lean2/src/library/tactic/rename_tactic.cpp
2014-10-22 17:39:06 -07:00

59 lines
2.1 KiB
C++

/*
Copyright (c) 2014 Microsoft Corporation. All rights reserved.
Released under Apache 2.0 license as described in the file LICENSE.
Author: Leonardo de Moura
*/
#include "kernel/replace_fn.h"
#include "library/tactic/tactic.h"
#include "library/tactic/expr_to_tactic.h"
namespace lean {
tactic rename_tactic(name const & from, name const & to) {
return tactic01([=](environment const &, io_state const &, proof_state const & s) -> optional<proof_state> {
goals const & gs = s.get_goals();
if (empty(gs))
return none_proof_state();
goal const & g = head(gs);
goals const & rest_gs = tail(gs);
buffer<expr> locals;
get_app_args(g.get_meta(), locals);
unsigned i = locals.size();
optional<expr> from_local;
while (i > 0) {
--i;
expr const & local = locals[i];
if (local_pp_name(local) == from) {
from_local = local;
break;
}
}
if (!from_local)
return none_proof_state();
expr to_local = mk_local(mlocal_name(*from_local), to, mlocal_type(*from_local), local_info(*from_local));
auto fn = [&](expr const & e) {
if (is_local(e) && mlocal_name(e) == mlocal_name(*from_local))
return some_expr(to_local);
else
return none_expr();
};
goal new_g(replace(g.get_meta(), fn), replace(g.get_type(), fn));
return some(proof_state(s, goals(new_g, rest_gs)));
});
}
static name const & get_rename_arg(expr const & e) {
return tactic_expr_to_id(e, "invalid 'rename' tactic, arguments must be identifiers");
}
void initialize_rename_tactic() {
auto fn = [](type_checker &, elaborate_fn const &, expr const & e, pos_info_provider const *) {
return rename_tactic(get_rename_arg(app_arg(app_fn(e))),
get_rename_arg(app_arg(e)));
};
register_tac(name({"tactic", "rename"}), fn);
}
void finalize_rename_tactic() {
}
}