with nil arguments removed. in the second case, we use it as an expression: Lua also offers a special syntax for object-oriented calls, 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. Ive used LuaDists CMake build scripts for Lua for many years, but LuaDist authors have stopped supporting newer Lua versions. I would generally recommend to avoid making high volume calls into Lua. All rights reserved. The returned integer defines how many return values has been pushed to the Lua stack. {{. I would have been able to continue contributing to these and other interesting templates. 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. 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). 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. What I'm trying to do is much more complicated, see Module:Convert/makeunits, but is the same issue. 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. Iterative multi-file loader, used to load all Lua modules in a directory and return them as one table. Each layer of "shell templates" (to #invoke a Lua function) also increases the expansion depth by about +2 levels of the 41-level limit (shows "41/40"). 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. -DePiep (talk) 11:51, 22 March 2013 (UTC). ]], "jo")' But there is a catch. After your basic game engine is implemented, start with writing new code in Lua. It uses heavy meta-programming to get things done. 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. -- Sameboat - (talk) 04:26, 19 March 2013 (UTC). powered by Hugo For example (C++ functions have cpp postfix): Ask yourself: do all these functions need to be in C++? Calling Lua code is done through L.CallByParam, which takes a parameters object, P, and arguments as variadic parameters. WebIt's more terse, though at the expense of the function call overhead. Lua Now you dont need to ship this init.lua with your binary and life becomes easier. Cya. You might also find Moonscript interesting. Page content can be retrieved with the getContent () method of the title object. It can do everything youd ever want from Lua and even more. Wnt (talk) 15:56, 6 January 2014 (UTC). 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. 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'});. Lori Baker - via Google. 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. 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. --Iantresman (talk) 11:31, 9 December 2013 (UTC), Can modules "call" other modules? The system compares actual template output with fixed text, and is only suitable for templates and results that are reasonably short because each template and its expected result have to be in one line. Lua has eight basic types: nil (undefined) boolean (boolean) number (numeric) string (string) 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. 3 My own modules populate only the pre-alpha and alpha categories, but there are some here which I know have reached the other levels. Makyen (talk) 05:58, 1 January 2014 (UTC), That makes sense. Mr. Stradivarius talk 14:16, 4 November 2013 (UTC). And be especially careful when using coroutines. 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. 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). 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 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. 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. They are iteration functions, so they add the overhead of a function call to each loop iteration. I'd like to include some of the functionality of module:Page in my module, without having to reinvent the wheel. 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. *, 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. WebThe Redis Lua execution context always provides a singleton instance of an object named redis . A Go function should implement the LGFunction type to be callable from Lua. Johnuniq (talk) 22:58, 10 January 2014 (UTC). If nothing happens, download GitHub Desktop and try again. Its simple. The resty command itself has a startup and exiting overhead. The XLua object also has a substantial MMF Interface for directly querying and modifying game objects and state This code is OK (calling C++ from Lua is cheap): This code is not that good (calling Lua from C++ is slow): Profile first. Its much easier to test if something is non-nil or has a specific type/fields in Lua than in C++. Result #3 works correctly. The message from MediaWiki:Movepagetext-noredirectfixer should warn about this, perhaps a warning like MediaWiki:Moveuserpage-warning. 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. Calling Lua Functions - Game Dev Geek How do I fix this? Does someone have an idea how to code this feature? now i wanted to translate Category:Pages with script errors in bn language. 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 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. Should I return a sequence of hundreds of strings relying on Scribunto in concatenating it? 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. WebYou can call a template from a Lua module using frame:expandTemplate. --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. Then, see if you really need to move this code (or parts of it) to C++. In this case we will embed Lua using gopher-lua. Is these Lua performance tips still accurate? : r/lua - Reddit Currently it is misleading advising to check for double redirects. lua.LVIsFalse(v LValue) - Returns true if nil or false. . A fixed size callstack has the highest performance and has a fixed memory overhead. They have lots of options for moving. Dealing with C++ objects in Lua is much harder than dealing with native types. For example: Instead I need to output: "0.00001 1.2 3". There are a number of To(n int) functions available. I've been trying to get to grips with the concept of frames, and I think I'm almost there. Just some of our awesome clients tat we had pleasure to work with. 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. Page contents not supported in other languages. I was just trying to return those hex tables via loadData and seem to have run into a nasty surprise. Anyone interested in testing templates may want to try Module:Convert/tester which allows hundreds of tests to be easily defined. Extra arguments are thrown away; However, I found that returning mw.message.newRawMessage("{{User:Wnt/Templates/Sandbox2}}"):parse() produces a timestamp that never changes when the page invoking the module is reloaded, because the page transcluded is not checked at all. 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. I bypassed the most serious problem, but for some reason the method is generating incoming links to nonexisting articles. -Wikid77 (talk) 12:07, 24 March 2013 (UTC). There is still lots of work to do of course, But it's a start TheDJ (talk contribs) 22:18, 18 March 2013 (UTC). Its a road map for learning Lua and my advice for how to integrate it with C/C++ code. This is a matter of implementation of the compiler or runtime (and its options) and cannot be said with any certainty. And to fetch an argument without conversion the L.Get(n int) function can be used. The gopher-lua library operates on a interface called LValue. Since Lua has lexical scope at the block level rather than the function level, this works similarly to the way Python calls __exit__. New versions come out once in a while, but you can comfortably stay on Lua 5.2 not loose much. Technical 13 (talk) 12:12, 9 May 2013 (UTC). 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. 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). If nothing happens, download Xcode and try again. Thank you!--QuimGil (talk) 07:52, 21 June 2013 (UTC). or subroutine in other languages) The Lua version has some differences from the current template, so I would like to get others' comments before making the switch. Exposing Go functions to Lua is essential to create custom a custom API. That's a bit of boilerplate code that I've been using in all the modules I write. Automatic insertion of the green 'chrome' of our template documentation. 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. 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? Writing code like this will become better with new #embed directive in future C/C++ versions, e.g. Incnis Mrsi (talk) 22:46, 9 January 2014 (UTC). 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). To learn Lua, read Programming in Lua by Roberto Ierusalimschy. Most of the time, you only need one Lua state (lua_State in Lua C API and sol::state in sol2) for everything. However, sometimes that is just not enough and an embedded language can be the solution. mw.site.currentVersion, mw.site.scriptPath, etc etc. Toohool (talk) 17:18, 27 March 2013 (UTC), I have another related question. If you're unaware, {{unsubst}} (along with a few other templates) is used to make it so that entering {{subst:citation needed}} in an article results in {{Citation needed| date=November 2013}} rather than dumping all the template code into the article. [feature X] (images/feature-x.png) Multi-MC Simulation That is partly about performance but mostly about engine architecture. 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.