its number of parameters. -Wikid77 (talk) 12:07, 24 March 2013 (UTC). 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. - basically everything else that doesnt interact with low-level OS APIs much. The first clause supports the case where the module is being invoked from a template as {{#invoke: Navbar | navbar}}. 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). At Module:DisplayLuaTableContents I see numerous loops as, , but I learned that strings are immutable and hence this assignment is rather costly. 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. 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. 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). The redis instance enables the script to interact with the Redis server that's running Thank you!--QuimGil (talk) 07:52, 21 June 2013 (UTC). 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. In this case we will embed Lua using gopher-lua. After the function call, Then, executing script.lua would resullt in an error: SomeClass is nil. Hex (? Iterative multi-file loader, used to load all Lua modules in a directory and return them as one table. Toohool (talk) 18:13, 15 March 2013 (UTC). It is superfluous if you only call the function once within the scope of the local variable, but that is pretty rare. 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! 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++. 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. 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. WebLua scripts have the same capability with calling MMF events. 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. Its neat. Hence, for Lua, the alternative is to pass fewer parameters, but as strings of choices delimited by separator characters within each string. 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. Command line parameters, environment variables, and configuration files are common ways to change the behavior of software. The reference manual for Lua 5.4s C API is here: https://www.lua.org/manual/5.4/manual.html#4, Github repo: https://github.com/ThePhD/sol2. This code is OK (calling C++ from Lua is cheap): This code is not that good (calling Lua from C++ is slow): Profile first. With your own bindings, you can control what version you use and how the exposed API looks in Lua. It may sound like asking to be babysat or spoon-fed, but I'm totally stuck. 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. Then, see if you really need to move this code (or parts of it) to C++. Calling Lua code is done through L.CallByParam, which takes a parameters object, P, and arguments as variadic parameters. Please 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. 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. now i wanted to translate Category:Pages with script errors in bn language. I measured the overhead of direct and virtual C++ function calls on the Xenon PowerPC some time ago. That's a bit of boilerplate code that I've been using in all the modules I write. try: with open("foo.txt") as f: --HectorMoffet (talk) 11:05, 29 December 2013 (UTC). 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? There was a problem preparing your codespace, please try again. 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. This is a matter of implementation of the compiler or runtime (and its options) and cannot be said with any certainty. For optional arguments the L.Opt(n int, default T) functions can be used. 1 time resty -e '' We can see theres overhead of about 11 milliseconds on this machine. 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. Its minimalistic, but requires a lot of boilerplate and manual error-checking. How about expanding the template's function so that we can also put at the top of template /doc pages? It would be a bit odd. For example (C++ functions have cpp postfix): Ask yourself: do all these functions need to be in C++? The resty command itself has a startup and exiting overhead. 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. The LTable type can be used for emulating namespaces and classes. Also, your feedback here about the best way to organize the data is also welcome. or subroutine in other languages) lua.CanConvToString(v LValue) - True if LString or LNumber. 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. See the demos and more details at WikiProject Flag Template. Text formatting (bold, italics) breaks when the ''/''' tags are not closed for each argument. may be relevant to this problem. Can someone make a nice SpecialPages adjustment? 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. 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. Do I need to use %f and remove the trailing zeros with string.match or string.gsub? There are still a few things I'm not sure about, though. Vanilla Lua, the latest version, otherwise. I'm currently using the following function to get template arguments. Just some of our awesome clients tat we had pleasure to work with. NeoVim, which uses Lua scripts for user script code. -- Gets args.rowtype1, args.rowtype2, etc. --Vriullop (talk) 11:07, 22 March 2013 (UTC). that is, to call o.foo adding o as a first extra argument. WebBut when you create thou sands of small tables, the combined overhead can be signic ant. WebLua programs can emit signals using the function call syntax. --Iantresman (talk) 14:56, 12 December 2013 (UTC), --Iantresman (talk) 09:36, 13 December 2013 (UTC), Does our implementation allow Lua scripts access to whether the user is logged in or not? All values in Lua can be stored in variables, used as arguments when calling functions, and returned as the result of their execution. (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? The process was smooth and easy. If that is not possible: Please suggest an alternative method to implement it. 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. The approach of Module:Sandbox - having every user put scripts into a common receptacle - seems unworkable. 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. Providing global relocations solutions, storage and warehousing platforms and destruction plans. That is partly about performance but mostly about engine architecture. its hard to know if what youre passing to Lua will be copied or passed by a reference). It Is Me Here t / c 15:08, 3 September 2013 (UTC). In our C++ file, we need to define the consoleLog function that it will receive from JavaScript. Please comment over there if you're interested. That overhead might be removed if we made save/restore a built-in operation in 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. Otherwise false. Needs study to guarantee correctness! Otherwise empty string. I've been trying to get to grips with the concept of frames, and I think I'm almost there. 