0d5e346143
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
61 lines
2.3 KiB
C++
61 lines
2.3 KiB
C++
/*
|
|
Copyright (c) 2013 Microsoft Corporation. All rights reserved.
|
|
Released under Apache 2.0 license as described in the file LICENSE.
|
|
|
|
Author: Leonardo de Moura
|
|
*/
|
|
#include "kernel/expr.h"
|
|
#include "library/expr_lt.h"
|
|
|
|
namespace lean {
|
|
bool is_lt(expr const & a, expr const & b, bool use_hash) {
|
|
if (is_eqp(a, b)) return false;
|
|
unsigned wa = get_weight(a);
|
|
unsigned wb = get_weight(b);
|
|
if (wa < wb) return true;
|
|
if (wa > wb) return false;
|
|
if (a.kind() != b.kind()) return a.kind() < b.kind();
|
|
if (use_hash) {
|
|
if (a.hash() < b.hash()) return true;
|
|
if (a.hash() > b.hash()) return false;
|
|
}
|
|
if (a == b) return false;
|
|
switch (a.kind()) {
|
|
case expr_kind::Var:
|
|
return var_idx(a) < var_idx(b);
|
|
case expr_kind::Constant:
|
|
if (const_name(a) != const_name(b))
|
|
return const_name(a) < const_name(b);
|
|
else
|
|
return is_lt(const_levels(a), const_levels(b), use_hash);
|
|
case expr_kind::App:
|
|
if (app_fn(a) != app_fn(b))
|
|
return is_lt(app_fn(a), app_fn(b), use_hash);
|
|
else
|
|
return is_lt(app_arg(a), app_arg(b), use_hash);
|
|
case expr_kind::Lambda: case expr_kind::Pi:
|
|
if (binding_domain(a) != binding_domain(b))
|
|
return is_lt(binding_domain(a), binding_domain(b), use_hash);
|
|
else
|
|
return is_lt(binding_body(a), binding_body(b), use_hash);
|
|
case expr_kind::Sort:
|
|
return is_lt(sort_level(a), sort_level(b), use_hash);
|
|
case expr_kind::Local: case expr_kind::Meta:
|
|
if (mlocal_name(a) != mlocal_name(b))
|
|
return mlocal_name(a) < mlocal_name(b);
|
|
else
|
|
return is_lt(mlocal_type(a), mlocal_type(b), use_hash);
|
|
case expr_kind::Macro:
|
|
if (macro_def(a) != macro_def(b))
|
|
return macro_def(a) < macro_def(b);
|
|
if (macro_num_args(a) != macro_num_args(b))
|
|
return macro_num_args(a) < macro_num_args(b);
|
|
for (unsigned i = 0; i < macro_num_args(a); i++) {
|
|
if (macro_arg(a, i) != macro_arg(b, i))
|
|
return is_lt(macro_arg(a, i), macro_arg(b, i), use_hash);
|
|
}
|
|
return false;
|
|
}
|
|
lean_unreachable(); // LCOV_EXCL_LINE
|
|
}
|
|
}
|