author | bulwahn |
Wed, 25 Aug 2010 16:59:50 +0200 | |
changeset 38731 | 2c8a595af43e |
parent 38730 | 5bbdd9a9df62 |
child 38733 | 4b8fd91ea59a |
permissions | -rw-r--r-- |
38730 | 1 |
theory Hotel_Example |
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imports Predicate_Compile_Alternative_Defs Code_Prolog |
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begin |
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datatype guest = Guest0 | Guest1 |
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datatype key = Key0 | Key1 | Key2 | Key3 |
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datatype room = Room0 |
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types card = "key * key" |
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datatype event = |
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Check_in guest room card | Enter guest room card | Exit guest room |
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definition initk :: "room \<Rightarrow> key" |
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where "initk = (%r. Key0)" |
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declare initk_def[code_pred_def, code] |
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primrec owns :: "event list \<Rightarrow> room \<Rightarrow> guest option" |
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where |
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"owns [] r = None" |
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| "owns (e#s) r = (case e of |
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Check_in g r' c \<Rightarrow> if r' = r then Some g else owns s r | |
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Enter g r' c \<Rightarrow> owns s r | |
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Exit g r' \<Rightarrow> owns s r)" |
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primrec currk :: "event list \<Rightarrow> room \<Rightarrow> key" |
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where |
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"currk [] r = initk r" |
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| "currk (e#s) r = (let k = currk s r in |
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case e of Check_in g r' (k1, k2) \<Rightarrow> if r' = r then k2 else k |
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| Enter g r' c \<Rightarrow> k |
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| Exit g r \<Rightarrow> k)" |
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primrec issued :: "event list \<Rightarrow> key set" |
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where |
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"issued [] = range initk" |
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| "issued (e#s) = issued s \<union> |
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(case e of Check_in g r (k1, k2) \<Rightarrow> {k2} | Enter g r c \<Rightarrow> {} | Exit g r \<Rightarrow> {})" |
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primrec cards :: "event list \<Rightarrow> guest \<Rightarrow> card set" |
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where |
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"cards [] g = {}" |
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| "cards (e#s) g = (let C = cards s g in |
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case e of Check_in g' r c \<Rightarrow> if g' = g then insert c C |
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else C |
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| Enter g r c \<Rightarrow> C |
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| Exit g r \<Rightarrow> C)" |
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primrec roomk :: "event list \<Rightarrow> room \<Rightarrow> key" |
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where |
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"roomk [] r = initk r" |
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| "roomk (e#s) r = (let k = roomk s r in |
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case e of Check_in g r' c \<Rightarrow> k |
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| Enter g r' (x,y) \<Rightarrow> if r' = r (*& x = k*) then y else k |
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| Exit g r \<Rightarrow> k)" |
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primrec isin :: "event list \<Rightarrow> room \<Rightarrow> guest set" |
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where |
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"isin [] r = {}" |
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| "isin (e#s) r = (let G = isin s r in |
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case e of Check_in g r c \<Rightarrow> G |
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| Enter g r' c \<Rightarrow> if r' = r then {g} \<union> G else G |
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| Exit g r' \<Rightarrow> if r'=r then G - {g} else G)" |
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primrec hotel :: "event list \<Rightarrow> bool" |
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where |
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"hotel [] = True" |
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| "hotel (e # s) = (hotel s & (case e of |
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Check_in g r (k,k') \<Rightarrow> k = currk s r \<and> k' \<notin> issued s | |
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Enter g r (k,k') \<Rightarrow> (k,k') : cards s g & (roomk s r : {k, k'}) | |
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Exit g r \<Rightarrow> False))" |
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lemma issued_nil: "issued [] = {Key0}" |
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by (auto simp add: initk_def) |
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lemmas issued_simps[code, code_pred_def] = issued_nil issued.simps(2) |
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declare Let_def[code_pred_inline] |
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lemma [code_pred_inline]: "insert == (%y A x. y = x | A x)" |
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by (auto simp add: insert_iff[unfolded mem_def] expand_fun_eq intro!: eq_reflection) |
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lemma [code_pred_inline]: "(op -) == (%A B x. A x \<and> \<not> B x)" |
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by (auto simp add: Diff_iff[unfolded mem_def] expand_fun_eq intro!: eq_reflection) |
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ML {* Code_Prolog.options := {ensure_groundness = true} *} |
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values 10 "{s. hotel s}" |
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38731
2c8a595af43e
invocation of values for prolog execution does not require invocation of code_pred anymore
bulwahn
parents:
38730
diff
changeset
|
91 |
|
2c8a595af43e
invocation of values for prolog execution does not require invocation of code_pred anymore
bulwahn
parents:
38730
diff
changeset
|
92 |
|
38730 | 93 |
end |