44 lines
1.5 KiB
C++
44 lines
1.5 KiB
C++
/*
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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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#include "library/constants.h"
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#include "library/reducible.h"
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#include "library/tactic/expr_to_tactic.h"
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#include "library/tactic/elaborate.h"
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#include "library/tactic/whnf_tactic.h"
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namespace lean {
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tactic whnf_tactic() {
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return tactic01([=](environment const & env, io_state const & ios, proof_state const & ps) {
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goals const & gs = ps.get_goals();
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if (empty(gs))
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return none_proof_state();
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name_generator ngen = ps.get_ngen();
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auto tc = mk_type_checker(env, ngen.mk_child());
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goal g = head(gs);
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goals tail_gs = tail(gs);
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expr type = g.get_type();
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auto t_cs = tc->whnf(type);
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goals new_gs(goal(g.get_meta(), t_cs.first), tail_gs);
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proof_state new_ps(ps, new_gs, ngen);
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if (solve_constraints(env, ios, new_ps, t_cs.second)) {
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return some_proof_state(new_ps);
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} else {
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return none_proof_state();
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}
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});
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}
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void initialize_whnf_tactic() {
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register_tac(get_tactic_whnf_name(),
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[](type_checker &, elaborate_fn const &, expr const &, pos_info_provider const *) {
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return whnf_tactic();
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});
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}
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void finalize_whnf_tactic() {
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}
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}
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