RSS Reader - Printable Version

Code:
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