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/*
Copyright (C) 2021 Fredrik Johansson
This file is part of Calcium.
Calcium is free software: you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License (LGPL) as published
by the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version. See <http://www.gnu.org/licenses/>.
*/
#include "fexpr.h"
int
fexpr_contains(const fexpr_t expr, const fexpr_t x)
{
fexpr_t func, arg;
slong expr_size, x_size, i, nargs;
expr_size = fexpr_size(expr);
x_size = fexpr_size(x);
if (expr_size < x_size)
return 0;
if (expr_size == x_size)
return _mpn_equal(expr->data, x->data, x_size);
nargs = fexpr_nargs(expr);
if (nargs < 0)
return 0;
fexpr_view_func(func, expr);
if (fexpr_contains(func, x))
return 1;
if (nargs <= 0)
return 0;
fexpr_view_arg(arg, expr, 0);
for (i = 0; i < nargs; i++)
{
if (fexpr_contains(arg, x))
return 1;
if (i < nargs - 1)
fexpr_view_next(arg);
}
return 0;
}
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