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