62 lines
2.2 KiB
C++
62 lines
2.2 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 "kernel/replace_fn.h"
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#include "library/tactic/tactic.h"
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#include "library/tactic/expr_to_tactic.h"
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namespace lean {
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tactic rename_tactic(name const & from, name const & to) {
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return tactic01([=](environment const &, io_state const &, proof_state const & s) -> optional<proof_state> {
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goals const & gs = s.get_goals();
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if (empty(gs)) {
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throw_no_goal_if_enabled(s);
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return none_proof_state();
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}
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goal const & g = head(gs);
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goals const & rest_gs = tail(gs);
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buffer<expr> locals;
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get_app_args(g.get_meta(), locals);
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unsigned i = locals.size();
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optional<expr> from_local;
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while (i > 0) {
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--i;
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expr const & local = locals[i];
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if (local_pp_name(local) == from) {
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from_local = local;
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break;
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}
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}
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if (!from_local)
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return none_proof_state();
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expr to_local = mk_local(mlocal_name(*from_local), to, mlocal_type(*from_local), local_info(*from_local));
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auto fn = [&](expr const & e) {
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if (is_local(e) && mlocal_name(e) == mlocal_name(*from_local))
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return some_expr(to_local);
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else
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return none_expr();
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};
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goal new_g(replace(g.get_meta(), fn), replace(g.get_type(), fn));
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return some(proof_state(s, goals(new_g, rest_gs)));
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});
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}
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static name const & get_rename_arg(expr const & e) {
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return tactic_expr_to_id(e, "invalid 'rename' tactic, arguments must be identifiers");
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}
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void initialize_rename_tactic() {
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auto fn = [](type_checker &, elaborate_fn const &, expr const & e, pos_info_provider const *) {
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return rename_tactic(get_rename_arg(app_arg(app_fn(e))),
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get_rename_arg(app_arg(e)));
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};
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register_tac(get_tactic_rename_name(), fn);
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}
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void finalize_rename_tactic() {
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}
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}
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