alandonovan | 9d97771 | 2019-01-04 13:04:59 -0500 | [diff] [blame] | 1 | package starlarkstruct |
| 2 | |
| 3 | import ( |
| 4 | "fmt" |
| 5 | |
| 6 | "go.starlark.net/starlark" |
| 7 | ) |
| 8 | |
| 9 | // A Module is a named collection of values, |
| 10 | // typically a suite of functions imported by a load statement. |
| 11 | // |
| 12 | // It differs from Struct primarily in that its string representation |
| 13 | // does not enumerate its fields. |
| 14 | type Module struct { |
| 15 | Name string |
| 16 | Members starlark.StringDict |
| 17 | } |
| 18 | |
| 19 | var _ starlark.HasAttrs = (*Module)(nil) |
| 20 | |
| 21 | func (m *Module) Attr(name string) (starlark.Value, error) { return m.Members[name], nil } |
| 22 | func (m *Module) AttrNames() []string { return m.Members.Keys() } |
| 23 | func (m *Module) Freeze() { m.Members.Freeze() } |
| 24 | func (m *Module) Hash() (uint32, error) { return 0, fmt.Errorf("unhashable: %s", m.Type()) } |
| 25 | func (m *Module) String() string { return fmt.Sprintf("<module %q>", m.Name) } |
| 26 | func (m *Module) Truth() starlark.Bool { return true } |
| 27 | func (m *Module) Type() string { return "module" } |
| 28 | |
| 29 | // MakeModule may be used as the implementation of a Starlark built-in |
| 30 | // function, module(name, **kwargs). It returns a new module with the |
| 31 | // specified name and members. |
| 32 | func MakeModule(thread *starlark.Thread, b *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) { |
| 33 | var name string |
| 34 | if err := starlark.UnpackPositionalArgs(b.Name(), args, nil, 1, &name); err != nil { |
| 35 | return nil, err |
| 36 | } |
| 37 | members := make(starlark.StringDict, len(kwargs)) |
| 38 | for _, kwarg := range kwargs { |
| 39 | k := string(kwarg[0].(starlark.String)) |
| 40 | members[k] = kwarg[1] |
| 41 | } |
| 42 | return &Module{name, members}, nil |
| 43 | } |