escape_xpath_string

escape_xpath_string.rb

def escape_xpath_string(string)
  return "'#{string}'" if !string.include?("'")
  components = string.split("'", -1).map { |component| "'#{component}'" }
  "concat(#{components.join(%Q{,"'",})})"
end

title = "Let's Eat!"
# This is bad!
".//table//tr[td[. = '#{title}']]" == ".//table//tr[td[. = 'Let's Eat!']]"
# This is good!
".//table//tr[td[. = #{escape_xpath_string(title)}]]" == %Q{.//table//tr[td[. = concat('Let',"'",'s Eat!')]]}

# Examples that cover all cases:

escape_xpath_string("'Allo 'Allo is the dogs'")
#=> concat('',"'",'Allo ',"'",'Allo is the dogs',"'",'')

escape_xpath_string("'evenin")
#=> concat('',"'",'evenin')

escape_xpath_string("hello good lookin'")
#=> concat('hello good lookin',"'",'')

escape_xpath_string("this is boring")
#=> 'this is boring'