Lua报错排查求助：加载缓冲区失败，语法缺失'}'

Hey Gary, let's dig into this Lua error you're stuck with. First, let's unpack what the error message is telling you:

Cannot load buffer. [string "LuaMacros script"]:191: '}' expected (to close '{' at line 85) near '['

This means the Lua parser hit a [ character at line 191, but it was still waiting to close a { opened back at line 85. The parser gets confused because the code structure is broken—think of it like forgetting to close a book before trying to open a new one.

Most Likely Causes & Fixes #

Let's break down the top issues to check:

1. You mixed up Lua syntax with another language (common gotcha!)
   Lua doesn't use {} to wrap function bodies, if blocks, or loops—those use end instead. {} is only for table constructions. If line 85 looks something like this:

   sendToAHK = function (key) { -- ❌ Wrong! Lua doesn't use { for function blocks
   

   That's the root problem. The parser sees { and thinks you're starting a table, but the rest of your function code doesn't fit that structure, leading to a never-ending search for a matching }. Fix this by removing the opening { and closing any function/block with end instead:

   sendToAHK = function (key) -- ✅ Correct Lua function start
       -- print('It was assigned string: ' .. key)
       -- Fix your file path too (Lua needs double backslashes for Windows paths!)
       local file = io.open("C:\\Users\\TaranWORK\\Documents\\GitHub\\2nd-keyboard-master\\LUAMACROS\\keypressed.txt", "w")
       -- Your other code here...
       if file then
           file:write(key)
           file:close() -- Don't forget to close the file!
       end
   end -- ✅ Close the function with end
   

2. Mismatched nested {} (for tables)
   If line 85 does start a valid table (e.g., local myTable = {), then you have a missing } somewhere between lines 85 and 191. Nested tables are easy to mess up—for example:

   local config = {
       keys = {
           ["a"] = "ctrl+a"
           -- Oops! Missing a comma here, or a closing } for the keys table
       -- Missing the closing } for config
   

   To fix this, go line by line from 85 onward, counting each { and matching it with a }. You can also comment out chunks of code between 85 and 191 to narrow down exactly where the missing } should be.

3. Unclosed strings or broken comments
   A forgotten quote or malformed comment can throw off the parser's ability to read brackets correctly. For example, your file path uses single backslashes (\)—in Lua strings, \ is an escape character, so \U would try to escape the U and might accidentally break the string closure. Always use double backslashes (\\) for Windows file paths in Lua, as shown in the fixed code above.

Quick Debugging Trick #

If you're struggling to find the mismatch, comment out the entire block from line 86 to 191. If the script loads without errors, you know the problem is in that section. Then, uncomment chunks of code one at a time until the error reappears—this will pinpoint the exact line where the bracket structure breaks.

内容的提问来源于stack exchange，提问作者Gary