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Diffstat (limited to 'actionpack/lib/action_view/helpers/text_helper.rb')
| -rw-r--r-- | actionpack/lib/action_view/helpers/text_helper.rb | 442 |
1 files changed, 0 insertions, 442 deletions
diff --git a/actionpack/lib/action_view/helpers/text_helper.rb b/actionpack/lib/action_view/helpers/text_helper.rb deleted file mode 100644 index 147f9fd8ed..0000000000 --- a/actionpack/lib/action_view/helpers/text_helper.rb +++ /dev/null @@ -1,442 +0,0 @@ -require 'active_support/core_ext/string/filters' -require 'active_support/core_ext/array/extract_options' - -module ActionView - # = Action View Text Helpers - 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 Action View making them callable - # within your template files. - # - # ==== Sanitization - # - # Most text helpers by default sanitize the given content, but do not escape it. - # This means HTML tags will appear in the page but all malicious code will be removed. - # Let's look at some examples using the +simple_format+ method: - # - # simple_format('<a href="http://example.com/">Example</a>') - # # => "<p><a href=\"http://example.com/\">Example</a></p>" - # - # simple_format('<a href="javascript:alert(\'no!\')">Example</a>') - # # => "<p><a>Example</a></p>" - # - # If you want to escape all content, you should invoke the +h+ method before - # calling the text helper. - # - # simple_format h('<a href="http://example.com/">Example</a>') - # # => "<p><a href=\"http://example.com/\">Example</a></p>" - module TextHelper - extend ActiveSupport::Concern - - include SanitizeHelper - include TagHelper - # 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. - # - # <% - # concat "hello" - # # is the equivalent of <%= "hello" %> - # - # if logged_in - # 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 <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 "...") - # for a total length not exceeding <tt>:length</tt>. - # - # Pass a <tt>:separator</tt> to truncate +text+ at a natural break. - # - # Pass a block if you want to show extra content when the text is truncated. - # - # The result is marked as HTML-safe, but it is escaped by default, unless <tt>:escape</tt> is - # +false+. Care should be taken if +text+ contains HTML tags or entities, because truncation - # may produce invalid HTML (such as unbalanced or incomplete tags). - # - # 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", length: 17) - # # => "Once upon a ti..." - # - # truncate("Once upon a time in a world far far away", length: 17, separator: ' ') - # # => "Once upon a..." - # - # truncate("And they found that many people were sleeping better.", length: 25, omission: '... (continued)') - # # => "And they f... (continued)" - # - # truncate("<p>Once upon a time in a world far far away</p>") - # # => "<p>Once upon a time in a wo..." - # - # truncate("Once upon a time in a world far far away") { link_to "Continue", "#" } - # # => "Once upon a time in a wo...<a href="#">Continue</a>" - def truncate(text, options = {}, &block) - if text - length = options.fetch(:length, 30) - - content = text.truncate(length, options) - content = options[:escape] == false ? content.html_safe : ERB::Util.html_escape(content) - content << capture(&block) if block_given? && text.length > length - content - 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 <tt>\1</tt> where the phrase is to be inserted (defaults to - # '<mark>\1</mark>') - # - # highlight('You searched for: rails', 'rails') - # # => You searched for: <mark>rails</mark> - # - # 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> - def highlight(text, phrases, options = {}) - text = sanitize(text) if options.fetch(:sanitize, true) - - if text.blank? || phrases.blank? - text - else - highlighter = options.fetch(:highlighter, '<mark>\1</mark>') - match = Array(phrases).map { |p| Regexp.escape(p) }.join('|') - text.gsub(/(#{match})(?![^<]*?