【Rust项目推荐】造了一个可以用来写爬虫的轮子nipper

use nipper::Document;

let html = include_str!("../test-pages/hacker_news.html");
let document = Document::from(html);

document.select("tr.athing").iter().for_each(|athing| {
    let title = athing.select(".title a");
    let source = title.select(".sitestr");
    // The next sibling.
    let meta = athing.next();
    let score = meta.select("span.score");
    let hnuser = meta.select("a.hnuser");
    let age = meta.select("span.age");
    // The last matched element.
    let comment = meta.select("a").last();

    println!("Title: {}", title.text());
    if source.exists() {
        println!("> from: {}", source.text());
    }
    if score.exists() {
        println!("> {}", score.text());
    }
    if hnuser.exists() {
        println!("> by {}", hnuser.text());
    }
    println!("> {}", age.text());
    println!("> {}", comment.text());
    println!();
});
其实rust早就有了类似的crate，但是这些轮子语法都有点繁琐，而且基本都只能查询，不能修改元素，
所以就在清明搞了这么一个东西，借鉴了golang里的goquery，语法就是css 选择器的语法。