56 lines
2.9 KiB
Text
56 lines
2.9 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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----------------------------------------------------------------------------------------------------
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import data.string data.num
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-- This is just a trick to embed the 'tactic language' as a
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-- Lean expression. We should view 'tactic' as automation
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-- that when execute produces a term.
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-- tactic.builtin is just a "dummy" for creating the
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-- definitions that are actually implemented in C++
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inductive tactic : Type :=
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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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opaque definition and_then (t1 t2 : tactic) : tactic := builtin
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opaque definition or_else (t1 t2 : tactic) : tactic := builtin
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opaque definition append (t1 t2 : tactic) : tactic := builtin
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opaque definition interleave (t1 t2 : tactic) : tactic := builtin
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opaque definition par (t1 t2 : tactic) : tactic := builtin
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opaque definition fixpoint (f : tactic → tactic) : tactic := builtin
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opaque definition repeat (t : tactic) : tactic := builtin
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opaque definition at_most (t : tactic) (k : num) : tactic := builtin
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opaque definition discard (t : tactic) (k : num) : tactic := builtin
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opaque definition focus_at (t : tactic) (i : num) : tactic := builtin
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opaque definition try_for (t : tactic) (ms : num) : tactic := builtin
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opaque definition now : tactic := builtin
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opaque definition assumption : tactic := builtin
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opaque definition eassumption : tactic := builtin
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opaque definition state : tactic := builtin
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opaque definition fail : tactic := builtin
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opaque definition id : tactic := builtin
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opaque definition beta : tactic := builtin
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opaque definition apply {B : Type} (b : B) : tactic := builtin
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opaque definition unfold {B : Type} (b : B) : tactic := builtin
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opaque definition exact {B : Type} (b : B) : tactic := builtin
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opaque definition trace (s : string) : tactic := builtin
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precedence `;`:200
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infixl ; := and_then
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notation `!` t:max := repeat t
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-- [ t_1 | ... | t_n ] notation
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notation `[` h:100 `|` r:(foldl 100 `|` (e r, or_else r e) h) `]` := r
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-- [ t_1 || ... || t_n ] notation
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notation `[` h:100 `||` r:(foldl 100 `||` (e r, par r e) h) `]` := r
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definition try (t : tactic) : tactic := [ t | id ]
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notation `?` t:max := try t
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definition repeat1 (t : tactic) : tactic := t ; !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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end tactic
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