So the idea is the next one: But lua has a specific way to treat weblink and it is right now impossible to use a web address as a string. The second clause supports a simple way to invoke the function from another module (such as from Module:Navbox), or from the debug console: Navbar.navbar({arg1 = 'foo', arg2 = 'bar'});. My own modules populate only the pre-alpha and alpha categories, but there are some here which I know have reached the other levels. I was just trying to return those hex tables via loadData and seem to have run into a nasty surprise. I didn't use Special:ExpandTemplates, though - I really did just forget my curly braces. Relevant to Lua, userscripts, and user scripting generally. 1 time resty -e 'ngx.re.find ("hello, world. Servicing Northern California For Over 25 Years, Select The Service Your Interested InDocument ShreddingRecords ManagementPortable StorageMoving ServicesSelf StorageOffice MovingMoving Supplies. Any suggestion on how to receive this parameter template as a table rather than a substituted string? ", [ [\w+\. At the moment, we have three patterns in naming a module sandbox page: I suggest that is one too much. Anyone interested in testing templates may want to try Module:Convert/tester which allows hundreds of tests to be easily defined. mw:Extension:Scribunto/Lua reference manual#mw.title.makeTitle, en:Module_talk:String#Replication on other wikis, http://commons.wikimedia.org/wiki/Commons:Lua/Modules, Help talk:Template#Counting items in numbered list, WT:WikiProject Templates#Counting items in numbered list, Wikipedia:Help desk#Counting items in numbered list, betawiki:MediaWiki:Scribunto-common-error-category/bn, mediawikiwiki: Extension:Scribunto/Lua reference manual #table.concat, Bug 50329 - We need a common repository for Scribunto modules and templates, Template:Year in other calendars/testcases, Module talk:Sandbox/Johnuniq/grosstonnage, Wikipedia talk:Lua style guide#CodeEditor switched to tabs, submit code to implement a ulimit-like mechanism on Windows, Special:WhatLinksHere/3000 United States Census, mw:Extension:Scribunto/Lua_reference_manual#Returning_text, Module:Sandbox/iantresman/sandbox/archive/mw.recursive, User:Iantresman/sandbox/archive/mw.recursive, Special:PrefixIndex/User:Mr. Stradivarius, Help:Lua_for_beginners#Initializing_a_table, updating some Lua modules can cause 7 million pages to be reformatted, Template_talk:Convert#Deploying updates now 18,000x slower, Wikipedia:Miscellany for deletion/Wikipedia:Lua/To do, https://en.wikipedia.org/w/index.php?title=Wikipedia_talk:Lua/Archive_1&oldid=1137418039, Creative Commons Attribution-ShareAlike License 3.0. It may sound like asking to be babysat or spoon-fed, but I'm totally stuck. Is there a programme wizard who can help see if I've done something stupid? You can do procedural, functional, OO programming. Lua has eight basic types: nil (undefined) boolean (boolean) number (numeric) string (string) If you notice that your C++ function has a huge overhead because of Lua calls, consider using this pattern: If you dont use local to define/init a variable, it becomes a global by default. This came up over at Template talk:Historical populations. To get automatic errors the L.Check(n int) family of functions can be used; They throw a Lua error if the type check fails. The message from MediaWiki:Movepagetext-noredirectfixer should warn about this, perhaps a warning like MediaWiki:Moveuserpage-warning. We now have the /doc system somewhat integrated/forced trough the Scribunto extension. Currently it is misleading advising to check for double redirects. The first question, of course, is whether we should require() at all. The easy part is 'getting rid of the function name': assuming p is the variable in the last line of the program, just say, However, I see no way to get rid of the pipe - it. Extra arguments are thrown away; If you used classes as globals (which Ive seen in many tutorials and real code), you might have a script like this: Suppose that you didnt execute some_class.lua first (which defines a global SomeClass). with nil arguments removed. Calling the LValue.Type() returns the corresponding LValueType. Wnt (talk) 15:52, 22 January 2014 (UTC), Wikipedia:Lua/To do, a page you substantially contributed to, has been nominated for deletion. If youre writing a game and want to make it possible for people to create mods, many of your players are likely to know Lua thanks to such games as Minecraft, Factorio, Garrys Mod, World of Warcraft, Roblox and. With a clear upsream in a central place like mediawiki.org then en.wiki and other Wikimedia projects could work better on local support and whatever is specific to their communities. Frietjes (talk) 00:03, 4 July 2013 (UTC), At the moment we have the {{lua talk}} template to use on talk pages of templates converted to Lua. My initial thought is that having a module named after a single string function may be a bit extravagant, so perhaps it would be better grouped with other similar