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# By Henrik Nyh <http://henrik.nyh.se> 2008-01-30. # Free to modify and redistribute with credit. require "rubygems" require "hpricot" module TextHelper # Like the Rails _truncate_ helper but doesn't break HTML tags or entities. def truncate_html(text, max_length = 30, ellipsis = "...") return if text.nil? doc = Hpricot(text.to_s) ellipsis_length = Hpricot(ellipsis).inner_text.chars.length content_length = doc.inner_text.chars.length actual_length = max_length - ellipsis_length content_length > max_length ? doc.truncate(actual_length).inner_html + ellipsis : text.to_s end end module HpricotTruncator module NodeWithChildren def truncate(max_length) return self if inner_text.chars.length <= max_length truncated_node = self.dup truncated_node.children = [] each_child do |node| remaining_length = max_length - truncated_node.inner_text.chars.length break if remaining_length == 0 truncated_node.children << node.truncate(remaining_length) end truncated_node end end module TextNode def truncate(max_length) # We're using String#scan because Hpricot doesn't distinguish entities. Hpricot::Text.new(content.scan(/&#?[^\W_]+;|./).first(max_length).join) end end module IgnoredTag def truncate(max_length) self end end end Hpricot::Doc.send(:include, HpricotTruncator::NodeWithChildren) Hpricot::Elem.send(:include, HpricotTruncator::NodeWithChildren) Hpricot::Text.send(:include, HpricotTruncator::TextNode) Hpricot::BogusETag.send(:include, HpricotTruncator::IgnoredTag) Hpricot::Comment.send(:include, HpricotTruncator::IgnoredTag)

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