private void ProjectMethods(string owningTypeName, JavaScriptObject target, JavaScriptEngine engine, IEnumerable <MethodInfo> methods)
{
var methodsByName = methods.GroupBy(m => m.Name);
foreach (var group in methodsByName)
{
var method = engine.CreateFunction((eng, ctor, thisObj, args) =>
{
var @this = thisObj as JavaScriptObject;
if (@this == null)
{
eng.SetException(eng.CreateTypeError("Could not call method '" + group.Key + "' because there was an invalid 'this' context."));
return(eng.UndefinedValue);
}
var argsArray = args.ToArray();
var candidate = GetBestFitMethod(group, thisObj, argsArray);
if (candidate == null)
{
eng.SetException(eng.CreateReferenceError("Could not find suitable method or not enough arguments to invoke '" + group.Key + "'."));
return(eng.UndefinedValue);
}
List <object> argsToPass = new List <object>();
for (int i = 0; i < candidate.GetParameters().Length; i++)
{
argsToPass.Add(ToObject(argsArray[i]));
}
try
{
return(FromObject(candidate.Invoke(@this.ExternalObject, argsToPass.ToArray())));
}
catch (Exception ex)
{
eng.SetException(FromObject(ex));
return(eng.UndefinedValue);
}
}, owningTypeName + "." + group.Key);
//var propDescriptor = engine.CreateObject();
//propDescriptor.SetPropertyByName("configurable", engine.TrueValue);
//propDescriptor.SetPropertyByName("enumerable", engine.TrueValue);
//propDescriptor.SetPropertyByName("value", method);
//target.DefineProperty(group.Key, propDescriptor);
target.SetPropertyByName(group.Key, method);
}
}
private void ProjectEvents(string owningTypeName, JavaScriptObject target, JavaScriptEngine engine, IEnumerable<EventInfo> events, JavaScriptProjection baseTypeProjection, bool instance)
{
var eventsArray = events.ToArray();
var eventsLookup = eventsArray.ToDictionary(ei => ei.Name.ToLower());
// General approach here
// if there is a base thing, invoke that
// for each event, register a delegate that marshals it back to JavaScript
var add = engine.CreateFunction((eng, ctor, thisObj, args) =>
{
bool callBase = instance && (baseTypeProjection?.HasInstanceEvents ?? false);
var @this = thisObj as JavaScriptObject;
if (@this == null)
return eng.UndefinedValue;
if (callBase)
{
var baseObj = baseTypeProjection.Prototype;
var baseFn = baseObj.GetPropertyByName("addEventListener") as JavaScriptFunction;
if (baseFn != null)
{
baseFn.Call(@this, args);
}
}
var argsArray = args.ToArray();
if (argsArray.Length < 2)
return eng.UndefinedValue;
string eventName = argsArray[0].ToString();
JavaScriptFunction callbackFunction = argsArray[1] as JavaScriptFunction;
if (callbackFunction == null)
return eng.UndefinedValue;
EventInfo curEvent;
if (!eventsLookup.TryGetValue(eventName, out curEvent))
return eng.UndefinedValue;
MethodInfo targetMethod = curEvent.EventHandlerType.GetMethod("Invoke");
var paramsExpr = targetMethod.GetParameters().Select(p => Expression.Parameter(p.ParameterType, p.Name)).ToArray();
int cookie = EventMarshaler.RegisterDelegate(callbackFunction, SynchronizationContext.Current);
var marshaler = Expression.Lambda(curEvent.EventHandlerType, Expression.Block(
Expression.Call(
typeof(EventMarshaler).GetMethod(nameof(EventMarshaler.InvokeJavaScriptCallback)),
Expression.Constant(cookie),
Expression.NewArrayInit(typeof(string), targetMethod.GetParameters().Select(p => Expression.Constant(p.Name))),
Expression.NewArrayInit(typeof(object), paramsExpr))
), paramsExpr);
curEvent.AddMethod.Invoke(@this.ExternalObject, new object[] { marshaler.Compile() });
return eng.UndefinedValue;
}, owningTypeName + ".addEventListener");
target.SetPropertyByName("addEventListener", add);
}
private void ProjectProperties(string owningTypeName, JavaScriptObject target, JavaScriptEngine engine, IEnumerable<PropertyInfo> properties)
{
