From 0d6e8edc2a47a4b4c6824936632bfb83850db343 Mon Sep 17 00:00:00 2001
From: Piotr Sarnacki <drogus@gmail.com>
Date: Sat, 4 May 2013 15:09:22 +0200
Subject: Move actionpack/lib/action_view* into actionview/lib

---
 actionview/lib/action_view/helpers/tag_helper.rb | 176 +++++++++++++++++++++++
 1 file changed, 176 insertions(+)
 create mode 100644 actionview/lib/action_view/helpers/tag_helper.rb

(limited to 'actionview/lib/action_view/helpers/tag_helper.rb')

diff --git a/actionview/lib/action_view/helpers/tag_helper.rb b/actionview/lib/action_view/helpers/tag_helper.rb
new file mode 100644
index 0000000000..732f35643a
--- /dev/null
+++ b/actionview/lib/action_view/helpers/tag_helper.rb
@@ -0,0 +1,176 @@
+require 'active_support/core_ext/string/output_safety'
+require 'set'
+
+module ActionView
+  # = Action View Tag Helpers
+  module Helpers #:nodoc:
+    # Provides methods to generate HTML tags programmatically when you can't use
+    # a Builder. By default, they output XHTML compliant tags.
+    module TagHelper
+      extend ActiveSupport::Concern
+      include CaptureHelper
+
+      BOOLEAN_ATTRIBUTES = %w(disabled readonly multiple checked autobuffer
+                           autoplay controls loop selected hidden scoped async
+                           defer reversed ismap seamless muted required
+                           autofocus novalidate formnovalidate open pubdate
+                           itemscope allowfullscreen default inert sortable
+                           truespeed typemustmatch).to_set
+
+      BOOLEAN_ATTRIBUTES.merge(BOOLEAN_ATTRIBUTES.map {|attribute| attribute.to_sym })
+
+      PRE_CONTENT_STRINGS = {
+        :textarea => "\n"
+      }
+
+      # Returns an empty HTML tag of type +name+ which by default is XHTML
+      # compliant. Set +open+ to true to create an open tag compatible
+      # with HTML 4.0 and below. Add HTML attributes by passing an attributes
+      # hash to +options+. Set +escape+ to false to disable attribute value
+      # escaping.
+      #
+      # ==== Options
+      # You can use symbols or strings for the attribute names.
+      #
+      # Use +true+ with boolean attributes that can render with no value, like
+      # +disabled+ and +readonly+.
+      #
+      # HTML5 <tt>data-*</tt> attributes can be set with a single +data+ key
+      # pointing to a hash of sub-attributes.
+      #
+      # To play nicely with JavaScript conventions sub-attributes are dasherized.
+      # For example, a key +user_id+ would render as <tt>data-user-id</tt> and
+      # thus accessed as <tt>dataset.userId</tt>.
+      #
+      # Values are encoded to JSON, with the exception of strings and symbols.
+      # This may come in handy when using jQuery's HTML5-aware <tt>.data()</tt>
+      # from 1.4.3.
+      #
+      # ==== Examples
+      #   tag("br")
+      #   # => <br />
+      #
+      #   tag("br", nil, true)
+      #   # => <br>
+      #
+      #   tag("input", type: 'text', disabled: true)
+      #   # => <input type="text" disabled="disabled" />
+      #
+      #   tag("img", src: "open & shut.png")
+      #   # => <img src="open &amp; shut.png" />
+      #
+      #   tag("img", {src: "open &amp; shut.png"}, false, false)
+      #   # => <img src="open &amp; shut.png" />
+      #
+      #   tag("div", data: {name: 'Stephen', city_state: %w(Chicago IL)})
+      #   # => <div data-name="Stephen" data-city-state="[&quot;Chicago&quot;,&quot;IL&quot;]" />
+      def tag(name, options = nil, open = false, escape = true)
+        "<#{name}#{tag_options(options, escape) if options}#{open ? ">" : " />"}".html_safe
+      end
+
+      # Returns an HTML block tag of type +name+ surrounding the +content+. Add
+      # HTML attributes by passing an attributes hash to +options+.
+      # Instead of passing the content as an argument, you can also use a block
+      # in which case, you pass your +options+ as the second parameter.
+      # Set escape to false to disable attribute value escaping.
