我怎样才能用C语言编写jQuery？

Question

How to do jQuery like calls in C language?

Say we have a packets (html for example):

<div id="mymute"> 
 <div>
 </div>
 <div>
   <img src="/agents/sleeping.png" />
 </div>
 <div>
 </div>
</div>

Javascript/Jquery it query that packets and find the image tag and update the src attribute. using simply like this:

$('#mymute').find('div').find('img').attr('src','/agents/wakeUP.png'); 

But in C how can i do something like this? (not how to parse a string but how to implement such function().function().function().function().endless...().endless()?

main.c:

int
main () {
"This is a html string".cWayFind("is").cWayFind("etc etc").cWayModify(properties, tonewProperties);

 return 0;
}

Answer 1

You probably want to use C++. There, it's very easy to return an object from a function which can reference the same underlying data. Ie if you have something like

 struct DOMNode {
      DOMNode Find (const char* name);
 };

you can immediately type DOMNode ().Find("foo").Find("bar"); , no special magic required.

If you want to modify the object itself, just return a reference to this .

 struct DOMNode {
      DOMNode& SetAttribute (const char* name, const char* value) { /* ... */; return *this; }
 };

Answer 2

Here's a great place to start:

http://en.wikipedia.org/wiki/Method_chaining

Answer 3

You need a jQuery type parser implemented in C++. At this point I do not know of any that exists.

Answer 4

To do something like this usually you pass the receiver, ie this , as the first argument to each function call.

cWayModify(cWayFind(cWayFind("This is a html string", "is"), "etc etc"), properties, tonewProperties);

The most inner function call is evaluated first. The dot operator for method call is really just syntactic sugar to make the code more readable; The first action that is evaluated occurs first in a chained line of code.