It is also possible to make the function a parameter if it comes from a defined list of choices - just load up your data and set a loop that p[xyz] = function(frame) return p.main(frame, xyz) end. Thank you. 1 Answer Sorted by: 3 I would generally recommend to avoid making high volume calls into Lua. The process was smooth and easy. also, if someone already wrote a module that does the same thing, let me know and I will have this one deleted. How about expanding the template's function so that we can also put at the top of template /doc pages? 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. Lori Baker - via Google. laura lehn - via Google, I highly recommend Mayflower.,, etc etc. 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. powered by Hugo For instance, all library functions are written in C; Also explains why the uselang=qqq hack doesn't work to show the scribunto messages. 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. And to fetch an argument without conversion the L.Get(n int) function can be used. 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? Thats basically all youll ever need to know about Lua. If you're unaware, {{unsubst}} (along with a few other templates) is used to make it so that entering {{subst:citation needed}} in an article results in {{Citation needed| date=November 2013}} rather than dumping all the template code into the article. The parameters object takes three important parameters: The following code defines a concat function in Lua. Its neat. Link/Create testcases link for Module pages. Even if you do, with LuaJIT youll be able to achieve C/C++ level performance. However, the basic API is quite simple, and the advanced features deserves its own post. Gut feeling is usually wrong. : Overusing them makes code harder to understand because now you need to make sure that the object youre are pointing to doesnt change unexpectedly. Does this apply if you are accessing the module from another Lua module, and not directly from a wiki page? Please don't take those *personal* suggestions as a criticism to Wikipedia:Lua. The problem with 3rd party bindings is that they usually tend to get unmaintained or only support a specific version of the library. 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. Many 3rd party Lua libraries usually work with Lua 5.2/5.3/5.4. In our C++ file, we need to define the consoleLog function that it will receive from JavaScript. You can do procedural, functional, OO programming. However: This overhead may be trivial compared to what the body of The first clause supports the case where the module is being invoked from a template as {{#invoke: Navbar | navbar}}. See the demos and more details at WikiProject Flag Template. The typecheck function could also store away the type info for later introspection. Functions used by a Lua program can be defined both in Lua and 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. It has a GNU Make build, so building it is easy. Comments appreciated. 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. Iterative multi-file loader, used to load all Lua modules in a directory and return them as one table. Dont put too much code into one script - its easy to separate everything into smaller scripts. Mr. Stradivarius talk 12:54, 10 July 2013 (UTC), We have {{WikiProject Lua/header}} that does the header tabs (I started). How to implement action sequences and cutscenes in Lua, Making and storing references to game objects (entities) in C++ and Lua, -- Sameboat - (talk) 07:07, 18 March 2013 (UTC), Thank Dragons flight for clearing something for me. -- Sameboat - (talk) 04:26, 19 March 2013 (UTC). You can even create small domain specific languages thanks to Luas syntax sugar. Needs study to guarantee correctness! If nothing happens, download Xcode and try again. Fantastic help. Is a module supposed to do something clever in order to output tags? Can they be rewritten in Lua, perhaps? For optional arguments the L.Opt(n int, default T) functions can be used. extra parameters get nil. 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. Lua has eight basic types: nil (undefined) boolean (boolean) number (numeric) string (string) (At least script error should be shown when print function is detected.) All rights reserved. There are some practical functions to convert and check lua.LValue objects. With those it's not entirely clear if they are meant to go together or not. after imported i find error in article with this Category:Pages with script errors. 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. . Much better! Everyone took really good care of our things. Please comment over there if you're interested. Its much easier to test if something is non-nil or has a specific type/fields in Lua than in C++. 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). -DePiep (talk) 11:51, 22 March 2013 (UTC). Wnt (talk) 15:56, 6 January 2014 (UTC). This makes dependencies between files hard to track and require you to manually execute some_class.lua before you can execute script.lua. 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 bypassed the most serious problem, but for some reason the method is generating incoming links to nonexisting articles. Can Lua scripts access the username of the logged in user? The less data is shared between C++ and Lua, the better. Providing global relocations solutions, storage and warehousing platforms and destruction plans. 3 I used their packing and moving service the first time and the second time I packed everything and they moved it. Easy to start using, the interface is user friendly and feels similar to C++ standard library. 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 just another way to write, x), They have lots of options for moving. Often the linked module contains bells and whistles that aren't really necessary; why not bring it into the module and slim it down? Please take a look at Module:RepeatString and Template talk:Repeat and see what you think. Given an instance myqobject of this class, a Lua program can emit signal mysignal as follows I just quickly sorted out the present Lua modules to Wikipedia:Lua/Modules/Overview. Almost all of us to be a lot better about putting comments up front in the module and/or documentation saying what the heck our modules are FOR. Debresser (talk) 10:57, 8 December 2013 (UTC), Is the "Wikipedia namespaces" infobox necessary top right? The redis instance enables the script to interact with the Redis server that's running The returned integer defines how many return values has been pushed to the Lua stack. Is there a way for a loadData table to contain these keys? If you need a debugger, I recommend checking out. For example, return {84 = 132}, or return {'84' = 132}, or return {0 = 00}, give errors demanding a } near the =. We really ought to decide, flip a coin, something so we get this sort of stuff to a predictable spot. 