The simplest language I know. (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. That is partly about performance but mostly about engine architecture. I am a repeat customer and have had two good experiences with them. --Iantresman (talk) 13:14, 8 December 2013 (UTC). What to write in Lua: gameplay logic, FSMs, cutscenes, etc. ", [ [\w+\. 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. Thank you!--QuimGil (talk) 07:52, 21 June 2013 (UTC). Should I return a sequence of hundreds of strings relying on Scribunto in concatenating it? Then we call the function with lua_call (). 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 ! Does mw.ustring.byteoffset work correctly with negative offsets? Is there a way to obtain a list (array) of all pages with a prefix (e.g. Perhaps li in a list or tr in a table? Is this the right place for Lua programming queries? You can even create small domain specific languages thanks to Luas syntax sugar. 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 . The docs are fantastic too. Mr. Stradivarius talk 01:15, 29 October 2013 (UTC), How well does Scribunto defend itself against DoS, or possibly XSS, but especially DoS as we are dealing with a Turing-complete language? a function definition has a conventional syntax; Hence, for Lua, the alternative is to pass fewer parameters, but as strings of choices delimited by separator characters within each string. Thats basically all youll ever need to know about Lua. -- Sameboat - (talk) 04:26, 19 March 2013 (UTC). I would use them again if needed. 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'});. There are some practical functions to convert and check lua.LValue objects. :) Wnt (talk) 02:58, 6 January 2014 (UTC). Technical 13 (talk) 12:12, 9 May 2013 (UTC). What should I do to return a large text built from numerous smaller elements? 2000 If that is not possible: Please suggest an alternative method to implement it. I think that this is less effective than it could be, however. 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. ( L.DoString runs the Lua code in the VM. Enrique Garca Cota has a lot of great articles about Lua: http://kiki.to/. Calling Lua code is done through L.CallByParam, which takes a parameters object, P, and arguments as variadic parameters. This came up over at Template talk:Historical populations. This concept might be extended to support more than one memory location: Is this a problem in my module or in Scribunto? Please comment over there if you're interested. 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. 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. For example, Module:Navbar contains the code: In what case would frame not be equal to mw.getCurrentFrame()? After the function call, functions It may sound like asking to be babysat or spoon-fed, but I'm totally stuck. Older versions of Lua created empty tables with some pre-all ocated slots (four, if I Thank you. Are you sure you want to create this branch? 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. --Aftab1995 (talk) 15:50, 23 May 2013 (UTC), I'm very happy to announce that Template:FlagiconLua has reached feature parity with Template:Flagicon! I was just trying to return those hex tables via loadData and seem to have run into a nasty surprise. Thanks. Your life will be easier if you have a small C/C++ API. The function signature must match what you passed in. How much do function calls impact performance? Johnuniq (talk) 22:58, 10 January 2014 (UTC). WebLua Functions - A function is a group of statements that together perform a task. I would generally recommend to avoid making high volume calls into Lua. 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. Isnt it great? --Iantresman (talk) 11:31, 9 December 2013 (UTC), Can modules "call" other modules? is just another way to write o.foo(o, x), Similarly to the previous advice, when defining classes (e.g. Still, there are a lot of options available maybe someone can think of something? Yes, you can replace built-in functions because they are simply functions accessed from global variables. I very much regret that. At the moment, we have three patterns in naming a module sandbox page: I suggest that is one too much. Its minimalistic, but requires a lot of boilerplate and manual error-checking. Please take a look at Module:RepeatString and Template talk:Repeat and see what you think. Just some of our awesome clients tat we had pleasure to work with. Lua Performance Tips Otherwise true. Formula: 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. Since Lua has lexical scope at the block level rather than the function level, this works similarly to the way Python calls __exit__. = there is no difference between functions defined 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/. is to create and maintain customer confidence with our services and communication. Sandboxing is easy. Timing Lua Code Correctly in OpenResty Although Lua can still process the 6,000 parameters, to compare choices, within "0.02" Lua seconds, the load time of the #invoke interface is 27 seconds. See a simple example of how to build Lua with CMake and use it with sol2 here. -DePiep (talk) 11:51, 22 March 2013 (UTC). 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. Its much easier to test if something is non-nil or has a specific type/fields in Lua than in C++. 