170 lines
6.8 KiB
C++
170 lines
6.8 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 "kernel/instantiate.h"
|
|
#include "kernel/abstract.h"
|
|
#include "library/lazy_abstraction.h"
|
|
#include "library/vm/vm_name.h"
|
|
#include "library/vm/vm_nat.h"
|
|
#include "library/vm/vm_expr.h"
|
|
#include "library/tactic/tactic_state.h"
|
|
|
|
namespace lean {
|
|
static name mk_aux_name(list<name> & given_names, name const & default_name) {
|
|
if (given_names) {
|
|
name r = head(given_names);
|
|
given_names = tail(given_names);
|
|
return r;
|
|
} else {
|
|
return default_name;
|
|
}
|
|
}
|
|
|
|
optional<expr> intron(environment const & env, options const & opts, metavar_context & mctx,
|
|
expr const & mvar, unsigned n, list<name> & given_names, buffer<name> & new_Hns) {
|
|
lean_assert(is_metavar(mvar));
|
|
optional<metavar_decl> g = mctx.get_metavar_decl(mvar);
|
|
if (!g) return none_expr();
|
|
type_context ctx = mk_type_context_for(env, opts, mctx, g->get_context());
|
|
expr type = g->get_type();
|
|
type_context::tmp_locals new_locals(ctx);
|
|
buffer<expr> new_Hs;
|
|
for (unsigned i = 0; i < n; i++) {
|
|
if (!is_pi(type) && !is_let(type)) {
|
|
type = ctx.whnf(type);
|
|
if (!is_pi(type))
|
|
return none_expr();
|
|
}
|
|
lean_assert(is_pi(type) || is_let(type));
|
|
if (is_pi(type)) {
|
|
expr H = new_locals.push_local(mk_aux_name(given_names, binding_name(type)), binding_domain(type),
|
|
binding_info(type));
|
|
type = instantiate(binding_body(type), H);
|
|
new_Hs.push_back(H);
|
|
new_Hns.push_back(mlocal_name(H));
|
|
|
|
} else {
|
|
lean_assert(is_let(type));
|
|
expr H = new_locals.push_let(mk_aux_name(given_names, let_name(type)), let_type(type), let_value(type));
|
|
type = instantiate(let_body(type), H);
|
|
new_Hs.push_back(H);
|
|
new_Hns.push_back(mlocal_name(H));
|
|
}
|
|
}
|
|
expr new_M = ctx.mk_metavar_decl(ctx.lctx(), type);
|
|
expr new_val = abstract_locals(mk_lazy_abstraction_with_locals(new_M, new_Hs), new_Hs.size(), new_Hs.data());
|
|
unsigned i = new_Hs.size();
|
|
while (i > 0) {
|
|
--i;
|
|
optional<local_decl> d = ctx.lctx().get_local_decl(new_Hs[i]);
|
|
expr type = d->get_type();
|
|
type = abstract_locals(type, i, new_Hs.data());
|
|
if (auto letval = d->get_value()) {
|
|
letval = abstract_locals(*letval, i, new_Hs.data());
|
|
new_val = mk_let(d->get_pp_name(), type, *letval, new_val);
|
|
} else {
|
|
new_val = mk_lambda(d->get_pp_name(), type, new_val, d->get_info());
|
|
}
|
|
}
|
|
lean_assert(!ctx.mctx().is_assigned(new_M));
|
|
mctx = ctx.mctx();
|
|
mctx.assign(mvar, new_val);
|
|
return some_expr(new_M);
|
|
}
|
|
|
|
optional<expr> intron(environment const & env, options const & opts, metavar_context & mctx,
|
|
expr const & mvar, unsigned n, list<name> & given_names) {
|
|
buffer<name> tmp;
|
|
return intron(env, opts, mctx, mvar, n, given_names, tmp);
|
|
}
|
|
|
|
optional<expr> intron(environment const & env, options const & opts, metavar_context & mctx,
|
|
expr const & mvar, unsigned n) {
|
|
list<name> empty;
|
|
return intron(env, opts, mctx, mvar, n, empty);
|
|
}
|
|
|
|
optional<expr> intron(environment const & env, options const & opts, metavar_context & mctx,
