I was wondering if there is a way to improve the performance. I measured the overhead of direct and virtual C++ function calls on the Xenon PowerPC some time ago. A tag already exists with the provided branch name. All rights reserved. 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 would use them again if needed. --Aftab1995 (talk) 15:50, 23 May 2013 (UTC), I'm very happy to announce that Template:FlagiconLua has reached feature parity with Template:Flagicon! It is superfluous if you only call the function once within the scope of the local variable, but that is pretty rare. The first question, of course, is whether we should require() at all. 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. Using the L.CheckTypes function equate to checking the type manually and then calling L.TypeError(n int, message string) if there is an error. You can call a function with a number of arguments different from Mr. Stradivarius talk 01:15, 29 October 2013 (UTC), How well does Scribunto defend itself against DoS, or possibly XSS, but especially DoS as we are dealing with a Turing-complete language? Any suggestion on how to receive this parameter template as a table rather than a substituted string? WebWe can disable all the type checking by switching a single variable, and no added overhead would remain when the functions are executed (though there is some slight added overhead when the functions are built). After your basic game engine is implemented, start with writing new code in Lua. Yes, you can replace built-in functions because they are simply functions accessed from global variables. The downside is it will incur a small performance impact every time a new page of callframes is allocated. 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/. 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. Our compilation still gets rid of the run-time Village Pump (policy)#Protection and management of scripts? They have lots of options for moving. There are still a few things I'm not sure about, though. Its easy to integrate Lua scripts into C/C++ projects. There was a problem preparing your codespace, please try again. I used their packing and moving service the first time and the second time I packed everything and they moved it. They are iteration functions, so they add the overhead of a function call to each loop iteration. The problem with 3rd party bindings is that they usually tend to get unmaintained or only support a specific version of the library. This was possible because the wikimarkup language was very intuitive, and easy to understand even for the layman. Do I need to use %f and remove the trailing zeros with string.match or string.gsub? You're looking for performance in the wrong place. The problem with function calls is not that they cost much. There is another problem. Function c 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. Then, see if you really need to move this code (or parts of it) to C++. Calls the concat function with the arguments Go and Lua and prints the resulting string to stdout. New versions come out once in a while, but you can comfortably stay on Lua 5.2 not loose much. 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). You can do procedural, functional, OO programming. Youre unlikely to run into performance issues, unless youre making a AA/AAA game or a complex simulation program. FT2(Talk|email) 02:07, 20 March 2013 (UTC), I found this guide for learning how to code Lua, may be of help or use www.lua.org/pil/contents.html#P1, I feel like I must have reinvented the wheel here, but I copied Template:Tlx to Template:Mlx with minor modifications, so we can type, and get {{#invoke:ConvertNumeric|decToHex|99 33}}, It would be good if someone could look this over for any flaws before it gets cascade-protected by something. I would generally recommend to avoid making high volume calls into Lua. 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. 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. by displaying a message box/writing to a log), but if your init.lua is not meant to be modified externally, maybe you can do it like this? The messages for /doc inclusion are currently added as contentlanguage, where really only their parameter should be included as such. The function signature must match what you passed in. This first edition was written for Lua 5.0. Otherwise true. 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. Frietjes (talk) 16:17, 30 October 2013 (UTC). 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. Objects implementing this interface are LNilType, LBool, LNumber, LString, LFunction, LUserData, LState, LTable, and LChannel. Best Mr. Stradivarius talk 10:42, 27 March 2013 (UTC), You've got it pretty much right. Please take a look at Module:RepeatString and Template talk:Repeat and see what you think. 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? 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. If you need a debugger, I recommend checking out. Mr. Stradivarius talk 23:06, 1 January 2014 (UTC); Page moved without redirect. Formula: 1 Answer Sorted by: 3 I would generally recommend to avoid making high volume calls into Lua. Please don't take those *personal* suggestions as a criticism to Wikipedia:Lua. Vanilla Lua, the latest version, otherwise. Ultimately MediaWiki should issue another tutorial for Wikipedians (without prior knowledge of C and Lua) due to the differences from standard Lua. Otherwise empty string. 