functions, if those exist somewhere. This is typically done with a copyright template placed on your user page though you might want to modify one of them to specify that it only applies to Lua modules. The parser seems to reject any effort to initialize a table in the return statement if one of the indexes is, or could be, interpreted as a number. Please take a look at Module:RepeatString and Template talk:Repeat and see what you think. Writing the code in it feels like writing pseudocode/prototyping. To get the perf bit out of the way: the bridging code between C++/Lua has overhead compared to just calling Lua from Lua or calling C++ from C++. They are iteration functions, so they add the overhead of a function call to each loop iteration. These snippets of Python and Lua are roughly equivalent. If you notice that your C++ function has a huge overhead because of Lua calls, consider using this pattern: // in C++ sol::table t = lua.create_table (); for (int i = 0; i < 1000; i++) { // do stuff in C++, push data to Lua table occasionally } luaFunc (t); -- in Lua function someFunc (t) for k,v in pairs (t) do -- do stuff end end 5. First lets set up the environment and test that it works, start by install gopher-lua: Secondly lets create a minimal implementation: lua.NewState() creates our Lua VM, and it is though L (*lua.LState) we will interact with Lua in the future. Makyen, does that look something like what you wanted? Now you dont need to ship this init.lua with your binary and life becomes easier. In this case we will embed Lua using gopher-lua. The same can be said about making your program expandable with plugins. I think that this is less effective than it could be, however. Felicia Hagler - via Google, In the middle of a big move and so far Jay Casey has been immensely helpful to us with all the details! After the function call, --HectorMoffet (talk) 11:05, 29 December 2013 (UTC). *, I'd like to find out which mw.site library options are available, and print their value, without having to specify each one individually, ie. in Lua and functions defined in C. As we have seen in other examples, Text formatting (bold, italics) breaks when the ''/''' tags are not closed for each argument. The downside is it will incur a small performance impact every time a new page of callframes is allocated. Lua is written in ANSI C, so it can compile almost everywhere. P:S Creating separate module for template2 in above example is not feasible because I am trying to reduce the number of template substitution and writing separate modules would defeat the purpose.--Jayarathina (talk) 05:20, 24 December 2013 (UTC). Since Lua has lexical scope at the block level rather than the function level, this works similarly to the way Python calls __exit__. --Iantresman (talk) 11:31, 9 December 2013 (UTC), Can modules "call" other modules? Time-delay formula: The initial tests show a time-delay formula as roughly delay=3^(n/2000) seconds, where n is the number of parameters passed, and for n=6,000, the delay has been 3^3 or 27 seconds, or for n=7,000 then the delay has been 3^3.5 or 47 seconds. You can learn about how to use Lua C API here (or in the latest version of Programming in Lua) - the online version is written for Lua 5.1 and some things have changed since 5.1, but most concepts have stayed the same. Our compilation still gets rid of the run-time The tutorial I actually want is how a template with parser functions translate into a Lua module with explanation of what syntax equal what variable/function or whatever. Sorry if this was discussed before, but I did not find relevant links in a couple of minutes. The problem with 3rd party bindings is that they usually tend to get unmaintained or only support a specific version of the library. The general method that has been used is to assume a format for the page archive name and then test for the existence of all such possible pages using {{#ifexist:}}. The syntax of the template sends another template as parameter. This is not a tutorial or step-by-step guide. Is a module supposed to do something clever in order to output tags? I would generally recommend to avoid making high volume calls into Lua. in the second case, we use it as an expression: Lua also offers a special syntax for object-oriented calls, I see that I can access Mediawiki libraries as simple as "mw.stat", are modules on Wikipedia accessible as easily? For instance, consider the following function, to increment a global counter. This function has 1 as its default argument; that is, the call incCount (), without arguments, increments count by one. When you call incCount () , Lua first initializes n with nil ; the or results in its second operand; and as a result Lua assigns a default 1 to n . You signed in with another tab or window. but this fact has no relevance to Lua programmers. :) Wnt (talk) 08:16, 20 November 2013 (UTC), Can Lua take the contents of a Wiki page, and reprocess it? Throughout the post L will denote a pointer to lua.LState. The sandbox Wiki code {{Special:AllPages|namespace=666}} {{CURRENTTIMESTAMP}} returns a timestamp that changes each time the page is reloaded, because caching is disabled. The first clause supports the case where the module is being invoked from a template as {{#invoke: Navbar | navbar}}. In the example bellow sayHello function is first defined, and then called in the second call to DoString. the results which can be obtained by a user with the Special:PrefixIndex page)? Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. And be especially careful when using coroutines. That overhead might be removed if we made save/restore a built-in operation in Lua. ]], "jo")' But there is a catch. The less data is shared between C++ and Lua, the better. Think of Lua scripts as functions - you can call them with require or do_file and they can return variables. Otherwise empty string. for instance, Parameters work exactly as local variables, For instance, all library functions are written in C; See discussion at Village Pump (policy)#Protection and management of scripts?. What I'm trying to do is much more complicated, see Module:Convert/makeunits, but is the same issue. now i wanted to translate Category:Pages with script errors in bn language. It relies on Module:Sandbox/QuimGil/Flagicon, which provides the logics, and Module:Sandbox/QuimGil/FlagTranslations, where the flags data is stored. Installation You can download the latest release manually and include Enrique Garca Cota has a lot of great articles about Lua: http://kiki.to/. via middleclass library), dont do it like this: and then, when you want to create an instance of this class, you do this: Why do it like this? 3 This bytecode is converted into LLVM IR and then fed into Deegen, which can transform the functions to do tail calls correctly, use the GHC calling conventions, and a or compute and return values. For example, I might want to process the posts on a talk page, and add some extra formatting. Command line parameters, environment variables, and configuration files are common ways to change the behavior of software. string.format('%f %f %f', 0.00001, 1.2, 3) => 0.000010 1.200000 3.000000, string.format('%g %g %g', 0.00001, 1.2, 3) => 1e-05 1.2 3, This page was last edited on 4 February 2023, at 15:13. However, the basic API is quite simple, and the advanced features deserves its own post. Debresser (talk) 10:57, 8 December 2013 (UTC), Is the "Wikipedia namespaces" infobox necessary top right? Within C and C++, some comp ), The disadvantage of course is that bugfixes in modules like Redirect don't get passed on. I would use them again if needed. Incnis Mrsi (talk) 22:46, 9 January 2014 (UTC). You can find Luas reference manual here. Needs study to guarantee correctness! It behaves somewhat like a stack as in [Forth] but with one element. (In the case of Module:Redirect, when I look at the pages that link to it I could easily think, meh, it's not even used by 50 pages, why not start making a series of small edits as long as they preview OK? its number of parameters. mw:Extension:Scribunto/Lua reference manual, Getting started ("hello world") portion of the Lua reference documentation, Sumana Harihareswara, Wikimedia Foundation Engineering Community Manager, MediaWiki:Scribunto-doc-page-does-not-exist. is there a better way to do this? Result #3 works correctly. However, if we standardize this, with the names copied verbatim and the fairly distinctive capital letter after the /, it should be easy to have a bot notify the author(s) of Module:Submit an edit request automatically when Redirect is updated. For example: Instead I need to output: "0.00001 1.2 3". lua.CanConvToString(v LValue) - True if LString or LNumber. . try: with open("foo.txt") as f: Isnt it great? The advantages are a) edits to Redirect to add irrelevant features don't lead to massive queue usage, b) Redirect doesn't have to be protected, and c) in case a required module isn't protected, you don't get confused and fool around with a module you think is in limited use only to find out that you've created a huge server load. Putting the following into the debug window gives the values shown: I don't need the functionI'm just asking if it has a bug. / I ran some local tests and it seems pretty easy to crash it, but then again I'm running it in an unstable environment anyway so it may not reflect how things work here on Wikipedia. It can do everything youd ever want from Lua and even more. Example: L.GetTop() returns the number of arguments that was used when the function was called. Where I see this is commonly done is in the templates which return links to the archives of talk pages. If you create a local object inside the coroutine and store the reference to it in C++. Its a good starting point for making your own CMake build for Lua, though (or if you use older versions of Lua, they work well). -DePiep (talk) 23:30, 19 July 2013 (UTC), Do Module:WikiLink and voy:ru::Wikilinks effectively aim to do the same thing? Dont forget that