private static JsFunction WrapSetFieldCore(FieldInfo field)
{
if (field == null)
throw new ArgumentNullException("field");
var builder = new Builder();
builder.AddRuntimeParameter();
builder.AddThisParameter(typeof(object));
builder.AddParameter(typeof(JsObject), "callee");
var argumentsParameter = builder.AddParameter(typeof(object[]), "arguments");
var local = builder.AddLocal(typeof(object), "value");
builder.AddStatement(Expression.Assign(
local,
Expression.ArrayAccess(
argumentsParameter,
Expression.Constant(0)
)
));
// Can't assign to constants.
if (!field.IsLiteral && !field.IsInitOnly)
{
builder.AddStatement(Expression.Assign(
Expression.Field(
builder.MarshalThis(field.DeclaringType, field.IsStatic),
field
),
builder.Marshal(local, field.FieldType)
));
}
builder.AddStatement(local);
return builder.Compile<JsFunction>();
}
private static JsFunction WrapSetPropertyCore(PropertyInfo property)
{
var builder = new Builder();
builder.AddRuntimeParameter();
builder.AddThisParameter(typeof(object));
builder.AddParameter(typeof(JsObject), "callee");
var argumentsParameter = builder.AddParameter(typeof(object[]), "arguments");
var method = property.GetSetMethod();
var local = builder.AddLocal(typeof(object), "value");
builder.AddStatement(Expression.Assign(
local,
Expression.ArrayAccess(
argumentsParameter,
Expression.Constant(0)
)
));
builder.AddStatement(Expression.Assign(
Expression.Property(
builder.MarshalThis(method.DeclaringType, method.IsStatic),
property
),
builder.Marshal(
local,
property.PropertyType
)
));
builder.AddStatement(local);
return builder.Compile<JsFunction>();
}
private static JsFunction WrapMethodCore(MethodInfo method)
{
var builder = new Builder();
builder.AddRuntimeParameter();
builder.AddThisParameter(typeof(object));
builder.AddParameter(typeof(JsObject), "callee");
var argumentsParameter = builder.AddParameter(typeof(object[]), "arguments");
var methodThis = builder.MarshalThis(method.DeclaringType, method.IsStatic);
var arguments = new List<Expression>();
var parameters = method.GetParameters();
bool skipFirst = false;
if (parameters.Length > 0 && typeof(JsGlobal).IsAssignableFrom(parameters[0].ParameterType))
{
skipFirst = true;
arguments.Add(builder.Global);
}
var outParameters = new List<Tuple<ParameterInfo, ParameterExpression, int>>();
int index = 0;
foreach (var parameter in parameters)
{
// Skip over the global parameter.
if (skipFirst)
{
skipFirst = false;
continue;
}
// Get the argument from the array, or undefined there is none.
Expression argument = Expression.Condition(
Expression.GreaterThan(
Expression.ArrayLength(argumentsParameter),
Expression.Constant(index)
),
Expression.ArrayAccess(
argumentsParameter,
Expression.Constant(index)
),
Expression.Field(null, typeof(JsUndefined).GetField("Instance")),
typeof(object)
);
// If this is a ref or out parameter, we need to create a local.
if (parameter.ParameterType.IsByRef)
{
var parameterType = parameter.ParameterType.GetElementType();
argument = builder.Marshal(argument, parameterType);
// Create a local to hold the value.
var tmpLocal = builder.AddLocal(
parameterType,
"tmp"
);
// Add the assignment to the statements.
builder.AddStatement(Expression.Assign(tmpLocal, argument));
// And use the temp local as the parameter.
argument = tmpLocal;
// Register it so that we do a write-back later on.
outParameters.Add(Tuple.Create(parameter, tmpLocal, index));
}
else
{
argument = builder.Marshal(argument, parameter.ParameterType);
}
// Add the argument to the list.
arguments.Add(argument);
// Move on to the next argument.
index++;
}
// Call the method.
Expression methodCall = Expression.Call(
methodThis,
method,
arguments
);
// Are we returning a value?
ParameterExpression returnLocal = null;
if (method.ReturnType != typeof(void))
{
returnLocal = builder.AddLocal(method.ReturnType, "return");
methodCall = Expression.Assign(
returnLocal,
methodCall
);
}
// Add the method call to the statements.
builder.AddStatement(methodCall);
// Process any out parameters.
foreach (var outParameter in outParameters)
{
// Put the result back into the arguments array if the array
// is long enough.
builder.AddStatement(Expression.IfThen(
Expression.GreaterThan(
Expression.ArrayLength(argumentsParameter),
Expression.Constant(outParameter.Item3)
),
Expression.Assign(
Expression.ArrayAccess(
argumentsParameter,
Expression.Constant(outParameter.Item3)
),
Expression.Call(
builder.Marshaller,
_marshalClr.MakeGenericMethod(outParameter.Item1.ParameterType.GetElementType()),
outParameter.Item2
)
)
));
}
// Create the result.
builder.AddStatement(
returnLocal != null
? builder.UnMarshal(returnLocal, method.ReturnType)
: Expression.Field(null, typeof(JsUndefined).GetField("Instance"))
);
return builder.Compile<JsFunction>();
}