/// <summary>
/// Executes sub-expressions and checks resulting <see cref="Value"/>s for equality.
/// </summary>
/// <param name="vm">The environment in which to execute the operation.</param>
/// <returns>A <see cref="BooleanValue"/>. True if equal. False if not.</returns>
public override Value Execute(VM vm)
{
Value a = Lhs.Execute(vm);
Value b = Rhs.Execute(vm);
bool equal = a.Equal(b);
return(new BooleanValue(equal));
}
/// <inheritdoc />
protected override object ExecuteToken(ScriptContext context)
{
try {
object lhs = Lhs.Execute(context);
object rhs = Rhs.Execute(context);
TypeInformation.ConvertOperands(ref lhs, ref rhs);
return(Operate(lhs, rhs, context));
}
catch (RuntimeBinderException e) {
throw new ScriptRuntimeException(e.Message, null, e);
}
}
/// <summary>
/// Returns the <see cref="Value"/> in the list gotten by Lhs at the index gotten by Rhs.
/// </summary>
/// <param name="vm">The environment in which to execute the operation.</param>
/// <returns>The element in the list.</returns>
/// <exception cref="Exception">If there was a type error.</exception>
public override Value Execute(VM vm)
{
Value list = Lhs.Execute(vm);
Value idx = Rhs.Execute(vm);
Value.AssertType(Value.ValueType.List, list,
"First operand to '[]' expected to be 'List' but was given '{0}'.", list.Type);
Value.AssertType(Value.ValueType.Number, idx,
"Second operand to '[]' expected to be 'Number' but was given '{0}'.", idx.Type);
List <Value> values = list.List;
float i = idx.Number;
return(values[(int)i]);
}
/// <summary>
/// Evaluates Lhs > Rhs and returns the result.
/// </summary>
/// <param name="vm">The environment in which to execute the operation.</param>
/// <returns>A <see cref="BooleanValue"/>. True if Lhs > Rhs. False if not.</returns>
/// <exception cref="Exception">If either sub-expression doesn't return a <see cref="NumberValue"/>.</exception>
public override Value Execute(VM vm)
{
Value a = Lhs.Execute(vm);
Value b = Rhs.Execute(vm);
Value.AssertType(Value.ValueType.Number, a,
"First operand of '>' expected to be 'Number' but was given '{0}'.", a.Type);
Value.AssertType(Value.ValueType.Number, b,
"Second operand of '>' expected to be 'Number' but was given '{0}'.", b.Type);
float numA = a.Number;
float numB = b.Number;
return(new BooleanValue(numA > numB));
}
/// <summary>
/// Executes sub-expressions and returns the sum of the resulting <see cref="NumberValue"/>s.
/// </summary>
/// <param name="vm">The environment in which to execute the operation.</param>
/// <returns>A <see cref="NumberValue"/>. The sum of the sub-expressions.</returns>
/// <exception cref="Exception">If either sub-expression doesn't return a <see cref="NumberValue"/>.</exception>
public override Value Execute(VM vm)
{
Value a = Lhs.Execute(vm);
Value b = Rhs.Execute(vm);
Value.AssertType(Value.ValueType.Number, a,
"First argument to '+' expected to be 'Number' but was given '{0}'.", a.Type);
Value.AssertType(Value.ValueType.Number, b,
"Second argument to '+' expected to be 'Number' but was given '{0}'.", b.Type);
float numA = a.Number;
float numB = b.Number;
float numR = numA + numB;
return(new NumberValue(numR));
}
/// <summary>
/// Evaluates Lhs and Rhs with short-circuiting.
/// </summary>
/// <param name="vm">The environment in which to execute the operation.</param>
/// <returns>A <see cref="BooleanValue"/>. True if both sub-expression are true. False if not.</returns>
/// <exception cref="Exception">if either sub-expression doesn't return a <see cref="BooleanValue"/>.</exception>
public override Value Execute(VM vm)
{
Value a = Lhs.Execute(vm);
Value.AssertType(Value.ValueType.Boolean, a,
"First operand of 'or' expected to be 'Boolean' but was given '{0}'.", a.Type);
bool boolA = a.Boolean;
if (!boolA)
{
return(new BooleanValue(boolA));
}
Value b = Rhs.Execute(vm);
Value.AssertType(Value.ValueType.Boolean, b,
"Second operand of 'or' expected to be 'Boolean' but was given '{0}'.", b.Type);
return(new BooleanValue(b.Boolean));
}
/// <summary>
/// Executes sub-expressions and returns a <see cref="RangeValue"/>.
/// </summary>
/// <param name="vm">The environment in which to execute the sub-expressions.</param>
/// <returns>A <see cref="RangeValue"/>. A range between Lhs and Rhs.</returns>
/// <exception cref="Exception">If type error.</exception>
public override Value Execute(VM vm)
{
Value start = Lhs.Execute(vm);
Value end = Rhs.Execute(vm);
if (!Value.TypesMatch(start, end))
{
throw new Exception("start and end values of 'Range' must be the same type.");
}
if (start.Type != Value.ValueType.Number && start.Type != Value.ValueType.Char)
{
throw new Exception(string.Format("Cannot make a range over '{0}'.", start.Type));
}
if (end.Type != Value.ValueType.Number && end.Type != Value.ValueType.Char)
{
throw new Exception(string.Format("Cannot make a range over '{0}'.", end.Type));
}
return(new RangeValue(start, end, inclusive));
}
/// <inheritdoc />
protected override object Operate(ScriptContext context)
{
return(Lhs.Execute(context).ToBoolean() != Rhs.Execute(context).ToBoolean());
}
/// <inheritdoc />
protected override object Compute(ScriptContext context)
{
return((dynamic)Lhs.Execute(context) & (dynamic)Rhs.Execute(context));
}