Fix version checks so they are same as before

Author: makmic

lib/angular_xss/haml.rb

@@ -1,4 +1,6 @@
-if Gem::Version.new(Haml::VERSION) < Gem::Version.new(5)
+haml_version = Gem::Version.new(Haml::VERSION)
+
+if haml_version < Gem::Version.new(5)
   # Use module_eval so we crash when Haml::Helpers has not yet been loaded.
   Haml::Helpers.module_eval do
     def html_escape_with_escaping_angular_expressions(s)
@@ -8,8 +10,10 @@ def html_escape_with_escaping_angular_expressions(s)
     alias_method :html_escape_without_escaping_angular_expressions, :html_escape
     alias_method :html_escape, :html_escape_with_escaping_angular_expressions
   end
-elsif Gem::Version.new(Haml::VERSION) < Gem::Version.new(6)
+elsif haml_version < Gem::Version.new('5.2')
   # Haml 5.0 and 5.1 fall back to erb
+elsif haml_version < Gem::Version.new(6)
+  # HAML 5.2+
   Haml::Helpers.module_eval do
     def html_escape_without_haml_xss_with_escaping_angular_expressions(s)
       html_escape_without_haml_xss_without_escaping_angular_expressions(AngularXss::Escaper.escape_if_unsafe(s))
@@ -19,7 +23,8 @@ def html_escape_without_haml_xss_with_escaping_angular_expressions(s)
     alias_method :html_escape_without_haml_xss, :html_escape_without_haml_xss_with_escaping_angular_expressions
   end
 else
-  # Haml 6+ ditched most of is helpers. in favor of Haml::Util.escape_html
+  # Haml 6+
+  # It ditched most of is own helpers in favor of Haml::Util.escape_html
   # https://github.com/haml/haml/blob/main/CHANGELOG.md#600
   # https://github.com/haml/haml/compare/v5.2.2...v6.3.0
   # https://github.com/haml/haml/blob/v6.3.0/lib/haml/util.rb