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. What should I do to return a large text built from numerous smaller elements? If nothing happens, download GitHub Desktop and try again. After your basic game engine is implemented, start with writing new code in Lua. I measured the overhead of direct and virtual C++ function calls on the Xenon PowerPC some time ago. With a clear upsream in a central place like mediawiki.org then en.wiki and other Wikimedia projects could work better on local support and whatever is specific to their communities. What do people think? 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. It stays global and doesnt get collected by a GC until it has been set to nil. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. I'd like to include some of the functionality of module:Page in my module, without having to reinvent the wheel. Debresser (talk) 10:57, 8 December 2013 (UTC), Is the "Wikipedia namespaces" infobox necessary top right? 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. The downside is it will incur a small performance impact every time a new page of callframes is allocated. 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 (~~~~). See the explanation on how to do concurrency in Lua in sol2 here (especially about lua_xmove and sol::main_object). its hard to know if what youre passing to Lua will be copied or passed by a reference). It would be a bit odd. If you create a local object inside the coroutine and store the reference to it in C++. Thanks! 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 All rights reserved. --Rotpunkt (talk) 12:35, 1 May 2013 (UTC), Hello, I'm wondering if there is currently a module that counts elements on a page. I don't think it was really a active decision. Hi, is there a way to instruct string.format to not produce trailing zeros with decimal notation? 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). Lua Performance Tips -DePiep (talk) 23:30, 19 July 2013 (UTC), Do Module:WikiLink and voy:ru::Wikilinks effectively aim to do the same thing? OUR MISSION. Similarly to the previous advice, when defining classes (e.g. And you can do even better, you can hide library details and not expose them to Lua at all which will make switching between lower-level frameworks much easier, for example: If you want to use a C library and youre using LuaJIT, you dont even need to create a binding for it at all. Needs study to guarantee correctness! See the demos and more details at WikiProject Flag Template. 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)." DePiep (talk) 23:55, 21 May 2015 (UTC). Please let me know your thoughts over at Template talk:Pagetype#Module:Pagetype. Given that each {{#ifexist:}} is an expensive parser function (EPF), these templates can consume an excessive number of EPFs. Servicing Northern California For Over 25 Years, Select The Service Your Interested InDocument ShreddingRecords ManagementPortable StorageMoving ServicesSelf StorageOffice MovingMoving Supplies. Otherwise false. Cya. That is partly about performance but mostly about engine architecture. When calling a function, 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. In the first case, we use a function call as a statement; In this case we will embed Lua using gopher-lua. Think of Lua scripts as functions - you can call them with require or do_file and they can return variables. To get the perf bit How about expanding the template's function so that we can also put at the top of template /doc pages? 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. 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"? --Iantresman (talk) 00:06, 12 December 2013 (UTC). 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 Then we call the function with lua_call (). How you divide up your code among different For example like: frame.args.row1. 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 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. To learn Lua, read Programming in Lua by Roberto Ierusalimschy. (what is sometimes called procedure You couldn't keep track of your old experiments, and my experience is that yes, I. 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. Mr. Stradivarius talk 12:54, 10 July 2013 (UTC), We have {{WikiProject Lua/header}} that does the header tabs (I started). 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:}}. If you notice that your C++ function has a huge overhead because of Lua calls, consider using this pattern: // in C++ sol::table t = lua.create_table (); for (int i = 0; i < 1000; i++) { // do stuff in C++, push data to Lua table occasionally } luaFunc (t); -- in Lua function someFunc (t) for k,v in pairs (t) do -- do stuff end end 5. The gopher-lua library operates on a interface called LValue. for example, make this work without copying the args to a new table? There are some practical functions to convert and check lua.LValue objects. n However, the basic API is quite simple, and the advanced features deserves its own post. You can divide up your code into separate functions. 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. Lua (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. An auto sizing callstack will allocate and release callstack pages on demand which will ensure the minimum amount of memory is in use at any time. For example, I might want to process the posts on a talk page, and add some extra formatting. Within C and C++, some comp 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. Thats basically all youll ever need to know about Lua. There is no reason to do it for functions which are already d 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'});. 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. 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. --HectorMoffet (talk) 11:05, 29 December 2013 (UTC). That would only apply to your contributions though, not to later modifications made by other editors. Page content can be retrieved with the getContent () method of the title object. 