public static ExpressionNode Parse(String expression)
{
if (String.IsNullOrEmpty(expression))
{
return(new OperatorNode {
Value = double.NaN
});
}
expression = expression.Trim();
if (ExpressionHelper.IsNumber(expression))
{
var node = new ExpressionNode
{
Value = ExpressionHelper.GetNumber(expression),
ValueType = ValueTypes.Number,
};
return(node);
}
if (ExpressionHelper.IsString(expression))
{
var node = new StringValueNode
{
Value = ExpressionHelper.GetString(expression),
Quota = ExpressionHelper.GetQuota(expression),
ValueType = ValueTypes.String,
};
return(node);
}
if (ExpressionHelper.IsDateTime(expression))
{
var node = new ExpressionNode
{
Value = ExpressionHelper.GetDateTime(expression),
ValueType = ValueTypes.DateTime,
};
return(node);
}
int parentheses = 0;
var leftExp = String.Empty;
var rightExp = String.Empty;
var currOperator = String.Empty;
var currPriority = -1;
bool singleQuoteOpen = false;
bool doubleQuoteOpen = false;
for (int i = 0; i < expression.Length; i++)
{
var @char = expression[i];
if (@char == '\'' && !doubleQuoteOpen)
{
singleQuoteOpen = !singleQuoteOpen;
}
if (@char == '"' && !singleQuoteOpen)
{
doubleQuoteOpen = !doubleQuoteOpen;
}
if (singleQuoteOpen || doubleQuoteOpen)
{
continue;
}
if (@char == '(')
{
parentheses++;
}
else if (@char == ')')
{
parentheses--;
}
else if (parentheses == 0)
{
if (reservedSymbols.Contains(@char) && i != 0)
{
int operatorStart = i;
while (reservedSymbols.Contains(@char))
{
@char = expression[++i];
}
int operatorEnd = i--;
var @operator = expression.Substring(operatorStart, operatorEnd - operatorStart).Trim();
int priority;
if (!operators.TryGetValue(@operator, out priority))
{
throw new Exception(String.Format("Unknown operator \"{0}\"", @operator));
}
if (currPriority < priority)
{
currOperator = @operator;
currPriority = priority;
leftExp = expression.Substring(0, operatorStart).Trim();
rightExp = expression.Substring(operatorEnd).Trim();
}
}
}
}
if (parentheses > 0)
{
throw new Exception(String.Format("Missing ) in \"{0}\"", expression));
}
if (parentheses < 0)
{
throw new Exception(String.Format("Too many )s in \"{0}\"", expression));
}
if (expression.StartsWith("(") && expression.EndsWith(")"))
{
var firstClosingBracketIndex = expression.IndexOf(")", StringComparison.OrdinalIgnoreCase);
var nextOpeningBracketIndex = expression.IndexOf("(", 1, StringComparison.OrdinalIgnoreCase);
if (nextOpeningBracketIndex < firstClosingBracketIndex)
{
var subNode = Parse(expression.Substring(1, expression.Length - 2));
return(subNode);
}
}
if (ExpressionHelper.IsEmptyOrSpace(currOperator))
{
var actionName = String.Empty;
var innerExp = String.Empty;
for (int i = 0; i < expression.Length; i++)
{
if (!reservedSymbols.Contains(expression[i]))
{
innerExp = expression.Substring(i);
break;
}
actionName += expression[i];
}
if (!String.IsNullOrEmpty(actionName) &&
actionName != "-" &&
actionName != "--" &&
actionName != "+" &&
actionName != "++" &&
actionName != "!")
