76 lines
1.9 KiB
Ruby
76 lines
1.9 KiB
Ruby
# Allow the metal piece to run in isolation
|
|
require(File.dirname(__FILE__) + "/../../config/environment") unless defined?(Rails)
|
|
|
|
require 'instiki_stringsupport'
|
|
|
|
class Itex
|
|
def self.call(env)
|
|
if env["PATH_INFO"] =~ /^\/itex/
|
|
[200, {"Content-Type" => "application/xml"}, [response(env)]]
|
|
else
|
|
[404, {"Content-Type" => "text/html"}, ["Not Found"]]
|
|
end
|
|
end
|
|
|
|
private
|
|
|
|
# plugable XML parser; falls back to REXML
|
|
begin
|
|
require 'nokogiri'
|
|
def self.xmlparse(text)
|
|
Nokogiri::XML(text) { |config| config.options = Nokogiri::XML::ParseOptions::STRICT }
|
|
end
|
|
rescue LoadError
|
|
require 'rexml/document'
|
|
def self.xmlparse(text)
|
|
REXML::Document.new(text)
|
|
end
|
|
end
|
|
|
|
#error message to return
|
|
def self.error(str)
|
|
"<math xmlns='http://www.w3.org/1998/Math/MathML' display='inline'><merror><mtext>" +
|
|
str + "</mtext></merror></math>"
|
|
end
|
|
|
|
# itex2MML parser
|
|
begin
|
|
require 'itextomml'
|
|
def self.parse_itex(tex, filter)
|
|
Itex2MML::Parser.new.send(filter, tex).to_utf8
|
|
end
|
|
rescue LoadError
|
|
def self.parse_itex(tex, filter)
|
|
error("Please install the itex2MML Ruby bindings.")
|
|
end
|
|
end
|
|
|
|
# the actual response
|
|
def self.response(env)
|
|
params = Rack::Request.new(env).params
|
|
tex = (params['tex'] || '').purify.strip
|
|
case params['display']
|
|
when 'block'
|
|
filter = :block_filter
|
|
else
|
|
filter = :inline_filter
|
|
end
|
|
return "<math xmlns='http://www.w3.org/1998/Math/MathML' display='" +
|
|
filter.to_s[/(.*?)_filter/] + "'/>" if tex == ''
|
|
begin
|
|
doc = parse_itex(tex, filter)
|
|
# make sure the result is well-formed, before sending it off
|
|
begin
|
|
xmlparse(doc)
|
|
rescue
|
|
return error("Ill-formed XML.")
|
|
end
|
|
return doc
|
|
rescue Itex2MML::Error => e
|
|
error(e.to_s)
|
|
rescue
|
|
error("Unknown Error")
|
|
end
|
|
end
|
|
end
|