public static bool ParseAndEvaluate(string condition, IExpressionContext context)
{
if (String.IsNullOrEmpty(condition))
{
return(true);
}
try {
ConditionExpression ce = ParseCondition(condition);
if (!ce.CanEvaluateToBool(context))
{
throw new InvalidProjectFileException(String.Format("Can not evaluate \"{0}\" to bool.", condition));
}
return(ce.BoolEvaluate(context));
} catch (ExpressionParseException epe) {
throw new InvalidProjectFileException(
String.Format("Unable to parse condition \"{0}\" : {1}", condition, epe.Message),
epe);
} catch (ExpressionEvaluationException epe) {
throw new InvalidProjectFileException(
String.Format("Unable to evaluate condition \"{0}\" : {1}", condition, epe.Message),
epe);
}
}
public override bool BoolEvaluate(IExpressionContext context)
{
if (left.CanEvaluateToNumber(context) && right.CanEvaluateToNumber(context))
{
float l, r;
l = left.NumberEvaluate(context);
r = right.NumberEvaluate(context);
return(NumberCompare(l, r, op));
}
else if (left.CanEvaluateToBool(context) && right.CanEvaluateToBool(context))
{
bool l, r;
l = left.BoolEvaluate(context);
r = right.BoolEvaluate(context);
return(BoolCompare(l, r, op));
}
else
{
string l, r;
l = left.StringEvaluate(context);
r = right.StringEvaluate(context);
return(StringCompare(l, r, op));
}
}
public override bool CanEvaluateToBool(IExpressionContext context)
{
return(expression.CanEvaluateToBool(context));
}
public override bool CanEvaluateToBool(IExpressionContext context)
{
// Short-circuiting, check only left expr, right
// would be required only if left == true
return(left.CanEvaluateToBool(context));
}