44 lines
1.6 KiB
Text
44 lines
1.6 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: Sebastian Ullrich
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-/
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prelude
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import init.meta.tactic init.meta.rb_map init.meta.has_reflect
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meta constant attribute.get_instances : name → tactic (list name)
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meta constant attribute.fingerprint : name → tactic nat
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structure user_attribute :=
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(name : name)
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(descr : string)
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/- Registers a new user-defined attribute. The argument must be the name of a definition of type
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`user_attribute` or a sub-structure. -/
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meta def attribute.register (decl : name) : command :=
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tactic.set_basic_attribute ``user_attribute decl tt
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meta structure caching_user_attribute (α : Type) extends user_attribute :=
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(mk_cache : list _root_.name → tactic α)
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(dependencies : list _root_.name)
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meta constant caching_user_attribute.get_cache : Π {α : Type}, caching_user_attribute α → tactic α
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open tactic
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meta def register_attribute := attribute.register
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meta def mk_name_set_attr (attr_name : name) : command :=
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do let t := `(caching_user_attribute name_set),
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let v := `({name := attr_name,
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descr := "name_set attribute",
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mk_cache := λ ns, return (name_set.of_list ns),
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dependencies := [] } : caching_user_attribute name_set),
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add_meta_definition attr_name [] t v,
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register_attribute attr_name
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meta def get_name_set_for_attr (attr_name : name) : tactic name_set :=
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do
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cnst ← return (expr.const attr_name []),
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attr ← eval_expr (caching_user_attribute name_set) cnst,
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caching_user_attribute.get_cache attr
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