lua function call overhead

If that is not possible: Please suggest an alternative method to implement it. 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. This code is OK (calling C++ from Lua is cheap): This code is not that good (calling Lua from C++ is slow): Profile first. 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. You can divide up your code into separate functions. -- Gets args.rowtype1, args.rowtype2, etc. 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. If you'd like to make a request, please do that too! 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. It uses heavy meta-programming to get things done. 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. is just another way to write o.foo(o, x), What I'm trying to do is much more complicated, see Module:Convert/makeunits, but is the same issue. 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? Hence, for Lua, the alternative is to pass fewer parameters, but as strings of choices delimited by separator characters within each string. 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). Lua is a language with implicitly dynamic data types. -Wikid77 (talk) 12:07, 24 March 2013 (UTC). 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. Preceding unsigned comment added by Ryn78 (talk contribs) 03:27, 13 October 2013 (UTC), Is it possible for a module to invoke another module? 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. Thank you!--QuimGil (talk) 07:52, 21 June 2013 (UTC). If nothing happens, download GitHub Desktop and try again. NeoVim, which uses Lua scripts for user script code. You can easily create a Lua state which wont have any functions from the standard library (I/O, coroutines, tables etc. 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. ), The disadvantage of course is that bugfixes in modules like Redirect don't get passed on. For instance, all library functions are written in C; 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. --Iantresman (talk) 13:14, 8 December 2013 (UTC). 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. The syntax of the template sends another template as parameter. Any suggestion on how to receive this parameter template as a table rather than a substituted string? I've created a new request page for Lua scripts at Wikipedia:Lua requests. Its easy to integrate Lua scripts into C/C++ projects. WebYou can call a template from a Lua module using frame:expandTemplate. 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! I'm currently using the following function to get template arguments. 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. To be sure, this is the strip marker for a current time function, but I'm thinking this is either a bug or a feature, and we should figure out which! It can do everything youd ever want from Lua and even more. 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++. Learn more. 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). Casey Moving Systems is family owned and has been servicing Northern California for over 25 years. The overhead of a virtual function call was 13.2 nanoseconds, or 42 clock cycles, compared to inline. but this fact has no relevance to Lua programmers. I am trying to implement {{Horizontal timeline}} as a module. To get the perf bit You can write entire games in Lua without ever touching C/C++. This was possible because the wikimarkup language was very intuitive, and easy to understand even for the layman. --Iantresman (talk) 00:06, 12 December 2013 (UTC). how can i do this (on which module, i find this Category for translation). --Rotpunkt (talk) 12:35, 1 May 2013 (UTC), Hello, I'm wondering if there is currently a module that counts elements on a page. There is no reason to do it for functions which are already 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. If anyone could help me to work this out I'd be very grateful. 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. lua.LVIsFalse(v LValue) - Returns true if nil or false. Because it makes it much easier to track dependencies between various script files and makes them load each other when theyre needed. Johnuniq (talk) 06:53, 11 October 2013 (UTC), Doesn't Wikipedia's version of Lua allow the GetURL function (or equivalent)? ", [ [\w+\. 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. Lua adjusts the number of arguments to the number of parameters, The function signature must match what you passed in. Page contents not supported in other languages. Right now I'm putting ratings on the documentation subpages, which I think is what someone suggested before at one point for categories. Can templates, MediaWiki pages or parser functions be called from Lua? 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. :P Anyway, I have taken that idea and added some parameter checking and some documentation, and called it Module:User:Mr. Stradivarius/PrefixIndex. --SocietyBox (talk) 02:26, 20 January 2014 (UTC). I didn't use Special:ExpandTemplates, though - I really did just forget my curly braces. That's a bit of boilerplate code that I've been using in all the modules I write. 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 ! Objects implementing this interface are LNilType, LBool, LNumber, LString, LFunction, LUserData, LState, LTable, and LChannel. there is no difference between functions defined Running the Go code will yield: To run a Lua file, instead of a string, call lua.DoFile, DoFile and DoString can be called several times, and thus it can be utilized to expose Lua function. I'd like to include some of the functionality of module:Page in my module, without having to reinvent the wheel. 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. after imported i find error in article with this Category:Pages with script errors. Hopefully this will be semi-useful again. 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). Automatic insertion of the green 'chrome' of our template documentation. 