private void TestUnary(UnaryOperationKind kind)
{
string text;
if (Operation.IsPrefixOperation(kind))
{
text = Operation.GetText(kind) + "$a";
}
else
{
text = "$a" + Operation.GetText(kind);
}
var expr = NSScript.ParseExpression(text) as UnaryExpression;
Assert.NotNull(expr);
Assert.Equal(SyntaxNodeKind.UnaryExpression, expr.Kind);
Assert.Equal(kind, expr.OperationKind);
var operand = expr.Operand as Variable;
Assert.NotNull(operand);
Assert.Equal("$a", operand.Name.FullName);
Assert.Equal(text, expr.ToString());
}
public BoundIncDecEx(BoundReferenceExpression target, UnaryOperationKind kind)
: base(target, new BoundLiteral(1L).WithAccess(BoundAccess.Read), Operations.IncDec)
{
Debug.Assert(
kind == UnaryOperationKind.OperatorPostfixDecrement ||
kind == UnaryOperationKind.OperatorPostfixIncrement ||
kind == UnaryOperationKind.OperatorPrefixDecrement ||
kind == UnaryOperationKind.OperatorPrefixIncrement);
this.IncrementKind = kind;
}
public static bool IsPrefixOperation(UnaryOperationKind unaryOperationKind)
{
switch (unaryOperationKind)
{
case UnaryOperationKind.LogicalNegation:
case UnaryOperationKind.UnaryPlus:
case UnaryOperationKind.UnaryMinus:
return(true);
default:
return(false);
}
}
private ConstantValue ApplyUnaryOperation(Expression operand, UnaryOperationKind operationKind)
{
if (operationKind == UnaryOperationKind.LogicalNegation)
{
return(!Evaluate(operand));
}
if (operand.Kind != SyntaxNodeKind.Variable &&
(operationKind == UnaryOperationKind.PostfixIncrement || operationKind == UnaryOperationKind.PostfixIncrement))
{
string op = Operation.GetText(operationKind);
throw new InvalidOperationException($"Unary operator '{op}' can only be applied to variables.");
}
ConstantValue oldValue;
string variableName = string.Empty;
if (operand.Kind == SyntaxNodeKind.Variable)
{
variableName = (operand as Variable).Name.FullName;
oldValue = _env?.GetVariable((operand as Variable).Name.FullName);
}
else
{
oldValue = Evaluate(operand);
}
switch (operationKind)
{
case UnaryOperationKind.UnaryPlus:
return(oldValue);
case UnaryOperationKind.UnaryMinus:
return(-oldValue);
case UnaryOperationKind.PostfixIncrement:
_env.SetVariable(variableName, oldValue++);
return(oldValue);
case UnaryOperationKind.PostfixDecrement:
default:
_env.SetVariable(variableName, oldValue--);
return(oldValue);
}
}
public static string GetText(UnaryOperationKind unaryOperationKind)
{
switch (unaryOperationKind)
{
case UnaryOperationKind.LogicalNegation:
return("!");
case UnaryOperationKind.UnaryPlus:
return("+");
case UnaryOperationKind.UnaryMinus:
return("-");
case UnaryOperationKind.PostfixIncrement:
return("++");
case UnaryOperationKind.PostfixDecrement:
return("--");
default:
return(string.Empty);
}
}
public static UnaryOperandKind GetUnaryOperandKind(UnaryOperationKind kind)
{
return (UnaryOperandKind)((int)kind & UnaryAndBinaryOperationExtensions.UnaryOperandKindMask);
}
public static SimpleUnaryOperationKind GetSimpleUnaryOperationKind(UnaryOperationKind kind)
{
return (SimpleUnaryOperationKind)((int)kind & UnaryAndBinaryOperationExtensions.SimpleUnaryOperationKindMask);
}
public static UnaryExpression Unary(Expression operand, UnaryOperationKind operationKind) => new UnaryExpression(operand, operationKind);
