What should I do to return a large text built from numerous smaller elements? :P Anyway, I have taken that idea and added some parameter checking and some documentation, and called it Module:User:Mr. Stradivarius/PrefixIndex. !) 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. 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. lua 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. 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. powered by Hugo 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 --Iantresman (talk) 14:50, 8 December 2013 (UTC). The first clause supports the case where the module is being invoked from a template as {{#invoke: Navbar | navbar}}. I wonder if there's any actually helpful tutorial for those already familiar with Wikisyntax but without other computer language experience like Lua or C. The tutorials I found usually begin with a simple code to tell you to copy-and-paste (hello, world) then look at the outcome. Then we call the function with lua_call (). For instance, all library functions are written in C; An expression like o:foo(x) It may sound like asking to be babysat or spoon-fed, but I'm totally stuck. WebIt's more terse, though at the expense of the function call overhead. ( Johnuniq (talk) 02:22, 25 June 2013 (UTC). Mr. Stradivarius talk 12:54, 10 July 2013 (UTC), We have {{WikiProject Lua/header}} that does the header tabs (I started). 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. -- Don't need the "%. For instance, all library functions are written in C; its number of parameters. 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. Thanks. Lua doesnt impose one style of writing code on you. Youre unlikely to run into performance issues, unless youre making a AA/AAA game or a complex simulation program. I'm currently using the following function to get template arguments. 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). -- Gets numbers for row1, row2, etc. I think it really depends on the language and on the function. While the c and c++ compilers can inline a lot of functions, this is not the case fo 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 / Please take a look at Module:RepeatString and Template talk:Repeat and see what you think. . Text formatting (bold, italics) breaks when the ''/''' tags are not closed for each argument. Perhaps li in a list or tr in a table? Servicing Northern California For Over 25 Years, Select The Service Your Interested InDocument ShreddingRecords ManagementPortable StorageMoving ServicesSelf StorageOffice MovingMoving Supplies. is to create and maintain customer confidence with our services and communication. --Vriullop (talk) 11:07, 22 March 2013 (UTC). 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. Frietjes (talk) 00:03, 4 July 2013 (UTC), At the moment we have the {{lua talk}} template to use on talk pages of templates converted to Lua. You can find Luas reference manual here. Example: L.GetTop() returns the number of arguments that was used when the function was called. -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). Within C and C++, some comp Still, there are a lot of options available maybe someone can think of something? The parameters object takes three important parameters: The following code defines a concat function in Lua. 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. Vanilla Lua, the latest version, otherwise. Anyone interested in testing templates may want to try Module:Convert/tester which allows hundreds of tests to be easily defined. Lua is a language with implicitly dynamic data types. 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. 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). :) Wnt (talk) 02:58, 6 January 2014 (UTC). Can they be rewritten in Lua, perhaps? If so, I can add Module:WikiLink to d:Q14746829. I see that I can access Mediawiki libraries as simple as "mw.stat", are modules on Wikipedia accessible as easily? 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). At the moment, we have three patterns in naming a module sandbox page: I suggest that is one too much. --Iantresman (talk) 11:31, 9 December 2013 (UTC), Can modules "call" other modules? Does mw.ustring.byteoffset work correctly with negative offsets? Of course, you can check for this files existence and handle errors appropriately (e.g. 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. Given that each {{#ifexist:}} is an expensive parser function (EPF), these templates can consume an excessive number of EPFs. Older versions of Lua created empty tables with some pre-all ocated slots (four, if I This is a matter of implementation of the compiler or runtime (and its options) and cannot be said with any certainty. 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). 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. Is there a way for a loadData table to contain these keys? Thank you. WebBut when you create thou sands of small tables, the combined overhead can be signic ant. Work fast with our official CLI. WebTo call a Lua funcion, we first push the function onto the stack. 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. Should I return a sequence of hundreds of strings relying on Scribunto in concatenating it? 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? Does this apply if you are accessing the module from another Lua module, and not directly from a wiki page? This doesn't, which I was hoping would be equivalent: And, how do I do the reverse, and convert mw.site.currentVersion to the string "mw.site.currentVersion"? 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. I'm a happy user of this space myself with the pet projects I develop in my free time. 