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package starlarkstruct
import (
// A Module is a named collection of values,
// typically a suite of functions imported by a load statement.
// It differs from Struct primarily in that its string representation
// does not enumerate its fields.
type Module struct {
Name string
Members starlark.StringDict
var _ starlark.HasAttrs = (*Module)(nil)
func (m *Module) Attr(name string) (starlark.Value, error) { return m.Members[name], nil }
func (m *Module) AttrNames() []string { return m.Members.Keys() }
func (m *Module) Freeze() { m.Members.Freeze() }
func (m *Module) Hash() (uint32, error) { return 0, fmt.Errorf("unhashable: %s", m.Type()) }
func (m *Module) String() string { return fmt.Sprintf("<module %q>", m.Name) }
func (m *Module) Truth() starlark.Bool { return true }
func (m *Module) Type() string { return "module" }
// MakeModule may be used as the implementation of a Starlark built-in
// function, module(name, **kwargs). It returns a new module with the
// specified name and members.
func MakeModule(thread *starlark.Thread, b *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
var name string
if err := starlark.UnpackPositionalArgs(b.Name(), args, nil, 1, &name); err != nil {
return nil, err
members := make(starlark.StringDict, len(kwargs))
for _, kwarg := range kwargs {
k := string(kwarg[0].(starlark.String))
members[k] = kwarg[1]
return &Module{name, members}, nil
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