module Nokogiri::CSS

Translate a CSS selector to the equivalent XPath query.

Parameters

• selector (String) The CSS selector to be translated into XPath

• prefix: (String)

  The XPath prefix for the query, see Nokogiri::XML::XPath for some options. Default is XML::XPath::GLOBAL_SEARCH_PREFIX.

• visitor: (Nokogiri::CSS::XPathVisitor)

  The visitor class to use to transform the AST into XPath. Default is Nokogiri::CSS::XPathVisitor.new.

• ns: (Hash<String ⇒ String>)

  The namespaces that are referenced in the query, if any. This is a hash where the keys are the namespace prefix and the values are the namespace URIs. Default is an empty Hash.

Returns

(String) The equivalent XPath query for selector

💡 Note that translated queries are cached for performance concerns.

# File lib/nokogiri/css.rb, line 42
def xpath_for(selector, options = {})
  raise TypeError, "no implicit conversion of #{selector.inspect} to String" unless selector.respond_to?(:to_str)

  selector = selector.to_str
  raise Nokogiri::CSS::SyntaxError, "empty CSS selector" if selector.empty?

  prefix = options.fetch(:prefix, Nokogiri::XML::XPath::GLOBAL_SEARCH_PREFIX)
  visitor = options.fetch(:visitor) { Nokogiri::CSS::XPathVisitor.new }
  ns = options.fetch(:ns, {})

  Parser.new(ns).xpath_for(selector, prefix, visitor)
end