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 {\displaystyle d=3^{(n/2000)}.} Functions can both carry out a specific task 1 time resty -e 'ngx.re.find ("hello, world. laura lehn - via Google, I highly recommend Mayflower. {{. lua.LVAsBool(v LValue) - Convert to bool, nil and false becomes false. 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. Village Pump (policy)#Protection and management of scripts? 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'});. : Overusing them makes code harder to understand because now you need to make sure that the object youre are pointing to doesnt change unexpectedly. What is the equivalent of {{fullurl:page name}}? 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). Theyre mostly written in C/C++ and only expose a bunch of Lua functions/tables to the user. Can templates, MediaWiki pages or parser functions be called from Lua? Casey Moving Systems is family owned and has been servicing Northern California for over 25 years. 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. 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). Technical 13 (talk) 12:12, 9 May 2013 (UTC). ) Toohool (talk) 18:13, 15 March 2013 (UTC). Dont put too much code into one script - its easy to separate everything into smaller scripts. Does someone have an idea how to code this feature? I didn't use Special:ExpandTemplates, though - I really did just forget my curly braces. It doesnt have many gotchas. 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). We really ought to decide, flip a coin, something so we get this sort of stuff to a predictable spot. Objects implementing this interface are LNilType, LBool, LNumber, LString, LFunction, LUserData, LState, LTable, and LChannel. Programming in Lua : 5 If you think that your game became slow because of Lua code, profile first before rewriting it in C++. Isnt it great? To learn Lua, read Programming in Lua by Roberto Ierusalimschy. Updated link. Hopefully this will be semi-useful again. 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. Otherwise true. Frietjes (talk) 16:17, 30 October 2013 (UTC). In the first case, we use a function call as a statement; --Rotpunkt (talk) 13:50, 9 January 2014 (UTC), mediawikiwiki:Extension talk:Scribunto/Lua reference manual #Example for string.format? Learn more. Its stable. 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. Ultimately MediaWiki should issue another tutorial for Wikipedians (without prior knowledge of C and Lua) due to the differences from standard Lua. 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. 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. 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. What functions should be called in C++ gameloop from Relevant to Lua, userscripts, and user scripting generally. 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. The redis instance enables the script to interact with the Redis server that's running after imported i find error in article with this Category:Pages with script errors. 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. Mr. Stradivarius talk 23:06, 1 January 2014 (UTC); Page moved without redirect. Hi, is there a way to instruct string.format to not produce trailing zeros with decimal notation? You can easily create a Lua state which wont have any functions from the standard library (I/O, coroutines, tables etc. Most of the time, you only need one Lua state (lua_State in Lua C API and sol::state in sol2) for everything. Have there been any major incidents yet? Everyone took really good care of our things. Will your logo be here as well?. 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. That would only apply to your contributions though, not to later modifications made by other editors. 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. 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 couldn't keep track of your old experiments, and my experience is that yes, I. - basically everything else that doesnt interact with low-level OS APIs much. How do I fix this? The gopher-lua library operates on a interface called LValue. See http://godoc.org/github.com/yuin/gopher-lua#LTable for the LTable Go API. now i wanted to translate Category:Pages with script errors in bn language. Incnis Mrsi (talk) 22:46, 9 January 2014 (UTC). For instance, if we have a function like. Similarly to the previous advice, when defining classes (e.g. in Lua and functions defined in C. As we have seen in other examples, Formula: 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. is just another way to write o.foo(o, x), I've taken some steps to bring it partially in line with our Template documentation system. Greetings Stephan Kulla (talk) 15:54, 19 May 2013 (UTC), (Sorry for writing here. Clearly it's worth thinking about ways to reduce this impact as much as possible. A tag already exists with the provided branch name. Please don't take those *personal* suggestions as a criticism to Wikipedia:Lua. WebThe Redis Lua execution context always provides a singleton instance of an object named redis . The simplest language I know. It behaves somewhat like a stack as in [Forth] but with one element. One of the most versatile and used data structures in Lua is LTable (actually it is the only one). The resty command itself has a startup and exiting overhead. A language variable can contain values of any type. Servicing Stanislaus, San Joaquin and Merced Counties, 2209 Fairview Drive Suite A Ceres, CA 95307. There are still a few things I'm not sure about, though. Throughout the post L will denote a pointer to lua.LState. Redis Lua API reference | Redis http://godoc.org/github.com/yuin/gopher-lua, http://github.com/otm/embedding-lua-in-go, http://godoc.org/github.com/yuin/gopher-lua#LTable. It has a GNU Make build, so building it is easy. ), The disadvantage of course is that bugfixes in modules like Redirect don't get passed on. I used their packing and moving service the first time and the second time I packed everything and they moved it. is there a better way to do this? The less data is shared between C++ and Lua, the better. If you create a local object inside the coroutine and store the reference to it in C++. I very much regret that. try: with open("foo.txt") as f: At least one such template will be beyond the 500 EPFs/page limit in 2015. You can divide up your code into separate functions. sol2 is a fantastic library which Ive used for many years. I get an error message when I use it. 