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). Perhaps li in a list or tr in a table? That is partly about performance but mostly about engine architecture. I very much regret that. Toohool (talk) 17:18, 27 March 2013 (UTC), I have another related question. Now you dont need to ship this init.lua with your binary and life becomes easier. 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. Clearly it's worth thinking about ways to reduce this impact as much as possible. 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'});. to use Codespaces. 1 time resty -e '' We can see theres overhead of about 11 milliseconds on this machine. ], So templates can call Lua modules, parser functions and pages in MediaWiki namespace. lua.LVIsFalse(v LValue) - Returns true if nil or false. Have there been any major incidents yet? For example, it is not printing the string "mw.site.currentVersion", and only two "mw.site.stats" table rows, which might suggest it is not recursing properly, or perhaps something else. There are a number of To(n int) functions available. 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 can acquire arguments using the frame.args object passed to a script using an iterator function: But this does not seem to work for a library such as mw.site. If you're a Lua developer, please watchlist it. Are you sure you want to create this branch? 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). Hi, is there a way to instruct string.format to not produce trailing zeros with decimal notation? For example like: frame.args.row1. --Iantresman (talk) 13:14, 8 December 2013 (UTC). -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). The simplest language I know. Will your logo be here as well?. The parameters object takes three important parameters: The following code defines a concat function in Lua. The function signature must match what you passed in. Wnt (talk) 15:52, 22 January 2014 (UTC), Wikipedia:Lua/To do, a page you substantially contributed to, has been nominated for deletion. Is there a way for a loadData table to contain these keys? All values in Lua can be stored in variables, used as arguments when calling functions, and returned as the result of their execution. For instance, all library functions are written in C; 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. 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. Your help pointing to ways to improve is welcome. The typecheck function could also store away the type info for later introspection. We now have the /doc system somewhat integrated/forced trough the Scribunto extension. Thats basically all youll ever need to know about Lua. Thanks. If that is not possible: Please suggest an alternative method to implement it. -- Sameboat - (talk) 07:07, 18 March 2013 (UTC), Thank Dragons flight for clearing something for me. And to fetch an argument without conversion the L.Get(n int) function can be used. 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. They both open a file, read one line, and close it, or do nothing if there was some error opening the file. Time-delay formula: The initial tests show a time-delay formula as roughly delay=3^(n/2000) seconds, where n is the number of parameters passed, and for n=6,000, the delay has been 3^3 or 27 seconds, or for n=7,000 then the delay has been 3^3.5 or 47 seconds. {\displaystyle d=3^{(n/2000)}.} To iterate a table, instead use for k=1, #tbl do local v = tbl [k]; It does exactly the same without the function call overhead (pairs actually returns another function which is then called for Similarly to the previous advice, when defining classes (e.g. also, if someone already wrote a module that does the same thing, let me know and I will have this one deleted. Local declaration of (built-in) Lua functions to reduce 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? In Lua, all arrays are 1-indexed, however t[0] is still valid but that would result in the lenght of the array to be off-by-one. This was possible because the wikimarkup language was very intuitive, and easy to understand even for the layman. Thank you. 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. How about expanding the template's function so that we can also put at the top of template /doc pages? n 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. Village Pump (policy)#Protection and management of scripts? Sandboxing is easy. and expressions in Lua. This is not a tutorial or step-by-step guide. "factorial: argument must be a number >= 0", -- likely something like 1=foo=bar, we need to do it as a named arg. as it does in a multiple assignment: 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? The function is followed by the arguments, in order. To get the perf bit This can result in slow compilation times, unreadable error messages and some interfaces are not that friendly (e.g. Gut feeling is usually wrong. Relevant to Lua, userscripts, and user scripting generally. If nothing happens, download GitHub Desktop and try again. 1 Answer Sorted by: 3 I would generally recommend to avoid making high volume calls into Lua. If you notice that your C++ function has a huge overhead because of Lua calls, consider using this pattern: If you dont use local to define/init a variable, it becomes a global by default. I think that this is less effective than it could be, however. 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. Sorry if this was discussed before, but I did not find relevant links in a couple of minutes. that is, to call o.foo adding o as a first extra argument. Is this a problem in my module or in Scribunto? 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. 