59 lines
1.3 KiB
Go
59 lines
1.3 KiB
Go
/*
|
|
Serene --- Yet an other Lisp
|
|
|
|
Copyright (c) 2020 Sameer Rahmani <lxsameer@gnu.org>
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation, either version 2 of the License.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
package core
|
|
|
|
type IScope interface {
|
|
Lookup(k string) *Binding
|
|
Insert(k string, v IExpr, public bool)
|
|
}
|
|
|
|
type Binding struct {
|
|
Value IExpr
|
|
Public bool
|
|
}
|
|
|
|
type Scope struct {
|
|
bindings map[string]Binding
|
|
parent *Scope
|
|
}
|
|
|
|
func (s *Scope) Lookup(k string) *Binding {
|
|
v, ok := s.bindings[k]
|
|
if ok {
|
|
return &v
|
|
}
|
|
|
|
if s.parent != nil {
|
|
return s.parent.Lookup(k)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (s *Scope) Insert(k string, v IExpr, public bool) {
|
|
s.bindings[k] = Binding{Value: v, Public: public}
|
|
}
|
|
|
|
func MakeScope(parent *Scope) *Scope {
|
|
return &Scope{
|
|
parent: parent,
|
|
bindings: map[string]Binding{},
|
|
}
|
|
}
|