302 lines
11 KiB
C++
302 lines
11 KiB
C++
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/*
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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 <algorithm>
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#include "util/sstream.h"
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#include "kernel/type_checker.h"
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#include "library/scoped_ext.h"
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#include "library/aliases.h"
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#include "library/private.h"
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#include "library/locals.h"
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#include "frontends/lean/parser.h"
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#include "frontends/lean/util.h"
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namespace lean {
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static name g_llevel_curly(".{");
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static name g_rcurly("}");
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static name g_colon(":");
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static name g_assign(":=");
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static name g_private("[private]");
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static name g_inline("[inline]");
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environment universe_cmd(parser & p) {
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name n = p.check_id_next("invalid universe declaration, identifier expected");
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check_atomic(n);
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environment env = p.env();
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if (in_section(env)) {
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p.add_local_level(n, mk_param_univ(n));
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} else {
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name const & ns = get_namespace(env);
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name full_n = ns + n;
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env = module::add_universe(env, full_n);
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if (!ns.is_anonymous())
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env = add_alias(env, n, mk_global_univ(full_n));
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}
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return env;
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}
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void parse_univ_params(parser & p, buffer<name> & ps) {
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if (p.curr_is_token(g_llevel_curly)) {
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p.next();
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while (!p.curr_is_token(g_rcurly)) {
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name l = p.check_id_next("invalid universe parameter, identifier expected");
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p.add_local_level(l, mk_param_univ(l));
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ps.push_back(l);
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}
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p.next();
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}
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}
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void update_parameters(buffer<name> & ls_buffer, name_set const & found, parser const & p) {
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unsigned old_sz = ls_buffer.size();
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found.for_each([&](name const & n) {
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if (std::find(ls_buffer.begin(), ls_buffer.begin() + old_sz, n) == ls_buffer.begin() + old_sz)
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ls_buffer.push_back(n);
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});
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std::sort(ls_buffer.begin(), ls_buffer.end(), [&](name const & n1, name const & n2) {
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return p.get_local_level_index(n1) < p.get_local_level_index(n2);
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});
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}
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static environment declare_var(parser & p, environment env,
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name const & n, level_param_names const & ls, expr const & type,
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bool is_axiom, binder_info const & bi, pos_info const & pos) {
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if (in_section(p.env())) {
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p.add_local_expr(n, p.save_pos(mk_local(n, type), pos), bi);
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return env;
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} else {
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name const & ns = get_namespace(env);
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name full_n = ns + n;
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if (is_axiom)
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env = module::add(env, check(env, mk_axiom(full_n, ls, type)));
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else
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env = module::add(env, check(env, mk_var_decl(full_n, ls, type)));
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if (!ns.is_anonymous())
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env = add_alias(env, n, mk_constant(full_n));
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return env;
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}
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}
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environment variable_cmd_core(parser & p, bool is_axiom, binder_info const & bi) {
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auto pos = p.pos();
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name n = p.check_id_next("invalid declaration, identifier expected");
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check_atomic(n);
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buffer<name> ls_buffer;
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if (p.curr_is_token(g_llevel_curly) && in_section(p.env()))
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throw parser_error("invalid declaration, axioms/parameters occurring in sections cannot be universe polymorphic", p.pos());
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optional<parser::local_scope> scope1;
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if (!in_section(p.env()))
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scope1.emplace(p);
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parse_univ_params(p, ls_buffer);
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parser::param_universe_scope scope2(p);
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expr type;
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if (!p.curr_is_token(g_colon)) {
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buffer<parameter> ps;
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auto lenv = p.parse_binders(ps);
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p.check_token_next(g_colon, "invalid declaration, ':' expected");
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type = p.parse_scoped_expr(ps, lenv);
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type = p.pi_abstract(ps, type);
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} else {
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p.next();
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type = p.parse_expr();
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}
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level_param_names ls;
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if (in_section(p.env())) {
