EXT-3122: Added support for URLs without an explicit protocol.

You can now enter URLs like "www.google.com", "secondlife.com", or
"www.google.com/search?q=second%20life" and these will be hyperlinked.

indra/llui/llurlentry.cpp

@@ -196,6 +196,31 @@ std::string LLUrlEntryHTTPLabel::getUrl(const std::string &string)
 	return getUrlFromWikiLink(string);
 }
 
+//
+// LLUrlEntryHTTPNoProtocol Describes generic Urls like www.google.com
+//
+LLUrlEntryHTTPNoProtocol::LLUrlEntryHTTPNoProtocol()
+{
+	mPattern = boost::regex("(\\bwww\\.\\S+\\.\\S+|\\S+.com\\S*|\\S+.net\\S*|\\S+.edu\\S*|\\S+.org\\S*)",
+							boost::regex::perl|boost::regex::icase);
+	mMenuName = "menu_url_http.xml";
+	mTooltip = LLTrans::getString("TooltipHttpUrl");
+}
+
+std::string LLUrlEntryHTTPNoProtocol::getLabel(const std::string &url, const LLUrlLabelCallback &cb)
+{
+	return unescapeUrl(url);
+}
+
+std::string LLUrlEntryHTTPNoProtocol::getUrl(const std::string &string)
+{
+	if (string.find("://") == std::string::npos)
+	{
+		return "http://" + escapeUrl(string);
+	}
+	return escapeUrl(string);
+}
+
 //
 // LLUrlEntrySLURL Describes generic http: and https: Urls
 //

indra/llui/llurlentry.h

@@ -134,6 +134,17 @@ public:
 	/*virtual*/ std::string getUrl(const std::string &string);
 };
 
+///
+/// LLUrlEntryHTTPNoProtocol Describes generic Urls like www.google.com
+///
+class LLUrlEntryHTTPNoProtocol : public LLUrlEntryBase
+{
+public:
+	LLUrlEntryHTTPNoProtocol();
+	/*virtual*/ std::string getLabel(const std::string &url, const LLUrlLabelCallback &cb);
+	/*virtual*/ std::string getUrl(const std::string &string);
+};
+
 ///
 /// LLUrlEntrySLURL Describes http://slurl.com/... Urls
 ///

indra/llui/llurlregistry.cpp

@@ -58,6 +58,9 @@ LLUrlRegistry::LLUrlRegistry()
 	//so it should be registered in the end of list
 	registerUrl(new LLUrlEntrySL());
 	registerUrl(new LLUrlEntrySLLabel());
+	// most common pattern is a URL without any protocol,
+	// e.g., "secondlife.com"
+	registerUrl(new LLUrlEntryHTTPNoProtocol());	
 }
 
 LLUrlRegistry::~LLUrlRegistry()
@@ -118,10 +121,23 @@ static bool matchRegex(const char *text, boost::regex regex, U32 &start, U32 &en
 	return true;
 }
 
+static bool stringHasUrl(const std::string &text)
+{
+	// fast heuristic test for a URL in a string. This is used
+	// to avoid lots of costly regex calls, BUT it needs to be
+	// kept in sync with the LLUrlEntry regexes we support.
+	return (text.find("://") != std::string::npos ||
+			text.find("www.") != std::string::npos ||
+			text.find(".com") != std::string::npos ||
+			text.find(".net") != std::string::npos ||
+			text.find(".edu") != std::string::npos ||
+			text.find(".org") != std::string::npos);
+}
+
 bool LLUrlRegistry::findUrl(const std::string &text, LLUrlMatch &match, const LLUrlLabelCallback &cb)
 {
 	// avoid costly regexes if there is clearly no URL in the text
-	if (text.find("://") == std::string::npos)
+	if (! stringHasUrl(text))
 	{
 		return false;
 	}