If you only want to call some C/C++ functions from Lua (or some small Lua functions from C/C++) - use Lua C API. That overhead might be removed if we made save/restore a built-in operation in Lua. I get an error message when I use it. It has a GNU Make build, so building it is easy. I've been trying to use some of the other frame functions, and I can get them working via #invoke, but not through the debug console. Dcoetzee 23:09, 23 February 2013 (UTC), There's a discussion at the technical pump currently about where to put code that you're experimenting with; as a result Module:Sandbox has been created. The XLua object also has a substantial MMF Interface for directly querying and modifying game objects and state Wnt (talk) 15:56, 6 January 2014 (UTC). You couldn't keep track of your old experiments, and my experience is that yes, I. 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. d It can do everything youd ever want from Lua and even more. 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. GitHub ) --Iantresman (talk) 13:14, 8 December 2013 (UTC). 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. If so, I can add Module:WikiLink to d:Q14746829. They have lots of options for moving. Lua 5.4 The syntax of the template sends another template as parameter. Work fast with our official CLI. lua.LVAsString(v LValue) - Converts LString and LNumber to string. {\displaystyle d=3^{(n/2000)}.} --Iantresman (talk) 14:50, 8 December 2013 (UTC). 1 time resty -e '' We can see theres overhead of about 11 milliseconds on this machine. Can they be rewritten in Lua, perhaps? Iterative multi-file loader, used to load all Lua modules in a directory and return them as one table. 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. We have a lot of cases where related modules have the same name with "/" to indicate subpages, and some others where apparently related modules simply extend a name. lua Page content can be retrieved with the getContent () method of the title object. I think that this is less effective than it could be, however. - basically everything else that doesnt interact with low-level OS APIs much. E.g. You can download the latest release manually and include it in your project, or you can install it in your project directory through Luvit's package manager Lit, using the install command. The resty command itself has a startup and exiting overhead. --Jarekt (talk) 16:24, 14 March 2013 (UTC), Are module authors permitted to use other licenses (presumably in addition to the CC-BY-SA license) for modules they develop? WebLua scripts have the same capability with calling MMF events. We now have the /doc system somewhat integrated/forced trough the Scribunto extension. --Iantresman (talk) 11:31, 9 December 2013 (UTC), Can modules "call" other modules? Everyone took really good care of our things. Almost all of us to be a lot better about putting comments up front in the module and/or documentation saying what the heck our modules are FOR. Using the L.CheckTypes function equate to checking the type manually and then calling L.TypeError(n int, message string) if there is an error. Its minimalistic, but requires a lot of boilerplate and manual error-checking. Lua adjusts the number of arguments to the number of parameters, 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. Makyen (talk) 05:58, 1 January 2014 (UTC), That makes sense. for example, make this work without copying the args to a new table? If you need a debugger, I recommend checking out. Much better! I see that I can access Mediawiki libraries as simple as "mw.stat", are modules on Wikipedia accessible as easily? 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. 2015 Nils Lagerkvist. Formula: The first clause supports the case where the module is being invoked from a template as {{#invoke: Navbar | navbar}}. You're looking for performance in the wrong place. The problem with function calls is not that they cost much. There is another problem. Function c Keep your global state to a minimum and variable scope as small as possible. --Aftab1995 (talk) 15:50, 23 May 2013 (UTC), I'm very happy to announce that Template:FlagiconLua has reached feature parity with Template:Flagicon! The fact that even an IP user may edit the module namespace suggests that it must be really stable and secure. Local declaration of (built-in) Lua functions to reduce For example, I might want to process the posts on a talk page, and add some extra formatting. I have used the mw.title library with a call like mw.title.new(page_name):fullUrl({uselang=lang}), but mw.title.new() is marked as an expensive function so I would like to known if there are alternative.