Method ListValues

ast/ast.go:495–505

ListValues provides the constants that make up the list via callback.

(cbCons func(Constant) error, cbNil func() error)

// ListValues provides the constants that make up the list via callback.
func (c Constant) ListValues(cbCons func(Constant) error, cbNil func() error) (error, error) {
	if c.Type != ListShape {
		return fmt.Errorf("not a list constant %v", c), nil
	}
	for ; !c.IsListNil(); c = *c.snd {
		if err := cbCons(*c.fst); err != nil {
			return nil, err
		}
	}
	return nil, cbNil()
}

// ListSeq returns an iterator over the list elements.
func (c Constant) ListSeq() (iter.Seq[Constant], error) {