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Calling Lua Functions - Game Dev Geek Everyone took really good care of our things. They both open a file, read one line, and close it, or do nothing if there was some error opening the file. ) Snipre (talk) 07:52, 31 October 2013 (UTC), Is there a LUA method for '#ifexist' that doesn't generate false incoming links? With those it's not entirely clear if they are meant to go together or not. And to fetch an argument without conversion the L.Get(n int) function can be used. The downside is it will incur a small performance impact every time a new page of callframes is allocated. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. WebThe Redis Lua execution context always provides a singleton instance of an object named redis . or compute and return values. The message from MediaWiki:Movepagetext-noredirectfixer should warn about this, perhaps a warning like MediaWiki:Moveuserpage-warning. The simplest way to time some Lua code is to use the time command with the resty command. 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. If you need a debugger, I recommend checking out. 2000 -DePiep (talk) 23:30, 19 July 2013 (UTC), Do Module:WikiLink and voy:ru::Wikilinks effectively aim to do the same thing? You couldn't keep track of your old experiments, and my experience is that yes, I. Objects implementing this interface are LNilType, LBool, LNumber, LString, LFunction, LUserData, LState, LTable, and LChannel. Automatic insertion of the green 'chrome' of our template documentation. I am trying to create a weblink by concatenating 2 strings and by avoiding the display of the full link in an infobox. a function definition has a conventional syntax; 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 simplest language I know. 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. "factorial: argument must be a number >= 0", -- likely something like 1=foo=bar, we need to do it as a named arg. Lua is a language with implicitly dynamic data types. The first question, of course, is whether we should require() at all. They have lots of options for moving. Makyen, does that look something like what you wanted? Check out this engine for making Zelda-likes for inspiration of how to write game code 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. 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/. OUR MISSION. What should I do to return a large text built from numerous smaller elements? Should I return a sequence of hundreds of strings relying on Scribunto in concatenating it? lua.LVIsFalse(v LValue) - Returns true if nil or false. Right now I'm putting ratings on the documentation subpages, which I think is what someone suggested before at one point for categories. This is not a tutorial or step-by-step guide. I've been trying to get to grips with the concept of frames, and I think I'm almost there. Wnt (talk) 15:52, 22 January 2014 (UTC), Wikipedia:Lua/To do, a page you substantially contributed to, has been nominated for deletion. To learn Lua, read Programming in Lua by Roberto Ierusalimschy. Requires all Lua files in a given directory. 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. mw.site.currentVersion, mw.site.scriptPath, etc etc. Now, with this new LUA language, template editing is becoming more and more the domain of technicians. Work fast with our official CLI. Writing code like this will become better with new #embed directive in future C/C++ versions, e.g. Page contents not supported in other languages. Many 3rd party Lua libraries usually work with Lua 5.2/5.3/5.4. If so, I can add Module:WikiLink to d:Q14746829. 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. Godoc: http://godoc.org/github.com/yuin/gopher-lua, All code in the post can be found at http://github.com/otm/embedding-lua-in-go. -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). A Go function should implement the LGFunction type to be callable from Lua. --Rotpunkt (talk) 12:35, 1 May 2013 (UTC), Hello, I'm wondering if there is currently a module that counts elements on a page. 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. 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. ", [ [\w+\. For instance, all library functions are written in C; GitHub - Samur3i/direct-loader: Requires all Lua files in a 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). 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. -Wikid77 (talk) 12:07, 24 March 2013 (UTC). The function signature must match what you passed in. Needs study to guarantee correctness! !) 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. In Chapter 16 we will discuss such calls Youre unlikely to run into performance issues, unless youre making a AA/AAA game or a complex simulation program. 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. ?0" here but useful if omit above. 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? What to write in C++: collision detection, path finding, physics, renderer and other things that are performance critical. 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. after imported i find error in article with this Category:Pages with script errors. how can i do this (on which module, i find this Category for translation). Thats basically all youll ever need to know about Lua. In this case we will embed Lua using gopher-lua. An expression like o:foo(x) and expressions in Lua. ]], "jo")' But there is a catch. Enrique Garca Cota has a lot of great articles about Lua: http://kiki.to/. It can do everything youd ever want from Lua and even more. 