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526 lines
20 KiB
526 lines
20 KiB
import contextlib
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import itertools
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import re
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import typing
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from enum import Enum
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from typing import Callable
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import sympy
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from sympy import Add, Implies, sqrt
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from sympy.core import Mul, Pow
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from sympy.core import (S, pi, symbols, Function, Rational, Integer,
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Symbol, Eq, Ne, Le, Lt, Gt, Ge)
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from sympy.functions import Piecewise, exp, sin, cos
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from sympy.printing.smtlib import smtlib_code
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from sympy.testing.pytest import raises, Failed
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x, y, z = symbols('x,y,z')
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class _W(Enum):
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DEFAULTING_TO_FLOAT = re.compile("Could not infer type of `.+`. Defaulting to float.", re.I)
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WILL_NOT_DECLARE = re.compile("Non-Symbol/Function `.+` will not be declared.", re.I)
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WILL_NOT_ASSERT = re.compile("Non-Boolean expression `.+` will not be asserted. Converting to SMTLib verbatim.", re.I)
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@contextlib.contextmanager
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def _check_warns(expected: typing.Iterable[_W]):
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warns: typing.List[str] = []
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log_warn = warns.append
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yield log_warn
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errors = []
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for i, (w, e) in enumerate(itertools.zip_longest(warns, expected)):
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if not e:
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errors += [f"[{i}] Received unexpected warning `{w}`."]
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elif not w:
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errors += [f"[{i}] Did not receive expected warning `{e.name}`."]
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elif not e.value.match(w):
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errors += [f"[{i}] Warning `{w}` does not match expected {e.name}."]
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if errors: raise Failed('\n'.join(errors))
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def test_Integer():
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with _check_warns([_W.WILL_NOT_ASSERT] * 2) as w:
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assert smtlib_code(Integer(67), log_warn=w) == "67"
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assert smtlib_code(Integer(-1), log_warn=w) == "-1"
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with _check_warns([]) as w:
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assert smtlib_code(Integer(67)) == "67"
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assert smtlib_code(Integer(-1)) == "-1"
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def test_Rational():
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with _check_warns([_W.WILL_NOT_ASSERT] * 4) as w:
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assert smtlib_code(Rational(3, 7), log_warn=w) == "(/ 3 7)"
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assert smtlib_code(Rational(18, 9), log_warn=w) == "2"
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assert smtlib_code(Rational(3, -7), log_warn=w) == "(/ -3 7)"
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assert smtlib_code(Rational(-3, -7), log_warn=w) == "(/ 3 7)"
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with _check_warns([_W.DEFAULTING_TO_FLOAT, _W.WILL_NOT_ASSERT] * 2) as w:
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assert smtlib_code(x + Rational(3, 7), auto_declare=False, log_warn=w) == "(+ (/ 3 7) x)"
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assert smtlib_code(Rational(3, 7) * x, log_warn=w) == "(declare-const x Real)\n" \
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"(* (/ 3 7) x)"
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def test_Relational():
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with _check_warns([_W.DEFAULTING_TO_FLOAT] * 12) as w:
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assert smtlib_code(Eq(x, y), auto_declare=False, log_warn=w) == "(assert (= x y))"
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assert smtlib_code(Ne(x, y), auto_declare=False, log_warn=w) == "(assert (not (= x y)))"
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assert smtlib_code(Le(x, y), auto_declare=False, log_warn=w) == "(assert (<= x y))"
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assert smtlib_code(Lt(x, y), auto_declare=False, log_warn=w) == "(assert (< x y))"
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assert smtlib_code(Gt(x, y), auto_declare=False, log_warn=w) == "(assert (> x y))"
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assert smtlib_code(Ge(x, y), auto_declare=False, log_warn=w) == "(assert (>= x y))"
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def test_Function():
