= Then we call the function with lua_call (). One of the most versatile and used data structures in Lua is LTable (actually it is the only one). Throughout the post L will denote a pointer to lua.LState. - basically everything else that doesnt interact with low-level OS APIs much. P:S Creating separate module for template2 in above example is not feasible because I am trying to reduce the number of template substitution and writing separate modules would defeat the purpose.--Jayarathina (talk) 05:20, 24 December 2013 (UTC). 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. Relevant to Lua, userscripts, and user scripting generally. 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. Comments appreciated. Integrating it with CMake is somewhat trickier. 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). 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. To learn Lua, read Programming in Lua by Roberto Ierusalimschy. Please take a look at Module:RepeatString and Template talk:Repeat and see what you think. ( A language variable can contain values of any type. So tonight I put together Module:Unsubst, which can be used to do the same thing without all the limitations of {{unsubst}}. This was possible because the wikimarkup language was very intuitive, and easy to understand even for the layman. Functions used by a Lua program can be defined both in Lua and 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'});. This code is OK (calling C++ from Lua is cheap): This code is not that good (calling Lua from C++ is slow): Profile first. The body of the compiled Lua function consists of a series of function calls to the helper functions, one per instruction. 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 ! 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. The tutorial I actually want is how a template with parser functions translate into a Lua module with explanation of what syntax equal what variable/function or whatever. Automatic insertion of the green 'chrome' of our template documentation. (At least script error should be shown when print function is detected.) A cross between resources, documentation, and useful links. -DePiep (talk) 11:51, 22 March 2013 (UTC). 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. 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. -DePiep (talk) 23:30, 19 July 2013 (UTC), Do Module:WikiLink and voy:ru::Wikilinks effectively aim to do the same thing? Johnuniq (talk) 22:58, 10 January 2014 (UTC). WebLua Functions - A function is a group of statements that together perform a task. DePiep (talk) 23:55, 21 May 2015 (UTC). (and object-oriented programming) in more detail. In our C++ file, we need to define the consoleLog function that it will receive from JavaScript. -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). Functions can both carry out a specific task Lua is written in ANSI C, so it can compile almost everywhere. It may sound like asking to be babysat or spoon-fed, but I'm totally stuck. The functions in question had a single parame its number of parameters. To get the perf bit out of the way: the bridging code between C++/Lua has overhead compared to just calling Lua from Lua or calling C++ from C++. Still, there are a lot of options available maybe someone can think of something? The gopher-lua library operates on a interface called LValue. Text formatting (bold, italics) breaks when the ''/''' tags are not closed for each argument. At least one such template will be beyond the 500 EPFs/page limit in 2015. Right now I'm putting ratings on the documentation subpages, which I think is what someone suggested before at one point for categories. Otherwise true. Hopefully this will be semi-useful again. Work fast with our official CLI. Makyen (talk) 05:58, 1 January 2014 (UTC), That makes sense. And be especially careful when using coroutines. WebIt's more terse, though at the expense of the function call overhead. lua.LVAsBool(v LValue) - Convert to bool, nil and false becomes false. 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. Hence, for Lua, the alternative is to pass fewer parameters, but as strings of choices delimited by separator characters within each string. The parameters object takes three important parameters: The following code defines a concat function in Lua. after imported i find error in article with this Category:Pages with script errors. For example, check Special:WhatLinksHere/3000 United States Census. 1 time resty -e '' We can see theres overhead of about 11 milliseconds on this machine. Dealing with C++ objects in Lua is much harder than dealing with native types. 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. OUR MISSION. I was just trying to return those hex tables via loadData and seem to have run into a nasty surprise. laura lehn - via Google, I highly recommend Mayflower. 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. Is this a problem in my module or in Scribunto? -- Don't need the "%. All values in Lua can be stored in variables, used as arguments when calling functions, and returned as the result of their execution. These timings are likely different on different processor Its easy to integrate Lua scripts into C/C++ projects. That would only apply to your contributions though, not to later modifications made by other editors. For instance, if we have a function like. Since Lua has lexical scope at the block level rather than the function level, this works similarly to the way Python calls __exit__. 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). WebTo call a Lua funcion, we first push the function onto the stack. or subroutine in other languages) Prompt and friendly service as well! You couldn't keep track of your old experiments, and my experience is that yes, I. I used their packing and moving service the first time and the second time I packed everything and they moved it. Everyone took really good care of our things. Thank you for your attention!