(* Title: HOL/Library/Mapping.thy
Author: Florian Haftmann and Ondrej Kuncar
*)
section \<open>An abstract view on maps for code generation.\<close>
theory Mapping
imports Main
begin
subsection \<open>Parametricity transfer rules\<close>
lemma map_of_foldr: "map_of xs = foldr (\<lambda>(k, v) m. m(k \<mapsto> v)) xs Map.empty" (* FIXME move *)
using map_add_map_of_foldr [of Map.empty] by auto
context includes lifting_syntax
begin
lemma empty_parametric: "(A ===> rel_option B) Map.empty Map.empty"
by transfer_prover
lemma lookup_parametric: "((A ===> B) ===> A ===> B) (\<lambda>m k. m k) (\<lambda>m k. m k)"
by transfer_prover
lemma update_parametric:
assumes [transfer_rule]: "bi_unique A"
shows "(A ===> B ===> (A ===> rel_option B) ===> A ===> rel_option B)
(\<lambda>k v m. m(k \<mapsto> v)) (\<lambda>k v m. m(k \<mapsto> v))"
by transfer_prover
lemma delete_parametric:
assumes [transfer_rule]: "bi_unique A"
shows "(A ===> (A ===> rel_option B) ===> A ===> rel_option B)
(\<lambda>k m. m(k := None)) (\<lambda>k m. m(k := None))"
by transfer_prover
lemma is_none_parametric [transfer_rule]:
"(rel_option A ===> HOL.eq) Option.is_none Option.is_none"
by (auto simp add: Option.is_none_def rel_fun_def rel_option_iff split: option.split)
lemma dom_parametric:
assumes [transfer_rule]: "bi_total A"
shows "((A ===> rel_option B) ===> rel_set A) dom dom"
unfolding dom_def [abs_def] Option.is_none_def [symmetric] by transfer_prover
lemma map_of_parametric [transfer_rule]:
assumes [transfer_rule]: "bi_unique R1"
shows "(list_all2 (rel_prod R1 R2) ===> R1 ===> rel_option R2) map_of map_of"
unfolding map_of_def by transfer_prover
lemma map_entry_parametric [transfer_rule]:
assumes [transfer_rule]: "bi_unique A"
shows "(A ===> (B ===> B) ===> (A ===> rel_option B) ===> A ===> rel_option B)
(\<lambda>k f m. (case m k of None \<Rightarrow> m
| Some v \<Rightarrow> m (k \<mapsto> (f v)))) (\<lambda>k f m. (case m k of None \<Rightarrow> m
| Some v \<Rightarrow> m (k \<mapsto> (f v))))"
by transfer_prover
lemma tabulate_parametric:
assumes [transfer_rule]: "bi_unique A"
shows "(list_all2 A ===> (A ===> B) ===> A ===> rel_option B)
(\<lambda>ks f. (map_of (map (\<lambda>k. (k, f k)) ks))) (\<lambda>ks f. (map_of (map (\<lambda>k. (k, f k)) ks)))"
by transfer_prover
lemma bulkload_parametric:
"(list_all2 A ===> HOL.eq ===> rel_option A)
(\<lambda>xs k. if k < length xs then Some (xs ! k) else None)
(\<lambda>xs k. if k < length xs then Some (xs ! k) else None)"
proof
fix xs ys
assume "list_all2 A xs ys"
then show
"(HOL.eq ===> rel_option A)
(\<lambda>k. if k < length xs then Some (xs ! k) else None)
(\<lambda>k. if k < length ys then Some (ys ! k) else None)"
apply induct
apply auto
unfolding rel_fun_def
apply clarsimp
apply (case_tac xa)
apply (auto dest: list_all2_lengthD list_all2_nthD)
done
qed
lemma map_parametric:
"((A ===> B) ===> (C ===> D) ===> (B ===> rel_option C) ===> A ===> rel_option D)
(\<lambda>f g m. (map_option g \<circ> m \<circ> f)) (\<lambda>f g m. (map_option g \<circ> m \<circ> f))"
by transfer_prover
lemma combine_with_key_parametric:
"((A ===> B ===> B ===> B) ===> (A ===> rel_option B) ===> (A ===> rel_option B) ===>
(A ===> rel_option B)) (\<lambda>f m1 m2 x. combine_options (f x) (m1 x) (m2 x))
(\<lambda>f m1 m2 x. combine_options (f x) (m1 x) (m2 x))"
unfolding combine_options_def by transfer_prover
lemma combine_parametric:
"((B ===> B ===> B) ===> (A ===> rel_option B) ===> (A ===> rel_option B) ===>
(A ===> rel_option B)) (\<lambda>f m1 m2 x. combine_options f (m1 x) (m2 x))
(\<lambda>f m1 m2 x. combine_options f (m1 x) (m2 x))"
unfolding combine_options_def by transfer_prover
end
subsection \<open>Type definition and primitive operations\<close>
typedef ('a, 'b) mapping = "UNIV :: ('a \<rightharpoonup> 'b) set"
morphisms rep Mapping ..
