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using System;
using System.IO;
using System.Text.RegularExpressions;
using System.Xml;
using System.Xml.Xsl;
namespace Bind
{
class DocProcessor
{
static readonly Regex remove_mathml = new Regex(@"<(mml:math)[^>]*?>(?:.|\n)*?</\s*\1\s*>",
RegexOptions.Compiled | RegexOptions.Multiline | RegexOptions.IgnorePatternWhitespace);
static readonly XslCompiledTransform xslt = new XslCompiledTransform();
static readonly XmlReaderSettings settings = new XmlReaderSettings();
public DocProcessor(string transform_file)
{
xslt.Load(transform_file);
settings.ProhibitDtd = false;
settings.XmlResolver = null;
}
// Strips MathML tags from the source and replaces the equations with the content
// found in the <!-- eqn: :--> comments in the docs.
// Todo: Some simple MathML tags do not include comments, find a solution.
// Todo: Some files include more than 1 function - find a way to map these extra functions.
public string ProcessFile(string file)
{
string text = File.ReadAllText(file);
Match m = remove_mathml.Match(text);
while (m.Length > 0)
{
string removed = text.Substring(m.Index, m.Length);
text = text.Remove(m.Index, m.Length);
int equation = removed.IndexOf("eqn");
if (equation > 0)
{
text = text.Insert(m.Index,
"<![CDATA[" +
removed.Substring(equation + 4, removed.IndexOf(":-->") - equation - 4) +
"]]>");
}
m = remove_mathml.Match(text);
}
XmlReader doc = null;
try
{
// The pure XmlReader is ~20x faster than the XmlTextReader.
doc = XmlReader.Create(new StringReader(text), settings);
//doc = new XmlTextReader(new StringReader(text));
using (StringWriter sw = new StringWriter())
{
xslt.Transform(doc, null, sw);
return sw.ToString().TrimEnd('\n');
}
}
catch (XmlException e)
{
Console.WriteLine(e.ToString());
Console.WriteLine(doc.ToString());
return String.Empty;
}
}
}
}
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