{
throw new Exception();
}
var openingBracketIndex = expression.IndexOf("(", StringComparison.OrdinalIgnoreCase);
if (openingBracketIndex > 0 && expression.EndsWith(")"))
{
if (operators.ContainsKey(actionName))
{
var subNode = new OperatorNode
{
Action = actionName,
ActionType = ActionTypes.Operator,
Right = Parse(innerExp)
};
return(subNode);
}
actionName = expression.Substring(0, openingBracketIndex);
innerExp = expression.Substring(openingBracketIndex + 1, innerExp.Length - openingBracketIndex - 2);
var funcNode = new FunctionNode
{
Action = actionName,
ActionType = ActionTypes.Function,
};
if (!ExpressionHelper.IsEmptyOrSpace(innerExp))
{
var paramsArr = SplitParams(innerExp);
foreach (var paramExp in paramsArr)
{
if (ExpressionHelper.IsEmptyOrSpace(paramExp))
{
var node = new ExpressionNode();
funcNode.Params.Add(node);
}
else
{
var node = Parse(paramExp);
funcNode.Params.Add(node);
}
}
}
return(funcNode);
}
var varNode = new ExpressionNode
{
Action = innerExp,
ValueType = ValueTypes.Variable,
};
if (String.IsNullOrEmpty(actionName))
{
return(varNode);
}
var actNode = new OperatorNode
{
Action = actionName,
ActionType = ActionTypes.Operator,
Right = varNode,
};
return(actNode);
}
var operNode = new OperatorNode
{
Action = currOperator,
ActionType = ActionTypes.Operator,
Left = Parse(leftExp),
Right = Parse(rightExp)
};
return(operNode);
}
public static Object Eval(ExpressionNode node, IDataResolver dataResolver)
{
var @params = new List <Object>();
foreach (var paramNode in node.Params)
{
if (paramNode != null)
{
var value = (Object)null;
if (@params.Count == 0)
{
value = ExpressionEvaluator.Eval(paramNode, dataResolver);
}
else if (lazyFuncs.Contains(node.Action))
{
value = paramNode;
}
else
{
value = ExpressionEvaluator.Eval(paramNode, dataResolver);
}
@params.Add(value);
}
}
switch (node.Action.ToLower())
{
case "sqrt":
return(Math.Sqrt(ExpressionHelper.GetNumber(@params[0])));
case "sin":
return(Math.Sin(ExpressionHelper.GetNumber(@params[0])));
case "cos":
return(Math.Cos(ExpressionHelper.GetNumber(@params[0])));
case "tan":
return(Math.Tan(ExpressionHelper.GetNumber(@params[0])));
case "asin":
return(Math.Asin(ExpressionHelper.GetNumber(@params[0])));
case "acos":
return(Math.Acos(ExpressionHelper.GetNumber(@params[0])));
case "atan":
return(Math.Atan(ExpressionHelper.GetNumber(@params[0])));
case "abs":
return(Math.Abs(ExpressionHelper.GetNumber(@params[0])));
case "atan2":
return(Math.Atan2(ExpressionHelper.GetNumber(@params[0]), ExpressionHelper.GetNumber(@params[1])));
case "ceil":
return(Math.Ceiling(ExpressionHelper.GetNumber(@params[0])));
case "cosh":
return(Math.Cosh(ExpressionHelper.GetNumber(@params[0])));
case "exp":
return(Math.Exp(ExpressionHelper.GetNumber(@params[0])));
case "floor":
return(Math.Floor(ExpressionHelper.GetNumber(@params[0])));
case "log":
return(Math.Log(ExpressionHelper.GetNumber(@params[0])));
case "log10":
return(Math.Log10(ExpressionHelper.GetNumber(@params[0])));
case "rnd":
{
var len = 8D;
if (@params.Count > 0)
{
len = ExpressionHelper.GetNumber(@params[0]);
len = (len < 1 ? 8D : len);
}
var max = Math.Pow(10, len) - 1D;
var rnd = new Random();
return(rnd.Next(0, (int)max));
}
case "round":
{
if (@params.Count > 1)
{
return(Math.Round(ExpressionHelper.GetNumber(@params[0]), (int)ExpressionHelper.GetNumber(@params[1])));
}
return(Math.Round(ExpressionHelper.GetNumber(@params[0])));
}
case "sign":
return(Math.Sign(ExpressionHelper.GetNumber(@params[0])));
case "sinh":
return(Math.Sinh(ExpressionHelper.GetNumber(@params[0])));
case "tanh":
return(Math.Tanh(ExpressionHelper.GetNumber(@params[0])));
case "trunc":
return(Math.Truncate(ExpressionHelper.GetNumber(@params[0])));
case "pow":
return(Math.Pow(ExpressionHelper.GetNumber(@params[0]), ExpressionHelper.GetNumber(@params[1])));
