Wrapper class. Use this class to access the XPath
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.
Iterates over nodes that match the given path, calling the supplied block with the match.
The context element
The xpath to search for. If not supplied or nil, defaults to '*'
If supplied, a Hash which defines a namespace mapping
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 60 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
Finds and returns the first node that matches the supplied xpath.
The context element
The xpath to search for. If not supplied or nil, returns the first node matching '*'.
If supplied, a Hash which defines a namespace mapping.
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 31 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
Returns an array of nodes matching a given XPath
.
# File rexml/xpath.rb, line 72 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