/// <summary>
/// Creates a new JavaScript error object
/// </summary>
/// <remarks>
/// Requires an active script context.
/// </remarks>
/// <param name="message">The message that describes the error</param>
/// <returns>The new error object</returns>
public static JsValue CreateError(string message)
{
JsValue messageValue = JsValue.FromString(message);
JsValue errorValue = JsValue.CreateError(messageValue);
return(errorValue);
}
private void ProjectProperties(EmbeddedItem externalItem, EmbeddingObjectOptions options)
{
Type type = externalItem.HostType;
object obj = externalItem.HostObject;
JsValue typeValue = externalItem.ScriptValue;
IList <JsNativeFunction> nativeFunctions = externalItem.NativeFunctions;
bool instance = externalItem.IsInstance;
string typeName = type.FullName;
BindingFlags defaultBindingFlags = ReflectionHelpers.GetDefaultBindingFlags(instance);
PropertyInfo[] properties = type.GetProperties(defaultBindingFlags).Where(options.IsMapped).ToArray();
foreach (PropertyInfo property in properties)
{
string propertyName = property.Name;
JsValue descriptorValue = JsValue.CreateObject();
descriptorValue.SetProperty("enumerable", JsValue.True, true);
if (property.GetGetMethod() != null)
{
JsValue nativeGetFunction(JsValue callee, bool isConstructCall, JsValue[] args, ushort argCount, IntPtr callbackData)
{
if (instance && obj == null)
{
CreateAndSetError($"Invalid context for '{propertyName}' property.");
return(JsValue.Undefined);
}
object result;
try
{
result = property.GetValue(obj, new object[0]);
}
catch (Exception e)
{
Exception exception = UnwrapException(e);
var wrapperException = exception as JsException;
JsValue errorValue;
if (wrapperException != null)
{
errorValue = CreateErrorFromWrapperException(wrapperException);
}
else
{
string errorMessage = instance ?
$"Property '{propertyName}' get operation failed: {exception.Message}"
:
$"Property '{propertyName}' of static type '{typeName}' get operation failed: {exception.Message}"
;
errorValue = JsValue.CreateError(JsValue.FromString(errorMessage));
}
JsContext.SetException(errorValue);
return(JsValue.Undefined);
}
JsValue resultValue = MapToScriptType(result);
return(resultValue);
}
nativeFunctions.Add(nativeGetFunction);
JsValue getMethodValue = JsValue.CreateFunction(nativeGetFunction);
descriptorValue.SetProperty("get", getMethodValue, true);
}
if (property.GetSetMethod() != null)
{
JsValue nativeSetFunction(JsValue callee, bool isConstructCall, JsValue[] args, ushort argCount, IntPtr callbackData)
{
JsValue undefinedValue = JsValue.Undefined;
if (instance && obj == null)
{
CreateAndSetError($"Invalid context for '{propertyName}' property.");
return(undefinedValue);
}
object value = MapToHostType(args[1]);
ReflectionHelpers.FixPropertyValueType(ref value, property);
try
{
property.SetValue(obj, value, new object[0]);
}
catch (Exception e)
{
Exception exception = UnwrapException(e);
var wrapperException = exception as JsException;
JsValue errorValue;
if (wrapperException != null)
{
errorValue = CreateErrorFromWrapperException(wrapperException);
}
else
{
string errorMessage = instance ?
$"Host object property '{propertyName}' setting failed: {exception.Message}"
:
$"Host type '{typeName}' property '{propertyName}' setting failed: {exception.Message}"
;
errorValue = JsValue.CreateError(JsValue.FromString(errorMessage));
}
JsContext.SetException(errorValue);
return(undefinedValue);
}
return(undefinedValue);
}
nativeFunctions.Add(nativeSetFunction);
JsValue setMethodValue = JsValue.CreateFunction(nativeSetFunction);
descriptorValue.SetProperty("set", setMethodValue, true);
}
typeValue.DefineProperty(propertyName, descriptorValue);
}
}
private void ProjectMethods(EmbeddedItem externalItem, EmbeddingObjectOptions options)
{
Type type = externalItem.HostType;
object obj = externalItem.HostObject;
JsValue typeValue = externalItem.ScriptValue;
IList <JsNativeFunction> nativeFunctions = externalItem.NativeFunctions;
bool instance = externalItem.IsInstance;
string typeName = type.FullName;
BindingFlags defaultBindingFlags = ReflectionHelpers.GetDefaultBindingFlags(instance);
var methods = type.GetMethods(defaultBindingFlags).Select(options.ExtendInfo)
.Where((m) => m.IsMapped);
var methodGroups = methods.GroupBy(m => m.Name);
foreach (var methodGroup in methodGroups)
{
string methodName = methodGroup.Key;
MethodInfo[] methodCandidates = methodGroup.Select(m => m.Info).ToArray();
JsValue nativeFunction(JsValue callee, bool isConstructCall, JsValue[] args, ushort argCount, IntPtr callbackData)
{
if (instance && obj == null)
{
CreateAndSetError($"Invalid context while calling method '{methodName}'.");
return(JsValue.Undefined);
}
if (!SelectAndProcessFunction(methodCandidates, args, argCount, out MethodInfo bestSelection, out object[] processedArgs))
{
CreateAndSetError($"Suitable method '{methodName}' was not found.");
return(JsValue.Undefined);
}
object result;
try
{
result = bestSelection.Invoke(obj, processedArgs);
}
catch (Exception e)
{
Exception exception = UnwrapException(e);
var wrapperException = exception as JsException;
JsValue errorValue;
if (wrapperException != null)
{
errorValue = CreateErrorFromWrapperException(wrapperException);
}
else
{
string errorMessage = instance ?
