Restore loading spinner in richtext previews

[rails.git] / lib / rich_text.rb

diff --git a/lib/rich_text.rb b/lib/rich_text.rb
index 56d358bd8dcb2823afa64a7dcb56e62f5a40d589..bdf9c37ca7359eec1f2cea57c2243178d8ce7791 100644 (file)
--- a/lib/rich_text.rb
+++ b/lib/rich_text.rb
@@ -3,6 +3,8 @@ module RichText
     "Business Description:", "Additional Keywords:"
   ].freeze
 
+  MAX_DESCRIPTION_LENGTH = 500
+
   def self.new(format, text)
     case format
     when "html" then HTML.new(text || "")
@@ -49,6 +51,18 @@ module RichText
         (spammy_phrases * 40)
     end
 
+    def image
+      nil
+    end
+
+    def image_alt
+      nil
+    end
+
+    def description
+      nil
+    end
+
     protected
 
     def simple_format(text)
@@ -80,12 +94,82 @@ module RichText
 
   class Markdown < Base
     def to_html
-      linkify(sanitize(Kramdown::Document.new(self).to_html), :all)
+      linkify(sanitize(document.to_html), :all)
     end
 
     def to_text
       to_s
     end
+
+    def image
+      @image_element = first_image_element(document.root) unless defined? @image_element
+      @image_element.attr["src"] if @image_element
+    end
+
+    def image_alt
+      @image_element = first_image_element(document.root) unless defined? @image_element
+      @image_element.attr["alt"] if @image_element
+    end
+
+    def description
+      return @description if defined? @description
+
+      @description = first_truncated_text_content(document.root)
+    end
+
+    private
+
+    def document
+      @document ||= Kramdown::Document.new(self)
+    end
+
+    def first_image_element(element)
+      return element if image?(element) && element.attr["src"].present?
+
+      element.children.find do |child|
+        nested_image = first_image_element(child)
+        break nested_image if nested_image
+      end
+    end
+
+    def first_truncated_text_content(element)
+      if paragraph?(element)
+        truncated_text_content(element)
+      else
+        element.children.find do |child|
+          text = first_truncated_text_content(child)
+          break text unless text.nil?
+        end
+      end
+    end
+
+    def truncated_text_content(element)
+      text = ""
+
+      append_text = lambda do |child|
+        if child.type == :text
+          text << child.value
+        else
+          child.children.each do |c|
+            append_text.call(c)
+            break if text.length > MAX_DESCRIPTION_LENGTH
+          end
+        end
+      end
+      append_text.call(element)
+
+      return nil if text.blank?
+
+      text.truncate(MAX_DESCRIPTION_LENGTH)
+    end
+
+    def image?(element)
+      element.type == :img || (element.type == :html_element && element.value == "img")
+    end
+
+    def paragraph?(element)
+      element.type == :p || (element.type == :html_element && element.value == "p")
+    end
   end
 
   class Text < Base