lean2/src/kernel/for_each_fn.cpp

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/*
Copyright (c) 2013 Microsoft Corporation. All rights reserved.
Released under Apache 2.0 license as described in the file LICENSE.
Author: Leonardo de Moura
*/
#include <utility>
#include "kernel/for_each_fn.h"
namespace lean {
void for_each_fn::apply(expr const & e, unsigned offset) {
buffer<std::pair<expr const &, unsigned>> todo;
todo.emplace_back(e, offset);
while (true) {
begin_loop:
if (todo.empty())
break;
auto p = todo.back();
todo.pop_back();
expr const & e = p.first;
unsigned offset = p.second;
switch (e.kind()) {
case expr_kind::Constant: case expr_kind::Var:
case expr_kind::Sort:
m_f(e, offset);
goto begin_loop;
default:
break;
}
if (is_shared(e)) {
expr_cell_offset p(e.raw(), offset);
if (!m_visited)
m_visited.reset(new expr_cell_offset_set());
if (m_visited->find(p) != m_visited->end())
goto begin_loop;
m_visited->insert(p);
}
if (!m_f(e, offset))
goto begin_loop;
switch (e.kind()) {
case expr_kind::Constant: case expr_kind::Var:
case expr_kind::Sort:
goto begin_loop;
case expr_kind::Meta: case expr_kind::Local:
todo.emplace_back(mlocal_type(e), offset);
goto begin_loop;
case expr_kind::Macro: {
unsigned i = macro_num_args(e);
while (i > 0) {
--i;
todo.emplace_back(macro_arg(e, i), offset);
}
goto begin_loop;
}
case expr_kind::App:
todo.emplace_back(app_arg(e), offset);
todo.emplace_back(app_fn(e), offset);
goto begin_loop;
case expr_kind::Lambda: case expr_kind::Pi:
todo.emplace_back(binding_body(e), offset + 1);
todo.emplace_back(binding_domain(e), offset);
goto begin_loop;
case expr_kind::Let:
todo.emplace_back(let_body(e), offset + 1);
todo.emplace_back(let_value(e), offset);
todo.emplace_back(let_type(e), offset);
goto begin_loop;
}
}
}
}