>)/i, highlighter) - end.html_safe - 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. Use the - # <tt>:separator</tt> option to choose the delimitation. The resulting string will be stripped in any case. If the +phrase+ - # isn't found, nil is returned. - # - # 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 - # - # excerpt('This is a very beautiful morning', 'very', separator: ' ', radius: 1) - # # => ...a very beautiful... - def excerpt(text, phrase, options = {}) - return unless text && phrase - - separator = options.fetch(:separator, "") - phrase = Regexp.escape(phrase) - regex = /#{phrase}/i - - return unless matches = text.match(regex) - phrase = matches[0] - - text.split(separator).each do |value| - if value.match(regex) - regex = phrase = value - break - end - end - - first_part, second_part = text.split(regex, 2) - - prefix, first_part = cut_excerpt_part(:first, first_part, separator, options) - postfix, second_part = cut_excerpt_part(:second, second_part, separator, options) - - prefix + (first_part + separator + phrase + separator + second_part).strip + postfix - 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. - # - # 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) - word = if (count == 1 || count =~ /^1(\.0+)?$/) - singular - else - plural || singular.pluralize - end - - "#{count || 0} #{word}" - end - - # Wraps the +text+ into lines no longer than +line_width+ width. This method - # breaks on the first whitespace character that does not exceed +line_width+ - # (which is 80 by default). - # - # word_wrap('Once upon a time') - # # => Once upon a time - # - # word_wrap('Once upon a time, in a kingdom called Far Far Away, a king fell ill, and finding a successor to the throne turned out to be more trouble than anyone could have imagined...') - # # => Once upon a time, in a kingdom called Far Far Away, a king fell ill, and finding\na successor to the throne turned out to be more trouble than anyone could have\nimagined... - # - # word_wrap('Once upon a time', line_width: 8) - # # => Once\nupon a\ntime - # - # word_wrap('Once upon a time', line_width: 1) - # # => Once\nupon\na\ntime - def word_wrap(text, options = {}) - line_width = options.fetch(:line_width, 80) - - text.split("\n").collect do |line| - line.length > line_width ? line.gsub(/(.{1,#{line_width}})(\s+|$)/, "\\1\n").strip : line - end * "\n" - 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. - # - # ==== Options - # * <tt>:sanitize</tt> - If +false+, does not sanitize +text+. - # * <tt>:wrapper_tag</tt> - String representing the wrapper tag, defaults to <tt>"p"</tt> - # - # ==== 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>" - # - # simple_format(my_text, {}, wrapper_tag: "div") - # # => "<div>Here is some basic text...\n<br />...with a line break.</div>" - # - # 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>" - # - # simple_format("<blink>Unblinkable.</blink>") - # # => "<p>Unblinkable.</p>" - # - # simple_format("<blink>Blinkable!</blink> It's true.", {}, sanitize: false) - # # => "<p><blink>Blinkable!</span> It's true.</p>" - def simple_format(text, html_options = {}, options = {}) - wrapper_tag = options.fetch(:wrapper_tag, :p) - - text = sanitize(text) if options.fetch(:sanitize, true) - paragraphs = split_paragraphs(text) - - if paragraphs.empty? - content_tag(wrapper_tag, nil, html_options) - else - paragraphs.map { |paragraph| - content_tag(wrapper_tag, paragraph, html_options, options[:sanitize]) - }.join("\n\n").html_safe - 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. - # - # # Alternate CSS classes for even and odd numbers... - # @items = [1,2,3,4] - # <table> - # <% @items.each do |item| %> - # <tr class="<%= cycle("odd", "even") -%>"> - # <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("odd", "even", 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) - options = values.extract_options! - name = options.fetch(:name, 'default') - - values.unshift(first_value) - - cycle = get_cycle(name) - unless cycle && cycle.values == values - cycle = set_cycle(name, Cycle.new(*values)) - end - 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. - # - # # 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 if cycle - 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. - # - # # 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 if cycle - 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 - - def split_paragraphs(text) - return [] if text.blank? - - text.to_str.gsub(/\r\n?/, "\n").split(/\n\n+/).map! do |t| - t.gsub!(/([^\n]\n)(?=[^\n])/, '\1<br />') || t - end - end - - def cut_excerpt_part(part_position, part, separator, options) - return "", "" unless part - - radius = options.fetch(:radius, 100) - omission = options.fetch(:omission, "...") - - part = part.split(separator) - part.delete("") - affix = part.size > radius ? omission : "" - - part = if part_position == :first - drop_index = [part.length - radius, 0].max - part.drop(drop_index) - else - part.first(radius) - end - - return affix, part.join(separator) - end - end - end -end |