45 lines
1.4 KiB
C++
45 lines
1.4 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 "context.h"
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#include "exception.h"
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namespace lean {
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std::pair<context_entry const &, context const &> lookup_ext(context const & c, unsigned i) {
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context const * it1 = &c;
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while (*it1) {
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if (i == 0)
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return std::pair<context_entry const &, context const &>(head(*it1), tail(*it1));
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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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context_entry const & lookup(context const & c, unsigned i) {
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context const * it1 = &c;
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while (*it1) {
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if (i == 0)
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return head(*it1);
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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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/**
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\brief Return a new context where the names used in the context
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entries of \c c do not shadow constants occurring in \c c and \c es[sz].
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Recall that the names in context entries are just "suggestions".
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These names are used to name free variables in \c es[sz] (and
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dependent entries in \c c).
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*/
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context sanitize_names(context const & c, unsigned sz, expr const * es);
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inline context sanitize_names(context const & c, expr const & e) { return sanitize_names(c, 1, &e); }
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inline context sanitize_names(context const & c, std::initializer_list<expr> const & l) { return sanitize_names(c, l.size(), l.begin()); }
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}
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