case "or":
return((long)ExpressionHelper.GetNumber(@params[0]) | (long)ExpressionHelper.GetNumber(@params[1]));
case "and":
return((long)ExpressionHelper.GetNumber(@params[0]) & (long)ExpressionHelper.GetNumber(@params[1]));
case "xor":
return((long)ExpressionHelper.GetNumber(@params[0]) ^ (long)ExpressionHelper.GetNumber(@params[1]));
case "mod":
return(ExpressionHelper.GetNumber(@params[0]) % ExpressionHelper.GetNumber(@params[1]));
case "len":
{
var val = @params[0];
if (val == null)
{
return(0);
}
if (val is ICollection)
{
return(((ICollection)val).Count);
}
var type = val.GetType();
if (ExpressionHelper.IsListOrDictionary(val))
{
var countProperty = type.GetProperty("Count");
if (countProperty == null)
{
return(0);
}
return(countProperty.GetValue(val));
}
var strVal = Convert.ToString(val);
return(strVal.Length);
}
case "set":
{
var name = Convert.ToString(@params[0]);
dataResolver.SetValue(name, @params[1]);
return(true);
}
case "get":
{
var val = @params[0];
if (val == null)
{
return(null);
}
if (val is IList)
{
var list = (IList)val;
return(list[0]);
}
var type = val.GetType();
if (ExpressionHelper.IsListOrDictionary(type))
{
var properties = type.GetProperties();
var indexerProperty = properties.FirstOrDefault(n => n.GetIndexParameters().Length > 0);
if (indexerProperty != null)
{
var idxParams = new[] { @params[1] };
var result = indexerProperty.GetValue(val, idxParams);
return(result);
}
}
var idx = (int)ExpressionHelper.GetNumber(@params[1]);
var strVal = Convert.ToString(val);
return(strVal[idx]);
}
case "join":
{
var val = @params[0];
if (val == null)
{
return(null);
}
var coll = val as ICollection;
if (coll == null)
{
return(val);
}
var separator = Convert.ToString(@params[1]);
return(String.Join(separator, coll.OfType <Object>()));
}
case "concat":
{
var val = @params[0];
if (val == null)
{
return(null);
}
var coll = val as ICollection;
if (coll == null)
{
return(val);
}
return(String.Concat(coll.OfType <Object>()));
}
case "format":
{
var format = Convert.ToString(@params[0]);
var args = new Object[@params.Count - 1];
@params.CopyTo(1, args, 0, args.Length);
return(String.Format(format, args));
}
case "substring":
{
var text = Convert.ToString(@params[0]);
var index = (int)ExpressionHelper.GetNumber(@params[1]);
var length = (@params.Count > 2 ? (int)ExpressionHelper.GetNumber(@params[2]) : text.Length);
length = Math.Min(length, text.Length - index);
return(text.Substring(index, length));
}
case "getdatetime":
{
var currDate = DateTime.Now;
if (@params.Count == 0)
{
return(currDate);
}
var year = (int)ExpressionHelper.GetNumber(@params.Count > 0 ? @params[0] : currDate.Year);
var month = (int)ExpressionHelper.GetNumber(@params.Count > 1 ? @params[1] : currDate.Month);
var day = (int)ExpressionHelper.GetNumber(@params.Count > 2 ? @params[2] : currDate.Day);
var hour = (int)ExpressionHelper.GetNumber(@params.Count > 3 ? @params[3] : currDate.Hour);
var minute = (int)ExpressionHelper.GetNumber(@params.Count > 4 ? @params[4] : currDate.Minute);
var second = (int)ExpressionHelper.GetNumber(@params.Count > 5 ? @params[5] : currDate.Second);
var milisecond = (int)ExpressionHelper.GetNumber(@params.Count > 6 ? @params[6] : currDate.Millisecond);
return(new DateTime(year, month, day, hour, minute, second, milisecond));
}
case "getdate":
{
var currDate = DateTime.Now.Date;
if (@params.Count == 0)
{
return(currDate);
}
var year = (int)ExpressionHelper.GetNumber(@params.Count > 0 ? @params[0] : currDate.Year);
var month = (int)ExpressionHelper.GetNumber(@params.Count > 1 ? @params[1] : currDate.Month);
var day = (int)ExpressionHelper.GetNumber(@params.Count > 2 ? @params[2] : currDate.Day);
return(new DateTime(year, month, day));
}
case "isempty":
{
var val = @params[0];
if (val == null)
{
return(true);
}
if (val is ICollection)
