Class | REXML::XPathParser |
In: |
rexml/xpath_parser.rb
|
Parent: | Object |
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 35 def initialize( ) @parser = REXML::Parsers::XPathParser.new @namespaces = {} @variables = {} end
# File rexml/xpath_parser.rb, line 72 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 81 def first( path_stack, node ) #puts "#{depth}) Entering match( #{path.inspect}, #{tree.inspect} )" 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 #puts "#{depth}) CHILD checking #{name(c)}" r = first( path[1..-1], c ) #puts "#{depth}) RETURNING #{r.inspect}" if r return r if r end when :qname name = path[2] #puts "#{depth}) QNAME #{name(tree)} == #{name} (path => #{path.size})" if node.name == name #puts "#{depth}) RETURNING #{tree.inspect}" if path.size == 3 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 59 def get_first path, nodeset #puts "#"*40 path_stack = @parser.parse( path ) #puts "PARSE: #{path} => #{path_stack.inspect}" #puts "PARSE: nodeset = #{nodeset.inspect}" first( path_stack, nodeset ) end
# File rexml/xpath_parser.rb, line 122 def match( path_stack, nodeset ) #puts "MATCH: path_stack = #{path_stack.inspect}" #puts "MATCH: nodeset = #{nodeset.inspect}" r = expr( path_stack, nodeset ) #puts "MAIN EXPR => #{r.inspect}" r end
# File rexml/xpath_parser.rb, line 41 def namespaces=( namespaces={} ) Functions::namespace_context = namespaces @namespaces = namespaces end
# File rexml/xpath_parser.rb, line 51 def parse path, nodeset #puts "#"*40 path_stack = @parser.parse( path ) #puts "PARSE: #{path} => #{path_stack.inspect}" #puts "PARSE: nodeset = #{nodeset.inspect}" match( path_stack, nodeset ) end
# File rexml/xpath_parser.rb, line 67 def predicate path, nodeset path_stack = @parser.parse( path ) expr( path_stack, nodeset ) end