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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* parser.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: dkaiser <dkaiser@student.42heilbronn.de +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2024/06/29 15:53:29 by dkaiser #+# #+# */
/* Updated: 2024/09/17 15:06:55 by dkaiser ### ########.fr */
/* */
/* ************************************************************************** */
#include "minishell.h"
#include "token.h"
static t_token *find_token_by_type(t_token *tokens, int type);
t_token *split_at_first(t_token **tokens, int type);
static t_node *parse_statement(t_token *tokens);
static void free_node_wrapper(void *node);
t_list *parse(t_token *tokens)
{
t_list *result;
t_list *current;
t_token *current_tokens;
result = NULL;
current_tokens = split_at_first(&tokens, NEWLINE_TOKEN);
while (current_tokens != NULL)
{
if (result == NULL)
{
current = ft_lstnew(parse_statement(current_tokens));
result = current;
}
else
{
current->next = ft_lstnew(parse_statement(current_tokens));
current = current->next;
}
if (current == NULL)
return (ft_lstclear(&result, free_node_wrapper), NULL);
current_tokens = split_at_first(&tokens, NEWLINE_TOKEN);
}
return (result);
}
static t_node *parse_statement(t_token *tokens)
{
t_token *left_side_tokens;
left_side_tokens = split_at_first(&tokens, PIPE_TOKEN);
if (left_side_tokens == NULL)
{
free_tokens(tokens);
printf("Parsing error.\n");
return (NULL);
}
else if (tokens != NULL)
{
return (new_pipe_node(parse_cmd(left_side_tokens),
parse_statement(tokens)));
}
else
{
return (parse_cmd(left_side_tokens));
}
}
t_token *split_at_first(t_token **tokens, int type)
{
t_token *split;
t_token *result;
split = find_token_by_type(*tokens, type);
if (split == NULL)
{
result = *tokens;
*tokens = NULL;
return (result);
}
result = *tokens;
*tokens = split->next;
if (result == split)
result = NULL;
free_token(split);
return (result);
}
static t_token *find_token_by_type(t_token *tokens, int type)
{
while (tokens != NULL)
{
if (tokens->type == type)
return (tokens);
tokens = tokens->next;
}
return (NULL);
}
static void free_node_wrapper(void *node)
{
free_node((t_node *)node);
}
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