Avoid a few allocations for mentions.

Add six new parser test cases.
Stop treating lone double forward slashes as URLs.

Fixes #52

common/parser.go

@@ -16,6 +16,7 @@ import (
 // TODO: Somehow localise these?
 var SpaceGap = []byte("          ")
 var httpProtBytes = []byte("http://")
+var DoubleForwardSlash = []byte("//")
 var InvalidURL = []byte("<red>[Invalid URL]</red>")
 var InvalidTopic = []byte("<red>[Invalid Topic]</red>")
 var InvalidProfile = []byte("<red>[Invalid Profile]</red>")
@@ -531,7 +532,8 @@ func ParseMessage(msg string, sectionID int, sectionType string /*, user User*/)
 				sb.Write(bytesSinglequote)
 				sb.Write(urlMention)
 				sb.Write(bytesGreaterthan)
-				sb.WriteString("@" + menUser.Name)
+				sb.WriteByte('@')
+				sb.WriteString(menUser.Name)
 				sb.Write(URLClose)
 				lastItem = i
 				i--
@@ -560,11 +562,22 @@ func ParseMessage(msg string, sectionID int, sectionType string /*, user User*/)
 				urlLen, ok := PartialURLStringLen(msg[i:])
 				if len(msg) < i+urlLen {
 					//fmt.Println("o1")
-					sb.Write(InvalidURL)
+					if urlLen == 2 {
+						sb.Write(DoubleForwardSlash)
+					} else {
+						sb.Write(InvalidURL)
+					}
 					i += len(msg) - 1
 					lastItem = i
 					break
 				}
+				if urlLen == 2 {
+					sb.Write(DoubleForwardSlash)
+					i += urlLen
+					lastItem = i
+					i--
+					continue
+				}
 				//fmt.Println("msg[i:i+urlLen]:", "'"+msg[i:i+urlLen]+"'")
 				if !ok {
 					//fmt.Printf("o2: i = %d; i+urlLen = %d\n",i,i+urlLen)

parser_test.go

@@ -145,22 +145,23 @@ func TestParser(t *testing.T) {
 	msgList.Add("", "")
 	msgList.Add("haha", "haha")
 	msgList.Add("<b>t</b>", "<b>t</b>")
-	msgList.Add("//", "<red>[Invalid URL]</red>")
+	msgList.Add("//", "//")
 	msgList.Add("http://", "<red>[Invalid URL]</red>")
 	msgList.Add("https://", "<red>[Invalid URL]</red>")
 	msgList.Add("ftp://", "<red>[Invalid URL]</red>")
 	msgList.Add("git://", "<red>[Invalid URL]</red>")
 	msgList.Add("ssh://", "ssh://")
 
-	msgList.Add("// ", "<red>[Invalid URL]</red> ")
+	msgList.Add("// ", "// ")
-	msgList.Add("// //", "<red>[Invalid URL]</red> <red>[Invalid URL]</red>")
+	msgList.Add("// //", "// //")
+	msgList.Add("// // //", "// // //")
 	msgList.Add("http:// ", "<red>[Invalid URL]</red> ")
 	msgList.Add("https:// ", "<red>[Invalid URL]</red> ")
 	msgList.Add("ftp:// ", "<red>[Invalid URL]</red> ")
 	msgList.Add("git:// ", "<red>[Invalid URL]</red> ")
 	msgList.Add("ssh:// ", "ssh:// ")
 
-	msgList.Add("// t", "<red>[Invalid URL]</red> t")
+	msgList.Add("// t", "// t")
 	msgList.Add("http:// t", "<red>[Invalid URL]</red> t")
 
 	msgList.Add("http:", "http:")
@@ -183,6 +184,11 @@ func TestParser(t *testing.T) {
 	msgList.Add("haha\nhaha\nhaha", "haha<br>haha<br>haha")
 	msgList.Add("//"+url, "<a href='//"+url+"'>//"+url+"</a>")
 	msgList.Add("//a", "<a href='//a'>//a</a>")
+	msgList.Add(" //a", " <a href='//a'>//a</a>")
+	msgList.Add("//a ", "<a href='//a'>//a</a> ")
+	msgList.Add(" //a ", " <a href='//a'>//a</a> ")
+	msgList.Add("d //a ", "d <a href='//a'>//a</a> ")
+	msgList.Add("ddd ddd //a ", "ddd ddd <a href='//a'>//a</a> ")
 	msgList.Add("https://"+url, "<a href='https://"+url+"'>https://"+url+"</a>")
 	msgList.Add("https://t", "<a href='https://t'>https://t</a>")
 	msgList.Add("http://"+url, "<a href='http://"+url+"'>http://"+url+"</a>")