object IScriptCustomType.EvaluateUnaryExpression(ScriptUnaryExpression expression)
{
switch (expression.Operator)
{
case ScriptUnaryOperator.Negate:
return((ScriptTimeSpan)value.Negate());
case ScriptUnaryOperator.Not:
return(value == TimeSpan.Zero);
default:
throw new ScriptRuntimeException(expression.Span, $"Operator [{expression.Operator}] is not supported for timespan");
}
}
private ScriptIfStatement ParseIfStatement(bool invert, ScriptKeyword elseKeyword = null)
{
// unit test: 200-if-else-statement.txt
var ifStatement = Open <ScriptIfStatement>();
ifStatement.ElseKeyword = elseKeyword;
if (_isLiquid && elseKeyword != null)
{
// Parse elseif
Open(ifStatement.IfKeyword);
NextToken();
Close(ifStatement.IfKeyword);
}
else
{
if (_isLiquid && invert) // we have an unless
{
Open(ifStatement.IfKeyword); // still transfer trivias to IfKeyword
NextToken();
Close(ifStatement.IfKeyword);
}
else
{
ExpectAndParseKeywordTo(ifStatement.IfKeyword); // Parse if keyword
}
}
var condition = ExpectAndParseExpression(ifStatement, allowAssignment: false);
// Transform a `if condition` to `if !(condition)`
if (invert)
{
var invertCondition = ScriptUnaryExpression.Wrap(ScriptUnaryOperator.Not, ScriptToken.Exclamation(), ScriptNestedExpression.Wrap(condition, _isKeepTrivia), _isKeepTrivia);
condition = invertCondition;
}
ifStatement.Condition = condition;
if (ExpectEndOfStatement())
{
ifStatement.Then = ParseBlockStatement(ifStatement);
}
return(Close(ifStatement));
}
private ScriptExpression ParseUnaryExpression(ref bool hasAnonymousFunction)
{
// unit test: 113-unary.txt
ScriptUnaryExpression unaryExpression = Open <ScriptUnaryExpression>();
switch (Current.Type)
{
case TokenType.Not:
unaryExpression.Operator = ScriptUnaryOperator.Not;
break;
case TokenType.Minus:
unaryExpression.Operator = ScriptUnaryOperator.Negate;
break;
case TokenType.Plus:
unaryExpression.Operator = ScriptUnaryOperator.Plus;
break;
case TokenType.Arroba:
unaryExpression.Operator = ScriptUnaryOperator.FunctionAlias;
break;
case TokenType.Caret:
unaryExpression.Operator = ScriptUnaryOperator.FunctionParametersExpand;
break;
default:
LogError(string.Format(RS.UnexpectedTokenInUnaryExpr, Current.Type));
break;
}
int newPrecedence = GetOperatorPrecedence(unaryExpression.Operator);
NextToken();
// unit test: 115-unary-error1.txt
unaryExpression.Right = ExpectAndParseExpression(unaryExpression, ref hasAnonymousFunction, null, newPrecedence);
return(Close(unaryExpression));
}
object IScriptCustomType.EvaluateUnaryExpression(ScriptUnaryExpression expression)
{
throw new ScriptRuntimeException(expression.Span, $"Operator [{expression.Operator}] is not supported for date");
}
public bool TryEvaluate(TemplateContext context, SourceSpan span, ScriptUnaryOperator op, object rightValue, out object result)
{
result = ScriptUnaryExpression.Evaluate(context, span, op, (float)(KalkHalf)rightValue);
return(true);
}
