* ext/psych/lib: moved external library dependent files from lib.

  [ruby-core:29129]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@27112 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 81 insertions, 0 deletions

diff --git a/ext/psych/lib/psych/nodes/sequence.rb b/ext/psych/lib/psych/nodes/sequence.rb
new file mode 100644
index 0000000000..e4b833d330
--- /dev/null
+++ b/ext/psych/lib/psych/nodes/sequence.rb
@@ -0,0 +1,81 @@
+module Psych
+  module Nodes
+    ###
+    # This class represents a
+    # {YAML sequence}[http://yaml.org/spec/1.1/#sequence/syntax].
+    #
+    # A YAML sequence is basically a list, and looks like this:
+    #
+    #   %YAML 1.1
+    #   ---
+    #   - I am
+    #   - a Sequence
+    #
+    # A YAML sequence may have an anchor like this:
+    #
+    #   %YAML 1.1
+    #   ---
+    #   &A [
+    #     "This sequence",
+    #     "has an anchor"
+    #   ]
+    #
+    # A YAML sequence may also have a tag like this:
+    #
+    #   %YAML 1.1
+    #   ---
+    #   !!seq [
+    #     "This sequence",
+    #     "has a tag"
+    #   ]
+    #
+    # This class represents a sequence in a YAML document.  A
+    # Psych::Nodes::Sequence node may have 0 or more children.  Valid children
+    # for this node are:
+    #
+    # * Psych::Nodes::Sequence
+    # * Psych::Nodes::Mapping
+    # * Psych::Nodes::Scalar
+    # * Psych::Nodes::Alias
+    class Sequence < Psych::Nodes::Node
+      # Any Styles, emitter chooses
+      ANY   = 0
+
+      # Block style sequence
+      BLOCK = 1
+
+      # Flow style sequence
+      FLOW  = 2
+
+      # The anchor for this sequence (if any)
+      attr_accessor :anchor
+
+      # The tag name for this sequence (if any)
+      attr_accessor :tag
+
+      # Is this sequence started implicitly?
+      attr_accessor :implicit
+
+      # The sequece style used
+      attr_accessor :style
+
+      ###
+      # Create a new object representing a YAML sequence.
+      #
+      # +anchor+ is the anchor associated with the sequence or nil.
+      # +tag+ is the tag associated with the sequence or nil.
+      # +implicit+ a boolean indicating whether or not the sequence was
+      # implicitly started.
+      # +style+ is an integer indicating the list style.
+      #
+      # See Psych::Handler#start_sequence
+      def initialize anchor = nil, tag = nil, implicit = true, style = BLOCK
+        super()
+        @anchor   = anchor
+        @tag      = tag
+        @implicit = implicit
+        @style    = style
+      end
+    end
+  end
+end