/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   lexing.c                                           :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: lperrey <lperrey@student.42.fr>            +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2021/10/19 08:38:55 by lperrey           #+#    #+#             */
/*   Updated: 2021/12/05 17:11:31 by lperrey          ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "minishell.h"

int				fill_token(t_token *t, char *input, int *i, int *t_i);

static int		tokenize_input(t_token *t, char *input, size_t input_len);

t_token	*lexing(char *input)
{
	t_token	*t_head;
	t_token	*t_tmp;
	size_t	input_len;

	input_len = ft_strlen(input);
	t_head = ft_lstnew_generic(sizeof(t_token), input_len + 1);
	if (!t_head)
		return (ft_retp_perror(NULL, "ft_lstnew_generic() error"));
	if (!tokenize_input(t_head, input, input_len))
		return (ft_lstclear((t_list **)&t_head, free));
	t_tmp = (t_token *)ft_lstbeforelast((t_list *)t_head);
	if (t_tmp && t_tmp->next && !t_tmp->next->id)
	{
		ft_lstdelone((t_list *)t_tmp->next, free);
		t_tmp->next = NULL;
	}
	return (t_head);
}

static int	tokenize_input(t_token *t, char *input, size_t input_len)
{
	int	i;
	int	t_i;

	i = 0;
	t_i = 0;
	while (input[i])
	{
		if (fill_token(t, input, &i, &t_i) == DELIMITE_TOKEN && input[i] && t_i)
		{
			if (!t->id)
				t->id = T_WORD;
			t->next = ft_lstnew_generic(sizeof(t_token), input_len + 1 - i);
			if (!t->next)
				return (ft_reti_perror(0, "ft_lstnew_generic() error"));
			t = t->next;
			t_i = 0;
		}
	}
	if (!t->id && t_i)
		t->id = T_WORD;
	return (1);
}

/*
	2.3 Token Recognition
https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html
#tag_18_03
*/