FixedLengthLiteral.cs

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#region License
/* **********************************************************************************
 * Copyright (c) Roman Ivantsov
 * This source code is subject to terms and conditions of the MIT License
 * for Irony. A copy of the license can be found in the License.txt file
 * at the root of this distribution. 
 * By using this source code in any fashion, you are agreeing to be bound by the terms of the 
 * MIT License.
 * You must not remove this notice from this software.
 * **********************************************************************************/
#endregion

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Globalization;

namespace Irony.Parsing {

  //A terminal for representing fixed-length lexemes coming up sometimes in programming language
  // (in Fortran for ex, every line starts with 5-char label, followed by a single continuation char)
  // It may be also used to create grammar/parser for reading data files with fixed length fields
  public class FixedLengthLiteral : DataLiteralBase {
    public int Length;

    public FixedLengthLiteral(string name, int length, TypeCode dataType) : base(name, dataType) {
      Length = length;
    }

    protected override string ReadBody(ParsingContext context, ISourceStream source) {
      source.PreviewPosition = source.Location.Position + Length;
      var body = source.Text.Substring(source.Location.Position, Length);
      return body; 
    }

  }//class
  
}//namespace