File

util/argparse.lua @ 11609:6dcc45a2e3bc

mod_s2s: Bail if connection is destroyed after attempting to open stream Fixes "attempt to compare number with nil" because `session.version` has been cleared by s2smanager.destroy_session. This can happen with the server_epoll setting opportunistic_writes enabled, which means that it can notice that the connection failed at this point, after which it triggers the whole chain of events that leads to session destruction and "cleaning" most of the session fields.
author Kim Alvefur <zash@zash.se>
date Wed, 16 Jun 2021 23:53:00 +0200 (2021-06-16)
parent 10936:d770435f0f84
child 11846:6425dfa3de45
line wrap: on
line source
local function parse(arg, config)
	local short_params = config and config.short_params or {};
	local value_params = config and config.value_params or {};

	local parsed_opts = {};

	if #arg == 0 then
		return parsed_opts;
	end
	while true do
		local raw_param = arg[1];
		if not raw_param then
			break;
		end

		local prefix = raw_param:match("^%-%-?");
		if not prefix then
			break;
		elseif prefix == "--" and raw_param == "--" then
			table.remove(arg, 1);
			break;
		end
		local param = table.remove(arg, 1):sub(#prefix+1);
		if #param == 1 and short_params then
			param = short_params[param];
		end

		if not param then
			return nil, "param-not-found", param;
		end

		local param_k, param_v;
		if value_params[param] then
			param_k, param_v = param, table.remove(arg, 1);
			if not param_v then
				return nil, "missing-value", raw_param;
			end
		else
			param_k, param_v = param:match("^([^=]+)=(.+)$");
			if not param_k then
				if param:match("^no%-") then
					param_k, param_v = param:sub(4), false;
				else
					param_k, param_v = param, true;
				end
			end
		end
		parsed_opts[param_k] = param_v;
	end
	return parsed_opts;
end

return {
	parse = parse;
}