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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

Filemanager

DIR : / usr/ share/ ruby/ rexml/
Name Type Size Permission Actions
dtd Folder 0755
formatters Folder 0755
light Folder 0755
parsers Folder 0755
validation Folder 0755
attlistdecl.rb File 1.89 KB 0644
attribute.rb File 5.39 KB 0644
cdata.rb File 1.54 KB 0644
child.rb File 2.63 KB 0644
comment.rb File 2.14 KB 0644
doctype.rb File 6.58 KB 0644
document.rb File 9.52 KB 0644
element.rb File 43.85 KB 0644
encoding.rb File 1.13 KB 0644
entity.rb File 5.53 KB 0644
functions.rb File 11.27 KB 0644
instruction.rb File 2.01 KB 0644
namespace.rb File 1.09 KB 0644
node.rb File 2.13 KB 0644
output.rb File 519 B 0644
parent.rb File 4.33 KB 0644
parseexception.rb File 1.22 KB 0644
quickpath.rb File 9.08 KB 0644
rexml.rb File 1.65 KB 0644
sax2listener.rb File 3.6 KB 0644
source.rb File 7.6 KB 0644
streamlistener.rb File 3.88 KB 0644
syncenumerator.rb File 685 B 0644
text.rb File 13.57 KB 0644
undefinednamespaceexception.rb File 210 B 0644
xmldecl.rb File 2.68 KB 0644
xmltokens.rb File 526 B 0644
xpath.rb File 3.31 KB 0644
xpath_parser.rb File 25.7 KB 0644