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. Its easy to integrate Lua scripts into C/C++ projects. thank you. lua WebYou can call a template from a Lua module using frame:expandTemplate. The XLua object also has a substantial MMF Interface for directly querying and modifying game objects and state A Go function should implement the LGFunction type to be callable from Lua. The simplest way to time some Lua code is to use the time command with the resty command. 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. They both open a file, read one line, and close it, or do nothing if there was some error opening the file. *, 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. ]], "jo")' But there is a catch. 1 time resty -e '' We can see theres overhead of about 11 milliseconds on this machine. Its a road map for learning Lua and my advice for how to integrate it with C/C++ code. What I'm trying to do is much more complicated, see Module:Convert/makeunits, but is the same issue. Wikipedia talk:Lua/Archive 1 Can one call lua function that returns sevaral strings and pass them to a template? :P Anyway, I have taken that idea and added some parameter checking and some documentation, and called it Module:User:Mr. Stradivarius/PrefixIndex. The approach of Module:Sandbox - having every user put scripts into a common receptacle - seems unworkable. And finally, see what LVE and PICO-8 do. / At the moment, we have three patterns in naming a module sandbox page: I suggest that is one too much. I'd rather see useful LUA links. 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). The value of any of these keys will never be. We could also use the template to automatically add Category:Lua-based templates to keep track of converted templates more easily. There is still lots of work to do of course, But it's a start TheDJ (talk contribs) 22:18, 18 March 2013 (UTC). Thank you!--QuimGil (talk) 07:52, 21 June 2013 (UTC). What to write in Lua: gameplay logic, FSMs, cutscenes, etc. You might also find Moonscript interesting. However, sometimes that is just not enough and an embedded language can be the solution. may be relevant to this problem. Youre unlikely to run into performance issues, unless youre making a AA/AAA game or a complex simulation program. New versions come out once in a while, but you can comfortably stay on Lua 5.2 not loose much. Lua - Functions - TutorialsPoint Wnt (talk) 23:14, 21 March 2013 (UTC), I have run many timing tests, to compare using shell templates which contain #invoke versus direct use of {#invoke:}, and for tiny templates, such as string-handling functions, the template versions often ran upto 50% slower than direct #invoke of each tiny Lua function. And to fetch an argument without conversion the L.Get(n int) function can be used. The related, but separate issue, for speed of #invoke, can quicken every use of Lua, if 1.22wmf1 successfully doubles the speed of each #invoke. Its stable. lua You can find Luas reference manual here. Hopefully this will be semi-useful again. ), You dont need a specialized IDE or tools to write Lua comfortably. now i wanted to translate Category:Pages with script errors in bn language. Formula: If nothing happens, download Xcode and try again. For example (C++ functions have cpp postfix): Ask yourself: do all these functions need to be in C++? Thanks. The fact that even an IP user may edit the module namespace suggests that it must be really stable and secure. Yes, you can replace built-in functions because they are simply functions accessed from global variables. I'm a happy user of this space myself with the pet projects I develop in my free time. Stormworks Lua with LifeBoatAPI the colon operator. In brief, the categories I set up were pre-alpha, alpha, beta, release, and protected. 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. It receives a *lua.LState and returns an integer. Sandboxing is easy. These variables are called the formal parameters of the function. The formal parameters behave like other local variables inside the function and are created upon entry into the function and destroyed upon exit. While creating a Lua function, you give a definition of what the function has to do. The sandbox Wiki code {{Special:AllPages|namespace=666}} {{CURRENTTIMESTAMP}} returns a timestamp that changes each time the page is reloaded, because caching is disabled. Makyen, does that look something like what you wanted? 2015 Nils Lagerkvist. After the function call, This is not a tutorial or step-by-step guide. Check out this engine for making Zelda-likes for inspiration of how to write game code in Lua. Snipre (talk) 07:52, 31 October 2013 (UTC), Is there a LUA method for '#ifexist' that doesn't generate false incoming links? 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. there is no difference between functions defined 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. 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? If you think that your game became slow because of Lua code, profile first before rewriting it in C++. 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. This code is OK (calling C++ from Lua is cheap): This code is not that good (calling Lua from C++ is slow): Profile first. 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. E.g. with nil arguments removed. Your help pointing to ways to improve is welcome. Still, there are a lot of options available maybe someone can think of something? Or is it something else? The problem with 3rd party bindings is that they usually tend to get unmaintained or only support a specific version of the library. -- Gets args.rowtype1, args.rowtype2, etc. Does this apply if you are accessing the module from another Lua module, and not directly from a wiki page? Ive used LuaDists CMake build scripts for Lua for many years, but LuaDist authors have stopped supporting newer Lua versions. Its fast. Its neat. Functions used by a Lua program can be defined both in Lua and WebThe Redis Lua execution context always provides a singleton instance of an object named redis . Example: L.GetTop() returns the number of arguments that was used when the function was called. Does mw.ustring.byteoffset work correctly with negative offsets? Keep your global state to a minimum and variable scope as small as possible. 