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Diffstat (limited to 'lib/banzai/querying.rb')
| -rw-r--r-- | lib/banzai/querying.rb | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/lib/banzai/querying.rb b/lib/banzai/querying.rb new file mode 100644 index 00000000000..1e1b51e683e --- /dev/null +++ b/lib/banzai/querying.rb @@ -0,0 +1,18 @@ +module Banzai + module Querying + # Searches a Nokogiri document using a CSS query, optionally optimizing it + # whenever possible. + # + # document - A document/element to search. + # query - The CSS query to use. + # + # Returns a Nokogiri::XML::NodeSet. + def self.css(document, query) + # When using "a.foo" Nokogiri compiles this to "//a[...]" but + # "descendant::a[...]" is quite a bit faster and achieves the same result. + xpath = Nokogiri::CSS.xpath_for(query)[0].gsub(%r{^//}, 'descendant::') + + document.xpath(xpath) + end + end +end |