litex/litescope/host/truthtable.py

48 lines
949 B
Python
Raw Normal View History

2012-08-26 09:15:44 -04:00
import os
import re
import sys
2012-09-17 11:27:50 -04:00
def is_number(x):
2014-08-03 02:38:37 -04:00
try:
_ = float(x)
except ValueError:
return False
return True
2012-09-17 11:27:50 -04:00
def remove_numbers(seq):
2014-08-03 02:38:37 -04:00
return [x for x in seq if not is_number(x)]
2012-09-17 11:27:50 -04:00
def remove_duplicates(seq):
2012-09-17 11:27:50 -04:00
seen = set()
seen_add = seen.add
2014-08-03 02:38:37 -04:00
return [x for x in seq if x not in seen and not seen_add(x)]
2012-08-26 09:15:44 -04:00
def get_operands(s):
2012-09-17 11:27:50 -04:00
operands = re.findall("[A-z0-9_]+", s)
operands = remove_duplicates(operands)
operands = remove_numbers(operands)
return sorted(operands)
2012-08-26 09:15:44 -04:00
def gen_truth_table(s):
operands = get_operands(s)
width = len(operands)
stim = []
for i in range(width):
stim_op = []
for j in range(2**width):
stim_op.append((int(j/(2**i)))%2)
stim.append(stim_op)
truth_table = []
for i in range(2**width):
for j in range(width):
exec("%s = stim[j][i]" %operands[j])
truth_table.append(eval(s) != 0)
2012-08-26 09:15:44 -04:00
return truth_table
def main():
print(gen_truth_table("(A&B&C)|D"))
2012-09-17 11:27:50 -04:00
2012-08-26 09:15:44 -04:00
if __name__ == '__main__':
2012-09-17 11:27:50 -04:00
main()