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 Providing global relocations solutions, storage and warehousing platforms and destruction plans. The LTable type can be used for emulating namespaces and classes. = Wnt (talk) 15:52, 22 January 2014 (UTC), Wikipedia:Lua/To do, a page you substantially contributed to, has been nominated for deletion. Do I need to use %f and remove the trailing zeros with string.match or string.gsub? A language variable can contain values of any type. Calling Lua code is done through L.CallByParam, which takes a parameters object, P, and arguments as variadic parameters. You signed in with another tab or window. :) Wnt (talk) 08:16, 20 November 2013 (UTC), Can Lua take the contents of a Wiki page, and reprocess it? Makyen, does that look something like what you wanted? as it does in a multiple assignment: Theyre mostly written in C/C++ and only expose a bunch of Lua functions/tables to the user. 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. its number of parameters. Ive used LuaDists CMake build scripts for Lua for many years, but LuaDist authors have stopped supporting newer Lua versions. Gut feeling is usually wrong. After your basic game engine is implemented, start with writing new code in Lua. It stays global and doesnt get collected by a GC until it has been set to nil. 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). Writing code like this will become better with new #embed directive in future C/C++ versions, e.g. How you divide up your code among different It doesnt have many gotchas. now i wanted to translate Category:Pages with script errors in bn language. WebThe Redis Lua execution context always provides a singleton instance of an object named redis . With a clear upsream in a central place like mediawiki.org then en.wiki and other Wikimedia projects could work better on local support and whatever is specific to their communities. 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. {\displaystyle d=3^{(n/2000)}.} The docs are fantastic too. The same can be said about making your program expandable with plugins. 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. -DePiep (talk) 23:30, 19 July 2013 (UTC), Do Module:WikiLink and voy:ru::Wikilinks effectively aim to do the same thing? 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. Many 3rd party Lua libraries usually work with Lua 5.2/5.3/5.4. Lua has eight basic types: nil (undefined) boolean (boolean) number (numeric) string (string) And finally, see what LVE and PICO-8 do. !) 16:49, 3 April 2013 (UTC), I've created five categories for different levels of Lua module progress: since each explains the others, Category:Modules in alpha should be sufficient. At least one such template will be beyond the 500 EPFs/page limit in 2015. After the function call, Mr. Stradivarius talk 14:16, 4 November 2013 (UTC). Functions used by a Lua program can be defined both in Lua and "factorial: argument must be a number >= 0", -- likely something like 1=foo=bar, we need to do it as a named arg. Ultimately MediaWiki should issue another tutorial for Wikipedians (without prior knowledge of C and Lua) due to the differences from standard Lua. For instance, if we have a function like. These functions does not throw errors, but will return Go default values if conversion is not possible. Just some of our awesome clients tat we had pleasure to work with. also, if someone already wrote a module that does the same thing, let me know and I will have this one deleted. If nothing happens, download Xcode and try again. Clearly it's worth thinking about ways to reduce this impact as much as possible. 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. Now you dont need to ship this init.lua with your binary and life becomes easier. 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 was just trying to return those hex tables via loadData and seem to have run into a nasty surprise. Hex (? laura lehn - via Google, I highly recommend Mayflower. If you notice that your C++ function has a huge overhead because of Lua calls, consider using this pattern: // in C++ sol::table t = lua.create_table (); for (int i = 0; i < 1000; i++) { // do stuff in C++, push data to Lua table occasionally } luaFunc (t); -- in Lua function someFunc (t) for k,v in pairs (t) do -- do stuff end end 5. Hence, passing 2,000 parameters runs 3 seconds, 4,000 parameters runs 13 seconds, or 6,000 parameters run 27 seconds. ?0" here but useful if omit above. Isnt it great? Can do a lot of automagic and save you from writing tons of boilerplate code, which you need to do if you use other bindings or Lua C API. Servicing Stanislaus, San Joaquin and Merced Counties, 2209 Fairview Drive Suite A Ceres, CA 95307. That way it would be obvious straight away which templates have been converted, and would help advertise the fact that we have this neat new programming language available and that we need people to convert existing templates over. 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'});. How do I fix this? Text formatting (bold, italics) breaks when the ''/''' tags are not closed for each argument. That overhead might be removed if we made save/restore a built-in operation in Lua. In the example bellow sayHello function is first defined, and then called in the second call to DoString. You can do procedural, functional, OO programming. string.format('%f %f %f', 0.00001, 1.2, 3) => 0.000010 1.200000 3.000000, string.format('%g %g %g', 0.00001, 1.2, 3) => 1e-05 1.2 3, This page was last edited on 4 February 2023, at 15:13. Most of the time, you only need one Lua state (lua_State in Lua C API and sol::state in sol2) for everything. 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. Anyone interested in testing templates may want to try Module:Convert/tester which allows hundreds of tests to be easily defined. thank you. Is there a way for a loadData table to contain these keys? If you create a local object inside the coroutine and store the reference to it in C++. Automatic transclusion of protection templates was added. I tried to start learning Lua and immediately hit the wall after the "hello, world" part and all I got afterward are "script error". The fact that even an IP user may edit the module namespace suggests that it must be really stable and secure.

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