All rights reserved. Johnuniq (talk) 22:58, 10 January 2014 (UTC). 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). (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? These snippets of Python and Lua are roughly equivalent. The overhead of a virtual function call was 13.2 nanoseconds, or 42 clock cycles, compared to inline. The same can be said about making your program expandable with plugins. A Go function should implement the LGFunction type to be callable from Lua. Everyone took really good care of our things. For example, return {84 = 132}, or return {'84' = 132}, or return {0 = 00}, give errors demanding a } near the =. 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? WebIt's more terse, though at the expense of the function call overhead. There are still a few things I'm not sure about, though. It can do everything youd ever want from Lua and even more. Are you sure you want to create this branch? To get the perf bit Otherwise false. This is not a tutorial or step-by-step guide. That's a bit of boilerplate code that I've been using in all the modules I write. 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. Lua doesnt impose one style of writing code on you. 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). ], So templates can call Lua modules, parser functions and pages in MediaWiki namespace. Hex (? 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! Calling Lua code is done through L.CallByParam, which takes a parameters object, P, and arguments as variadic parameters. Debresser (talk) 10:57, 8 December 2013 (UTC), Is the "Wikipedia namespaces" infobox necessary top right? -- Sameboat - (talk) 07:07, 18 March 2013 (UTC), Thank Dragons flight for clearing something for me. How about expanding the template's function so that we can also put at the top of template /doc pages? 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. 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 It relies on Module:Sandbox/QuimGil/Flagicon, which provides the logics, and Module:Sandbox/QuimGil/FlagTranslations, where the flags data is stored. The process was smooth and easy. functions If this behavior is not suitable for your usecase, a custom handler function for resolving conflicting functions can be used by passing a function as an optional second argument. That is partly about performance but mostly about engine architecture. The messages for /doc inclusion are currently added as contentlanguage, where really only their parameter should be included as such. 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). if u can help me)I imported Module:Citation, Module:Citation/CS1/Configuration, Module:Citation/CS1 in bn.wikipedia. Much better! I would use them again if needed. Does someone have an idea how to code this feature? 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). WebLua scripts have the same capability with calling MMF events. Casey Moving Systems is family owned and has been servicing Northern California for over 25 years. :) Wnt (talk) 02:58, 6 January 2014 (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. You signed in with another tab or window. When calling a function, 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. How do I fix this? Also explains why the uselang=qqq hack doesn't work to show the scribunto messages. may be relevant to this problem. It stays global and doesnt get collected by a GC until it has been set to nil. Text formatting (bold, italics) breaks when the ''/''' tags are not closed for each argument. 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. It uses heavy meta-programming to get things done. 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. with nil arguments removed. 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 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). WebYou can call a template from a Lua module using frame:expandTemplate. 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. Best Mr. Stradivarius talk 10:42, 27 March 2013 (UTC), You've got it pretty much right. 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'. Stormworks Lua with LifeBoatAPI Please comment over there if you're interested. The approach of Module:Sandbox - having every user put scripts into a common receptacle - seems unworkable. Toohool (talk) 18:13, 15 March 2013 (UTC). I am trying to implement {{Horizontal timeline}} as a module. itch.io was written with it and it compiles to vanilla Lua. Calling Lua code is done through L.CallByParam, which takes a parameters object, P, and arguments as variadic parameters. 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. Similar to avoiding use of prior utility templates, when writing other utility templates, I would recommend to use the direct #invoke to access Lua functions from a utility template. The typecheck function could also store away the type info for later introspection. New versions come out once in a while, but you can comfortably stay on Lua 5.2 not loose much. 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? The resty command itself has a startup and exiting overhead. Frietjes (talk) 16:17, 30 October 2013 (UTC). The simplest language I know. Lua is written in ANSI C, so it can compile almost everywhere. I would have been able to continue contributing to these and other interesting templates. You can write entire games in Lua without ever touching C/C++. This came up over at Template talk:Historical populations. its hard to know if what youre passing to Lua will be copied or passed by a reference). Does mw.ustring.byteoffset work correctly with negative offsets? WebWhen iterating a table, the function overhead from ipairs does not justify it's use. Incnis Mrsi (talk) 22:46, 9 January 2014 (UTC). --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. Of course, the specific delay depends on server load, but follows the general exponential slowdown formula, where 7,000 parameters is far slower than a linear extension of 7000/6000 or 17% slower, and runs closer to 47 seconds (+70% slower) rather than 27+17%=31.6 seconds. I've created a new request page for Lua scripts at Wikipedia:Lua requests. A cross between resources, documentation, and useful links. :) Wnt (talk) 08:16, 20 November 2013 (UTC), Can Lua take the contents of a Wiki page, and reprocess it? If that is not possible: Please suggest an alternative method to implement it. 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. 