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. For example, Module:User:Mr. Stradivarius/sandbox2 produces the right result when used via invoke from User:Mr. Stradivarius/Sandbox, but when I use the code = p.test() in the debug console I get the error "Lua error at line 4: attempt to index local 'frame' (a nil value)." It is superfluous if you only call the function once within the scope of the local variable, but that is pretty rare. The Lua version has some differences from the current template, so I would like to get others' comments before making the switch. --Iantresman (talk) 14:50, 8 December 2013 (UTC). Lua is a language with implicitly dynamic data types. I measured the overhead of direct and virtual C++ function calls on the Xenon PowerPC some time ago. *, 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. Redis Lua API reference | Redis It Is Me Here t / c 15:08, 3 September 2013 (UTC). Unfortunately, I have not yet been able to think of a way to mix this logic to get what I want, namely a way to control whether results are updated daily or weekly, etc., because I haven't thought of a way by which the logic of whether time has passed will always be evaluated but the logic of the page content will not be, unless the time has come, at which point the caching should be updated on that page. 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. with nil arguments removed. thank you. In the example bellow sayHello function is first defined, and then called in the second call to DoString. If so, I can add Module:WikiLink to d:Q14746829. Basically, you need to tell Lua explicitly that something youve created in the coroutine needs to outlive this coroutine (and this is done with lua_xmove). 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. 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. Theyre mostly written in C/C++ and only expose a bunch of Lua functions/tables to the user. Lua Writing the code in it feels like writing pseudocode/prototyping. Lua doesnt impose one style of writing code on you. Calling JavaScript These functions does not throw errors, but will return Go default values if conversion is not possible. n 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. OUR MISSION. If you need a debugger, I recommend checking out. It would be much faster to pass a single parameter, as a single string of delimited choices, alternating with resultant values, rather than try to pass 3,000 choices as 6,000 parameters, which has been running about 27 seconds in the parser. However, the basic API is quite simple, and the advanced features deserves its own post. 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. 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. 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. How to implement action sequences and cutscenes in Lua, Making and storing references to game objects (entities) in C++ and Lua, https://www.lua.org/manual/5.4/manual.html#4. -- Gets numbers for row1, row2, etc. that is, to call o.foo adding o as a first extra argument. ], So templates can call Lua modules, parser functions and pages in MediaWiki namespace. Also, your feedback here about the best way to organize the data is also welcome. And finally, see what LVE and PICO-8 do. Many 3rd party Lua libraries usually work with Lua 5.2/5.3/5.4. There is no reason to do it for functions which are already The approach of Module:Sandbox - having every user put scripts into a common receptacle - seems unworkable. thank you. 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. Then, executing script.lua would resullt in an error: SomeClass is nil. 2015 Nils Lagerkvist. Is there a programme wizard who can help see if I've done something stupid? 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. See discussion at Village Pump (policy)#Protection and management of scripts?. It uses heavy meta-programming to get things done. 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). with nil arguments removed. What is the equivalent of {{fullurl:page name}}? {{. What to write in C++: collision detection, path finding, physics, renderer and other things that are performance critical. 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. Dont put too much code into one script - its easy to separate everything into smaller scripts. One of the most versatile and used data structures in Lua is LTable (actually it is the only one). If you only want to call some C/C++ functions from Lua (or some small Lua functions from C/C++) - use Lua C API. However, I found that returning mw.message.newRawMessage("{{User:Wnt/Templates/Sandbox2}}"):parse() produces a timestamp that never changes when the page invoking the module is reloaded, because the page transcluded is not checked at all. Often the linked module contains bells and whistles that aren't really necessary; why not bring it into the module and slim it down? Calling Lua Functions - Game Dev Geek 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}}. Otherwise empty string. It can do everything youd ever want from Lua and even more. 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. Now, with this new LUA language, template editing is becoming more and more the domain of technicians. Page content can be retrieved with the getContent () method of the title object. if u can help me)I imported Module:Citation, Module:Citation/CS1/Configuration, Module:Citation/CS1 in bn.wikipedia. 