Preceding unsigned comment added by Ryn78 (talk contribs) 03:27, 13 October 2013 (UTC), Is it possible for a module to invoke another module? that is, to call o.foo adding o as a first extra argument. A fixed size callstack has the highest performance and has a fixed memory overhead. 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'});. --SocietyBox (talk) 02:26, 20 January 2014 (UTC). 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. Dont put too much code into one script - its easy to separate everything into smaller scripts. What is the equivalent of {{fullurl:page name}}? Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. [feature X] (images/feature-x.png) Multi-MC Simulation 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! Enrique Garca Cota has a lot of great articles about Lua: http://kiki.to/. In the first case, we use a function call as a statement; Can Lua scripts access the username of the logged in user? For instance, if we have a function like. 3 Also explains why the uselang=qqq hack doesn't work to show the scribunto messages. Embedding Lua in Go :) Wnt (talk) 02:58, 6 January 2014 (UTC). {{. Technical 13 (talk) 12:12, 9 May 2013 (UTC). 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. A Go function should implement the LGFunction type to be callable from Lua. Local declaration of (built-in) Lua functions to reduce Dealing with C++ objects in Lua is much harder than dealing with native types. To simplify comparisons, when comparing metadata the following can always be assumed to be true: From this data or according to any other criteria, the handler function should resolve the conflict by returning the value that should be written to the conflicted key. and expressions in Lua. The value of any of these keys will never be. In Lua, all arrays are 1-indexed, however t[0] is still valid but that would result in the lenght of the array to be off-by-one. in Lua and functions defined in C. As we have seen in other examples, Otherwise true. I'm a rookie! Often the linked module contains bells and whistles that aren't really necessary; why not bring it into the module and slim it down? Maybe. The compiler might decide "hey, this function is only called a few times, and I'm supposed to optimize for speed, so I'll just inline this f Is this a problem in my module or in Scribunto? 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. Makyen(talk) 04:02, 8 May 2014 (UTC), I've heard for quite a while that the Lua scripts only run when the page is parsed, which rules out many interactive features but is efficient. Hence, for Lua, the alternative is to pass fewer parameters, but as strings of choices delimited by separator characters within each string. How about expanding the template's function so that we can also put at the top of template /doc pages? 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. 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. It would be a bit odd. Writing code like this will become better with new #embed directive in future C/C++ versions, e.g. You can find Luas reference manual here. 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. We are proud to provide our customers with these services and value by trained professionals. The process was smooth and easy. 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). how can i do this (on which module, i find this Category for translation). You might also find Moonscript interesting. It uses heavy meta-programming to get things done. Thank you!--QuimGil (talk) 07:52, 21 June 2013 (UTC). I just quickly sorted out the present Lua modules to Wikipedia:Lua/Modules/Overview. Johnuniq (talk) 09:37, 7 October 2013 (UTC). Any suggestion on how to receive this parameter template as a table rather than a substituted string? For instance, all library functions are written in C; Its minimalistic, but requires a lot of boilerplate and manual error-checking. That would only apply to your contributions though, not to later modifications made by other editors. We could also use the template to automatically add Category:Lua-based templates to keep track of converted templates more easily. I'd rather see useful LUA links. Ive written many articles about using Lua with C++ on my old blog many years ago. WebThe Redis Lua execution context always provides a singleton instance of an object named redis . Wikipedia talk:Lua/Archive 1 Or is it something else? ), The disadvantage of course is that bugfixes in modules like Redirect don't get passed on. It can do everything youd ever want from Lua and even more. 