// public static JsExpression RemoveTopObservables(JsExpression expression)
// {
// foreach (var leaf in expression.GetLeafResultNodes())
// {
// JsExpression replacement = null;
// if (leaf is JsInvocationExpression invocation && invocation.Annotation<ObservableUnwrapInvocationAnnotation>() != null)
// {
// replacement = invocation.Target;
// }
// else if (leaf is JsMemberAccessExpression member && member.MemberName == "$data" && member.Target is JsSymbolicParameter par && par.Symbol == JavascriptTranslator.KnockoutContextParameter ||
// leaf is JsSymbolicParameter param && param.Symbol == JavascriptTranslator.KnockoutViewModelParameter)
// {
// replacement = new JsSymbolicParameter(KnockoutContextParameter).Member("$rawData")
// .WithAnnotation(leaf.Annotation<ViewModelInfoAnnotation>());
// }
// if (replacement != null)
// {
// if (leaf.Parent == null) expression = replacement;
// else leaf.ReplaceWith(replacement);
// }
// }
// return expression;
// }
public static (JsExpression context, JsExpression data) GetKnockoutContextParameters(int dataContextLevel)
{
JsExpression currentContext = new JsSymbolicParameter(KnockoutContextParameter);
for (int i = 0; i < dataContextLevel; i++)
{
currentContext = currentContext.Member("$parentContext");
}
var currentData = dataContextLevel == 0 ? new JsSymbolicParameter(KnockoutContextParameter).Member("$data") :
dataContextLevel == 1 ? new JsSymbolicParameter(KnockoutContextParameter).Member("$parent") :
new JsSymbolicParameter(KnockoutContextParameter).Member("$parents").Indexer(new JsLiteral(dataContextLevel - 1));
return(currentContext, currentData);
}
private void AssertFormatting(string expectedString, JsNode node)
{
Assert.AreEqual(expectedString, node.Clone().FormatScript());
foreach (var dd in node.Descendants.OfType <JsExpression>())
{
var symbol = new JsSymbolicParameter(new CodeSymbolicParameter());
dd.ReplaceWith(symbol);
var parametrized = node.Clone().FormatParametrizedScript();
var resolved = parametrized.ToString(o =>
o == symbol.Symbol ? CodeParameterAssignment.FromExpression(dd) :
throw new Exception());
Assert.AreEqual(expectedString, resolved, $"Replaced expression: {dd.FormatScript()}");
symbol.ReplaceWith(dd);
}
}
protected void ProcessTargetedExpression(JsExpression expression, JsExpression defaultValue)
{
var target = expression.GetChildByRole(JsTreeRoles.TargetExpression);
if (target.HasAnnotation <MayBeNullAnnotation>())
{
// A().B -> (A() || {}).B
if (defaultValue != null &&
(expression.HasAnnotation <MayBeNullAnnotation>() || expression.IsRootResultExpression()) &&
target.IsComplexType() &&
IntroduceVariableFor(target, 1))
{
target.ReplaceWith(_ =>
new JsBinaryExpression(target, BinaryOperatorType.ConditionalOr, defaultValue));
}
// {A().B}.MORESTUFF -> (a=A()) == null : null ? a.B.MORESTUFF
else
{
var dependentExpression = GetDependentAncestorNode(expression);
if (IntroduceVariableFor(target))
{
var variable = new JsSymbolicParameter(new JsTemporaryVariableParameter());
target.ReplaceWith(variable);
target = new JsAssignmentExpression(variable.Clone(), target);
}
else
{
target = target.Clone();
}
ReplaceOrEmit(dependentExpression, _ => {
return(CreateNullCondition(target, dependentExpression).WithAnnotation(MayBeNullAnnotation.Instance));
});
}
}
}
