92 lines
3.2 KiB
C#
92 lines
3.2 KiB
C#
using System;
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using System.IO;
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using System.Text.RegularExpressions;
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using System.Xml;
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using System.Xml.Xsl;
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namespace Bind
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{
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class DocProcessor
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{
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static readonly Regex remove_mathml = new Regex(
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@"<(mml:math|inlineequation)[^>]*?>(?:.|\n)*?</\s*\1\s*>",
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RegexOptions.Compiled | RegexOptions.Multiline | RegexOptions.IgnorePatternWhitespace);
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static readonly XslCompiledTransform xslt = new XslCompiledTransform();
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static readonly XmlReaderSettings settings = new XmlReaderSettings();
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string Text;
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string LastFile;
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public DocProcessor(string transform_file)
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{
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xslt.Load(transform_file);
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settings.ProhibitDtd = false;
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settings.XmlResolver = null;
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}
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// Strips MathML tags from the source and replaces the equations with the content
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// found in the <!-- eqn: :--> comments in the docs.
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// Todo: Some simple MathML tags do not include comments, find a solution.
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// Todo: Some files include more than 1 function - find a way to map these extra functions.
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public string ProcessFile(string file)
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{
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if (LastFile == file)
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return Text;
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LastFile = file;
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Text = File.ReadAllText(file);
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Match m = remove_mathml.Match(Text);
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while (m.Length > 0)
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{
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string removed = Text.Substring(m.Index, m.Length);
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Text = Text.Remove(m.Index, m.Length);
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int equation = removed.IndexOf("eqn");
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if (equation > 0)
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{
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// Find the start and end of the equation string
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int eqn_start = equation + 4;
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int eqn_end = removed.IndexOf(":-->") - equation - 4;
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if (eqn_end < 0)
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{
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// Note: a few docs from man4 delimit eqn end with ": -->"
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eqn_end = removed.IndexOf(": -->") - equation - 4;
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}
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if (eqn_end < 0)
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{
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Console.WriteLine("[Warning] Failed to find equation for mml.");
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goto next;
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}
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string eqn_substring = removed.Substring(eqn_start, eqn_end);
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Text = Text.Insert(m.Index, "<![CDATA[" + eqn_substring + "]]>");
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}
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next:
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m = remove_mathml.Match(Text);
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}
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XmlReader doc = null;
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try
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{
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// The pure XmlReader is ~20x faster than the XmlTextReader.
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doc = XmlReader.Create(new StringReader(Text), settings);
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//doc = new XmlTextReader(new StringReader(text));
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using (StringWriter sw = new StringWriter())
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{
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xslt.Transform(doc, null, sw);
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Text = sw.ToString().TrimEnd('\r', '\n');
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return Text;
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}
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}
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catch (XmlException e)
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{
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Console.WriteLine(e.ToString());
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Console.WriteLine(doc.ToString());
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return String.Empty;
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}
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}
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}
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}
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