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ls = to_level_param_names(collect_univ_params(type));
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} else {
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update_parameters(ls_buffer, collect_univ_params(type), p);
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ls = to_list(ls_buffer.begin(), ls_buffer.end());
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}
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type = p.elaborate(type, ls);
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return declare_var(p, p.env(), n, ls, type, is_axiom, bi, pos);
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}
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environment variable_cmd(parser & p) {
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return variable_cmd_core(p, false, binder_info());
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}
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environment axiom_cmd(parser & p) {
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return variable_cmd_core(p, true, binder_info());
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}
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environment implicit_variable_cmd(parser & p) {
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check_in_section(p);
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return variable_cmd_core(p, false, mk_implicit_binder_info());
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}
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environment implicit_axiom_cmd(parser & p) {
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check_in_section(p);
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return variable_cmd_core(p, true, mk_implicit_binder_info());
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}
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environment cast_variable_cmd(parser & p) {
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check_in_section(p);
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return variable_cmd_core(p, false, mk_cast_binder_info());
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}
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// Collect local (section) constants occurring in type and value, sort them, and store in section_ps
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void collect_section_locals(expr const & type, expr const & value, parser const & p, buffer<parameter> & section_ps) {
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name_set ls = collect_locals(type, collect_locals(value));
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ls.for_each([&](name const & n) {
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section_ps.push_back(*p.get_local(n));
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});
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std::sort(section_ps.begin(), section_ps.end(), [&](parameter const & p1, parameter const & p2) {
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return p.get_local_index(mlocal_name(p1.m_local)) < p.get_local_index(mlocal_name(p2.m_local));
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});
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}
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static void parse_modifiers(parser & p, bool & is_private, bool & is_opaque) {
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while (true) {
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if (p.curr_is_token(g_private)) {
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is_private = true;
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p.next();
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} else if (p.curr_is_token(g_inline)) {
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is_opaque = false;
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p.next();
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} else {
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break;
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}
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}
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}
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environment definition_cmd_core(parser & p, bool is_theorem, bool is_opaque) {
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bool is_private = false;
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parse_modifiers(p, is_private, is_opaque);
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if (is_theorem && !is_opaque)
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throw exception("invalid theorem declaration, theorems cannot be transparent");
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name n = p.check_id_next("invalid declaration, identifier expected");
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check_atomic(n);
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environment env = p.env();
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name real_n; // real name for this declaration
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if (is_private) {
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auto env_n = add_private_name(env, n, optional<unsigned>(hash(p.pos().first, p.pos().second)));
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env = env_n.first;
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real_n = env_n.second;
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} else {
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name const & ns = get_namespace(env);
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real_n = ns + n;
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}
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buffer<name> ls_buffer;
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expr type, value;
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level_param_names ls;
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{
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parser::local_scope scope1(p);
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parse_univ_params(p, ls_buffer);
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if (!p.curr_is_token(g_colon)) {
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buffer<parameter> ps;
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optional<local_environment> lenv;
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{
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parser::param_universe_scope scope2(p);
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lenv = p.parse_binders(ps);
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p.check_token_next(g_colon, "invalid declaration, ':' expected");
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type = p.parse_scoped_expr(ps, *lenv);
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}
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p.check_token_next(g_assign, "invalid declaration, ':=' expected");
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value = p.parse_scoped_expr(ps, *lenv);
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type = p.pi_abstract(ps, type);
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value = p.lambda_abstract(ps, value);
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} else {
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p.next();
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{
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parser::param_universe_scope scope2(p);
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type = p.parse_expr();
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}
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p.check_token_next(g_assign, "invalid declaration, ':=' expected");
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value = p.parse_expr();
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}
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update_parameters(ls_buffer, collect_univ_params(value, collect_univ_params(type)), p);
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ls = to_list(ls_buffer.begin(), ls_buffer.end());
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}
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if (in_section(env)) {
