Created
July 30, 2011 12:28
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helper that truncates html and removes coderay syntax
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require "rubygems" | |
require "nokogiri" | |
module TextHelper | |
def truncate_html(text, max_length = 10, ellipsis = "...") | |
doc = Nokogiri::HTML::DocumentFragment.parse text | |
# remove syntax highlighting | |
doc.css("div.CodeRay").each do |node| | |
node.remove | |
end | |
content_length = doc.inner_text.length | |
if content_length > max_length | |
doc = doc.truncate(max_length) | |
more = Nokogiri::HTML::DocumentFragment.parse ellipsis | |
doc.children.last.add_child(more.children) | |
doc.to_html.html_safe | |
else | |
text.to_s | |
end | |
end | |
end | |
module NokogiriTruncator | |
module NodeWithChildren | |
def truncate(max_length) | |
return self if inner_text.length <= max_length | |
truncated_node = self.dup | |
truncated_node.children.remove | |
self.children.each do |node| | |
remaining_length = max_length - truncated_node.inner_text.length | |
break if remaining_length <= 0 | |
truncated_node.add_child node.truncate(remaining_length) | |
end | |
truncated_node | |
end | |
end | |
module TextNode | |
def truncate(max_length) | |
Nokogiri::XML::Text.new(content[0..(max_length - 1)], parent) | |
end | |
end | |
end | |
Nokogiri::HTML::DocumentFragment.send(:include, NokogiriTruncator::NodeWithChildren) | |
Nokogiri::XML::Element.send(:include, NokogiriTruncator::NodeWithChildren) | |
Nokogiri::XML::Text.send(:include, NokogiriTruncator::TextNode) |
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