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