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. These timings are likely different on different processor Sorry if this was discussed before, but I did not find relevant links in a couple of minutes. 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. 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. For instance, all library functions are written in C; They are iteration functions, so they add the overhead of a function call to each loop iteration. I was going to deploy it on Template:Year in other calendars/testcases, but in my preview it runs out of time by the time it gets to the last test. Lua is a language with implicitly dynamic data types. You can even create small domain specific languages thanks to Luas syntax sugar. Johnuniq (talk) 06:53, 11 October 2013 (UTC), Doesn't Wikipedia's version of Lua allow the GetURL function (or equivalent)? They both open a file, read one line, and close it, or do nothing if there was some error opening the file. This is not a tutorial or step-by-step guide. John Victor - via Google, Very nice owner, extremely helpful and understanding Older versions of Lua created empty tables with some pre-all ocated slots (four, if I Are you sure you want to create this branch? Now, with this new LUA language, template editing is becoming more and more the domain of technicians. 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. 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 --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? Our areas of expertise include Commercial Moving Services, Warehousing, Document Shredding and Storage Solutions. My own modules populate only the pre-alpha and alpha categories, but there are some here which I know have reached the other levels. Similarly to the previous advice, when defining classes (e.g. For example like: frame.args.row1. Anomie 03:36, 1 November 2013 (UTC), User:Wnt and I have had a little disagreement over the type parameter of the {{lua}} template. 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 simplest way to time some Lua code is to use the time command with the resty command. 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? -- Gets numbers for row1, row2, etc. Youre unlikely to run into performance issues, unless youre making a AA/AAA game or a complex simulation program. If you're a Lua developer, please watchlist it. Many 3rd party Lua libraries usually work with Lua 5.2/5.3/5.4. I'd rather see useful LUA links. 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. 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. 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. Download the official Lua source code here: https://www.lua.org/download.html. Yes, you can replace built-in functions because they are simply functions accessed from global variables. To do this it calls the Lua bytecode compiler and then it converts the bytecode to C. For each function in the module, the code generator produces an appropriate function header and then it iterates over the functions bytecodes, outputting a block of C code for each instruction. 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. I'm a rookie! 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. Does someone have an idea how to code this feature? 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). Also explains why the uselang=qqq hack doesn't work to show the scribunto messages. Relevant to Lua, userscripts, and user scripting generally. The sandbox Wiki code {{Special:AllPages|namespace=666}} {{CURRENTTIMESTAMP}} returns a timestamp that changes each time the page is reloaded, because caching is disabled. We really ought to decide, flip a coin, something so we get this sort of stuff to a predictable spot. If those restrictions are not a problem, the new tester provides a convenient way to set up tests on any page, for example: If the above tests were at page "Template:Example/tests", the following would insert a table showing the results of expanding each template and comparing its output with the expected text. Maybe. The compiler might decide "hey, this function is only called a few times, and I'm supposed to optimize for speed, so I'll just inline this f You can find Luas reference manual here. 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? (what is sometimes called procedure Prompt and friendly service as well! You can write entire games in Lua without ever touching C/C++. DePiep (talk) 23:55, 21 May 2015 (UTC). 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. Makyen (talk) 05:58, 1 January 2014 (UTC), That makes sense. 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). Its stable. I don't think it was really a active decision. In brief, the categories I set up were pre-alpha, alpha, beta, release, and protected. --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. Can templates, MediaWiki pages or parser functions be called from Lua? WebLua Functions - A function is a group of statements that together perform a task. You might also find Moonscript interesting. Have there been any major incidents yet? There are a number of To(n int) functions available. See discussion at Village Pump (policy)#Protection and management of scripts?. For instance, all library functions are written in C; Can they be rewritten in Lua, perhaps? You can call it with LuaJITs FFI, see the tutorial here. Check out this engine for making Zelda-likes for inspiration of how to write game code in Lua. Hence, passing 2,000 parameters runs 3 seconds, 4,000 parameters runs 13 seconds, or 6,000 parameters run 27 seconds. 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. how can i do this (on which module, i find this Category for translation). We could also use the template to automatically add Category:Lua-based templates to keep track of converted templates more easily. mw.site.currentVersion, mw.site.scriptPath, etc etc. For example: Instead I need to output: "0.00001 1.2 3". -- Sameboat - (talk) 07:07, 18 March 2013 (UTC), Thank Dragons flight for clearing something for me. lua.LVAsString(v LValue) - Converts LString and LNumber to string. Learn more. Affects Lua, templates & parser functions: Again, the time-delay overhead, to pass thousands of parameters, not only affects the Lua #invoke interface, it extends the same exponential time-delay slowdown in passing parameters to templates as well as "|x=" branch-choices in a #switch function (which also runs 27 seconds to process 6,000 branches). If nothing happens, download GitHub Desktop and try again. 