author | blanchet |
Mon, 04 Aug 2014 12:28:42 +0200 | |
changeset 57776 | 1111a9a328fe |
parent 57765 | f1108245ba11 |
child 57792 | 9cb24c835284 |
permissions | -rw-r--r-- |
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(* Title: HOL/Tools/Sledgehammer/sledgehammer_isar_proof.ML |
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Author: Jasmin Blanchette, TU Muenchen |
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Author: Steffen Juilf Smolka, TU Muenchen |
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Basic data structures for representing and basic methods |
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for dealing with Isar proof texts. |
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*) |
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||
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signature SLEDGEHAMMER_ISAR_PROOF = |
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sig |
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type proof_method = Sledgehammer_Proof_Methods.proof_method |
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type label = string * int |
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type facts = label list * string list (* local and global facts *) |
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datatype isar_qualifier = Show | Then |
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datatype isar_proof = |
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Proof of (string * typ) list * (label * term) list * isar_step list |
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and isar_step = |
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Let of term * term | |
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Prove of isar_qualifier list * (string * typ) list * label * term * isar_proof list |
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* facts * proof_method list * string |
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|
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val no_label : label |
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val label_ord : label * label -> order |
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val string_of_label : label -> string |
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val sort_facts : facts -> facts |
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val steps_of_isar_proof : isar_proof -> isar_step list |
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val label_of_isar_step : isar_step -> label option |
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val facts_of_isar_step : isar_step -> facts |
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val proof_methods_of_isar_step : isar_step -> proof_method list |
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val fold_isar_steps : (isar_step -> 'a -> 'a) -> isar_step list -> 'a -> 'a |
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val map_isar_steps : (isar_step -> isar_step) -> isar_proof -> isar_proof |
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val add_isar_steps : isar_step list -> int -> int |
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structure Canonical_Label_Tab : TABLE |
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val canonical_label_ord : (label * label) -> order |
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|
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val comment_isar_proof : (label -> proof_method list -> string) -> isar_proof -> isar_proof |
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val chain_isar_proof : isar_proof -> isar_proof |
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val kill_useless_labels_in_isar_proof : isar_proof -> isar_proof |
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val relabel_isar_proof_canonically : isar_proof -> isar_proof |
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val relabel_isar_proof_nicely : isar_proof -> isar_proof |
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val string_of_isar_proof : Proof.context -> int -> int -> isar_proof -> string |
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end; |
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structure Sledgehammer_Isar_Proof : SLEDGEHAMMER_ISAR_PROOF = |
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struct |
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||
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open ATP_Util |
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open ATP_Proof |
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open ATP_Problem_Generate |
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open ATP_Proof_Reconstruct |
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open Sledgehammer_Util |
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open Sledgehammer_Proof_Methods |
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open Sledgehammer_Isar_Annotate |
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||
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type label = string * int |
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type facts = label list * string list (* local and global facts *) |
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datatype isar_qualifier = Show | Then |
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datatype isar_proof = |
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Proof of (string * typ) list * (label * term) list * isar_step list |
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and isar_step = |
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Let of term * term | |
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Prove of isar_qualifier list * (string * typ) list * label * term * isar_proof list |
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* facts * proof_method list * string |
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|
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val no_label = ("", ~1) |
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(* cf. "label_ord" below *) |
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val assume_prefix = "a" |
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val have_prefix = "f" |
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fun label_ord ((s1, i1), (s2, i2)) = |
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(case int_ord (pairself String.size (s1, s2)) of |
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EQUAL => |
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(case string_ord (s1, s2) of |
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EQUAL => int_ord (i1, i2) |
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| ord => ord (* "assume" before "have" *)) |
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| ord => ord) |
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|