{
return(((ICollection)val).Count == 0);
}
var type = val.GetType();
if (ExpressionHelper.IsListOrDictionary(val))
{
var countProperty = type.GetProperty("Count");
if (countProperty == null)
{
return(true);
}
var count = (int)countProperty.GetValue(val);
return(count == 0);
}
var strVal = Convert.ToString(val);
return(strVal.Length == 0);
}
case "isdate":
return(ExpressionHelper.IsDateTime(@params[0]));
case "isday":
{
var input = Convert.ToString(@params[0]);
return(dayRx.IsMatch(input));
}
case "ismonth":
{
var input = Convert.ToString(@params[0]);
return(monthRx.IsMatch(input));
}
case "isyear":
{
var input = Convert.ToString(@params[0]);
return(yearRx.IsMatch(input));
}
case "isnumber":
{
return(ExpressionHelper.IsNumber(@params[0]));
}
case "isinteger":
{
return(ExpressionHelper.IsInteger(@params[0]));
}
case "rgx":
{
var input = Convert.ToString(@params[0]);
var pattern = Convert.ToString(@params[1]);
return(Regex.IsMatch(input, pattern));
}
case "min":
{
if (!(@params[0] is String) && @params[0] is IEnumerable)
{
var val = (Object)null;
var list = (IEnumerable)@params[0];
foreach (var item in list)
{
if (item == null)
{
continue;
}
var order = ExpressionHelper.Compare(val, item);
if (order < 0)
{
val = item;
}
}
return(val);
}
var query = (from n in @params
let m = ExpressionHelper.GetNumber(n)
select m);
return(query.Min());
}
case "max":
{
if (!(@params[0] is String) && @params[0] is IEnumerable)
{
var val = (Object)null;
var list = (IEnumerable)@params[0];
foreach (var item in list)
{
if (item == null)
{
continue;
}
if (val == null)
{
val = item;
}
else
{
var order = ExpressionHelper.Compare(val, item);
if (order > 0)
{
val = item;
}
}
}
return(val);
}
var query = (from n in @params
let m = ExpressionHelper.GetNumber(n)
select m);
return(query.Max());
}
case "avg":
{
if (!(@params[0] is String) && @params[0] is IEnumerable)
{
var val = 0D;
var count = 0;
var list = (IEnumerable)@params[0];
foreach (var item in list)
{
if (item == null)
{
continue;
}
val += ExpressionHelper.GetNumber(item);
count++;
}
return(val / count);
}
var query = (from n in @params
let m = ExpressionHelper.GetNumber(n)
select m);
return(query.Average());
}
case "sum":
{
if (!(@params[0] is String) && @params[0] is IEnumerable)
{
var val = 0D;
var list = (IEnumerable)@params[0];
foreach (var item in list)
{
if (item == null)
{
continue;
}
val += ExpressionHelper.GetNumber(item);
}
return(val);
}
var query = (from n in @params
let m = ExpressionHelper.GetNumber(n)
select m);
return(query.Sum());
}
case "all":
{
if (!(@params[0] is String) && @params[0] is IEnumerable)
{
var conditionNde = (ExpressionNode)@params[1];
var dictionary = new Dictionary <String, Object> {
["@"] = null
};
var subResolver = new DefaultDataResolver(dictionary, dataResolver);
var list = (IEnumerable)@params[0];
foreach (var item in list)
{
subResolver.SetValue("@", item);
var res = ExpressionEvaluator.Eval(conditionNde, subResolver);
if (!Convert.ToBoolean(res))
{
return(false);
}
}
return(true);
}
return(false);
}
case "any":
{
if (!(@params[0] is String) && @params[0] is IEnumerable)
{
var conditionNde = (ExpressionNode)@params[1];
var dictionary = new Dictionary <String, Object> {
["@"] = null
};
var subResolver = new DefaultDataResolver(dictionary, dataResolver);
var list = (IEnumerable)@params[0];
foreach (var item in list)
{
subResolver.SetValue("@", item);
var res = ExpressionEvaluator.Eval(conditionNde, subResolver);
if (Convert.ToBoolean(res))
{
return(true);
}
}
}
return(false);
}
case "single":
{
if (!(@params[0] is String) && @params[0] is IEnumerable)
{
var selectorNode = (ExpressionNode)null;
if (@params.Count > 1)
{
selectorNode = (ExpressionNode)@params[1];
}
var conditionNode = (ExpressionNode)null;
if (@params.Count > 2)
{
conditionNode = (ExpressionNode)@params[2];
