Minishell/lexer.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   lexer.c                                            :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: mea <marvin@42.fr>                         +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/05/02 13:44:57 by narnaud           #+#    #+#             */
/*   Updated: 2022/05/06 11:19:26 by narnaud          ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "minishell.h"

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])
		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;
	return (1);
}

int	set_redir(t_lexer *lex, char **line, char ch)
{
	static t_type	type_out[2] = {ADD, OUT};
	static t_type	type_in[2] = {IN, HD};
	t_type	*type;

	if (ch == '>')
		type = type_out;
	else
		type = type_in;
	if (**line == ch && (*line)++)
	{
		if (**line == ch && (*line)++)
			lex->next_type = type[0];
		else
			lex->next_type = type[1];
		return (1);
	}
	return (0);	
}

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

	if (lex->state != ROOT_ST)
		return (0);
	spaces = 0;
	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));	
	else if (**line == '|')
	{
		(*line)++;
		lex->next_type = PIPE;
		create_token(lex, tmp);
		return (create_token(lex, "|"));
	}
	if (!spaces || !*tmp)
		return (0);
	return (create_token(lex, tmp));
}

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

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

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(1024, sizeof *tmp);
	tmp_i = 0;
	while (*line)
	{
		if (check_state(lex, &line))
			continue;
		if (lex->state != S_QUOTE_ST && *line == '$')
			tmp_i = replace_var(datas, &line, tmp, tmp_i);
		else if (check_register(lex, &line, tmp))
			tmp_i = (ft_bzero(tmp, 1024), 0);
		else
			tmp[tmp_i++] = *(line++);
	}
	create_token(lex, tmp);
	free(tmp);
	ret = lex->tokens;
	free(lex);
	return (ret);
}