Broken warnings implementation.

lib/liquid/block.rb

@@ -56,6 +56,21 @@ module Liquid
       assert_missing_delimitation!
     end
 
+    # warnings of this block and all sub-tags
+    def warnings
+      all_warnings = []
+      all_warnings.concat(@warnings) if @warnings
+
+      return all_warnings unless @nodelist
+      @nodelist.each do |node|
+        p node
+        node_warns = node.respond_to?(:warnings) ? node.warnings : nil
+        all_warnings.concat(node_warns) if node_warns
+      end
+
+      all_warnings
+    end
+
     def end_tag
     end
 

lib/liquid/tag.rb

@@ -33,6 +33,10 @@ module Liquid
       @blank || true
     end
 
+    def warnings
+      @warnings
+    end
+
     def parse_with_selected_parser(markup)
       case @options[:error_mode] || Template.error_mode
       when :strict then strict_parse_with_error_context(markup)

lib/liquid/template.rb

@@ -69,9 +69,17 @@ module Liquid
     # Returns self for easy chaining
     def parse(source, options = {})
       @root = Document.new(tokenize(source), options)
+      @warnings = nil
       self
     end
 
+    # memoize because the warnings operation
+    # could be expensive.
+    def warnings
+      return [] unless @root
+      @warnings ||= @root.warnings
+    end
+
     def registers
       @registers ||= {}
     end