#region License
//=============================================================================
// Vici Core - Productivity Library for .NET 3.5
//
// Copyright (c) 2008-2010 Philippe Leybaert
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
//=============================================================================
#endregion
using System;
namespace Vici.Core.Parser{
public class IntegerLiteralMatcher : ITokenMatcher, ITokenProcessor
{
private enum Stage
{
Num1,
Num2,
Suffix,
Done
}
private const string SUFFIXES = "FfDdMmUuLl";
private Stage _stage;
private char _suffix;
public ITokenProcessor CreateTokenProcessor()
{
return new IntegerLiteralMatcher();
}
public void ResetState()
{
_stage = Stage.Num1;
}
public TokenizerState ProcessChar(char c, string fullExpression, int currentIndex)
{
bool isDigit = (c >= '0' && c <= '9');
switch (_stage)
{
case Stage.Num1:
{
if (!isDigit)
return TokenizerState.Fail;
_stage = Stage.Num2;
}
break;
case Stage.Num2:
{
if (SUFFIXES.IndexOf(c) >= 0)
{
_stage = Stage.Suffix;
_suffix = c;
}
else if (!isDigit)
{
return TokenizerState.Success;
}
}
break;
case Stage.Suffix:
{
if ((_suffix == 'l' || _suffix == 'L') && (c == 'U' || c == 'u'))
{
_stage = Stage.Done;
}
else if ((_suffix == 'u' || _suffix == 'U') && (c == 'L' || c == 'l'))
{
_stage = Stage.Done;
}
else
{
return TokenizerState.Success;
}
}
break;
case Stage.Done:
return TokenizerState.Success;
}
return TokenizerState.Valid;
}
public string TranslateToken(string originalToken, ITokenProcessor tokenProcessor)
{
return originalToken;
}
}
}
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