setup_lifting type_definition_mapping
lift_definition empty :: "('a, 'b) mapping"
is Map.empty parametric empty_parametric .
lift_definition lookup :: "('a, 'b) mapping \<Rightarrow> 'a \<Rightarrow> 'b option"
is "\<lambda>m k. m k" parametric lookup_parametric .
definition "lookup_default d m k = (case Mapping.lookup m k of None \<Rightarrow> d | Some v \<Rightarrow> v)"
lift_definition update :: "'a \<Rightarrow> 'b \<Rightarrow> ('a, 'b) mapping \<Rightarrow> ('a, 'b) mapping"
is "\<lambda>k v m. m(k \<mapsto> v)" parametric update_parametric .
lift_definition delete :: "'a \<Rightarrow> ('a, 'b) mapping \<Rightarrow> ('a, 'b) mapping"
is "\<lambda>k m. m(k := None)" parametric delete_parametric .
lift_definition filter :: "('a \<Rightarrow> 'b \<Rightarrow> bool) \<Rightarrow> ('a, 'b) mapping \<Rightarrow> ('a, 'b) mapping"
is "\<lambda>P m k. case m k of None \<Rightarrow> None | Some v \<Rightarrow> if P k v then Some v else None" .
lift_definition keys :: "('a, 'b) mapping \<Rightarrow> 'a set"
is dom parametric dom_parametric .
lift_definition tabulate :: "'a list \<Rightarrow> ('a \<Rightarrow> 'b) \<Rightarrow> ('a, 'b) mapping"
is "\<lambda>ks f. (map_of (List.map (\<lambda>k. (k, f k)) ks))" parametric tabulate_parametric .
lift_definition bulkload :: "'a list \<Rightarrow> (nat, 'a) mapping"
is "\<lambda>xs k. if k < length xs then Some (xs ! k) else None" parametric bulkload_parametric .
lift_definition map :: "('c \<Rightarrow> 'a) \<Rightarrow> ('b \<Rightarrow> 'd) \<Rightarrow> ('a, 'b) mapping \<Rightarrow> ('c, 'd) mapping"
is "\<lambda>f g m. (map_option g \<circ> m \<circ> f)" parametric map_parametric .
lift_definition map_values :: "('c \<Rightarrow> 'a \<Rightarrow> 'b) \<Rightarrow> ('c, 'a) mapping \<Rightarrow> ('c, 'b) mapping"
is "\<lambda>f m x. map_option (f x) (m x)" .
lift_definition combine_with_key ::
"('a \<Rightarrow> 'b \<Rightarrow> 'b \<Rightarrow> 'b) \<Rightarrow> ('a,'b) mapping \<Rightarrow> ('a,'b) mapping \<Rightarrow> ('a,'b) mapping"
is "\<lambda>f m1 m2 x. combine_options (f x) (m1 x) (m2 x)" parametric combine_with_key_parametric .
