Add most of the parser

1 files changed, 106 insertions, 0 deletions

diff --git a/src/parser.c b/src/parser.c
new file mode 100644
index 0000000..5bf82f6
--- /dev/null
+++ b/src/parser.c
@@ -0,0 +1,106 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   parser.c                                           :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/06/29 15:53:29 by dkaiser           #+#    #+#             */
+/*   Updated: 2024/07/08 16:11:07 by dkaiser          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "minishell.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);
+static t_node	*parse_cmd(t_token *tokens);
+
+t_list	*parse(t_token *tokens)
+{
+	t_list	*result;
+	t_list	*current;
+	t_token	*current_tokens;
+
+	result = NULL;
+	current_tokens = split_at_first(&tokens, NEWLINE_TOKEN);
+	while (current_tokens != NULL)
+	{
+		if (result == NULL)
+		{
+			current = ft_lstnew(parse_statement(current_tokens));
+			result = current;
+		}
+		else
+		{
+			current->next = ft_lstnew(parse_statement(current_tokens));
+			current = current->next;
+		}
+		if (current == NULL)
+		{
+			// Free: ft_lstclear(&result, free_node);
+			return (NULL);
+		}
+		current_tokens = split_at_first(&tokens, NEWLINE_TOKEN);
+	}
+	return (result);
+}
+
+static t_node	*parse_statement(t_token *tokens)
+{
+	t_token	*left_side_tokens;
+
+	left_side_tokens = split_at_first(&tokens, PIPE_TOKEN);
+	if (tokens != NULL)
+	{
+		return (new_pipe_node(parse_cmd(left_side_tokens),
+				parse_statement(tokens)));
+	}
+	else
+	{
+		return (parse_cmd(left_side_tokens));
+	}
+}
+
+static t_node	*parse_cmd(t_token *tokens)
+{
+	char			**args;
+	t_assign		**assigns;
+	t_redirection	**redirs;
+
+	redirs = collect_redirs(&tokens);
+	assigns = collect_assigns(&tokens);
+	args = collect_args(&tokens);
+	return (new_cmd_node(args, assigns, redirs));
+}
+
+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;
+	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);
+}