foreach (var prop in properties)
{
if (prop.GetIndexParameters().Length > 0)
throw new NotSupportedException("Index properties not supported for projecting CLR to JavaScript objects.");
JavaScriptFunction jsGet = null, jsSet = null;
if (prop.GetMethod != null)
{
jsGet = engine.CreateFunction((eng, ctor, thisObj, args) =>
{
var @this = thisObj as JavaScriptObject;
if (@this == null)
{
eng.SetException(eng.CreateTypeError("Could not retrieve property '" + prop.Name + "' because there was an invalid 'this' context."));
return eng.UndefinedValue;
}
try
{
return FromObject(prop.GetValue(@this.ExternalObject));
}
catch (Exception ex)
{
eng.SetException(FromObject(ex));
return eng.UndefinedValue;
}
}, owningTypeName + "." + prop.Name + ".get");
}
if (prop.SetMethod != null)
{
jsSet = engine.CreateFunction((eng, ctor, thisObj, args) =>
{
var @this = thisObj as JavaScriptObject;
if (@this == null)
{
eng.SetException(eng.CreateTypeError("Could not retrieve property '" + prop.Name + "' because there was an invalid 'this' context."));
return eng.UndefinedValue;
}
try
{
var val = ToObject(args.First());
if (prop.PropertyType == typeof(int))
{
val = (int)(double)val;
}
prop.SetValue(@this.ExternalObject, val);
return eng.UndefinedValue;
}
catch (Exception ex)
{
eng.SetException(FromObject(ex));
return eng.UndefinedValue;
}
}, owningTypeName + "." + prop.Name + ".set");
}
var descriptor = engine.CreateObject();
if (jsGet != null)
descriptor.SetPropertyByName("get", jsGet);
if (jsSet != null)
descriptor.SetPropertyByName("set", jsSet);
descriptor.SetPropertyByName("enumerable", engine.TrueValue);
target.DefineProperty(prop.Name, descriptor);
}
}
private void ProjectMethods(string owningTypeName, JavaScriptObject target, JavaScriptEngine engine, IEnumerable<MethodInfo> methods)
{
var methodsByName = methods.GroupBy(m => m.Name);
foreach (var group in methodsByName)
{
var method = engine.CreateFunction((eng, ctor, thisObj, args) =>
{
var @this = thisObj as JavaScriptObject;
if (@this == null)
{
eng.SetException(eng.CreateTypeError("Could not call method '" + group.Key + "' because there was an invalid 'this' context."));
return eng.UndefinedValue;
}
var argsArray = args.ToArray();
var candidate = GetBestFitMethod(group, thisObj, argsArray);
if (candidate == null)
{
eng.SetException(eng.CreateReferenceError("Could not find suitable method or not enough arguments to invoke '" + group.Key + "'."));
return eng.UndefinedValue;
}
List<object> argsToPass = new List<object>();
for (int i = 0; i < candidate.GetParameters().Length; i++)
{
argsToPass.Add(ToObject(argsArray[i]));
}
try
{
return FromObject(candidate.Invoke(@this.ExternalObject, argsToPass.ToArray()));
}
catch (Exception ex)
{
eng.SetException(FromObject(ex));
return eng.UndefinedValue;
}
}, owningTypeName + "." + group.Key);
//var propDescriptor = engine.CreateObject();
//propDescriptor.SetPropertyByName("configurable", engine.TrueValue);
//propDescriptor.SetPropertyByName("enumerable", engine.TrueValue);
//propDescriptor.SetPropertyByName("value", method);
//target.DefineProperty(group.Key, propDescriptor);
target.SetPropertyByName(group.Key, method);
}
}
private void ProjectEvents(string owningTypeName, JavaScriptObject target, JavaScriptEngine engine, IEnumerable <EventInfo> events, JavaScriptProjection baseTypeProjection, bool instance)
{
var eventsArray = events.ToArray();
var eventsLookup = eventsArray.ToDictionary(ei => ei.Name.ToLower());
// General approach here
// if there is a base thing, invoke that
// for each event, register a delegate that marshals it back to JavaScript
var add = engine.CreateFunction((eng, ctor, thisObj, args) =>
{
bool callBase = instance && (baseTypeProjection?.HasInstanceEvents ?? false);
var @this = thisObj as JavaScriptObject;
if (@this == null)