lift_definition combine ::
"('b \<Rightarrow> 'b \<Rightarrow> 'b) \<Rightarrow> ('a,'b) mapping \<Rightarrow> ('a,'b) mapping \<Rightarrow> ('a,'b) mapping"
is "\<lambda>f m1 m2 x. combine_options f (m1 x) (m2 x)" parametric combine_parametric .
definition "All_mapping m P \<longleftrightarrow>
(\<forall>x. case Mapping.lookup m x of None \<Rightarrow> True | Some y \<Rightarrow> P x y)"
declare [[code drop: map]]
subsection \<open>Functorial structure\<close>
functor map: map
by (transfer, auto simp add: fun_eq_iff option.map_comp option.map_id)+
subsection \<open>Derived operations\<close>
definition ordered_keys :: "('a::linorder, 'b) mapping \<Rightarrow> 'a list"
where "ordered_keys m = (if finite (keys m) then sorted_list_of_set (keys m) else [])"
definition is_empty :: "('a, 'b) mapping \<Rightarrow> bool"
where "is_empty m \<longleftrightarrow> keys m = {}"
definition size :: "('a, 'b) mapping \<Rightarrow> nat"
where "size m = (if finite (keys m) then card (keys m) else 0)"
definition replace :: "'a \<Rightarrow> 'b \<Rightarrow> ('a, 'b) mapping \<Rightarrow> ('a, 'b) mapping"
where "replace k v m = (if k \<in> keys m then update k v m else m)"
definition default :: "'a \<Rightarrow> 'b \<Rightarrow> ('a, 'b) mapping \<Rightarrow> ('a, 'b) mapping"
where "default k v m = (if k \<in> keys m then m else update k v m)"
text \<open>Manual derivation of transfer rule is non-trivial\<close>
lift_definition map_entry :: "'a \<Rightarrow> ('b \<Rightarrow> 'b) \<Rightarrow> ('a, 'b) mapping \<Rightarrow> ('a, 'b) mapping" is
"\<lambda>k f m.
(case m k of
None \<Rightarrow> m
| Some v \<Rightarrow> m (k \<mapsto> (f v)))" parametric map_entry_parametric .
lemma map_entry_code [code]:
"map_entry k f m =
(case lookup m k of
None \<Rightarrow> m
| Some v \<Rightarrow> update k (f v) m)"
by transfer rule
definition map_default :: "'a \<Rightarrow> 'b \<Rightarrow> ('b \<Rightarrow> 'b) \<Rightarrow> ('a, 'b) mapping \<Rightarrow> ('a, 'b) mapping"
where "map_default k v f m = map_entry k f (default k v m)"
definition of_alist :: "('k \<times> 'v) list \<Rightarrow> ('k, 'v) mapping"
where "of_alist xs = foldr (\<lambda>(k, v) m. update k v m) xs empty"
instantiation mapping :: (type, type) equal
begin
definition "HOL.equal m1 m2 \<longleftrightarrow> (\<forall>k. lookup m1 k = lookup m2 k)"
instance
apply standard
unfolding equal_mapping_def
apply transfer
apply auto
done
end
context includes lifting_syntax
begin
lemma [transfer_rule]:
assumes [transfer_rule]: "bi_total A"
and [transfer_rule]: "bi_unique B"
shows "(pcr_mapping A B ===> pcr_mapping A B ===> (=)) HOL.eq HOL.equal"
unfolding equal by transfer_prover
lemma of_alist_transfer [transfer_rule]:
assumes [transfer_rule]: "bi_unique R1"
shows "(list_all2 (rel_prod R1 R2) ===> pcr_mapping R1 R2) map_of of_alist"
unfolding of_alist_def [abs_def] map_of_foldr [abs_def] by transfer_prover
end
subsection \<open>Properties\<close>
lemma mapping_eqI: "(\<And>x. lookup m x = lookup m' x) \<Longrightarrow> m = m'"
by transfer (simp add: fun_eq_iff)
lemma mapping_eqI':
assumes "\<And>x. x \<in> Mapping.keys m \<Longrightarrow> Mapping.lookup_default d m x = Mapping.lookup_default d m' x"
and "Mapping.keys m = Mapping.keys m'"
shows "m = m'"
proof (intro mapping_eqI)
show "Mapping.lookup m x = Mapping.lookup m' x" for x