you can do this: Now, when you load/execute this script, you will only get one function as the result: All the internal script state will be hidden and non-modifable and wont overwrite any global state in your current Lua state, which is great. Is it a good idea to deviate from the template standard of calling pages with testcases, tests for the module namespace? It uses heavy meta-programming to get things done. There is no reason to do it for functions which are already Learn more. In the first case, we use a function call as a statement; --Iantresman (talk) 18:29, 7 December 2013 (UTC), I used to be an above average template editor, making significant contributions to even such intricate template as Ambox and Fix. The XLua object also has a substantial MMF Interface for directly querying and modifying game objects and state If needed, custom metadata can safely be written to the metadata table; it is unique for each key and will persist for the duration of the load() call. Caution is desirable because it is very confusing for anyone reading the code later if tostring() does not do what it normally does, however the following is the idea. I've created a new request page for Lua scripts at Wikipedia:Lua requests. The reference manual for Lua 5.4s C API is here: https://www.lua.org/manual/5.4/manual.html#4, Github repo: https://github.com/ThePhD/sol2. This first edition was written for Lua 5.0. Immediately afterward it gives you another line of codes which I have absolutely no idea where to insert it to make it functional at all. sol2 is a fantastic library which Ive used for many years. Is there a way to obtain a list (array) of all pages with a prefix (e.g. For example (C++ functions have cpp postfix): Ask yourself: do all these functions need to be in C++? itch.io was written with it and it compiles to vanilla Lua. There is still lots of work to do of course, But it's a start TheDJ (talk contribs) 22:18, 18 March 2013 (UTC). I'd rather see useful LUA links. This code is OK (calling C++ from Lua is cheap): This code is not that good (calling Lua from C++ is slow): Profile first. Johnuniq (talk) 06:53, 11 October 2013 (UTC), Doesn't Wikipedia's version of Lua allow the GetURL function (or equivalent)? You choose what Lua code can and cant do. Makyen (talk) 05:58, 1 January 2014 (UTC), That makes sense. WebIt's more terse, though at the expense of the function call overhead. However: This overhead may be trivial compared to what the body of So tonight I put together Module:Unsubst, which can be used to do the same thing without all the limitations of {{unsubst}}. I would welcome comments, and if people think the scheme is OK, please consider rating your modules Wnt (talk) 23:31, 16 April 2013 (UTC), I have opened a discussion here: en:Module_talk:String#Replication on other wikis. :) Wnt (talk) 02:58, 6 January 2014 (UTC). Its neat. Just some of our awesome clients tat we had pleasure to work with. sign in Each layer of "shell templates" (to #invoke a Lua function) also increases the expansion depth by about +2 levels of the 41-level limit (shows "41/40"). For example, Module:Navbar contains the code: In what case would frame not be equal to mw.getCurrentFrame()? Everyone took really good care of our things. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. A cross between resources, documentation, and useful links. At least one such template will be beyond the 500 EPFs/page limit in 2015. I measured the overhead of direct and virtual C++ function calls on the Xenon PowerPC some time ago. If an argument to a function can be of more then one type the L.CheckTypes(n int, types LValueType) function can be used to check and yield an error to the user. WebThe Lua interpreter offers two hooks for debug purposes: typedef void (*lua_CHFunction) (lua_Function func, char *file, int line); extern lua_CHFunction lua_callhook; typedef void (*lua_LHFunction) (int line); extern lua_LHFunction lua_linehook; The first one is called whenever the interpreter enters or leaves a function. You are free to edit the content of Wikipedia:Lua/To do during the discussion but should not remove the miscellany for deletion template from the top of the page; such a removal will not end the deletion discussion. The system compares actual template output with fixed text, and is only suitable for templates and results that are reasonably short because each template and its expected result have to be in one line. This was possible because the wikimarkup language was very intuitive, and easy to understand even for the layman. It is superfluous if you only call the function once within the scope of the local variable, but that is pretty rare. Automatic insertion of the green 'chrome' of our template documentation. If a conflict can not be resolved in a satisfactory manner, the function should throw an error to signify this; returning false or nil will result in that value being written to the key. Perhaps li in a list or tr in a table? The process was smooth and easy. We