Adds preference to control multilingual behaviour (#7064)

* Adds preference to control multilingual behaviour
Examine mode preference should persist across reconnections to a single round
Still looking into how to properly get these to go into the savefile

* typos

code/modules/client/client defines.dm

@@ -28,8 +28,6 @@
 	var/chatOutputLoadedAt
 
 	var/adminhelped = 0
-	var/examine_text_mode = 0 // Just examine text, include usage (description_info), switch to examine panel.
-
 
 		///////////////
 		//SOUND STUFF//

code/modules/client/preferences.dm

@@ -131,6 +131,10 @@ datum/preferences
 
 	var/lastnews // Hash of last seen lobby news content.
 
+	var/examine_text_mode = 0 // Just examine text, include usage (description_info), switch to examine panel.
+	var/multilingual_mode = 0 // Default behaviour, delimiter-key-space, delimiter-key-delimiter, off
+
+
 /datum/preferences/New(client/C)
 	player_setup = new(src)
 	set_biological_gender(pick(MALE, FEMALE))

code/modules/client/preferences_toggle_procs.dm

@@ -313,17 +313,34 @@
 	set category = "Preferences"
 	set desc = "Control the additional behaviour of examining things"
 
-	examine_text_mode++
-	examine_text_mode %= EXAMINE_MODE_MAX // This cycles through them because if you're already specifically being routed to the examine panel, you probably don't need to have the extra text printed to chat
-	switch(examine_text_mode)				// ... And I only wanted to add one verb
+	prefs.examine_text_mode++
+	prefs.examine_text_mode %= EXAMINE_MODE_MAX // This cycles through them because if you're already specifically being routed to the examine panel, you probably don't need to have the extra text printed to chat
+	switch(prefs.examine_text_mode)				// ... And I only wanted to add one verb
 		if(EXAMINE_MODE_DEFAULT)
-			to_chat(src, "Examining things will only output the base examine text, and you will not be redirected to the examine panel automatically.")
+			to_chat(src, "<span class='filter_system'>Examining things will only output the base examine text, and you will not be redirected to the examine panel automatically.</span>")
 
 		if(EXAMINE_MODE_INCLUDE_USAGE)
-			to_chat(src, "Examining things will also print any extra usage information normally included in the examine panel to the chat.")
+			to_chat(src, "<span class='filter_system'>Examining things will also print any extra usage information normally included in the examine panel to the chat.</span>")
 
 		if(EXAMINE_MODE_SWITCH_TO_PANEL)
-			to_chat(src, "Examining things will direct you to the examine panel, where you can view extended information about the thing.")
+			to_chat(src, "<span class='filter_system'>Examining things will direct you to the examine panel, where you can view extended information about the thing.</span>")
+
+/client/verb/toggle_multilingual_mode()
+	set name = "Toggle Multilingual Mode"
+	set category = "Preferences"
+	set desc = "Control the behaviour of multilingual speech parsing"
+
+	prefs.multilingual_mode++
+	prefs.multilingual_mode %= MULTILINGUAL_MODE_MAX // Cycles through the various options
+	switch(prefs.multilingual_mode)
+		if(MULTILINGUAL_DEFAULT)
+			to_chat(src, "<span class='filter_system'>Multilingual parsing will only check for the delimiter-key combination (,0galcom-2tradeband).</span>")
+		if(MULTILINGUAL_SPACE)
+			to_chat(src, "<span class='filter_system'>Multilingual parsing will enforce a space after the delimiter-key combination (,0 galcom -2still galcom). The extra space will be consumed by the pattern-matching.</span>")
+		if(MULTILINGUAL_DOUBLE_DELIMITER)
+			to_chat(src, "<span class='filter_system'>Multilingual parsing will enforce the a language delimiter after the delimiter-key combination (,0,galcom -2 still galcom). The extra delimiter will be consumed by the pattern-matching.</span>")
+		if(MULTILINGUAL_OFF)
+			to_chat(src, "<span class='filter_system'>Multilingual parsing is now disabled. Entire messages will be in the language specified at the start of the message.</span>")
 
 
 //Toggles for Staff

code/modules/mob/say.dm

@@ -148,8 +148,8 @@
 /mob/proc/find_valid_prefixes(message)
 	var/list/prefixes = list() // [["Common", start, end], ["Gutter", start, end]]
 	for(var/i in 1 to length(message))
-		// This grabs trimmed 3 character substrings, to allow for up to 1 prefix and 1 letter language keys
-		var/selection = trim_right(lowertext(copytext(message, i, i + 2)))
+		// This grabs 3 character substrings, to allow for up to 1 prefix, 1 letter language key, and one post-key character to more strictly control where the language breaks happen
+		var/selection = lowertext(copytext(message, i, i + 3))
 		// The first character in the selection will always be the prefix (if this is a valid language invocation)
 		var/prefix = copytext(selection, 1, 2)
 		var/language_key = copytext(selection, 2, 3)
@@ -157,6 +157,18 @@
 			// Okay, we're definitely now trying to invoke a language (probably)
 			// This "[]" is probably unnecessary but BYOND will runtime if a number is used
 			var/datum/language/L = GLOB.language_keys["[language_key]"]
+
+			// MULTILINGUAL_SPACE enforces a space after the language key
+			if(client && (client.prefs.multilingual_mode == MULTILINGUAL_SPACE) && (text2ascii(copytext(selection, 3, 4)) != 32)) // If we're looking for a space and we don't find one
+				continue
+
+			// MULTILINGUAL_DOUBLE_DELIMITER enforces a delimiter (valid prefix) after the language key
+			if(client && (client.prefs.multilingual_mode == MULTILINGUAL_DOUBLE_DELIMITER) && !is_language_prefix(copytext(selection, 3, 4)))
+				continue
+
+			if(client && (client.prefs.multilingual_mode in list(MULTILINGUAL_DEFAULT)))
+				selection = copytext(selection, 1, 3) // These modes only use two characters, not three
+
 			// It's kinda silly that we have to check L != null and this isn't done for us by can_speak (it runtimes instead), but w/e
 			if(L && can_speak(L))
 				// So we have a valid language invocation, and we can speak that language, let's make a piece for it
@@ -170,6 +182,10 @@
 			// This covers the case of "no prefixes in use."
 			prefixes[++prefixes.len] = list(get_default_language(), i, i)
 
+		// If multilingualism is disabled, then after the first pass we're guaranteed to have either found a language key at the start, or else there isn't one and we're using the default for the whole message
+		if(client && (client.prefs.multilingual_mode == MULTILINGUAL_OFF))
+			break
+
 	return prefixes
 
 /mob/proc/strip_prefixes(message, mob/prefixer = null)