expander.c

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   expander.c                                         :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: baelgadi <baelgadi@student.42.fr>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2025/12/06 16:47:17 by zotaj-di          #+#    #+#             */
/*   Updated: 2026/03/04 04:43:45 by baelgadi         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */
 
#include "token.h"
#include "env.h"
#include "libft.h"
 
static int  handle_special_var(char *str, char **result, int exit_status)
{
    char    *value;
 
    if (str[1] == '?')
    {
        value = ft_itoa(exit_status);
        *result = append_str(*result, value);
        free(value);
        return (2);
    }
    return (0);
}
 
static int  process_dollar(char *str, int i, char **result, t_env *env_list)
{
    char    *var_name;
    char    *var_value;
    int     len;
 
    var_name = extract_var_name(str + i + 1, &len);
    if (!var_name)
        return (1);
    if (len == 0)
    {
        *result = append_char(*result, '$');
        free(var_name);
        return (1);
    }
    if (ft_isdigit(var_name[0]) && var_name[0] == '0')
    {
        free(var_name);
        *result = append_str(*result, "minidevil");
        return (2);
    }
    var_value = get_env_value(env_list, var_name);
    if (var_value)
        *result = append_str(*result, var_value);
    free(var_name);
    return (len + 1);
}
 
static int  handle_dollar_sign(char *str, char **result, t_env *env_list,
        int exit_status)
{
    int skip;
 
    skip = handle_special_var(str, result, exit_status);
    if (skip > 0)
        return (skip);
    if (is_var_char(str[1]))
        return (process_dollar(str, 0, result, env_list));
    *result = append_char(*result, '$');
    return (1);
}
 
char    *expand_variables(char *str, t_env *env_list, t_quote_type quote_type,
        int exit_status)
{
    char    *result;
    int     i;
 
    if (quote_type == QUOTE_SINGLE)
        return (ft_strdup(str));
    result = ft_strdup("");
    if (!result)
        return (NULL);
    i = 0;
    while (str[i])
    {
        if (str[i] == '$' && str[i + 1])
            i += handle_dollar_sign(str + i, &result, env_list, exit_status);
        else
        {
            result = append_char(result, str[i]);
            i++;
        }
        if (!result)
            return (NULL);
    }
    return (result);
}
 
int expand_all_tokens(t_token *tokens, t_shell *shell)
{
    char    *expanded;
    t_token *prev;
 
    prev = NULL;
    while (tokens)
    {
        if (tokens->type == TOKEN_WORD)
        {
            if (tokens->quote_type == QUOTE_SINGLE || (prev
                    && prev->type == TOKEN_HEREDOC))
                expanded = ft_strdup(tokens->value);
            else if (is_dollar_quote(tokens))
                expanded = ft_strdup("");
            else
                expanded = expand_full(tokens->value, shell->env,
                        tokens->quote_type, shell->exit_status);
            if (!expanded)
                return (-1);
            free(tokens->value);
            tokens->value = expanded;
        }
        prev = tokens;
        tokens = tokens->next;
    }
    return (0);
}