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with _check_warns([_W.DEFAULTING_TO_FLOAT, _W.WILL_NOT_ASSERT]) as w:
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assert smtlib_code(sin(x) ** cos(x), auto_declare=False, log_warn=w) == "(pow (sin x) (cos x))"
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with _check_warns([_W.WILL_NOT_ASSERT]) as w:
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assert smtlib_code(
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abs(x),
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symbol_table={x: int, y: bool},
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known_types={int: "INTEGER_TYPE"},
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known_functions={sympy.Abs: "ABSOLUTE_VALUE_OF"},
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log_warn=w
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) == "(declare-const x INTEGER_TYPE)\n" \
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"(ABSOLUTE_VALUE_OF x)"
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my_fun1 = Function('f1')
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with _check_warns([_W.WILL_NOT_ASSERT]) as w:
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assert smtlib_code(
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my_fun1(x),
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symbol_table={my_fun1: Callable[[bool], float]},
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log_warn=w
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) == "(declare-const x Bool)\n" \
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"(declare-fun f1 (Bool) Real)\n" \
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"(f1 x)"
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with _check_warns([]) as w:
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assert smtlib_code(
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my_fun1(x),
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symbol_table={my_fun1: Callable[[bool], bool]},
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log_warn=w
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) == "(declare-const x Bool)\n" \
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"(declare-fun f1 (Bool) Bool)\n" \
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"(assert (f1 x))"
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assert smtlib_code(
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Eq(my_fun1(x, z), y),
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symbol_table={my_fun1: Callable[[int, bool], bool]},
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log_warn=w
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) == "(declare-const x Int)\n" \
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"(declare-const y Bool)\n" \
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"(declare-const z Bool)\n" \
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"(declare-fun f1 (Int Bool) Bool)\n" \
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"(assert (= (f1 x z) y))"
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assert smtlib_code(
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Eq(my_fun1(x, z), y),
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symbol_table={my_fun1: Callable[[int, bool], bool]},
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known_functions={my_fun1: "MY_KNOWN_FUN", Eq: '=='},
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log_warn=w
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) == "(declare-const x Int)\n" \
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"(declare-const y Bool)\n" \
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"(declare-const z Bool)\n" \
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"(assert (== (MY_KNOWN_FUN x z) y))"
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with _check_warns([_W.DEFAULTING_TO_FLOAT] * 3) as w:
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assert smtlib_code(
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Eq(my_fun1(x, z), y),
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known_functions={my_fun1: "MY_KNOWN_FUN", Eq: '=='},
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log_warn=w
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) == "(declare-const x Real)\n" \
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"(declare-const y Real)\n" \
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"(declare-const z Real)\n" \
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"(assert (== (MY_KNOWN_FUN x z) y))"
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def test_Pow():
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with _check_warns([_W.DEFAULTING_TO_FLOAT, _W.WILL_NOT_ASSERT]) as w:
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assert smtlib_code(x ** 3, auto_declare=False, log_warn=w) == "(pow x 3)"
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with _check_warns([_W.DEFAULTING_TO_FLOAT, _W.DEFAULTING_TO_FLOAT, _W.WILL_NOT_ASSERT]) as w:
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assert smtlib_code(x ** (y ** 3), auto_declare=False, log_warn=w) == "(pow x (pow y 3))"
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with _check_warns([_W.DEFAULTING_TO_FLOAT, _W.WILL_NOT_ASSERT]) as w:
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assert smtlib_code(x ** Rational(2, 3), auto_declare=False, log_warn=w) == '(pow x (/ 2 3))'
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a = Symbol('a', integer=True)
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b = Symbol('b', real=True)
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c = Symbol('c')
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def g(x): return 2 * x
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# if x=1, y=2, then expr=2.333...
