129 lines
4.3 KiB
C++
129 lines
4.3 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 <algorithm>
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#include "util/sstream.h"
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#include "kernel/abstract.h"
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#include "kernel/instantiate.h"
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#include "library/scoped_ext.h"
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#include "library/locals.h"
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#include "library/explicit.h"
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#include "frontends/lean/parser.h"
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namespace lean {
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void check_atomic(name const & n) {
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if (!n.is_atomic())
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throw exception(sstream() << "invalid declaration name '" << n << "', identifier must be atomic");
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}
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void check_in_section(parser const & p) {
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if (!in_section(p.env()))
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throw exception(sstream() << "invalid command, it must be used in a section");
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}
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static name g_root("_root_");
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bool is_root_namespace(name const & n) {
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return n == g_root;
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}
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name remove_root_prefix(name const & n) {
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return n.replace_prefix(g_root, name());
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}
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// Sort local_names by order of occurrence in the section, and copy the associated parameters to section_ps
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void sort_section_params(expr_struct_set const & locals, parser const & p, buffer<expr> & section_ps) {
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for (expr const & l : locals)
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section_ps.push_back(l);
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std::sort(section_ps.begin(), section_ps.end(), [&](expr const & p1, expr const & p2) {
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return p.get_local_index(mlocal_name(p1)) < p.get_local_index(mlocal_name(p2));
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});
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}
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// Return the levels in \c ls that are defined in the section
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levels collect_section_levels(level_param_names const & ls, parser & p) {
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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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return to_list(section_ls_buffer.begin(), section_ls_buffer.end());
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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<expr> & section_ps) {
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expr_struct_set ls;
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collect_locals(type, ls);
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collect_locals(value, ls);
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sort_section_params(ls, p, section_ps);
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}
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list<expr> locals_to_context(expr const & e, parser const & p) {
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expr_struct_set ls;
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collect_locals(e, ls);
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buffer<expr> locals;
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sort_section_params(ls, p, locals);
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std::reverse(locals.begin(), locals.end());
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return to_list(locals.begin(), locals.end());
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}
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expr Fun(buffer<expr> const & locals, expr const & e, parser & p) {
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return p.rec_save_pos(Fun(locals, e), p.pos_of(e));
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}
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expr Pi(buffer<expr> const & locals, expr const & e, parser & p) {
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return p.rec_save_pos(Pi(locals, e), p.pos_of(e));
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}
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template<bool is_lambda>
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static expr mk_binding_as_is(unsigned num, expr const * locals, expr const & b) {
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expr r = abstract_locals(b, num, locals);
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unsigned i = num;
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while (i > 0) {
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--i;
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expr const & l = locals[i];
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expr t = abstract_locals(mlocal_type(l), i, locals);
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if (is_lambda)
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r = mk_lambda(local_pp_name(l), mk_as_is(t), r, local_info(l));
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else
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r = mk_pi(local_pp_name(l), mk_as_is(t), r, local_info(l));
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}
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return r;
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}
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expr Fun_as_is(buffer<expr> const & locals, expr const & e, parser & p) {
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return p.rec_save_pos(mk_binding_as_is<true>(locals.size(), locals.data(), e), p.pos_of(e));
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}
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expr Pi_as_is(buffer<expr> const & locals, expr const & e, parser & p) {
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return p.rec_save_pos(mk_binding_as_is<false>(locals.size(), locals.data(), e), p.pos_of(e));
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}
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level mk_result_level(environment const & env, buffer<level> const & r_lvls) {
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bool impredicative = env.impredicative();
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if (r_lvls.empty()) {
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return impredicative ? mk_level_one() : mk_level_zero();
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} else {
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level r = r_lvls[0];
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for (unsigned i = 1; i < r_lvls.size(); i++)
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r = mk_max(r, r_lvls[i]);
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r = normalize(r);
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if (is_not_zero(r))
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return normalize(r);
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else
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return impredicative ? normalize(mk_max(r, mk_level_one())) : normalize(r);
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}
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}
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bool occurs(level const & u, level const & l) {
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bool found = false;
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for_each(l, [&](level const & l) {
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if (found) return false;
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if (l == u) { found = true; return false; }
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return true;
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});
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return found;
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}
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}
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