parser_grammar.c

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   parser_grammar.c                                   :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: baelgadi <baelgadi@student.42.fr>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2025/12/10 18:11:17 by zotaj-di          #+#    #+#             */
/*   Updated: 2026/03/04 07:14:20 by baelgadi         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */
 
#include "parser.h"
 
static int  validate_empty(t_token *tokens)
{
    if (!tokens)
        return (print_syntax_error(ERR_EMPTY_INPUT));
    return (0);
}
 
static int  validate_pipe_position(t_token *tokens)
{
    t_token *current;
 
    if (!tokens)
        return (0);
    if (tokens->type == TOKEN_PIPE)
        return (print_syntax_error(ERR_PIPE_START));
    current = tokens;
    while (current)
    {
        if (current->type == TOKEN_PIPE)
        {
            if (!current->next)
                return (print_syntax_error(ERR_PIPE_END));
            if (current->next->type == TOKEN_PIPE)
                return (print_syntax_error(ERR_PIPE_DOUBLE));
        }
        current = current->next;
    }
    return (0);
}
 
static int  validate_redir_syntax(t_token *tokens)
{
    t_token *current;
 
    current = tokens;
    while (current)
    {
        if (is_redirection(current->type))
        {
            if (!current->next)
                return (print_syntax_error(ERR_REDIR_NO_FILE));
            if (current->next->type != TOKEN_WORD)
                return (print_syntax_error(ERR_REDIR_NO_FILE));
        }
        current = current->next;
    }
    return (0);
}
 
int validate_syntax(t_token *tokens)
{
    if (validate_empty(tokens) < 0)
        return (-1);
    if (validate_pipe_position(tokens) < 0)
        return (-1);
    if (validate_redir_syntax(tokens) < 0)
        return (-1);
    return (0);
}