See the demos and more details at WikiProject Flag Template. as it does in a multiple assignment: 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. Can someone make a nice SpecialPages adjustment? This concept might be extended to support more than one memory location: I've taken some steps to bring it partially in line with our Template documentation system. ]], "jo")' But there is a catch. n At the moment, we have three patterns in naming a module sandbox page: I suggest that is one too much. I'm a rookie! The problem with 3rd party bindings is that they usually tend to get unmaintained or only support a specific version of the library. Calling the LValue.Type() returns the corresponding LValueType. Thanks. Makyen (talk) 05:58, 1 January 2014 (UTC), That makes sense. See a simple example of how to build Lua with CMake and use it with sol2 here. 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. 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. Similarly to the previous advice, when defining classes (e.g. If you only want to call some C/C++ functions from Lua (or some small Lua functions from C/C++) - use Lua C API. If so, I can add Module:WikiLink to d:Q14746829. 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. The resty command itself has a startup and exiting overhead. To get the perf bit Wnt (talk) 15:52, 22 January 2014 (UTC), Wikipedia:Lua/To do, a page you substantially contributed to, has been nominated for deletion. Dealing with C++ objects in Lua is much harder than dealing with native types. We now have the /doc system somewhat integrated/forced trough the Scribunto extension. How much do function calls impact performance? Makyen, does that look something like what you wanted? / *, 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. is there a better way to do this? Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Requires all Lua files in a given directory. --Iantresman (talk) 00:06, 12 December 2013 (UTC). This is a matter of implementation of the compiler or runtime (and its options) and cannot be said with any certainty. lua.LVAsString(v LValue) - Converts LString and LNumber to string. 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. in Lua and functions defined in C. As we have seen in other examples, However, sometimes that is just not enough and an embedded language can be the solution. The downside is it will incur a small performance impact every time a new page of callframes is allocated. Writing the code in it feels like writing pseudocode/prototyping. lua Then we call the function with lua_call (). The process was smooth and easy. New versions come out once in a while, but you can comfortably stay on Lua 5.2 not loose much. 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. Right now I'm putting ratings on the documentation subpages, which I think is what someone suggested before at one point for categories. It behaves somewhat like a stack as in [Forth] but with one element. sign in I would use them again if needed. Toohool (talk) 17:18, 27 March 2013 (UTC), I have another related question. The XLua object also has a substantial MMF Interface for directly querying and modifying game objects and state to use Codespaces. Lua is written in ANSI C, so it can compile almost everywhere. Is there a programme wizard who can help see if I've done something stupid? If you create a local object inside the coroutine and store the reference to it in C++. 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. Use Git or checkout with SVN using the web URL. I'd rather see useful LUA links. 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). 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 ! Then, executing script.lua would resullt in an error: SomeClass is nil. 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. Toohool (talk) 18:13, 15 March 2013 (UTC). However, if we standardize this, with the names copied verbatim and the fairly distinctive capital letter after the /, it should be easy to have a bot notify the author(s) of Module:Submit an edit request automatically when Redirect is updated. Its fast. Does this apply if you are accessing the module from another Lua module, and not directly from a wiki page? Hex (? Redis Lua API reference | Redis For instance, all library functions are written in C; Reinterpreting The Lua Interpreter | Hackaday lua.LVAsBool(v LValue) - Convert to bool, nil and false becomes false. initialized with the actual arguments given in the function call. They are iteration functions, so they add the overhead of a function call to each loop iteration. Since Lua has lexical scope at the block level rather than the function level, this works similarly to the way Python calls __exit__. lua.CanConvToString(v LValue) - True if LString or LNumber. Dont put too much code into one script - its easy to separate everything into smaller scripts. Preceding unsigned comment added by Ryn78 (talk contribs) 03:27, 13 October 2013 (UTC), Is it possible for a module to invoke another module? Village Pump (policy)#Protection and management of scripts? 