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. -Wikid77 (talk) 19:29, 22 March 2013 (UTC), When moving a module there is no redirect left behind and existing invocations should be fixed. And finally, see what LVE and PICO-8 do. Greetings Stephan Kulla (talk) 15:54, 19 May 2013 (UTC), (Sorry for writing here. That is partly about performance but mostly about engine architecture. These timings are likely different on different processor 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. If you're a Lua developer, please watchlist it. --Iantresman (talk) 14:50, 8 December 2013 (UTC). There are still a few things I'm not sure about, though. 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. 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. Lua doesnt impose one style of writing code on you. Technical 13 (talk) 12:12, 9 May 2013 (UTC). Page content can be retrieved with the getContent () method of the title object. 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. Vanilla Lua, the latest version, otherwise. However: This overhead may be trivial compared to what the body of What I'm trying to do is much more complicated, see Module:Convert/makeunits, but is the same issue. 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 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). *, 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. Please comment over there if you're interested. 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. We now have the /doc system somewhat integrated/forced trough the Scribunto extension. 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. L.DoString runs the Lua code in the VM. Link/Create testcases link for Module pages. 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 . Best Mr. Stradivarius talk 10:42, 27 March 2013 (UTC), You've got it pretty much right. 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. 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. It doesnt have many gotchas. also, if someone already wrote a module that does the same thing, let me know and I will have this one deleted. Just some of our awesome clients tat we had pleasure to work with. 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. 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 Still, there are a lot of options available maybe someone can think of something? That overhead might be removed if we made save/restore a built-in operation in Lua. It uses heavy meta-programming to get things done. 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! if u can help me)I imported Module:Citation, Module:Citation/CS1/Configuration, Module:Citation/CS1 in bn.wikipedia. For instance, all library functions are written in C; :) Wnt (talk) 08:16, 20 November 2013 (UTC), Can Lua take the contents of a Wiki page, and reprocess it? Its easy to integrate Lua scripts into C/C++ projects. I would generally recommend to avoid making high volume calls into Lua. 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). --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. So tonight I put together Module:Unsubst, which can be used to do the same thing without all the limitations of {{unsubst}}. 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. 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. . You can write entire games in Lua without ever touching C/C++. -- The parentheses remove the "number of changes" returned by gsub. Comments appreciated. Iterative multi-file loader, used to load all Lua modules in a directory and return them as one table. We could also use the template to automatically add Category:Lua-based templates to keep track of converted templates more easily. While still largely relevant for later versions, there are some differences.The fourth edition targets Lua 5.3 and is available at Amazon and other bookstores.By buying the book, you also help to support the Lua project. Thank you. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. However, sometimes that is just not enough and an embedded language can be the solution. These snippets of Python and Lua are roughly equivalent. try: with open("foo.txt") as f: The value of any of these keys will never be. Reinterpreting The Lua Interpreter | Hackaday 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. d Village Pump (policy)#Protection and management of scripts? The messages for /doc inclusion are currently added as contentlanguage, where really only their parameter should be included as such. The syntax of the template sends another template as parameter. I've created a new request page for Lua scripts at Wikipedia:Lua requests. 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. Hence, for Lua, the alternative is to pass fewer parameters, but as strings of choices delimited by separator characters within each string. 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). 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. My own modules populate only the pre-alpha and alpha categories, but there are some here which I know have reached the other levels. Is this the right place for Lua programming queries? Wnt (talk) 23:14, 21 March 2013 (UTC), I have run many timing tests, to compare using shell templates which contain #invoke versus direct use of {#invoke:}, and for tiny templates, such as string-handling functions, the template versions often ran upto 50% slower than direct #invoke of each tiny Lua function. 