Example: L.GetTop() returns the number of arguments that was used when the function was called. Thank you. 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. :P Anyway, I have taken that idea and added some parameter checking and some documentation, and called it Module:User:Mr. Stradivarius/PrefixIndex. How do I fix this? If you need a debugger, I recommend checking out. In our C++ file, we need to define the consoleLog function that it will receive from JavaScript. Anyone interested in testing templates may want to try Module:Convert/tester which allows hundreds of tests to be easily defined. 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. I very much regret that. Is it a good idea to deviate from the template standard of calling pages with testcases, tests for the module namespace? 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. I just quickly sorted out the present Lua modules to Wikipedia:Lua/Modules/Overview. 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. --Iantresman (talk) 13:14, 8 December 2013 (UTC). All rights reserved. I measured the overhead of direct and virtual C++ function calls on the Xenon PowerPC some time ago. -- Sameboat - (talk) 07:07, 18 March 2013 (UTC), Thank Dragons flight for clearing something for me. 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. If that is not possible: Please suggest an alternative method to implement it. 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). Writing the code in it feels like writing pseudocode/prototyping. ( Instead of requiring Module:Redirect from a protected module (or in this case a template, Template:Submit an edit request, which serves MediaWiki:Protectedpagetext), you would simply require or link to a copy (Module:Submit an edit request/Redirect). I would use them again if needed. 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. in C (or in any other language used by the host application). 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. Thank you!--QuimGil (talk) 07:52, 21 June 2013 (UTC). 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. Hex (? My own modules populate only the pre-alpha and alpha categories, but there are some here which I know have reached the other levels. The returned integer defines how many return values has been pushed to the Lua stack. These functions does not throw errors, but will return Go default values if conversion is not possible. 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. L.DoString runs the Lua code in the VM. Best Mr. Stradivarius talk 10:42, 27 March 2013 (UTC), You've got it pretty much right. 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? itch.io was written with it and it compiles to vanilla Lua. -- Sameboat - (talk) 04:26, 19 March 2013 (UTC). Its easy to integrate Lua scripts into C/C++ projects. Incnis Mrsi (talk) 22:46, 9 January 2014 (UTC). For example, check Special:WhatLinksHere/3000 United States Census. WebLua scripts have the same capability with calling MMF events. 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. Calling JavaScript I would generally recommend to avoid making high volume calls into Lua. You can divide up your code into separate functions. --Rotpunkt (talk) 12:35, 1 May 2013 (UTC), Hello, I'm wondering if there is currently a module that counts elements on a page. 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. We now have the /doc system somewhat integrated/forced trough the Scribunto extension. 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 call a function with a number of arguments different from It uses heavy meta-programming to get things done. 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). Greetings Stephan Kulla (talk) 15:54, 19 May 2013 (UTC), (Sorry for writing here. Can templates, MediaWiki pages or parser functions be called from Lua? This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. An expression like o:foo(x) The process was smooth and easy. 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.LVIsFalse(v LValue) - Returns true if nil or false. Wnt (talk) 15:56, 6 January 2014 (UTC). What am I doing wrong? Frietjes (talk) 16:17, 30 October 2013 (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. WebWhen iterating a table, the function overhead from ipairs does not justify it's use. 7.3 Hooks A cross between resources, documentation, and useful links. A Go function should implement the LGFunction type to be callable from Lua. 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. The simplest language I know. 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. Theyre mostly written in C/C++ and only expose a bunch of Lua functions/tables to the user. How much do function calls impact performance? *, 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. 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}}. Integrating it with CMake is somewhat trickier. The documentation toolbox does not yet know about Module testcases (though the editnotice 'sort of' does). ", [ [\w+\. -- Gets numbers for row1, row2, etc. Currently it is misleading advising to check for double redirects. Mr. Stradivarius talk 23:06, 1 January 2014 (UTC); Page moved without redirect. Makyen, does that look something like what you wanted? Isnt it great? . See discussion at Village Pump (policy)#Protection and management of scripts?. Fantastic help. The second clause supports a simple way to invoke the function from another module (such as from Module:Navbox), or from the debug console: Navbar.navbar({arg1 = 'foo', arg2 = 'bar'});. The resty command itself has a startup and exiting overhead. Download the official Lua source code here: https://www.lua.org/download.html. Please let me know your thoughts over at Template talk:Pagetype#Module:Pagetype. However, the basic API is quite simple, and the advanced features deserves its own post. These timings are likely different on different processor 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). You signed in with another tab or window. also, if someone already wrote a module that does the same thing, let me know and I will have this one deleted. Stormworks Lua with LifeBoatAPI Older versions of Lua created empty tables with some pre-all ocated slots (four, if I 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. 