--Moroboshi (talk) 07:06, 18 May 2013 (UTC), Is there a way to use the Mediawiki API inside Lua? Johnuniq (talk) 02:22, 25 June 2013 (UTC). Integrating it with CMake is somewhat trickier. WebLua Functions - A function is a group of statements that together perform a task. I've been trying to get to grips with the concept of frames, and I think I'm almost there. With your own bindings, you can control what version you use and how the exposed API looks in Lua. We have an even split on people who do personal testing in Sandbox/ and people who do it in User: At this point, either of us could pull up stakes and migrate to the other pretty easily. There are some practical functions to convert and check lua.LValue objects. Incnis Mrsi (talk) 11:59, 2 July 2013 (UTC), Hi, your feedback is welcome at Bug 50329 - We need a common repository for Scribunto modules and templates. This makes dependencies between files hard to track and require you to manually execute some_class.lua before you can execute script.lua. For example (C++ functions have cpp postfix): Ask yourself: do all these functions need to be in C++? That is partly about performance but mostly about engine architecture. Mr. Stradivarius talk 23:06, 1 January 2014 (UTC); Page moved without redirect. It may sound like asking to be babysat or spoon-fed, but I'm totally stuck. FT2(Talk|email) 02:07, 20 March 2013 (UTC), I found this guide for learning how to code Lua, may be of help or use www.lua.org/pil/contents.html#P1, I feel like I must have reinvented the wheel here, but I copied Template:Tlx to Template:Mlx with minor modifications, so we can type, and get {{#invoke:ConvertNumeric|decToHex|99 33}}, It would be good if someone could look this over for any flaws before it gets cascade-protected by something. For example, it is not printing the string "mw.site.currentVersion", and only two "mw.site.stats" table rows, which might suggest it is not recursing properly, or perhaps something else. Within C and C++, some comp I've taken some steps to bring it partially in line with our Template documentation system. A fixed size callstack has the highest performance and has a fixed memory overhead. You can call it with LuaJITs FFI, see the tutorial here. See the demos and more details at WikiProject Flag Template. WebDue to the short-circuiting behavior of or, it will generally impose little additional overhead at call-time: local soundit; do local sounds; function soundit (x) sounds = sounds or { a = "ay" , b = "bee" , c = "see" , . } assert ( type (x) == "string" ) return sounds [x] end end These snippets of Python and Lua are roughly equivalent. : Overusing them makes code harder to understand because now you need to make sure that the object youre are pointing to doesnt change unexpectedly. thank you. The parameters object takes three important parameters: Fn - the lua.LFunction to call Nret - The number of returned values Protect - If protect is true an error is returned, otherwise a panic will occur. with nil arguments removed. How much do function calls impact performance? 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. now i wanted to translate Category:Pages with script errors in bn language. --SocietyBox (talk) 02:26, 20 January 2014 (UTC). 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'});. The function signature must match what you passed in. Lori Baker - via Google. I'm a happy user of this space myself with the pet projects I develop in my free time. 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. {{. Thanks. Anomie 03:36, 1 November 2013 (UTC), User:Wnt and I have had a little disagreement over the type parameter of the {{lua}} template. to use Codespaces. Is this the right place for Lua programming queries? A complete example looks like this: The LState defines some convenience functions, in the example above we are using L.ToInt(1) to fetch the first function argument. If anyone could help me to work this out I'd be very grateful. Iterative multi-file loader, used to load all Lua modules in a directory and return them as one table. sol2 is a fantastic library which Ive used for many years. Do I need to use %f and remove the trailing zeros with string.match or string.gsub? In Chapter 16 we will discuss such calls 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. For instance, all library functions are written in C; Comments appreciated. OUR MISSION. n There is no reason to do it for functions which are already I used their packing and moving service the first time and the second time I packed everything and they moved it. or subroutine in other languages) I'd like to include some of the functionality of module:Page in my module, without having to reinvent the wheel. My new test module Module:Sandbox/iantresman/sandbox/archive/mw.recursive prints out "frame.args" arguments passed to it, but is not recursively printing "mw.site" library functions/table when accessed from User:Iantresman/sandbox/archive/mw.recursive. This was possible because the wikimarkup language was very intuitive, and easy to understand even for the layman. They both open a file, read one line, and close it, or do nothing if there was some error opening the file. Because the property from Wikidata is not updated by mw.message, I decided to try it on one of those pesky Special: pages that abolish caching. I don't know, but with some of these things being transcluded on every page in the wiki, and having elaborate powers to write anything they can slip by the interface, we should be wary of security holes, and the first step is to know quickly and certainly which are a unit, I think. Is a module supposed to do something clever in order to output tags? I'm a rookie! It behaves somewhat like a stack as in [Forth] but with one element. 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. Automatic insertion of the green 'chrome' of our template documentation. Johnuniq (talk) 22:58, 10 January 2014 (UTC). Embedding Lua in Go Thank you for your attention!