2013-07-30 08:39:29 +00:00
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/*
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Copyright (c) 2013 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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2013-09-13 10:35:29 +00:00
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#include <utility>
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2013-09-13 03:04:10 +00:00
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#include "util/exception.h"
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#include "kernel/context.h"
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2013-07-30 08:39:29 +00:00
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namespace lean {
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2013-09-07 18:11:45 +00:00
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std::pair<context_entry const &, context> context::lookup_ext(unsigned i) const {
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list<context_entry> const * it1 = &m_list;
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2013-07-30 08:39:29 +00:00
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while (*it1) {
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if (i == 0)
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2013-09-07 18:11:45 +00:00
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return std::pair<context_entry const &, context>(head(*it1), context(tail(*it1)));
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2013-08-14 21:42:48 +00:00
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--i;
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it1 = &tail(*it1);
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}
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throw exception("unknown free variable");
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}
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2013-09-07 18:11:45 +00:00
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context_entry const & context::lookup(unsigned i) const {
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list<context_entry> const * it1 = &m_list;
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2013-08-14 21:42:48 +00:00
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while (*it1) {
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if (i == 0)
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return head(*it1);
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2013-07-30 08:39:29 +00:00
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--i;
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it1 = &tail(*it1);
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}
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throw exception("unknown free variable");
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}
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2013-10-22 22:52:24 +00:00
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2013-12-11 17:54:54 +00:00
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optional<context_entry> context::find(unsigned i) const {
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list<context_entry> const * it1 = &m_list;
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while (*it1) {
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if (i == 0)
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return some(head(*it1));
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--i;
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it1 = &tail(*it1);
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}
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return optional<context_entry>();
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}
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2013-10-22 22:52:24 +00:00
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static list<context_entry> remove_core(list<context_entry> const & l, unsigned s, unsigned n) {
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if (s == 0) {
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if (n > 0) {
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return remove_core(tail(l), 0, n-1);
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} else {
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return l;
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}
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} else {
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return cons(head(l), remove_core(tail(l), s-1, n));
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}
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}
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context context::remove(unsigned s, unsigned n) const {
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return context(remove_core(m_list, s, n));
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}
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2013-12-06 12:51:07 +00:00
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static list<context_entry> insert_at_core(list<context_entry> const & l, unsigned i, name const & n, expr const & d) {
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if (i == 0) {
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return cons(context_entry(n, d), l);
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} else {
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lean_assert(l);
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return cons(head(l), insert_at_core(tail(l), i - 1, n, d));
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}
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}
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context context::insert_at(unsigned i, name const & n, expr const & d) const {
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return context(insert_at_core(m_list, i, n, d));
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}
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2013-07-30 08:39:29 +00:00
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}
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