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. 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). I would have been able to continue contributing to these and other interesting templates. You can even create small domain specific languages thanks to Luas syntax sugar. How you divide up your code among different 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. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. I see that I can access Mediawiki libraries as simple as "mw.stat", are modules on Wikipedia accessible as easily? Still, there are a lot of options available maybe someone can think of something? NeoVim, which uses Lua scripts for user script code. Its stable. 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. Hence, passing 2,000 parameters runs 3 seconds, 4,000 parameters runs 13 seconds, or 6,000 parameters run 27 seconds. Johnuniq (talk) 09:37, 7 October 2013 (UTC). 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)." At Module:DisplayLuaTableContents I see numerous loops as, , but I learned that strings are immutable and hence this assignment is rather costly. An expression like o:foo(x) {{. For example like: frame.args.row1. Is this the right place for Lua programming queries? I very much regret that. Technical 13 (talk) 12:12, 9 May 2013 (UTC). Given that each {{#ifexist:}} is an expensive parser function (EPF), these templates can consume an excessive number of EPFs. Note: Lua isnt zero-indexed, so the first function argument is fetched with L.ToInt(1), second argument with L.ToInt(2). 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 might also find Moonscript interesting. A language variable can contain values of any type. Is a module supposed to do something clever in order to output tags? I've taken some steps to bring it partially in line with our Template documentation system. Also explains why the uselang=qqq hack doesn't work to show the scribunto messages. as it does in a multiple assignment: WebLua programs can emit signals using the function call syntax. the colon operator. 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. Calling the LValue.Type() returns the corresponding LValueType. If that is not possible: Please suggest an alternative method to implement it. 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. 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. Greetings Stephan Kulla (talk) 15:54, 19 May 2013 (UTC), (Sorry for writing here. This bytecode is converted into LLVM IR and then fed into Deegen, which can transform the functions to do tail calls correctly, use the GHC calling conventions, and a 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 Can Lua scripts access the username of the logged in user? See http://godoc.org/github.com/yuin/gopher-lua#LTable for the LTable Go API. 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. With your own bindings, you can control what version you use and how the exposed API looks in Lua. 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). Can they be rewritten in Lua, perhaps? Iterative multi-file loader, used to load all Lua modules in a directory and return them as one table. Can templates, MediaWiki pages or parser functions be called from Lua? At the moment, we have three patterns in naming a module sandbox page: I suggest that is one too much. 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). A fixed size callstack has the highest performance and has a fixed memory overhead. 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. Dealing with C++ objects in Lua is much harder than dealing with native types. 1 time resty -e 'ngx.re.find ("hello, world. ?0" here but useful if omit above. lua.LVAsString(v LValue) - Converts LString and LNumber to string. A Go function should implement the LGFunction type to be callable from Lua. You can easily create a Lua state which wont have any functions from the standard library (I/O, coroutines, tables etc. how can i do this (on which module, i find this Category for translation). Its minimalistic, but requires a lot of boilerplate and manual error-checking. The gopher-lua library operates on a interface called LValue. Snipre (talk) 07:52, 31 October 2013 (UTC), Is there a LUA method for '#ifexist' that doesn't generate false incoming links? 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. (and object-oriented programming) in more detail. Writing the code in it feels like writing pseudocode/prototyping. However, sometimes that is just not enough and an embedded language can be the solution. WebIt's more terse, though at the expense of the function call overhead. These functions does not throw errors, but will return Go default values if conversion is not possible. extra parameters get nil. I didn't use Special:ExpandTemplates, though - I really did just forget my curly braces. The documentation toolbox does not yet know about Module testcases (though the editnotice 'sort of' does). 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. 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"? We could also use the template to automatically add Category:Lua-based templates to keep track of converted templates more easily. 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.
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