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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* cmd_optimization.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: dkaiser <dkaiser@student.42heilbronn.de +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2024/04/13 16:42:34 by dkaiser #+# #+# */
/* Updated: 2024/04/27 16:37:28 by dkaiser ### ########.fr */
/* */
/* ************************************************************************** */
#include "push_swap.h"
static enum e_pscmd get_cmd(t_list *cmd)
{
if (cmd)
return (*(enum e_pscmd *)cmd->content);
else
return (NO_CMD);
}
static void set_last(t_list **last, t_list **cur)
{
*last = (*last)->next;
if (*last)
*cur = (*last)->next;
else
*cur = NULL;
}
static void optimize_redundant(t_psdata *data, enum e_pscmd cmd1,
enum e_pscmd cmd2)
{
t_list *cur;
t_list *last;
int optimizations;
cur = data->cmds;
last = ft_lstnew(NULL);
if (!last)
return ;
last->next = cur;
optimizations = 0;
while (cur && cur->next)
{
if ((get_cmd(cur) == cmd1 && get_cmd(cur->next) == cmd2)
|| (get_cmd(cur) == cmd2 && get_cmd(cur->next) == cmd1))
{
last->next = cur->next->next;
ft_lstdelone(cur->next, free);
ft_lstdelone(cur, free);
optimizations++;
}
set_last(&last, &cur);
}
if (optimizations)
optimize_redundant(data, cmd1, cmd2);
}
static void optimize_two_stack_ops(t_psdata *data, enum e_pscmd cmd1,
enum e_pscmd cmd2, enum e_pscmd new_cmd)
{
t_list *cur;
t_list *last;
int optimizations;
cur = data->cmds;
last = ft_lstnew(NULL);
if (!last)
return ;
optimizations = 0;
while (cur && cur->next)
{
if ((get_cmd(cur) == cmd1 && get_cmd(cur->next) == cmd2)
|| (get_cmd(cur) == cmd2 && get_cmd(cur->next) == cmd1))
{
last->next = cur->next;
*(enum e_pscmd *)cur->next->content = new_cmd;
ft_lstdelone(cur, free);
optimizations++;
}
set_last(&last, &cur);
}
if (optimizations)
optimize_two_stack_ops(data, cmd1, cmd2, new_cmd);
}
void optimize_commands(t_psdata *data)
{
optimize_redundant(data, PA, PB);
optimize_redundant(data, RB, RRB);
optimize_two_stack_ops(data, RA, RB, RR);
optimize_two_stack_ops(data, SA, SB, SS);
}
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