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builtin: add dir builtin #20

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builtin: add dir builtin #20

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sbinet commented Aug 30, 2018

Fixes #12.
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builtin: add dir builtin
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2b22f72 
Fixes #12.
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sbinet commented Aug 30, 2018

this is a WIP.

@ncw, for dir(), I need to be able to get at the content of the local scope.
how would I do that from within builtin_dir ?
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ncw commented Sep 3, 2018

The way I've done that in the past, eg for implementing locals() is to implement them as InternalMethods.

Eg here is where the magic is...

gpython/vm/eval.go

Lines 1578 to 1600 in eaa7d28

func callInternal(fn py.Object, args py.Tuple, kwargs py.StringDict, f *py.Frame) (py.Object, error) {
if method, ok := fn.(*py.Method); ok {
switch x := method.Internal(); x {
case py.InternalMethodNone:
case py.InternalMethodGlobals:
return f.Globals, nil
case py.InternalMethodLocals:
f.FastToLocals()
return f.Locals, nil
case py.InternalMethodImport:
return py.BuiltinImport(nil, args, kwargs, f.Globals)
case py.InternalMethodEval:
f.FastToLocals()
return builtinEval(nil, args, kwargs, f.Locals, f.Globals, f.Builtins)
case py.InternalMethodExec:
f.FastToLocals()
return builtinExec(nil, args, kwargs, f.Locals, f.Globals, f.Builtins)
default:
return nil, py.ExceptionNewf(py.SystemError, "Internal method %v not found", x)
}
}
return py.Call(fn, args, kwargs)
}

This is where the other magic is!

$ git grep InternalMethodLocals
builtin/builtin.go:             py.MustNewMethod("locals", py.InternalMethodLocals, 0, locals_doc),
py/method.go:   InternalMethodLocals
vm/eval.go:             case py.InternalMethodLocals:

That is the only way I could find to avoid using global variables etc. It might be too limiting eventually.
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