+      #
+      # ==== Options
+      # The +options+ hash is used with attributes with no value like (<tt>disabled</tt> and
+      # <tt>readonly</tt>), which you can give a value of true in the +options+ hash. You can use
+      # symbols or strings for the attribute names.
+      #
+      # ==== Examples
+      #   content_tag(:p, "Hello world!")
+      #    # => <p>Hello world!</p>
+      #   content_tag(:div, content_tag(:p, "Hello world!"), class: "strong")
+      #    # => <div class="strong"><p>Hello world!</p></div>
+      #   content_tag("select", options, multiple: true)
+      #    # => <select multiple="multiple">...options...</select>
+      #
+      #   <%= content_tag :div, class: "strong" do -%>
+      #     Hello world!
+      #   <% end -%>
+      #    # => <div class="strong">Hello world!</div>
+      def content_tag(name, content_or_options_with_block = nil, options = nil, escape = true, &block)
+        if block_given?
+          options = content_or_options_with_block if content_or_options_with_block.is_a?(Hash)
+          content_tag_string(name, capture(&block), options, escape)
+        else
+          content_tag_string(name, content_or_options_with_block, options, escape)
+        end
+      end
+
+      # Returns a CDATA section with the given +content+. CDATA sections
+      # are used to escape blocks of text containing characters which would
+      # otherwise be recognized as markup. CDATA sections begin with the string
+      # <tt><![CDATA[</tt> and end with (and may not contain) the string <tt>]]></tt>.
+      #
+      #   cdata_section("<hello world>")
+      #   # => <![CDATA[<hello world>]]>
+      #
+      #   cdata_section(File.read("hello_world.txt"))
+      #   # => <![CDATA[<hello from a text file]]>
+      #
+      #   cdata_section("hello]]>world")
+      #   # => <![CDATA[hello]]]]><![CDATA[>world]]>
+      def cdata_section(content)
+        splitted = content.gsub(']]>', ']]]]><![CDATA[>')
+        "<![CDATA[#{splitted}]]>".html_safe
+      end
+
+      # Returns an escaped version of +html+ without affecting existing escaped entities.
+      #
+      #   escape_once("1 < 2 &amp; 3")
+      #   # => "1 &lt; 2 &amp; 3"
+      #
+      #   escape_once("&lt;&lt; Accept & Checkout")
+      #   # => "&lt;&lt; Accept &amp; Checkout"
+      def escape_once(html)
+        ERB::Util.html_escape_once(html)
+      end
+
+      private
+
+        def content_tag_string(name, content, options, escape = true)
+          tag_options = tag_options(options, escape) if options
+          content     = ERB::Util.h(content) if escape
+          "<#{name}#{tag_options}>#{PRE_CONTENT_STRINGS[name.to_sym]}#{content}</#{name}>".html_safe
+        end
+
+        def tag_options(options, escape = true)
+          return if options.blank?
+          attrs = []
+          options.each_pair do |key, value|
+            if key.to_s == 'data' && value.is_a?(Hash)
+              value.each_pair do |k, v|
+                attrs << data_tag_option(k, v, escape)
+              end
+            elsif BOOLEAN_ATTRIBUTES.include?(key)
+              attrs << boolean_tag_option(key) if value
+            elsif !value.nil?
+              attrs << tag_option(key, value, escape)
+            end
+          end
+          " #{attrs.sort! * ' '}".html_safe unless attrs.empty?
+        end
+
+        def data_tag_option(key, value, escape)
+          key   = "data-#{key.to_s.dasherize}"
+          unless value.is_a?(String) || value.is_a?(Symbol) || value.is_a?(BigDecimal)
+            value = value.to_json
+          end
+          tag_option(key, value, escape)
+        end
+
+        def boolean_tag_option(key)
+          %(#{key}="#{key}")
+        end
+
+        def tag_option(key, value, escape)
+          value = value.join(" ") if value.is_a?(Array)
+          value = ERB::Util.h(value) if escape
+          %(#{key}="#{value}")
+        end
+    end
+  end
+end
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