= There are still a few things I'm not sure about, though. My own modules populate only the pre-alpha and alpha categories, but there are some here which I know have reached the other levels. Otherwise empty string. The typecheck function could also store away the type info for later introspection. 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 Lua doesnt impose one style of writing code on you. This was possible because the wikimarkup language was very intuitive, and easy to understand even for the layman. 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. Of course, you can check for this files existence and handle errors appropriately (e.g. Ive written many articles about using Lua with C++ on my old blog many years ago. What do people think? In our C++ file, we need to define the consoleLog function that it will receive from JavaScript. 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. WebWhen iterating a table, the function overhead from ipairs does not justify it's use. Felicia Hagler - via Google, In the middle of a big move and so far Jay Casey has been immensely helpful to us with all the details! may be relevant to this problem. We really ought to decide, flip a coin, something so we get this sort of stuff to a predictable spot. Technical 13 (talk) 12:12, 9 May 2013 (UTC). 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 It Is Me Here t / c 15:08, 3 September 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. 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. 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 ! !) 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. Now you dont need to ship this init.lua with your binary and life becomes easier. (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. I don't know, but with some of these things being transcluded on every page in the wiki, and having elaborate powers to write anything they can slip by the interface, we should be wary of security holes, and the first step is to know quickly and certainly which are a unit, I think. After the function call, And to fetch an argument without conversion the L.Get(n int) function can be used. Note: Lua isnt zero-indexed, so the first function argument is fetched with L.ToInt(1), second argument with L.ToInt(2). You can do procedural, functional, OO programming. Ultimately MediaWiki should issue another tutorial for Wikipedians (without prior knowledge of C and Lua) due to the differences from standard Lua. 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. ?0" here but useful if omit above. See discussion at Village Pump (policy)#Protection and management of scripts?. There is no reason to do it for functions which are already 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. Wnt (talk) 15:52, 22 January 2014 (UTC), Wikipedia:Lua/To do, a page you substantially contributed to, has been nominated for deletion. 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. For optional arguments the L.Opt(n int, default T) functions can be used. Can someone make a nice SpecialPages adjustment? Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. its hard to know if what youre passing to Lua will be copied or passed by a reference). Lua is written in ANSI C, so it can compile almost everywhere. but this fact has no relevance to Lua programmers. Because it makes it much easier to track dependencies between various script files and makes them load each other when theyre needed. For example, I might want to process the posts on a talk page, and add some extra formatting. Please Automatic transclusion of protection templates was added. At Module:DisplayLuaTableContents I see numerous loops as, , but I learned that strings are immutable and hence this assignment is rather costly. (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? Needs study to guarantee correctness! When calling a function, Hex (? With those it's not entirely clear if they are meant to go together or not. Or is it something else? Hi, is there a way to instruct string.format to not produce trailing zeros with decimal notation? Even if you do, with LuaJIT youll be able to achieve C/C++ level performance. lua.LVAsString(v LValue) - Converts LString and LNumber to string. or subroutine in other languages) 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). 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). Is this the right place for Lua programming queries? I think that this is less effective than it could be, however. --Iantresman (talk) 13:14, 8 December 2013 (UTC). --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? n For example, check Special:WhatLinksHere/3000 United States Census. Prompt and friendly service as well! --HectorMoffet (talk) 11:05, 29 December 2013 (UTC). What to write in C++: collision detection, path finding, physics, renderer and other things that are performance critical. 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). Page content can be retrieved with the getContent () method of the title object. 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? 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). 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. Throughout the post L will denote a pointer to lua.LState. Does mw.ustring.byteoffset work correctly with negative offsets? 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. 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. In brief, the categories I set up were pre-alpha, alpha, beta, release, and protected. The function signature must match what you passed in. Also, your feedback here about the best way to organize the data is also welcome. Can they be rewritten in Lua, perhaps? There was a problem preparing your codespace, please try again. There are some practical functions to convert and check lua.LValue objects. ), The disadvantage of course is that bugfixes in modules like Redirect don't get passed on. I bypassed the most serious problem, but for some reason the method is generating incoming links to nonexisting articles. The fact that even an IP user may edit the module namespace suggests that it must be really stable and secure. See a simple example of how to build Lua with CMake and use it with sol2 here. 