* ext/psych/lib/psych/deprecated.rb: implementing Psych.quick_emit and

  adding deprecation warnings.
* ext/psych/lib/psych/visitors/to_ruby.rb: supporting deprecated
  yaml_initialize api.
* ext/psych/lib/psych/visitors/yaml_tree.rb: supporting deprecated
  to_yaml api.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@27280 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

3 files changed, 22 insertions, 2 deletions

diff --git a/ext/psych/lib/psych.rb b/ext/psych/lib/psych.rb
index 9b4b215b67..42cd8877be 100644
--- a/ext/psych/lib/psych.rb
+++ b/ext/psych/lib/psych.rb
@@ -8,6 +8,7 @@ require 'psych/omap'
 require 'psych/set'
 require 'psych/coder'
 require 'psych/core_ext'
+require 'psych/deprecated'
 
 ###
 # = Overview
diff --git a/ext/psych/lib/psych/visitors/to_ruby.rb b/ext/psych/lib/psych/visitors/to_ruby.rb
index 2790cdeb3d..56c970002c 100644
--- a/ext/psych/lib/psych/visitors/to_ruby.rb
+++ b/ext/psych/lib/psych/visitors/to_ruby.rb
@@ -219,10 +219,16 @@ module Psych
       end
 
       def init_with o, h, node
+        c = Psych::Coder.new(node.tag)
+        c.map = h
+
         if o.respond_to?(:init_with)
-          c = Psych::Coder.new(node.tag)
-          c.map = h
           o.init_with c
+        elsif o.respond_to?(:yaml_initialize)
+          if $VERBOSE
+            "Implementing #{o.class}#yaml_initialize is deprecated, please implement \"init_with(coder)\""
+          end
+          o.yaml_initialize c.tag, c.map
         else
           h.each { |k,v| o.instance_variable_set(:"@#{k}", v) }
         end
diff --git a/ext/psych/lib/psych/visitors/yaml_tree.rb b/ext/psych/lib/psych/visitors/yaml_tree.rb
index e1e89a0d41..3cbb695bce 100644
--- a/ext/psych/lib/psych/visitors/yaml_tree.rb
+++ b/ext/psych/lib/psych/visitors/yaml_tree.rb
@@ -36,6 +36,19 @@ module Psych
           return append Nodes::Alias.new target.object_id.to_s
         end
 
+        if target.respond_to?(:to_yaml)
+          loc = target.method(:to_yaml).source_location.first
+          if loc !~ /(syck\/rubytypes.rb|psych\/core_ext.rb)/
+            unless target.respond_to?(:encode_with)
+              if $VERBOSE
+                warn "implementing to_yaml is deprecated, please implement \"encode_with\""
+              end
+
+              target.to_yaml(:nodump => true)
+            end
+          end
+        end
+
         if target.respond_to?(:encode_with)
           dump_coder target
         else