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fun string_of_label (s, num) = s ^ string_of_int num |
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(* Put the nearest local label first, since it's the most likely to be replaced by a "hence". |
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(Some preplaying proof methods, e.g. "blast", react poorly to fact reorderings.) *) |
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fun sort_facts (lfs, gfs) = (sort (label_ord o swap) lfs, sort string_ord gfs) |
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fun steps_of_isar_proof (Proof (_, _, steps)) = steps |
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split isar_step into isar_step, fix, assms; made isar_proof explicit; register fixed variables in ctxt and auto_fix terms to avoid superfluous annotations
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parents:
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fun label_of_isar_step (Prove (_, _, l, _, _, _, _, _)) = SOME l |
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| label_of_isar_step _ = NONE |
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fun subproofs_of_isar_step (Prove (_, _, _, _, subs, _, _, _)) = subs |
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| subproofs_of_isar_step _ = [] |
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fun facts_of_isar_step (Prove (_, _, _, _, _, facts, _, _)) = facts |
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| facts_of_isar_step _ = ([], []) |
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||
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fun proof_methods_of_isar_step (Prove (_, _, _, _, _, _, meths, _)) = meths |
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| proof_methods_of_isar_step _ = [] |
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parents:
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fun fold_isar_step f step = |
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fold (steps_of_isar_proof #> fold_isar_steps f) (subproofs_of_isar_step step) #> f step |
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and fold_isar_steps f = fold (fold_isar_step f) |
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fun map_isar_steps f = |
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let |
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fun map_proof (Proof (fix, assms, steps)) = Proof (fix, assms, map map_step steps) |
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and map_step (step as Let _) = f step |
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| map_step (Prove (qs, xs, l, t, subs, facts, meths, comment)) = |
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f (Prove (qs, xs, l, t, map map_proof subs, facts, meths, comment)) |
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in map_proof end |
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val add_isar_steps = fold_isar_steps (fn Prove _ => Integer.add 1 | _ => I) |
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(* canonical proof labels: 1, 2, 3, ... in post traversal order *) |
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fun canonical_label_ord (((_, i1), (_, i2)) : label * label) = int_ord (i1, i2) |
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structure Canonical_Label_Tab = Table( |
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type key = label |
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val ord = canonical_label_ord) |
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fun comment_isar_step comment_of (Prove (qs, xs, l, t, subs, facts, meths, _)) = |
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Prove (qs, xs, l, t, subs, facts, meths, comment_of l meths) |
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| comment_isar_step _ step = step |
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fun comment_isar_proof comment_of = map_isar_steps (comment_isar_step comment_of) |
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||
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fun chain_qs_lfs NONE lfs = ([], lfs) |
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| chain_qs_lfs (SOME l0) lfs = |
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if member (op =) lfs l0 then ([Then], remove (op =) l0 lfs) else ([], lfs) |
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fun chain_isar_step lbl (Prove (qs, xs, l, t, subs, (lfs, gfs), meths, comment)) = |
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let val (qs', lfs) = chain_qs_lfs lbl lfs in |
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Prove (qs' @ qs, xs, l, t, map chain_isar_proof subs, (lfs, gfs), meths, comment) |
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end |
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| chain_isar_step _ step = step |
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and chain_isar_steps _ [] = [] |
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| chain_isar_steps prev (i :: is) = |
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chain_isar_step prev i :: chain_isar_steps (label_of_isar_step i) is |
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and chain_isar_proof (Proof (fix, assms, steps)) = |
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Proof (fix, assms, chain_isar_steps (try (List.last #> fst) assms) steps) |
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||
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fun kill_useless_labels_in_isar_proof proof = |
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let |
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val used_ls = |
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fold_isar_steps (facts_of_isar_step #> fst #> union (op =)) (steps_of_isar_proof proof) [] |
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fun kill_label l = if member (op =) used_ls l then l else no_label |
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||
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fun kill_step (Prove (qs, xs, l, t, subs, facts, meths, comment)) = |
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Prove (qs, xs, kill_label l, t, map kill_proof subs, facts, meths, comment) |
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| kill_step step = step |
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and kill_proof (Proof (fix, assms, steps)) = |
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Proof (fix, map (apfst kill_label) assms, map kill_step steps) |
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in |
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kill_proof proof |
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end |
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||
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fun relabel_isar_proof_canonically proof = |
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let |