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. try: with open("foo.txt") as f: 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. Of course, you can check for this files existence and handle errors appropriately (e.g. The overhead of a virtual function call was 13.2 nanoseconds, or 42 clock cycles, compared to inline. The message from MediaWiki:Movepagetext-noredirectfixer should warn about this, perhaps a warning like MediaWiki:Moveuserpage-warning. I'm thinking by this point that it would be better to just develop an explicit tool to control caching, and some mechanisms (if they don't already exist) to audit what pages are not cached and identifying the worst reloaders) Wnt (talk) 15:48, 13 January 2014 (UTC). I would generally recommend to avoid making high volume calls into Lua. :) Wnt (talk) 02:58, 6 January 2014 (UTC). A cross between resources, documentation, and useful links. If an argument to a function can be of more then one type the L.CheckTypes(n int, types LValueType) function can be used to check and yield an error to the user. 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 C (or in any other language used by the host application). Relevant to Lua, userscripts, and user scripting generally. lua --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? 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. Johnuniq (talk) 06:53, 11 October 2013 (UTC), Doesn't Wikipedia's version of Lua allow the GetURL function (or equivalent)? Its a road map for learning Lua and my advice for how to integrate it with C/C++ code. If that is not possible: Please suggest an alternative method to implement it. Does mw.ustring.byteoffset work correctly with negative offsets? Now you dont need to ship this init.lua with your binary and life becomes easier. All values in Lua can be stored in variables, used as arguments when calling functions, and returned as the result of their execution. 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? WebIt's more terse, though at the expense of the function call overhead. The typecheck function could also store away the type info for later introspection. 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. ], So templates can call Lua modules, parser functions and pages in MediaWiki namespace. Otherwise empty string. There are some practical functions to convert and check lua.LValue objects. Ive used LuaDists CMake build scripts for Lua for many years, but LuaDist authors have stopped supporting newer Lua versions. If nothing happens, download Xcode and try again. In this case we will embed Lua using gopher-lua. If you'd like to make a request, please do that too! how can i do this (on which module, i find this Category for translation). 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 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). And to fetch an argument without conversion the L.Get(n int) function can be used. I just quickly sorted out the present Lua modules to Wikipedia:Lua/Modules/Overview. 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. A Go function should implement the LGFunction type to be callable from Lua. This code is OK (calling C++ from Lua is cheap): This code is not that good (calling Lua from C++ is slow): Profile first. Note: Lua isnt zero-indexed, so the first function argument is fetched with L.ToInt(1), second argument with L.ToInt(2). I'm a happy user of this space myself with the pet projects I develop in my free time. 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. laura lehn - via Google, I highly recommend Mayflower. 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. its number of parameters. 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. If you think that your game became slow because of Lua code, profile first before rewriting it in C++. For instance, if we have a function like. What should I do to return a large text built from numerous smaller elements? I tried to start learning Lua and immediately hit the wall after the "hello, world" part and all I got afterward are "script error". 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. I was wondering if there is a way to improve the performance. E.g. ), The disadvantage of course is that bugfixes in modules like Redirect don't get passed on. --SocietyBox (talk) 02:26, 20 January 2014 (UTC). Godoc: http://godoc.org/github.com/yuin/gopher-lua, All code in the post can be found at http://github.com/otm/embedding-lua-in-go. They have lots of options for moving. 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. The sandbox Wiki code {{Special:AllPages|namespace=666}} {{CURRENTTIMESTAMP}} returns a timestamp that changes each time the page is reloaded, because caching is disabled. I think it's worth checking back about how far we can go toward an ideal bare {{#invoke:SomeName}} format, since the extra parameter is only a nuisance/confusion to many non-Lua users. A tag already exists with the provided branch name. Hence, for Lua, the alternative is to pass fewer parameters, but as strings of choices delimited by separator characters within each string. 