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! Its a road map for learning Lua and my advice for how to integrate it with C/C++ code. Objects implementing this interface are LNilType, LBool, LNumber, LString, LFunction, LUserData, LState, LTable, and LChannel. --Iantresman (talk) 14:50, 8 December 2013 (UTC). --Iantresman (talk) 11:31, 9 December 2013 (UTC), Can modules "call" other modules? 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. Requires all Lua files in a given directory. To get the perf bit out of the way: the bridging code between C++/Lua has overhead compared to just calling Lua from Lua or calling C++ from C++. Providing global relocations solutions, storage and warehousing platforms and destruction plans. If you'd like to make a request, please do that too! -- Don't need the "%. 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. How much do function calls impact performance? The body of the compiled Lua function consists of a series of function calls to the helper functions, one per instruction. 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. Does mw.ustring.byteoffset work correctly with negative offsets? 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). lua Do I need to use %f and remove the trailing zeros with string.match or string.gsub? -- Sameboat - (talk) 04:26, 19 March 2013 (UTC). 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. A cross between resources, documentation, and useful links. Hex (? Extra arguments are thrown away; 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! After the function call, It may sound like asking to be babysat or spoon-fed, but I'm totally stuck. -- Gets args.rowtype1, args.rowtype2, etc. Within C and C++, some comp The process was smooth and easy. Running the Go code will yield: To run a Lua file, instead of a string, call lua.DoFile, DoFile and DoString can be called several times, and thus it can be utilized to expose Lua function. For example, return {84 = 132}, or return {'84' = 132}, or return {0 = 00}, give errors demanding a } near the =. -DePiep (talk) 11:51, 22 March 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. Can one call lua function that returns sevaral strings and pass them to a template? He has also implemented a number of incredible little libraries which Ive used in my projects: Many other great libraries can be found via LuaRocks: https://luarocks.org/. And be especially careful when using coroutines. So tonight I put together Module:Unsubst, which can be used to do the same thing without all the limitations of {{unsubst}}. The LTable type can be used for emulating namespaces and classes. It has a GNU Make build, so building it is easy. Its stable. with nil arguments removed. The docs are fantastic too. WebBut when you create thou sands of small tables, the combined overhead can be signic ant. In brief, the categories I set up were pre-alpha, alpha, beta, release, and protected. Then we call the function with lua_call (). there is no difference between functions defined 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. What to write in C++: collision detection, path finding, physics, renderer and other things that are performance critical. Installation You can download the latest release manually and include Calling the LValue.Type() returns the corresponding LValueType. You can divide up your code into separate functions. may be relevant to this problem. Lua 5.4 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. 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? 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. This makes dependencies between files hard to track and require you to manually execute some_class.lua before you can execute script.lua. I see that I can access Mediawiki libraries as simple as "mw.stat", are modules on Wikipedia accessible as easily? The message from MediaWiki:Movepagetext-noredirectfixer should warn about this, perhaps a warning like MediaWiki:Moveuserpage-warning. Reinterpreting The Lua Interpreter | Hackaday A tag already exists with the provided branch name. Your opinions on the matter are welcome; please participate in the discussion by adding your comments at Wikipedia:Miscellany for deletion/Wikipedia:Lua/To do and please be sure to sign your comments with four tildes (~~~~). 2015 Nils Lagerkvist. Then, executing script.lua would resullt in an error: SomeClass is nil. The downside is it will incur a small performance impact every time a new page of callframes is allocated. What do people think? It doesnt have many gotchas. E.g. Result #3 works correctly. Otherwise false. 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. I want to output wikitext like this: I have previously done that and it worked well, but when the text between the tags is more varied, something breaks. Of course, you can check for this files existence and handle errors appropriately (e.g. WebIt's more terse, though at the expense of the function call overhead. Our areas of expertise include Commercial Moving Services, Warehousing, Document Shredding and Storage Solutions. It would be a bit odd. the colon operator. {{. a function definition has a conventional syntax; When calling a function, Is a module supposed to do something clever in order to output tags? ) 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. Often the linked module contains bells and whistles that aren't really necessary; why not bring it into the module and slim it down? Wnt (talk) 15:56, 6 January 2014 (UTC). Still, there are a lot of options available maybe someone can think of something? I was wondering if there is a way to improve the performance. 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. Because it makes it much easier to track dependencies between various script files and makes them load each other when theyre needed. This first edition was written for Lua 5.0. 