49 lines
1.5 KiB
C++
49 lines
1.5 KiB
C++
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/*
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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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namespace lean {
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namespace blast {
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class intros_proof_step_cell : public proof_step_cell {
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list<expr> m_new_hs;
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list<expr> m_new_locals;
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public:
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intros_proof_step_cell(list<expr> const & new_hs, list<expr> const & new_locals):
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m_new_hs(new_hs), m_new_locals(new_locals) {}
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virtual ~intros_proof_step_cell() {}
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virtual optional<expr> resolve(state & s, expr const & pr) {
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buffer<expr> locals;
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to_buffer(m_new_locals, locals);
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expr new_pr = Fun(locals, s.get_main_branch().expand_hrefs(pr, m_new_hs));
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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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branch & b = s.get_main_branch();
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expr target = whnf(b.get_target());
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if (!is_pi(target))
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return false;
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buffer<expr> new_hs;
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buffer<expr> new_locals;
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while (is_pi(target)) {
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expr local = mk_fresh_local(binding_domain(target));
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expr href = b.add_hypothesis(binding_name(target), binding_domain(target), local);
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new_hs.push_back(href);
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new_locals.push_back(local);
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target = whnf(instantiate(binding_body(target), href));
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}
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s.push_proof_step(proof_step(new intros_proof_step_cell(to_list(new_hs), to_list(new_locals))));
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b.set_target(target);
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return true;
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}
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}}
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