public void LogicalStandaloneExpressionTest()
{
Dictionary <string, object> valueStack = new Dictionary <string, object>();
valueStack.Add("str", "test");
valueStack.Add("int", 5);
valueStack.Add("date", new DateTime(1989, 11, 14));
ExpressionFactory factory = new ExpressionFactory(valueStack);
factory.AddParameter("date", new DateTime(2012, 1, 1));
factory.AddParameter("null", null);
bool expected = (string)factory.ValueStack["str"] == "test" &&
((int)factory.ValueStack["int"] >= 5 || (DateTime)factory.ValueStack["date"] != new DateTime(1989, 11, 14) &&
((DateTime)factory.Parameters["date"]).AddYears(1).Year < 2000) &&
((string)factory.ValueStack["str"]).Contains("na");
var func = factory.BuildLogicalExpression(@"
$str == 'test'
&& ( $int >= 5 || $date != 1989.11.14)
&& @date.AddYears(1).Year > 2000
&& $str.Contains('na')
&& @null == NuLL");
bool actual = func(null);
Assert.AreEqual(expected, actual);
}
public ProxyCollection <T> Where(string predicate, IEnumerable conditionParameters)
{
Dictionary <string, object> parameters = new Dictionary <string, object>();
int i = 1;
foreach (var parameter in conditionParameters)
{
object p = parameter;
// it is need for calculating linq
IEnumerable enumerable = parameter as IEnumerable;
if (enumerable != null && !(parameter is string))
{
ArrayList list = new ArrayList();
foreach (var item in enumerable)
{
list.Add(item);
}
p = list;
}
parameters.Add(string.Format("p{0}", i), p);
i++;
}
ExpressionFactory factory = new ExpressionFactory(_context, typeof(T), parameters);
Func <object, bool> func = factory.BuildLogicalExpression(predicate);
IEnumerable <T> c = _collection.Where <T>(val => func(val));
return(new ProxyCollection <T>(c, _context));
}
public bool BooleanExpression(String expression, object root = null)
{
if (expression.StartsWith("$") && expression.Contains("("))
{
return((bool)CallScript(expression));
}
if (expression.StartsWith("@"))
{
return((bool)CallVariable(expression));
}
ExpressionFactory factory = new ExpressionFactory(this.Values);
Func <object, bool> func = factory.BuildLogicalExpression(expression);
return(func(null));
}