$"Host method '{methodName}' invocation error: {exception.Message}"
:
$"Host static type '{typeName}' method '{methodName}' invocation error: {exception.Message}"
;
errorValue = JsValue.CreateError(JsValue.FromString(errorMessage));
}
JsContext.SetException(errorValue);
return(JsValue.Undefined);
}
JsValue resultValue = MapToScriptType(result);
return(resultValue);
}
nativeFunctions.Add(nativeFunction);
JsValue methodValue = JsValue.CreateNamedFunction(methodName, nativeFunction);
typeValue.SetProperty(methodName, methodValue, true);
}
}
private void ProjectFields(EmbeddedItem externalItem, EmbeddingObjectOptions options)
{
Type type = externalItem.HostType;
object obj = externalItem.HostObject;
JsValue typeValue = externalItem.ScriptValue;
bool instance = externalItem.IsInstance;
IList <JsNativeFunction> nativeFunctions = externalItem.NativeFunctions;
string typeName = type.FullName;
BindingFlags defaultBindingFlags = ReflectionHelpers.GetDefaultBindingFlags(instance);
FieldInfo[] fields = type.GetFields(defaultBindingFlags).Where(options.IsMapped).ToArray();
foreach (FieldInfo field in fields)
{
string fieldName = field.Name;
JsValue descriptorValue = JsValue.CreateObject();
descriptorValue.SetProperty("enumerable", JsValue.True, true);
JsNativeFunction nativeGetFunction = (callee, isConstructCall, args, argCount, callbackData) =>
{
if (instance && obj == null)
{
CreateAndSetError($"Context error while invoking getter '{fieldName}'.");
return(JsValue.Undefined);
}
object result;
try
{
result = field.GetValue(obj);
}
catch (Exception e)
{
Exception exception = UnwrapException(e);
var wrapperException = exception as JsException;
JsValue errorValue;
if (wrapperException != null)
{
errorValue = CreateErrorFromWrapperException(wrapperException);
}
else
{
string errorMessage = instance ?
$"Error ocured while reading field '{fieldName}': {exception.Message}"
:
$"Erorr ocured while reading static field '{fieldName}' from type '{typeName}': {exception.Message}"
;
errorValue = JsValue.CreateError(JsValue.FromString(errorMessage));
}
JsContext.SetException(errorValue);
return(JsValue.Undefined);
}
JsValue resultValue = MapToScriptType(result);
return(resultValue);
};
nativeFunctions.Add(nativeGetFunction);
JsValue getMethodValue = JsValue.CreateFunction(nativeGetFunction);
descriptorValue.SetProperty("get", getMethodValue, true);
JsNativeFunction nativeSetFunction = (callee, isConstructCall, args, argCount, callbackData) =>
{
if (instance && obj == null)
{
CreateAndSetError($"Invalid context got host object field {fieldName}.");
return(JsValue.Undefined);
}
object value = MapToHostType(args[1]);
ReflectionHelpers.FixFieldValueType(ref value, field);
try
{
field.SetValue(obj, value);
}
catch (Exception e)
{
Exception exception = UnwrapException(e);
var wrapperException = exception as JsException;
JsValue errorValue;
if (wrapperException != null)
{
errorValue = CreateErrorFromWrapperException(wrapperException);
}
else
{
string errorMessage = instance ?
$"Failed to set value for hosts object field '{fieldName}': {exception.Message}"
:
$"Failed to set value for static type '{typeName}' field '{fieldName}': {exception.Message}"
;
errorValue = JsValue.CreateError(JsValue.FromString(errorMessage));
}
JsContext.SetException(errorValue);
return(JsValue.Undefined);
}
return(JsValue.Undefined);
};
nativeFunctions.Add(nativeSetFunction);
JsValue setMethodValue = JsValue.CreateFunction(nativeSetFunction);
descriptorValue.SetProperty("set", setMethodValue, true);
typeValue.DefineProperty(fieldName, descriptorValue);
}
}