proof (cases "Mapping.lookup m x")
case None
then have "x \<notin> Mapping.keys m"
by transfer (simp add: dom_def)
then have "x \<notin> Mapping.keys m'"
by (simp add: assms)
then have "Mapping.lookup m' x = None"
by transfer (simp add: dom_def)
with None show ?thesis
by simp
next
case (Some y)
then have A: "x \<in> Mapping.keys m"
by transfer (simp add: dom_def)
then have "x \<in> Mapping.keys m'"
by (simp add: assms)
then have "\<exists>y'. Mapping.lookup m' x = Some y'"
by transfer (simp add: dom_def)
with Some assms(1)[OF A] show ?thesis
by (auto simp add: lookup_default_def)
qed
qed
lemma lookup_update: "lookup (update k v m) k = Some v"
by transfer simp
lemma lookup_update_neq: "k \<noteq> k' \<Longrightarrow> lookup (update k v m) k' = lookup m k'"
by transfer simp
lemma lookup_update': "Mapping.lookup (update k v m) k' = (if k = k' then Some v else lookup m k')"
by (auto simp: lookup_update lookup_update_neq)
lemma lookup_empty: "lookup empty k = None"
by transfer simp
lemma lookup_filter:
"lookup (filter P m) k =
(case lookup m k of
None \<Rightarrow> None
| Some v \<Rightarrow> if P k v then Some v else None)"
by transfer simp_all
lemma lookup_map_values: "lookup (map_values f m) k = map_option (f k) (lookup m k)"
by transfer simp_all
lemma lookup_default_empty: "lookup_default d empty k = d"
by (simp add: lookup_default_def lookup_empty)
lemma lookup_default_update: "lookup_default d (update k v m) k = v"
by (simp add: lookup_default_def lookup_update)
lemma lookup_default_update_neq:
"k \<noteq> k' \<Longrightarrow> lookup_default d (update k v m) k' = lookup_default d m k'"
by (simp add: lookup_default_def lookup_update_neq)
lemma lookup_default_update':
"lookup_default d (update k v m) k' = (if k = k' then v else lookup_default d m k')"
by (auto simp: lookup_default_update lookup_default_update_neq)
lemma lookup_default_filter:
"lookup_default d (filter P m) k =
(if P k (lookup_default d m k) then lookup_default d m k else d)"
by (simp add: lookup_default_def lookup_filter split: option.splits)
lemma lookup_default_map_values:
"lookup_default (f k d) (map_values f m) k = f k (lookup_default d m k)"
by (simp add: lookup_default_def lookup_map_values split: option.splits)
lemma lookup_combine_with_key:
"Mapping.lookup (combine_with_key f m1 m2) x =
combine_options (f x) (Mapping.lookup m1 x) (Mapping.lookup m2 x)"
by transfer (auto split: option.splits)
lemma combine_altdef: "combine f m1 m2 = combine_with_key (\<lambda>_. f) m1 m2"
by transfer' (rule refl)
lemma lookup_combine:
"Mapping.lookup (combine f m1 m2) x =
combine_options f (Mapping.lookup m1 x) (Mapping.lookup m2 x)"
by transfer (auto split: option.splits)
lemma lookup_default_neutral_combine_with_key:
assumes "\<And>x. f k d x = x" "\<And>x. f k x d = x"
shows "Mapping.lookup_default d (combine_with_key f m1 m2) k =
f k (Mapping.lookup_default d m1 k) (Mapping.lookup_default d m2 k)"
by (auto simp: lookup_default_def lookup_combine_with_key assms split: option.splits)
lemma lookup_default_neutral_combine:
assumes "\<And>x. f d x = x" "\<And>x. f x d = x"
shows "Mapping.lookup_default d (combine f m1 m2) x =
f (Mapping.lookup_default d m1 x) (Mapping.lookup_default d m2 x)"
by (auto simp: lookup_default_def lookup_combine assms split: option.splits)
