1\n").strip : line
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end * "\n"
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end
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# Returns +text+ transformed into HTML using simple formatting rules.
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# Two or more consecutive newlines(<tt>\n\n</tt>) are considered as a
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# paragraph and wrapped in <tt><p></tt> tags. One newline (<tt>\n</tt>) is
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# considered as a linebreak and a <tt><br /></tt> tag is appended. This
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# method does not remove the newlines from the +text+.
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#
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# You can pass any HTML attributes into <tt>html_options</tt>. These
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# will be added to all created paragraphs.
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#
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# ==== Options
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# * <tt>:sanitize</tt> - If +false+, does not sanitize +text+.
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#
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# ==== Examples
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# my_text = "Here is some basic text...\n...with a line break."
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#
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# simple_format(my_text)
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# # => "<p>Here is some basic text...\n<br />...with a line break.</p>"
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#
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# more_text = "We want to put a paragraph...\n\n...right there."
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#
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# simple_format(more_text)
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# # => "<p>We want to put a paragraph...</p>\n\n<p>...right there.</p>"
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#
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# simple_format("Look ma! A class!", :class => 'description')
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# # => "<p class='description'>Look ma! A class!</p>"
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#
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# simple_format("<span>I'm allowed!</span> It's true.", {}, :sanitize => false)
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# # => "<p><span>I'm allowed!</span> It's true.</p>"
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def simple_format(text, html_options={}, options={})
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text = '' if text.nil?
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text = text.dup
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start_tag = tag('p', html_options, true)
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text = sanitize(text) unless options[:sanitize] == false
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text = text.to_str
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text.gsub!(/\r\n?/, "\n") # \r\n and \r -> \n
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text.gsub!(/\n\n+/, "</p>\n\n#{start_tag}") # 2+ newline -> paragraph
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text.gsub!(/([^\n]\n)(?=[^\n])/, '\1<br />') # 1 newline -> br
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text.insert 0, start_tag
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text.html_safe.safe_concat("</p>")
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end
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# Creates a Cycle object whose _to_s_ method cycles through elements of an
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# array every time it is called. This can be used for example, to alternate
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# classes for table rows. You can use named cycles to allow nesting in loops.
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# Passing a Hash as the last parameter with a <tt>:name</tt> key will create a
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# named cycle. The default name for a cycle without a +:name+ key is
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# <tt>"default"</tt>. You can manually reset a cycle by calling reset_cycle
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# and passing the name of the cycle. The current cycle string can be obtained
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# anytime using the current_cycle method.
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#
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# ==== Examples
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# # Alternate CSS classes for even and odd numbers...
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# @items = [1,2,3,4]
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# <table>
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# <% @items.each do |item| %>
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# <tr class="<%= cycle("odd", "even") -%>">
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# <td>item</td>
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# </tr>
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# <% end %>
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# </table>
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#
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#
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# # Cycle CSS classes for rows, and text colors for values within each row
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# @items = x = [{:first => 'Robert', :middle => 'Daniel', :last => 'James'},
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# {:first => 'Emily', :middle => 'Shannon', :maiden => 'Pike', :last => 'Hicks'},
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# {:first => 'June', :middle => 'Dae', :last => 'Jones'}]
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# <% @items.each do |item| %>
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# <tr class="<%= cycle("odd", "even", :name => "row_class") -%>">
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# <td>
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# <% item.values.each do |value| %>
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# <%# Create a named cycle "colors" %>
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# <span style="color:<%= cycle("red", "green", "blue", :name => "colors") -%>">
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# <%= value %>
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# </span>
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# <% end %>
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# <% reset_cycle("colors") %>
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# </td>
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# </tr>
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# <% end %>
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def cycle(first_value, *values)
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if (values.last.instance_of? Hash)
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params = values.pop
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name = params[:name]
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else
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name = "default"
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end
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values.unshift(first_value)
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cycle = get_cycle(name)
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unless cycle && cycle.values == values
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cycle = set_cycle(name, Cycle.new(*values))
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end
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cycle.to_s
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end
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# Returns the current cycle string after a cycle has been started. Useful
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# for complex table highlighting or any other design need which requires
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# the current cycle string in more than one place.
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#
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# ==== Example
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# # Alternate background colors
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# @items = [1,2,3,4]
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# <% @items.each do |item| %>
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# <div style="background-color:<%= cycle("red","white","blue") %>">
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# <span style="background-color:<%= current_cycle %>"><%= item %></span>
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# </div>
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# <% end %>
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def current_cycle(name = "default")
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cycle = get_cycle(name)
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cycle.current_value if cycle
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end
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# Resets a cycle so that it starts from the first element the next time
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# it is called. Pass in +name+ to reset a named cycle.
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#
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# ==== Example
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# # Alternate CSS classes for even and odd numbers...
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# @items = [[1,2,3,4], [5,6,3], [3,4,5,6,7,4]]
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# <table>
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# <% @items.each do |item| %>
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# <tr class="<%= cycle("even", "odd") -%>">
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# <% item.each do |value| %>
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# <span style="color:<%= cycle("#333", "#666", "#999", :name => "colors") -%>">
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# <%= value %>
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# </span>
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# <% end %>
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#
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# <% reset_cycle("colors") %>
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# </tr>
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# <% end %>
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# </table>
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def reset_cycle(name = "default")
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cycle = get_cycle(name)
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cycle.reset if cycle
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end
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class Cycle #:nodoc:
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attr_reader :values
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def initialize(first_value, *values)
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@values = values.unshift(first_value)
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reset
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end
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def reset
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@index = 0
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end
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def current_value
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@values[previous_index].to_s
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end
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def to_s
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value = @values[@index].to_s
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@index = next_index
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return value
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end
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private
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def next_index
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step_index(1)
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end
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def previous_index
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step_index(-1)
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end
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def step_index(n)
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(@index + n) % @values.size
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end
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end
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private
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# The cycle helpers need to store the cycles in a place that is
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# guaranteed to be reset every time a page is rendered, so it
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# uses an instance variable of ActionView::Base.
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def get_cycle(name)
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@_cycles = Hash.new unless defined?(@_cycles)
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return @_cycles[name]
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end
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def set_cycle(name, cycle_object)
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@_cycles = Hash.new unless defined?(@_cycles)
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@_cycles[name] = cycle_object
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end
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end
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end
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end
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