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. 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. to use Codespaces. 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. So its better to do it on Lua side, unless you make a C++ API which has to accept tables for ease-of-use - then you dont have much choice (but you can still wrap them into Lua functions and call C++ function internally). 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. I've been trying to get to grips with the concept of frames, and I think I'm almost there. Given an instance myqobject of this class, a Lua program can emit signal mysignal as follows To get automatic errors the L.Check(n int) family of functions can be used; They throw a Lua error if the type check fails. I'm a rookie! These snippets of Python and Lua are roughly equivalent. 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)." 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. In the example bellow sayHello function is first defined, and then called in the second call to DoString. 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. What am I doing wrong? Please comment over there if you're interested. There are some practical functions to convert and check lua.LValue objects. 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. 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. 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. For example (C++ functions have cpp postfix): Ask yourself: do all these functions need to be in C++? 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. The problem with 3rd party bindings is that they usually tend to get unmaintained or only support a specific version of the library. 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). The overhead of a virtual function call was 13.2 nanoseconds, or 42 clock cycles, compared to inline. Enrique Garca Cota has a lot of great articles about Lua: http://kiki.to/. The message from MediaWiki:Movepagetext-noredirectfixer should warn about this, perhaps a warning like MediaWiki:Moveuserpage-warning. I've created a new request page for Lua scripts at Wikipedia:Lua requests. Because it makes it much easier to track dependencies between various script files and makes them load each other when theyre needed. 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). 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 (~~~~). There is still lots of work to do of course, But it's a start TheDJ (talk contribs) 22:18, 18 March 2013 (UTC). Installation You can download the latest release manually and include mw.site.currentVersion, mw.site.scriptPath, etc etc. I was wondering if there is a way to improve the performance. --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? Otherwise empty string. or compute and return values. Often the linked module contains bells and whistles that aren't really necessary; why not bring it into the module and slim it down? For example, return {84 = 132}, or return {'84' = 132}, or return {0 = 00}, give errors demanding a } near the =. 3 If nothing happens, download GitHub Desktop and try again. 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. If anyone could help me to work this out I'd be very grateful. -Wikid77 (talk) 19:29, 22 March 2013 (UTC), When moving a module there is no redirect left behind and existing invocations should be fixed. I would generally recommend to avoid making high volume calls into Lua. 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. Is it a good idea to deviate from the template standard of calling pages with testcases, tests for the module namespace? Iterative multi-file loader, used to load all Lua modules in a directory and return them as one table. And finally, see what LVE and PICO-8 do. lua Many 3rd party Lua libraries usually work with Lua 5.2/5.3/5.4. Please let me know your thoughts over at Template talk:Pagetype#Module:Pagetype. I'd rather see useful LUA links. Thanks! That overhead might be removed if we made save/restore a built-in operation in Lua. lua Its minimalistic, but requires a lot of boilerplate and manual error-checking. -DePiep (talk) 23:30, 19 July 2013 (UTC), Do Module:WikiLink and voy:ru::Wikilinks effectively aim to do the same thing? lua.LVAsString(v LValue) - Converts LString and LNumber to string. 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. Is this the right place for Lua programming queries? This first edition was written for Lua 5.0. For example, Module:Navbar contains the code: In what case would frame not be equal to mw.getCurrentFrame()? What I'm trying to do is much more complicated, see Module:Convert/makeunits, but is the same issue. That's a bit of boilerplate code that I've been using in all the modules I write. Preceding unsigned comment added by Ryn78 (talk contribs) 03:27, 13 October 2013 (UTC), Is it possible for a module to invoke another module? the colon operator. 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. You choose what Lua code can and cant do.