Minishell/lexer.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   lexer.c                                            :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: mea <marvin@42.fr>                         +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/05/02 13:44:57 by narnaud           #+#    #+#             */
/*   Updated: 2022/05/12 13:07:38 by narnaud          ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "minishell.h"

static int	create_wc(t_lexer *lex, char *tmp);
static int	check_state(t_lexer *lex, char **line);
static int	create_token(t_lexer *lex, char str[]);
static int	check_register(t_lexer *lex, char **line, char *tmp);

t_token	*lexer(t_datas *datas, char *line)
{
	t_lexer		*lex;
	t_token		*ret;
	char		*tmp;
	int			tmp_i;

	lex = ft_calloc(1, sizeof(*lex));
	lex->state = ROOT_ST;
	tmp = ft_calloc(STR_MAX_SIZE, sizeof(*tmp));
	tmp_i = 0;
	while (*line)
	{
		if (check_state(lex, &line))
			continue ;
		if (lex->state != S_QUOTE_ST && lex->deep == 0 && *line == '$')
			tmp_i = replace_var(datas, &line, tmp, tmp_i);
		else if (check_register(lex, &line, tmp))
			tmp_i = (ft_bzero(tmp, STR_MAX_SIZE), 0);
		else
			tmp[tmp_i++] = *(line++);
	}
	if (lex->type == WORD && lex->wc)
		create_wc(lex, tmp);
	else
		create_token(lex, tmp);
	free(tmp);
	ret = lex->tokens;
	free(lex);
	return (ret);
}

static int	check_state(t_lexer *lex, char **line)
{
	t_state	new;

	new = OLD_ST;
	if (**line == '"' && lex->state == D_QUOTE_ST)
		new = ROOT_ST;
	else if (**line == '"' && lex->state == ROOT_ST)
		new = D_QUOTE_ST;
	else if (**line == '\'' && lex->state == S_QUOTE_ST)
		new = ROOT_ST;
	else if (**line == '\'' && lex->state == ROOT_ST)
		new = S_QUOTE_ST;
	else if (**line == '(' && lex->state == ROOT_ST)
		lex->deep++;
	else if (**line == ')' && lex->state == ROOT_ST)
		lex->deep--;
	else if (**line == '*' && lex->state == ROOT_ST && !lex->deep)
		lex->wc = 1;
	if (new)
	{
		lex->state = new;
		if (lex->deep == 0)
		{
			(*line)++;
			return (1);
		}
	}
	return (0);
}

static int	create_token(t_lexer *lex, char str[])
{
	t_token	*tok;
	t_token	*tmp;
	t_type	type;

	type = lex->type;
	if (lex->next_type)
		lex->type = lex->next_type;
	else
		lex->type = WORD;
	lex->next_type = WORD;
	if (!str[0] && !lex->empty)
		return (0);
	tok = ft_calloc(1, sizeof(*tok));
	tok->type = type;
	tok->value = ft_strdup(str);
	tmp = lex->tokens;
	while (tmp && tmp->next)
		tmp = tmp->next;
	if (!tmp)
		lex->tokens = tok;
	else
		tmp->next = tok;
	lex->empty = 0;
	return (1);
}

static int	check_ope(t_lexer *lex, char **line, char *tmp)
{
	if (!ft_strncmp(*line, "&&", 2))
	{
		(*line) += 2;
		lex->next_type = AND;
		create_token(lex, tmp);
		return (create_token(lex, "&&"));
	}
	if (!ft_strncmp(*line, "||", 2))
	{
		(*line) += 2;
		lex->next_type = OR;
		create_token(lex, tmp);
		return (create_token(lex, "||"));
	}
	if (**line == '|')
	{
		(*line)++;
		lex->next_type = PIPE;
		create_token(lex, tmp);
		return (create_token(lex, "|"));
	}
	return (0);
}

static int	check_register(t_lexer *lex, char **line, char *tmp)
{
	int	spaces;

	if (lex->state != ROOT_ST || lex->deep > 0)
		return (0);
	spaces = 0;
	if (!*tmp && (*(*line - 1) == '"' || *(*line - 1) == '\''))
		lex->empty = 1;
	if (ft_isspace(**line))
	{
		while (ft_isspace(**line))
			(*line)++;
		spaces = 1;
	}
	if (set_redir(lex, line, '>') || set_redir(lex, line, '<'))
		return (create_token(lex, tmp));
	if (check_ope(lex, line, tmp))
		return (1);
	if (**line == '(' || spaces)
	{
		if (**line == '(')
			lex->deep++;
		if (*tmp || lex->empty)
		{
			if (lex->type == WORD && lex->wc)
				return (create_wc(lex, tmp));
			return (create_token(lex, tmp));
		}
	}
	return (0);
}

int create_wc(t_lexer *lex, char *tmp)
{
	int i;
	int	j;
	int	skip ;
	DIR *	direct;
	struct dirent *file;	

	direct = opendir(".");
	file = readdir(direct);
	file = readdir(direct);
	file = readdir(direct);
	while (file)
	{
		i = 0;
		j = 0;
		skip = (tmp[0] != '.' && file->d_name[0] == '.');
		while (tmp[i] && !skip)
		{
			if (tmp[i] == '*')
			{
				while (file->d_name[j] && file->d_name[j] != tmp[i + 1])
					j++;
			}
			if (tmp[i] != '*' && file->d_name[j] != tmp[i])
					skip = 1;
			else
			{
				i++;
				j++;
			}
		}
		if (!skip)
			create_token(lex, file->d_name);
		file = readdir(direct);
	}
	closedir(direct);
	lex->wc = 0;
	return (1);
}