Allow single quotes inside "has_content" text

As it is not possible to escape quotes in an XPath string, we must
instead selectively use single or double quotes, and possibly split
input up into groups.

Signed-off-by: Wincent Colaiuta <win@wincent.com>

lib/capybara/session.rb

@@ -82,7 +82,7 @@ module Capybara
     end
 
     def has_content?(content)
-      has_xpath?("//*[contains(.,'#{content}')]")
+      has_xpath?("//*[contains(.,#{sanitized_xpath_string(content)})]")
     end
 
     def has_xpath?(path, options={})
@@ -196,5 +196,16 @@ module Capybara
       locator = current_scope.to_s + locator
       driver.find(locator)
     end
+
+    def sanitized_xpath_string(string)
+      if string =~ /'/
+        string = string.split("'", -1).map do |substr|
+          "'#{substr}'"
+        end.join(%q{,"'",})
+        "concat(#{string})"
+      else
+        "'#{string}'"
+      end
+    end
   end
 end

spec/session_spec.rb

@@ -304,6 +304,21 @@ shared_examples_for "session" do
       @session.should_not have_content('xxxxyzzz')
       @session.should_not have_content('monkey')
     end
+
+    it 'should handle single quotes in the content' do
+      @session.visit('/with-quotes')
+      @session.should have_content("can't")
+    end
+
+    it 'should handle double quotes in the content' do
+      @session.visit('/with-quotes')
+      @session.should have_content(%q{"No," he said})
+    end
+
+    it 'should handle mixed single and double quotes in the content' do
+      @session.visit('/with-quotes')
+      @session.should have_content(%q{"you can't do that."})
+    end
   end
 
   describe '#has_xpath?' do

spec/test_app.rb

@@ -24,7 +24,11 @@ class TestApp < Sinatra::Base
   get '/landed' do
     "You landed"
   end
-  
+
+  get '/with-quotes' do
+    %q{"No," he said, "you can't do that."}
+  end
+
   get '/form/get' do
     '<pre id="results">' + params[:form].to_yaml + '</pre>'
   end