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expr = 1 / (g(a) * 3.5) ** (a - b ** a) / (a ** 2 + b)
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with _check_warns([]) as w:
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assert smtlib_code(
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[
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Eq(a < 2, c),
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Eq(b > a, c),
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c & True,
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Eq(expr, 2 + Rational(1, 3))
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],
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log_warn=w
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) == '(declare-const a Int)\n' \
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'(declare-const b Real)\n' \
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'(declare-const c Bool)\n' \
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'(assert (= (< a 2) c))\n' \
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'(assert (= (> b a) c))\n' \
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'(assert c)\n' \
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'(assert (= ' \
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'(* (pow (* 7. a) (+ (pow b a) (* -1 a))) (pow (+ b (pow a 2)) -1)) ' \
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'(/ 7 3)' \
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'))'
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with _check_warns([_W.DEFAULTING_TO_FLOAT, _W.WILL_NOT_ASSERT]) as w:
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assert smtlib_code(
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Mul(-2, c, Pow(Mul(b, b, evaluate=False), -1, evaluate=False), evaluate=False),
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log_warn=w
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) == '(declare-const b Real)\n' \
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'(declare-const c Real)\n' \
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'(* -2 c (pow (* b b) -1))'
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def test_basic_ops():
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with _check_warns([_W.DEFAULTING_TO_FLOAT, _W.DEFAULTING_TO_FLOAT, _W.WILL_NOT_ASSERT]) as w:
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assert smtlib_code(x * y, auto_declare=False, log_warn=w) == "(* x y)"
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with _check_warns([_W.DEFAULTING_TO_FLOAT, _W.DEFAULTING_TO_FLOAT, _W.WILL_NOT_ASSERT]) as w:
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assert smtlib_code(x + y, auto_declare=False, log_warn=w) == "(+ x y)"
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# with _check_warns([_SmtlibWarnings.DEFAULTING_TO_FLOAT, _SmtlibWarnings.DEFAULTING_TO_FLOAT, _SmtlibWarnings.WILL_NOT_ASSERT]) as w:
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# todo: implement re-write, currently does '(+ x (* -1 y))' instead
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# assert smtlib_code(x - y, auto_declare=False, log_warn=w) == "(- x y)"
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with _check_warns([_W.DEFAULTING_TO_FLOAT, _W.WILL_NOT_ASSERT]) as w:
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assert smtlib_code(-x, auto_declare=False, log_warn=w) == "(* -1 x)"
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def test_quantifier_extensions():
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from sympy.logic.boolalg import Boolean
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from sympy import Interval, Tuple, sympify
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# start For-all quantifier class example
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class ForAll(Boolean):
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def _smtlib(self, printer):
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bound_symbol_declarations = [
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printer._s_expr(sym.name, [
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printer._known_types[printer.symbol_table[sym]],
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Interval(start, end)
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]) for sym, start, end in self.limits
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]
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return printer._s_expr('forall', [
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printer._s_expr('', bound_symbol_declarations),
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self.function
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])
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@property
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def bound_symbols(self):
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return {s for s, _, _ in self.limits}
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@property
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def free_symbols(self):
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bound_symbol_names = {s.name for s in self.bound_symbols}
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return {
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s for s in self.function.free_symbols
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if s.name not in bound_symbol_names
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}
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def __new__(cls, *args):
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limits = [sympify(a) for a in args if isinstance(a, tuple) or isinstance(a, Tuple)]
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function = [sympify(a) for a in args if isinstance(a, Boolean)]
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assert len(limits) + len(function) == len(args)
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assert len(function) == 1
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function = function[0]
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if isinstance(function, ForAll): return ForAll.__new__(
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ForAll, *(limits + function.limits), function.function
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)
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inst = Boolean.__new__(cls)
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inst._args = tuple(limits + [function])
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inst.limits = limits
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inst.function = function
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return inst
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# end For-All Quantifier class example
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f = Function('f')
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with _check_warns([_W.DEFAULTING_TO_FLOAT]) as w:
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assert smtlib_code(
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ForAll((x, -42, +21), Eq(f(x), f(x))),
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symbol_table={f: Callable[[float], float]},
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log_warn=w
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) == '(assert (forall ( (x Real [-42, 21])) true))'
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with _check_warns([_W.DEFAULTING_TO_FLOAT] * 2) as w:
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assert smtlib_code(
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ForAll(
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(x, -42, +21), (y, -100, 3),
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Implies(Eq(x, y), Eq(f(x), f(y)))
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),
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symbol_table={f: Callable[[float], float]},
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log_warn=w
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) == '(declare-fun f (Real) Real)\n' \
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'(assert (' \
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'forall ( (x Real [-42, 21]) (y Real [-100, 3])) ' \
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'(=> (= x y) (= (f x) (f y)))' \
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'))'
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a = Symbol('a', integer=True)
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b = Symbol('b', real=True)
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c = Symbol('c')
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with _check_warns([]) as w:
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assert smtlib_code(
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ForAll(
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(a, 2, 100), ForAll(
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(b, 2, 100),
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Implies(a < b, sqrt(a) < b) | c
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)),
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log_warn=w
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) == '(declare-const c Bool)\n' \
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'(assert (forall ( (a Int [2, 100]) (b Real [2, 100])) ' \
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'(or c (=> (< a b) (< (pow a (/ 1 2)) b)))' \
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'))'
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def test_mix_number_mult_symbols():
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with _check_warns([_W.WILL_NOT_ASSERT]) as w:
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assert smtlib_code(
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1 / pi,
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known_constants={pi: "MY_PI"},
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log_warn=w
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) == '(pow MY_PI -1)'
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with _check_warns([_W.WILL_NOT_ASSERT]) as w:
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assert smtlib_code(
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[
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Eq(pi, 3.14, evaluate=False),
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1 / pi,
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],
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known_constants={pi: "MY_PI"},
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log_warn=w
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) == '(assert (= MY_PI 3.14))\n' \
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'(pow MY_PI -1)'
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with _check_warns([_W.WILL_NOT_ASSERT]) as w:
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assert smtlib_code(
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Add(S.Zero, S.One, S.NegativeOne, S.Half,
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S.Exp1, S.Pi, S.GoldenRatio, evaluate=False),
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known_constants={
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S.Pi: 'p', S.GoldenRatio: 'g',
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S.Exp1: 'e'
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},
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known_functions={
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Add: 'plus',
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exp: 'exp'
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},
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precision=3,
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log_warn=w
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) == '(plus 0 1 -1 (/ 1 2) (exp 1) p g)'
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with _check_warns([_W.WILL_NOT_ASSERT]) as w:
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assert smtlib_code(
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Add(S.Zero, S.One, S.NegativeOne, S.Half,
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S.Exp1, S.Pi, S.GoldenRatio, evaluate=False),
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known_constants={
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S.Pi: 'p'
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},
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known_functions={
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Add: 'plus',
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exp: 'exp'
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},
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precision=3,
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log_warn=w
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) == '(plus 0 1 -1 (/ 1 2) (exp 1) p 1.62)'
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with _check_warns([_W.WILL_NOT_ASSERT]) as w:
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assert smtlib_code(
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Add(S.Zero, S.One, S.NegativeOne, S.Half,
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S.Exp1, S.Pi, S.GoldenRatio, evaluate=False),
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known_functions={Add: 'plus'},
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precision=3,
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log_warn=w
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) == '(plus 0 1 -1 (/ 1 2) 2.72 3.14 1.62)'
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with _check_warns([_W.WILL_NOT_ASSERT]) as w:
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assert smtlib_code(
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Add(S.Zero, S.One, S.NegativeOne, S.Half,
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S.Exp1, S.Pi, S.GoldenRatio, evaluate=False),