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. Currently, there are a reasonable number of templates that try to determine if any of a set of pages exist in order to provide links to those pages. To maintain similarity with other sandbox pages (in template space and user space), I propose: If we agree on this, we can encourage/discourage patterns. I would have been able to continue contributing to these and other interesting templates. For infoboxes, which use just a few Lua functions, then running the shell-template versions, rather than direct #invoke in the infobox, would be efficient enough, but still must beware the +2 expansion depth when running a shell-template version instead of direct #invoke in the infobox. Long story short, the overhead of a direct (non-virtual) function call was approximately 5.5 nanoseconds, or 18 clock cycles, compared to an inline function call. The overhead of a virtual function call was 13.2 nanoseconds, or 42 clock cycles, compared to inline. These timings are likely different on different processor families. functions This is a matter of implementation of the compiler or runtime (and its options) and cannot be said with any certainty. Comments appreciated. OUR MISSION. 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. I bypassed the most serious problem, but for some reason the method is generating incoming links to nonexisting articles. Where I see this is commonly done is in the templates which return links to the archives of talk pages. In the example bellow sayHello function is first defined, and then called in the second call to DoString. What functions should be called in C++ gameloop from (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? There is no reason to do it for functions which are already Perhaps li in a list or tr in a table? I also worked on a fork of LuaJIT professionally and described my experiences here - this experience made me learn a lot about LuaJIT and how vanilla Lua works (and how it can be used in production for servers with a very high QPS). powered by Hugo 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? -DePiep (talk) 11:51, 22 March 2013 (UTC). 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. Your opinions on the matter are welcome; please participate in the discussion by adding your comments at Wikipedia:Miscellany for deletion/Wikipedia:Lua/To do and please be sure to sign your comments with four tildes (~~~~). Its much easier to test if something is non-nil or has a specific type/fields in Lua than in C++. Are you sure you want to create this branch? --Iantresman (talk) 14:50, 8 December 2013 (UTC). Hence, passing 2,000 parameters runs 3 seconds, 4,000 parameters runs 13 seconds, or 6,000 parameters run 27 seconds. Much better! (and object-oriented programming) in more detail. 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. DePiep (talk) 23:55, 21 May 2015 (UTC). Debresser (talk) 10:57, 8 December 2013 (UTC), Is the "Wikipedia namespaces" infobox necessary top right? Makyen, does that look something like what you wanted? extra parameters get nil. This was possible because the wikimarkup language was very intuitive, and easy to understand even for the layman. Mr. Stradivarius talk 12:54, 10 July 2013 (UTC), We have {{WikiProject Lua/header}} that does the header tabs (I started). Redis Lua API reference | Redis You choose what Lua code can and cant do. A tag already exists with the provided branch name. Mr. Stradivarius talk 23:06, 1 January 2014 (UTC); Page moved without redirect. If that is not possible: Please suggest an alternative method to implement it. At least one such template will be beyond the 500 EPFs/page limit in 2015. Our compilation still gets rid of the run-time the results which can be obtained by a user with the Special:PrefixIndex page)? lua.LVAsString(v LValue) - Converts LString and LNumber to string. The function signature must match what you passed in. Just some of our awesome clients tat we had pleasure to work with. 2000 Is this the right place for Lua programming queries? Of course, you can check for this files existence and handle errors appropriately (e.g. Servicing Northern California For Over 25 Years, Select The Service Your Interested InDocument ShreddingRecords ManagementPortable StorageMoving ServicesSelf StorageOffice MovingMoving Supplies. 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. 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. These snippets of Python and Lua are roughly equivalent. This is not a tutorial or step-by-step guide. the colon operator. a find-and-replace Macro that lets you write code that acts like a function, without the function overhead running an external image to lua tool, so you can just stick the images in your Project folder, and automatically include them into your lua script every time you hit F7 ! It may sound like asking to be babysat or spoon-fed, but I'm totally stuck. What can I do to increase the performance of a Lua I've created a new request page for Lua scripts at Wikipedia:Lua requests. If you create a local object inside the coroutine and store the reference to it in C++. 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. 