50 lines
1.5 KiB
Text
50 lines
1.5 KiB
Text
/-
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Copyright (c) 2016 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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Authors: Leonardo de Moura
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-/
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prelude
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import init.logic init.to_string init.meta.format
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import init.meta.contradiction_tactic init.meta.constructor_tactic
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import init.meta.relation_tactics init.meta.injection_tactic
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/- We can specify the scope of application of some tactics using
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the following type.
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- all : all occurrences of a given term are considered.
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- pos [1, 3] : only the first and third occurrences of a given
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term are consiered.
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- neg [2] : all but the second occurrence of a given term
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are considered. -/
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inductive occurrences
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| all
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| pos : list nat → occurrences
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| neg : list nat → occurrences
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open occurrences
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attribute [instance]
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definition occurrences_is_inhabited : inhabited occurrences :=
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inhabited.mk all
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definition occurrences_to_string : occurrences → string
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| occurrences.all := "*"
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| (occurrences.pos l) := to_string l
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| (occurrences.neg l) := "-" ++ to_string l
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attribute [instance]
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definition occurrences_has_to_string : has_to_string occurrences :=
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has_to_string.mk occurrences_to_string
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meta_definition occurrences_to_format : occurrences → format
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| occurrences.all := to_fmt "*"
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| (occurrences.pos l) := to_fmt l
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| (occurrences.neg l) := to_fmt "-" ++ to_fmt l
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attribute [instance]
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meta_definition occurrences_has_to_format : has_to_format occurrences :=
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has_to_format.mk occurrences_to_format
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open decidable tactic
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