refine blocks detection

src/parser.ts

@@ -233,6 +233,9 @@ export class EftlParser {
             case TokenType.VALUE_OF:
             case TokenType.SIZE_OF:
             case TokenType.HEADER:
+                if (!token.value.endsWith('/]')) {
+                    this.pushBlock(token);
+                }
                 this.advance();
                 break;
 
@@ -249,6 +252,9 @@ export class EftlParser {
     }
 
     private pushBlock(token: Token): void {
+        if (token.value.endsWith('/]')) {
+            return; // It's self-closing, don't push to stack
+        }
         this.blockStack.push({ type: token.type, token });
     }
 
@@ -295,6 +301,9 @@ export class EftlParser {
             [TokenType.TRIM_OPEN]: '[/TRIM]',
             [TokenType.CONTAINS_OPEN]: '[/CONTAINS]',
             [TokenType.FORMAT_OPEN]: '[/FORMAT]',
+            [TokenType.VALUE_OF]: '[/VALUE_OF]',
+            [TokenType.SIZE_OF]: '[/SIZE_OF]',
+            [TokenType.HEADER]: '[/HEADER]',
             [TokenType.EXPR_OPEN]: '%]',
             [TokenType.EXPR_OUTPUT_OPEN]: '%]',
             [TokenType.COMMENT_OPEN]: '--]'