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. Toohool (talk) 18:13, 15 March 2013 (UTC). Download the official Lua source code here: https://www.lua.org/download.html. I've taken some steps to bring it partially in line with our Template documentation system. Otherwise false. The fact that even an IP user may edit the module namespace suggests that it must be really stable and secure. Can one call lua function that returns sevaral strings and pass them to a template? 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. 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. To get the perf bit 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. Ultimately MediaWiki should issue another tutorial for Wikipedians (without prior knowledge of C and Lua) due to the differences from standard Lua. Theyre mostly written in C/C++ and only expose a bunch of Lua functions/tables to the user. 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. It relies on Module:Sandbox/QuimGil/Flagicon, which provides the logics, and Module:Sandbox/QuimGil/FlagTranslations, where the flags data is stored. It has a GNU Make build, so building it is easy. 1 Answer Sorted by: 3 I would generally recommend to avoid making high volume calls into Lua. Calling JavaScript (At least script error should be shown when print function is detected.) 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. Any suggestion on how to receive this parameter template as a table rather than a substituted string? The typecheck function could also store away the type info for later introspection. Fantastic help. Toohool (talk) 17:18, 27 March 2013 (UTC), I have another related question. Johnuniq (talk) 06:53, 11 October 2013 (UTC), Doesn't Wikipedia's version of Lua allow the GetURL function (or equivalent)? Where I see this is commonly done is in the templates which return links to the archives of talk pages. Have there been any major incidents yet? For optional arguments the L.Opt(n int, default T) functions can be used. If that is not possible: Please suggest an alternative method to implement it. http://godoc.org/github.com/yuin/gopher-lua, http://github.com/otm/embedding-lua-in-go, http://godoc.org/github.com/yuin/gopher-lua#LTable. 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++. Installation You can download the latest release manually and include -DePiep (talk) 11:51, 22 March 2013 (UTC). Lua adjusts the number of arguments to the number of parameters, {{. Johnuniq (talk) 22:58, 10 January 2014 (UTC). See discussion at Village Pump (policy)#Protection and management of scripts?. 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. If you'd like to make a request, please do that too! Mr. Stradivarius talk 12:54, 10 July 2013 (UTC), We have {{WikiProject Lua/header}} that does the header tabs (I started). --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? That would only apply to your contributions though, not to later modifications made by other editors. Can someone make a nice SpecialPages adjustment? Programming in Lua : 5 that is, to call o.foo adding o as a first extra argument. The same can be said about making your program expandable with plugins. its number of parameters. --Iantresman (talk) 00:06, 12 December 2013 (UTC). The LState is needed for interacting with the Lua VM, most commonly for retrieving function arguments. Lua The function is followed by the arguments, in order. 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. Do I need to use %f and remove the trailing zeros with string.match or string.gsub? I'm a happy user of this space myself with the pet projects I develop in my free time. lua.LVAsBool(v LValue) - Convert to bool, nil and false becomes false. There was a problem preparing your codespace, please try again. Cya. Calling Lua code is done through L.CallByParam, which takes a parameters object, P, and arguments as variadic parameters. Iterative multi-file loader, used to load all Lua modules in a directory and return them as one table. Is there a way for a loadData table to contain these keys? = 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. 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. Our areas of expertise include Commercial Moving Services, Warehousing, Document Shredding and Storage Solutions. Anomie 03:36, 1 November 2013 (UTC), User:Wnt and I have had a little disagreement over the type parameter of the {{lua}} template. --Iantresman (talk) 11:31, 9 December 2013 (UTC), Can modules "call" other modules? to use Codespaces. -- Gets numbers for row1, row2, etc. WebIt's more terse, though at the expense of the function call overhead. Frietjes (talk) 16:17, 30 October 2013 (UTC). 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. is just another way to write o.foo(o, x), Updated link. See a simple example of how to build Lua with CMake and use it with sol2 here. 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. 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. 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. with nil arguments removed. You can call it with LuaJITs FFI, see the tutorial here. XLua Documentation - Taloncrossing --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? Please let me know your thoughts over at Template talk:Pagetype#Module:Pagetype. 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. What do people think? Much better! The price they quote you is guaranteed and if your load comes in on the scales below the pounds they quote you they will refund you the difference you paid. Wnt (talk) 15:56, 6 January 2014 (UTC). Stormworks Lua with LifeBoatAPI

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