author | wenzelm |
Fri, 11 May 2007 18:46:50 +0200 | |
changeset 22937 | 08cf9aaf3aa1 |
parent 22926 | fb6917e426da |
child 23034 | b3a6815754d6 |
permissions | -rw-r--r-- |
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Conversions: primitive equality reasoning (from drule.ML);
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(* Title: Pure/conv.ML |
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Conversions: primitive equality reasoning (from drule.ML);
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ID: $Id$ |
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Conversions: primitive equality reasoning (from drule.ML);
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Author: Amine Chaieb and Makarius |
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Conversions: primitive equality reasoning (from drule.ML);
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Conversions: primitive equality reasoning. |
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*) |
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infix 1 then_conv; |
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infix 0 else_conv; |
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signature CONV = |
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sig |
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type conv = cterm -> thm |
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val no_conv: conv |
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val all_conv: conv |
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val then_conv: conv * conv -> conv |
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val else_conv: conv * conv -> conv |
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val first_conv: conv list -> conv |
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val every_conv: conv list -> conv |
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val try_conv: conv -> conv |
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val repeat_conv: conv -> conv |
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val cache_conv: conv -> conv |
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val abs_conv: conv -> conv |
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val combination_conv: conv -> conv -> conv |
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val comb_conv: conv -> conv |
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val arg_conv: conv -> conv |
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val fun_conv: conv -> conv |
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val arg1_conv: conv -> conv |
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val fun2_conv: conv -> conv |
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val forall_conv: int -> conv -> conv |
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val concl_conv: int -> conv -> conv |
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val prems_conv: int -> (int -> conv) -> conv |
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val goals_conv: (int -> bool) -> conv -> conv |
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val fconv_rule: conv -> thm -> thm |
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end; |
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structure Conv: CONV = |
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struct |
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(* conversionals *) |
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type conv = cterm -> thm; |
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fun no_conv _ = raise CTERM ("no conversion", []); |
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val all_conv = Thm.reflexive; |
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val is_refl = op aconv o Logic.dest_equals o Thm.prop_of; |
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fun (cv1 then_conv cv2) ct = |
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let |
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val eq1 = cv1 ct; |
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val eq2 = cv2 (Thm.rhs_of eq1); |
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in |
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if is_refl eq1 then eq2 |
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else if is_refl eq2 then eq1 |
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else Thm.transitive eq1 eq2 |
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end; |
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fun (cv1 else_conv cv2) ct = |
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(case try cv1 ct of SOME eq => eq | NONE => cv2 ct); |
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fun first_conv cvs = fold_rev (curry op else_conv) cvs no_conv; |
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fun every_conv cvs = fold_rev (curry op then_conv) cvs all_conv; |
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fun try_conv cv = cv else_conv all_conv; |
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fun repeat_conv cv ct = try_conv (cv then_conv repeat_conv cv) ct; |
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fun cache_conv cv = |
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let |
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val cache = ref Termtab.empty; |
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fun conv ct = |
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(case Termtab.lookup (! cache) (term_of ct) of |
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SOME th => th |
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| NONE => |
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let val th = cv ct |
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in change cache (Termtab.update (term_of ct, th)); th end); |
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in conv end; |
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(** Pure conversions **) |
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(* lambda terms *) |
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fun abs_conv cv ct = |
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(case term_of ct of |
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Abs (x, _, _) => |
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let val (v, ct') = Thm.dest_abs (SOME (gensym "abs_")) ct |
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in Thm.abstract_rule x v (cv ct') end |
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| _ => raise CTERM ("abs_conv", [ct])); |
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fun combination_conv cv1 cv2 ct = |
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let val (ct1, ct2) = Thm.dest_comb ct |
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in Thm.combination (cv1 ct1) (cv2 ct2) end; |
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fun comb_conv cv = combination_conv cv cv; |
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fun arg_conv cv = combination_conv all_conv cv; |
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fun fun_conv cv = combination_conv cv all_conv; |
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val arg1_conv = fun_conv o arg_conv; |
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val fun2_conv = fun_conv o fun_conv; |
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(* logic *) |
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(*rewrite B in !!x1 ... xn. B*) |
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fun forall_conv 0 cv ct = cv ct |
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| forall_conv n cv ct = |
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(case try Thm.dest_comb ct of |
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NONE => cv ct |
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| SOME (A, B) => |
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(case (term_of A, term_of B) of |
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(Const ("all", _), Abs (x, _, _)) => |
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let val (v, B') = Thm.dest_abs (SOME (gensym "all_")) B in |
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Thm.combination (all_conv A) |
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(Thm.abstract_rule x v (forall_conv (n - 1) cv B')) |
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end |
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| _ => cv ct)); |
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(*rewrite B in A1 ==> ... ==> An ==> B*) |
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fun concl_conv 0 cv ct = cv ct |
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| concl_conv n cv ct = |
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(case try Thm.dest_implies ct of |
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NONE => cv ct |
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| SOME (A, B) => Drule.imp_cong_rule (all_conv A) (concl_conv (n - 1) cv B)); |
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(*rewrite the A's in A1 ==> ... ==> An ==> B*) |
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fun prems_conv 0 _ = all_conv |
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| prems_conv n cv = |
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let |
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fun conv i ct = |
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if i = n + 1 then all_conv ct |
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else |
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(case try Thm.dest_implies ct of |
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NONE => all_conv ct |
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| SOME (A, B) => Drule.imp_cong_rule (cv i A) (conv (i + 1) B)); |
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in conv 1 end; |
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fun goals_conv pred cv = prems_conv ~1 (fn i => if pred i then cv else all_conv); |
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fun fconv_rule cv th = equal_elim (cv (cprop_of th)) th; |
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end; |