Work fast with our official CLI. 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. is to create and maintain customer confidence with our services and communication. 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. Mr. Stradivarius talk 14:16, 4 November 2013 (UTC). 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. The function is followed by the arguments, in order. Command line parameters, environment variables, and configuration files are common ways to change the behavior of software. The redis instance enables the script to interact with the Redis server that's running Does someone have an idea how to code this feature? This is not a tutorial or step-by-step guide. lua Will your logo be here as well?. sign in I'm currently using the following function to get template arguments. WebThe Redis Lua execution context always provides a singleton instance of an object named redis . A Go function should implement the LGFunction type to be callable from Lua. 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. Updated link. You can divide up your code into separate functions. Hopefully this will be semi-useful again. Mr. Stradivarius talk 09:47, 11 November 2013 (UTC), I've updated Wikipedia:Lua/Modules/Overview using a Lua module to generate a table from various simple cut and paste data. Eg: {{example |row1 = {{template2|height=52}} }}, In the above exaple we can get row1 as frame.args.row1 but is it possible to get height from row1. --Rotpunkt (talk) 13:50, 9 January 2014 (UTC), mediawikiwiki:Extension talk:Scribunto/Lua reference manual #Example for string.format? One of the most versatile and used data structures in Lua is LTable (actually it is the only one). 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. to use Codespaces. I would use them again if needed. Snipre (talk) 07:52, 31 October 2013 (UTC), Is there a LUA method for '#ifexist' that doesn't generate false incoming links? I'd rather see useful LUA links. Its stable. Lori Baker - via Google. The docs are fantastic too. Isnt it great? I didn't use Special:ExpandTemplates, though - I really did just forget my curly braces. 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. Functions are the main mechanism for abstraction of statements :) Wnt (talk) 08:16, 20 November 2013 (UTC), Can Lua take the contents of a Wiki page, and reprocess it? --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. 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. Is there a programme wizard who can help see if I've done something stupid? Johnuniq (talk) 06:53, 11 October 2013 (UTC), Doesn't Wikipedia's version of Lua allow the GetURL function (or equivalent)? P:S Creating separate module for template2 in above example is not feasible because I am trying to reduce the number of template substitution and writing separate modules would defeat the purpose.--Jayarathina (talk) 05:20, 24 December 2013 (UTC). I get an error message when I use it. extra parameters get nil. 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. mw.site.currentVersion, mw.site.scriptPath, etc etc. I've created a new request page for Lua scripts at Wikipedia:Lua requests. 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). Lua doesnt impose one style of writing code on you. Village Pump (policy)#Protection and management of scripts? I see that I can access Mediawiki libraries as simple as "mw.stat", are modules on Wikipedia accessible as easily? The simplest language I know. 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. lua You can do procedural, functional, OO programming. 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). Text formatting (bold, italics) breaks when the ''/''' tags are not closed for each argument. If youre writing a game and want to make it possible for people to create mods, many of your players are likely to know Lua thanks to such games as Minecraft, Factorio, Garrys Mod, World of Warcraft, Roblox and. Since Lua has lexical scope at the block level rather than the function level, this works similarly to the way Python calls __exit__. its number of parameters. I don't think it was really a active decision. {\displaystyle d=3^{(n/2000)}.} 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)." If nothing happens, download Xcode and try again. 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. Similarly to the previous advice, when defining classes (e.g. 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. Otherwise true. Lua Local declaration of (built-in) Lua functions to reduce There is still lots of work to do of course, But it's a start TheDJ (talk contribs) 22:18, 18 March 2013 (UTC). !) 16:49, 3 April 2013 (UTC), I've created five categories for different levels of Lua module progress: since each explains the others, Category:Modules in alpha should be sufficient. with nil arguments removed. 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. 1 Answer Sorted by: 3 I would generally recommend to avoid making high volume calls into Lua. laura lehn - via Google, I highly recommend Mayflower. If you think that your game became slow because of Lua code, profile first before rewriting it in C++. Thank you. 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 Requires all Lua files in a given directory. However, in the example where SomeClass is returned as a local variable, you wont need to do this - if you just load the script.lua, it would execute some_class.lua when you call require (it would only do this if another script didnt call it, otherwise it would return a cached SomeClass variable). Thanks. --Iantresman (talk) 11:31, 9 December 2013 (UTC), Can modules "call" other modules? If you create a local object inside the coroutine and store the reference to it in C++. The message from MediaWiki:Movepagetext-noredirectfixer should warn about this, perhaps a warning like MediaWiki:Moveuserpage-warning. Lua adjusts the number of arguments to the number of parameters, 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? -- Sameboat - (talk) 07:07, 18 March 2013 (UTC), Thank Dragons flight for clearing something for me. If you'd like to make a request, please do that too! Otherwise empty string. --SocietyBox (talk) 02:26, 20 January 2014 (UTC). I did not see any mention of this in the tutorial.