--Qgil (talk) 21:16, 2 July 2013 (UTC), I created Module:Testcase table, and it seems to work pretty well (see the current transclusions). 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. Writing the code in it feels like writing pseudocode/prototyping. While running tests to simulate a large #switch function of 3,000 branches, I repeatedly confirmed how passing thousands of parameters is typically exponentially slower beyond the first 500 parameters. For optional arguments the L.Opt(n int, default T) functions can be used. You can find Luas reference manual here. Use Git or checkout with SVN using the web URL. That would only apply to your contributions though, not to later modifications made by other editors. (At least script error should be shown when print function is detected.) However, the basic API is quite simple, and the advanced features deserves its own post. the colon operator. I measured the overhead of direct and virtual C++ function calls on the Xenon PowerPC some time ago. 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. *, 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. For example, suppose that you have C++ code like this: Your engine will crash on startup if init.lua is not found when your game starts (or contains errors). Is this a problem in my module or in Scribunto? !) 16:39, 24 February 2013 (UTC), the following code is arguably better than the current one;-) [Note: It also highlights more Lua features - assertion, type checking, local scoping, tail call recursion etc. -happy5214 14:32, 15 March 2013 (UTC), You own the copyright, you can grant whatever licenses you want (in addition, as you say, to the CC-BY-SA license that you've already granted). Youre unlikely to run into performance issues, unless youre making a AA/AAA game or a complex simulation program. Similarly to the previous advice, when defining classes (e.g. Casey Moving Systems is family owned and has been servicing Northern California for over 25 years. Many 3rd party Lua libraries usually work with Lua 5.2/5.3/5.4. 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). 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. ]], "jo")' But there is a catch. --Rotpunkt (talk) 12:35, 1 May 2013 (UTC), Hello, I'm wondering if there is currently a module that counts elements on a page. The typecheck function could also store away the type info for later introspection. in the second case, we use it as an expression: Lua also offers a special syntax for object-oriented calls, XLua Documentation - Taloncrossing Even if you do, with LuaJIT youll be able to achieve C/C++ level performance. What to write in C++: collision detection, path finding, physics, renderer and other things that are performance critical. Can one call lua function that returns sevaral strings and pass them to a template? Otherwise empty string. The gopher-lua library operates on a interface called LValue. The approach of Module:Sandbox - having every user put scripts into a common receptacle - seems unworkable. I am trying to create a weblink by concatenating 2 strings and by avoiding the display of the full link in an infobox. We really ought to decide, flip a coin, something so we get this sort of stuff to a predictable spot. --HectorMoffet (talk) 11:05, 29 December 2013 (UTC). The parameters object takes three important parameters: The following code defines a concat function in Lua. During operation, in the event that any functions share the same name, a table will be created with that name and the conflicting functions will be stored there using the name of the script they came from, such that with two scripts foo and bar, both containing the function foo, you would end up with the functions foo.foo and foo.bar. 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. 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. Writing code like this will become better with new #embed directive in future C/C++ versions, e.g. Please comment over there if you're interested. -- Gets numbers for row1, row2, etc. The docs are fantastic too. WebLua programs can emit signals using the function call syntax. Its simple. Then we call the function with lua_call (). 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. Lua Its much easier to test if something is non-nil or has a specific type/fields in Lua than in C++. I was just trying to return those hex tables via loadData and seem to have run into a nasty surprise. 2000 You dont need to compile Lua code, which means that you can change parts of your program/game logic without recompiling and even without reloading your program. You can call a function with a number of arguments different from It relies on Module:Sandbox/QuimGil/Flagicon, which provides the logics, and Module:Sandbox/QuimGil/FlagTranslations, where the flags data is stored. WebTo call a Lua funcion, we first push the function onto the stack. You can divide up your code into separate functions. For variety, and to match the fact that if you know what values you are dealing with you might have some "ifthenelse" statements to handle them, I did the format slightly differently. I tried to start learning Lua and immediately hit the wall after the "hello, world" part and all I got afterward are "script error". This code is OK (calling C++ from Lua is cheap): This code is not that good (calling Lua from C++ is slow): Profile first. ), The disadvantage of course is that bugfixes in modules like Redirect don't get passed on. Please take a look, critique it, test it, and let me know if there is anything that should change before I look at deploying it to some of the maintenance templates. Technical 13 (talk) 12:12, 9 May 2013 (UTC). A [6] question at Module:Redirect reminded me of a remarkable statement by @Wikid77: that updating some Lua modules can cause 7 million pages to be reformatted on the WP:Job queue. 