// LocaPoint linkify
// Author: Nao Ueda
//         Locazing Inc. http://www.locapoint.com
// Version: 1.0 - 16Apr2006 - Initial Release
// License: GNU GPL v2 or later
//
//
// This Code bollows, copyes, and imitates from following User scripts. I really thank these authors.
// UPS Tracking Linkify (http://plutor.org/files/upslinkify.user.js) by Logan Ingalls,
// VoIP Dial Linkify (http://www.muehlen.com/projects/voip/voip_dial.user.js) by Ralf Muehlen,
// and mostly
// Postcode linkify (http://www.qwghlm.co.uk/projects/postcodelinkify.user.js) by Chris Applegate.
// 
// Usage:
// Search for a location information ponited by LocaPoint(TM), 
// Turn into hyperlink to the relevant location on Google Maps, 
// and Add a Title with Latitude/Longitude information
//
//
// ==UserScript==
// @name           LocaPoint Linkify
// @namespace      http://www.locapoint.com/
// @description    Hyperlinkifies any LocaPoint into into a link to the Google Map for that location
// @include        *
// ==/UserScript==

(function () {
	
	// URL of the map lookup
	mapURL = "http://maps.google.com/?q=";
	
	// Locapoint Pattern:"AA0.AA0.AA0.AA0"
	const lpRegex = /([A-Z]{2}\d\.){3}[A-Z]{2}\d/g;
	
	//tags we will scan looking for un-hyperlinked urls
	var allowedParents = [
	       "abbr", "acronym", "address", "applet", "b", "bdo", "big", "blockquote", "body", 
	       "caption", "center", "cite", "code", "dd", "del", "div", "dfn", "dt", "em", 
	       "fieldset", "font", "form", "h1", "h2", "h3", "h4", "h5", "h6", "i", "iframe",
	       "ins", "kdb", "li", "object", "pre", "p", "q", "samp", "small", "span", "strike", 
	      "s", "strong", "sub", "sup", "td", "th", "tt", "u", "var"];
	    
	// Xpath statement
	var xpath = "//text()[(parent::" + allowedParents.join(" or parent::") + ")]";
	
	// Pick out all text nodes in page that have an allowed parent
	var candidates = document.evaluate(xpath, document, null, XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE, null);
	
	// For each candidate...
	for (var cand = null, i = 0; (cand = candidates.snapshotItem(i)); i++) {
	
		// See if it contains our regexp, if it does...
		if (lpRegex.test(cand.nodeValue)) {
			
 			// Create a new initially blank node to put in text's place
			var span = document.createElement("span");
			var source = cand.nodeValue;
			cand.parentNode.replaceChild(span, cand);
			
			// Go through each instance
			lpRegex.lastIndex = 0;
			for (var match = null, lastLastIndex = 0; (match = lpRegex.exec(source)); ) {
				// Convert LocaPoint into Latitude and Longitude
				var location = Locapoint2LatLon(match[0]);
				
				// Then create a hyperlink
				var a = document.createElement("a");
				a.setAttribute("href", mapURL + location.latitude + "," + location.longitude);
				a.setAttribute("title", "lat,lon= " + location.latitude + "," + location.longitude);
				// Set linktext to be LocaPoint
				a.appendChild(document.createTextNode(match[0]));
				
				// Add text between end of previous instance and start of this one
				span.appendChild(document.createTextNode(source.substring(lastLastIndex, match.index)));
				
				// Add the hyperlink in
				span.appendChild(a);
				// Remember the end index of this instance
				lastLastIndex = lpRegex.lastIndex;
			}
			
			// Add the rest of the text in
			span.appendChild(document.createTextNode(source.substring(lastLastIndex)));
			span.normalize(); 
			
			// All done!
		} 
	}
	function Locapoint2LatLon(locapoint){
		var location = new Object();
		
		location.latitude =(
			((locapoint.charCodeAt(0)-65)*1757600
			+(locapoint.charCodeAt(1)-65)*67600
			+(locapoint.charCodeAt(2)-48)*6760
			+(locapoint.charCodeAt(8)-65)*260
			+(locapoint.charCodeAt(9)-65)*10
			+(locapoint.charCodeAt(10)-48))
			*180/45697600-90).toFixed(6);
		location.longitude = (
			((locapoint.charCodeAt(4)-65)*1757600
			+(locapoint.charCodeAt(5)-65)*67600
			+(locapoint.charCodeAt(6)-48)*6760
			+(locapoint.charCodeAt(12)-65)*260
			+(locapoint.charCodeAt(13)-65)*10
			+(locapoint.charCodeAt(14)-48) )
			*360/45697600-180).toFixed(6);
		return(location);
	}

})();