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 was wondering if there is a way to improve the performance. DePiep (talk) 23:55, 21 May 2015 (UTC). for instance, Parameters work exactly as local variables, 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. Objects implementing this interface are LNilType, LBool, LNumber, LString, LFunction, LUserData, LState, LTable, and LChannel. 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. 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. Hi, is there a way to instruct string.format to not produce trailing zeros with decimal notation? However, sometimes that is just not enough and an embedded language can be the solution. 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. Any suggestion on how to receive this parameter template as a table rather than a substituted string? My own modules populate only the pre-alpha and alpha categories, but there are some here which I know have reached the other levels. 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). To learn Lua, read Programming in Lua by Roberto Ierusalimschy. Johnuniq (talk) 09:37, 7 October 2013 (UTC). Now, with this new LUA language, template editing is becoming more and more the domain of technicians. 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. Otherwise false. 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. 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 and Right now I'm putting ratings on the documentation subpages, which I think is what someone suggested before at one point for categories. WebLua Functions - A function is a group of statements that together perform a task. In the example bellow sayHello function is first defined, and then called in the second call to DoString. Its a road map for learning Lua and my advice for how to integrate it with C/C++ code. Its stable. Because the property from Wikidata is not updated by mw.message, I decided to try it on one of those pesky Special: pages that abolish caching. Your life will be easier if you have a small C/C++ API. -Wikid77 (talk) 19:29, 22 March 2013 (UTC), When moving a module there is no redirect left behind and existing invocations should be fixed. Its minimalistic, but requires a lot of boilerplate and manual error-checking. Similarly to the previous advice, when defining classes (e.g. So the idea is the next one: But lua has a specific way to treat weblink and it is right now impossible to use a web address as a string. Vanilla Lua, the latest version, otherwise. How you divide up your code among different Prompt and friendly service as well! Sandboxing is easy. -- Don't need the "%. The parser seems to reject any effort to initialize a table in the return statement if one of the indexes is, or could be, interpreted as a number. sol2 is a fantastic library which Ive used for many years. Our compilation still gets rid of the run-time 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). Do I need to use %f and remove the trailing zeros with string.match or string.gsub? 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. Calls the concat function with the arguments Go and Lua and prints the resulting string to stdout. 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). ?0" here but useful if omit above. Check out this engine for making Zelda-likes for inspiration of how to write game code in Lua. WebYou can call a template from a Lua module using frame:expandTemplate. I'm a rookie! 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 tutorial truly helpful to me as I don't know how to convert all those examples to comply with MediaWiki's lua standard. 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. How do I fix this? An expression like o:foo(x) Toohool (talk) 18:13, 15 March 2013 (UTC). = --Iantresman (talk) 13:14, 8 December 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. 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'm a happy user of this space myself with the pet projects I develop in my free time. There is no reason to do it for functions which are already Currently it is misleading advising to check for double redirects. 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. a find-and-replace Macro that lets you write code that acts like a function, without the function overhead running an external image to lua tool, so you can just stick the images in your Project folder, and automatically include them into your lua script every time you hit F7 ! It Is Me Here t / c 15:08, 3 September 2013 (UTC). Hex (? --Rotpunkt (talk) 13:50, 9 January 2014 (UTC), mediawikiwiki:Extension talk:Scribunto/Lua reference manual #Example for string.format? You can call it with LuaJITs FFI, see the tutorial here. Or is it something else? 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. Hex (? This was possible because the wikimarkup language was very intuitive, and easy to understand even for the layman. 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. :) Wnt (talk) 02:58, 6 January 2014 (UTC). It behaves somewhat like a stack as in [Forth] but with one element. 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. E.g. (what is sometimes called procedure That is partly about performance but mostly about engine architecture. It doesnt have many gotchas. ) 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 Lua version has some differences from the current template, so I would like to get others' comments before making the switch. 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. I am trying to implement {{Horizontal timeline}} as a module. If you think that your game became slow because of Lua code, profile first before rewriting it in C++. If you're a Lua developer, please watchlist it. Page content can be retrieved with the getContent () method of the title object. ", [ [\w+\. You can find Luas reference manual here. The messages for /doc inclusion are currently added as contentlanguage, where really only their parameter should be included as such. So tonight I put together Module:Unsubst, which can be used to do the same thing without all the limitations of {{unsubst}}. Its fast. that is, to call adding o as a first extra argument. 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. try: with open("foo.txt") as f: 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). Technical 13 (talk) 12:12, 9 May 2013 (UTC). Text formatting (bold, italics) breaks when the ''/''' tags are not closed for each argument. It receives a *lua.LState and returns an integer. 