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