public void ExecuteTest2()
{
var functions = new FunctionCollection();
var func = new UserFunction("f", new IExpression[] { new Number(1) });
Assert.Throws <KeyNotFoundException>(() => func.Execute(functions));
}
private int CompareFunc(UserFunction userFunction, List <Variable> paramList)
{
var outVar = userFunction.Execute(paramList, null, null);
if (outVar)
{
return(-1);
}
return(1);
}
public void ExecuteTest1()
{
var functions = new FunctionCollection();
functions.Add(new UserFunction("f", new IExpression[] { Variable.X }), new Ln(Variable.X));
var func = new UserFunction("f", new IExpression[] { new Number(1) });
Assert.Equal(Math.Log(1), func.Execute(functions));
}
public void ExecuteTest3()
{
var uf1 = new UserFunction("func", new[] { Variable.X }, 1);
var func = new DelegateExpression(p => (double)p.Variables["x"] == 10 ? 0 : 1);
var funcs = new FunctionCollection
{
{ uf1, func }
};
var uf2 = new UserFunction("func", new[] { new Number(12) }, 1);
var result = uf2.Execute(new ExpressionParameters(funcs));
Assert.Equal(1, result);
}
public void ExecuteRecursiveTest()
{
var expParams = new ExpressionParameters();
var exp = new If(new Equal(Variable.X, new Number(0)),
new Number(1),
new Mul(Variable.X, new UserFunction("f", new[] { new Sub(Variable.X, new Number(1)) })));
expParams.Functions.Add(new UserFunction("f", new[] { Variable.X }), exp);
var func = new UserFunction("f", new[] { new Number(4) });
Assert.Equal(24.0, func.Execute(expParams));
}
public void ExecuteNullTest()
{
var exp = new UserFunction("f", new IExpression[0]);
Assert.Throws <ArgumentNullException>(() => exp.Execute(null));
}
/// <summary>
/// Executes an expression.
/// </summary>
public SkryptObject ExecuteExpression(Node node, ScopeContext scopeContext)
{
_engine.CurrentNode = node;
var op = Operator.AllOperators.Find(o => o.OperationName == node.Body);
if (op != null)
{
// Do return operation.
if (op.OperationName == "return")
{
if ((scopeContext.Properties & ScopeProperties.InMethod) == 0)
{
_engine.ThrowError("Can't use return operator outside method", node.Token);
}
// Return null if no value was given.
SkryptObject result = node.Nodes.Count == 1
? ExecuteExpression(node.Nodes[0], scopeContext)
: new Library.Native.System.Null();
scopeContext.ReturnObject = result;
return(null);
}
// Do break operation.
if (op.OperationName == "break")
{
if ((scopeContext.Properties & ScopeProperties.InLoop) == 0)
{
_engine.ThrowError("Can't use break operator outside loop", node.Token);
}
scopeContext.Properties |= ScopeProperties.BrokeLoop;
return(null);
}
// Do continue operation.
if (op.OperationName == "continue")
{
if ((scopeContext.Properties & ScopeProperties.InLoop) == 0)
{
_engine.ThrowError("Can't use continue operator outside loop", node.Token);
}
scopeContext.Properties |= ScopeProperties.SkippedLoop;
return(null);
}
// Do access operation.
if (op.OperationName == "access")
{
var target = ExecuteExpression(node.Nodes[0], scopeContext);
var result = ExecuteAccess(target, node.Nodes[1], scopeContext);
scopeContext.Caller = result.Owner;
// Execute result as method if its a getter property.
if (result.Property.Value.GetType() == typeof(GetMethod))
{
var ex = ((GetMethod)result.Property.Value).Execute(_engine, result.Owner, new SkryptObject[0], new ScopeContext {
ParentScope = scopeContext
});
return(ex.ReturnObject);
}
else
{
return(result.Property.Value);
}
}
// Do assignment operation.
if (op.OperationName == "assign")
{
// Solve right side.
var result = ExecuteExpression(node.Nodes[1], scopeContext);
// Copy value of results like numbers, string etc, so variables that
// are assigned to eachother don't edit eachothers values.
if (typeof(SkryptType).IsAssignableFrom(result.GetType()))
{
if (((SkryptType)result).CreateCopyOnAssignment)
{
result = result.Clone();
}
}
// Left side is an identifier.
if (node.Nodes[0].Nodes.Count == 0 && node.Nodes[0].Type == TokenTypes.Identifier)
{
if (GeneralParser.Keywords.Contains(node.Nodes[0].Body))
{
_engine.ThrowError("Setting variable names to keywords is disallowed");
}
var variable = GetVariable(node.Nodes[0].Body, scopeContext);
if (variable != null && !scopeContext.StrictlyLocal)
{
if ((variable.Modifiers & Modifier.Const) != 0)
{
_engine.ThrowError("Variable is marked as constant and can thus not be modified.", node.Nodes[0].Token);
}
if ((variable.Modifiers & Modifier.Strong) != 0)
{
if (variable.Value.Name != result.Name)
{
_engine.ThrowError($"Can't set strong variable of type {variable.Value.Name} to {result.Name}", node.Nodes[0].Token);
}
}
variable.Value = result;
}
else
{
scopeContext.SetVariable(node.Nodes[0].Body, result, node.Modifiers);
}
}
// Left side is an expression.