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known_constants={S.Exp1: 'e'},
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known_functions={Add: 'plus'},
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precision=3,
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log_warn=w
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) == '(plus 0 1 -1 (/ 1 2) e 3.14 1.62)'
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def test_boolean():
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with _check_warns([]) as w:
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assert smtlib_code(x & y, log_warn=w) == '(declare-const x Bool)\n' \
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'(declare-const y Bool)\n' \
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'(assert (and x y))'
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assert smtlib_code(x | y, log_warn=w) == '(declare-const x Bool)\n' \
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'(declare-const y Bool)\n' \
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'(assert (or x y))'
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assert smtlib_code(~x, log_warn=w) == '(declare-const x Bool)\n' \
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'(assert (not x))'
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assert smtlib_code(x & y & z, log_warn=w) == '(declare-const x Bool)\n' \
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'(declare-const y Bool)\n' \
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'(declare-const z Bool)\n' \
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'(assert (and x y z))'
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with _check_warns([_W.DEFAULTING_TO_FLOAT]) as w:
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assert smtlib_code((x & ~y) | (z > 3), log_warn=w) == '(declare-const x Bool)\n' \
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'(declare-const y Bool)\n' \
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'(declare-const z Real)\n' \
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'(assert (or (> z 3) (and x (not y))))'
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f = Function('f')
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g = Function('g')
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h = Function('h')
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with _check_warns([_W.DEFAULTING_TO_FLOAT]) as w:
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assert smtlib_code(
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[Gt(f(x), y),
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Lt(y, g(z))],
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symbol_table={
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f: Callable[[bool], int], g: Callable[[bool], int],
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}, log_warn=w
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) == '(declare-const x Bool)\n' \
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'(declare-const y Real)\n' \
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'(declare-const z Bool)\n' \
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'(declare-fun f (Bool) Int)\n' \
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'(declare-fun g (Bool) Int)\n' \
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'(assert (> (f x) y))\n' \
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'(assert (< y (g z)))'
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with _check_warns([]) as w:
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assert smtlib_code(
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[Eq(f(x), y),
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Lt(y, g(z))],
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symbol_table={
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f: Callable[[bool], int], g: Callable[[bool], int],
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}, log_warn=w
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) == '(declare-const x Bool)\n' \
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'(declare-const y Int)\n' \
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'(declare-const z Bool)\n' \
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'(declare-fun f (Bool) Int)\n' \
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'(declare-fun g (Bool) Int)\n' \
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'(assert (= (f x) y))\n' \
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'(assert (< y (g z)))'
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with _check_warns([]) as w:
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assert smtlib_code(
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[Eq(f(x), y),
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Eq(g(f(x)), z),
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Eq(h(g(f(x))), x)],
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symbol_table={
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f: Callable[[float], int],
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g: Callable[[int], bool],
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h: Callable[[bool], float]
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},
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log_warn=w
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) == '(declare-const x Real)\n' \
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'(declare-const y Int)\n' \
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'(declare-const z Bool)\n' \
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'(declare-fun f (Real) Int)\n' \
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'(declare-fun g (Int) Bool)\n' \
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'(declare-fun h (Bool) Real)\n' \
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'(assert (= (f x) y))\n' \
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'(assert (= (g (f x)) z))\n' \
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'(assert (= (h (g (f x))) x))'
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# todo: make smtlib_code support arrays
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# def test_containers():
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# assert julia_code([1, 2, 3, [4, 5, [6, 7]], 8, [9, 10], 11]) == \
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# "Any[1, 2, 3, Any[4, 5, Any[6, 7]], 8, Any[9, 10], 11]"
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# assert julia_code((1, 2, (3, 4))) == "(1, 2, (3, 4))"
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# assert julia_code([1]) == "Any[1]"
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# assert julia_code((1,)) == "(1,)"
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# assert julia_code(Tuple(*[1, 2, 3])) == "(1, 2, 3)"
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# assert julia_code((1, x * y, (3, x ** 2))) == "(1, x .* y, (3, x .^ 2))"
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# # scalar, matrix, empty matrix and empty list
