fsmod

var File = &native.Class{
	Name: "File",
	Methods: map[string]value.NativeMethod{
		"readline": method("readline", 0, 0, readline),
		"read":     method("read", 0, 1, read),
		"write":    method("write", 1, -1, write),
		"print":    method("print", 0, -1, printer("")),
		"println":  method("println", 0, -1, printer("\n")),
		"seek":     method("seek", 1, 2, seek),
		"tell":     method("tell", 0, 0, tell),
		"truncate": method("truncate", 0, 1, truncate),
		"lock":     method("lock", 0, 2, lock),
		"unlock":   method("unlock", 0, 0, unlock),
		"flush":    method("flush", 0, 0, flush),
		"close":    method("close", 0, 0, closeFile),
		"iter":     method("iter", 0, 0, lines),
		"text":     method("text", 0, 0, text),
		"closed": method("closed", 0, 0, func(a native.Args, env value.Env, f *file) (value.Value, error) {
			return value.MakeBool(f.closed), nil
		}),
		"name": method("name", 0, 0, func(a native.Args, env value.Env, f *file) (value.Value, error) {
			if f.mem != nil {
				return value.NilValue, nil
			}
			return value.MakeString(f.name), nil
		}),
		"mode": method("mode", 0, 0, func(a native.Args, env value.Env, f *file) (value.Value, error) {
			return value.MakeString(f.mode), nil
		}),
	},
	Show: func(o *value.ObjectObj) string {
		f := o.State.(*file)
		switch {
		case f.std != 0:
			return "fs::File(" + f.name + ")"
		case f.mem != nil && f.closed:
			return "fs::File(<memory>, closed)"
		case f.mem != nil:
			return fmt.Sprintf("fs::File(<memory>, %d bytes)", len(f.mem.data))
		case f.closed:
			return fmt.Sprintf("fs::File(%q, closed)", f.name)
		}
		return fmt.Sprintf("fs::File(%q, %q)", f.name, f.mode)
	},
}