def findAllWays(f):
v = bdd.expr("0")
v = bdd.expr2bdd(v)
for i in f.satisfy_all():
s = bdd.expr("1")
s = bdd.expr2bdd(s)
for a in i.items():
if (a[1] == 1):
s = s & a[0]
else:
s = s & ~a[0]
v = v | s
return v
def generate_bdd(comparison: list, expressions: list) -> list:
'''
Method that converts given expressions into BDD for a given R.
Parameter list: comparison list and expression list.
returns: BDD as list for a given R.
'''
R = comparison
for expr in expressions:
R = R or expr2bdd(expr(expr))
return R
def EquivalentCheckFromFile(path1, path2):
answ1 = exe.Execution(path1)
answ2 = exe.Execution(path2)
prs = parser.Parser(path1)
for name in prs.varNames("output"):
r1 = bdd.expr2bdd(answ1[name][0])
r3 = bdd.expr2bdd(answ2[name][0])
f1 = findAllWays(~r1) & findAllWays(r3)
if (~f1.is_zero()):
return f1
r2 = bdd.expr2bdd(answ1[name][1])
r4 = bdd.expr2bdd(answ2[name][1])
f2 = findAllWays(~r1) & findAllWays(r2) & findAllWays(
~r3) & findAllWays(~r4)
if (~f2.is_zero()):
return f2
f3 = findAllWays(~r1) & findAllWays(~r2) & findAllWays(
~r3) & findAllWays(r4)
if (~f3.is_zero()):
return f3
f = bdd.expr("0")
return f
def EquivalentCheck(out1, out2, inV):
r1 = out1[0]
r2 = out1[1]
r3 = out2[0]
r4 = out2[1]
f1 = findAllWays(~r1) & findAllWays(r3)
f2 = findAllWays(~r1) & findAllWays(r2) & findAllWays(~r3) & findAllWays(
~r4)
f3 = findAllWays(~r1) & findAllWays(~r2) & findAllWays(~r3) & findAllWays(
r4)
f = f1 | f2 | f3
f = bdd.expr2bdd(f)
return f
def text2bddExpr(text):
formula = expr2bdd(expr(text))
print(expr(text))
gv = Source(formula.to_dot())
file_path = "selfGeneratedDot.dot"
gv.render(filename=file_path, format='png', view=False)
return file_path
# text2bddExpr("Or(a,b,c)")
# get_dot_from_json("delete_this.json", "delete_this.dot")
#text2bddExpr("a|b&c")
# render("dot", "png", "delete_this.dot")
# render("delete_this.dot", format='png')
def main():
edgeFormulaList = []
x0, x1, x2, x3, x4 = pyeda.bddvars('x', 5)
y0, y1, y2, y3, y4 = pyeda.bddvars('y', 5)
print("Generating Graph...")
for i in range(0, 32):
for j in range(0,32):
if (((i+3) % 32) == (j % 32)) | (((i+7) % 32) == (j % 32)):
newFormula = conjure_formula(i, j)
edgeFormulaList.append(newFormula)
F = connect_to_edges(edgeFormulaList)
R = pyeda.expr2bdd(F)
print("Generating transitive closure, R*")
RStar = transitive_closure(R)
print("Negating the transitive closure, R*")
negRStar = ~RStar
result = negRStar.smoothing((x0, x1, x2, x3, x4, y0, y1, y2, y3, y4))
result = ~result
print("Let x,y be in the set S. Node x can reach node y in one+ steps in a graph G. . .")
print(f"\n{result.equivalent(True)}\n")
#!/usr/bin/env python3
from pyeda.inter import expr, expr2bdd, bddvar
# type
# expr.Variable
# expr.OrOp
#
# bdd.BDDVariable
# bdd.BinaryDecisionDiagram
#
# expr() => expr.*
# expr2bdd() => from expr to bdd
# bddvar() => bdd.BDDVariable
#
# both expr and bdd can use ~|&^ operator
# f = expr('a & b | b & c | c & a')
f = expr('a1_1 & a2_1 | a2_1 & a2_2 | a2_2 & a1_1')
g = f | expr('d')
# type(f) => expr
# type(g) => expr
f2 = expr2bdd(f)
# type(f2) = bdd
print(f2.satisfy_one())
print(f2.satisfy_all()) # generator
print(list(f2.satisfy_all()))
print(f2.satisfy_count())
print(f2.to_dot())
bdds_together = join_disjunct(bdds)
print("bdds_together: long string bdd for entire equation")
pprint(bdds_together)
# step 4'
printHeader("Step 4'")
x_names = names[0:5]
p_bdds = join_disjunct(
map(lambda x: transformEdge(x, x_names), map(lambda x: getBin(x, 5),
primes)))
p = expr2bdd(expr(p_bdds))
y_names = names[5:-1]
e_bdds = join_disjunct(
map(lambda y: transformEdge(y, y_names), map(lambda y: getBin(y, 5),
evens)))
e = expr2bdd(expr(e_bdds))
print("p_bdds: like bdds_together")
pprint(p_bdds)
print("e_bdds: like bdds_together")
pprint(e_bdds)
# step 5
printHeader("Step 5")
def boolX():
f = bdd.expr("1")
f = bdd.expr2bdd(f)
g = bdd.expr("0")
g = bdd.expr2bdd(g)
return (f, g)
def boolZero():
f = bdd.expr("0")
f = bdd.expr2bdd(f)
g = bdd.expr("0")
g = bdd.expr2bdd(g)
return (f, g)
print("Joining edges for boolean expressions...")
rForms = joinEdgeList(rList)
pForms = joinEdgeList(pList)
eForms = joinEdgeList(eList)
debug(rForms)
if (render_graph):
print("Attempting to render graph from R formula...")
try:
renderGraph(rForms)
except:
print("Failed to render graph :(")
print("Converting boolean functions into BDDs RR, PP, and EE")
RR = pyeda.expr2bdd(rForms)
PP = pyeda.expr2bdd(pForms)
EE = pyeda.expr2bdd(eForms)
debug(RR)
print("Computing BDD RR2 from BDD RR")
RR2 = RR.compose({
j0: k0,
j1: k1,
j2: k2,
j3: k3,
j4: k4
}) & RR.compose({
i0: k0,
i1: k1,
i2: k2,
# send the edge to to formula creation function
newFormula = edgeToBooleanFormula(i, j)
# add the formula to the list
edgeFormulaList.append(newFormula)
print("Done")
# Create a big boolean expression, F, for the entire graph G
print("Building the boolean expression, F, from the graph G..")
F = joinEdgeFormulaList(edgeFormulaList)
print("Done")
# Convert F into BDD: R
print("Converting F to a BDD, R..")
R = pyeda.expr2bdd(F)
print("Done")
# Compute the transitive closure R*
print("Computing the transitive closure, R*..")
RStar = computeTransitiveClosure(R)
print("Done")
# for all i, j ∈ S, node i can reach node j in one or more steps in G
# first we negate R*
print("Negating the transitive closure, R*..")
negRStar = ~RStar
print("Done")
# Then apply smoothing over all BDD vars
print("Smoothing over all x[0]..x[4] and y[0]..y[4]")