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Fix for FP numeral construction in the Python API. Fixes #386.

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This commit is contained in:
Christoph M. Wintersteiger 2015-12-29 15:59:14 +00:00
parent 077e801590
commit b0781a14cd
1 changed files with 24 additions and 10 deletions
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34
src/api/python/z3.py
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@ -8315,20 +8315,36 @@ def FPSort(ebits, sbits, ctx=None):
ctx = z3._get_ctx(ctx)
return FPSortRef(Z3_mk_fpa_sort(ctx.ref(), ebits, sbits), ctx)
def _to_float_str(val):
def _to_float_str(val, exp=0):
if isinstance(val, float):
return str(val)
v = val.as_integer_ratio()
num = v[0]
den = v[1]
rvs = str(num) + '/' + str(den)
res = rvs + 'p' +_to_int_str(exp)
elif isinstance(val, bool):
if val:
return "1.0"
res = "1.0"
else:
return "0.0"
res = "0.0"
elif _is_int(val):
return str(val)
res = str(val)
elif isinstance(val, str):
return val
if __debug__:
_z3_assert(False, "Python value cannot be used as a double")
inx = val.find('*(2**')
if inx == -1:
res = val
elif val[-1] == ')':
res = val[0:inx]
exp = str(int(val[inx+5:-1]) + int(exp))
else:
_z3_assert(False, "String does not have floating-point numeral form.")
elif __debug__:
_z3_assert(False, "Python value cannot be used to create floating-point numerals.")
if exp == 0:
return res
else:
return res + 'p' + exp
def fpNaN(s):
_z3_assert(isinstance(s, FPSortRef), "sort mismatch")
@ -8385,8 +8401,6 @@ def FPVal(sig, exp=None, fps=None, ctx=None):
if exp == None:
exp = 0
val = _to_float_str(sig)
val = val + 'p'
val = val + _to_int_str(exp)
return FPNumRef(Z3_mk_numeral(ctx.ref(), val, fps.ast), ctx)
def FP(name, fpsort, ctx=None):