public override Token Eval(TokenExtractor extractor)
{
EnsureExtractor(extractor, nameof(extractor));
// TODO: Remover tratamento de cursor do extrator
// Isso será garantido pelo anterior?
var cursor = extractor.SaveCursor();
try
{
var c = extractor.NextChar();
if (c == _char)
{
return(new Token(c)
{
ContentPosBegin = cursor.Position,
ContentLength = extractor.SaveCursor().Position - cursor.Position
});
}
}
catch (Exception)
{
extractor.RollbackCursor(cursor);
throw;
}
extractor.RollbackCursor(cursor);
return(null);
}
public override Token Eval(TokenExtractor extractor)
{
EnsureExtractor(extractor, nameof(extractor));
var cursor = extractor.SaveCursor();
var content = new List <Token>();
try
{
foreach (var grammarElement in _list)
{
var token = grammarElement.Eval(extractor);
if (token == null)
{
extractor.RollbackCursor(cursor);
return(null);
}
content.Add(token);
}
}
catch (Exception)
{
extractor.RollbackCursor(cursor);
throw;
}
return(new Token(content.ToArray())
{
ContentPosBegin = cursor.Position,
ContentLength = extractor.SaveCursor().Position - cursor.Position
});
}
public override Token Eval(TokenExtractor extractor)
{
EnsureExtractor(extractor, nameof(extractor));
var cursor = extractor.SaveCursor();
var content = new StringBuilder();
try
{
var token = base.Eval(extractor);
if (token == null)
{
extractor.RollbackCursor(cursor);
return(null);
}
foreach (var childToken in (token.Content as Token[]))
{
content.Append((char)childToken.Content);
}
}
catch (Exception)
{
extractor.RollbackCursor(cursor);
throw;
}
return(new Token(content.ToString())
{
ContentPosBegin = cursor.Position,
ContentLength = extractor.SaveCursor().Position - cursor.Position
});
}
public override Token Eval(TokenExtractor extractor)
{
EnsureExtractor(extractor, nameof(extractor));
var cursor = extractor.SaveCursor();
try
{
Token token = null;
foreach (var grammarElement in _list)
{
token = grammarElement.Eval(extractor);
if (token != null)
{
break;
}
}
if (token == null)
{
extractor.RollbackCursor(cursor);
return(null);
}
return(token);
}
catch (Exception)
{
extractor.RollbackCursor(cursor);
throw;
}
}
public override Token Eval(TokenExtractor extractor)
{
EnsureExtractor(extractor, nameof(extractor));
var cursor = extractor.SaveCursor();
var content = new List <Token>();
try
{
while (true)
{
var token = _element.Eval(extractor);
if (token == null)
{
break;
}
content.Add(token);
}
}
catch (Exception)
{
extractor.RollbackCursor(cursor);
throw;
}
// Se não achou nenhum token to elemento informado é inválido
if (content.Count < 1)
{
return(null);
}
return(new Token(content.ToArray())
{
ContentPosBegin = cursor.Position,
ContentLength = extractor.SaveCursor().Position - cursor.Position
});
}