lemma lookup_map_entry: "lookup (map_entry x f m) x = map_option f (lookup m x)"
by transfer (auto split: option.splits)
lemma lookup_map_entry_neq: "x \<noteq> y \<Longrightarrow> lookup (map_entry x f m) y = lookup m y"
by transfer (auto split: option.splits)
lemma lookup_map_entry':
"lookup (map_entry x f m) y =
(if x = y then map_option f (lookup m y) else lookup m y)"
by transfer (auto split: option.splits)
lemma lookup_default: "lookup (default x d m) x = Some (lookup_default d m x)"
unfolding lookup_default_def default_def
by transfer (auto split: option.splits)
lemma lookup_default_neq: "x \<noteq> y \<Longrightarrow> lookup (default x d m) y = lookup m y"
unfolding lookup_default_def default_def
by transfer (auto split: option.splits)
lemma lookup_default':
"lookup (default x d m) y =
(if x = y then Some (lookup_default d m x) else lookup m y)"
unfolding lookup_default_def default_def
by transfer (auto split: option.splits)
lemma lookup_map_default: "lookup (map_default x d f m) x = Some (f (lookup_default d m x))"
unfolding lookup_default_def default_def
by (simp add: map_default_def lookup_map_entry lookup_default lookup_default_def)
lemma lookup_map_default_neq: "x \<noteq> y \<Longrightarrow> lookup (map_default x d f m) y = lookup m y"
unfolding lookup_default_def default_def
by (simp add: map_default_def lookup_map_entry_neq lookup_default_neq)
lemma lookup_map_default':
"lookup (map_default x d f m) y =
(if x = y then Some (f (lookup_default d m x)) else lookup m y)"
unfolding lookup_default_def default_def
by (simp add: map_default_def lookup_map_entry' lookup_default' lookup_default_def)
lemma lookup_tabulate:
assumes "distinct xs"
shows "Mapping.lookup (Mapping.tabulate xs f) x = (if x \<in> set xs then Some (f x) else None)"
using assms by transfer (auto simp: map_of_eq_None_iff o_def dest!: map_of_SomeD)
lemma lookup_of_alist: "Mapping.lookup (Mapping.of_alist xs) k = map_of xs k"
by transfer simp_all
lemma keys_is_none_rep [code_unfold]: "k \<in> keys m \<longleftrightarrow> \<not> (Option.is_none (lookup m k))"
by transfer (auto simp add: Option.is_none_def)
lemma update_update:
"update k v (update k w m) = update k v m"
"k \<noteq> l \<Longrightarrow> update k v (update l w m) = update l w (update k v m)"
by (transfer; simp add: fun_upd_twist)+
lemma update_delete [simp]: "update k v (delete k m) = update k v m"
by transfer simp
lemma delete_update:
"delete k (update k v m) = delete k m"
"k \<noteq> l \<Longrightarrow> delete k (update l v m) = update l v (delete k m)"
by (transfer; simp add: fun_upd_twist)+
lemma delete_empty [simp]: "delete k empty = empty"
by transfer simp
lemma replace_update:
"k \<notin> keys m \<Longrightarrow> replace k v m = m"
"k \<in> keys m \<Longrightarrow> replace k v m = update k v m"
by (transfer; auto simp add: replace_def fun_upd_twist)+
lemma map_values_update: "map_values f (update k v m) = update k (f k v) (map_values f m)"
by transfer (simp_all add: fun_eq_iff)
lemma size_mono: "finite (keys m') \<Longrightarrow> keys m \<subseteq> keys m' \<Longrightarrow> size m \<le> size m'"
unfolding size_def by (auto intro: card_mono)
lemma size_empty [simp]: "size empty = 0"
unfolding size_def by transfer simp
lemma size_update:
"finite (keys m) \<Longrightarrow> size (update k v m) =
(if k \<in> keys m then size m else Suc (size m))"