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. I bypassed the most serious problem, but for some reason the method is generating incoming links to nonexisting articles. Because it makes it much easier to track dependencies between various script files and makes them load each other when theyre needed. 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. Calling the LValue.Type() returns the corresponding LValueType. 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. --Aftab1995 (talk) 15:50, 23 May 2013 (UTC), I'm very happy to announce that Template:FlagiconLua has reached feature parity with Template:Flagicon! See http://godoc.org/github.com/yuin/gopher-lua#LTable for the LTable Go API. Mr. Stradivarius talk 23:06, 1 January 2014 (UTC); Page moved without redirect. They have a great system for tracking your belongings and a system for checking to make sure you got all of your belongings once you arrive at your destination. is just another way to write o.foo(o, x), Please comment over there if you're interested. -- Gets numbers for row1, row2, etc. --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. Please lua.LVAsString(v LValue) - Converts LString and LNumber to string. 3 It behaves somewhat like a stack as in [Forth] but with one element. For example, check Special:WhatLinksHere/3000 United States Census. Link/Create testcases link for Module pages. Best Mr. Stradivarius talk 10:42, 27 March 2013 (UTC), You've got it pretty much right. I was just trying to return those hex tables via loadData and seem to have run into a nasty surprise. 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 lua.org tutorial truly helpful to me as I don't know how to convert all those examples to comply with MediaWiki's lua standard. 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. You can do procedural, functional, OO programming. This is a matter of implementation of the compiler or runtime (and its options) and cannot be said with any certainty. GitHub 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. 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). 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. Lua doesnt impose one style of writing code on you. Writing the code in it feels like writing pseudocode/prototyping. 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 Is this the right place for Lua programming queries? What is the equivalent of {{fullurl:page name}}? Objects implementing this interface are LNilType, LBool, LNumber, LString, LFunction, LUserData, LState, LTable, and LChannel. It may sound like asking to be babysat or spoon-fed, but I'm totally stuck. See discussion at Village Pump (policy)#Protection and management of scripts?. 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. Lua is a language with implicitly dynamic data types. Now the tab "Modules" does not show all modules, and does not have a 'next page' link. NeoVim, which uses Lua scripts for user script code. Everyone took really good care of our things. 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? 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. There are still a few things I'm not sure about, though. Redis Lua API reference | Redis Gut feeling is usually wrong. extra parameters get nil. 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. 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. (and object-oriented programming) in more detail. The simplest language I know. It has a GNU Make build, so building it is easy. Toohool (talk) 18:13, 15 March 2013 (UTC). laura lehn - via Google, I highly recommend Mayflower. Lua Command line parameters, environment variables, and configuration files are common ways to change the behavior of software. Throughout the post L will denote a pointer to lua.LState. 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. 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. If so, I can add Module:WikiLink to d:Q14746829. 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. Its simple. XLua Documentation - Taloncrossing Anyone interested in testing templates may want to try Module:Convert/tester which allows hundreds of tests to be easily defined. These functions does not throw errors, but will return Go default values if conversion is not possible. At least one such template will be beyond the 500 EPFs/page limit in 2015. A surprisingly simple Lua compilerExtended version 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. The advantages are a) edits to Redirect to add irrelevant features don't lead to massive queue usage, b) Redirect doesn't have to be protected, and c) in case a required module isn't protected, you don't get confused and fool around with a module you think is in limited use only to find out that you've created a huge server load. Iterative multi-file loader, used to load all Lua modules in a directory and return them as one table. And be especially careful when using coroutines. Relevant to Lua, userscripts, and user scripting generally. Will your logo be here as well?. 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 ! 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. Writing code like this will become better with new #embed directive in future C/C++ versions, e.g. mw.site.currentVersion, mw.site.scriptPath, etc etc. Johnuniq (talk) 22:58, 10 January 2014 (UTC). 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. Providing global relocations solutions, storage and warehousing platforms and destruction plans. Timing Lua Code Correctly in OpenResty 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. 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. 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). 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. 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. Servicing Stanislaus, San Joaquin and Merced Counties, 2209 Fairview Drive Suite A Ceres, CA 95307. in the second case, we use it as an expression: Lua also offers a special syntax for object-oriented calls, If you only want to call some C/C++ functions from Lua (or some small Lua functions from C/C++) - use Lua C API. Theyre mostly written in C/C++ and only expose a bunch of Lua functions/tables to the user. 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.