40 lines
1.2 KiB
C++
40 lines
1.2 KiB
C++
/*
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Copyright (c) 2015 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 "kernel/abstract.h"
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#include "kernel/instantiate.h"
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#include "library/blast/blast.h"
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#include "library/blast/proof_expr.h"
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namespace lean {
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namespace blast {
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struct intros_proof_step_cell : public proof_step_cell {
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list<expr> m_new_hs;
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virtual ~intros_proof_step_cell() {}
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virtual optional<expr> resolve(state & s, expr const & pr) const {
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expr new_pr = mk_proof_lambda(s, m_new_hs, unfold_hypotheses_ge(s, pr));
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return some_expr(new_pr);
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}
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};
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bool intros_action() {
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state & s = curr_state();
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expr target = whnf(s.get_target());
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if (!is_pi(target))
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return false;
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auto pcell = new intros_proof_step_cell();
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s.push_proof_step(proof_step(pcell));
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buffer<expr> new_hs;
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while (is_pi(target)) {
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expr href = s.mk_hypothesis(binding_name(target), binding_domain(target));
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new_hs.push_back(href);
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target = whnf(instantiate(binding_body(target), href));
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}
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pcell->m_new_hs = to_list(new_hs);
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s.set_target(target);
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return true;
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}
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}}
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