如何使用Nokogiri和Ruby解析JavaScript [英] How to parse JavaScript using Nokogiri and Ruby

问题描述

我需要从网站中解析出一个数组.我要解析的JavaScript部分如下所示:

I need to parse an array out of a website. The part of the JavaScript I want to parse looks like this:

_arPic[0] = "http://example.org/image1.jpg";
_arPic[1] = "http://example.org/image2.jpg";
_arPic[2] = "http://example.org/image3.jpg";
_arPic[3] = "http://example.org/image4.jpg";
_arPic[4] = "http://example.org/image5.jpg";
_arPic[5] = "http://example.org/image6.jpg";

我使用如下代码获取整个JavaScript:

I get the whole JavaScript using something like this:

product_page = Nokogiri::HTML(open(full_url))    
product_page.css("div#main_column script")[0]

是否有一种简单的方法来解析所有变量?

Is there an easy way to parse all the variables?

推荐答案

如果我没看错，您正在尝试解析JavaScript并使用您的图片网址获取Ruby数组，是吗?

If I read you correctly you're trying to parse the JavaScript and get a Ruby array with your image URLs yes?

Nokogiri仅解析HTML/XML，因此您将需要一个不同的库；粗略的搜索会显示 RKelly 库，该库具有 parse 函数，该函数需要JavaScript字符串并返回解析树.

Nokogiri only parses HTML/XML so you're going to need a different library; A cursory search turns up the RKelly library which has a parse function that takes a JavaScript string and returns a parse tree.

一旦有了一个解析树，您将需要遍历它并按名称找到感兴趣的节点(例如 _arPic )，然后在分配的另一端获取字符串内容.

Once you have a parse tree you're going to need to traverse it and find the nodes of interest by name (e.g. _arPic) then get the string content on the other side of the assignment.

或者，如果不必太健壮(也不一定)，则可以使用正则表达式来搜索JavaScript:

Alternatively, if it doesn't have to be too robust (and it wouldn't be) you can just use a regex to search the JavaScript if possible:

/^\s*_arPic\[\d\] = "(.+)";$/

可能是一个很好的入门正则表达式.

might be a good starter regex.

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