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 first question, of course, is whether we should require() at all. (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 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:}}. --Iantresman (talk) 00:06, 12 December 2013 (UTC). Writing the code in it feels like writing pseudocode/prototyping. !) 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. Many 3rd party Lua libraries usually work with Lua 5.2/5.3/5.4. Given that each {{#ifexist:}} is an expensive parser function (EPF), these templates can consume an excessive number of EPFs. 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"). It can do everything youd ever want from Lua and even more. 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. Iterative multi-file loader, used to load all Lua modules in a directory and return them as one table. There was a problem preparing your codespace, please try again. ", [ [\w+\. That overhead might be removed if we made save/restore a built-in operation in Lua. The gopher-lua library operates on a interface called LValue. I'm currently using the following function to get template arguments. It behaves somewhat like a stack as in [Forth] but with one element. You can do procedural, functional, OO programming. WebLua Functions - A function is a group of statements that together perform a task. Download the official Lua source code here: https://www.lua.org/download.html. For example, Module:Navbar contains the code: In what case would frame not be equal to mw.getCurrentFrame()? 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. Unfortunately, I have not yet been able to think of a way to mix this logic to get what I want, namely a way to control whether results are updated daily or weekly, etc., because I haven't thought of a way by which the logic of whether time has passed will always be evaluated but the logic of the page content will not be, unless the time has come, at which point the caching should be updated on that page. 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? For instance, if we have a function like. These functions does not throw errors, but will return Go default values if conversion is not possible. -Wikid77 (talk) 19:29, 22 March 2013 (UTC), When moving a module there is no redirect left behind and existing invocations should be fixed. ), The disadvantage of course is that bugfixes in modules like Redirect don't get passed on. The less data is shared between C++ and Lua, the better. 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. 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). is there a better way to do this? Please don't take those *personal* suggestions as a criticism to Wikipedia:Lua. (At least script error should be shown when print function is detected.) What to write in Lua: gameplay logic, FSMs, cutscenes, etc. You can download the latest release manually and include it in your project, or you can install it in your project directory through Luvit's package manager Lit, using the install command. 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. Fantastic help. You can call a function with a number of arguments different from 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). --SocietyBox (talk) 02:26, 20 January 2014 (UTC). 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. Anomie 03:36, 1 November 2013 (UTC), User:Wnt and I have had a little disagreement over the type parameter of the {{lua}} template. 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. 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. There are still a few things I'm not sure about, though. 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. For optional arguments the L.Opt(n int, default T) functions can be used. I don't think it was really a active decision. Example: L.GetTop() returns the number of arguments that was used when the function was called. At least one such template will be beyond the 500 EPFs/page limit in 2015. now i wanted to translate Category:Pages with script errors in bn language. ( If you think that your game became slow because of Lua code, profile first before rewriting it in C++. Functions used by a Lua program can be defined both in Lua and However, after writing up Module:Hex, which hex dumps the contents of strings, I was looking at the talk page when I noticed that the hex-dump of the contents of a strip marker (the example with UNIQ QINU) are changing every single time I hit the Talk tab or browser reload button to reload the page, even when I'm completely logged out with scripts disabled! 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). The messages for /doc inclusion are currently added as contentlanguage, where really only their parameter should be included as such. 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). Cya. Using the L.CheckTypes function equate to checking the type manually and then calling L.TypeError(n int, message string) if there is an error. One of the most versatile and used data structures in Lua is LTable (actually it is the only one). You can call it with LuaJITs FFI, see the tutorial here. . sol2 is a fantastic library which Ive used for many years. 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. The value of any of these keys will never be. Otherwise empty string. New versions come out once in a while, but you can comfortably stay on Lua 5.2 not loose much. It receives a *lua.LState and returns an integer. I am trying to implement {{Horizontal timeline}} as a module. At the moment, we have three patterns in naming a module sandbox page: I suggest that is one too much. Much better! I measured the overhead of direct and virtual C++ function calls on the Xenon PowerPC some time ago.
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