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Beam interpreter in Pyhton
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#!/usr/bin/python | |
import sys | |
if(len(sys.argv) < 5): | |
print 'Usage: ./beam.py path <debug> <debugpoints> <memsize>' | |
print ' debug: on or off' | |
print ' debugpoints: ;-seperated list of coordinates (e.g. 0,9;0,2)' | |
print ' (use -1,-1 for none)' | |
print ' memsize: how many memory cells' | |
sys.exit(-3) | |
debug = False | |
cycles = 0 | |
bps = sys.argv[3].split(';') | |
bps = map(lambda a: a.split(','),bps) | |
bps = map(lambda ds: (int(ds[0]),int(ds[1])),bps) | |
memsize = int(sys.argv[4]) | |
if(sys.argv[2] == 'on'): | |
debug = True | |
elif(sys.argv[2] == 'off'): | |
debug = False | |
else: | |
print 'Unknown option: ' + sys.argv[2] | |
sys.exit(-2) | |
fpath = sys.argv[1] | |
fhandle = open(fpath, 'r') | |
fcontents = fhandle.read() | |
lines = fcontents.splitlines() | |
chars = map(list,lines) | |
x = 0 | |
y = 0 | |
h = len(lines) | |
xd = 1 | |
yd = 0 | |
beam = 0 | |
store = 0 | |
memory = [0] * memsize | |
while True: | |
cycles += 1 | |
if y < 0 or y >= h: | |
sys.stderr.write("y out of bounds: " + str(x) + "," + str(y) + "\n") | |
sys.exit(-1) | |
w = len(lines[y]) | |
if x < 0 or x >= w: | |
sys.stderr.write("x out of bounds: " + str(x) + "," + str(y) + "\n") | |
sys.exit(-2) | |
if((x,y) in bps): | |
print '== DEBUGPOINT ==' | |
print 'Beam := %d, Store := %d' % (beam, store) | |
print 'Cycles := %d' % (cycles) | |
print 'C := %s' % (lines[y][x]) | |
print ' ** MEMORY **' | |
print memory | |
c = lines[y][x] | |
if(debug): print '%d,%d: %s ; %d,%d' % (x,y,c,beam,store) | |
if(c == 'H'): | |
break | |
elif(c == '>'): | |
xd = 1; yd = 0 | |
elif(c == '<'): | |
xd = -1; yd = 0 | |
elif(c == '^'): | |
yd = -1; xd = 0 | |
elif(c == 'v'): | |
yd = 1; xd = 0 | |
elif(c == '+'): | |
beam += 1 | |
if(beam >= 256): beam = 0 | |
elif(c == '-'): | |
beam -= 1 | |
if(beam < 0): beam = 255 | |
elif(c == '@'): | |
sys.stdout.write(chr(beam)) | |
elif(c == ':'): | |
sys.stdout.write(str(beam)) | |
elif(c == '/'): | |
if(xd == -1): | |
yd = 1; xd = 0; | |
elif(yd == -1): | |
xd = 1; yd = 0; | |
elif(xd == 1): | |
yd = -1; xd = 0; | |
elif(yd == 1): | |
xd = -1; yd = 0; | |
elif(c == '\\'): | |
if(xd == 1): | |
yd = 1; xd = 0; | |
elif(yd == -1): | |
xd = -1; yd = 0; | |
elif(yd == 1): | |
xd = 1; yd = 0; | |
elif(xd == -1): | |
yd = -1; xd = 0 | |
elif(c == '!'): | |
if(beam != 0): | |
xd *= -1 | |
yd *= -1 | |
elif(c == '?'): | |
if(beam == 0): | |
xd *= -1 | |
yd *= -1 | |
elif(c == '|'): | |
if(yd == 0): | |
xd *= -1; yd = 0 | |
elif(c == '_'): | |
if(xd == 0): | |
yd *= -1; xd = 0 | |
elif(c == 'S'): | |
store = beam | |
elif(c == 'L'): | |
beam = store | |
beam %= 256 | |
elif(c == 's'): | |
memory[beam] = store % 256 | |
elif(c == 'g'): | |
store = memory[beam] | |
elif(c == 'P'): | |
memory[store] = beam | |
elif(c == 'p'): | |
beam = memory[store] | |
elif(c == 'u'): | |
if(beam != store): | |
yd = -1; xd = 0; | |
elif(c == 'n'): | |
if(beam != store): | |
yd = 1; xd = 0; | |
elif(c == '`'): | |
store -= 1 | |
if(store < 0): store = 255 | |
elif(c == '\''): | |
store += 1 | |
elif(c == ')'): | |
if(store != 0): xd = -1; yd = 0; | |
elif(c == '('): | |
if(store != 0): xd = 1; yd = 0; | |
elif(c == 'r'): | |
s = sys.stdin.read(1) | |
if(len(s) != 0): | |
beam = ord(s) | |
else: | |
beam = 0 | |
x += xd | |
y += yd | |
print "" | |
print "" | |
print "Took %d cycles." % (cycles) |
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However, line
should be
beam = 255
. I'll fix it.fixed