--greenrd (talk) 10:04, 19 October 2013 (UTC), I've started up a new discussion about this at Wikipedia talk:Lua style guide#CodeEditor switched to tabs. I measured the overhead of direct and virtual C++ function calls on the Xenon PowerPC some time ago. 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. --Iantresman (talk) 00:06, 12 December 2013 (UTC). I'd like to include some of the functionality of module:Page in my module, without having to reinvent the wheel. You signed in with another tab or window. 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. There are some practical functions to convert and check lua.LValue objects. I was going to deploy it on Template:Year in other calendars/testcases, but in my preview it runs out of time by the time it gets to the last test. WebWe can disable all the type checking by switching a single variable, and no added overhead would remain when the functions are executed (though there is some slight added overhead when the functions are built). (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? 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. I would generally recommend to avoid making high volume calls into Lua. ]], "jo")' But there is a catch. Given an instance myqobject of this class, a Lua program can emit signal mysignal as follows 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. 2015 Nils Lagerkvist. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. Immediately afterward it gives you another line of codes which I have absolutely no idea where to insert it to make it functional at all. The function signature must match what you passed in. WebBut when you create thou sands of small tables, the combined overhead can be signic ant. 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. The gopher-lua library operates on a interface called LValue. If that is not possible: Please suggest an alternative method to implement it. These functions does not throw errors, but will return Go default values if conversion is not possible. Please take a look at Module:RepeatString and Template talk:Repeat and see what you think. Then, executing script.lua would resullt in an error: SomeClass is nil. We now have the /doc system somewhat integrated/forced trough the Scribunto extension. I bypassed the most serious problem, but for some reason the method is generating incoming links to nonexisting articles. lua Does mw.ustring.byteoffset work correctly with negative offsets? / I think it really depends on the language and on the function. While the c and c++ compilers can inline a lot of functions, this is not the case fo The general method that has been used is to assume a format for the page archive name and then test for the existence of all such possible pages using {{#ifexist:}}. How do I fix this? Perhaps li in a list or tr in a table? 7.3 Hooks Ive used LuaDists CMake build scripts for Lua for many years, but LuaDist authors have stopped supporting newer Lua versions. Now the tab "Modules" does not show all modules, and does not have a 'next page' link. Lua Performance Tips The fact that even an IP user may edit the module namespace suggests that it must be really stable and secure. -DePiep (talk) 11:51, 22 March 2013 (UTC). Is this a problem in my module or in Scribunto? For example, I might want to process the posts on a talk page, and add some extra formatting. 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. 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? E.g. The problem with 3rd party bindings is that they usually tend to get unmaintained or only support a specific version of the library. -- The parentheses remove the "number of changes" returned by gsub. If you need a debugger, I recommend checking out. there is no difference between functions defined You choose what Lua code can and cant do. How you divide up your code among different Affects Lua, templates & parser functions: Again, the time-delay overhead, to pass thousands of parameters, not only affects the Lua #invoke interface, it extends the same exponential time-delay slowdown in passing parameters to templates as well as "|x=" branch-choices in a #switch function (which also runs 27 seconds to process 6,000 branches). Automatic insertion of the green 'chrome' of our template documentation. (At least script error should be shown when print function is detected.) 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. They are iteration functions, so they add the overhead of a function call to each loop iteration. functions Should I return a sequence of hundreds of strings relying on Scribunto in concatenating it? Everyone took really good care of our things. The system compares actual template output with fixed text, and is only suitable for templates and results that are reasonably short because each template and its expected result have to be in one line. (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. 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). This code is OK (calling C++ from Lua is cheap): This code is not that good (calling Lua from C++ is slow): Profile first. In the example bellow sayHello function is first defined, and then called in the second call to DoString. See http://godoc.org/github.com/yuin/gopher-lua#LTable for the LTable Go API. Also, your feedback here about the best way to organize the data is also welcome. Debresser (talk) 10:57, 8 December 2013 (UTC), Is the "Wikipedia namespaces" infobox necessary top right? Sorry if this was discussed before, but I did not find relevant links in a couple of minutes. -- Don't need the "%. lua.CanConvToString(v LValue) - True if LString or LNumber. 