Initial github import of liquid

lib/liquid/variable.rb

@@ -0,0 +1,52 @@
+module Liquid
+  
+  # Holds variables. Variables are only loaded "just in time"
+  # and are not evaluated as part of the render stage
+  #
+  #   {{ monkey }}
+  #   {{ user.name }}
+  #
+  # Variables can be combined with filters:
+  #
+  #   {{ user | link }}
+  #
+  class Variable    
+    attr_accessor :filters, :name
+    
+    def initialize(markup)
+      @markup  = markup                            
+      @name    = nil
+      @filters = []
+      if match = markup.match(/\s*(#{QuotedFragment})/)
+        @name = match[1]
+        if markup.match(/#{FilterSperator}\s*(.*)/)
+          filters = Regexp.last_match(1).split(/#{FilterSperator}/)
+        
+          filters.each do |f|    
+            if matches = f.match(/\s*(\w+)/)
+              filtername = matches[1]
+              filterargs = f.scan(/(?:#{FilterArgumentSeparator}|#{ArgumentSeparator})\s*(#{QuotedFragment})/).flatten            
+              @filters << [filtername.to_sym, filterargs]
+            end
+          end
+        end
+      end
+    end                        
+
+    def render(context)      
+      return '' if @name.nil?
+      output = context[@name]
+      @filters.inject(output) do |output, filter|
+        filterargs = filter[1].to_a.collect do |a|
+         context[a]
+        end
+        begin
+          output = context.invoke(filter[0], output, *filterargs)
+        rescue FilterNotFound
+          raise FilterNotFound, "Error - filter '#{filter[0]}' in '#{@markup.strip}' could not be found."
+        end
+      end  
+      output
+    end
+  end
+end