RSS Reader

[Pawel]

I want to show on visualization some rss feed. Is there some example of this functionality? Or maybe some library which help to work with xml files?

[admin]

You can use LuaSocket to fetch the RSS feed and the parse it using LuaExpat:
http://w3.impa.br/~diego/software/luasoc...ml#request
https://matthewwild.co.uk/projects/luaex...mples.html

[Pawel]

Thanks, i didnt know which module, to handle with xml, you add.

[Pawel]

Can you give me some working example of luaexpat? this, on the web you gave, is very strange and non documented, so understanding is very difficult.

[admin]

Here's an example that will get text from <title> and <description> tags inside of each <item> tag and save them in a table.

Code:

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itemtag = false result = {} -- callback for tag start function starttag(parser, tag)  -- create new storage in result table for each <item> tag  if tag == 'item' then    itemtag = true    table.insert(result, {})  end  currtag = tag end -- callback for tag end function endtag(p, tag)  if tag == 'item' then    itemtag = false  end  currtag = nil end -- callback for character data function cdata(parser, text)  -- check if parser is inside of <item> and either in <title> or <description>  if itemtag and currtag then    if currtag == 'title' then      result[ #result ].title = text    elseif currtag == 'description' then      result[ #result ].description = text    end  end end -- create parser lxp = require('lxp') parser = lxp.new({  StartElement = starttag,  EndElement = endtag,  CharacterData = cdata, }) -- sample data data = [[ <?xml version="1.0" encoding="UTF-8" ?> <rss version="2.0"> <channel> <title>RSS Title</title> <description>This is an example of an RSS feed</description> <link>http://www.example.com/main.html</link> <lastBuildDate>Mon, 06 Sep 2010 00:01:00 +0000 </lastBuildDate> <pubDate>Sun, 06 Sep 2009 16:20:00 +0000</pubDate> <ttl>1800</ttl> <item>  <title>Example entry</title>  <description>Here is some text containing an interesting description.</description>  <link>http://www.example.com/blog/post/1</link>  <guid isPermaLink="true">7bd204c6-1655-4c27-aeee-53f933c5395f</guid>  <pubDate>Sun, 06 Sep 2009 16:20:00 +0000</pubDate> </item> <item>  <title>Another example entry</title>  <description>Here is some other text containing an interesting description.</description>  <link>http://www.example.com/blog/post/1</link>  <guid isPermaLink="true">7bd204c6-1655-4c27-aeee-53f933c5395f</guid>  <pubDate>Sun, 06 Sep 2009 16:20:00 +0000</pubDate> </item> </channel> </rss> ]] if parser:parse(data) then  log(result) else  log('parse failed') end

[Pawel]

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