simple_format helper doesn't choke on nil. Closes #6644.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@5561 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

actionpack/CHANGELOG

@@ -1,5 +1,7 @@
 *SVN*
 
+* simple_format helper doesn't choke on nil.  #6644 [jerry426]
+
 * Update to Prototype 1.5.0_rc2 [5550] which makes it work in Opera again [Thomas Fuchs]
 
 * Reuse named route helper module between Routing reloads. Use remove_method to delete named route methods after each load. Since the module is never collected, this fixes a significant memory leak. [Nicholas Seckar]

actionpack/lib/action_view/helpers/text_helper.rb

@@ -154,12 +154,10 @@ module ActionView
       # considered as a linebreak and a <tt><br /></tt> tag is appended. This
       # method does not remove the newlines from the +text+. 
       def simple_format(text)
-        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 />') # turn single newline into <br />
-        
-        content_tag("p", text)
+        content_tag 'p', text.to_s.
+          gsub(/\r\n?/, "\n").                    # \r\n and \r -> \n
+          gsub(/\n\n+/, "</p>\n\n<p>").           # 2+ newline  -> paragraph
+          gsub(/([^\n]\n)(?=[^\n])/, '\1<br />')  # 1 newline   -> br
       end
 
       # Turns all urls and email addresses into clickable links. The +link+ parameter 

actionpack/test/template/text_helper_test.rb

@@ -11,17 +11,21 @@ class TextHelperTest < Test::Unit::TestCase
     # a view is rendered.  The cycle helper depends on this behavior.
     @_cycles = nil if (defined? @_cycles)
   end
-  
+
   def test_simple_format
+    assert_equal "<p></p>", simple_format(nil)
+
     assert_equal "<p>crazy\n<br /> cross\n<br /> platform linebreaks</p>", simple_format("crazy\r\n cross\r platform linebreaks")
     assert_equal "<p>A paragraph</p>\n\n<p>and another one!</p>", simple_format("A paragraph\n\nand another one!")
     assert_equal "<p>A paragraph\n<br /> With a newline</p>", simple_format("A paragraph\n With a newline")
-    
-    text = "A\nB\nC\nD"
+
+    text = "A\nB\nC\nD".freeze
     assert_equal "<p>A\n<br />B\n<br />C\n<br />D</p>", simple_format(text)
-    assert_equal text, "A\nB\nC\nD"
+
+    text = "A\r\n  \nB\n\n\r\n\t\nC\nD".freeze
+    assert_equal "<p>A\n<br />  \n<br />B</p>\n\n<p>\t\n<br />C\n<br />D</p>", simple_format(text)
   end
-  
+
   def test_truncate
     assert_equal "Hello World!", truncate("Hello World!", 12)
     assert_equal "Hello Wor...", truncate("Hello World!!", 12)