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'. a function definition has a conventional syntax; Now the tab "Modules" does not show all modules, and does not have a 'next page' link. its hard to know if what youre passing to Lua will be copied or passed by a reference). Of course, you can check for this files existence and handle errors appropriately (e.g. 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. [feature X] (images/feature-x.png) Multi-MC Simulation 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. But what I'd like to ask now is: as a matter of general policy, does it ever make sense to link from a module that is in such widespread use that it needs to be protected to the current copy of another module? Lua is written in ANSI C, so it can compile almost everywhere. Then, see if you really need to move this code (or parts of it) to C++. for instance, Parameters work exactly as local variables, I've created a new request page for Lua scripts at Wikipedia:Lua requests. For example, Module:Navbar contains the code: In what case would frame not be equal to mw.getCurrentFrame()? See the explanation on how to do concurrency in Lua in sol2 here (especially about lua_xmove and sol::main_object). Calling Lua code is done through L.CallByParam, which takes a parameters object, P, and arguments as variadic parameters. Just some of our awesome clients tat we had pleasure to work with. You can do procedural, functional, OO programming. Please Your help pointing to ways to improve is welcome. With those it's not entirely clear if they are meant to go together or not. 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. lua after imported i find error in article with this Category:Pages with script errors. Thank you!--QuimGil (talk) 07:52, 21 June 2013 (UTC). Cya. You signed in with another tab or window. Preceding unsigned comment added by Ryn78 (talk contribs) 03:27, 13 October 2013 (UTC), Is it possible for a module to invoke another module? What to write in Lua: gameplay logic, FSMs, cutscenes, etc. Ive written many articles about using Lua with C++ on my old blog many years ago. GitHub - Samur3i/direct-loader: Requires all Lua files in a This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. -- Don't need the "%. On each conflict, this function will be passed the conflicted key, the current value that load() is attempting to save, the value that is currently stored in the conflicted key, and a table of metadata consisting of the following: Please note that these keys are created and updated automatically by load() and should not be altered manually. Servicing Stanislaus, San Joaquin and Merced Counties, 2209 Fairview Drive Suite A Ceres, CA 95307. Calling Lua Functions - Game Dev Geek If you'd like to make a request, please do that too! may be relevant to this problem. The NewPP parser hits the huge delays when passing 6,000 parameters whether to Lua, or to a template, or to a #switch parser function of 6,000 "|x=" branches. Stormworks Lua with LifeBoatAPI If you create a local object inside the coroutine and store the reference to it in C++. Dealing with C++ objects in Lua is much harder than dealing with native types. ?0" here but useful if omit above. The LState is needed for interacting with the Lua VM, most commonly for retrieving function arguments. Is there a programme wizard who can help see if I've done something stupid? For example: Instead I need to output: "0.00001 1.2 3". Page contents not supported in other languages. I would generally recommend to avoid making high volume calls into Lua. The functions in question had a single parame There are still a few things I'm not sure about, though. To be sure, this is the strip marker for a current time function, but I'm thinking this is either a bug or a feature, and we should figure out which! These functions does not throw errors, but will return Go default values if conversion is not possible. So its better to do it on Lua side, unless you make a C++ API which has to accept tables for ease-of-use - then you dont have much choice (but you can still wrap them into Lua functions and call C++ function internally). In Module:Sidebar, I extended the boilerplate further to allow a third way, invoking the module from a template and passing args in explicitly (instead of using whatever args were passed to the template), like {{#invoke: Navbar | arg1 = foo | arg2 = bar}}. I want to output wikitext like this: I have previously done that and it worked well, but when the text between the tags is more varied, something breaks. . Mr. Stradivarius talk 12:54, 10 July 2013 (UTC), We have {{WikiProject Lua/header}} that does the header tabs (I started).