matchers: add matcher for <blank> character class

Makefile

@@ -25,6 +25,7 @@ srcs = \
 	src/env/envp.c \
 	src/ft_errno.c \
 	src/get_command.c \
+	src/parser/matchers/blank.c \
 	src/parser/matchers/identifier.c \
 	src/parser/matchers/metacharacter.c \
 	src/parser/worddesc/worddesc.c \

src/parser/matchers/blank.c

@@ -0,0 +1,26 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   blank.c                                            :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: khais <marvin@42.fr>                       +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/02/14 15:07:27 by khais             #+#    #+#             */
+/*   Updated: 2025/02/14 15:26:28 by khais            ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include <stdbool.h>
+#include "libft.h"
+
+/*
+** https://pubs.opengroup.org/onlinepubs/9699919799/
+** section 7.3.1 LC_CTYPE, blank character class
+*/
+bool	is_blank(char c)
+{
+	if (ft_strchr(" \t", c) != NULL)
+		return (true);
+	else
+		return (false);
+}

src/parser/matchers/blank.h

@@ -0,0 +1,20 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   blank.h                                            :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: khais <marvin@42.fr>                       +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/02/14 15:08:36 by khais             #+#    #+#             */
+/*   Updated: 2025/02/14 15:09:02 by khais            ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#ifndef BLANK_H
+# define BLANK_H
+
+# include <stdbool.h>
+
+bool	is_blank(char c);
+
+#endif