44 lines
1.5 KiB
C++
44 lines
1.5 KiB
C++
/*
|
|
Copyright (c) 2016 Microsoft Corporation. All rights reserved.
|
|
Released under Apache 2.0 license as described in the file LICENSE.
|
|
|
|
Author: Leonardo de Moura
|
|
*/
|
|
#include "library/vm/vm_expr.h"
|
|
#include "library/tactic/tactic_state.h"
|
|
#include "library/tactic/app_builder_tactics.h"
|
|
|
|
namespace lean {
|
|
vm_obj exact(expr const & e, tactic_state const & s) {
|
|
try {
|
|
optional<metavar_decl> g = s.get_main_goal_decl();
|
|
if (!g) return mk_no_goals_exception(s);
|
|
type_context ctx = mk_type_context_for(s);
|
|
expr e_type = ctx.infer(e);
|
|
if (!ctx.is_def_eq(g->get_type(), e_type)) {
|
|
format r("exact tactic failed, type mismatch, given expression has type");
|
|
unsigned indent = get_pp_indent(s.get_options());
|
|
r += nest(indent, line() + pp_expr(s, e_type));
|
|
r += line() + format("but is expected to have type");
|
|
r += nest(indent, line() + pp_expr(s, g->get_type()));
|
|
return mk_tactic_exception(r, s);
|
|
}
|
|
auto mctx = ctx.mctx();
|
|
mctx.assign(head(s.goals()), e);
|
|
return mk_tactic_success(set_mctx_goals(s, mctx, tail(s.goals())));
|
|
} catch (exception & ex) {
|
|
return mk_tactic_exception(ex, s);
|
|
}
|
|
}
|
|
|
|
vm_obj tactic_exact(vm_obj const & e, vm_obj const & s) {
|
|
return exact(to_expr(e), to_tactic_state(s));
|
|
}
|
|
|
|
void initialize_exact_tactic() {
|
|
DECLARE_VM_BUILTIN(name({"tactic", "exact"}), tactic_exact);
|
|
}
|
|
|
|
void finalize_exact_tactic() {
|
|
}
|
|
}
|