Moved multi-byte whitespace handling code

The filtering process now checks whether or not the character is unicode
before checking it against the whitespace list.  (It makes no sense to
check that ASCII characters match three-byte characters.)

Also moved the newline checking into the one-byte tests.

scripting/csrd_name_filter.sp

@@ -15,7 +15,7 @@
 
 #pragma newdecls required
 
-#define PLUGIN_VERSION "1.0.1"
+#define PLUGIN_VERSION "1.0.2"
 public Plugin myinfo = {
 	name = "[CSRD] Name Filter",
 	author = "nosoop",
@@ -27,10 +27,23 @@ public Plugin myinfo = {
 
 #define UNPRINTABLE_NAME_USER_FORMAT "unprintable (%d)"
 
-int g_FilteredWhitespace[] = {
+int g_FilteredMultiByteWhitespace[] = {
 	0xe2a080, // braille pattern blank U+2800
-	0x0a, // linefeed
-	0x0d, // carriage return
+	0xe2819f, // medium mathematical space U+205F
+	
+	/* invisible math operators, &c. (char & 0xe281a0) */
+	0xe281a0, // word joiner U+2060
+	0xe281a1, // function application U+2061
+	0xe281a2, // invisible times U+2062
+	0xe281a3, // invisible separator U+2063
+	0xe281a4, // invisible plus U+2064
+	
+	0xe281aa, // inhibit symmetric swapping U+206A
+	0xe281ab, // activate symmetric swapping U+206B
+	0xe281ac, // inhibit arabic form shaping U+206C
+	0xe281ad, // activate arabic form shaping U+206D
+	0xe281ae, // national digit shapes U+206E
+	0xe281af, // nominal digit shapes U+206F
 	0
 };
 
@@ -68,10 +81,19 @@ void OnNameUpdated(int client) {
 		bool bCharFiltered;
 		
 		// Filter out non-printing characters that can't be handled elsewhere.
-		int c;
-		do {
-			bCharFiltered |= (fullChar == g_FilteredWhitespace[c]);
-		} while (g_FilteredWhitespace[++c] != 0 && !bCharFiltered);
+		switch (nCharBytes) {
+			case 3: {
+				// filter unicode invisible characters
+				bCharFiltered |= IsUnicodeCharInvisible(fullChar);
+			}
+			case 1: {
+				// filter out newlines
+				bCharFiltered |= (fullChar == 0x0d || fullChar == 0x0a);
+			}
+			default: {
+				// unhandled
+			}
+		}
 		
 		if (!bCharFiltered) {
 			// it's a character we're not filtering
@@ -105,6 +127,17 @@ void OnNameUpdated(int client) {
 	// TODO else not name changed, but check if we can do other non-filter stuff? (trim)
 }
 
+bool IsUnicodeCharInvisible(int uchar) {
+	int c;
+	do {
+		if (uchar == g_FilteredMultiByteWhitespace[c]) {
+			return true;
+		}
+	} while (g_FilteredMultiByteWhitespace[++c] != 0);
+	
+	return false;
+}
+
 /**
  * Attempts to lock the specified client's name with the existing `namelockid` command.
  */