Parse {} as an empty override block rather than an empty comment

Originally committed to SVN as r6164.

aegisub/src/ass_dialogue.cpp

@@ -243,34 +243,39 @@ wxString AssDialogue::GetSSAText () const {
 void AssDialogue::ParseASSTags() {
 	ClearBlocks();
 
+	// Empty line, make an empty block
+	if (Text.empty()) {
+		Blocks.push_back(new AssDialogueBlockPlain);
+		return;
+	}
+
 	int drawingLevel = 0;
 
-	const size_t len = Text.size();
-	size_t cur = 0;
-	size_t end = 0;
-	while (cur < len) {
+	for (size_t len = Text.size(), cur = 0; cur < len; ) {
 		// Overrides block
 		if (Text[cur] == '{') {
+			++cur;
 			// Get contents of block
 			wxString work;
-			end = Text.find("}",cur);
+			size_t end = Text.find("}", cur);
 			if (end == wxString::npos) {
 				work = Text.substr(cur);
-				end = len;
+				cur = len;
+			}
+			else {
+				work = Text.substr(cur, end - cur);
+				cur = end + 1;
 			}
-			else work = Text.substr(cur,end-cur+1);
 			
-			if (work.Find("\\") == wxNOT_FOUND) {
+			if (work.size() && work.Find("\\") == wxNOT_FOUND) {
 				//We've found an override block with no backslashes
 				//We're going to assume it's a comment and not consider it an override block
 				//Currently we'll treat this as a plain text block, but feel free to create a new class
 				AssDialogueBlockPlain *block = new AssDialogueBlockPlain;
-				block->text = work;
+				block->text = "{" + work + "}";
 				Blocks.push_back(block);
 			}
-
 			else {
-				work = work.substr(1,work.Len()-2); // trim { and }
 				// Create block
 				AssDialogueBlockOverride *block = new AssDialogueBlockOverride;
 				block->parent = this;
@@ -286,20 +291,19 @@ void AssDialogue::ParseASSTags () {
 					}
 				}
 			}
-
-			// Increase
-			cur = end+1;
 		}
-
 		// Plain-text/drawing block
 		else {
 			wxString work;
-			end = Text.find("{",cur);
+			size_t end = Text.find("{",cur);
 			if (end == wxString::npos) {
 				work = Text.substr(cur);
-				end = len;
+				cur = len;
+			}
+			else {
+				work = Text.substr(cur, end - cur);
+				cur = end;
 			}
-			else work = Text.substr(cur,end-cur);
 
 			// Plain-text
 			if (drawingLevel == 0) {
@@ -307,7 +311,6 @@ void AssDialogue::ParseASSTags () {
 				block->text = work;
 				Blocks.push_back(block);
 			}
-
 			// Drawing
 			else {
 				AssDialogueBlockDrawing *block = new AssDialogueBlockDrawing;
@@ -315,17 +318,8 @@ void AssDialogue::ParseASSTags () {
 				block->Scale = drawingLevel;
 				Blocks.push_back(block);
 			}
-
-			cur = end;
 		}
 	}
-
-	// Empty line, make an empty block
-	if (len == 0) {
-		AssDialogueBlockPlain *block = new AssDialogueBlockPlain;
-		block->text = "";
-		Blocks.push_back(block);
-	}
 }
 
 void AssDialogue::StripTags () {

aegisub/src/ass_karaoke.cpp

@@ -74,7 +74,7 @@ void AssKaraoke::SetLine(AssDialogue *line, bool auto_split) {
 
 		if (dynamic_cast<AssDialogueBlockPlain*>(block)) {
 			// treat comments as overrides rather than dialogue
-			if (block->text.size() >= 2 && block->text[0] == '{')
+			if (block->text[0] == '{')
 				syl.ovr_tags[syl.text.size()] += block->text;
 			else
 				syl.text += block->text;