lean2/src/kernel/for_each.h

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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
*/
#pragma once
#include "expr.h"
#include "sets.h"
namespace lean {
template<typename F>
class for_each_fn {
expr_cell_offset_set m_visited;
F m_f;
void apply(expr const & e, unsigned offset) {
if (is_shared(e)) {
expr_cell_offset p(e.raw(), offset);
if (m_visited.find(p) != m_visited.end())
return;
m_visited.insert(p);
}
m_f(e, offset);
switch (e.kind()) {
case expr_kind::Constant: case expr_kind::Type: case expr_kind::Value: case expr_kind::Var:
return;
case expr_kind::App:
std::for_each(begin_args(e), end_args(e), [=](expr const & arg){ return apply(arg, offset); });
return;
case expr_kind::Eq:
apply(eq_lhs(e), offset);
apply(eq_rhs(e), offset);
return;
case expr_kind::Lambda:
case expr_kind::Pi:
apply(abst_domain(e), offset);
apply(abst_body(e), offset + 1);
return;
case expr_kind::Let:
apply(let_value(e), offset);
apply(let_body(e), offset + 1);
return;
}
}
public:
for_each_fn(F const & f):m_f(f) {}
void operator()(expr const & e) { apply(e, 0); }
};
}