beer.idel

idel虚拟机源码

def 0 1 beer   23 drinking  0 ;

#include "udot.idel"
#include "type.idel"

def 0 0 cr   '\n' emit ;


string: no-more  "No more bottles"
string: 1-bottle "1 bottle"
string: bottles  " bottles"

def 1 0 .how-many
  { bottles --       bottles 0 = if  no-more.addr no-more.size
                else bottles 1 = if  1-bottle.addr 1-bottle.size
                else                 bottles u.  bottles.addr bottles.size
                then then            type } ;

string: of-beer " of beer"

def 1 0 .bottles   .how-many  of-beer.addr of-beer.size type ;

string: on-the-wall  " on the wall,"
string: goto-store   "Go to the store, and buy some more!"
string: on-the-wall. " on the wall."
string: if-fall      "If one of those bottles should happen to fall,"

def 1 0 drinking
  { bottles --
      bottles .bottles  on-the-wall.addr on-the-wall.size type cr
      bottles .bottles  '!' emit cr
      bottles 0 = if
	goto-store.addr goto-store.size type cr
	23 .bottles  on-the-wall..addr on-the-wall..size type cr
      else
	if-fall.addr if-fall.size type cr
	bottles 1 - .bottles  on-the-wall..addr on-the-wall..size type cr
	cr
	bottles 1 - drinking 
      then } ;