Args -> ArgumentsNode

- Fixes ruby-syntax-tree#351
- Changed all use of `parts` to `arguments` as well.

lib/syntax_tree/dsl.rb

@@ -55,9 +55,9 @@ def ArgParen(arguments)
       ArgParen.new(arguments: arguments, location: Location.default)
     end
 
-    # Create a new Args node.
-    def Args(parts)
-      Args.new(parts: parts, location: Location.default)
+    # Create a new ArgumentsNode node.
+    def ArgumentsNode(arguments)
+      ArgumentsNode.new(arguments: arguments, location: Location.default)
     end
 
     # Create a new ArgBlock node.

lib/syntax_tree/field_visitor.rb

@@ -94,9 +94,9 @@ def visit_arg_star(node)
         end
       end
 
-      def visit_args(node)
-        node(node, "args") do
-          list("parts", node.parts)
+      def visit_arguments_node(node)
+        node(node, "arguments_node") do
+          list("arguments", node.arguments)
           comments(node)
         end
       end

lib/syntax_tree/index.rb

@@ -554,7 +554,7 @@ def visit_command(node)
                   node.location.start_column
                 )
 
-              node.arguments.parts.each do |argument|
+              node.arguments.arguments.each do |argument|
                 next unless argument.is_a?(SymbolLiteral)
                 name = argument.value.value.to_sym
 

lib/syntax_tree/mutation_visitor.rb

@@ -80,9 +80,9 @@ def visit_arg_paren(node)
         node.copy(arguments: visit(node.arguments))
       end
 
-      # Visit a Args node.
-      def visit_args(node)
-        node.copy(parts: visit_all(node.parts))
+      # Visit a ArgumentsNode node.
+      def visit_arguments_node(node)
+        node.copy(arguments: visit_all(node.arguments))
       end
 
       # Visit a ArgBlock node.