unfolding size_def by transfer (auto simp add: insert_dom)
lemma size_delete: "size (delete k m) = (if k \<in> keys m then size m - 1 else size m)"
unfolding size_def by transfer simp
lemma size_tabulate [simp]: "size (tabulate ks f) = length (remdups ks)"
unfolding size_def by transfer (auto simp add: map_of_map_restrict card_set comp_def)
lemma keys_filter: "keys (filter P m) \<subseteq> keys m"
by transfer (auto split: option.splits)
lemma size_filter: "finite (keys m) \<Longrightarrow> size (filter P m) \<le> size m"
by (intro size_mono keys_filter)
lemma bulkload_tabulate: "bulkload xs = tabulate [0..<length xs] (nth xs)"
by transfer (auto simp add: map_of_map_restrict)
lemma is_empty_empty [simp]: "is_empty empty"
unfolding is_empty_def by transfer simp
lemma is_empty_update [simp]: "\<not> is_empty (update k v m)"
unfolding is_empty_def by transfer simp
lemma is_empty_delete: "is_empty (delete k m) \<longleftrightarrow> is_empty m \<or> keys m = {k}"
unfolding is_empty_def by transfer (auto simp del: dom_eq_empty_conv)
lemma is_empty_replace [simp]: "is_empty (replace k v m) \<longleftrightarrow> is_empty m"
unfolding is_empty_def replace_def by transfer auto
lemma is_empty_default [simp]: "\<not> is_empty (default k v m)"
unfolding is_empty_def default_def by transfer auto
lemma is_empty_map_entry [simp]: "is_empty (map_entry k f m) \<longleftrightarrow> is_empty m"
unfolding is_empty_def by transfer (auto split: option.split)
lemma is_empty_map_values [simp]: "is_empty (map_values f m) \<longleftrightarrow> is_empty m"
unfolding is_empty_def by transfer (auto simp: fun_eq_iff)
lemma is_empty_map_default [simp]: "\<not> is_empty (map_default k v f m)"
by (simp add: map_default_def)
lemma keys_dom_lookup: "keys m = dom (Mapping.lookup m)"
by transfer rule
lemma keys_empty [simp]: "keys empty = {}"
by transfer simp
lemma keys_update [simp]: "keys (update k v m) = insert k (keys m)"
by transfer simp
lemma keys_delete [simp]: "keys (delete k m) = keys m - {k}"
by transfer simp
lemma keys_replace [simp]: "keys (replace k v m) = keys m"
unfolding replace_def by transfer (simp add: insert_absorb)
lemma keys_default [simp]: "keys (default k v m) = insert k (keys m)"
unfolding default_def by transfer (simp add: insert_absorb)
lemma keys_map_entry [simp]: "keys (map_entry k f m) = keys m"
by transfer (auto split: option.split)
lemma keys_map_default [simp]: "keys (map_default k v f m) = insert k (keys m)"
by (simp add: map_default_def)
lemma keys_map_values [simp]: "keys (map_values f m) = keys m"
by transfer (simp_all add: dom_def)
lemma keys_combine_with_key [simp]:
"Mapping.keys (combine_with_key f m1 m2) = Mapping.keys m1 \<union> Mapping.keys m2"
by transfer (auto simp: dom_def combine_options_def split: option.splits)
lemma keys_combine [simp]: "Mapping.keys (combine f m1 m2) = Mapping.keys m1 \<union> Mapping.keys m2"
by (simp add: combine_altdef)
lemma keys_tabulate [simp]: "keys (tabulate ks f) = set ks"
by transfer (simp add: map_of_map_restrict o_def)
lemma keys_of_alist [simp]: "keys (of_alist xs) = set (List.map fst xs)"
by transfer (simp_all add: dom_map_of_conv_image_fst)
lemma keys_bulkload [simp]: "keys (bulkload xs) = {0..<length xs}"
by (simp add: bulkload_tabulate)
lemma distinct_ordered_keys [simp]: "distinct (ordered_keys m)"