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# assert julia_code((1, eye(3), Matrix(0, 0, []), [])) == "(1, [1 0 0;\n0 1 0;\n0 0 1], zeros(0, 0), Any[])"
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def test_smtlib_piecewise():
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with _check_warns([_W.DEFAULTING_TO_FLOAT, _W.WILL_NOT_ASSERT]) as w:
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assert smtlib_code(
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Piecewise((x, x < 1),
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(x ** 2, True)),
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auto_declare=False,
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log_warn=w
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) == '(ite (< x 1) x (pow x 2))'
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with _check_warns([_W.DEFAULTING_TO_FLOAT, _W.WILL_NOT_ASSERT]) as w:
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assert smtlib_code(
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Piecewise((x ** 2, x < 1),
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(x ** 3, x < 2),
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(x ** 4, x < 3),
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(x ** 5, True)),
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auto_declare=False,
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log_warn=w
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) == '(ite (< x 1) (pow x 2) ' \
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'(ite (< x 2) (pow x 3) ' \
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'(ite (< x 3) (pow x 4) ' \
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'(pow x 5))))'
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# Check that Piecewise without a True (default) condition error
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expr = Piecewise((x, x < 1), (x ** 2, x > 1), (sin(x), x > 0))
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with _check_warns([_W.DEFAULTING_TO_FLOAT, _W.WILL_NOT_ASSERT]) as w:
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raises(AssertionError, lambda: smtlib_code(expr, log_warn=w))
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def test_smtlib_piecewise_times_const():
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pw = Piecewise((x, x < 1), (x ** 2, True))
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with _check_warns([_W.DEFAULTING_TO_FLOAT, _W.WILL_NOT_ASSERT]) as w:
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assert smtlib_code(2 * pw, log_warn=w) == '(declare-const x Real)\n(* 2 (ite (< x 1) x (pow x 2)))'
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with _check_warns([_W.DEFAULTING_TO_FLOAT, _W.WILL_NOT_ASSERT]) as w:
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assert smtlib_code(pw / x, log_warn=w) == '(declare-const x Real)\n(* (pow x -1) (ite (< x 1) x (pow x 2)))'
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with _check_warns([_W.DEFAULTING_TO_FLOAT, _W.DEFAULTING_TO_FLOAT, _W.WILL_NOT_ASSERT]) as w:
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assert smtlib_code(pw / (x * y), log_warn=w) == '(declare-const x Real)\n(declare-const y Real)\n(* (pow x -1) (pow y -1) (ite (< x 1) x (pow x 2)))'
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with _check_warns([_W.DEFAULTING_TO_FLOAT, _W.WILL_NOT_ASSERT]) as w:
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assert smtlib_code(pw / 3, log_warn=w) == '(declare-const x Real)\n(* (/ 1 3) (ite (< x 1) x (pow x 2)))'
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# todo: make smtlib_code support arrays / matrices ?
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# def test_smtlib_matrix_assign_to():
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# A = Matrix([[1, 2, 3]])
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# assert smtlib_code(A, assign_to='a') == "a = [1 2 3]"
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# A = Matrix([[1, 2], [3, 4]])
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# assert smtlib_code(A, assign_to='A') == "A = [1 2;\n3 4]"
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# def test_julia_matrix_1x1():
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# A = Matrix([[3]])
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# B = MatrixSymbol('B', 1, 1)
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# C = MatrixSymbol('C', 1, 2)
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# assert julia_code(A, assign_to=B) == "B = [3]"
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# raises(ValueError, lambda: julia_code(A, assign_to=C))
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# def test_julia_matrix_elements():
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# A = Matrix([[x, 2, x * y]])
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# assert julia_code(A[0, 0] ** 2 + A[0, 1] + A[0, 2]) == "x .^ 2 + x .* y + 2"
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# A = MatrixSymbol('AA', 1, 3)
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# assert julia_code(A) == "AA"
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# assert julia_code(A[0, 0] ** 2 + sin(A[0, 1]) + A[0, 2]) == \
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# "sin(AA[1,2]) + AA[1,1] .^ 2 + AA[1,3]"
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# assert julia_code(sum(A)) == "AA[1,1] + AA[1,2] + AA[1,3]"
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def test_smtlib_boolean():
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with _check_warns([]) as w:
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assert smtlib_code(True, auto_assert=False, log_warn=w) == 'true'
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assert smtlib_code(True, log_warn=w) == '(assert true)'
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assert smtlib_code(S.true, log_warn=w) == '(assert true)'
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assert smtlib_code(S.false, log_warn=w) == '(assert false)'
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assert smtlib_code(False, log_warn=w) == '(assert false)'
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assert smtlib_code(False, auto_assert=False, log_warn=w) == 'false'
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def test_not_supported():
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f = Function('f')
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with _check_warns([_W.DEFAULTING_TO_FLOAT, _W.WILL_NOT_ASSERT]) as w:
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raises(KeyError, lambda: smtlib_code(f(x).diff(x), symbol_table={f: Callable[[float], float]}, log_warn=w))
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with _check_warns([_W.WILL_NOT_ASSERT]) as w:
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raises(KeyError, lambda: smtlib_code(S.ComplexInfinity, log_warn=w))
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