* ext/psych/lib/psych/emitter.rb: removing unused file.

* ext/psych/lib/psych/json/tree_builder.rb: moving tree builder to an
  event based external class.
* ext/psych/lib/psych/tree_builder.rb: adding an end_stream event.
* ext/psych/lib/psych/visitors/json_tree.rb: using event based AST
  builder.
* ext/psych/lib/psych/visitors/yaml_tree.rb: using event based AST
  builder.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@27855 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 13 insertions, 8 deletions

diff --git a/ext/psych/lib/psych/tree_builder.rb b/ext/psych/lib/psych/tree_builder.rb
index 2b16290b8f..54d87a0b61 100644
--- a/ext/psych/lib/psych/tree_builder.rb
+++ b/ext/psych/lib/psych/tree_builder.rb
@@ -14,15 +14,14 @@ module Psych
   # See Psych::Handler for documentation on the event methods used in this
   # class.
   class TreeBuilder < Psych::Handler
+    # Returns the root node for the built tree
+    attr_reader :root
+
     # Create a new TreeBuilder instance
     def initialize
       @stack = []
       @last  = nil
-    end
-
-    # Returns the root node for the built tree
-    def root
-      @stack.first
+      @root  = nil
     end
 
     %w{
@@ -48,7 +47,7 @@ module Psych
     #
     # See Psych::Handler#start_document
     def start_document version, tag_directives, implicit
-      n = Nodes::Document.new(version, tag_directives, implicit)
+      n = Nodes::Document.new version, tag_directives, implicit
       @last.children << n
       push n
     end
@@ -64,7 +63,12 @@ module Psych
     end
 
     def start_stream encoding
-      push Nodes::Stream.new(encoding)
+      @root = Nodes::Stream.new(encoding)
+      push @root
+    end
+
+    def end_stream
+      pop
     end
 
     def scalar value, anchor, tag, plain, quoted, style
@@ -82,8 +86,9 @@ module Psych
     end
 
     def pop
-      @stack.pop
+      x = @stack.pop
       @last = @stack.last
+      x
     end
   end
 end