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. I tried to start learning Lua and immediately hit the wall after the "hello, world" part and all I got afterward are "script error". These snippets of Python and Lua are roughly equivalent. 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. Now the tab "Modules" does not show all modules, and does not have a 'next page' link. Mr. Stradivarius talk 01:15, 29 October 2013 (UTC), How well does Scribunto defend itself against DoS, or possibly XSS, but especially DoS as we are dealing with a Turing-complete language? The syntax of the template sends another template as parameter. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. 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). If you create a local object inside the coroutine and store the reference to it in C++. how can i do this (on which module, i find this Category for translation). 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. 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)." Incnis Mrsi (talk) 22:46, 9 January 2014 (UTC). For infoboxes, which use just a few Lua functions, then running the shell-template versions, rather than direct #invoke in the infobox, would be efficient enough, but still must beware the +2 expansion depth when running a shell-template version instead of direct #invoke in the infobox. Calling Lua code is done through L.CallByParam, which takes a parameters object, P, and arguments as variadic parameters. In the first case, we use a function call as a statement; Our areas of expertise include Commercial Moving Services, Warehousing, Document Shredding and Storage Solutions. --Iantresman (talk) 00:06, 12 December 2013 (UTC). The reference manual for Lua 5.4s C API is here:, Github repo: They are iteration functions, so they add the overhead of a function call to each loop iteration. What should I do to return a large text built from numerous smaller elements? 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 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. mw:Extension:Scribunto/Lua reference manual#mw.title.makeTitle, en:Module_talk:String#Replication on other wikis,, 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,, Creative Commons Attribution-ShareAlike License 3.0. If you only want to call some C/C++ functions from Lua (or some small Lua functions from C/C++) - use Lua C API. It may sound like asking to be babysat or spoon-fed, but I'm totally stuck. 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). Servicing Stanislaus, San Joaquin and Merced Counties, 2209 Fairview Drive Suite A Ceres, CA 95307. Wnt (talk) 15:52, 22 January 2014 (UTC), Wikipedia:Lua/To do, a page you substantially contributed to, has been nominated for deletion. Page contents not supported in other languages. 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. Where I see this is commonly done is in the templates which return links to the archives of talk pages. Throughout the post L will denote a pointer to lua.LState. After the function call, Best Mr. Stradivarius talk 10:42, 27 March 2013 (UTC), You've got it pretty much right. The resty command itself has a startup and exiting overhead. Of course, you can check for this files existence and handle errors appropriately (e.g. 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). Example: L.GetTop() returns the number of arguments that was used when the function was called. Lua adjusts the number of arguments to the number of parameters, 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. in C (or in any other language used by the host application). 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). lua.CanConvToString(v LValue) - True if LString or LNumber. 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. One of the most versatile and used data structures in Lua is LTable (actually it is the only one). This doesn't, which I was hoping would be equivalent: And, how do I do the reverse, and convert to the string ""? 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. What is the equivalent of {{fullurl:page name}}? Lua is a language with implicitly dynamic data types. sign in Thank you!--QuimGil (talk) 07:52, 21 June 2013 (UTC). The LState is needed for interacting with the Lua VM, most commonly for retrieving function arguments. It's just that a central repository would be so beneficial for everybody ( devs/editors included) and can't really be (in my honest and personal opinion) that place. Calling Lua code is done through L.CallByParam, which takes a parameters object, P, and arguments as variadic parameters. For instance, all library functions are written in C; Learn more. I'm currently using the following function to get template 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). Integrating it with CMake is somewhat trickier. Its easy to integrate Lua scripts into C/C++ projects. 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. in Lua and functions defined in C. As we have seen in other examples, ), You dont need a specialized IDE or tools to write Lua comfortably. the results which can be obtained by a user with the Special:PrefixIndex page)? Writing code like this will become better with new #embed directive in future C/C++ versions, e.g. All values in Lua can be stored in variables, used as arguments when calling functions, and returned as the result of their execution. 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. That's a bit of boilerplate code that I've been using in all the modules I write. You couldn't keep track of your old experiments, and my experience is that yes, I. Work fast with our official CLI. WebTo call a Lua funcion, we first push the function onto the stack. {{. Functions can both carry out a specific task It uses heavy meta-programming to get things done. The simplest way to time some Lua code is to use the time command with the resty command. --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? For example, check Special:WhatLinksHere/3000 United States Census. I am a repeat customer and have had two good experiences with them. What to write in Lua: gameplay logic, FSMs, cutscenes, etc. For example, it is not printing the string "", and only two "" table rows, which might suggest it is not recursing properly, or perhaps something else. Toohool (talk) 17:18, 27 March 2013 (UTC), I have another related question. 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.
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