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. The fact that even an IP user may edit the module namespace suggests that it must be really stable and secure. At Module:DisplayLuaTableContents I see numerous loops as, , but I learned that strings are immutable and hence this assignment is rather costly. For example, check Special:WhatLinksHere/3000 United States Census. 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. They are iteration functions, so they add the overhead of a function call to each loop iteration. Of course, you can check for this files existence and handle errors appropriately (e.g. Can templates, MediaWiki pages or parser functions be called from Lua? Calling JavaScript or subroutine in other languages) Automatic insertion of the green 'chrome' of our template documentation. Otherwise true. Can they be rewritten in Lua, perhaps? I didn't use Special:ExpandTemplates, though - I really did just forget my curly braces. It would be a bit odd. 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. 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. Currently it is misleading advising to check for double redirects. See a simple example of how to build Lua with CMake and use it with sol2 here. 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. Can Lua scripts access the username of the logged in user? In the first case, we use a function call as a statement; If you only want to call some C/C++ functions from Lua (or some small Lua functions from C/C++) - use Lua C API. I get an error message when I use it. !) 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. I'm currently using the following function to get template arguments. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. Please Ive used LuaDists CMake build scripts for Lua for many years, but LuaDist authors have stopped supporting newer Lua versions. 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. The syntax of the template sends another template as parameter. Please take a look at Module:RepeatString and Template talk:Repeat and see what you think. Writing the code in it feels like writing pseudocode/prototyping. WebThe Redis Lua execution context always provides a singleton instance of an object named redis . 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. I was just trying to return those hex tables via loadData and seem to have run into a nasty surprise. -DePiep (talk) 11:51, 22 March 2013 (UTC). There are some practical functions to convert and check lua.LValue objects. Is there a way to obtain a list (array) of all pages with a prefix (e.g. 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. Check out this engine for making Zelda-likes for inspiration of how to write game code in Lua. Lua lua !) 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. : Overusing them makes code harder to understand because now you need to make sure that the object youre are pointing to doesnt change unexpectedly. If you'd like to make a request, please do that too! 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. You can divide up your code into separate functions. 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. with nil arguments removed. 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. It Is Me Here t / c 15:08, 3 September 2013 (UTC). With your own bindings, you can control what version you use and how the exposed API looks in Lua. Will your logo be here as well?. For variety, and to match the fact that if you know what values you are dealing with you might have some "ifthenelse" statements to handle them, I did the format slightly differently. You can call a function with a number of arguments different from Comments appreciated. 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. 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. It has a GNU Make build, so building it is easy. Hard working, fast, and worth every penny! This will make your life easier, because you would be able to write less binding code and be able to stay inside Lua code as much as possible. Then, see if you really need to move this code (or parts of it) to C++. Vanilla Lua, the latest version, otherwise. Mr. Stradivarius talk 14:16, 4 November 2013 (UTC). Hence, for Lua, the alternative is to pass fewer parameters, but as strings of choices delimited by separator characters within each string. 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)." thank you. I'd like to include some of the functionality of module:Page in my module, without having to reinvent the wheel. How much do function calls impact performance? If you create a local object inside the coroutine and store the reference to it in C++. However, the basic API is quite simple, and the advanced features deserves its own post. Programming in Lua : 5 -Wikid77 (talk) 19:29, 22 March 2013 (UTC), When moving a module there is no redirect left behind and existing invocations should be fixed. [feature X] (images/feature-x.png) Multi-MC Simulation Makyen (talk) 05:58, 1 January 2014 (UTC), That makes sense. In our C++ file, we need to define the consoleLog function that it will receive from JavaScript. 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). Wnt (talk) 15:52, 22 January 2014 (UTC), Wikipedia:Lua/To do, a page you substantially contributed to, has been nominated for deletion. 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. -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). Now you dont need to ship this init.lua with your binary and life becomes easier. Right now I'm putting ratings on the documentation subpages, which I think is what someone suggested before at one point for categories. Older versions of Lua created empty tables with some pre-all ocated slots (four, if I Hex (? now i wanted to translate Category:Pages with script errors in bn language. These timings are likely different on different processor Page content can be retrieved with the getContent () method of the title object. 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. I don't know, but with some of these things being transcluded on every page in the wiki, and having elaborate powers to write anything they can slip by the interface, we should be wary of security holes, and the first step is to know quickly and certainly which are a unit, I think. (At least script error should be shown when print function is detected.) 