suspend fun parse()

in core/src/main/java/com/github/shadowsocks/acl/Acl.kt [70:109]
40 lines of code
10 McCabe index (conditional complexity)

        suspend fun <T> parse(reader: Reader, bypassHostnames: (String) -> T, proxyHostnames: (String) -> T,
                              urls: ((URL) -> T)? = null, defaultBypass: Boolean = false): Pair<Boolean, List<Subnet>> {
            var bypass = defaultBypass
            val bypassSubnets = mutableListOf<Subnet>()
            val proxySubnets = mutableListOf<Subnet>()
            var hostnames: ((String) -> T)? = if (defaultBypass) proxyHostnames else bypassHostnames
            var subnets: MutableList<Subnet>? = if (defaultBypass) proxySubnets else bypassSubnets
            reader.useLines {
                for (line in it) {
                    coroutineContext[Job]!!.ensureActive()
                    val input = (if (urls == null) line else {
                        val blocks = line.split('#', limit = 2)
                        val url = networkAclParser.matchEntire(blocks.getOrElse(1) { "" })?.groupValues?.getOrNull(1)
                        if (url != null) urls(URL(url))
                        blocks[0]
                    }).trim()
                    if (input.getOrNull(0) == '[') when (input) {
                        "[outbound_block_list]" -> {
                            hostnames = null
                            subnets = null
                        }
                        "[black_list]", "[bypass_list]" -> {
                            hostnames = bypassHostnames
                            subnets = bypassSubnets
                        }
                        "[white_list]", "[proxy_list]" -> {
                            hostnames = proxyHostnames
                            subnets = proxySubnets
                        }
                        "[reject_all]", "[bypass_all]" -> bypass = true
                        "[accept_all]", "[proxy_all]" -> bypass = false
                        else -> error("Unrecognized block: $input")
                    } else if (subnets != null && input.isNotEmpty()) {
                        val subnet = Subnet.fromString(input)
                        if (subnet == null) hostnames!!(input) else subnets!!.add(subnet)
                    }
                }
            }
            return bypass to if (bypass) proxySubnets else bypassSubnets
        }