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"). itch.io was written with it and it compiles to vanilla Lua. 2000 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. How to implement action sequences and cutscenes in Lua, Making and storing references to game objects (entities) in C++ and Lua, https://www.lua.org/manual/5.4/manual.html#4. extra parameters get nil. The downside is it will incur a small performance impact every time a new page of callframes is allocated. Village Pump (policy)#Protection and management of scripts? 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. In Chapter 16 we will discuss such calls Please let me know your thoughts over at Template talk:Pagetype#Module:Pagetype. However: This overhead may be trivial compared to what the body of 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. 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. The parameters object takes three important parameters: The following code defines a concat function in Lua. Preceding unsigned comment added by Ryn78 (talk contribs) 03:27, 13 October 2013 (UTC), Is it possible for a module to invoke another module? lua.LVAsBool(v LValue) - Convert to bool, nil and false becomes false. What I'm trying to do is much more complicated, see Module:Convert/makeunits, but is the same issue. lua.LVIsFalse(v LValue) - Returns true if nil or false. You couldn't keep track of your old experiments, and my experience is that yes, I. I would have been able to continue contributing to these and other interesting templates. Its simple. 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. d :) Wnt (talk) 02:58, 6 January 2014 (UTC). Page contents not supported in other languages. The less data is shared between C++ and Lua, the better. Given an instance myqobject of this class, a Lua program can emit signal mysignal as follows Or is it something else? I used their packing and moving service the first time and the second time I packed everything and they moved it. a function definition has a conventional syntax; Casey Moving Systems is family owned and has been servicing Northern California for over 25 years. The XLua object also has a substantial MMF Interface for directly querying and modifying game objects and state 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). Johnuniq (talk) 09:37, 7 October 2013 (UTC). Can do a lot of automagic and save you from writing tons of boilerplate code, which you need to do if you use other bindings or Lua C API. Please don't take those *personal* suggestions as a criticism to Wikipedia:Lua. And finally, see what LVE and PICO-8 do. You can easily create a Lua state which wont have any functions from the standard library (I/O, coroutines, tables etc. With those it's not entirely clear if they are meant to go together or not. The functions in question had a single parame = You can call a function with a number of arguments different from *, 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. Debresser (talk) 10:57, 8 December 2013 (UTC), Is the "Wikipedia namespaces" infobox necessary top right? Frietjes (talk) 16:17, 30 October 2013 (UTC). as it does in a multiple assignment: This came up over at Template talk:Historical populations. The function signature must match what you passed in. However, the basic API is quite simple, and the advanced features deserves its own post. Gut feeling is usually wrong. 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. Because it makes it much easier to track dependencies between various script files and makes them load each other when theyre needed. 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. Otherwise true. Given that each {{#ifexist:}} is an expensive parser function (EPF), these templates can consume an excessive number of EPFs. Objects implementing this interface are LNilType, LBool, LNumber, LString, LFunction, LUserData, LState, LTable, and LChannel. -- Don't need the "%. 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? Mr. Stradivarius talk 12:54, 10 July 2013 (UTC), We have {{WikiProject Lua/header}} that does the header tabs (I started). 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. For example, return {84 = 132}, or return {'84' = 132}, or return {0 = 00}, give errors demanding a } near the =. ) This concept might be extended to support more than one memory location: The LState is needed for interacting with the Lua VM, most commonly for retrieving function arguments. The system compares actual template output with fixed text, and is only suitable for templates and results that are reasonably short because each template and its expected result have to be in one line. I was wondering if there is a way to improve the performance. the colon operator. Automatic transclusion of protection templates was added. 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. This is typically done with a copyright template placed on your user page though you might want to modify one of them to specify that it only applies to Lua modules. [feature X] (images/feature-x.png) Multi-MC Simulation laura lehn - via Google, I highly recommend Mayflower. When programming in Lua, you may use constructors to avoid th ose initial rehashings. When you write {true, true, true} , Lua knows beforehand that the table will need three slots in its array part, so Lua creat es the table with that size. ", [ [\w+\. Writing the code in it feels like writing pseudocode/prototyping. Where I see this is commonly done is in the templates which return links to the archives of talk pages. On each conflict, this function will be passed the conflicted key, the current value that load() is attempting to save, the value that is currently stored in the conflicted key, and a table of metadata consisting of the following: Please note that these keys are created and updated automatically by load() and should not be altered manually. Theyre mostly written in C/C++ and only expose a bunch of Lua functions/tables to the user. It stays global and doesnt get collected by a GC until it has been set to nil. with nil arguments removed. Functions used by a Lua program can be defined both in Lua and 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 I didn't use Special:ExpandTemplates, though - I really did just forget my curly braces. 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.
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