* lib/yaml: Moved to ext/syck/lib, Syck only uses Syck constant.

* lib/yaml.rb: Added an engine manager for choosing YAML engine.
* ext/syck/lib/syck/rubytypes.rb: squashed warnings when using Psych

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@27212 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 85 insertions, 0 deletions

diff --git a/ext/syck/lib/syck/stringio.rb b/ext/syck/lib/syck/stringio.rb
new file mode 100644
index 0000000000..77a2b827e5
--- /dev/null
+++ b/ext/syck/lib/syck/stringio.rb
@@ -0,0 +1,85 @@
+warn "#{caller[0]}: yaml/stringio is deprecated" if $VERBOSE
+
+#
+# Limited StringIO if no core lib is available
+#
+begin
+require 'stringio'
+rescue LoadError
+    # StringIO based on code by MoonWolf
+    class StringIO
+        def initialize(string="")
+            @string=string
+            @pos=0
+            @eof=(string.size==0)
+        end
+        def pos
+            @pos
+        end
+        def eof
+            @eof
+        end
+        alias eof? eof
+        def readline(rs=$/)
+            if @eof
+                raise EOFError
+            else
+                if p = @string[@pos..-1]=~rs
+                    line = @string[@pos,p+1]
+                else
+                    line = @string[@pos..-1]
+                end
+                @pos+=line.size
+                @eof =true if @pos==@string.size
+                $_ = line
+            end
+        end
+        def rewind
+            seek(0,0)
+        end
+        def seek(offset,whence)
+            case whence
+            when 0
+                @pos=offset
+            when 1
+                @pos+=offset
+            when 2
+                @pos=@string.size+offset
+            end
+            @eof=(@pos>=@string.size)
+            0
+        end
+    end
+
+	#
+	# Class method for creating streams
+	#
+	def Syck.make_stream( io )
+        if String === io
+            io = StringIO.new( io )
+        elsif not IO === io
+            raise Syck::Error, "YAML stream must be an IO or String object."
+        end
+        if Syck::unicode
+            def io.readline
+                Syck.utf_to_internal( readline( @ln_sep ), @utf_encoding )
+            end
+            def io.check_unicode
+                @utf_encoding = Syck.sniff_encoding( read( 4 ) )
+                @ln_sep = Syck.enc_separator( @utf_encoding )
+                seek( -4, IO::SEEK_CUR )
+            end
+		    def io.utf_encoding
+		    	@utf_encoding
+		    end
+            io.check_unicode
+        else
+            def io.utf_encoding
+                :None
+            end
+        end
+        io
+	end
+
+end
+