public JsExpression CompileToJavascript(DataContextStack dataContext, Expression expression)
{
var currentContextVariable = new JsTemporaryVariableParameter(new JsIdentifierExpression("ko").Member("contextFor").Invoke(new JsSymbolicParameter(CommandBindingExpression.SenderElementParameter)));
var resultPromiseVariable = new JsTemporaryVariableParameter(new JsNewExpression("DotvvmPromise"));
var senderVariable = new JsTemporaryVariableParameter(new JsSymbolicParameter(CommandBindingExpression.SenderElementParameter));
var visitor = new ExtractExpressionVisitor(ex => ex.NodeType == ExpressionType.Call && ex is MethodCallExpression methodCall && javascriptTranslator.TryTranslateMethodCall(methodCall.Object, methodCall.Arguments.ToArray(), methodCall.Method, dataContext) == null);
var rootCallback = visitor.Visit(expression);
var js = SouldCompileCallback(rootCallback) ? new JsSymbolicParameter(resultPromiseVariable).Member("resolve").Invoke(javascriptTranslator.CompileToJavascript(rootCallback, dataContext)) : null;
foreach (var param in visitor.ParameterOrder.Reverse <ParameterExpression>())
{
js = js ?? new JsSymbolicParameter(resultPromiseVariable).Member("resolve").Invoke(new JsIdentifierExpression(param.Name));
var callback = new JsFunctionExpression(new[] { new JsIdentifier(param.Name) }, new JsBlockStatement(new JsExpressionStatement(js)));
var method = visitor.Replaced[param] as MethodCallExpression;
js = CompileMethodCall(method, dataContext, callback);
}
foreach (var sp in js.Descendants.OfType <JsSymbolicParameter>())
{
if (sp.Symbol == JavascriptTranslator.KnockoutContextParameter)
{
sp.Symbol = currentContextVariable;
}
else if (sp.Symbol == JavascriptTranslator.KnockoutViewModelParameter)
{
sp.ReplaceWith(new JsSymbolicParameter(currentContextVariable).Member("$data"));
}
else if (sp.Symbol == CommandBindingExpression.SenderElementParameter)
{
sp.Symbol = senderVariable;
}
}
return(new JsBinaryExpression(js, BinaryOperatorType.Sequence, new JsSymbolicParameter(resultPromiseVariable)));
}
public JsExpression CompileToJavascript(DataContextStack dataContext, Expression expression)
{
var currentContextVariable = new JsTemporaryVariableParameter(new JsIdentifierExpression("ko").Member("contextFor").Invoke(new JsSymbolicParameter(CommandBindingExpression.SenderElementParameter)));
// var resultPromiseVariable = new JsNewExpression("DotvvmPromise"));
var senderVariable = new JsTemporaryVariableParameter(new JsSymbolicParameter(CommandBindingExpression.SenderElementParameter));
var visitor = new ExtractExpressionVisitor(ex => {
if (ex.NodeType == ExpressionType.Call && ex is MethodCallExpression methodCall)
{
if (javascriptTranslator.TryTranslateMethodCall(methodCall.Object, methodCall.Arguments.ToArray(), methodCall.Method, dataContext) is JsExpression jsTranslation)
{
if (jsTranslation.Annotation <ResultIsPromiseAnnotation>() is ResultIsPromiseAnnotation promiseAnnotation)
{
return(p => new BindingParameterAnnotation(extensionParameter: new JavascriptTranslationVisitor.FakeExtensionParameter(_ => new JsIdentifierExpression(p.Name).WithAnnotations(promiseAnnotation.ResultAnnotations), p.Name, new ResolvedTypeDescriptor(p.Type))));
}
else
{
return(null);
}
}
return(p => new BindingParameterAnnotation(extensionParameter: new JavascriptTranslationVisitor.FakeExtensionParameter(_ => new JsIdentifierExpression(p.Name).WithAnnotation(new ViewModelInfoAnnotation(p.Type)), p.Name, new ResolvedTypeDescriptor(p.Type))));
}
return(null);
});
var rootCallback = visitor.Visit(expression);
var js = SouldCompileCallback(rootCallback) ? new JsIdentifierExpression("resolve").Invoke(javascriptTranslator.CompileToJavascript(rootCallback, dataContext)) : null;
foreach (var param in visitor.ParameterOrder.Reverse <ParameterExpression>())
{
js = js ?? new JsIdentifierExpression("resolve").Invoke(new JsIdentifierExpression(param.Name));
