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  • Committer: Alex Regueiro
  • Date: 2009-09-17 00:51:15 UTC
  • Revision ID: alexreg@gmail.com-20090917005115-wru7sxue0rko028j
Updated grammar specification. Added support for catching unexpected end of token stream. Parser now handles fractions, binomials, and square roots (with optional index argument). Added IsArgument property to ExpressionNode; handled by TreeTextRenderer class.

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TexDotNet/TexHelper.cs
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using System;
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using System.Collections.Generic;
 
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using System.IO;
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using System.Linq;
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using System.Text;
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namespace TexDotNet
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{
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    using TokenStream = IEnumerator<Token>;
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    public static class TexHelper
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    {
 
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        public static string CreateText(this ExpressionTree tree)
 
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        {
 
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            using (var stringWriter = new StringWriter())
 
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            {
 
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                var texWriter = new TexWriter(stringWriter);
 
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                texWriter.Write(tree);
 
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                return stringWriter.ToString();
 
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            }
 
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        }
 
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        public static string CreateText(this ExpressionNode node)
 
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        {
 
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            using (var stringWriter = new StringWriter())
 
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            {
 
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                var texWriter = new TexWriter(stringWriter);
 
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                texWriter.Write(node);
 
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                return stringWriter.ToString();
 
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            }
 
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        }
 
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        public static ExpressionTree CreateExpressionTree(string expression)
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        {
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            return ExpressionTree.FromParseTree(CreateParseTree(expression));
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            var lexer = new TexLexer();
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            return lexer.Tokenise(expression);
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        }
 
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        internal static void ForceMoveNext(this TokenStream tokenStream)
 
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        {
 
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            if (!tokenStream.MoveNext())
 
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                throw new ParserException(Token.Null, "Unexpected end of token stream.");
 
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        }
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    }
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}