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#6059

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
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Nikolaj Bjorner 2022-05-30 11:03:50 -07:00
parent da3f31697b
commit 15c47808d6
3 changed files with 120 additions and 0 deletions
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21
src/api/python/z3/z3.py
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@ -8803,6 +8803,27 @@ def substitute_vars(t, *m):
_to[i] = m[i].as_ast()
return _to_expr_ref(Z3_substitute_vars(t.ctx.ref(), t.as_ast(), num, _to), t.ctx)
def substitute_funs(t, *m):
"""Apply subistitution m on t, m is a list of pairs of a function and expression (from, to)
Every occurrence in to of the function from is replaced with the expression to.
The expression to can have free variables, that refer to the arguments of from.
For examples, see
"""
if isinstance(m, tuple):
m1 = _get_args(m)
if isinstance(m1, list) and all(isinstance(p, tuple) for p in m1):
m = m1
if z3_debug():
_z3_assert(is_expr(t), "Z3 expression expected")
_z3_assert(all([isinstance(p, tuple) and is_func_decl(p[0]) and is_expr(p[1]) for p in m]), "Z3 invalid substitution, funcion pairs expected.")
num = len(m)
_from = (FuncDecl * num)()
_to = (Ast * num)()
for i in range(num):
_from[i] = m[i][0].as_func_decl()
_to[i] = m[i][1].as_ast()
return _to_expr_ref(Z3_substitute_funs(t.ctx.ref(), t.as_ast(), num, _from, _to), t.ctx)
def Sum(*args):
"""Create the sum of the Z3 expressions.