Monday, November 08, 2010 at 12:03 AM.

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system.verbs.builtins.html.parseLinks

on parseLinks (htmltext, adrlinks) {
	<<Changes
		<<6/3/02; 7:59:19 AM by DW
			<<Created. 
			<<A very simple parser with a single goal, pull all the <links> out of an HTML document, and return a table with the extracted information. 
			<<Each sub-table of the table pointed to by adrlinks will contain the attributes of one of the <link>s. We use a trick to build this, for each link element, we convert it to XML and pass it through xml.compile. Its attributes sub-table is then copied into the returned links table. Works like a charm.
			<<We don't make sure that it's valid HTML. In other words, it will accept link elements that are in the body, not just in the head. 
			<<If there's an error, adrlinks contains the links we found before the error, we return false.
	local (s = string.lower (htmltext), ct = 1);
	new (tabletype, adrlinks);
	try {
		loop {
			local (ix = string.patternmatch ("<link", s));
			if ix == 0 {
				break};
			s = string.delete (s, 1, ix - 1);
			ix = string.patternmatch (">", s);
			local (linktext = string.mid (s, 1, ix));
			s = string.delete (s, 1, ix);
			
			local (linkstruct);
			if not (linktext endswith "/>") {
				linktext = string.replace (linktext, ">", "/>")};
			xml.compile (linktext, @linkstruct);
			local (adrsubtable = @adrlinks^.[string.padwithzeros (ct++, 3)]);
			adrsubtable^ = linkstruct [1].["/atts"]};
		return (true)}
	else {
		return (false)}}
<<bundle //test code
	<<if not defined (scratchpad.dhrbhome)
		<<scratchpad.dhrbhome = tcp.httpreadurl ("http://radio.weblogs.com/0001015/")
	<<parselinks (scratchpad.dhrbhome, @scratchpad.links)

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This listing is for code that runs in the OPML Editor environment. I created these listings because I wanted the search engines to index it, so that when I want to look up something in my codebase I don't have to use the much slower search functionality in my object database. Dave Winer.