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. One of the most versatile and used data structures in Lua is LTable (actually it is the only one). It would be a bit odd. to use Codespaces. Automatic insertion of the green 'chrome' of our template documentation. You can find Luas reference manual here. lua is to create and maintain customer confidence with our services and communication. or compute and return values. its hard to know if what youre passing to Lua will be copied or passed by a reference). for example, make this work without copying the args to a new table? Automatic transclusion of protection templates was added. Because it makes it much easier to track dependencies between various script files and makes them load each other when theyre needed. Then, executing script.lua would resullt in an error: SomeClass is nil. 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. 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 XLua object also has a substantial MMF Interface for directly querying and modifying game objects and state 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. The parameters object takes three important parameters: The following code defines a concat function in Lua. See a simple example of how to build Lua with CMake and use it with sol2 here. Servicing Northern California For Over 25 Years, Select The Service Your Interested InDocument ShreddingRecords ManagementPortable StorageMoving ServicesSelf StorageOffice MovingMoving Supplies. or subroutine in other languages) While running tests to simulate a large #switch function of 3,000 branches, I repeatedly confirmed how passing thousands of parameters is typically exponentially slower beyond the first 500 parameters. 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. That is partly about performance but mostly about engine architecture. Sandboxing is easy. The sandbox Wiki code {{Special:AllPages|namespace=666}} {{CURRENTTIMESTAMP}} returns a timestamp that changes each time the page is reloaded, because caching is disabled. 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. Check out this engine for making Zelda-likes for inspiration of how to write game code in Lua. At the moment, we have three patterns in naming a module sandbox page: I suggest that is one too much. Also explains why the uselang=qqq hack doesn't work to show the scribunto messages. The LTable type can be used for emulating namespaces and classes. laura lehn - via Google, I highly recommend Mayflower. ]], "jo")' But there is a catch. A fixed size callstack has the highest performance and has a fixed memory overhead. there is no difference between functions defined You might also find Moonscript interesting. 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 Of course, you can check for this files existence and handle errors appropriately (e.g. now i wanted to translate Category:Pages with script errors in bn language. Similarly to the previous advice, when defining classes (e.g. for instance, Parameters work exactly as local variables, 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. 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. NeoVim, which uses Lua scripts for user script code. sol2 is a fantastic library which Ive used for many years. --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. 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. 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. with nil arguments removed. Ginsuloft (talk) 13:39, 30 October 2013 (UTC), currently, in Module:Historical populations, I am using a somewhat convoluted method to access 'formatnum' which involves passing 'frame' and using 'callParserFunction'. Thats basically all youll ever need to know about Lua. 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. That overhead might be removed if we made save/restore a built-in operation in Lua. Or is it something else? OUR MISSION. Command line parameters, environment variables, and configuration files are common ways to change the behavior of software. The LState is needed for interacting with the Lua VM, most commonly for retrieving function arguments. Is a module supposed to do something clever in order to output tags? If you'd like to make a request, please do that too! !) 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. Ultimately MediaWiki should issue another tutorial for Wikipedians (without prior knowledge of C and Lua) due to the differences from standard Lua. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Dont put too much code into one script - its easy to separate everything into smaller scripts. Still, there are a lot of options available maybe someone can think of something? Most of the time, you only need one Lua state (lua_State in Lua C API and sol::state in sol2) for everything. -- Gets args.rowtype1, args.rowtype2, etc. 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.