Remove parser switching duplication

lib/liquid/variable.rb

@@ -15,30 +15,24 @@ module Liquid
     EasyParse = /\A *(\w+(?:\.\w+)*) *\z/
     attr_accessor :filters, :name, :warnings
     attr_accessor :line_number
+    include ParserSwitching
 
     def initialize(markup, options = {})
       @markup  = markup
       @name    = nil
       @options = options || {}
 
-      case @options[:error_mode] || Template.error_mode
-      when :strict then strict_parse(markup)
-      when :lax    then lax_parse(markup)
-      when :warn
-        begin
-          strict_parse(markup)
-        rescue SyntaxError => e
-          @warnings ||= []
-          @warnings << e
-          lax_parse(markup)
-        end
-      end
+      parse_with_selected_parser(markup)
     end
 
     def raw
       @markup
     end
 
+    def markup_context(markup)
+      " in \"{{#{markup}}}\""
+    end
+
     def lax_parse(markup)
       @filters = []
       if markup =~ /\s*(#{QuotedFragment})(.*)/om
@@ -74,9 +68,6 @@ module Liquid
         @filters << [filtername, filterargs]
       end
       p.consume(:end_of_string)
-    rescue SyntaxError => e
-      e.message << " in \"{{#{markup}}}\""
-      raise e
     end
 
     def parse_filterargs(p)