method

first

v1_8_7_330 - Show latest stable - 0 notes - Class: REXML::XPath

first(element, path=nil, namespaces=nil, variables={}) public

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.

XPath.first( node )
XPath.first( doc, "//b"} )
XPath.first( node, "a/x:b", { "x"=>"http://doofus" } )

Show source

# File lib/rexml/xpath.rb, line 22
    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

first

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