Kiwi is a C implementation of the vast majority of MediaWiki's wikitext syntax. It currently takes input on stdin and presents output on stdout, and there is a Ruby FFI module for direct library use as well. The major advantages of this implementation are intended to be speed and memory footprint.
At the moment a 100 line wikitext file with fairly complex markup can be parsed in 5-6ms on a one year old Apple MacBook Pro.
Kiwi is running on the web at drasticcode.com. Check it out there for a better list of capabilities.
require "yapwtp"
parser = WikiParser.new
# Open the requested file, parse, capture text and templates
wikitext = parser.html_from_file("cnn.com.wt")
templates = parser.templates
templates.each do |template|
template_file = File.join("templates", template[:name])
if File.exist? template_file
wikitext.gsub! /#{template[:replace_tag]}/, parser.html_from_file(template_file)
end
end
puts wikitext