45 lines
1 KiB
C++
45 lines
1 KiB
C++
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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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#include <algorithm>
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#include "free_vars.h"
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#include "replace.h"
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namespace lean {
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expr abstract(unsigned n, expr const * s, expr const & e) {
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lean_assert(std::all_of(s, s+n, closed));
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auto f = [=](expr const & e, unsigned offset) {
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unsigned i = n;
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while (i > 0) {
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--i;
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if (s[i] == e)
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return var(offset + n - i - 1);
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}
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return e;
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};
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replace_proc<decltype(f)> proc(f);
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return proc(e);
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}
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expr abstract_p(unsigned n, expr const * s, expr const & e) {
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lean_assert(std::all_of(s, s+n, closed));
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auto f = [=](expr const & e, unsigned offset) {
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unsigned i = n;
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while (i > 0) {
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--i;
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if (eqp(s[i], e))
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return var(offset + n - i - 1);
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}
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return e;
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};
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replace_proc<decltype(f)> proc(f);
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return proc(e);
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}
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}
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