var callback = new JsFunctionExpression(new[] { new JsIdentifier(param.Name) }, new JsBlockStatement(new JsExpressionStatement(js)));
var method = visitor.Replaced[param] as MethodCallExpression;
js = CompileMethodCall(method, dataContext, callback);
}
foreach (var sp in js.Descendants.OfType <JsSymbolicParameter>())
{
if (sp.Symbol == JavascriptTranslator.KnockoutContextParameter)
{
sp.Symbol = currentContextVariable;
}
else if (sp.Symbol == JavascriptTranslator.KnockoutViewModelParameter)
{
sp.ReplaceWith(new JsSymbolicParameter(currentContextVariable).Member("$data"));
}
else if (sp.Symbol == CommandBindingExpression.SenderElementParameter)
{
sp.Symbol = senderVariable;
}
}
if (js is JsInvocationExpression invocation && invocation.Target is JsIdentifierExpression identifier && identifier.Identifier == "resolve")
{
// optimize `new Promise(function (resolve) { resolve(x) })` to `Promise.resolve(x)`
identifier.ReplaceWith(new JsIdentifierExpression("Promise").Member("resolve"));
return(js);
}
public JsExpression TryTranslateCall(LazyTranslatedExpression context, LazyTranslatedExpression[] arguments, MethodInfo method)
{
var tmp = new JsTemporaryVariableParameter();
return(new JsBinaryExpression(
new JsAssignmentExpression(new JsSymbolicParameter(tmp), new JsInvocationExpression(new JsIdentifierExpression("dotvvm").Member("globalize").Member("parseDotvvmDate"), context.JsExpression())),
BinaryOperatorType.Sequence,
new JsNewExpression("Date",
new JsInvocationExpression(new JsMemberAccessExpression(new JsSymbolicParameter(tmp), "getFullYear")),
new JsInvocationExpression(new JsMemberAccessExpression(new JsSymbolicParameter(tmp), "getMonth")),
new JsBinaryExpression(new JsInvocationExpression(new JsMemberAccessExpression(new JsSymbolicParameter(tmp), "getDate")), BinaryOperatorType.Plus, arguments[0].JsExpression()),
new JsInvocationExpression(new JsMemberAccessExpression(new JsSymbolicParameter(tmp), "getHours")),
new JsInvocationExpression(new JsMemberAccessExpression(new JsSymbolicParameter(tmp), "getMinutes")),
new JsInvocationExpression(new JsMemberAccessExpression(new JsSymbolicParameter(tmp), "getSeconds")),
new JsInvocationExpression(new JsMemberAccessExpression(new JsSymbolicParameter(tmp), "getMilliseconds"))
)
));
}
public override void VisitAssignmentExpression(JsAssignmentExpression assignmentExpression)
{
base.VisitAssignmentExpression(assignmentExpression);
// change assignment to observable property to observable invocation
// only do for RestultIsObservable, not ResultMayBeObservable
if (assignmentExpression.Left.HasAnnotation <ResultIsObservableAnnotation>())
{
var value = assignmentExpression.Right.Detach();
var assignee = assignmentExpression.Left.Detach();
assignee.RemoveAnnotations <ResultIsObservableAnnotation>();
if (value.IsComplexType())
{
assignmentExpression.ReplaceWith(_ => new JsIdentifierExpression("dotvvm").Member("serialization").Member("deserialize").Invoke(value, assignee));
}
else
{
// A = B -> A(B)
assignee.RemoveAnnotations <MayBeNullAnnotation>();
JsExpression newExpression = new JsInvocationExpression(assignee, value)
.WithAnnotation(ObservableSetterInvocationAnnotation.Instance);
if (assignmentExpression.Parent is JsExpression resultConsumer)
{
// assignment's result
if (assignee is JsMemberAccessExpression memberAccess)
{
// x.A(B) -> x.A(B).A
newExpression = AddAnnotations(newExpression.Member(memberAccess.MemberName).Invoke().WithAnnotation(ObservableUnwrapInvocationAnnotation.Instance), value);
}
else
{
// f() = CC -> f()(_a = CC), _a
var tmp = new JsTemporaryVariableParameter();
value.ReplaceWith(_ => new JsAssignmentExpression(new JsSymbolicParameter(tmp), value));
newExpression = AddAnnotations(new JsBinaryExpression(newExpression, BinaryOperatorType.Sequence, new JsSymbolicParameter(tmp)), value);
}
}
assignmentExpression.ReplaceWith(newExpression);
}
}
}