by (simp add: ordered_keys_def)
lemma ordered_keys_infinite [simp]: "\<not> finite (keys m) \<Longrightarrow> ordered_keys m = []"
by (simp add: ordered_keys_def)
lemma ordered_keys_empty [simp]: "ordered_keys empty = []"
by (simp add: ordered_keys_def)
lemma ordered_keys_update [simp]:
"k \<in> keys m \<Longrightarrow> ordered_keys (update k v m) = ordered_keys m"
"finite (keys m) \<Longrightarrow> k \<notin> keys m \<Longrightarrow>
ordered_keys (update k v m) = insort k (ordered_keys m)"
by (simp_all add: ordered_keys_def)
(auto simp only: sorted_list_of_set_insert [symmetric] insert_absorb)
lemma ordered_keys_delete [simp]: "ordered_keys (delete k m) = remove1 k (ordered_keys m)"
proof (cases "finite (keys m)")
case False
then show ?thesis by simp
next
case fin: True
show ?thesis
proof (cases "k \<in> keys m")
case False
with fin have "k \<notin> set (sorted_list_of_set (keys m))"
by simp
with False show ?thesis
by (simp add: ordered_keys_def remove1_idem)
next
case True
with fin show ?thesis
by (simp add: ordered_keys_def sorted_list_of_set_remove)
qed
qed
lemma ordered_keys_replace [simp]: "ordered_keys (replace k v m) = ordered_keys m"
by (simp add: replace_def)
lemma ordered_keys_default [simp]:
"k \<in> keys m \<Longrightarrow> ordered_keys (default k v m) = ordered_keys m"
"finite (keys m) \<Longrightarrow> k \<notin> keys m \<Longrightarrow> ordered_keys (default k v m) = insort k (ordered_keys m)"
by (simp_all add: default_def)
lemma ordered_keys_map_entry [simp]: "ordered_keys (map_entry k f m) = ordered_keys m"
by (simp add: ordered_keys_def)
lemma ordered_keys_map_default [simp]:
"k \<in> keys m \<Longrightarrow> ordered_keys (map_default k v f m) = ordered_keys m"
"finite (keys m) \<Longrightarrow> k \<notin> keys m \<Longrightarrow> ordered_keys (map_default k v f m) = insort k (ordered_keys m)"
by (simp_all add: map_default_def)
lemma ordered_keys_tabulate [simp]: "ordered_keys (tabulate ks f) = sort (remdups ks)"
by (simp add: ordered_keys_def sorted_list_of_set_sort_remdups)
lemma ordered_keys_bulkload [simp]: "ordered_keys (bulkload ks) = [0..<length ks]"
by (simp add: ordered_keys_def)
lemma tabulate_fold: "tabulate xs f = fold (\<lambda>k m. update k (f k) m) xs empty"
proof transfer
fix f :: "'a \<Rightarrow> 'b" and xs
have "map_of (List.map (\<lambda>k. (k, f k)) xs) = foldr (\<lambda>k m. m(k \<mapsto> f k)) xs Map.empty"
by (simp add: foldr_map comp_def map_of_foldr)
also have "foldr (\<lambda>k m. m(k \<mapsto> f k)) xs = fold (\<lambda>k m. m(k \<mapsto> f k)) xs"
by (rule foldr_fold) (simp add: fun_eq_iff)
ultimately show "map_of (List.map (\<lambda>k. (k, f k)) xs) = fold (\<lambda>k m. m(k \<mapsto> f k)) xs Map.empty"
by simp
qed
lemma All_mapping_mono:
"(\<And>k v. k \<in> keys m \<Longrightarrow> P k v \<Longrightarrow> Q k v) \<Longrightarrow> All_mapping m P \<Longrightarrow> All_mapping m Q"
unfolding All_mapping_def by transfer (auto simp: All_mapping_def dom_def split: option.splits)
lemma All_mapping_empty [simp]: "All_mapping Mapping.empty P"
by (auto simp: All_mapping_def lookup_empty)
lemma All_mapping_update_iff:
"All_mapping (Mapping.update k v m) P \<longleftrightarrow> P k v \<and> All_mapping m (\<lambda>k' v'. k = k' \<or> P k' v')"
unfolding All_mapping_def
proof safe
