Merge branch 'env' of https://github.com/dpu-kaiser/minishell into env

1 files changed, 84 insertions, 0 deletions

diff --git a/src/parser.c b/src/parser.c
new file mode 100644
index 0000000..06c1df7
--- /dev/null
+++ b/src/parser.c
@@ -0,0 +1,84 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   parser.c                                           :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/06/29 15:53:29 by dkaiser           #+#    #+#             */
+/*   Updated: 2024/09/17 19:03:48 by dkaiser          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft.h"
+#include "minishell.h"
+#include "token.h"
+
+static t_token	*find_token_by_type(t_token *tokens, int type);
+t_token			*split_at_first(t_token **tokens, int type);
+static t_node	*parse_statement(t_token *tokens);
+
+t_list	*parse(t_token *tokens)
+{
+	t_node	*result;
+
+	if ((*tokens).type == PIPE_TOKEN)
+		result = NULL;
+	else
+		result = parse_statement(tokens);
+	if (result == NULL)
+		printf("Parsing error.\n");
+	return (ft_lstnew(result));
+}
+
+static t_node	*parse_statement(t_token *tokens)
+{
+	t_token	*left_side_tokens;
+
+	left_side_tokens = split_at_first(&tokens, PIPE_TOKEN);
+	if (left_side_tokens == NULL)
+	{
+		free_tokens(tokens);
+		return (NULL);
+	}
+	else if (tokens != NULL)
+	{
+		return (new_pipe_node(parse_cmd(left_side_tokens),
+				parse_statement(tokens)));
+	}
+	else
+	{
+		return (parse_cmd(left_side_tokens));
+	}
+}
+
+t_token	*split_at_first(t_token **tokens, int type)
+{
+	t_token	*split;
+	t_token	*result;
+
+	split = find_token_by_type(*tokens, type);
+	if (split == NULL)
+	{
+		result = *tokens;
+		*tokens = NULL;
+		return (result);
+	}
+	result = *tokens;
+	*tokens = split->next;
+	if (result == split)
+		result = NULL;
+	free_token(split);
+	return (result);
+}
+
+static t_token	*find_token_by_type(t_token *tokens, int type)
+{
+	while (tokens != NULL)
+	{
+		if (tokens->type == type)
+			return (tokens);
+		tokens = tokens->next;
+	}
+	return (NULL);
+}