else if (node.Nodes[0].Body == "access")
{
var target = ExecuteExpression(node.Nodes[0].Nodes[0], scopeContext);
var accessResult = ExecuteAccess(target, node.Nodes[0].Nodes[1], scopeContext, true);
if ((accessResult.Property.Modifiers & Modifier.Const) != 0)
{
_engine.ThrowError("Property is marked as constant and can thus not be modified.", node.Nodes[0].Nodes[1].Token);
}
if ((accessResult.Property.Modifiers & Modifier.Strong) != 0)
{
if (accessResult.Property.Value.Name != result.Name)
{
_engine.ThrowError($"Can't set strong property of type {accessResult.Property.Value.Name} to {result.Name}", node.Nodes[0].Nodes[1].Token);
}
}
if (accessResult.Property.IsSetter)
{
((SetMethod)accessResult.Property.Value).Execute(_engine, target, result, new ScopeContext {
ParentScope = scopeContext
});
}
else
{
accessResult.Property.Value = result;
}
//SetFunctionOwner(result, target);
}
// Left side is an expression.
else if (node.Nodes[0].Body == "Index")
{
ExecuteIndexSet(result, (IndexNode)node.Nodes[0], scopeContext);
}
else
{
_engine.ThrowError("Left hand side needs to be a variable or property!", node.Nodes[0].Token);
}
return(result);
}
// Evaluate node as binary expression.
if (op.Members == 2)
{
var leftResult = ExecuteExpression(node.Nodes[0], scopeContext);
var rightResult = ExecuteExpression(node.Nodes[1], scopeContext);
return(_engine.Eval(op, leftResult, rightResult, node));
}
// Evaluate node as unary expression.
if (op.Members == 1)
{
var leftResult = ExecuteExpression(node.Nodes[0], scopeContext);
return(_engine.Eval(op, leftResult, node));;
}
}
// Create array literal instance.
else if (node.Type == TokenTypes.ArrayLiteral)
{
var arrayNode = (ArrayNode)node;
var array = _engine.Create <Library.Native.System.Array>();
// Solve all expressions within the array and add the resulting values.
for (var i = 0; i < arrayNode.Values.Count; i++)
{
var subNode = arrayNode.Values[i];
var result = ExecuteExpression(subNode, scopeContext);
array.List.Add(result);
}
return(array);
}
// Create function literal instance.
else if (node.Type == TokenTypes.FunctionLiteral)
{
var result = new UserFunction {
Name = "method",
Signature = node.Body,
BlockNode = node.Nodes[0],
CallName = node.Body.Split('_')[0],
Path = _engine.CurrentExecutingFile
};
foreach (var snode in node.Nodes[1].Nodes)
{
result.Parameters.Add(snode.Body);
}
return(result);
}
else if (node.Type == TokenTypes.Conditional)
{
var conditionNode = (ConditionalNode)node;
var conditionBool = ExecuteExpression(conditionNode.Condition, scopeContext);
if (conditionBool.ToBoolean())
{
return(ExecuteExpression(conditionNode.Pass, scopeContext));
}
else
{
return(ExecuteExpression(conditionNode.Fail, scopeContext));
}
}
else
{
switch (node.Type)
{
case TokenTypes.NumericLiteral:
return(_engine.Create <Library.Native.System.Numeric>(((NumericNode)node).Value));
case TokenTypes.StringLiteral:
return(_engine.Create <Library.Native.System.String>(((StringNode)node).Value));
case TokenTypes.BooleanLiteral:
return(_engine.Create <Library.Native.System.Boolean>(((BooleanNode)node).Value));
case TokenTypes.NullLiteral:
return(_engine.Create <Library.Native.System.Null>());
}
}
// Get variable
if (node.Type == TokenTypes.Identifier)
{
var foundVariable = GetVariable(node.Body, scopeContext);
if (foundVariable != null)
{
return(foundVariable.Value);
}
_engine.ThrowError("Variable '" + node.Body + "' does not exist in the current context!", node.Token);
}
// Do index operation
if (node.Type == TokenTypes.Index)
{
return(ExecuteIndex((IndexNode)node, scopeContext));
}
// Do function call operation.
if (node.Type == TokenTypes.Call)
{
var callNode = (CallNode)node;
var arguments = new List <SkryptObject>();
// Solve argument expressions.
foreach (var subNode in callNode.Arguments)
{
var result = ExecuteExpression(subNode, scopeContext);
arguments.Add(result);
}
// Get the value that's being called.