--Qgil (talk) 21:16, 2 July 2013 (UTC), I created Module:Testcase table, and it seems to work pretty well (see the current transclusions). The same can be said about making your program expandable with plugins. I see that I can access Mediawiki libraries as simple as "mw.stat", are modules on Wikipedia accessible as easily? I'm a rookie! 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. Its a road map for learning Lua and my advice for how to integrate it with C/C++ code. The resty command itself has a startup and exiting overhead. Mr. Stradivarius talk 14:16, 4 November 2013 (UTC). Ive used LuaDists CMake build scripts for Lua for many years, but LuaDist authors have stopped supporting newer Lua versions. The function signature must match what you passed in. Have there been any major incidents yet? Our areas of expertise include Commercial Moving Services, Warehousing, Document Shredding and Storage Solutions. L.DoString runs the Lua code in the VM. Unfortunately, I have not yet been able to think of a way to mix this logic to get what I want, namely a way to control whether results are updated daily or weekly, etc., because I haven't thought of a way by which the logic of whether time has passed will always be evaluated but the logic of the page content will not be, unless the time has come, at which point the caching should be updated on that page. There are still a few things I'm not sure about, though. mw.site.currentVersion, mw.site.scriptPath, etc etc. An expression like o:foo(x) This is not a tutorial or step-by-step guide. See the demos and more details at WikiProject Flag Template. We could also use the template to automatically add Category:Lua-based templates to keep track of converted templates more easily. 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. Similarly to the previous advice, when defining classes (e.g. If you need a debugger, I recommend checking out. The function is followed by the arguments, in order. 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. 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). They both open a file, read one line, and close it, or do nothing if there was some error opening the file. Servicing Northern California For Over 25 Years, Select The Service Your Interested InDocument ShreddingRecords ManagementPortable StorageMoving ServicesSelf StorageOffice MovingMoving Supplies. The simplest way to time some Lua code is to use the time command with the resty command. Lua is a language with implicitly dynamic data types. 2015 Nils Lagerkvist. The message from MediaWiki:Movepagetext-noredirectfixer should warn about this, perhaps a warning like MediaWiki:Moveuserpage-warning. In the first case, we use a function call as a statement; 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. WebLua programs can emit signals using the function call syntax. 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 (~~~~). Please let me know your thoughts over at Template talk:Pagetype#Module:Pagetype. In Lua, all arrays are 1-indexed, however t[0] is still valid but that would result in the lenght of the array to be off-by-one. in C (or in any other language used by the host application). The overhead of a virtual function call was 13.2 nanoseconds, or 42 clock cycles, compared to inline. 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. See the explanation on how to do concurrency in Lua in sol2 here (especially about lua_xmove and sol::main_object). 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 However, after writing up Module:Hex, which hex dumps the contents of strings, I was looking at the talk page when I noticed that the hex-dump of the contents of a strip marker (the example with UNIQ QINU) are changing every single time I hit the Talk tab or browser reload button to reload the page, even when I'm completely logged out with scripts disabled! . (what is sometimes called procedure You just compile a bunch of C files, link with the library and youre ready to go - you dont need to rewrite half of your program/game or make your build script 10 times more difficult. Cya. Your life will be easier if you have a small C/C++ API. Will your logo be here as well?. Is there a programme wizard who can help see if I've done something stupid? Because it makes it much easier to track dependencies between various script files and makes them load each other when theyre needed. You can easily print table contents with it: For example, Id recommend to avoid SDL/glfw/SFML bindings and writing them manually for the stuff you need. 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. Wnt (talk) 15:52, 22 January 2014 (UTC), Wikipedia:Lua/To do, a page you substantially contributed to, has been nominated for deletion. Best Mr. Stradivarius talk 10:42, 27 March 2013 (UTC), You've got it pretty much right. Theyre mostly written in C/C++ and only expose a bunch of Lua functions/tables to the user. First lets set up the environment and test that it works, start by install gopher-lua: Secondly lets create a minimal implementation: lua.NewState() creates our Lua VM, and it is though L (*lua.LState) we will interact with Lua in the future. Are you sure you want to create this branch? Providing global relocations solutions, storage and warehousing platforms and destruction plans. Servicing Stanislaus, San Joaquin and Merced Counties, 2209 Fairview Drive Suite A Ceres, CA 95307. The first question, of course, is whether we should require() at all. How do I fix this? 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. Frietjes (talk) 16:17, 30 October 2013 (UTC). A Go function should implement the LGFunction type to be callable from Lua. Greetings Stephan Kulla (talk) 15:54, 19 May 2013 (UTC), (Sorry for writing here. Extra arguments are thrown away; -Wikid77 (talk) 12:07, 24 March 2013 (UTC). I very much regret that. 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. 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. 2000 Does mw.ustring.byteoffset work correctly with negative offsets? And finally, see what LVE and PICO-8 do. My own modules populate only the pre-alpha and alpha categories, but there are some here which I know have reached the other levels. They have lots of options for moving. !) 