Click Notes II - Click Script Language_click click notes-优快云博客

本文链接：https://blog.youkuaiyun.com/bonny95/article/details/42541891

Click编程语言主要用于配置Click路由器，同时也可用于编写Click元件的测试案例。该语言定义了一种配置图，由相互连接的元件组成。每个元件都有一个指定的元件类别，并通过输入和输出端口进行连接。

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The Click programming language was developed to configure Click routers, but nowadays you also can use it to write test cases for Click elements.

Basic Syntax

The Click Script Language defines a configuration graph, which consists of connected elements. Each element has an element class specified by class name. Elements are connected through their input and output ports. Input and output ports are distinguished by number, while elements are distinguished by name.

Click configuration strings are comma-separated lists of arguments delimited by parentheses. The fundamental syntax of Click Script Language is:

 name :: class(config-string);    // declare element object
name1, name2, ..., nameN :: class(config); // declaration shorhand
name1[port1] -> [port2]name2;    // connect two elements
name1[port1] -> [port2a]name2[port2b] -> [port3]name3;    // piggyback connections
name1 -> name2 :: class(config-string) -> name3;  // declaring elements inside connections is allowed
name1 -> class(config-string) -> name3;  // anonymous element
require(requirement[, requirement …]);   // list config requirements
n1, n2 :: class -> n3;  // many-to-one connections
// many-to-many connections:
// A many-to-many connection matches output ports to input ports. 
// There must be as many ports on the left as on the right.
// '=>' is the many-to-many connector.
c[0], c[1], c[2] => Paint(0), Paint(1), Paint(2) -> next;
c => Paint(0), Paint(1), Paint(2) -> next;