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  • rexml/xpath.rb

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REXML::XPath

Wrapper class. Use this class to access the XPath functions.

Constants

EMPTY_HASH

Public Class Methods

each(element, path=nil, namespaces=nil, variables={}) click to toggle source

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| ... }
 
               # File rexml/xpath.rb, line 56
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
            
first(element, path=nil, namespaces=nil, variables={}) click to toggle source

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"})
 
               # File rexml/xpath.rb, line 27
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
            
match(element, path=nil, namespaces=nil, variables={}) click to toggle source

Returns an array of nodes matching a given XPath.

 
               # File rexml/xpath.rb, line 68
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