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. Passing just 1,000 parameters run about 1 second, and splitting 6,000 into 61,000 groups could process all 6,000 within 6 seconds, rather than 27. -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). d The Lua version has some differences from the current template, so I would like to get others' comments before making the switch. WebWhen iterating a table, the function overhead from ipairs does not justify it's use. 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). Example: L.GetTop() returns the number of arguments that was used when the function was called. 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! 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. Lua has eight basic types: nil (undefined) boolean (boolean) number (numeric) string (string) 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. Integrating it with CMake is somewhat trickier. Exposing Go functions to Lua is essential to create custom a custom API. In brief, the categories I set up were pre-alpha, alpha, beta, release, and protected. The downside is it will incur a small performance impact every time a new page of callframes is allocated. Can one call lua function that returns sevaral strings and pass them to a template? They have lots of options for moving. {{. 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. powered by Hugo 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. 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. Wnt (talk) 15:56, 6 January 2014 (UTC). 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 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). See the explanation on how to do concurrency in Lua in sol2 here (especially about lua_xmove and sol::main_object). Use Git or checkout with SVN using the web URL. You can call it with LuaJITs FFI, see the tutorial here. 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. 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. Please 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. What can I do to increase the performance of a Lua if u can help me)I imported Module:Citation, Module:Citation/CS1/Configuration, Module:Citation/CS1 in bn.wikipedia. or subroutine in other languages) Wikipedia talk:Lua/Archive 1 To learn Lua, read Programming in Lua by Roberto Ierusalimschy. Check out this engine for making Zelda-likes for inspiration of how to write game code in Lua. What am I doing wrong? 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. or compute and return values. The messages for /doc inclusion are currently added as contentlanguage, where really only their parameter should be included as such. 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. Also explains why the uselang=qqq hack doesn't work to show the scribunto messages. What to write in Lua: gameplay logic, FSMs, cutscenes, etc. 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? Is it a good idea to deviate from the template standard of calling pages with testcases, tests for the module namespace? 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. Can someone make a nice SpecialPages adjustment? Or is it something else? First lets set up the environment and test that it works, start by install gopher-lua: Secondly lets create a minimal implementation: lua.NewState() creates our Lua VM, and it is though L (*lua.LState) we will interact with Lua in the future. What is the equivalent of {{fullurl:page name}}? See the demos and more details at WikiProject Flag Template. The same can be said about making your program expandable with plugins. --Aftab1995 (talk) 15:50, 23 May 2013 (UTC), I'm very happy to announce that Template:FlagiconLua has reached feature parity with Template:Flagicon! 1 time resty -e '' We can see theres overhead of about 11 milliseconds on this machine. The value of any of these keys will never be. Calling the LValue.Type() returns the corresponding LValueType. Then, see if you really need to move this code (or parts of it) to C++. Timing Lua Code Correctly in OpenResty Then we call the function with lua_call (). Relevant to Lua, userscripts, and user scripting generally. L.DoString runs the Lua code in the VM. With those it's not entirely clear if they are meant to go together or not. Result #3 works correctly. 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). with nil arguments removed. Now, with this new LUA language, template editing is becoming more and more the domain of technicians. Much better! What should I do to return a large text built from numerous smaller elements? You can write entire games in Lua without ever touching C/C++. The LState is needed for interacting with the Lua VM, most commonly for retrieving function arguments. 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). Calling Lua code is done through L.CallByParam, which takes a parameters object, P, and arguments as variadic parameters. There are a number of To(n int) functions available. 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. Any suggestion on how to receive this parameter template as a table rather than a substituted string? --Iantresman (talk) 13:14, 8 December 2013 (UTC). Calling Lua Functions - Game Dev Geek In our C++ file, we need to define the consoleLog function that it will receive from JavaScript. You couldn't keep track of your old experiments, and my experience is that yes, I. See discussion at Village Pump (policy)#Protection and management of scripts?. in C (or in any other language used by the host application). 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. Ultimately MediaWiki should issue another tutorial for Wikipedians (without prior knowledge of C and Lua) due to the differences from standard Lua. 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). 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.
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