}
var dictionary = new Dictionary <String, Object> {
["@"] = null
};
var subResolver = new DefaultDataResolver(dictionary, dataResolver);
var list = (IEnumerable)@params[0];
var flag = false;
var result = (object)null;
foreach (var item in list)
{
subResolver.SetValue("@", item);
if (flag)
{
throw new Exception();
}
if (conditionNode != null)
{
var res = ExpressionEvaluator.Eval(conditionNode, subResolver);
if (!Convert.ToBoolean(res))
{
continue;
}
}
if (selectorNode == null)
{
result = item;
}
else
{
result = ExpressionEvaluator.Eval(selectorNode, subResolver);
}
flag = true;
}
return(result);
}
return(null);
}
case "first":
{
if (!(@params[0] is String) && @params[0] is IEnumerable)
{
var selectorNode = (ExpressionNode)null;
if (@params.Count > 1)
{
selectorNode = (ExpressionNode)@params[1];
}
var conditionNode = (ExpressionNode)null;
if (@params.Count > 2)
{
conditionNode = (ExpressionNode)@params[2];
}
var dictionary = new Dictionary <String, Object> {
["@"] = null
};
var subResolver = new DefaultDataResolver(dictionary, dataResolver);
var list = (IEnumerable)@params[0];
foreach (var item in list)
{
subResolver.SetValue("@", item);
if (conditionNode != null)
{
var res = ExpressionEvaluator.Eval(conditionNode, subResolver);
if (!Convert.ToBoolean(res))
{
continue;
}
}
if (selectorNode == null)
{
return(item);
}
var obj = ExpressionEvaluator.Eval(selectorNode, subResolver);
return(obj);
}
}
return(null);
}
case "last":
{
var result = (Object)null;
if (!(@params[0] is String) && @params[0] is IEnumerable)
{
var selectorNode = (ExpressionNode)null;
if (@params.Count > 1)
{
selectorNode = (ExpressionNode)@params[1];
}
var conditionNode = (ExpressionNode)null;
if (@params.Count > 2)
{
conditionNode = (ExpressionNode)@params[2];
}
var dictionary = new Dictionary <String, Object> {
["@"] = null
};
var subResolver = new DefaultDataResolver(dictionary, dataResolver);
var list = (IEnumerable)@params[0];
foreach (var item in list)
{
subResolver.SetValue("@", item);
if (conditionNode != null)
{
var res = ExpressionEvaluator.Eval(conditionNode, subResolver);
if (!Convert.ToBoolean(res))
{
continue;
}
}
if (selectorNode == null)
{
result = item;
continue;
}
result = ExpressionEvaluator.Eval(selectorNode, subResolver);
}
}
return(result);
}
case "skip":
{
var result = new List <Object>();
if (!(@params[0] is String) && @params[0] is IEnumerable)
{
var list = (IEnumerable)@params[0];
var count = ExpressionHelper.GetNumber(@params[1]);
foreach (var item in list)
{
if (count <= 0D)
{
result.Add(item);
}
count--;
}
}
return(result.ToArray());
}
case "take":
{
var result = new List <Object>();
if (!(@params[0] is String) && @params[0] is IEnumerable)
{
var list = (IEnumerable)@params[0];
var count = ExpressionHelper.GetNumber(@params[1]);
foreach (var item in list)
{
if (result.Count == count)
{
break;
}
result.Add(item);
}
}
return(result.ToArray());
}
case "sortasc":
{
var items = new List <DictionaryEntry>();
if (!(@params[0] is String) && @params[0] is IEnumerable)
{
var selectorNode = (ExpressionNode)null;
if (@params.Count > 1)
{
selectorNode = (ExpressionNode)@params[1];
}
var dictionary = new Dictionary <String, Object> {
["@"] = null
};
var subResolver = new DefaultDataResolver(dictionary, dataResolver);
var list = (IEnumerable)@params[0];
foreach (var item in list)
{
subResolver.SetValue("@", item);
var key = item;
if (selectorNode != null)
{
key = ExpressionEvaluator.Eval(selectorNode, subResolver);
}
var entry = new DictionaryEntry(key, item);
items.Add(entry);
}
}
var ordered = items.OrderBy(n => n.Key, ExpressionHelper.Comparer);
var result = ordered.Select(n => n.Value);
return(result.ToArray());
}
case "sortdesc":
{
var items = new List <DictionaryEntry>();
if (!(@params[0] is String) && @params[0] is IEnumerable)
{
