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from typing import cast, List, Dict, Set, Optional, Union, Tuple | ||
from nagini_contracts.contracts import * | ||
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@Pure | ||
def encode__char(c : int) -> int : | ||
return (c - 97 + 5) % 26 + 97 | ||
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@Pure | ||
def decode__char(c : int) -> int : | ||
return ((c) - (97) - (5)) % 26 + 97 | ||
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def encode__shift(s : List[int]) -> List[int]: | ||
Requires(Acc(list_pred(s))) | ||
Requires(Forall(int, lambda d_0_i_: | ||
not (((0) <= (d_0_i_)) and ((d_0_i_) < (len(s)))) or (((97) <= ((s)[d_0_i_])) and (((s)[d_0_i_]) <= (122))))) | ||
Ensures(Acc(list_pred(Result()))) | ||
Ensures(Acc(list_pred(s))) | ||
Ensures((len(s)) == (len(Result()))) | ||
Ensures(Forall(int, lambda d_1_i_: | ||
not (((0) <= (d_1_i_)) and ((d_1_i_) < (len(s)))) or (((Result())[d_1_i_]) == (encode__char((s)[d_1_i_]))))) | ||
t : List[int] = [] # type : List[int] | ||
d_2_i_ = int(0) # type : int | ||
d_2_i_ = 0 | ||
while (d_2_i_) < (len(s)): | ||
Invariant(Acc(list_pred(t))) | ||
Invariant(Acc(list_pred(s))) | ||
Invariant(((0) <= (d_2_i_)) and ((d_2_i_) <= (len(s)))) | ||
Invariant((len(t)) == (d_2_i_)) | ||
Invariant(Forall(int, lambda d_3_j_: | ||
not (((0) <= (d_3_j_)) and ((d_3_j_) < (d_2_i_))) or (((t)[d_3_j_]) == (encode__char((s)[d_3_j_]))))) | ||
t = (t) + [encode__char((s)[d_2_i_])] | ||
d_2_i_ = (d_2_i_) + (1) | ||
return t | ||
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def decode__shift(s : List[int]) -> List[int]: | ||
Requires(Acc(list_pred(s))) | ||
Requires(Forall(int, lambda d_4_i_: | ||
not (((0) <= (d_4_i_)) and ((d_4_i_) < (len(s)))) or (((97) <= ((s)[d_4_i_])) and (((s)[d_4_i_]) <= (122))))) | ||
Ensures(Acc(list_pred(Result()))) | ||
Ensures(Acc(list_pred(s))) | ||
Ensures((len(s)) == (len(Result()))) | ||
Ensures(Forall(int, lambda d_5_i_: | ||
not (((0) <= (d_5_i_)) and ((d_5_i_) < (len(s)))) or (((Result())[d_5_i_]) == (decode__char((s)[d_5_i_]))))) | ||
t : List[int] = [] | ||
d_6_i_ = int(0) # type : int | ||
d_6_i_ = 0 | ||
while (d_6_i_) < (len(s)): | ||
Invariant(Acc(list_pred(t))) | ||
Invariant(Acc(list_pred(s))) | ||
Invariant(((0) <= (d_6_i_)) and ((d_6_i_) <= (len(s)))) | ||
Invariant((len(t)) == (d_6_i_)) | ||
Invariant(Forall(int, lambda d_7_j_: | ||
not (((0) <= (d_7_j_)) and ((d_7_j_) < (d_6_i_))) or (((t)[d_7_j_]) == (decode__char((s)[d_7_j_]))))) | ||
t = (t) + [decode__char((s)[d_6_i_])] | ||
d_6_i_ = (d_6_i_) + (1) | ||
return t |
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Original file line number | Diff line number | Diff line change |
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from typing import cast, List, Dict, Set, Optional, Union | ||
from nagini_contracts.contracts import * | ||
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def encode(s : List[int]) -> List[int]: | ||
Requires(Acc(list_pred(s))) | ||
Requires(Forall(int, lambda d_0_i_: | ||
not (((0) <= (d_0_i_)) and ((d_0_i_) < (len(s)))) or ((((97) <= ((s)[d_0_i_])) and (((s)[d_0_i_]) <= (122))) or (((65) <= ((s)[d_0_i_])) and (((s)[d_0_i_]) <= (90)))))) | ||