var foundFunction = ExecuteExpression(callNode.Getter, scopeContext);
var caller = scopeContext.Caller;
SkryptObject BaseType = null;
bool isConstructor = false;
bool validConstructor = true;
// Check if we're creating a new instance of a type.
if (!typeof(SkryptMethod).IsAssignableFrom(foundFunction.GetType()))
{
var find = foundFunction.GetProperty("Constructor");
var typeName = foundFunction.GetProperty("TypeName").ToString();
validConstructor = foundFunction.GetType() == typeof(SkryptObject);
foundFunction = find ?? new SkryptMethod {
Name = "Constructor"
};
BaseType = GetType(typeName, scopeContext);
// Create new instance of type and set that as the caller.
caller = (SkryptType)Activator.CreateInstance(BaseType.GetType());
caller.ScopeContext = _engine.CurrentScope;
caller.Engine = _engine;
caller.Name = typeName;
caller.GetPropertiesFrom(BaseType);
isConstructor = true;
}
// Create new scope to use within the function.
var methodContext = new ScopeContext {
ParentScope = scopeContext,
// Create new call stack for method.
CallStack = new CallStack(((SkryptMethod)foundFunction).Name, callNode.Getter.Token, scopeContext.CallStack, ""),
Properties = scopeContext.Properties | ScopeProperties.InMethod
};
_engine.CurrentStack = methodContext.CallStack;
ScopeContext methodScopeResult = null;
// Function is defined in Skrypt.
if (foundFunction.GetType() == typeof(UserFunction))
{
UserFunction function = (UserFunction)foundFunction;
// Create variables for each parameter based on the given arguments.
for (var i = 0; i < function.Parameters.Count; i++)
{
var parName = function.Parameters[i];
SkryptObject input;
// Set to null if there's no argument.
input = i < arguments.Count ? arguments[i] : new Library.Native.System.Null();
methodContext.Variables[parName] = new Variable {
Name = parName,
Value = input,
Scope = methodContext
};
}
methodContext.CallStack.Path = _engine.CurrentExecutingFile;
_engine.CurrentExecutingFile = function.Path;
methodScopeResult = function.Execute(_engine, caller, arguments.ToArray(), methodContext);
}
// Function is defined in C#.
else if (foundFunction.GetType() == typeof(SharpMethod))
{
methodScopeResult = ((SharpMethod)foundFunction).Execute(_engine, caller, arguments.ToArray(), methodContext);
}
else if (!validConstructor)
{
_engine.ThrowError("Cannot call value, as it is not a function!", callNode.Getter.Token);
}
if (isConstructor)
{
caller.ScopeContext = _engine.CurrentScope;
caller.Engine = _engine;
return(caller);
}
else
{
return(methodScopeResult.ReturnObject);
}
}
return(null);
}
/// <summary>
/// Allows you to invoke a function from the engine's global scope.
/// </summary>
public SkryptObject Invoke(string name, params object[] arguments)
{
var parameters = new SkryptObject[arguments.Length];
var foundMethod = GetVariable(name, _engine.GlobalScope).Value;
var input = new List <SkryptObject>();
var methodContext = new ScopeContext {
ParentScope = _engine.GlobalScope
};
for (int i = 0; i < arguments.Length; i++)
{
object arg = arguments[i];
if (arg.GetType() == typeof(int) || arg.GetType() == typeof(float) || arg.GetType() == typeof(double))
{
parameters[i] = new Library.Native.System.Numeric(Convert.ToDouble(arg));
}
else if (arg.GetType() == typeof(string))
{
parameters[i] = new Library.Native.System.String((string)arg);
}
else if (arg.GetType() == typeof(bool))
{
parameters[i] = new Library.Native.System.Boolean((bool)arg);
}
else if (arg == null)
{
parameters[i] = new Library.Native.System.Null();
}
parameters[i].GetPropertiesFrom(GetType(((SkryptType)parameters[i]).TypeName, _engine.GlobalScope));
input.Add(parameters[i]);
}
ScopeContext methodScopeResult = null;
if (foundMethod.GetType() == typeof(UserFunction))
{
UserFunction method = (UserFunction)foundMethod;
for (var i = 0; i < method.Parameters.Count; i++)
{
var parName = method.Parameters[i];
SkryptObject inp;
inp = i < input.Count ? input[i] : new Library.Native.System.Null();
methodContext.Variables[parName] = new Variable {
Name = parName,
Value = inp,
Scope = methodContext
};
}
methodScopeResult = method.Execute(_engine, null, input.ToArray(), methodContext);
}
else if (foundMethod.GetType() == typeof(SharpMethod))
{
methodScopeResult = ((SharpMethod)foundMethod).Execute(_engine, null, input.ToArray(), methodContext);
}
else
{
_engine.ThrowError("Cannot call value, as it is not a function!");
}
return(methodScopeResult.ReturnObject);
}