tokeniser.c

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   tokeniser.c                                        :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: rocky <marvin@42.fr>                       +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/06/12 15:00:23 by rocky             #+#    #+#             */
/*   Updated: 2024/09/09 15:48:26 by dmdemirk         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */
 
#include "tokens.h"
#include <string.h>
 
t_token *tokenise(char *str);
char    *handle_special_chars(char *str, t_token **tokens);
t_token *new_token(char *value, t_token_type type);
void    append_token(t_token **tokens, t_token *new_token);
char    *handle_phrase(char *str, t_token **tokens);
 
t_token *tokenise(char *str)
{
    t_token *tokens;
 
    tokens = NULL;
    while (*str)
    {
        while (*str && ft_strchr(" \t\n\r\v\f", *str) != NULL)
            str++;
        if (ft_strchr("<|>", *str) != NULL)
            str = handle_special_chars(str, &tokens);
        else
            str = handle_phrase(str, &tokens);
    }
    return (tokens);
}
 
char    *handle_special_chars(char *str, t_token **tokens)
{
    if (*str == '<')
    {
        if (*(str + 1) == '<')
        {
            append_token(tokens, new_token("<<", REDIR_HEREDOC));
            (str)++;
        }
        else
            append_token(tokens, new_token("<", REDIR_IN));
    }
    else if (*str == '>')
    {
        if (*(str + 1) == '>')
        {
            append_token(tokens, new_token(">>", REDIR_APPEND));
            (str)++;
        }
        else
            append_token(tokens, new_token(">", REDIR_OUT));
    }
    else if (*str == '|')
        append_token(tokens, new_token("|", PIPE));
    (str)++;
    return (str);
}
 
t_token *new_token(char *value, t_token_type type)
{
    t_token *token;
 
    token = malloc(sizeof(t_token));
    if (!token)
        return (NULL);
    token->data = ft_strdup(value);
    if (!token->data)
    {
        free(token);
        return (NULL);
    }
    token->type = type;
    token->next = NULL;
    return (token);
}
 
void    append_token(t_token **tokens, t_token *new_token)
{
    t_token *curr;
 
    if (!*tokens)
        *tokens = new_token;
    else
    {
        curr = *tokens;
        while (curr->next)
            curr = curr->next;
        curr->next = new_token;
    }
}
 
char    *handle_phrase(char *str, t_token **tokens)
{
    char    *start;
    char    quote_flag;
    char    quote_type;
 
    start = str;
    quote_flag = 0;
    quote_type = 0;
    while (*str)
    {
        if (!quote_flag && (*str == '\'' || *str == '\"'))
        {
            quote_flag = 1;
            quote_type = *str;
        }
        else if (quote_flag && *str == quote_type)
            quote_flag = 0;
        if (!quote_flag && ft_strchr(" \t\n\r\v\f<|>", *str) != NULL)
            break ;
        str++;
    }
    append_word_if_valid(start, str, tokens);
    return (str);
}