public void ApplySelectPropertyFilter(QuerySelectProperty property, string filterText)
{
var filter = filterText?.Trim();
if (string.IsNullOrWhiteSpace(filter))
{
// find and remove previous condition
}
else
{
// add new condition
var filterOperator = "=";
var operators = _resolver.GetCompareOperators();
foreach (var o in operators)
{
if (filter.StartsWith(o))
{
filterOperator = o;
filter = filter.Substring(o.Count()).Trim();
break;
}
}
;
var filterValue = filter;
char quote = _resolver.GetStringLiteralSymbol();
if (filterValue.First() != '@' && (property.StoreProperty.Type == "String" || property.StoreProperty.Type == "DateTime"))
{
if (filterValue.First() != quote)
{
filterValue = quote + filterValue;
}
if (filterValue.Last() != quote)
{
filterValue = filterValue + quote;
}
}
if (!string.IsNullOrWhiteSpace(SelectedQuery.WhereClause))
{
SelectedQuery.WhereClause += " AND ";
}
SelectedQuery.WhereClause += $"{property.FromTable.Alias}.{property.StoreProperty.Name} {filterOperator} {filterValue}";
}
}
// Read the next token from the input stream
public void NextToken()
{
// Skip whitespace
while (char.IsWhiteSpace(_currentChar))
{
NextChar();
}
if (_operators.Contains(_currentChar.ToString().ToLower()))
{
_currentToken = Token.Operator;
var current = _currentChar.ToString();
NextChar();
Operator = current;
return;
}
// Special characters
switch (_currentChar)
{
case '\0':
_currentToken = Token.EOF;
return;
//case '+':
// NextChar();
// _currentToken = Token.Add;
// return;
//case '-':
// NextChar();
// _currentToken = Token.Subtract;
// return;
//case '*':
// NextChar();
// _currentToken = Token.Multiply;
// return;
//case '/':
// NextChar();
// _currentToken = Token.Divide;
// return;
case '(':
NextChar();
_currentToken = Token.OpenParens;
return;
case ')':
NextChar();
_currentToken = Token.CloseParens;
return;
case ',':
NextChar();
_currentToken = Token.Comma;
return;
}
// Number?
if (char.IsDigit(_currentChar) || _currentChar == '.')
{
// Capture digits/decimal point
var sb = new StringBuilder();
bool haveDecimalPoint = false;
while (char.IsDigit(_currentChar) || (!haveDecimalPoint && _currentChar == '.'))
{
sb.Append(_currentChar);
haveDecimalPoint = _currentChar == '.';
NextChar();
}
// Parse it
Number = decimal.Parse(sb.ToString(), CultureInfo.InvariantCulture);
_currentToken = Token.Number;
return;
}
// Field - starts with letter or underscore
// also may be operator
if (char.IsLetter(_currentChar) || _currentChar == '_')
{
var sb = new StringBuilder();
// Accept letter, digit or underscore
while (char.IsLetterOrDigit(_currentChar) || _currentChar == '_' || _currentChar == '.')
{
sb.Append(_currentChar);
NextChar();
}
var sbs = sb.ToString();
if (_operators.Contains(sbs.ToLower()))
{
_currentToken = Token.Operator;
Operator = sbs;
return;
}
// Setup token
Field = sbs;
_currentToken = Token.Field;
return;
}
// Param - starts with letter or underscore
if (_currentChar == '@')
{
var sb = new StringBuilder();
sb.Append(_currentChar);
NextChar();
// starts from letters and _
if (char.IsLetter(_currentChar) || _currentChar == '_')
{
sb.Append(_currentChar);
NextChar();
}
// Accept letter, digit or underscore
while (char.IsLetterOrDigit(_currentChar) || _currentChar == '_')
{
sb.Append(_currentChar);
NextChar();
}
// Setup token
Param = sb.ToString();
_currentToken = Token.Param;
return;
}
// string literal
if (_currentChar == _resolver.GetStringLiteralSymbol())
{
var sb = new StringBuilder();
NextChar();
while (_currentChar != _resolver.GetStringLiteralSymbol())
{
sb.Append(_currentChar);
NextChar();
}
NextChar();
StringLiteral = sb.ToString();
_currentToken = Token.StringLiteral;
return;
}
throw new Exception($"Illigal literal '{_currentChar}'");
}
