public void JsFormatter_FunctionExpression()
{
var expr = new JsFunctionExpression(new[] { new JsIdentifier("a") }, new JsBlockStatement(new JsReturnStatement(new JsBinaryExpression(new JsIdentifierExpression("a"), BinaryOperatorType.Plus, new JsLiteral(2)))));
Assert.AreEqual("function(a){return a+2;}", expr.FormatScript());
Assert.AreEqual("function(a) {\n\treturn a + 2;\n}", expr.FormatScript(niceMode: true));
}
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);
}
private static string GenerateHandlerOptions(DotvvmBindableObject handler, Dictionary <string, object> options)
{
JsExpression optionsExpr = new JsObjectExpression(
options.Where(o => o.Value != null).Select(o => new JsObjectProperty(o.Key, TransformOptionValueToExpression(handler, o.Value)))
);
if (options.Any(o => o.Value is IValueBinding))
{
optionsExpr = new JsFunctionExpression(
new[] { new JsIdentifier("c"), new JsIdentifier("d") },
new JsBlockStatement(new JsReturnStatement(optionsExpr))
);
}
optionsExpr.FixParenthesis();
var script = new JsFormattingVisitor().ApplyAction(optionsExpr.AcceptVisitor).GetParameterlessResult();
return(script);
}
private static string GenerateHandlerOptions(DotvvmBindableObject handler, Dictionary <string, object> options)
{
JsExpression optionsExpr = new JsObjectExpression(
options.Where(o => o.Value != null).Select(o => new JsObjectProperty(o.Key, o.Value is IValueBinding b ?
(JsExpression) new JsIdentifierExpression(
JavascriptTranslator.FormatKnockoutScript(b.GetParametrizedKnockoutExpression(handler, unwrapped: true), new ParametrizedCode("c"), new ParametrizedCode("d"))) :
new JsLiteral(o.Value)))
);
if (options.Any(o => o.Value is IValueBinding))
{
optionsExpr = new JsFunctionExpression(
new[] { new JsIdentifier("c"), new JsIdentifier("d") },
new JsBlockStatement(new JsReturnStatement(optionsExpr))
);
}
optionsExpr.FixParenthesis();
var script = new JsFormattingVisitor().ApplyAction(optionsExpr.AcceptVisitor).GetParameterlessResult();
return(script);
}