{
return(eng.UndefinedValue);
}
if (callBase)
{
var baseObj = baseTypeProjection.Prototype;
var baseFn = baseObj.GetPropertyByName("addEventListener") as JavaScriptFunction;
if (baseFn != null)
{
baseFn.Call(@this, args);
}
}
var argsArray = args.ToArray();
if (argsArray.Length < 2)
{
return(eng.UndefinedValue);
}
string eventName = argsArray[0].ToString();
JavaScriptFunction callbackFunction = argsArray[1] as JavaScriptFunction;
if (callbackFunction == null)
{
return(eng.UndefinedValue);
}
EventInfo curEvent;
if (!eventsLookup.TryGetValue(eventName, out curEvent))
{
return(eng.UndefinedValue);
}
MethodInfo targetMethod = curEvent.EventHandlerType.GetMethod("Invoke");
var paramsExpr = targetMethod.GetParameters().Select(p => Expression.Parameter(p.ParameterType, p.Name)).ToArray();
int cookie = EventMarshaler.RegisterDelegate(callbackFunction, SynchronizationContext.Current);
var marshaler = Expression.Lambda(curEvent.EventHandlerType, Expression.Block(
Expression.Call(
typeof(EventMarshaler).GetMethod(nameof(EventMarshaler.InvokeJavaScriptCallback)),
Expression.Constant(cookie),
Expression.NewArrayInit(typeof(string), targetMethod.GetParameters().Select(p => Expression.Constant(p.Name))),
Expression.NewArrayInit(typeof(object), paramsExpr))
), paramsExpr);
curEvent.AddMethod.Invoke(@this.ExternalObject, new object[] { marshaler.Compile() });
return(eng.UndefinedValue);
}, owningTypeName + ".addEventListener");
target.SetPropertyByName("addEventListener", add);
}
private void ProjectProperties(string owningTypeName, JavaScriptObject target, JavaScriptEngine engine, IEnumerable <PropertyInfo> properties)
{
foreach (var prop in properties)
{
if (prop.GetIndexParameters().Length > 0)
{
throw new NotSupportedException("Index properties not supported for projecting CLR to JavaScript objects.");
}
JavaScriptFunction jsGet = null, jsSet = null;
if (prop.GetMethod != null)
{
jsGet = engine.CreateFunction((eng, ctor, thisObj, args) =>
{
var @this = thisObj as JavaScriptObject;
if (@this == null)
{
eng.SetException(eng.CreateTypeError("Could not retrieve property '" + prop.Name + "' because there was an invalid 'this' context."));
return(eng.UndefinedValue);
}
object external = null;
if (!prop.GetMethod.IsStatic)
{
external = @this.ExternalObject;
if (external == null)
{
external = @this.Prototype.ExternalObject;
}
if (external == null)
{
throw new Exception("this object not found for method invocation. Perhaps it has been garbage collected.");
}
}
try
{
return(FromObject(prop.GetValue(external)));
}
catch (Exception ex)
{
eng.SetException(FromObject(ex), ex);
return(eng.UndefinedValue);
}
}, owningTypeName + "." + prop.Name + ".get");
}
if (prop.SetMethod != null)
{
jsSet = engine.CreateFunction((eng, ctor, thisObj, args) =>
{
var @this = thisObj as JavaScriptObject;
if (@this == null)
{
eng.SetException(eng.CreateTypeError("Could not retrieve property '" + prop.Name + "' because there was an invalid 'this' context."));
return(eng.UndefinedValue);
}
try
{
var val = ToObject(args.First());
if (prop.PropertyType == typeof(int))
{
val = (int)(double)val;
}
var obj = @this.ExternalObject;
if (obj == null && @this.Prototype.ExternalObject == engine.GlobalObject.Prototype.ExternalObject)
{
obj = @this.Prototype.ExternalObject;
}
prop.SetValue(obj, val);
return(eng.UndefinedValue);
}
catch (Exception ex)
{
eng.SetException(FromObject(ex), ex);
return(eng.UndefinedValue);
}
}, owningTypeName + "." + prop.Name + ".set");
}
var descriptor = engine.CreateObject();
if (jsGet != null)
{
descriptor.SetPropertyByName("get", jsGet);
}
if (jsSet != null)
{
descriptor.SetPropertyByName("set", jsSet);
}
descriptor.SetPropertyByName("enumerable", engine.TrueValue);
target.DefineProperty(prop.Name, descriptor);
}
}