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. Embedding Lua in Go To learn Lua, read Programming in Lua by Roberto Ierusalimschy. in the second case, we use it as an expression: Lua also offers a special syntax for object-oriented calls, A tag already exists with the provided branch name. And finally, see what LVE and PICO-8 do. Think of Lua scripts as functions - you can call them with require or do_file and they can return variables. We are proud to provide our customers with these services and value by trained professionals. Also, your feedback here about the best way to organize the data is also welcome. Do I need to use %f and remove the trailing zeros with string.match or string.gsub? Can someone make a nice SpecialPages adjustment? Iterative multi-file loader, used to load all Lua modules in a directory and return them as one table. Is a module supposed to do something clever in order to output tags? The sandbox Wiki code {{Special:AllPages|namespace=666}} {{CURRENTTIMESTAMP}} returns a timestamp that changes each time the page is reloaded, because caching is disabled. (and object-oriented programming) in more detail. Calling the LValue.Type() returns the corresponding LValueType. What to write in Lua: gameplay logic, FSMs, cutscenes, etc. Most of the time, you only need one Lua state (lua_State in Lua C API and sol::state in sol2) for everything. Lua Lua Performance Tips 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). Have there been any major incidents yet? -Wikid77 (talk) 12:07, 24 March 2013 (UTC). 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). E.g. You can even create small domain specific languages thanks to Luas syntax sugar. Now the tab "Modules" does not show all modules, and does not have a 'next page' link. -- Gets numbers for row1, row2, etc. ), You dont need a specialized IDE or tools to write Lua comfortably. 2015 Nils Lagerkvist. You can do procedural, functional, OO programming. 1 Answer Sorted by: 3 I would generally recommend to avoid making high volume calls into Lua. Updated link. Thats basically all youll ever need to know about Lua. 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. 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. --SocietyBox (talk) 02:26, 20 January 2014 (UTC). Installation You can download the latest release manually and include A very simple test is: Result #2 is brokenthe first line includes a working wikilink (should not happen inside pre, but would happen if had a single space at the beginning of the line, with no pre). Extra arguments are thrown away; I'm a happy user of this space myself with the pet projects I develop in my free time. They both open a file, read one line, and close it, or do nothing if there was some error opening the file. I am a repeat customer and have had two good experiences with them. 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. Timing Lua Code Correctly in OpenResty Similarly to the previous advice, when defining classes (e.g. Each layer of "shell templates" (to #invoke a Lua function) also increases the expansion depth by about +2 levels of the 41-level limit (shows "41/40"). Servicing Stanislaus, San Joaquin and Merced Counties, 2209 Fairview Drive Suite A Ceres, CA 95307. Download the official Lua source code here: https://www.lua.org/download.html. sign in --Iantresman (talk) 14:50, 8 December 2013 (UTC). Easy to start using, the interface is user friendly and feels similar to C++ standard library. The first question, of course, is whether we should require() at all. lua What am I doing wrong? (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. The less data is shared between C++ and Lua, the better. If you need a debugger, I recommend checking out. Needs study to guarantee correctness! Lua 5.4 The value of any of these keys will never be. 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? Its much easier to test if something is non-nil or has a specific type/fields in Lua than in C++. Local declaration of (built-in) Lua functions to reduce I used their packing and moving service the first time and the second time I packed everything and they moved it. lua.CanConvToString(v LValue) - True if LString or LNumber. Reinterpreting The Lua Interpreter | Hackaday Thanks! 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. 1 time resty -e '' We can see theres overhead of about 11 milliseconds on this machine. The documentation toolbox does not yet know about Module testcases (though the editnotice 'sort of' does). 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). in Lua and functions defined in C. As we have seen in other examples, There is no reason to do it for functions which are already Preceding unsigned comment added by Ryn78 (talk contribs) 03:27, 13 October 2013 (UTC), Is it possible for a module to invoke another module? = See discussion at Village Pump (policy)#Protection and management of scripts?. In brief, the categories I set up were pre-alpha, alpha, beta, release, and protected. My initial thought is that having a module named after a single string function may be a bit extravagant, so perhaps it would be better grouped with other similar functions, if those exist somewhere. All values in Lua can be stored in variables, used as arguments when calling functions, and returned as the result of their execution. And to fetch an argument without conversion the L.Get(n int) function can be used. 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. Please let me know your thoughts over at Template talk:Pagetype#Module:Pagetype. Result #3 works correctly. Use Git or checkout with SVN using the web URL. At least one such template will be beyond the 500 EPFs/page limit in 2015. Thanks. What can I do to increase the performance of a Lua Its minimalistic, but requires a lot of boilerplate and manual error-checking. The function is followed by the arguments, in order. I don't think it was really a active decision. This was possible because the wikimarkup language was very intuitive, and easy to understand even for the layman. XLua Documentation - Taloncrossing Writing code like this will become better with new #embed directive in future C/C++ versions, e.g. 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. Please take a look, critique it, test it, and let me know if there is anything that should change before I look at deploying it to some of the maintenance templates. This bytecode is converted into LLVM IR and then fed into Deegen, which can transform the functions to do tail calls correctly, use the GHC calling conventions, and a The LTable type can be used for emulating namespaces and classes. Your life will be easier if you have a small C/C++ API. For instance, all library functions are written in C; A language variable can contain values of any type.
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