internal UnaryExpression(Expression operand, UnaryOperationKind operationKind)
{
Operand = operand;
OperationKind = operationKind;
}
internal static BinaryOperationKind DeriveBinaryOperationKind(UnaryOperationKind incrementKind)
{
switch (incrementKind)
{
case UnaryOperationKind.OperatorPostfixIncrement:
case UnaryOperationKind.OperatorPrefixIncrement:
return BinaryOperationKind.OperatorAdd;
case UnaryOperationKind.OperatorPostfixDecrement:
case UnaryOperationKind.OperatorPrefixDecrement:
return BinaryOperationKind.OperatorSubtract;
case UnaryOperationKind.IntegerPostfixIncrement:
case UnaryOperationKind.IntegerPrefixIncrement:
return BinaryOperationKind.IntegerAdd;
case UnaryOperationKind.IntegerPostfixDecrement:
case UnaryOperationKind.IntegerPrefixDecrement:
return BinaryOperationKind.IntegerSubtract;
case UnaryOperationKind.UnsignedPostfixIncrement:
case UnaryOperationKind.UnsignedPrefixIncrement:
return BinaryOperationKind.UnsignedAdd;
case UnaryOperationKind.UnsignedPostfixDecrement:
case UnaryOperationKind.UnsignedPrefixDecrement:
return BinaryOperationKind.UnsignedSubtract;
case UnaryOperationKind.FloatingPostfixIncrement:
case UnaryOperationKind.FloatingPrefixIncrement:
return BinaryOperationKind.FloatingAdd;
case UnaryOperationKind.FloatingPostfixDecrement:
case UnaryOperationKind.FloatingPrefixDecrement:
return BinaryOperationKind.FloatingSubtract;
case UnaryOperationKind.DecimalPostfixIncrement:
case UnaryOperationKind.DecimalPrefixIncrement:
return BinaryOperationKind.DecimalAdd;
case UnaryOperationKind.DecimalPostfixDecrement:
case UnaryOperationKind.DecimalPrefixDecrement:
return BinaryOperationKind.DecimalSubtract;
case UnaryOperationKind.EnumPostfixIncrement:
case UnaryOperationKind.EnumPrefixIncrement:
return BinaryOperationKind.EnumAdd;
case UnaryOperationKind.EnumPostfixDecrement:
case UnaryOperationKind.EnumPrefixDecrement:
return BinaryOperationKind.EnumSubtract;
case UnaryOperationKind.PointerPostfixIncrement:
case UnaryOperationKind.PointerPrefixIncrement:
return BinaryOperationKind.PointerIntegerAdd;
case UnaryOperationKind.PointerPostfixDecrement:
case UnaryOperationKind.PointerPrefixDecrement:
return BinaryOperationKind.PointerIntegerSubtract;
case UnaryOperationKind.DynamicPostfixIncrement:
case UnaryOperationKind.DynamicPrefixIncrement:
return BinaryOperationKind.DynamicAdd;
case UnaryOperationKind.DynamicPostfixDecrement:
case UnaryOperationKind.DynamicPrefixDecrement:
return BinaryOperationKind.DynamicSubtract;
default:
throw ExceptionUtilities.UnexpectedValue(incrementKind);
}
}
public static UnaryOperandKind GetUnaryOperandKind(UnaryOperationKind kind)
{
return((UnaryOperandKind)((int)kind & UnaryAndBinaryOperationExtensions.UnaryOperandKindMask));
}
public static SimpleUnaryOperationKind GetSimpleUnaryOperationKind(UnaryOperationKind kind)
{
return((SimpleUnaryOperationKind)((int)kind & UnaryAndBinaryOperationExtensions.SimpleUnaryOperationKindMask));
}
public static bool IsPostfixOperation(UnaryOperationKind unaryOperationKind) => !IsPrefixOperation(unaryOperationKind);
private static Precedence GetOperationPrecedence(UnaryOperationKind operationKind) => Precedence.Unary;