Support full filename to make a link for a text file

lib/rdoc/cross_reference.rb

@@ -173,7 +173,7 @@ def resolve name, text
           end unless ref
 
     # Try a page name
-    ref = @store.page name if not ref and name =~ /^\w+$/
+    ref = @store.page name if not ref and name =~ /^[\w.]+$/
 
     ref = nil if RDoc::Alias === ref # external alias, can't link to it
 

lib/rdoc/store.rb

@@ -723,7 +723,7 @@ def modules_hash
 
   def page name
     @text_files_hash.each_value.find do |file|
-      file.page_name == name
+      file.page_name == name or file.base_name == name
     end
   end
 

test/rdoc/test_rdoc_store.rb

@@ -611,6 +611,14 @@ def test_page
     assert_equal page, @store.page('PAGE')
   end
 
+  def test_page_with_extension
+    page = @store.add_file 'PAGE.txt', parser: RDoc::Parser::Simple
+
+    assert_nil @store.page 'no such page'
+
+    assert_equal page, @store.page('PAGE.txt')
+  end
+
   def test_save
     FileUtils.mkdir_p @tmpdir