assume "\<forall>x. case Mapping.lookup (Mapping.update k v m) x of None \<Rightarrow> True | Some y \<Rightarrow> P x y"
then have *: "case Mapping.lookup (Mapping.update k v m) x of None \<Rightarrow> True | Some y \<Rightarrow> P x y" for x
by blast
from *[of k] show "P k v"
by (simp add: lookup_update)
show "case Mapping.lookup m x of None \<Rightarrow> True | Some v' \<Rightarrow> k = x \<or> P x v'" for x
using *[of x] by (auto simp add: lookup_update' split: if_splits option.splits)
next
assume "P k v"
assume "\<forall>x. case Mapping.lookup m x of None \<Rightarrow> True | Some v' \<Rightarrow> k = x \<or> P x v'"
then have A: "case Mapping.lookup m x of None \<Rightarrow> True | Some v' \<Rightarrow> k = x \<or> P x v'" for x
by blast
show "case Mapping.lookup (Mapping.update k v m) x of None \<Rightarrow> True | Some xa \<Rightarrow> P x xa" for x
using \<open>P k v\<close> A[of x] by (auto simp: lookup_update' split: option.splits)
qed
lemma All_mapping_update:
"P k v \<Longrightarrow> All_mapping m (\<lambda>k' v'. k = k' \<or> P k' v') \<Longrightarrow> All_mapping (Mapping.update k v m) P"
by (simp add: All_mapping_update_iff)
lemma All_mapping_filter_iff: "All_mapping (filter P m) Q \<longleftrightarrow> All_mapping m (\<lambda>k v. P k v \<longrightarrow> Q k v)"
by (auto simp: All_mapping_def lookup_filter split: option.splits)
lemma All_mapping_filter: "All_mapping m Q \<Longrightarrow> All_mapping (filter P m) Q"
by (auto simp: All_mapping_filter_iff intro: All_mapping_mono)
lemma All_mapping_map_values: "All_mapping (map_values f m) P \<longleftrightarrow> All_mapping m (\<lambda>k v. P k (f k v))"
by (auto simp: All_mapping_def lookup_map_values split: option.splits)
lemma All_mapping_tabulate: "(\<forall>x\<in>set xs. P x (f x)) \<Longrightarrow> All_mapping (Mapping.tabulate xs f) P"
unfolding All_mapping_def
apply (intro allI)
apply transfer
apply (auto split: option.split dest!: map_of_SomeD)
done
lemma All_mapping_alist:
"(\<And>k v. (k, v) \<in> set xs \<Longrightarrow> P k v) \<Longrightarrow> All_mapping (Mapping.of_alist xs) P"
by (auto simp: All_mapping_def lookup_of_alist dest!: map_of_SomeD split: option.splits)
lemma combine_empty [simp]: "combine f Mapping.empty y = y" "combine f y Mapping.empty = y"
by (transfer; force)+
lemma (in abel_semigroup) comm_monoid_set_combine: "comm_monoid_set (combine f) Mapping.empty"
by standard (transfer fixing: f, simp add: combine_options_ac[of f] ac_simps)+
locale combine_mapping_abel_semigroup = abel_semigroup
begin
sublocale combine: comm_monoid_set "combine f" Mapping.empty
by (rule comm_monoid_set_combine)
lemma fold_combine_code:
"combine.F g (set xs) = foldr (\<lambda>x. combine f (g x)) (remdups xs) Mapping.empty"
proof -
have "combine.F g (set xs) = foldr (\<lambda>x. combine f (g x)) xs Mapping.empty"
if "distinct xs" for xs
using that by (induction xs) simp_all
from this[of "remdups xs"] show ?thesis by simp
qed
lemma keys_fold_combine: "finite A \<Longrightarrow> Mapping.keys (combine.F g A) = (\<Union>x\<in>A. Mapping.keys (g x))"
by (induct A rule: finite_induct) simp_all
end
subsection \<open>Code generator setup\<close>
hide_const (open) empty is_empty rep lookup lookup_default filter update delete ordered_keys
keys size replace default map_entry map_default tabulate bulkload map map_values combine of_alist
end