0163c1aa5b
We cannot mk_dec_eq_instance everywhere in the init folder because some dec_eq instances are used to define the tactic mk_dec_eq_instance.
47 lines
1.4 KiB
Text
47 lines
1.4 KiB
Text
/-
|
|
Copyright (c) 2016 Microsoft Corporation. All rights reserved.
|
|
Released under Apache 2.0 license as described in the file LICENSE.
|
|
Authors: Leonardo de Moura
|
|
-/
|
|
prelude
|
|
import init.logic init.to_string init.meta.format
|
|
import init.meta.contradiction_tactic init.meta.constructor_tactic
|
|
import init.meta.relation_tactics init.meta.injection_tactic
|
|
|
|
/- We can specify the scope of application of some tactics using
|
|
the following type.
|
|
|
|
- all : all occurrences of a given term are considered.
|
|
|
|
- pos [1, 3] : only the first and third occurrences of a given
|
|
term are consiered.
|
|
|
|
- neg [2] : all but the second occurrence of a given term
|
|
are considered. -/
|
|
inductive occurrences :=
|
|
| all
|
|
| pos : list nat → occurrences
|
|
| neg : list nat → occurrences
|
|
|
|
open occurrences
|
|
|
|
definition occurrences_is_inhabited [instance] : inhabited occurrences :=
|
|
inhabited.mk all
|
|
|
|
definition occurrences_to_string : occurrences → string
|
|
| all := "*"
|
|
| (pos l) := to_string l
|
|
| (neg l) := "-" ++ to_string l
|
|
|
|
definition occurrences_has_to_string [instance] : has_to_string occurrences :=
|
|
has_to_string.mk occurrences_to_string
|
|
|
|
meta_definition occurrences_to_format : occurrences → format
|
|
| all := to_fmt "*"
|
|
| (pos l) := to_fmt l
|
|
| (neg l) := to_fmt "-" ++ to_fmt l
|
|
|
|
meta_definition occurrences_has_to_format [instance] : has_to_format occurrences :=
|
|
has_to_format.mk occurrences_to_format
|
|
|
|
open decidable tactic
|