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Simon Spies
stdpp
Commits
c809b3b5
Commit
c809b3b5
authored
Sep 28, 2017
by
Hai Dang
Committed by
Robbert Krebbers
Sep 29, 2017
Browse files
add filter for gmap
parent
2175e39f
Changes
1
Hide whitespace changes
Inline
Sidebyside
theories/gmap.v
View file @
c809b3b5
...
...
@@ 227,6 +227,102 @@ Proof.

by
rewrite
option_guard_False
by
(
rewrite
not_elem_of_dom
;
eauto
).
Qed
.
(** Filter *)
(* This filter creates a submap whose (key,value) pairs satisfy P *)
Instance
gmap_filter
`
{
Countable
K
}
{
A
}
:
Filter
(
K
*
A
)
(
gmap
K
A
)
:
=
λ
P
_
,
map_fold
(
λ
k
v
m
,
if
decide
(
P
(
k
,
v
))
then
<[
k
:
=
v
]>
m
else
m
)
∅
.
Section
filter
.
Context
`
{
Countable
K
}
{
A
}
(
P
:
K
*
A
→
Prop
)
`
{!
∀
x
,
Decision
(
P
x
)}.
Implicit
Type
(
m
:
gmap
K
A
)
(
k
:
K
)
(
v
:
A
).
Lemma
gmap_filter_lookup_Some
:
∀
m
k
v
,
filter
P
m
!!
k
=
Some
v
↔
m
!!
k
=
Some
v
∧
P
(
k
,
v
).
Proof
.
apply
(
map_fold_ind
(
λ
m1
m2
,
∀
k
v
,
m1
!!
k
=
Some
v
↔
m2
!!
k
=
Some
v
∧
P
_
)).

naive_solver
.

intros
k
v
m
m'
Hm
Eq
k'
v'
.
case_match
;
case
(
decide
(
k'
=
k
))
as
[>?].
+
rewrite
2
!
lookup_insert
.
naive_solver
.
+
do
2
(
rewrite
lookup_insert_ne
;
[
auto
]).
by
apply
Eq
.
+
rewrite
Eq
,
Hm
,
lookup_insert
.
split
;
[
naive_solver
].
destruct
1
as
[
Eq'
].
inversion
Eq'
.
by
subst
.
+
by
rewrite
lookup_insert_ne
.
Qed
.
Lemma
gmap_filter_lookup_None
:
∀
m
k
,
filter
P
m
!!
k
=
None
↔
m
!!
k
=
None
∨
∀
v
,
m
!!
k
=
Some
v
→
¬
P
(
k
,
v
).
Proof
.
apply
(
map_fold_ind
(
λ
m1
m2
,
∀
k
,
m1
!!
k
=
None
↔
(
m2
!!
k
=
None
∨
∀
v
,
m2
!!
k
=
Some
v
→
¬
P
_
))).

naive_solver
.

intros
k
v
m
m'
Hm
Eq
k'
.
case_match
;
case
(
decide
(
k'
=
k
))
as
[>?].
+
rewrite
2
!
lookup_insert
.
naive_solver
.
+
do
2
(
rewrite
lookup_insert_ne
;
[
auto
]).
by
apply
Eq
.
+
rewrite
Eq
,
Hm
,
lookup_insert
.
naive_solver
.
+
by
rewrite
lookup_insert_ne
.
Qed
.
Lemma
gmap_filter_dom
m
:
dom
(
gset
K
)
(
filter
P
m
)
⊆
dom
(
gset
K
)
m
.
Proof
.
intros
?.
rewrite
2
!
elem_of_dom
.
destruct
1
as
[?[
Eq
_
]%
gmap_filter_lookup_Some
].
by
eexists
.
Qed
.
Lemma
gmap_filter_lookup_equiv
`
{
Equiv
A
}
`
{
Reflexive
A
(
≡
)}
m1
m2
:
(
∀
k
v
,
P
(
k
,
v
)
→
m1
!!
k
=
Some
v
↔
m2
!!
k
=
Some
v
)
→
filter
P
m1
≡
filter
P
m2
.
Proof
.
intros
HP
k
.
destruct
(
filter
P
m1
!!
k
)
as
[
v1
]
eqn
:
Hv1
;
[
apply
gmap_filter_lookup_Some
in
Hv1
as
[
Hv1
HP1
]
;
specialize
(
HP
k
v1
HP1
)]
;
destruct
(
filter
P
m2
!!
k
)
as
[
v2
]
eqn
:
Hv2
.

apply
gmap_filter_lookup_Some
in
Hv2
as
[
Hv2
_
].
rewrite
Hv1
,
Hv2
in
HP
.
destruct
HP
as
[
HP
_
].
specialize
(
HP
(
eq_refl
_
))
as
[].
by
apply
option_Forall2_refl
.

apply
gmap_filter_lookup_None
in
Hv2
as
[
Hv2

Hv2
]
;
[
naive_solver

by
apply
HP
,
Hv2
in
Hv1
].

apply
gmap_filter_lookup_Some
in
Hv2
as
[
Hv2
HP2
].
specialize
(
HP
k
v2
HP2
).
apply
gmap_filter_lookup_None
in
Hv1
as
[
Hv1

Hv1
].
+
rewrite
Hv1
in
HP
.
naive_solver
.
+
by
apply
HP
,
Hv1
in
Hv2
.

by
apply
option_Forall2_refl
.
Qed
.
Lemma
gmap_filter_lookup_insert
`
{
Equiv
A
}
`
{
Reflexive
A
(
≡
)}
m
k
v
:
P
(
k
,
v
)
→
<[
k
:
=
v
]>
(
filter
P
m
)
≡
filter
P
(<[
k
:
=
v
]>
m
).
Proof
.
intros
HP
k'
.
case
(
decide
(
k'
=
k
))
as
[>?]
;
[
rewrite
lookup_insert

rewrite
lookup_insert_ne
;
[
auto
]].

destruct
(
filter
P
(<[
k
:
=
v
]>
m
)
!!
k
)
eqn
:
Hk
.
+
apply
gmap_filter_lookup_Some
in
Hk
.
rewrite
lookup_insert
in
Hk
.
destruct
Hk
as
[
Hk
_
].
inversion
Hk
.
by
apply
option_Forall2_refl
.
+
apply
gmap_filter_lookup_None
in
Hk
.
rewrite
lookup_insert
in
Hk
.
destruct
Hk
as
[>
HNP
].
by
apply
option_Forall2_refl
.
by
specialize
(
HNP
v
(
eq_refl
_
)).

destruct
(
filter
P
(<[
k
:
=
v
]>
m
)
!!
k'
)
eqn
:
Hk
;
revert
Hk
;
[
rewrite
gmap_filter_lookup_Some

rewrite
gmap_filter_lookup_None
]
;
(
rewrite
lookup_insert_ne
;
[
by
auto
])
;
[
rewrite
<
gmap_filter_lookup_Some

rewrite
<
gmap_filter_lookup_None
]
;
intros
Hk
;
rewrite
Hk
;
by
apply
option_Forall2_refl
.
Qed
.
Lemma
gmap_filter_empty
`
{
Equiv
A
}
:
filter
P
(
∅
:
gmap
K
A
)
≡
∅
.
Proof
.
intro
l
.
rewrite
lookup_empty
.
constructor
.
Qed
.
End
filter
.
(** * Fresh elements *)
(* This is pretty adhoc and just for the case of [gset positive]. We need a
notion of countable nonfinite types to generalize this. *)
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