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. :) Wnt (talk) 08:16, 20 November 2013 (UTC), Can Lua take the contents of a Wiki page, and reprocess it? 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. Where I see this is commonly done is in the templates which return links to the archives of talk pages. For instance, consider the following function, to increment a global counter. This function has 1 as its default argument; that is, the call incCount (), without arguments, increments count by one. When you call incCount () , Lua first initializes n with nil ; the or results in its second operand; and as a result Lua assigns a default 1 to n . Thank you!--QuimGil (talk) 07:52, 21 June 2013 (UTC). --Rotpunkt (talk) 13:50, 9 January 2014 (UTC), mediawikiwiki:Extension talk:Scribunto/Lua reference manual #Example for string.format? Anomie 03:36, 1 November 2013 (UTC), User:Wnt and I have had a little disagreement over the type parameter of the {{lua}} template. You choose what Lua code can and cant do. I didn't use Special:ExpandTemplates, though - I really did just forget my curly braces. Local declaration of (built-in) Lua functions to reduce Snipre (talk) 07:52, 31 October 2013 (UTC), Is there a LUA method for '#ifexist' that doesn't generate false incoming links? Lua Performance Tips What to write in C++: collision detection, path finding, physics, renderer and other things that are performance critical. 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)." Easy to start using, the interface is user friendly and feels similar to C++ standard library. You can call a function with a number of arguments different from That is partly about performance but mostly about engine architecture. :P Anyway, I have taken that idea and added some parameter checking and some documentation, and called it Module:User:Mr. Stradivarius/PrefixIndex. 1 Answer Sorted by: 3 I would generally recommend to avoid making high volume calls into Lua. OUR MISSION. 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. An expression like o:foo(x) Then, see if you really need to move this code (or parts of it) to C++. 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). Lua Its minimalistic, but requires a lot of boilerplate and manual error-checking. 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. NeoVim, which uses Lua scripts for user script code. Fantastic help. Can templates, MediaWiki pages or parser functions be called from Lua? -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). Calling Lua code is done through L.CallByParam, which takes a parameters object, P, and arguments as variadic parameters. The simplest way to time some Lua code is to use the time command with the resty command. 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. Objects implementing this interface are LNilType, LBool, LNumber, LString, LFunction, LUserData, LState, LTable, and LChannel. How do I fix this? Of course, the specific delay depends on server load, but follows the general exponential slowdown formula, where 7,000 parameters is far slower than a linear extension of 7000/6000 or 17% slower, and runs closer to 47 seconds (+70% slower) rather than 27+17%=31.6 seconds. It uses heavy meta-programming to get things done. Johnuniq (talk) 09:37, 7 October 2013 (UTC). Will your logo be here as well?. Debresser (talk) 10:57, 8 December 2013 (UTC), Is the "Wikipedia namespaces" infobox necessary top right? Servicing Stanislaus, San Joaquin and Merced Counties, 2209 Fairview Drive Suite A Ceres, CA 95307. Link/Create testcases link for Module pages. but this fact has no relevance to Lua programmers. 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. Most of the time, you only need one Lua state (lua_State in Lua C API and sol::state in sol2) for everything. 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. In the example bellow sayHello function is first defined, and then called in the second call to DoString. 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 The parameters object takes three important parameters: Fn - the lua.LFunction to call Nret - The number of returned values Protect - If protect is true an error is returned, otherwise a panic will occur. Now the tab "Modules" does not show all modules, and does not have a 'next page' link. Everyone took really good care of our things. Mr. Stradivarius talk 12:54, 10 July 2013 (UTC), We have {{WikiProject Lua/header}} that does the header tabs (I started). If needed, custom metadata can safely be written to the metadata table; it is unique for each key and will persist for the duration of the load() call. 1 time resty -e '' We can see theres overhead of about 11 milliseconds on this machine. The Lua version has some differences from the current template, so I would like to get others' comments before making the switch. You can do procedural, functional, OO programming. Needs study to guarantee correctness! The body of the compiled Lua function consists of a series of function calls to the helper functions, one per instruction. Or is it something else? 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. with nil arguments removed.
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