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require 'nokogiri'
class Nokogiri::HTML::Document
# Returns an array of lower-cased <meta name="ROBOTS"> tokens. If
# no tag is found, returns an empty array. An optional
# +custom_name+ specifies the name of a meta tag to look for ahead
# of "ROBOTS". Names are compared in a case-insensitive manner.
def meta_robots(custom_name = nil)
(@meta_robots ||= {})[custom_name] =
(custom_name && parse_meta_robots(custom_name)) || parse_meta_robots('robots')
end
# Equivalent to meta_robots(custom_name).include?('noindex').
def noindex?(custom_name = nil)
meta_robots(custom_name).include?('noindex')
end
# Equivalent to meta_robots(custom_name).include?('nofollow').
def nofollow?(custom_name = nil)
meta_robots(custom_name).include?('nofollow')
end
private
def parse_meta_robots(custom_name)
pattern = /\A#{Regexp.quote(custom_name)}\z/i
meta = css('meta[@name]').find { |element|
element['name'].match(pattern)
} and content = meta['content'] or return []
content.downcase.split(/[,\s]+/)
end
end
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