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). "factorial: argument must be a number >= 0", -- likely something like 1=foo=bar, we need to do it as a named arg. The approach of Module:Sandbox - having every user put scripts into a common receptacle - seems unworkable. Result #3 works correctly. The function is followed by the arguments, in order. So tonight I put together Module:Unsubst, which can be used to do the same thing without all the limitations of {{unsubst}}. We really ought to decide, flip a coin, something so we get this sort of stuff to a predictable spot. Wnt (talk) 15:52, 22 January 2014 (UTC), Wikipedia:Lua/To do, a page you substantially contributed to, has been nominated for deletion. A language variable can contain values of any type. You just compile a bunch of C files, link with the library and youre ready to go - you dont need to rewrite half of your program/game or make your build script 10 times more difficult. Have there been any major incidents yet? Older versions of Lua created empty tables with some pre-all ocated slots (four, if I WebLua programs can emit signals using the function call syntax. If you wish to retain the metadata for logging or other purposes, the entire metadata table is returned as the third return value from load(), containing the metadata for every key that was operated on (including those with no conflicts). Normally this wouldn't be an issue, except I was wondering if you write a Lua module that requires another Lua module or mw.title.new()s a data file, is the target module or file protected when the main module is cascade-protected? Integrating it with CMake is somewhat trickier. Gut feeling is usually wrong. lua.LVAsBool(v LValue) - Convert to bool, nil and false becomes false. Is there a way for a loadData table to contain these keys? -DePiep (talk) 23:30, 19 July 2013 (UTC), Do Module:WikiLink and voy:ru::Wikilinks effectively aim to do the same thing? ?0" here but useful if omit above. 2015 Nils Lagerkvist. It Is Me Here t / c 15:08, 3 September 2013 (UTC). The simplest language I know. See http://godoc.org/github.com/yuin/gopher-lua#LTable for the LTable Go API. The parameters object takes three important parameters: The following code defines a concat function in Lua. Iterative multi-file loader, used to load all Lua modules in a directory and return them as one table. may be relevant to this problem. sign in Now, with this new LUA language, template editing is becoming more and more the domain of technicians. Use Git or checkout with SVN using the web URL. Support for calling a parser function is coming soon with frame:callParserFunction, or you could do it today by passing the markup to frame:preprocess. Lua Of course, the specific delay depends on server load, but follows the general exponential slowdown formula, where 7,000 parameters is far slower than a linear extension of 7000/6000 or 17% slower, and runs closer to 47 seconds (+70% slower) rather than 27+17%=31.6 seconds. 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. 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. Keep your global state to a minimum and variable scope as small as possible. 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. Makyen (talk) 05:58, 1 January 2014 (UTC), That makes sense. --Vriullop (talk) 11:07, 22 March 2013 (UTC). Also, your feedback here about the best way to organize the data is also welcome. Providing global relocations solutions, storage and warehousing platforms and destruction plans. With those it's not entirely clear if they are meant to go together or not. Can they be rewritten in Lua, perhaps? -- Don't need the "%. A surprisingly simple Lua compilerExtended version Lori Baker - via Google. He has also implemented a number of incredible little libraries which Ive used in my projects: Many other great libraries can be found via LuaRocks: https://luarocks.org/. 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! -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). This code is OK (calling C++ from Lua is cheap): This code is not that good (calling Lua from C++ is slow): Profile first. Lua adjusts the number of arguments to the number of parameters, with nil arguments removed. However, after writing up Module:Hex, which hex dumps the contents of strings, I was looking at the talk page when I noticed that the hex-dump of the contents of a strip marker (the example with UNIQ QINU) are changing every single time I hit the Talk tab or browser reload button to reload the page, even when I'm completely logged out with scripts disabled! also, if someone already wrote a module that does the same thing, let me know and I will have this one deleted. Thanks. If you think that your game became slow because of Lua code, profile first before rewriting it in C++. Johnuniq (talk) 02:22, 25 June 2013 (UTC). Can templates, MediaWiki pages or parser functions be called from Lua? Then, executing script.lua would resullt in an error: SomeClass is nil. And you can do even better, you can hide library details and not expose them to Lua at all which will make switching between lower-level frameworks much easier, for example: If you want to use a C library and youre using LuaJIT, you dont even need to create a binding for it at all. See discussion at Village Pump (policy)#Protection and management of scripts?. That overhead might be removed if we made save/restore a built-in operation in Lua. The first question, of course, is whether we should require() at all. It receives a *lua.LState and returns an integer. Now you dont need to ship this init.lua with your binary and life becomes easier. lua.LVIsFalse(v LValue) - Returns true if nil