mirror of
https://github.com/ValKmjolnir/Nasal-Interpreter.git
synced 2026-07-22 02:48:48 +08:00
ValKmjolnir
67 lines
1.5 KiB
Plaintext
67 lines
1.5 KiB
Plaintext
# lib list.nas
|
|
# valkmjolnir 2021/3/31
|
|
var list=func()
|
|
{
|
|
var _={begin:nil,end:nil};
|
|
return
|
|
{
|
|
push_back:func(elem)
|
|
{
|
|
var tmp={elem:elem,prev:nil,next:nil};
|
|
if(_.end!=nil)
|
|
{
|
|
_.end.next=tmp;
|
|
tmp.prev=_.end;
|
|
_.end=tmp;
|
|
}
|
|
else
|
|
_.begin=_.end=tmp;
|
|
return;
|
|
},
|
|
push_front:func(elem)
|
|
{
|
|
var tmp={elem:elem,prev:nil,next:nil};
|
|
if(_.begin!=nil)
|
|
{
|
|
_.begin.prev=tmp;
|
|
tmp.next=_.begin;
|
|
_.begin=tmp;
|
|
}
|
|
else
|
|
_.begin=_.end=tmp;
|
|
return;
|
|
},
|
|
pop_back:func()
|
|
{
|
|
if(_.end!=nil)
|
|
_.end=_.end.prev;
|
|
if(_.end==nil)
|
|
_.begin=nil;
|
|
else
|
|
_.end.next=nil;
|
|
return;
|
|
},
|
|
pop_front:func()
|
|
{
|
|
if(_.begin!=nil)
|
|
_.begin=_.begin.next;
|
|
if(_.begin==nil)
|
|
_.end=nil;
|
|
else
|
|
_.begin.prev=nil;
|
|
return;
|
|
},
|
|
front:func()
|
|
{
|
|
if(_.begin!=nil)
|
|
return _.begin.elem;
|
|
return nil;
|
|
},
|
|
back:func()
|
|
{
|
|
if(_.end!=nil)
|
|
return _.end.elem;
|
|
return nil;
|
|
},
|
|
};
|
|
} |