really ought to decide, flip a coin, something so we get this sort of stuff to a predictable spot. Does someone have an idea how to code this feature? Wnt (talk) 15:56, 6 January 2014 (UTC). If you need a debugger, I recommend checking out. -- The parentheses remove the "number of changes" returned by gsub. Easy to start using, the interface is user friendly and feels similar to C++ standard library. Servicing Stanislaus, San Joaquin and Merced Counties, 2209 Fairview Drive Suite A Ceres, CA 95307. the colon operator. New versions come out once in a while, but you can comfortably stay on Lua 5.2 not loose much. Yes, you can replace built-in functions because they are simply functions accessed from global variables. is just another way to write o.foo(o, x), Integrating it with CMake is somewhat trickier. It receives a *lua.LState and returns an integer. I'm thinking by this point that it would be better to just develop an explicit tool to control caching, and some mechanisms (if they don't already exist) to audit what pages are not cached and identifying the worst reloaders) Wnt (talk) 15:48, 13 January 2014 (UTC). Clearly it's worth thinking about ways to reduce this impact as much as possible. I just quickly sorted out the present Lua modules to Wikipedia:Lua/Modules/Overview. Sandboxing is easy. Otherwise false. Its a road map for learning Lua and my advice for how to integrate it with C/C++ code. Right now I'm putting ratings on the documentation subpages, which I think is what someone suggested before at one point for categories. To learn Lua, read Programming in Lua by Roberto Ierusalimschy. You can write entire games in Lua without ever touching C/C++. Frietjes (talk) 16:17, 30 October 2013 (UTC). At Module:DisplayLuaTableContents I see numerous loops as, , but I learned that strings are immutable and hence this assignment is rather costly. Plastikspork (talk) 22:08, 2 November 2013 (UTC), I've created Module:Pagetype, a replacement for {{pagetype}}, and I am thinking of updating the template to the Lua version later on this week. (alright, the bot might miss that one, unless it knows to go back and check a template by the same name also, but you understand) My feeling is that if the reuser is going to put millions of pages on the queue, he should have the chance to decide whether he wants the latest update in the module to be passed along, or if it can wait. This will make your life easier, because you would be able to write less binding code and be able to stay inside Lua code as much as possible. I'd like to include some of the functionality of module:Page in my module, without having to reinvent the wheel. Mr. Stradivarius talk 16:45, 29 March 2013 (UTC), I decided to implement a Lua replacement for the innards of {{Repeat}} as a learning project for my first Lua module. The messages for /doc inclusion are currently added as contentlanguage, where really only their parameter should be included as such. They have a great system for tracking your belongings and a system for checking to make sure you got all of your belongings once you arrive at your destination. Wnt thinks that the template should use the "style" type (with a yellow background), and I think it should use the "notice" type (with a grey background). For instance, if we have a function like. Lua doesnt impose one style of writing code on you. Mr. Stradivarius talk 09:47, 11 November 2013 (UTC), I've updated Wikipedia:Lua/Modules/Overview using a Lua module to generate a table from various simple cut and paste data. You couldn't keep track of your old experiments, and my experience is that yes, I. We could also use the template to automatically add Category:Lua-based templates to keep track of converted templates more easily. Hard working, fast, and worth every penny! Functions are the main mechanism for abstraction of statements That's a bit of boilerplate code that I've been using in all the modules I write. Then, executing script.lua would resullt in an error: SomeClass is nil. The LState is needed for interacting with the Lua VM, most commonly for retrieving function arguments. I wonder if there's any actually helpful tutorial for those already familiar with Wikisyntax but without other computer language experience like Lua or C. The tutorials I found usually begin with a simple code to tell you to copy-and-paste (hello, world) then look at the outcome. The fact that even an IP user may edit the module namespace suggests that it must be really stable and secure. With your own bindings, you can control what version you use and how the exposed API looks in Lua. Mr. Stradivarius talk 12:54, 10 July 2013 (UTC), We have {{WikiProject Lua/header}} that does the header tabs (I started). 