44 lines
1.3 KiB
C++
44 lines
1.3 KiB
C++
/*
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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 instantiate_with_closed(expr const & e, unsigned n, expr const * s) {
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lean_assert(std::all_of(s, s+n, closed));
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auto f = [=](expr const & e, unsigned offset) -> expr {
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if (is_var(e)) {
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unsigned vidx = var_idx(e);
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if (vidx >= offset) {
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if (vidx < offset + n)
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return s[n - (vidx - offset) - 1];
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else
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return mk_var(vidx - n);
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}
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}
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return e;
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};
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return replace_fn<decltype(f)>(f)(e);
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}
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expr instantiate(expr const & e, unsigned n, expr const * s) {
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auto f = [=](expr const & e, unsigned offset) -> expr {
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if (is_var(e)) {
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unsigned vidx = var_idx(e);
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if (vidx >= offset) {
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if (vidx < offset + n)
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return lift_free_vars(s[n - (vidx - offset) - 1], offset);
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else
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return mk_var(vidx - n);
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}
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}
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return e;
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};
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return replace_fn<decltype(f)>(f)(e);
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}
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}
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