|
|
expr const & mvar, unsigned n, buffer<name> & new_Hns) {
|
|
list<name> empty;
|
|
return intron(env, opts, mctx, mvar, n, empty, new_Hns);
|
|
}
|
|
|
|
optional<tactic_state> intron(unsigned n, tactic_state const & s, buffer<name> & new_Hns) {
|
|
if (n == 0) return some_tactic_state(s);
|
|
optional<expr> mvar = s.get_main_goal();
|
|
if (!mvar) return none_tactic_state();
|
|
list<name> new_names;
|
|
metavar_context mctx = s.mctx();
|
|
if (optional<expr> new_M = intron(s.env(), s.get_options(), mctx, *mvar, n, new_names, new_Hns)) {
|
|
list<expr> new_gs(*new_M, tail(s.goals()));
|
|
return some_tactic_state(set_mctx_goals(s, mctx, new_gs));
|
|
} else {
|
|
return none_tactic_state();
|
|
}
|
|
}
|
|
|
|
optional<tactic_state> intron(unsigned n, tactic_state const & s) {
|
|
buffer<name> tmp;
|
|
return intron(n, s, tmp);
|
|
}
|
|
|
|
vm_obj tactic_intron(vm_obj const & num, vm_obj const & s) {
|
|
optional<metavar_decl> g = to_tactic_state(s).get_main_goal_decl();
|
|
if (!g) return mk_no_goals_exception(to_tactic_state(s));
|
|
buffer<name> new_Hs;
|
|
if (auto new_s = intron(force_to_unsigned(num, 0), to_tactic_state(s), new_Hs))
|
|
return mk_tactic_success(*new_s);
|
|
else
|
|
return mk_tactic_exception("intron tactic failed, insufficient binders", to_tactic_state(s));
|
|
}
|
|
|
|
vm_obj intro(name const & n, tactic_state const & s) {
|
|
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 type = g->get_type();
|
|
if (!is_pi(type) && !is_let(type)) {
|
|
type = ctx.whnf(type);
|
|
if (!is_pi(type))
|
|
return mk_tactic_exception("intro tactic failed, Pi/let expression expected", s);
|
|
}
|
|
local_context lctx = g->get_context();
|
|
metavar_context mctx = ctx.mctx();
|
|
if (is_pi(type)) {
|
|
name n1 = n == "_" ? binding_name(type) : n;
|
|
expr H = lctx.mk_local_decl(n1, binding_domain(type), binding_info(type));
|
|
expr new_type = instantiate(binding_body(type), H);
|
|
expr new_M = mctx.mk_metavar_decl(lctx, new_type);
|
|
expr new_val = mk_lambda(n1, binding_domain(type), mk_lazy_abstraction(new_M, mlocal_name(H)));
|
|
mctx.assign(head(s.goals()), new_val);
|
|
list<expr> new_gs(new_M, tail(s.goals()));
|
|
return mk_tactic_success(to_obj(H), set_mctx_goals(s, mctx, new_gs));
|
|
} else {
|
|
lean_assert(is_let(type));
|
|
name n1 = n == "_" ? let_name(type) : n;
|
|
expr H = lctx.mk_local_decl(n1, let_type(type), let_value(type));
|
|
expr new_type = instantiate(let_body(type), H);
|
|
expr new_M = mctx.mk_metavar_decl(lctx, new_type);
|
|
expr new_val = mk_let(n1, let_type(type), let_value(type), mk_lazy_abstraction(new_M, mlocal_name(H)));
|
|
mctx.assign(head(s.goals()), new_val);
|
|
list<expr> new_gs(new_M, tail(s.goals()));
|
|
return mk_tactic_success(to_obj(H), set_mctx_goals(s, mctx, new_gs));
|
|
}
|
|
}
|
|
|
|
vm_obj tactic_intro(vm_obj const & n, vm_obj const & s) {
|
|
return intro(to_name(n), to_tactic_state(s));
|
|
}
|
|
|
|
void initialize_intro_tactic() {
|
|
DECLARE_VM_BUILTIN(name({"tactic", "intro"}), tactic_intro);
|
|
DECLARE_VM_BUILTIN(name({"tactic", "intron"}), tactic_intron);
|
|
}
|
|
|
|
void finalize_intro_tactic() {
|
|
}
|
|
}
|