71 lines
2.4 KiB
C++
71 lines
2.4 KiB
C++
/*
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Copyright (c) 2014 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 "kernel/expr_eq_fn.h"
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namespace lean {
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bool expr_eq_fn::apply(optional<expr> const & a0, optional<expr> const & b0) {
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if (is_eqp(a0, b0))
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return true;
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else if (!a0 || !b0)
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return false;
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else
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return apply(*a0, *b0);
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}
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bool expr_eq_fn::apply(expr const & a, expr const & b) {
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check_system("expression equality test");
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if (is_eqp(a, b)) return true;
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if (a.hash() != b.hash()) return false;
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if (a.kind() != b.kind()) return false;
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if (is_var(a)) return var_idx(a) == var_idx(b);
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if (is_shared(a) && is_shared(b)) {
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auto p = std::make_pair(a.raw(), b.raw());
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if (!m_eq_visited)
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m_eq_visited.reset(new expr_cell_pair_set);
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if (m_eq_visited->find(p) != m_eq_visited->end())
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return true;
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m_eq_visited->insert(p);
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}
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switch (a.kind()) {
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case expr_kind::Var:
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lean_unreachable(); // LCOV_EXCL_LINE
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case expr_kind::Constant:
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return
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const_name(a) == const_name(b) &&
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compare(const_level_params(a), const_level_params(b), [](level const & l1, level const & l2) { return l1 == l2; });
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case expr_kind::Local: case expr_kind::Meta:
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return
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mlocal_name(a) == mlocal_name(b) &&
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apply(mlocal_type(a), mlocal_type(b));
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case expr_kind::App:
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return
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apply(app_fn(a), app_fn(b)) &&
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apply(app_arg(a), app_arg(b));
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case expr_kind::Pair:
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return
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apply(pair_first(a), pair_first(b)) &&
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apply(pair_second(a), pair_second(b)) &&
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apply(pair_type(a), pair_type(b));
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case expr_kind::Fst: case expr_kind::Snd:
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return apply(proj_arg(a), proj_arg(b));
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case expr_kind::Sigma: case expr_kind::Lambda: case expr_kind::Pi:
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return
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apply(binder_domain(a), binder_domain(b)) &&
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apply(binder_body(a), binder_body(b));
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case expr_kind::Sort:
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return sort_level(a) == sort_level(b);
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case expr_kind::Macro:
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return to_macro(a) == to_macro(b);
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case expr_kind::Let:
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return
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apply(let_type(a), let_type(b)) &&
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apply(let_value(a), let_value(b)) &&
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apply(let_body(a), let_body(b));
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}
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lean_unreachable(); // LCOV_EXCL_LINE
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}
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}
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