47 lines
1.4 KiB
C++
47 lines
1.4 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 "library/blast/revert.h"
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#include "library/blast/blast.h"
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namespace lean {
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namespace blast {
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struct revert_proof_step_cell : public proof_step_cell {
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list<expr> m_hs;
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revert_proof_step_cell(list<expr> const & hs):m_hs(hs) {}
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virtual ~revert_proof_step_cell() {}
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virtual action_result resolve(expr const & pr) const override {
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expr new_pr = mk_app(pr, m_hs);
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return action_result::solved(new_pr);
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}
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virtual bool is_silent() const override { return true; }
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};
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unsigned revert(hypothesis_idx_buffer_set & hidxs) {
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state & s = curr_state();
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unsigned hidxs_size = hidxs.as_buffer().size();
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for (unsigned i = 0; i < hidxs_size; i++) {
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s.collect_forward_deps(hidxs.as_buffer()[i], hidxs);
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}
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s.sort_hypotheses(hidxs);
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buffer<expr> hs;
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s.to_hrefs(hidxs.as_buffer(), hs);
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expr target = s.get_target();
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expr new_target = s.mk_pi(hs, target);
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s.set_target(new_target);
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s.push_proof_step(new revert_proof_step_cell(to_list(hs)));
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lean_verify(s.del_hypotheses(hidxs.as_buffer()));
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return hidxs.as_buffer().size();
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}
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unsigned revert(buffer<hypothesis_idx> & hidxs) {
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hypothesis_idx_buffer_set _hidxs(hidxs);
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return revert(_hidxs);
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}
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}}
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