Restore to commit 74e578279624c6045ca440a3459ebfa1f8d54191

scripts/_balance_check_py.py

@@ -0,0 +1,20 @@
+with open('chat/public/builder.js','r',encoding='utf8') as f:
+    s=f.read()
+paren=brack=brace=0
+backtick=False
+for i,c in enumerate(s):
+    if c=='`': backtick=not backtick
+    if not backtick:
+        if c=='(': paren+=1
+        if c==')': paren-=1
+        if c=='[': brack+=1
+        if c==']': brack-=1
+        if c=='{': brace+=1
+        if c=='}': brace-=1
+    if paren<0 or brack<0 or brace<0:
+        print('mismatch at',i,'char',c,'counts',paren,brack,brace)
+        # print context
+        start=max(0,i-100); end=min(len(s),i+100)
+        print(s[start:end])
+        raise SystemExit(1)
+print('final',paren,brack,brace,backtick)