expand + bug fixes

srcs/expander/expand_var.c

@@ -0,0 +1,121 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   expand_var.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: lderidde <lderidde@student.s19.be>        +#+  +:+       +#+         */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/02/07 12:58:25 by lderidde          #+#    #+#             */
+/*   Updated: 2025/02/08 10:53:48 by lderidde         ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "../../includes/minishell.h"
+
+static int is_validchar(char c)
+{
+	if (ft_isalnum(c) || c == '_')
+		return (1);
+	return (0);
+}
+
+static int	get_var_len(t_ast_n *node, int j , int *i)
+{
+	int len;
+	int	ret;
+	char *str;
+
+	len = *i + 1;
+	while (node->args[j][len] && is_validchar(node->args[j][len]))
+		len++;
+	str = ft_substr(node->args[j], *i + 1, (size_t)len - (*i + 1));
+	*i = len;
+	ret = ft_strlen(get_var_value(str, node->msh->env));
+	ft_free(&str);
+	return (ret - (len  - (*i + 1)));
+}
+
+static char	*extract_env(char *str, char **envp)
+{
+	int		i;
+	char	*var;
+	char	*tmp;
+
+	i = 1;
+	while (str[i] && is_validchar(str[i]))
+		i++;
+	if (i > 1)
+		tmp = ft_substr(str, 1, i - 1);
+	var = get_var_value(tmp, envp);
+	free(tmp);
+	return (var);
+}
+
+static int	get_new_len(t_ast_n *node, int j)
+{
+	int	i;
+	int	len;
+
+	i = 0;
+	len = ft_strlen(node->args[j]);
+	while (node->args[j][i])
+	{
+		if (node->args[j][i] == '$')
+		{
+			len += get_var_len(node, j , &i);
+			i--;
+		}
+		i++;
+	}
+	return (len);
+}
+
+int	valid_next(char c)
+{
+	if (c != '\0' && is_validchar(c))
+		return (1);
+	return (0);
+}
+
+void	expander_var(t_ast_n *node, int j)
+{
+	int	i;
+	int k;
+	int	len;
+	char	*new;
+
+	i = -1;
+	len = get_new_len(node, j);
+	new = ft_calloc(len + 1, sizeof(char));
+	if (!new)
+		return ;
+	k = 0;
+	while (node->args[j][k] && ++i < len)
+	{
+		if (node->args[j][k] != '$')
+			new[i] = node->args[j][k++];
+		else if (node->args[j][k] == '$' && valid_next(node->args[j][k + 1]))
+		{
+			ft_strlcat(new, extract_env(&node->args[j][k], node->msh->env), -1);
+			i = ft_strlen(new) - 1;
+			while (node->args[j][++k] && is_validchar(node->args[j][k]))
+				continue ;
+		}
+	}
+	ft_free(&node->args[j]);
+	node->args[j] = new;
+}
+
+int	expand_var(t_ast_n *node, int j)
+{
+	int	i;
+
+	i = 0;
+	while (node->args[j][i])
+	{
+		if (node->args[j][i] == '$')
+			return (expander_var(node, j), 1);
+		i++;
+	}
+	return (0);
+}