var selectorNode = (ExpressionNode)null;
if (@params.Count > 1)
{
selectorNode = (ExpressionNode)@params[1];
}
var dictionary = new Dictionary <String, Object> {
["@"] = null
};
var subResolver = new DefaultDataResolver(dictionary, dataResolver);
var list = (IEnumerable)@params[0];
foreach (var item in list)
{
subResolver.SetValue("@", item);
var key = item;
if (selectorNode != null)
{
key = ExpressionEvaluator.Eval(selectorNode, subResolver);
}
var entry = new DictionaryEntry(key, item);
items.Add(entry);
}
}
var ordered = items.OrderByDescending(n => n.Key, ExpressionHelper.Comparer);
var result = ordered.Select(n => n.Value);
return(result.ToArray());
}
case "select":
{
var result = new List <Object>();
if (!(@params[0] is String) && @params[0] is IEnumerable)
{
var selectorNode = (ExpressionNode)null;
if (@params.Count > 1)
{
selectorNode = (ExpressionNode)@params[1];
}
var conditionNode = (ExpressionNode)null;
if (@params.Count > 2)
{
conditionNode = (ExpressionNode)@params[2];
}
var dictionary = new Dictionary <String, Object> {
["@"] = null
};
var subResolver = new DefaultDataResolver(dictionary, dataResolver);
var list = (IEnumerable)@params[0];
foreach (var item in list)
{
subResolver.SetValue("@", item);
if (conditionNode != null)
{
var res = ExpressionEvaluator.Eval(conditionNode, subResolver);
if (!Convert.ToBoolean(res))
{
continue;
}
}
if (selectorNode == null)
{
result.Add(item);
continue;
}
var obj = ExpressionEvaluator.Eval(selectorNode, subResolver);
result.Add(obj);
}
}
return(result.ToArray());
}
case "if":
{
var flag = Convert.ToBoolean(@params[0]);
var trueNode = (ExpressionNode)@params[1];
var falseNode = (ExpressionNode)@params[2];
if (flag)
{
return(ExpressionEvaluator.Eval(trueNode, dataResolver));
}
return(ExpressionEvaluator.Eval(falseNode, dataResolver));
}
case "switch":
{
if (@params.Count % 2 > 0)
{
throw new ArgumentOutOfRangeException();
}
var switchValue = @params[0];
for (int i = 1; i < @params.Count; i += 2)
{
var caseValue = @params[i];
var resultNode = (ExpressionNode)@params[i + 1];
if (Equals(switchValue, caseValue))
{
return(ExpressionEvaluator.Eval(resultNode, dataResolver));
}
}
var defNode = (ExpressionNode)@params[@params.Count - 1];
return(ExpressionEvaluator.Eval(defNode, dataResolver));
}
case "comp":
return(ExpressionHelper.Compare(@params[0], @params[1]));
case "lower":
return(Convert.ToString(@params[0]).ToLower());
case "upper":
return(Convert.ToString(@params[0]).ToUpper());
case "contains":
{
var collection = @params[0];
if (collection == null)
{
return(null);
}
var item = @params[1];
if (item == null)
{
return(null);
}
if (collection is IDictionary)
{
var dictionary = (IDictionary)collection;
return(dictionary.Contains(item));
}
var type = collection.GetType();
if (type.IsGenericType)
{
var genericTypeDef = type.GetGenericTypeDefinition();
if (genericTypeDef == typeof(ISet <>) ||
genericTypeDef == typeof(IList <>) ||
genericTypeDef == typeof(IDictionary <,>))
{
var itemMethod = type.GetMethod("ContainsKey");
if (itemMethod == null)
{
itemMethod = type.GetMethod("Contains");
}
return(itemMethod.Invoke(collection, new[] { item }));
}
}
if (collection is IEnumerable && !(collection is String))
{
var list = (IEnumerable)collection;
var query = (from n in list.OfType <Object>()
where ExpressionHelper.Compare(n, item) == 0
select n);
return(query.Any());
}
var strValue = Convert.ToString(collection);
return(strValue.Contains(Convert.ToString(item)));
}
case "startswith":
{
var strValue = Convert.ToString(@params[0]);
return(strValue.StartsWith(Convert.ToString(@params[1])));
}
case "endswith":
{
var strValue = Convert.ToString(@params[0]);
return(strValue.EndsWith(Convert.ToString(@params[1])));
}
case "split":
{
var result = new String[0];
if (@params.Count > 1)
{