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fun next_label l (next, subst) = |
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let val l' = ("", next) in (l', (next + 1, (l, l') :: subst)) end |
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fun relabel_step (Prove (qs, fix, l, t, subs, (lfs, gfs), meths, comment)) |
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(accum as (_, subst)) = |
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let |
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val lfs' = maps (the_list o AList.lookup (op =) subst) lfs |
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val ((subs', l'), accum') = accum |
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|> fold_map relabel_proof subs |
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||>> next_label l |
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in |
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(Prove (qs, fix, l', t, subs', (lfs', gfs), meths, comment), accum') |
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end |
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| relabel_step step accum = (step, accum) |
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and relabel_proof (Proof (fix, assms, steps)) = |
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fold_map (fn (l, t) => next_label l #> apfst (rpair t)) assms |
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##>> fold_map relabel_step steps |
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#>> (fn (assms, steps) => Proof (fix, assms, steps)) |
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187 |
in |
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fst (relabel_proof proof (0, [])) |
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end |
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|
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val relabel_isar_proof_nicely = |
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let |
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fun next_label depth prefix l (accum as (next, subst)) = |
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if l = no_label then |
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(l, accum) |
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else |
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let val l' = (replicate_string (depth + 1) prefix, next) in |
|
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(l', (next + 1, (l, l') :: subst)) |
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end |
200 |
||
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fun relabel_step depth (Prove (qs, xs, l, t, subs, (lfs, gfs), meths, comment)) |
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(accum as (_, subst)) = |
|
55220 | 203 |
let |
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val lfs' = maps (the_list o AList.lookup (op =) subst) lfs |
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val (l', accum' as (_, subst')) = next_label depth have_prefix l accum |
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val subs' = map (relabel_proof subst' (depth + 1)) subs |
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in |
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(Prove (qs, xs, l', t, subs', (lfs', gfs), meths, comment), accum') |
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end |
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| relabel_step _ step accum = (step, accum) |
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and relabel_proof subst depth (Proof (fix, assms, steps)) = |
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(1, subst) |
213 |
|> fold_map (fn (l, t) => next_label depth assume_prefix l #> apfst (rpair t)) assms |
|
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||>> fold_map (relabel_step depth) steps |
|
215 |
|> (fn ((assms, steps), _) => Proof (fix, assms, steps)) |
|
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in |
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relabel_proof [] 0 |
|
218 |
end |
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219 |
||
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val indent_size = 2 |
221 |
||
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fun string_of_isar_proof ctxt0 i n proof = |
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let |
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(* Make sure only type constraints inserted by the type annotation code are printed. *) |
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val ctxt = ctxt0 |
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|> Config.put show_markup false |
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|> Config.put Printer.show_type_emphasis false |
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|> Config.put show_types false |
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|> Config.put show_sorts false |
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|> Config.put show_consts false |
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|
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fun add_str s' = apfst (suffix s') |
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fun of_indent ind = replicate_string (ind * indent_size) " " |
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fun of_moreover ind = of_indent ind ^ "moreover\n" |
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fun of_label l = if l = no_label then "" else string_of_label l ^ ": " |
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||
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fun of_obtain qs nr = |
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(if nr > 1 orelse (nr = 1 andalso member (op =) qs Then) then "ultimately " |
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else if nr = 1 orelse member (op =) qs Then then "then " |
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else "") ^ "obtain" |
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fun of_show_have qs = if member (op =) qs Show then "show" else "have" |
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fun of_thus_hence qs = if member (op =) qs Show then "thus" else "hence" |
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||
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fun of_have qs nr = |
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if nr > 1 orelse (nr = 1 andalso member (op =) qs Then) then "ultimately " ^ of_show_have qs |
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else if nr = 1 orelse member (op =) qs Then then of_thus_hence qs |
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else of_show_have qs |
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||
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fun add_term term (s, ctxt) = |
|