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. 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. The functions in question had a single parame Otherwise false. The first question, of course, is whether we should require() at all. 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? You can divide up your code into separate functions. I've taken some steps to bring it partially in line with our Template documentation system. The message from MediaWiki:Movepagetext-noredirectfixer should warn about this, perhaps a warning like MediaWiki:Moveuserpage-warning. Stormworks Lua with LifeBoatAPI Automatic transclusion of protection templates was added. I tried to start learning Lua and immediately hit the wall after the "hello, world" part and all I got afterward are "script error". Example: L.GetTop() returns the number of arguments that was used when the function was called. 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. If nothing happens, download GitHub Desktop and try again. 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. If you think that your game became slow because of Lua code, profile first before rewriting it in C++. For example (C++ functions have cpp postfix): Ask yourself: do all these functions need to be in C++? 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. WebBut when you create thou sands of small tables, the combined overhead can be signic ant. Comments appreciated. after imported i find error in article with this Category:Pages with script errors. Can do a lot of automagic and save you from writing tons of boilerplate code, which you need to do if you use other bindings or Lua C API. initialized with the actual arguments given in the function call. 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. I get an error message when I use it. Learn more. Extra arguments are thrown away; 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. Download the official Lua source code here: https://www.lua.org/download.html. I am trying to create a weblink by concatenating 2 strings and by avoiding the display of the full link in an infobox. laura lehn - via Google, I highly recommend Mayflower. Iterative multi-file loader, used to load all Lua modules in a directory and return them as one table. 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. Hard working, fast, and worth every penny! WebFunctions used by a Lua program can be defined both in Lua and in C (or in any other language used by the host application). Hex (? lua A tag already exists with the provided branch name. I'd like to include some of the functionality of module:Page in my module, without having to reinvent the wheel. by displaying a message box/writing to a log), but if your init.lua is not meant to be modified externally, maybe you can do it like this? (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? -Wikid77 (talk) 19:29, 22 March 2013 (UTC), When moving a module there is no redirect left behind and existing invocations should be fixed. This doesn't, which I was hoping would be equivalent: And, how do I do the reverse, and convert mw.site.currentVersion to the string "mw.site.currentVersion"? It stays global and doesnt get collected by a GC until it has been set to nil. The XLua object also has a substantial MMF Interface for directly querying and modifying game objects and state WebYou can call a template from a Lua module using frame:expandTemplate. The downside is it will incur a small performance impact every time a new page of callframes is allocated. Providing global relocations solutions, storage and warehousing platforms and destruction plans. Lua is written in ANSI C, so it can compile almost everywhere. See the demos and more details at WikiProject Flag Template. 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. They have lots of options for moving. Can Lua scripts access the username of the logged in user? 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. It behaves somewhat like a stack as in [Forth] but with one element. We could also use the template to automatically add Category:Lua-based templates to keep track of converted templates more easily. --Iantresman (talk) 14:56, 12 December 2013 (UTC), --Iantresman (talk) 09:36, 13 December 2013 (UTC), Does our implementation allow Lua scripts access to whether the user is logged in or not? I didn't use Special:ExpandTemplates, though - I really did just forget my curly braces. Integrating it with CMake is somewhat trickier. 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). Toohool (talk) 17:18, 27 March 2013 (UTC), I have another related question. If you'd like to make a request, please do that too! 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. 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. You can call a function with a number of arguments different from I'd rather see useful LUA links. Functions used by a Lua program can be defined both in Lua and as it does in a multiple assignment: lua.LVIsFalse(v LValue) - Returns true if nil or false. The typecheck function could also store away the type info for later introspection. E.g. in Lua and functions defined in C. As we have seen in other examples,