var strValue = Convert.ToString(@params[0]);
var delimiter = Convert.ToString(@params[1]);
if (!ExpressionHelper.IsEmptyOrSpace(strValue) &&
!ExpressionHelper.IsEmptyOrSpace(delimiter))
{
var delimites = new[] { delimiter };
result = strValue.Split(delimites, StringSplitOptions.None);
}
}
return(result);
}
case "trim":
{
var strValue = Convert.ToString(@params[0]);
return(strValue.Trim());
}
case "ltrim":
{
var strValue = Convert.ToString(@params[0]);
return(strValue.TrimStart());
}
case "rtrim":
{
var strValue = Convert.ToString(@params[0]);
return(strValue.TrimEnd());
}
case "getdaysinmonth":
{
if (ExpressionHelper.IsDateTime(@params[0]))
{
var dateValue = ExpressionHelper.GetDateTime(@params[0]);
return(DateTime.DaysInMonth(dateValue.Year, dateValue.Month));
}
var currDate = DateTime.Now.Date;
var year = (int)ExpressionHelper.GetNumber(@params.Count > 0 ? @params[0] : currDate.Year);
var month = (int)ExpressionHelper.GetNumber(@params.Count > 1 ? @params[1] : currDate.Month);
return(DateTime.DaysInMonth(year, month));
}
case "getyear":
case "getyears":
{
if (@params.Count == 0)
{
return(DateTime.Now.Year);
}
var dateValue = ExpressionHelper.GetDateTime(@params[0]);
return(dateValue.Year);
}
case "getmonth":
case "getmonths":
{
if (@params.Count == 0)
{
return(DateTime.Now.Month);
}
var dateValue = ExpressionHelper.GetDateTime(@params[0]);
return(dateValue.Month);
}
case "getday":
case "getdays":
case "getdayofmonth":
{
if (@params.Count == 0)
{
return(DateTime.Now.Day);
}
var dateValue = ExpressionHelper.GetDateTime(@params[0]);
return(dateValue.Day);
}
case "getdayofweek":
{
var dateValue = ExpressionHelper.GetDateTime(@params[0]);
return(dateValue.DayOfWeek);
}
case "getdayofyear":
{
var dateValue = ExpressionHelper.GetDateTime(@params[0]);
return(dateValue.DayOfYear);
}
case "gethours":
{
var dateValue = ExpressionHelper.GetDateTime(@params[0]);
return(dateValue.Hour);
}
case "getminutes":
{
var dateValue = ExpressionHelper.GetDateTime(@params[0]);
return(dateValue.Minute);
}
case "getseconds":
{
var dateValue = ExpressionHelper.GetDateTime(@params[0]);
return(dateValue.Second);
}
case "gettotaldays":
{
var dateValue = ExpressionHelper.GetDateTime(@params[0]);
var timeSpan = TimeSpan.FromTicks(dateValue.Ticks);
return(timeSpan.TotalDays);
}
case "gettotalhours":
{
var dateValue = ExpressionHelper.GetDateTime(@params[0]);
var timeSpan = TimeSpan.FromTicks(dateValue.Ticks);
return(timeSpan.TotalHours);
}
case "gettotalminutes":
{
var dateValue = ExpressionHelper.GetDateTime(@params[0]);
var timeSpan = TimeSpan.FromTicks(dateValue.Ticks);
return(timeSpan.TotalMinutes);
}
case "gettotalseconds":
{
var dateValue = ExpressionHelper.GetDateTime(@params[0]);
var timeSpan = TimeSpan.FromTicks(dateValue.Ticks);
return(timeSpan.TotalSeconds);
}
case "gettotalmiliseconds":
{
var dateValue = ExpressionHelper.GetDateTime(@params[0]);
var timeSpan = TimeSpan.FromTicks(dateValue.Ticks);
return(timeSpan.TotalMilliseconds);
}
case "addyears":
{
var dateValue = ExpressionHelper.GetDateTime(@params[0]);
return(dateValue.AddYears((int)ExpressionHelper.GetNumber(@params[1])));
}
case "addmonths":
{
var dateValue = ExpressionHelper.GetDateTime(@params[0]);
return(dateValue.AddMonths((int)ExpressionHelper.GetNumber(@params[1])));
}
case "adddays":
{
var dateValue = ExpressionHelper.GetDateTime(@params[0]);
return(dateValue.AddDays((int)ExpressionHelper.GetNumber(@params[1])));
}
case "addhours":
{
var dateValue = ExpressionHelper.GetDateTime(@params[0]);
return(dateValue.AddHours((int)ExpressionHelper.GetNumber(@params[1])));
}
case "addminutes":
{
var dateValue = ExpressionHelper.GetDateTime(@params[0]);
return(dateValue.AddMinutes((int)ExpressionHelper.GetNumber(@params[1])));
}
case "addseconds":
{
var dateValue = ExpressionHelper.GetDateTime(@params[0]);
