You don't want to use this class. Really. Use XPath, which is a wrapper for this class. Believe me. You don't want to poke around in here. There is strange, dark magic at work in this code. Beware. Go back! Go back while you still can!
# File rexml/xpath_parser.rb, line 82 def []=( variable_name, value ) @variables[ variable_name ] = value end
Performs a depth-first (document order) XPath search, and returns the first match. This is the fastest, lightest way to return a single result.
FIXME: This method is incomplete!
# File rexml/xpath_parser.rb, line 91 def first( path_stack, node ) return nil if path.size == 0 case path[0] when :document # do nothing return first( path[1..-1], node ) when :child for c in node.children r = first( path[1..-1], c ) return r if r end when :qname name = path[2] if node.name == name return node if path.size == 3 return first( path[3..-1], node ) else return nil end when :descendant_or_self r = first( path[1..-1], node ) return r if r for c in node.children r = first( path, c ) return r if r end when :node return first( path[1..-1], node ) when :any return first( path[1..-1], node ) end return nil end
# File rexml/xpath_parser.rb, line 72 def get_first path, nodeset path_stack = @parser.parse( path ) first( path_stack, nodeset ) end
# File rexml/xpath_parser.rb, line 127 def match(path_stack, nodeset) nodeset = nodeset.collect.with_index do |node, i| position = i + 1 XPathNode.new(node, position: position) end result = expr(path_stack, nodeset) case result when Array # nodeset unnode(result) else result end end
# File rexml/xpath_parser.rb, line 57 def namespaces=( namespaces={} ) Functions::namespace_context = namespaces @namespaces = namespaces end
# File rexml/xpath_parser.rb, line 67 def parse path, nodeset path_stack = @parser.parse( path ) match( path_stack, nodeset ) end