lean2/hott/init/tactic.hlean
Leonardo de Moura 415ca2b93f feat(library/tactic): add 'congruence' tactic
It is the f_equal described at issue #500.
2015-05-02 12:58:46 -07:00

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/-
Copyright (c) 2014 Microsoft Corporation. All rights reserved.
Released under Apache 2.0 license as described in the file LICENSE.
Module: init.tactic
Author: Leonardo de Moura
This is just a trick to embed the 'tactic language' as a Lean
expression. We should view 'tactic' as automation that when execute
produces a term. tactic.builtin is just a "dummy" for creating the
definitions that are actually implemented in C++
-/
prelude
import init.datatypes init.reserved_notation init.num
inductive tactic :
Type := builtin : tactic
namespace tactic
-- Remark the following names are not arbitrary, the tactic module
-- uses them when converting Lean expressions into actual tactic objects.
-- The bultin 'by' construct triggers the process of converting a
-- a term of type 'tactic' into a tactic that sythesizes a term
opaque definition and_then (t1 t2 : tactic) : tactic := builtin
opaque definition or_else (t1 t2 : tactic) : tactic := builtin
opaque definition append (t1 t2 : tactic) : tactic := builtin
opaque definition interleave (t1 t2 : tactic) : tactic := builtin
opaque definition par (t1 t2 : tactic) : tactic := builtin
opaque definition fixpoint (f : tactic → tactic) : tactic := builtin
opaque definition repeat (t : tactic) : tactic := builtin
opaque definition at_most (t : tactic) (k : num) : tactic := builtin
opaque definition discard (t : tactic) (k : num) : tactic := builtin
opaque definition focus_at (t : tactic) (i : num) : tactic := builtin
opaque definition try_for (t : tactic) (ms : num) : tactic := builtin
opaque definition all_goals (t : tactic) : tactic := builtin
opaque definition now : tactic := builtin
opaque definition assumption : tactic := builtin
opaque definition eassumption : tactic := builtin
opaque definition state : tactic := builtin
opaque definition fail : tactic := builtin
opaque definition id : tactic := builtin
opaque definition beta : tactic := builtin
opaque definition info : tactic := builtin
opaque definition whnf : tactic := builtin
opaque definition contradiction : tactic := builtin
opaque definition exfalso : tactic := builtin
opaque definition congruence : tactic := builtin
opaque definition rotate_left (k : num) := builtin
opaque definition rotate_right (k : num) := builtin
definition rotate (k : num) := rotate_left k
-- This is just a trick to embed expressions into tactics.
-- The nested expressions are "raw". They tactic should
-- elaborate them when it is executed.
inductive expr : Type :=
builtin : expr
inductive expr_list : Type :=
| nil : expr_list
| cons : expr → expr_list → expr_list
-- auxiliary type used to mark optional list of arguments
definition opt_expr_list := expr_list
-- auxiliary types used to mark that the expression (list) is an identifier (list)
definition identifier := expr
definition identifier_list := expr_list
definition opt_identifier_list := expr_list
opaque definition apply (e : expr) : tactic := builtin
opaque definition eapply (e : expr) : tactic := builtin
opaque definition fapply (e : expr) : tactic := builtin
opaque definition rename (a b : identifier) : tactic := builtin
opaque definition intro (e : identifier_list) : tactic := builtin
opaque definition generalize_tac (e : expr) (id : identifier) : tactic := builtin
opaque definition clear (e : identifier_list) : tactic := builtin
opaque definition revert (e : identifier_list) : tactic := builtin
opaque definition refine (e : expr) : tactic := builtin
opaque definition exact (e : expr) : tactic := builtin
-- Relaxed version of exact that does not enforce goal type
opaque definition rexact (e : expr) : tactic := builtin
opaque definition check_expr (e : expr) : tactic := builtin
opaque definition trace (s : string) : tactic := builtin
-- rewrite_tac is just a marker for the builtin 'rewrite' notation
-- used to create instances of this tactic.
opaque definition rewrite_tac (e : expr_list) : tactic := builtin
opaque definition cases (id : identifier) (ids : opt_identifier_list) : tactic := builtin
opaque definition intros (ids : opt_identifier_list) : tactic := builtin
opaque definition generalizes (es : expr_list) : tactic := builtin
opaque definition clears (ids : identifier_list) : tactic := builtin
opaque definition reverts (ids : identifier_list) : tactic := builtin
opaque definition change (e : expr) : tactic := builtin
opaque definition assert_hypothesis (id : identifier) (e : expr) : tactic := builtin
opaque definition lettac (id : identifier) (e : expr) : tactic := builtin
opaque definition constructor (k : option num) : tactic := builtin
opaque definition existsi (e : expr) : tactic := builtin
opaque definition split : tactic := builtin
opaque definition left : tactic := builtin
opaque definition right : tactic := builtin
opaque definition injection (e : expr) (ids : opt_identifier_list) : tactic := builtin
opaque definition subst (ids : identifier_list) : tactic := builtin
definition try (t : tactic) : tactic := or_else t id
definition repeat1 (t : tactic) : tactic := and_then t (repeat t)
definition focus (t : tactic) : tactic := focus_at t 0
definition determ (t : tactic) : tactic := at_most t 1
definition trivial : tactic := or_else (apply eq.refl) assumption
definition do (n : num) (t : tactic) : tactic :=
nat.rec id (λn t', and_then t t') (nat.of_num n)
end tactic
tactic_infixl `;`:15 := tactic.and_then
tactic_notation `(` h `|` r:(foldl `|` (e r, tactic.or_else r e) h) `)` := r