return(dateValue.AddSeconds((int)ExpressionHelper.GetNumber(@params[1])));
}
case "print":
{
foreach (var item in @params)
{
Console.WriteLine(item);
}
}
break;
}
var message = $"Unknown function '{node}', check function name or count of parameters";
throw new Exception(message);
}
public static Object Eval(ExpressionNode node, IDataResolver dataResolver)
{
var operatorNode = (OperatorNode)node;
if (String.Equals(node.Action, "||"))
{
var leftFlag = Convert.ToBoolean(ExpressionEvaluator.Eval(operatorNode.Left, dataResolver));
if (leftFlag)
{
return(true);
}
return(Convert.ToBoolean(ExpressionEvaluator.Eval(operatorNode.Right, dataResolver)));
}
if (String.Equals(node.Action, "&&"))
{
var leftFlag = Convert.ToBoolean(ExpressionEvaluator.Eval(operatorNode.Left, dataResolver));
if (!leftFlag)
{
return(false);
}
return(Convert.ToBoolean(ExpressionEvaluator.Eval(operatorNode.Right, dataResolver)));
}
var leftNode = operatorNode.Left;
var rightNode = operatorNode.Right;
var leftValue = ExpressionEvaluator.Eval(leftNode, dataResolver);
var rightValue = ExpressionEvaluator.Eval(rightNode, dataResolver);
switch (node.Action.ToLower())
{
case "!":
return(!Convert.ToBoolean(rightValue));
case "+":
{
if (leftNode == null)
{
return(+ExpressionHelper.GetNumber(rightValue));
}
if (ExpressionHelper.IsDateTimeNode(leftNode, leftValue) || ExpressionHelper.IsDateTimeNode(rightNode, rightValue))
{
var leftDate = ExpressionHelper.GetDateTime(leftValue);
var rightDate = ExpressionHelper.GetDateTime(rightValue);
return(leftDate.AddTicks(rightDate.Ticks));
}
return(ExpressionHelper.GetNumber(leftValue) + ExpressionHelper.GetNumber(rightValue));
}
case "++":
return(ExpressionHelper.GetNumber(rightValue) + 1D);
case "-":
{
if (leftNode == null)
{
return(-ExpressionHelper.GetNumber(rightValue));
}
if (ExpressionHelper.IsDateTimeNode(leftNode, leftValue) || ExpressionHelper.IsDateTimeNode(rightNode, rightValue))
{
var leftDate = ExpressionHelper.GetDateTime(leftValue);
var rightDate = ExpressionHelper.GetDateTime(rightValue);
var ticksDiff = Math.Abs(leftDate.Ticks - rightDate.Ticks);
return(new DateTime(ticksDiff));
}
return(ExpressionHelper.GetNumber(leftValue) - ExpressionHelper.GetNumber(rightValue));
}
case "--":
return(ExpressionHelper.GetNumber(rightValue) - 1D);
case "=":
{
var name = leftNode.Action;
dataResolver.SetValue(name, rightValue);
return(rightValue);
}
case "==":
return(ExpressionHelper.Compare(leftNode, leftValue, rightNode, rightValue) == 0);
case "!=":
case "<>":
return(ExpressionHelper.Compare(leftNode, leftValue, rightNode, rightValue) != 0);
case "<=":
return(ExpressionHelper.Compare(leftNode, leftValue, rightNode, rightValue) <= 0);
case ">=":
return(ExpressionHelper.Compare(leftNode, leftValue, rightNode, rightValue) >= 0);
case "&&":
return(Convert.ToBoolean(leftValue) && Convert.ToBoolean(rightValue));
case "||":
return(Convert.ToBoolean(leftValue) || Convert.ToBoolean(rightValue));
case "^":
{
var a = ExpressionHelper.GetNumber(leftValue);
var b = ExpressionHelper.GetNumber(rightValue);
return(Math.Pow(a, b));
}
case "&":
return(String.Concat(leftValue, rightValue));
case "|":
return(ExpressionHelper.GetNumber(leftValue) % ExpressionHelper.GetNumber(rightValue));
case "%":
return(ExpressionHelper.GetNumber(leftValue) / 100D * ExpressionHelper.GetNumber(rightValue));
case "*":
return(ExpressionHelper.GetNumber(leftValue) * ExpressionHelper.GetNumber(rightValue));
case "/":
case "\\":
return(ExpressionHelper.GetNumber(leftValue) / ExpressionHelper.GetNumber(rightValue));
case "<":
return(ExpressionHelper.Compare(leftNode, leftValue, rightNode, rightValue) < 0);
case ">":
return(ExpressionHelper.Compare(leftNode, leftValue, rightNode, rightValue) > 0);
}
var message = $"Unknown operator '{node.Action}'";
throw new Exception(message);
}