[特效代码] 批处理贪吃蛇代码求解释 ！！另我想把它改成自动输入

mode con cols=135 lines=18 &title made by 523066680 -- If_Exist
echo,p>x
for %%a in (w a s d p q) do (set de%%a=d)
set _w=s
set _s=w
set _a=d
set _d=a
:a
cls
set /p input="w a s d q(退出) r(重来) p(暂停):"
set input=%input:~0,1%
if not defined de%input% (goto :a)
if "%input%"=="%ever%" (goto :a)
if "%input%"=="q" (echo,q>x &exit)
if "%input%"=="r" (echo,r>x)
call,set ever=%%_%input%%%
echo %input%>x
goto :a
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@echo off
start direction.bat
title made by hi.baidu.com/523066680
:action
color 07
setlocal enabledelayedexpansion
mode con cols=65 lines=35
for /l %%a in (1,1,60) do (set space= !space!)
for /l %%a in (1,1,30) do (set L%%a=%space%)
set /a line=15,col=29,i=0,long=9
:loop
:::::控制蛇长，判断是否建立食物部分(set /a i+=1)
if %i% lss %long% (set /a i=1) else (set i=1)
if defined cut%i% (
    if not defined dot (call :dot)
    !cut%i%:"=!
    set "L%a%=!L%a%:~0,%b%! !L%a%:~%c%!"
    set "%a%_%b%="
)
:pausego
    :::::显示
    cls
    echo, %space: =_%__
    for /l %%a in (1,1,30) do echo,│!L%%a!│
    echo, %space: =-%--
    echo,- 分数:%fen%00  %echo%
    for /l %%a in (1,1,2) do (ping -n 1 127.0>nul)
::::::读取数据，分析部分
:typex
set /p way=<x
if %way%==q (exit)
if %way%==r (endlocal &set echo=按wasd方向键激活。&goto :action) else (set echo=)
if %way%==p (ping -n 2 127.0>nul &set echo=按wasd方向键激活。&goto :pausego) else (set echo=)
if %way%==w (set /a line-=1)
if %way%==s (set /a line+=1)
if %way%==a (set /a col-=1)
if %way%==d (set /a col+=1)
    if defined %line%_%col% (goto :gameover)
    if %line% equ 31 (goto :gameover) 
    if %line% equ 0 (goto :gameover) 
    if %col% equ -1 (goto :gameover) 
    if %col% equ 60 (goto :gameover)
::::::句2描点,3记录点坐标并加以编号,4定义该点是存在的,5判断吃到食物否.
set /a C2=col+1
set "L%line%=!L%line%:~0,%col%!*!L%line%:~%C2%!"
set cut%i%="set /a a=%line%,b=%col%,c=%C2%"
set "%line%_%col%=exist"
if "%line%_%col%"=="%dotl%_%dotc%" (set /a long+=3,fen+=1 &set dot=)
goto :loop
  ::::::建立食物O的调用部分
  :dot
  set /a dotl=%random%%%28+2,dotc=%random%%%58+1
  if defined %dotl%_%dotc% (goto :dot)
  set dot=%dotl%_%dotc%
  set /a dotc2=dotc+1
  set "L%dotl%=!L%dotl%:~0,%dotc%!0!L%dotl%:~%dotc2%!"
  goto :eof
:gameover
echo,p>x
color 0a
ping -n 2 127.0>nul &cls
echo,game over 在控制台按q结束游戏,r再玩一次,然后按任意方向键激活暂停状态
ping -n 3 127.0>nul
endlocal
goto :action
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