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. A fixed size callstack has the highest performance and has a fixed memory overhead. to use Codespaces. This can result in slow compilation times, unreadable error messages and some interfaces are not that friendly (e.g. Installation You can download the latest release manually and include New versions come out once in a while, but you can comfortably stay on Lua 5.2 not loose much. 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 . Now you dont need to ship this init.lua with your binary and life becomes easier. How you divide up your code among different With your own bindings, you can control what version you use and how the exposed API looks in Lua. WebWhen iterating a table, the function overhead from ipairs does not justify it's use. I didn't use Special:ExpandTemplates, though - I really did just forget my curly braces. Note: Lua isnt zero-indexed, so the first function argument is fetched with L.ToInt(1), second argument with L.ToInt(2). It behaves somewhat like a stack as in [Forth] but with one element. 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. I don't think it was really a active decision. 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. Lori Baker - via Google. sol2 is a fantastic library which Ive used for many years. and expressions in Lua. Lua adjusts the number of arguments to the number of parameters, Objects implementing this interface are LNilType, LBool, LNumber, LString, LFunction, LUserData, LState, LTable, and LChannel. What to write in C++: collision detection, path finding, physics, renderer and other things that are performance critical. I've been trying to get to grips with the concept of frames, and I think I'm almost there. There is no reason to do it for functions which are already Also explains why the uselang=qqq hack doesn't work to show the scribunto messages. Currently it is misleading advising to check for double redirects. It receives a *lua.LState and returns an integer. For example (C++ functions have cpp postfix): Ask yourself: do all these functions need to be in C++? See http://godoc.org/github.com/yuin/gopher-lua#LTable for the LTable Go API. If you only want to call some C/C++ functions from Lua (or some small Lua functions from C/C++) - use Lua C API. 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. Long story short, the overhead of a direct (non-virtual) function call was approximately 5.5 nanoseconds, or 18 clock cycles, compared to an inline function call. The overhead of a virtual function call was 13.2 nanoseconds, or 42 clock cycles, compared to inline. These timings are likely different on different processor families. how can i do this (on which module, i find this Category for translation). The approach of Module:Sandbox - having every user put scripts into a common receptacle - seems unworkable. Where I see this is commonly done is in the templates which return links to the archives of talk pages. 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. Is it a good idea to deviate from the template standard of calling pages with testcases, tests for the module namespace? If you used classes as globals (which Ive seen in many tutorials and real code), you might have a script like this: Suppose that you didnt execute some_class.lua first (which defines a global SomeClass). --Iantresman (talk) 13:14, 8 December 2013 (UTC). Writing the code in it feels like writing pseudocode/prototyping. 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. Hard working, fast, and worth every penny! / He has also implemented a number of incredible little libraries which Ive used in my projects: Many other great libraries can be found via LuaRocks: https://luarocks.org/. --Iantresman (talk) 14:50, 8 December 2013 (UTC). 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. Its stable. The less data is shared between C++ and Lua, the better. Otherwise empty string. I measured the overhead of direct and virtual C++ function calls on the Xenon PowerPC some time ago. 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. thank you. (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? 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. 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. extra parameters get nil. Exposing Go functions to Lua is essential to create custom a custom API. 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? 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)." The syntax of the template sends another template as parameter. n "factorial: argument must be a number >= 0", -- likely something like 1=foo=bar, we need to do it as a named arg. that is, to call o.foo adding o as a first extra argument. Mr. Stradivarius talk 12:54, 10 July 2013 (UTC), We have {{WikiProject Lua/header}} that does the header tabs (I started). 1 time resty -e 'ngx.re.find ("hello, world. In brief, the categories I set up were pre-alpha, alpha, beta, release, and protected. 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. Then, executing script.lua would resullt in an error: SomeClass is nil. Writing code like this will become better with new #embed directive in future C/C++ versions, e.g. For example, I might want to process the posts on a talk page, and add some extra formatting. Toohool (talk) 18:13, 15 March 2013 (UTC). I was going to deploy it on Template:Year in other calendars/testcases, but in my preview it runs out of time by the time it gets to the last test. Our compilation still gets rid of the run-time Calling the LValue.Type() returns the corresponding LValueType. It can do everything youd ever want from Lua and even more. This came up over at Template talk:Historical populations. You can write entire games in Lua without ever touching C/C++. The problem with 3rd party bindings is that they usually tend to get unmaintained or only support a specific version of the library.
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