private static bool IsExpressionIdentifierStart(char c)
{
return(SqlTokenHelper.IsIdentifierStartCharacter(c) || char.IsWhiteSpace(c) ||
c == '"' || c == '\'' || c == '@');
}
private ExpressionWrapper ReadParameter()
{
var parameter = "";
var doubleQuotationCount = 0;
while (true)
{
if (_current == '\0')
{
break;
}
if (char.IsLetterOrDigit(_current) || _current == '_' || _current == '"')
{
if (_current == '"')
{
doubleQuotationCount++;
}
parameter += _current;
if (IsCharBreak())
{
break;
}
NextChar();
}
else if (_current == '.' && SqlTokenHelper.IsIdentifierStartCharacter(parameter[0]))
{
NextChar();
if (_propertyValues.ContainsKey(parameter))
{
var instance = CreateParameterExpression(parameter);
var param = _propertyValues[parameter];
var paramType = param.Type;
var prop = ReadProperty(instance.Expression, paramType);
return(prop);
}
throw new ExpressionEvaluateException(ExceptionMessageId.EspA011, _expressionText, parameter);
}
else
{
break;
}
}
if (doubleQuotationCount == 1 || doubleQuotationCount > 2)
{
throw new ExpressionEvaluateException(ExceptionMessageId.EspA014, _expressionText, parameter);
}
if (char.IsDigit(parameter[0]))
{
return(CreateNumericExpression(parameter));
}
if (parameter == "null")
{
return(CreateNullExpression(parameter));
}
if (parameter == "true" || parameter == "false")
{
return(CreateBooleanExpression(parameter));
}
if (parameter == "\"\"")
{
return(CreateEmptyStringExpression(parameter));
}
if (_propertyValues.ContainsKey(parameter))
{
return(CreateParameterExpression(parameter));
}
if (Regex.IsMatch(parameter, @"\"".*\"""))
{
return(CreateLiteralStringExpression(parameter));
}
throw new ExpressionEvaluateException(ExceptionMessageId.EspA011, _expressionText, parameter);
}
