72 lines
2.7 KiB
C++
72 lines
2.7 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/reducible.h"
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#include "library/unifier.h"
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#include "library/tactic/elaborate.h"
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namespace lean {
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bool solve_constraints(environment const & env, io_state const & ios, proof_state & ps, constraint_seq const & cs) {
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if (!cs)
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return true;
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unifier_config cfg(ios.get_options());
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buffer<constraint> cs_buffer;
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cs.linearize(cs_buffer);
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to_buffer(ps.get_postponed(), cs_buffer);
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name_generator ngen = ps.get_ngen();
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substitution subst = ps.get_subst();
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unify_result_seq rseq = unify(env, cs_buffer.size(), cs_buffer.data(), ngen.mk_child(), subst, cfg);
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if (auto p = rseq.pull()) {
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substitution new_subst = p->first.first;
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constraints new_postponed = p->first.second;
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ps = proof_state(ps, ps.get_goals(), new_subst, ngen, new_postponed);
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return true;
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} else {
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return false;
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}
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}
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optional<expr> elaborate_with_respect_to(environment const & env, io_state const & ios, elaborate_fn const & elab,
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proof_state & s, expr const & e, optional<expr> const & expected_type) {
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name_generator ngen = s.get_ngen();
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substitution subst = s.get_subst();
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goals const & gs = s.get_goals();
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if (empty(gs))
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return none_expr();
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auto ecs = elab(head(gs), ngen.mk_child(), e);
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expr new_e = ecs.first;
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buffer<constraint> cs;
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to_buffer(ecs.second, cs);
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if (cs.empty() && !expected_type) {
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// easy case: no constraints to be solved
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s = proof_state(s, ngen);
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return some_expr(new_e);
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} else {
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to_buffer(s.get_postponed(), cs);
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if (expected_type) {
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auto tc = mk_type_checker(env, ngen.mk_child());
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auto e_t_cs = tc->infer(new_e);
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expr t = subst.instantiate(*expected_type);
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e_t_cs.second.linearize(cs);
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auto d_cs = tc->is_def_eq(e_t_cs.first, t);
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if (!d_cs.first)
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return none_expr();
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d_cs.second.linearize(cs);
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}
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unifier_config cfg(ios.get_options());
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unify_result_seq rseq = unify(env, cs.size(), cs.data(), ngen.mk_child(), subst, cfg);
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if (auto p = rseq.pull()) {
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substitution new_subst = p->first.first;
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constraints new_postponed = p->first.second;
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new_e = new_subst.instantiate(new_e);
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s = proof_state(s, gs, new_subst, ngen, new_postponed);
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return some_expr(new_e);
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} else {
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return none_expr();
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}
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}
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}
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}
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