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A rudimentary interpreter for a stack-based language with Piet-like commands.
#72, 101, 108, 108, 111, 44, 32, 87, 111, 114, 108, 100, 33
nop
push 3
dup
add
dup
mul
dup
dup
add
putc
push 3
sub
dup
push 3
mul
push 1
add
dup
push 1
add
putc
dup
push 4
dup
add
add
dup
putc
dup
putc
dup
push 3
add
dup
putc
dup
dup
push 5
div
dup
add
dup
putc
dup
add
push 4
dup
mul
dup
add
putc
push 1
sub
putc
putc
push 3
add
putc
putc
putc
putc
from sys import argv, stdout
with open(argv[1], 'r') as prog:
cmds = prog.readlines()
colors = ['red', 'ylw', 'grn', 'cyn', 'blu', 'mgn']
hue = 4
dark = 1
stack = []
codels = 0
for cmd in cmds:
terms = cmd.split()
if len(terms) == 0: continue
if terms[0] == 'add':
if len(stack) > 1:
a, b = stack.pop(), stack.pop()
stack.append(b+a)
codels += 1
hue = (hue+1)%6
elif terms[0] == 'sub':
if len(stack) > 1:
a, b = stack.pop(), stack.pop()
stack.append(b-a)
codels += 1
hue = (hue+1)%6
dark = (dark+1)%3
elif terms[0] == 'mul':
if len(stack) > 1:
a, b = stack.pop(), stack.pop()
stack.append(b*a)
codels += 1
hue = (hue+1)%6
dark = (dark+2)%3
elif terms[0] == 'div':
if len(stack) > 1:
a, b = stack.pop(), stack.pop()
stack.append(b//a)
codels += 1
hue = (hue+2)%6
elif terms[0] == 'mod':
if len(stack) > 1:
a, b = stack.pop(), stack.pop()
stack.append(b%a)
codels += 1
hue = (hue+2)%6
dark = (dark+1)%3
elif terms[0] == 'dup':
if stack:
stack.append(stack[-1])
codels += 1
hue = (hue+4)%6
elif terms[0] == 'push':
stack.append(int(terms[1]))
codels += int(terms[1])
dark = (dark+1)%3
elif terms[0] == 'pop':
if stack:
stack.pop()
codels += 1
dark = (dark+2)%3
elif terms[0] == 'putc':
if stack:
a = stack.pop()
stdout.write(chr(a))
codels += 1
hue = (hue+5)%6
dark = (dark+2)%3
elif terms[0] == 'roll':
if len(stack) > 1:
a, b = stack.pop(), stack.pop()
while a:
t = stack.pop(-b)
stack += [t]
a -= 1
codels += 1
hue = (hue+4)%6
dark = (dark+1)%3
elif terms[0] == 'rot':
if stack:
stack.pop()
codels += 1
hue = (hue+3)%6
dark = (dark+1)%3
elif terms[0] == 'swit':
if stack:
stack.pop()
codels += 1
hue = (hue+3)%6
dark = (dark+2)%3
elif terms[0] == 'nop':
codels += 1
elif terms[0] == 'end':
break
else:
continue
print("\t%3d %-6s\t%s%d %s"%(codels, cmd.strip(), colors[hue], dark, stack))
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