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bef.vim
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%y
new
let s:funbuf = winnr()
vnew
wincmd l
let s:outbuf = winnr()
exec s:funbuf . 'wincmd w'
fu! s:prout(prefix)
exec 'fu! s:' . a:prefix . s:outbuf . "wincmd w\nexec l:a\n" . s:funbuf . "wincmd w\nendfu"
endfu
setlocal cmdheight=4
0put
v/\_s*\S/d
normal! 26gg
if line('.') == 26
normal! dG
endif
while line('.') < 25
normal! o
endw
%s/^.*$/\= (submatch(0) . repeat(' ', 80-len(submatch(0))))[:79]
noh
res 25
vert res 90
normal! gg0
let b:stack = []
let b:data = {}
fu! s:e()
let b:x = b:x == 79 ? 0 : b:x + 1
endfu
fu! s:n()
let b:y = b:y == 0 ? 24 : b:y - 1
let b:curline = getline(b:y+1)
endfu
fu! s:w()
let b:x = b:x == 0 ? 79 : b:x - 1
endfu
fu! s:s()
let b:y = b:y == 24 ? 0 : b:y + 1
let b:curline = getline(b:y+1)
endfu
let b:dir = 's:e'
for b:x in range(10)
exec 'fu! s:l' . b:x . "()\ncall add(b:stack, " . b:x . ")\nendfu"
endfor
fu! s:east()
let b:dir='s:e'
endfu
fu! s:north()
let b:dir='s:n'
endfu
fu! s:west()
let b:dir='s:w'
endfu
fu! s:south()
let b:dir='s:s'
endfu
fu! s:hop()
call call(b:dir,[])
endfu
fu! s:dup()
if !empty(b:stack)
call add(b:stack, b:stack[-1])
endif
endfu
fu! s:pop()
if !empty(b:stack)
call remove(b:stack, -1)
endif
endfu
fu! s:wmem()
let l:a = empty(b:stack)?0:remove(b:stack, -1)
let l:b = empty(b:stack)?0:remove(b:stack, -1)
let l:c = empty(b:stack)?0:remove(b:stack, -1)
let b:data[l:a+l:b*25] = l:c
call cursor(l:a+1, l:b+1)
exec 'normal! r' . (l:c<33 || l:c>127 ? ' ' : nr2char(l:c))
if l:a == b:y
let b:curline = getline(b:y+1)
endif
endfu
fu! s:rmem()
let l:a = empty(b:stack)?0:remove(b:stack, -1)
let l:b = empty(b:stack)?0:remove(b:stack, -1)
let l:c = l:a+l:b*25
call add(b:stack, has_key(b:data, l:c) ? b:data[l:c] : char2nr(getline(l:a+1)[l:b]))
endfu
fu! s:add()
if len(b:stack) > 1
let b:stack[-1] += remove(b:stack, -1)
endif
endfu
fu! s:sub()
let l:a = empty(b:stack)?0:remove(b:stack, -1)
let l:b = empty(b:stack)?0:remove(b:stack, -1)
call add(b:stack, b-a)
endfu
fu! s:mul()
if len(b:stack) > 1
let b:stack[-1] = remove(b:stack, -1) * b:stack[-1]
elseif !empty(b:stack)
call remove(b:stack, -1)
endif
endfu
fu! s:div()
let l:a = empty(b:stack)?0:remove(b:stack, -1)
let l:b = empty(b:stack)?0:remove(b:stack, -1)
call add(b:stack, b/a)
endfu
fu! s:rem()
let l:a = empty(b:stack)?0:remove(b:stack, -1)
let l:b = empty(b:stack)?0:remove(b:stack, -1)
call add(b:stack, b%a)
endfu
fu! s:cmp()
if !empty(b:stack)
call add(b:stack, remove(b:stack, -1)<=(empty(b:stack)?0:remove(b:stack, -1)))
endif
endfu
fu! s:not()
if empty(b:stack)
call add(b:stack, 1)
else
let b:stack[-1]=!b:stack[-1]
endif
endfu
fu! s:str()
call call(b:dir,[])
