public bool TryUnwrapJsniExpression(IMethodSymbol method, ExpressionSyntax originalTarget, ExpressionSyntax[] originalArguments, JsExpression target, JsExpression[] arguments, out JsExpression result)
{
// Special compiler handler of Jsni -- these are special methods that translate into otherwise inexpressible javascript
if (Equals(method.ContainingType, Context.Instance.JsniType))
{
if (method.ReducedFrom != null && !Equals(method.ReducedFrom, method))
{
method = method.ReducedFrom;
arguments = new[] { target }.Concat(arguments).ToArray();
originalArguments = new[] { originalTarget }.Concat(originalArguments).ToArray();
}
switch (method.Name)
{
case "apply":
{
if (method.TypeArguments.Any())
{
// First argument is an Action -- we want to deconstruct it to extract the target and method name.
var body = originalArguments[0].GetBody();
var lambdaInvocation = (InvocationExpressionSyntax)body;
var lambdaMethod = (IMethodSymbol)ModelExtensions.GetSymbolInfo(transformer.model, lambdaInvocation).Symbol;
result = Type(lambdaMethod.ContainingType).Member("prototype").Member(lambdaMethod.GetMemberName()).Member("apply").Invoke(arguments[1], arguments[2]);
return true;
}
else
{
result = arguments[0].Member("apply").Invoke(arguments[1], arguments[2]);
return true;
}
}
case "call":
{
if (method.TypeArguments.Any())
{
// First argument is an Action -- we want to deconstruct it to extract the target and method name.
var body = originalArguments[0].GetBody();
var lambdaInvocation = (InvocationExpressionSyntax)body;
var lambdaMethod = (IMethodSymbol)ModelExtensions.GetSymbolInfo(transformer.model, lambdaInvocation).Symbol;
result = Type(lambdaMethod.ContainingType).Member("prototype").Member(lambdaMethod.GetMemberName()).Member("call").Invoke(arguments.Skip(1).ToArray());
return true;
}
else
{
// First argument is an Action -- we want to deconstruct it to extract the target and method name.
result = arguments[0].Member("call").Invoke(arguments.Skip(1).ToArray());
return true;
}
}
case "type":
result = method.TypeArguments.Any() ?
Type(method.TypeArguments.Single()) :
((JsMemberReferenceExpression)((JsInvocationExpression)arguments[0]).Target).Target;
return true;
case "new":
case "@new":
result = Js.New(arguments[0].Parenthetical(), arguments.Skip(1).ToArray());
return true;
case "array":
result = Js.Array(arguments);
return true;
case "invoke":
result = arguments[0].Invoke(arguments.Skip(1).ToArray());
return true;
case "memberset":
{
var memberName = GetConstantString(originalArguments[1]);
result = arguments[0].Member(memberName).Assign(arguments[2]);
return true;
}
case "member":
{
var memberName = GetConstantString(originalArguments[1]);
result = arguments[0].Member(memberName);
return true;
}
case "function":
case "procedure":
var nameArguments = originalArguments.Skip(1).ToArray();
var nameOverrides = nameArguments.Select(x => GetConstantString(x)).ToArray();
var lambda = originalArguments[0];
var lambdaSymbol = (IMethodSymbol)transformer.model.GetSymbolInfo(lambda).Symbol;
var lambdaParameters = lambda.GetParameters();
var jsParameters = lambdaParameters.Select(x => Js.Parameter(x.Identifier.ToString())).Cast<IJsDeclaration>().ToArray();
for (var i = 0; i < nameOverrides.Length; i++)
{
jsParameters[i] = new WrappedParent(jsParameters[i]) { Name = nameOverrides[i] };
}
for (var i = 0; i < jsParameters.Length; i++)
{
var parameter = jsParameters[i];
var symbol = lambdaSymbol.Parameters[i];
transformer.DeclareInCurrentScope(symbol, parameter);
}
var jsBody = new JsBlockStatement();
transformer.PushOutput(jsBody);
var lambdaBody = lambda.GetBody();
var lambdaNode = lambdaBody.Accept(transformer);
JsStatement lambdaStatement;
if (lambdaNode is JsExpression)
{
switch (method.Name)
{
case "function":
lambdaStatement = ((JsExpression)lambdaNode).Return();
break;
default:
lambdaStatement = ((JsExpression)lambdaNode).Express();
break;
}
}
else
{
lambdaStatement = (JsStatement)lambdaNode;
}
result = Js.Function(jsParameters).Body(lambdaStatement);
transformer.PopOutput();
return true;
case "arguments":
result = Js.Reference("arguments");
return true;
case "this":
case "@this":
result = Js.This();
return true;
case "delete":
var deleteTarget = arguments[0];
result = deleteTarget.Delete();
return true;
case "_typeof":
var typeofTarget = arguments[0];
result = Js.TypeOf(typeofTarget);
return true;
case "reference":
result = Js.Reference(GetConstantString(originalArguments[0]));
return true;
case "parseInt":
result = Js.Reference("parseInt").Invoke(arguments);
return true;
case "parseFloat":
result = Js.Reference("parseFloat").Invoke(arguments);
return true;
case "encodeURIComponent":
result = Js.Reference("encodeURIComponent").Invoke(arguments);
return true;
case "decodeURIComponent":
result = Js.Reference("decodeURIComponent").Invoke(arguments);
return true;
case "getComputedStyle":
result = Js.Reference("getComputedStyle").Invoke(arguments);
return true;
case "isNaN":
result = Js.Reference("isNaN").Invoke(arguments);
return true;
case "instanceof":
result = Js.InstanceOf(arguments[0], arguments[1]).Parenthetical();
return true;
case "object":
// Deconstruct the object passed in into a JS object
var obj = (AnonymousObjectCreationExpressionSyntax)originalArguments[0];
result = Js.Object(
obj.Initializers.Select(x => Js.Item(
x.NameEquals.Name.ToString(),
(JsExpression)x.Expression.Accept(transformer)
)).ToArray()
);
if (arguments.Length > 1 && originalArguments[1].IsTrue())
{
result = result.Compact();
}
return true;
case "regex":
result = new JsRegexExpression(GetConstantString(originalArguments[0]));
if (originalArguments.Length > 1)
((JsRegexExpression)result).Suffix = GetConstantString(originalArguments[1]);
return true;
case "in":
result = arguments[0].In(arguments[1]);
return true;
case "setTimeout":
result = Js.Reference("setTimeout").Invoke(arguments[0], arguments[1]);
return true;
case "setInterval":
result = Js.Reference("setInterval").Invoke(arguments[0], arguments[1]);
return true;
case "clearTimeout":
result = Js.Reference("clearTimeout").Invoke(arguments[0]);
return true;
case "clearInterval":
result = Js.Reference("clearInterval").Invoke(arguments[0]);
return true;
case "code":
result = new JsNativeExpression(GetConstantString(originalArguments[0]));
return true;
}
}
result = null;
return false;
}