2015 Nils Lagerkvist. Ive used LuaDists CMake build scripts for Lua for many years, but LuaDist authors have stopped supporting newer Lua versions. I think it's worth checking back about how far we can go toward an ideal bare {{#invoke:SomeName}} format, since the extra parameter is only a nuisance/confusion to many non-Lua users. With those it's not entirely clear if they are meant to go together or not. If that is not possible: Please suggest an alternative method to implement it. You can easily print table contents with it: For example, Id recommend to avoid SDL/glfw/SFML bindings and writing them manually for the stuff you need. Greetings Stephan Kulla (talk) 15:54, 19 May 2013 (UTC), (Sorry for writing here. That would only apply to your contributions though, not to later modifications made by other editors. In short, if your coroutine gets GCed and you hold the reference to this local variable as a sol::object on the C++ side, it wont prevent the variable from getting GCed by Lua and your program crashing because of that. Is this a problem in my module or in Scribunto? This makes dependencies between files hard to track and require you to manually execute some_class.lua before you can execute script.lua. These variables are called the formal parameters of the function. The formal parameters behave like other local variables inside the function and are created upon entry into the function and destroyed upon exit. While creating a Lua function, you give a definition of what the function has to do. To get the perf bit I can acquire arguments using the frame.args object passed to a script using an iterator function: But this does not seem to work for a library such as mw.site. The redis instance enables the script to interact with the Redis server that's running Anomie 03:36, 1 November 2013 (UTC), User:Wnt and I have had a little disagreement over the type parameter of the {{lua}} template. Ginsuloft (talk) 13:39, 30 October 2013 (UTC), currently, in Module:Historical populations, I am using a somewhat convoluted method to access 'formatnum' which involves passing 'frame' and using 'callParserFunction'. It's just that a central repository would be so beneficial for everybody (en.wiki devs/editors included) and en.wiki can't really be (in my honest and personal opinion) that place. The overhead of a virtual function call was 13.2 nanoseconds, or 42 clock cycles, compared to inline. --Iantresman (talk) 14:50, 8 December 2013 (UTC). It is also possible to make the function a parameter if it comes from a defined list of choices - just load up your data and set a loop that p[xyz] = function(frame) return p.main(frame, xyz) end. I'm currently using the following function to get template arguments. Should I return a sequence of hundreds of strings relying on Scribunto in concatenating it? Hence, passing 2,000 parameters runs 3 seconds, 4,000 parameters runs 13 seconds, or 6,000 parameters run 27 seconds. Hence, for Lua, the alternative is to pass fewer parameters, but as strings of choices delimited by separator characters within each string. The #invoke speed in March 2013 has been about 180/second, compared to short templates running 350-600 per second, or parser functions >750/second, or character-insertion templates running 2,400/second. Much better! Given that each {{#ifexist:}} is an expensive parser function (EPF), these templates can consume an excessive number of EPFs. If so, I can add Module:WikiLink to d:Q14746829. I know we are quite far into WP:DEW territory here, but I'd appreciate it if people could comment at the discussion over at Template talk:Lua#Style. Thanks! Iterative multi-file loader, used to load all Lua modules in a directory and return them as one table. You might also find Moonscript interesting. What to write in Lua: gameplay logic, FSMs, cutscenes, etc. It stays global and doesnt get collected by a GC until it has been set to nil. thank you. I'm a rookie! WebTo call a Lua funcion, we first push the function onto the stack. :P Anyway, I have taken that idea and added some parameter checking and some documentation, and called it Module:User:Mr. Stradivarius/PrefixIndex. -- Gets numbers for row1, row2, etc. Please don't take those *personal* suggestions as a criticism to Wikipedia:Lua. The related, but separate issue, for speed of #invoke, can quicken every use of Lua, if 1.22wmf1 successfully doubles the speed of each #invoke. When programming in Lua, you may use constructors to avoid th ose initial rehashings. When you write {true, true, true} , Lua knows beforehand that the table will need three slots in its array part, so Lua creat es the table with that size. Thats basically all youll ever need to know about Lua. The function signature must match what you passed in. They both open a file, read one line, and close it, or do nothing if there was some error opening the file. It has a GNU Make build, so building it is easy. That way it would be obvious straight away which templates have been converted, and would help advertise the fact that we have this neat new programming language available and that we need people to convert existing templates over. Its minimalistic, but requires a lot of boilerplate and manual error-checking.

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lua function call overhead