105 lines
2.0 KiB
Go
105 lines
2.0 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
|
|
|
|
import (
|
|
"fmt"
|
|
"strings"
|
|
|
|
"serene-lang.org/bootstrap/pkg/ast"
|
|
)
|
|
|
|
/** WARNING:
|
|
This List implementation may look simple and performant but since
|
|
we're using a slice here. But in fact it's not memory effecient at
|
|
all. We need to rewrite this later to be a immutable and persistent
|
|
link list of cons.
|
|
*/
|
|
|
|
type List struct {
|
|
Node
|
|
exprs []IExpr
|
|
}
|
|
|
|
// Implementing IExpr for List ---
|
|
|
|
func (l *List) GetType() ast.NodeType {
|
|
return ast.List
|
|
}
|
|
|
|
func (l *List) String() string {
|
|
var strs []string
|
|
for _, e := range l.exprs {
|
|
strs = append(strs, e.String())
|
|
}
|
|
return fmt.Sprintf("(%s)", strings.Join(strs, " "))
|
|
}
|
|
|
|
func (l *List) ToDebugStr() string {
|
|
return fmt.Sprintf("%#v", l)
|
|
}
|
|
|
|
// END: IExpr ---
|
|
|
|
// Implementing ISeq for List ---
|
|
|
|
func (l *List) First() IExpr {
|
|
if l.Count() == 0 {
|
|
return Nil
|
|
}
|
|
return l.exprs[0]
|
|
}
|
|
|
|
func (l *List) Rest() ISeq {
|
|
if l.Count() < 2 {
|
|
return MakeEmptyList()
|
|
}
|
|
return MakeList(l.exprs[1:])
|
|
}
|
|
|
|
// END: ISeq ---
|
|
|
|
// Implementing ICountable for List ---
|
|
|
|
func (l *List) Count() int {
|
|
return len(l.exprs)
|
|
}
|
|
|
|
// END: ICountable ---
|
|
|
|
// Implementing IColl for List ---
|
|
|
|
func (l *List) ToSlice() []IExpr {
|
|
return l.exprs
|
|
}
|
|
|
|
// END: IColl ---
|
|
|
|
func MakeList(elements []IExpr) *List {
|
|
return &List{
|
|
exprs: elements,
|
|
}
|
|
}
|
|
|
|
func MakeEmptyList() *List {
|
|
return &List{
|
|
exprs: []IExpr{},
|
|
}
|
|
}
|