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Contents
module Nokogiri
module Decorators
module Hpricot
module NodeSet
# Select nodes matching the supplied rule.
# Note that positional rules (like <tt>:nth()</tt>) aren't currently supported.
#
# example:
# node_set.filter('.ohmy') # selects nodes from the set with class "ohmy"
# node_set.filter('a#link2') # selects nodes from the set with child node <a id='link2'>
# node_set.filter('a[@id="link2"]') # selects nodes from the set with child node <a id='link2'>
def filter(rule)
filter_transformer( lambda {|j| j}, rule ) # identity transformer
end
# The complement to filter, select nodes <em>not</em> matching the supplied rule.
# Note that positional rules (like <tt>:nth()</tt>) aren't currently supported.
#
# See filter for examples.
#
# Also note that you can pass a XML::Node object instead of a
# rule to remove that object from the node set (if it is
# present):
# node_set.not(node_to_exclude) # selects all nodes EXCEPT node_to_exclude
#
def not(rule)
filter_transformer( lambda {|j| !j}, rule ) # negation transformer
end
private
def filter_transformer(transformer, rule)
sub_set = XML::NodeSet.new(document)
document.decorate(sub_set)
if rule.is_a?(XML::Node)
each { |node| sub_set << node if transformer.call(node == rule) }
return sub_set
end
ctx = CSS::Parser.parse(rule.to_s)
visitor = CSS::XPathVisitor.new
visitor.extend(Hpricot::XPathVisitor)
each do |node|
if transformer.call(node.at(".//self::" + visitor.accept(ctx.first)))
sub_set << node
end
end
sub_set
end
end
end
end
end
Version data entries
9 entries across 9 versions & 1 rubygems