#概要
インタープリタを作ってみた。
pythonで俺言語インタープリター書いてみた。
#俺言語の仕様
行番号、スペース、ステートメントの順
代入文しか無い。
数値は、０から２５５
行番号なしで、ダイレクト実行
行番号は、１から２５５
メモリは２５６バイト
ラインエディタあり。
演算子は、+, -, /, *, %の5個
変数は、a,b,cの三個
| コマンド | 意味 |
|---|---|
| 0 | ソース表示 |
| &=0 | 全行削除 |
| 30 | 行３０が消える |
| a=9 | 変数aに９を代入 |
| ?=$ | 乱数表示 |
| #=1 | 行番号１から実行 |
| ?="ok" | OK表示 |
| #=120 | １２０行へジャンプ |
| #=a<10*120 | 条件分岐、もし a<10 ならば 120行へジャンプ |
| a=2+3*5 | (2+3)*5で２５が変数aへ代入。 |
| ?=! | 改行 |
#九九のソースと実行結果
>0
10 a=1
20 b=1
30 ?=a*b
60 a=a+1
70 #=a<10*30
90 b=b+1
95 ?=!
100 a=1
110 #=b<10*30
120 #=120
>#=1
1 2 3 4 5 6 7 8 9
2 4 6 8 10 12 14 16 18
3 6 9 12 15 18 21 24 27
4 8 12 16 20 24 28 32 36
5 10 15 20 25 30 35 40 45
6 12 18 24 30 36 42 48 54
7 14 21 28 35 42 49 56 63
8 16 24 32 40 48 56 64 72
9 18 27 36 45 54 63 72 81
>
#サンプルコード
import random
Ram = []
Rmd = 233
Bnd = 234
PC = 235
Lbf = 237
Ptr = 0
Cur = 0
C = 0
Adr = 0
Adr2 = 0
Val = 0
def WRITEB(adr, data):
global Ram
Ram[adr] = data
def READB(adr):
global Ram
v = Ram[adr]
return v
def put(b):
print(b, end = " ")
def putchar(b):
c = chr(b)
print(c, end = "")
def crlf():
print()
def putl(pt, d):
while READB(pt) != d:
putchar(READB(pt))
pt = pt + 1
return pt
def putlp(d):
global Ptr
while READB(Ptr) != d:
putchar(READB(Ptr))
Ptr = Ptr + 1
def term():
global Ptr, Rmd, Val
cc = READB(Ptr)
val2 = Val
Ptr = Ptr + 1
factr()
if cc == ord('*'):
Val = val2 * Val
elif cc == ord('+'):
Val = val2 + Val
elif cc == ord('-'):
Val = val2 - Val
elif cc == ord('/'):
Val = val2 / Val
elif cc == ord('%'):
Val = val2 % Val
elif cc == ord('='):
if (val2 == Val):
Val = 1
else:
Val = 0
elif cc == ord('>'):
if (val2 >= Val):
Val = 1
else:
Val = 0
else:
if (val2 < Val):
Val = 1
else:
Val = 0
def getvr2():
global Ptr, Adr2, PC, Rmd
cc = READB(Ptr)
if cc == ord('a'):
Adr2 = 230
elif cc == ord('#'):
Adr2 = PC
elif cc == ord('&'):
Adr2 = Bnd
elif cc == ord('b'):
Adr2 = 231
elif cc == ord('c'):
Adr2 = 232
else:
Adr2 = 230
def factr():
global Ptr, Val, Adr2
if READB(Ptr) == ord('\0'):
Val = 0
return
if getnm():
return
cc = READB(Ptr)
if cc == ord('$'):
r = random.random()
Val = int(r * 10)
Ptr = Ptr + 1
else:
getvr2()
Val = READB(Adr2)
Ptr = Ptr + 1
def expr():
global Ptr
factr()
cc = READB(Ptr)
while cc != ord('\0'):
term()
cc = READB(Ptr)
Ptr = Ptr + 1
def getvr():
global Ptr, Adr, PC, Rmd, C
C = READB(Ptr)
if C == ord('a'):
Adr = 230
elif C == ord('#'):
Adr = PC
elif C == ord('&'):
Adr = Bnd
elif C == ord('b'):
Adr = 231
elif C == ord('c'):
Adr = 232
else:
Adr = 230
def ordr():
global Ptr, Val, C, Adr
getvr()
Ptr = Ptr + 2
if READB(Ptr) == ord('"'):
Ptr = Ptr + 1
putlp(ord('"'))
elif READB(Ptr) == ord('!'):
print()
else:
expr()
if C == ord('?'):
put(Val)
else:
WRITEB(Adr, Val)
def nxtln(pt):
while READB(pt) != ord('\0'):
pt = pt + 1
pt = pt + 1
return pt
def nxline():
global Bnd, PC, Cur
Cur = 0
while Cur != READB(Bnd):
if READB(Cur) > READB(PC):
return True
Cur = nxtln(Cur)
return False
def fndln():
global Bnd, PC, Cur
Cur = 0
while Cur != READB(Bnd):
if READB(Cur) == READB(PC):
return True
Cur = nxtln(Cur)
return False
def num():
global Ptr
if (48 <= READB(Ptr)) and (READB(Ptr) <= 57):
return True
else:
return False
def getnm():
global Ptr, Val
if not(num()):
return False
n = 0
while (num()):
n *= 10
ch = READB(Ptr)
Ptr = Ptr + 1
n += (ch - 48)
Val = n
return True
def run():
global Bnd, Ptr, Lbf, Cur, PC
while True:
#for i in range(10):
# print(Ram[i])
str = input("\n>")
Ptr = Lbf
for j in str:
WRITEB(Ptr, ord(j))
Ptr = Ptr + 1
WRITEB(Ptr, ord('\0'))
ima = 0
Ptr = Lbf
if not(getnm()):
while True:#run
ima = READB(PC)
ordr()
if READB(PC) == 0 and ima == 0:
break
else:
if READB(PC) == 0:
WRITEB(PC, ima)
if READB(PC) == 1:
ima = 1
if READB(PC) == ima:
if nxline():
WRITEB(PC, READB(Cur))
Ptr = Cur + 2
else:
break
else:
if fndln():
WRITEB(PC, READB(Cur))
Ptr = Cur + 2
else:
break
else:
if Val == 0:#list
pt = 0
while pt < READB(Bnd):
put(READB(pt))
pt = pt + 1
pt = putl(pt, ord('\0'))
crlf()
pt = pt + 1
else:
f = 0
WRITEB(PC, Val)
if fndln():#del
src = nxtln(Cur)
dst = Cur
while src != READB(Bnd):
WRITEB(dst, READB(src))
dst = dst + 1
src = src + 1
WRITEB(Bnd, dst)
if nxline():
f = 1
src = READB(Bnd)
m = 2
h = Ptr
while READB(h) != ord('\0'):
m = m + 1
h = h + 1
if m > 2:
WRITEB(Bnd, (src + m))
if f == 1:#insert
dst = READB(Bnd)
while src != Cur:
WRITEB(dst, READB(src))
dst = dst - 1
src = src - 1
WRITEB(dst, READB(src))
src = Cur
WRITEB(src, Val)#append
src = src + 1
for k in range(m - 1):
WRITEB(src, READB(Ptr))
Ptr = Ptr + 1
src = src + 1
for i in range(256):
Ram.append(0)
WRITEB(Bnd, 0)
print("ore v0.9")
run()
以上。