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buffer<parameter> section_ps;
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collect_section_locals(type, value, p, section_ps);
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type = p.pi_abstract(section_ps, type);
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value = p.lambda_abstract(section_ps, value);
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buffer<level> section_ls_buffer;
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for (name const & l : ls) {
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if (p.get_local_level_index(l))
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section_ls_buffer.push_back(mk_param_univ(l));
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else
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break;
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}
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levels section_ls = to_list(section_ls_buffer.begin(), section_ls_buffer.end());
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buffer<expr> section_args;
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for (auto const & p : section_ps)
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section_args.push_back(p.m_local);
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expr ref = mk_app(mark_explicit(mk_constant(real_n, section_ls)), section_args);
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p.add_local_expr(n, ref);
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} else {
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if (real_n != n)
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env = add_alias(env, n, mk_constant(real_n));
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}
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if (is_theorem) {
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// TODO(Leo): delay theorems
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auto type_value = p.elaborate(type, value, ls);
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type = type_value.first;
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value = type_value.second;
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env = module::add(env, check(env, mk_theorem(real_n, ls, type, value)));
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} else {
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auto type_value = p.elaborate(type, value, ls);
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type = type_value.first;
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value = type_value.second;
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env = module::add(env, check(env, mk_definition(env, real_n, ls, type, value, is_opaque)));
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}
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return env;
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}
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environment definition_cmd(parser & p) {
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return definition_cmd_core(p, false, true);
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}
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environment abbreviation_cmd(parser & p) {
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return definition_cmd_core(p, false, false);
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}
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environment theorem_cmd(parser & p) {
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return definition_cmd_core(p, true, true);
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}
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static environment variables_cmd_core(parser & p, bool is_axiom, binder_info const & bi) {
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auto pos = p.pos();
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buffer<name> ids;
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while (!p.curr_is_token(g_colon)) {
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name id = p.check_id_next("invalid parameters declaration, identifier expected");
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check_atomic(id);
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ids.push_back(id);
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}
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p.next();
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optional<parser::local_scope> scope1;
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if (!in_section(p.env()))
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scope1.emplace(p);
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parser::param_universe_scope scope2(p);
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expr type = p.parse_expr();
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level_param_names ls = to_level_param_names(collect_univ_params(type));
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type = p.elaborate(type, ls);
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environment env = p.env();
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for (auto id : ids)
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env = declare_var(p, env, id, ls, type, is_axiom, bi, pos);
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return env;
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}
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environment variables_cmd(parser & p) {
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return variables_cmd_core(p, false, binder_info());
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}
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environment implicit_variables_cmd(parser & p) {
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check_in_section(p);
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return variables_cmd_core(p, false, mk_implicit_binder_info());
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}
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environment cast_variables_cmd(parser & p) {
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check_in_section(p);
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return variables_cmd_core(p, false, mk_cast_binder_info());
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}
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void register_decl_cmds(cmd_table & r) {
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add_cmd(r, cmd_info("universe", "declare a global universe level", universe_cmd));
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add_cmd(r, cmd_info("variable", "declare a new parameter", variable_cmd));
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add_cmd(r, cmd_info("{variable}", "declare a new implict parameter", implicit_variable_cmd));
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add_cmd(r, cmd_info("[variable]", "declare a new cast parameter", cast_variable_cmd));
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add_cmd(r, cmd_info("axiom", "declare a new axiom", axiom_cmd));
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add_cmd(r, cmd_info("{axiom}", "declare a new implicit axiom", implicit_axiom_cmd));
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add_cmd(r, cmd_info("definition", "add new definition", definition_cmd));
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add_cmd(r, cmd_info("abbreviation", "add new abbreviation (aka transparent definition)", abbreviation_cmd));
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add_cmd(r, cmd_info("theorem", "add new theorem", theorem_cmd));
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add_cmd(r, cmd_info("variables", "declare new parameters", variables_cmd));
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add_cmd(r, cmd_info("{variables}", "declare new implict parameters", implicit_variables_cmd));
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add_cmd(r, cmd_info("[variables]", "declare new cast parameters", cast_variables_cmd));
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}
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}
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