public static bool ParseAndEvaluate(string condition, IExpressionContext context)
{
if (String.IsNullOrEmpty(condition))
{
return(true);
}
try {
ConditionExpression ce = ParseCondition(condition);
if (!ce.TryEvaluateToBool(context, out bool result))
{
throw new InvalidProjectFileException(String.Format("Can not evaluate \"{0}\" to bool.", condition));
}
return(result);
} 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 TryEvaluateToBool(IExpressionContext context, out bool result)
{
var canEvaluate = expression.TryEvaluateToBool(context, out result);
result = !result;
return(canEvaluate);
}
public override bool TryEvaluateToBool(IExpressionContext context, out bool result)
{
// Short-circuiting, check only left expr, right
// would be required only if left == true
if (!left.TryEvaluateToBool(context, out result))
{
return(false);
}
if (!result)
{
return(true);
}
return(right.TryEvaluateToBool(context, out result));
}
public override bool TryEvaluateToBool(IExpressionContext context, out bool result)
{
if (left.TryEvaluateToBool(context, out bool l) && right.TryEvaluateToBool(context, out bool r))
{
result = BoolCompare(l, r, op);
return(true);
}
if (left.TryEvaluateToVersion(context, out Version vl))
{
if (right.TryEvaluateToVersion(context, out Version vr))
{
result = VersionCompare(vl, vr, op);
return(true);
}
else if (right.TryEvaluateToNumber(context, out float fr))
{
result = VersionCompare(vl, fr, op);
return(true);
}
}
else if (left.TryEvaluateToNumber(context, out float fl))
{
if (right.TryEvaluateToNumber(context, out float fr))
{
result = NumberCompare(fl, fr, op);
return(true);
}
else if (right.TryEvaluateToVersion(context, out Version vr))
{
result = VersionCompare(fl, vr, op);
return(true);
}
}
if (!left.TryEvaluateToString(context, out string ls) || !right.TryEvaluateToString(context, out string rs))
{
result = false;
return(false);
}
result = StringCompare(ls, rs, op);
return(true);
}
public override bool TryEvaluateToBool(IExpressionContext context, out bool result)
{
if (left.TryEvaluateToBool(context, out bool l) && right.TryEvaluateToBool(context, out bool r))
{
result = BoolCompare(l, r, op);
return(true);
}
if (left.TryEvaluateToVersion(context, out Version vl))
{
if (right.TryEvaluateToVersion(context, out Version vr))
{
result = VersionCompare(vl, vr, op);
return(true);
}
else if (right.TryEvaluateToNumber(context, out float fr))
{
result = VersionCompare(vl, fr, op);
return(true);
}
}
else if (left.TryEvaluateToNumber(context, out float fl))
{
if (right.TryEvaluateToNumber(context, out float fr))
{
result = NumberCompare(fl, fr, op);
return(true);
}
else if (right.TryEvaluateToVersion(context, out Version vr))
{
result = VersionCompare(fl, vr, op);
return(true);
}
}
if (!left.TryEvaluateToString(context, out string ls) || !right.TryEvaluateToString(context, out string rs))
{
result = false;
return(false);
}
// Special case MSBuildToolsVersion when it is set to Current.
if (op != RelationOperator.Equal || op != RelationOperator.NotEqual)
{
if (IsMSBuildCurrentToolsVersion(left, ls))
{
if (TryGetVisualStudioVersion(context, out vl))
{
if (right.TryEvaluateToVersion(context, out Version vr))
{
result = VersionCompare(vl, vr, op);
return(true);
}
else if (right.TryEvaluateToNumber(context, out float fr))
{
result = VersionCompare(vl, fr, op);
return(true);
}
}
}
else if (IsMSBuildCurrentToolsVersion(right, rs))
{
if (TryGetVisualStudioVersion(context, out Version vr))
{
if (left.TryEvaluateToVersion(context, out vl))
{
result = VersionCompare(vl, vr, op);
return(true);
}
else if (left.TryEvaluateToNumber(context, out float fl))
{
result = VersionCompare(fl, vr, op);
return(true);
}
}
}
}
result = StringCompare(ls, rs, op);
return(true);
}