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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"
#include "fexpr_builtin.h"
static void
traverse(fexpr_vec_t nodes, const fexpr_t expr)
{
slong i, nargs;
fexpr_t view;
if (fexpr_is_integer(expr))
return;
if (fexpr_is_arithmetic_operation(expr))
{
nargs = fexpr_nargs(expr);
fexpr_view_arg(view, expr, 0);
for (i = 0; i < nargs; i++)
{
traverse(nodes, view);
fexpr_view_next(view);
}
return;
}
if (fexpr_is_builtin_call(expr, FEXPR_Pow) && (fexpr_nargs(expr) == 2))
{
fexpr_t base, exp;
fexpr_view_arg(base, expr, 0);
fexpr_view_arg(exp, expr, 1);
if (fexpr_is_integer(exp))
{
traverse(nodes, base);
return;
}
}
fexpr_vec_insert_unique(nodes, expr);
}
void
fexpr_arithmetic_nodes(fexpr_vec_t nodes, const fexpr_t expr)
{
fexpr_vec_set_length(nodes, 0);
traverse(nodes, expr);
}
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