salty-ircd/source/ircd/helpers.d

module ircd.helpers;

import std.range;

//Based on std.path.globMatch (https://github.com/dlang/phobos/blob/v2.073.2/std/path.d#L3164)
//License: Boost License 1.0 (http://www.boost.org/LICENSE_1_0.txt)
//Copyright (c) Lars T. Kyllingstad, Walter Bright
@safe pure
bool wildcardMatch(string input, string pattern)
{
	foreach (ref pi; 0 .. pattern.length)
	{
		const pc = pattern[pi];
		switch (pc)
		{
			case '*':
				if (pi + 1 == pattern.length)
				{
					return true;
				}
				for (; !input.empty; input.popFront())
				{
					auto p = input.save;
					if (wildcardMatch(p, pattern[pi + 1 .. pattern.length]))
					{
						return true;
					}
				}
				return false;
			case '?':
				if (input.empty)
				{
					return false;
				}
				input.popFront();
				break;
			default:
				if (input.empty || pc != input.front)
				{
					return false;
				}
				input.popFront();
				break;
		}
	}
	return input.empty;
}