1 files changed, 80 insertions, 0 deletions
diff --git a/ruby_2_2/lib/rexml/xpath.rb b/ruby_2_2/lib/rexml/xpath.rb
new file mode 100644
index 0000000000..0f99808def
--- /dev/null
+++ b/ruby_2_2/lib/rexml/xpath.rb
@@ -0,0 +1,80 @@
+require 'rexml/functions'
+require 'rexml/xpath_parser'
+
+module REXML
+  # Wrapper class.  Use this class to access the XPath functions.
+  class XPath
+    include Functions
+    # A base Hash object, supposing to be used when initializing a
+    # default empty namespaces set, but is currently unused.
+    # TODO: either set the namespaces=EMPTY_HASH, or deprecate this.
+    EMPTY_HASH = {}
+
+    # Finds and returns the first node that matches the supplied xpath.
+    # element::
+    #   The context element
+    # path::
+    #   The xpath to search for.  If not supplied or nil, returns the first
+    #   node matching '*'.
+    # namespaces::
+    #   If supplied, a Hash which defines a namespace mapping.
+    # variables::
+    #   If supplied, a Hash which maps $variables in the query
+    #   to values. This can be used to avoid XPath injection attacks
+    #   or to automatically handle escaping string values.
+    #
+    #  XPath.first( node )
+    #  XPath.first( doc, "//b"} )
+    #  XPath.first( node, "a/x:b", { "x"=>"http://doofus" } )
+    #  XPath.first( node, '/book/publisher/text()=$publisher', {}, {"publisher"=>"O'Reilly"})
+    def XPath::first element, path=nil, namespaces=nil, variables={}
+      raise "The namespaces argument, if supplied, must be a hash object." unless namespaces.nil? or namespaces.kind_of?(Hash)
+      raise "The variables argument, if supplied, must be a hash object." unless variables.kind_of?(Hash)
+      parser = XPathParser.new
+      parser.namespaces = namespaces
+      parser.variables = variables
+      path = "*" unless path
+      element = [element] unless element.kind_of? Array
+      parser.parse(path, element).flatten[0]
+    end
+
+    # Iterates over nodes that match the given path, calling the supplied
+    # block with the match.
+    # element::
+    #   The context element
+    # path::
+    #   The xpath to search for.  If not supplied or nil, defaults to '*'
+    # namespaces::
+    #   If supplied, a Hash which defines a namespace mapping
+    # variables::
+    #   If supplied, a Hash which maps $variables in the query
+    #   to values. This can be used to avoid XPath injection attacks
+    #   or to automatically handle escaping string values.
+    #
+    #  XPath.each( node ) { |el| ... }
+    #  XPath.each( node, '/*[@attr='v']' ) { |el| ... }
+    #  XPath.each( node, 'ancestor::x' ) { |el| ... }
+    #  XPath.each( node, '/book/publisher/text()=$publisher', {}, {"publisher"=>"O'Reilly"}) \
+    #    {|el| ... }
+    def XPath::each element, path=nil, namespaces=nil, variables={}, &block
+      raise "The namespaces argument, if supplied, must be a hash object." unless namespaces.nil? or namespaces.kind_of?(Hash)
+      raise "The variables argument, if supplied, must be a hash object." unless variables.kind_of?(Hash)
+      parser = XPathParser.new
+      parser.namespaces = namespaces
+      parser.variables = variables
+      path = "*" unless path
+      element = [element] unless element.kind_of? Array
+      parser.parse(path, element).each( &block )
+    end
+
+    # Returns an array of nodes matching a given XPath.
+    def XPath::match element, path=nil, namespaces=nil, variables={}
+      parser = XPathParser.new
+      parser.namespaces = namespaces
+      parser.variables = variables
+      path = "*" unless path
+      element = [element] unless element.kind_of? Array
+      parser.parse(path,element)
+    end
+  end
+end