or false. Running the Go code will yield: To run a Lua file, instead of a string, call lua.DoFile, DoFile and DoString can be called several times, and thus it can be utilized to expose Lua function. The body of the compiled Lua function consists of a series of function calls to the helper functions, one per instruction. . NeoVim, which uses Lua scripts for user script code. mw.site.currentVersion, mw.site.scriptPath, etc etc. Theyre mostly written in C/C++ and only expose a bunch of Lua functions/tables to the user. --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 first clause supports the case where the module is being invoked from a template as {{#invoke: Navbar | navbar}}. If those restrictions are not a problem, the new tester provides a convenient way to set up tests on any page, for example: If the above tests were at page "Template:Example/tests", the following would insert a table showing the results of expanding each template and comparing its output with the expected text. To do this it calls the Lua bytecode compiler and then it converts the bytecode to C. For each function in the module, the code generator produces an appropriate function header and then it iterates over the functions bytecodes, outputting a block of C code for each instruction. 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. The messages for /doc inclusion are currently added as contentlanguage, where really only their parameter should be included as such. Think of Lua scripts as functions - you can call them with require or do_file and they can return variables. Work fast with our official CLI. thank you. How do I fix this? 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. Easy to start using, the interface is user friendly and feels similar to C++ standard library. There are a number of To(n int) functions available. Lua has eight basic types: nil (undefined) boolean (boolean) number (numeric) string (string) as it does in a multiple assignment: The returned integer defines how many return values has been pushed to the Lua stack. Does this apply if you are accessing the module from another Lua module, and not directly from a wiki page? Everyone took really good care of our things. 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. I didn't use Special:ExpandTemplates, though - I really did just forget my curly braces. 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. --Iantresman (talk) 13:14, 8 December 2013 (UTC). I'm currently using the following function to get template arguments. John Victor - via Google, Very nice owner, extremely helpful and understanding -Wikid77 (talk) 19:29, 22 March 2013 (UTC), When moving a module there is no redirect left behind and existing invocations should be fixed. For optional arguments the L.Opt(n int, default T) functions can be used. Currently it is misleading advising to check for double redirects. You can divide up your code into separate functions. You can call a function with a number of arguments different from Its fast. 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. (what is sometimes called procedure I was just trying to return those hex tables via loadData and seem to have run into a nasty surprise. An expression like o:foo(x) Isnt it great? 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. They are iteration functions, so they add the overhead of a function call to each loop iteration. I get an error message when I use it. there is no difference between functions defined But with the banning of the print function and the extra steps to validate the lua code in Wiki, I can't tell if the lua.org tutorial truly helpful to me as I don't know how to convert all those examples to comply with MediaWiki's lua standard. The LState is needed for interacting with the Lua VM, most commonly for retrieving function arguments. The overhead of a virtual function call was 13.2 nanoseconds, or 42 clock cycles, compared to inline. 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). L.DoString runs the Lua code in the VM. --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. Our areas of expertise include Commercial Moving Services, Warehousing, Document Shredding and Storage Solutions. Clearly it's worth thinking about ways to reduce this impact as much as possible. itch.io was written with it and it compiles to vanilla Lua. The downside is it will incur a small performance impact every time a new page of callframes is allocated. Lua - Functions - TutorialsPoint Also, this page should explain that it is not possible to move a module to another namespace or vice versa, except doc pages (I think). I am trying to implement {{Horizontal timeline}} as a module. Lua is written in ANSI C, so it can compile almost everywhere. 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. An auto sizing callstack will allocate and release callstack pages on demand which will ensure the minimum amount of memory is in use at any time. It relies on Module:Sandbox/QuimGil/Flagicon, which provides the logics, and Module:Sandbox/QuimGil/FlagTranslations, where the flags data is stored.
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