while b:curline[b:x] != '"'
call add(b:stack, char2nr(b:curline[b:x]))
call call(b:dir,[])
endw
endfu
fu! s:vif()
let b:dir = !empty(b:stack) && remove(b:stack, -1) ? 's:n' : 's:s'
endfu
fu! s:hif()
let b:dir = !empty(b:stack) && remove(b:stack, -1) ? 's:w' : 's:e'
endfu
fu! s:swap()
let l:a = empty(b:stack)?0:remove(b:stack, -1)
let l:b = empty(b:stack)?0:remove(b:stack, -1)
call add(b:stack, l:a)
call add(b:stack, l:b)
endfu
fu! s:rng()
let b:dir = ['s:n', 's:s', 's:w', 's:e'][reltime()[1]%4]
endfu
call s:prout("prnm()\nlet l:a='normal! GA'.(empty(b:stack)?0:remove(b:stack,-1)).' '\n")
call s:prout("prch()\nlet l:a=empty(b:stack)?0:remove(b:stack,-1)\nlet l:a=l:a==10?'normal! Go':l:a<33||l:a>126?'normal! GA ':'normal! GA' . nr2char(l:a)\n")
fu! s:getnm()
call add(b:stack, input('')+0)
endfu
fu! s:getch()
call add(b:stack, char2nr(getchar()))
endfu
fu! s:done()
return 1
endfu
fu! s:befprequel()
let b:x = col('.')-1
let b:y = line('.')-1
let b:curline = getline(b:y+1)
endfu
fu! BefungeStep()
call s:befprequel()
while !has_key(s:ops, b:curline[b:x])
call call(b:dir,[])
endw
if !call(s:ops[b:curline[b:x]],[])
call call(b:dir,[])
endif
call cursor(b:y+1, b:x+1)
return b:curline[b:x]
endfu
fu! BefungeJog()
while BefungeStep() != '@'
redr
endw
endfu
fu! BefungeRun()
call s:befprequel()
while !(has_key(s:ops, b:curline[b:x]) && call(s:ops[b:curline[b:x]],[]))
call call(b:dir,[])
endw
return cursor(b:y+1, b:x+1)
endfu
fu! BefungeQuit()
exec s:funbuf . "wincmd c\n" . s:outbuf . 'wincmd c'
endfu
let s:ops = {0:'s:l0',1:'s:l1',2:'s:l2',3:'s:l3',4:'s:l4',5:'s:l5',6:'s:l6',7:'s:l7',8:'s:l8',9:'s:l9',
\'>':'s:east','^':'s:north','<':'s:west','v':'s:south','#':'s:hop',':':'s:dup','$':'s:pop','p':'s:wmem','g':'s:rmem',
\'+':'s:add','-':'s:sub','*':'s:mul','/':'s:div','%':'s:rem','`':'s:cmp','!':'s:not','"':'s:str',
\'|':'s:vif','_':'s:hif','\':'s:swap','?':'s:rng','.':'s:prnm',',':'s:prch','&':'s:getnm','~':'s:getch','@':'s:done'}
nnoremap <silent> <buffer> <F5> :call BefungeRun()<cr>
nnoremap <silent> <buffer> <F6> :call BefungeJog()<cr>
nnoremap <silent> <buffer> <F7> :echo b:stack<cr>
nnoremap <silent> <buffer> <F8> :echo b:data<cr>
nnoremap <silent> <buffer> <F10> :call BefungeStep()<cr>
nnoremap <silent> <buffer> Quit :call BefungeQuit()<cr>
setlocal colorcolumn=80
setlocal cursorcolumn
setlocal nu
syn match befungeNumber '\d'
syn match befungeOperator '[+\-*/%`!:$\\,.~&pg]'
syn match befungeMovement '[<v>^#]'
syn match befungeLogic '[_|@"?]'
syn match befungeOther '[^0-9+\-*/%`\\!:$,.~&pg>v<^#_|@"?]'
hi def link befungeNumber Number
hi def link befungeOperator Operator
hi def link befungeMovement Identifier
hi def link befungeLogic Keyword
hi def link befungeOther Comment