Ensures(Acc(list_pred(Result()))) | ||
Ensures(Acc(list_pred(s))) | ||
Ensures((len(s)) == (len(Result()))) | ||
Ensures(Forall(int, lambda d_1_i_: | ||
not ((((0) <= (d_1_i_)) and ((d_1_i_) < (len(s)))) and (is__vowel((s)[d_1_i_]))) or (((Result())[d_1_i_]) == (rot2(swap__case((s)[d_1_i_])))))) | ||
Ensures(Forall(int, lambda d_2_i_: | ||
not ((((0) <= (d_2_i_)) and ((d_2_i_) < (len(s)))) and (not(is__vowel((s)[d_2_i_])))) or (((Result())[d_2_i_]) == (swap__case((s)[d_2_i_]))))) | ||
t : List[int] = [] | ||
d_3_i_ = int(0) # type : int | ||
d_3_i_ = 0 | ||
while (d_3_i_) < (len(s)): | ||
Invariant(Acc(list_pred(t))) | ||
Invariant(Acc(list_pred(s))) | ||
Invariant(((0) <= (d_3_i_)) and ((d_3_i_) <= (len(s)))) | ||
Invariant((len(t)) == (d_3_i_)) | ||
Invariant(Forall(int, lambda d_4_j_: | ||
not ((((0) <= (d_4_j_)) and ((d_4_j_) < (d_3_i_))) and (is__vowel((s)[d_4_j_]))) or (((t)[d_4_j_]) == (rot2(swap__case((s)[d_4_j_])))))) | ||
Invariant(Forall(int, lambda d_5_j_: | ||
not ((((0) <= (d_5_j_)) and ((d_5_j_) < (d_3_i_))) and (not(is__vowel((s)[d_5_j_])))) or (((t)[d_5_j_]) == (swap__case((s)[d_5_j_]))))) | ||
if is__vowel((s)[d_3_i_]): | ||
t = (t) + [rot2(swap__case((s)[d_3_i_]))] | ||
else: | ||
t = (t) + [swap__case((s)[d_3_i_])] | ||
d_3_i_ = (d_3_i_) + (1) | ||
return t | ||
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@Pure | ||
def swap__case(c : int) -> int : | ||
if ((97) <= (c)) and ((c) <= (122)): | ||
return (65) + ((c) - (97)) | ||
elif True: | ||
return (97) + ((c) - (65)) | ||
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@Pure | ||
def rot2(c : int) -> int : | ||
return (c + 2) | ||
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@Pure | ||
def is__vowel(c : int) -> bool : | ||
return ((((((c) == (97)) or ((c) == (101))) or ((c) == (105))) or ((c) == (111))) or ((c) == (117))) or ((((((c) == (65)) or ((c) == (69))) or ((c) == (73))) or ((c) == (79))) or ((c) == (85))) |
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@@ -0,0 +1,27 @@ | ||
from typing import cast, List, Dict, Set, Optional, Union, Tuple | ||
from nagini_contracts.contracts import * | ||
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@Pure | ||
def psum(i : int, j : int, s : List[int]) -> int : | ||
Requires(Acc(list_pred(s))) | ||
Requires(0 <= i and i <= j + 1 and j < len(s)) | ||
if i > j: | ||
return 0 | ||
else: | ||
return ((s)[j] if ((((j) % 2) == 0) and ((s)[j] % 2 == 1)) else 0) + (psum(i, j - 1, s)) | ||
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def add(v : List[int]) -> int: | ||
Requires(Acc(list_pred(v))) | ||
Ensures(Acc(list_pred(v))) | ||
Ensures((Result()) == (psum(0, len(v) - 1, v))) | ||
r = int(0) # type : int | ||
r = 0 | ||
d_2_k_ = int(0) # type : int | ||
d_2_k_ = 0 | ||
while (d_2_k_) < (len(v)): | ||
Invariant(Acc(list_pred(v))) | ||
Invariant(((0) <= (d_2_k_)) and ((d_2_k_) <= (len(v)))) | ||
Invariant((r) == (psum(0, d_2_k_ - 1, v))) | ||
r = (r) + (((v)[d_2_k_] if ((((d_2_k_) % 2) == 0) and ((v)[d_2_k_] % 2 == 1)) else 0)) | ||
d_2_k_ = (d_2_k_) + (1) | ||
return r |