public static FunctionObject FunctionCreate(FunctionCreateKind kind, FormalParameters parameters, FunctionStatementList body, LexicalEnvironment scope, bool strict, IValue?prototype = null)
{
if (prototype == null)
{
prototype = Interpreter.Instance().CurrentRealm().Intrinsics.FunctionPrototype;
}
var functionKind = kind == FunctionCreateKind.Normal ? FunctionKind.Normal : FunctionKind.NonConstructor;
FunctionObject F = FunctionAllocate(prototype, strict, functionKind);
return(FunctionInitialize(F, kind, parameters, body, scope));
}
public static FunctionObject FunctionInitialize(FunctionObject f, FunctionCreateKind kind, FormalParameters parameters, FunctionStatementList body, LexicalEnvironment scope)
{
var len = parameters.ExpectedArgumentCount();
f.DefinePropertyOrThrow("length", new PropertyDescriptor(new NumberValue(len), false, false, true));
f.Environment = scope;
f.FormalParameters = parameters;
f.Code = body;
if (kind == FunctionCreateKind.Arrow)
{
f.ThisMode = ThisMode.Lexical;
}
else if (f.Strict)
{
f.ThisMode = ThisMode.Strict;
}
else
{
f.ThisMode = ThisMode.Global;
}
return(f);
}