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(s ^ (term |
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|> singleton (Syntax.uncheck_terms ctxt) |
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|> annotate_types_in_term ctxt |
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|> with_vanilla_print_mode (Syntax.unparse_term ctxt #> Pretty.string_of) |
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|> simplify_spaces |
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|> maybe_quote), |
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ctxt |> perhaps (try (Variable.auto_fixes term))) |
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|
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fun using_facts [] [] = "" |
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| using_facts ls ss = enclose "using " " " (space_implode " " (map string_of_label ls @ ss)) |
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|
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(* Local facts are always passed via "using", which affects "meson" and "metis". This is |
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arguably stylistically superior, because it emphasises the structure of the proof. It is also |
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more robust w.r.t. preplay: Preplay is performed before chaining of local facts with "hence" |
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and "thus" is introduced. See also "tac_of_method" in "Sledgehammer_Isar_Preplay". *) |
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fun of_method ls ss meth = |
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let val direct = is_proof_method_direct meth in |
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using_facts ls (if direct then [] else ss) ^ |
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"by " ^ string_of_proof_method ctxt (if direct then ss else []) meth |
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end |
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|
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fun of_free (s, T) = |
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maybe_quote s ^ " :: " ^ |
|
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maybe_quote (simplify_spaces (with_vanilla_print_mode (Syntax.string_of_typ ctxt) T)) |
|
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||
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fun add_frees xs (s, ctxt) = |
|
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(s ^ space_implode " and " (map of_free xs), ctxt |> fold Variable.auto_fixes (map Free xs)) |
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|
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fun add_fix _ [] = I |
|
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| add_fix ind xs = add_str (of_indent ind ^ "fix ") #> add_frees xs #> add_str "\n" |
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|
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fun add_assm ind (l, t) = |
|
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add_str (of_indent ind ^ "assume " ^ of_label l) #> add_term t #> add_str "\n" |
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|
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fun of_subproof ind ctxt proof = |
|
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let |
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val ind = ind + 1 |
|
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val s = of_proof ind ctxt proof |
|
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val prefix = "{ " |
|
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val suffix = " }" |
|
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in |
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replicate_string (ind * indent_size - size prefix) " " ^ prefix ^ |
|
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String.extract (s, ind * indent_size, SOME (size s - ind * indent_size - 1)) ^ |
|
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suffix ^ "\n" |
|
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end |
|
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and of_subproofs _ _ _ [] = "" |
|
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| of_subproofs ind ctxt qs subs = |
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(if member (op =) qs Then then of_moreover ind else "") ^ |
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space_implode (of_moreover ind) (map (of_subproof ind ctxt) subs) |
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and add_step_pre ind qs subs (s, ctxt) = |
|
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(s ^ of_subproofs ind ctxt qs subs ^ of_indent ind, ctxt) |
|
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and add_step ind (Let (t1, t2)) = |
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add_str (of_indent ind ^ "let ") #> add_term t1 #> add_str " = " #> add_term t2 |
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#> add_str "\n" |
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| add_step ind (Prove (qs, xs, l, t, subs, (ls, ss), meth :: _, comment)) = |
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add_step_pre ind qs subs |
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#> (case xs of |
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[] => add_str (of_have qs (length subs) ^ " ") |
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| _ => add_str (of_obtain qs (length subs) ^ " ") #> add_frees xs #> add_str " where ") |
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#> add_str (of_label l) |
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#> add_term t |
|
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#> add_str (" " ^ of_method ls ss meth ^ |
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(if comment = "" then "" else " (* " ^ comment ^ " *)") ^ "\n") |
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and add_steps ind = fold (add_step ind) |
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and of_proof ind ctxt (Proof (xs, assms, steps)) = |
|
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("", ctxt) |
318 |
|> add_fix ind xs |
|
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|> fold (add_assm ind) assms |
|
320 |
|> add_steps ind steps |
|
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|> fst |
|
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in |
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(if i <> 1 then "prefer " ^ string_of_int i ^ "\n" else "") ^ |
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of_indent 0 ^ "proof -\n" ^ of_proof 1 ctxt proof ^ |
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of_indent 0 ^ (if n = 1 then "qed" else "next") |
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end |
327 |
||
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end; |