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. You can download the latest release manually and include it in your project, or you can install it in your project directory through Luvit's package manager Lit, using the install command. For example, Module:Navbar contains the code: In what case would frame not be equal to mw.getCurrentFrame()? Is there a way to obtain a list (array) of all pages with a prefix (e.g. (and object-oriented programming) in more detail. All rights reserved. : Overusing them makes code harder to understand because now you need to make sure that the object youre are pointing to doesnt change unexpectedly. 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. This is a matter of implementation of the compiler or runtime (and its options) and cannot be said with any certainty. Integrating it with CMake is somewhat trickier. Lua has eight basic types: nil (undefined) boolean (boolean) number (numeric) string (string) 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. . WebTo call a Lua funcion, we first push the function onto the stack. its number of parameters. (At least script error should be shown when print function is detected.) Snipre (talk) 07:52, 31 October 2013 (UTC), Is there a LUA method for '#ifexist' that doesn't generate false incoming links? 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. Isnt it great? The sandbox Wiki code {{Special:AllPages|namespace=666}} {{CURRENTTIMESTAMP}} returns a timestamp that changes each time the page is reloaded, because caching is disabled. Is this a problem in my module or in Scribunto? 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. ]], "jo")' But there is a catch. These snippets of Python and Lua are roughly equivalent. Lua adjusts the number of arguments to the number of parameters, is to create and maintain customer confidence with our services and communication. 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. Given an instance myqobject of this class, a Lua program can emit signal mysignal as follows -Wikid77 (talk) 19:29, 22 March 2013 (UTC), When moving a module there is no redirect left behind and existing invocations should be fixed. Frietjes (talk) 16:17, 30 October 2013 (UTC). 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 . Does someone have an idea how to code this feature? Its much easier to test if something is non-nil or has a specific type/fields in Lua than in C++. This came up over at Template talk:Historical populations. Your life will be easier if you have a small C/C++ API. 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. Its neat. -Wikid77 (talk) 12:07, 24 March 2013 (UTC). Incnis Mrsi (talk) 11:59, 2 July 2013 (UTC), Hi, your feedback is welcome at Bug 50329 - We need a common repository for Scribunto modules and templates. 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. It can do everything youd ever want from Lua and even more. 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. This is not a tutorial or step-by-step guide. If you only want to call some C/C++ functions from Lua (or some small Lua functions from C/C++) - use Lua C API. Casey Moving Systems is family owned and has been servicing Northern California for over 25 years. And finally, see what LVE and PICO-8 do. Theyre mostly written in C/C++ and only expose a bunch of Lua functions/tables to the user. Johnuniq (talk) 06:53, 11 October 2013 (UTC), Doesn't Wikipedia's version of Lua allow the GetURL function (or equivalent)? I am a repeat customer and have had two good experiences with them. At least one such template will be beyond the 500 EPFs/page limit in 2015. John Victor - via Google, Very nice owner, extremely helpful and understanding What am I doing wrong? It relies on Module:Sandbox/QuimGil/Flagicon, which provides the logics, and Module:Sandbox/QuimGil/FlagTranslations, where the flags data is stored. 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. For instance, all library functions are written in C; 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? Since Lua has lexical scope at the block level rather than the function level, this works similarly to the way Python calls __exit__. Otherwise false. initialized with the actual arguments given in the function call. 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. 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. 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. There is still lots of work to do of course, But it's a start TheDJ (talk contribs) 22:18, 18 March 2013 (UTC). Is there a way for a loadData table to contain these keys? Will your logo be here as well?. ) The syntax of the template sends another template as parameter. laura lehn - via Google, I highly recommend Mayflower. itch.io was written with it and it compiles to vanilla Lua. Exposing Go functions to Lua is essential to create custom a custom API. The simplest language I know. ), You dont need a specialized IDE or tools to write Lua comfortably. There are a number of To(n int) functions available. A cross between resources, documentation, and useful links. 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 Learn more. 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. 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. -- Sameboat - (talk) 04:26, 19 March 2013 (UTC). 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. Formula: Servicing Northern California For Over 25 Years, Select The Service Your Interested InDocument ShreddingRecords ManagementPortable StorageMoving ServicesSelf StorageOffice MovingMoving Supplies. WebLua programs can emit signals using the function call syntax. How you divide up your code among different Then, executing script.lua would resullt in an error: SomeClass is nil. I'm a happy user of this space myself with the pet projects I develop in my free time. Toohool (talk) 18:13, 15 March 2013 (UTC). Download the official Lua source code here: https://www.lua.org/download.html.
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