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How much do function calls impact performance? WebLua Functions - A function is a group of statements that together perform a task. Can someone make a nice SpecialPages adjustment? there is no difference between functions defined lua 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. Example: L.GetTop() returns the number of arguments that was used when the function was called. This is a matter of implementation of the compiler or runtime (and its options) and cannot be said with any certainty. The gopher-lua library operates on a interface called LValue. Ive used LuaDists CMake build scripts for Lua for many years, but LuaDist authors have stopped supporting newer Lua versions. sign in Anyone interested in testing templates may want to try Module:Convert/tester which allows hundreds of tests to be easily defined. I tried to start learning Lua and immediately hit the wall after the "hello, world" part and all I got afterward are "script error". to use Codespaces. or compute and return values. These functions does not throw errors, but will return Go default values if conversion is not possible. Can one call lua function that returns sevaral strings and pass them to a template? -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). Calling Lua Functions - Game Dev Geek WebYou can call a template from a Lua module using frame:expandTemplate. :P Anyway, I have taken that idea and added some parameter checking and some documentation, and called it Module:User:Mr. Stradivarius/PrefixIndex. WebBut when you create thou sands of small tables, the combined overhead can be signic ant. (what is sometimes called procedure (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? I've created a new request page for Lua scripts at Wikipedia:Lua requests. 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++. 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. Putting the following into the debug window gives the values shown: I don't need the functionI'm just asking if it has a bug. 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. 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). 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 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. If you need a debugger, I recommend checking out. Do I need to use %f and remove the trailing zeros with string.match or string.gsub? Wnt thinks that the template should use the "style" type (with a yellow background), and I think it should use the "notice" type (with a grey background). How you divide up your code among different Keep your global state to a minimum and variable scope as small as possible. Its much easier to test if something is non-nil or has a specific type/fields in Lua than in C++. 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! See discussion at Village Pump (policy)#Protection and management of scripts?. sol2 is a fantastic library which Ive used for many years. 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 (~~~~). Immediately afterward it gives you another line of codes which I have absolutely no idea where to insert it to make it functional at all. Mr. Stradivarius talk 09:47, 11 November 2013 (UTC), I've updated Wikipedia:Lua/Modules/Overview using a Lua module to generate a table from various simple cut and paste data. 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. Formula: Of course, the specific delay depends on server load, but follows the general exponential slowdown formula, where 7,000 parameters is far slower than a linear extension of 7000/6000 or 17% slower, and runs closer to 47 seconds (+70% slower) rather than 27+17%=31.6 seconds. Its simple. WebThe Lua interpreter offers two hooks for debug purposes: typedef void (*lua_CHFunction) (lua_Function func, char *file, int line); extern lua_CHFunction lua_callhook; typedef void (*lua_LHFunction) (int line); extern lua_LHFunction lua_linehook; The first one is called whenever the interpreter enters or leaves a function. -- Gets args.rowtype1, args.rowtype2, etc. The process was smooth and easy. I see that I can access Mediawiki libraries as simple as "mw.stat", are modules on Wikipedia accessible as easily? For example: Instead I need to output: "0.00001 1.2 3". and expressions in Lua. Of course, you can check for this files existence and handle errors appropriately (e.g. Is it a good idea to deviate from the template standard of calling pages with testcases, tests for the module namespace? It may sound like asking to be babysat or spoon-fed, but I'm totally stuck. Ginsuloft (talk) 13:39, 30 October 2013 (UTC), currently, in Module:Historical populations, I am using a somewhat convoluted method to access 'formatnum' which involves passing 'frame' and using 'callParserFunction'. 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. Toohool (talk) 18:13, 15 March 2013 (UTC). Iterative multi-file loader, used to load all Lua modules in a directory and return them as one table. It would be a bit odd. Most of the time, you only need one Lua state (lua_State in Lua C API and sol::state in sol2) for everything. The general method that has been used is to assume a format for the page archive name and then test for the existence of all such possible pages using {{#ifexist:}}. Needs study to guarantee correctness! 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. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Youre unlikely to run into performance issues, unless youre making a AA/AAA game or a complex simulation program. 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. 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. Mr. Stradivarius talk 23:06, 1 January 2014 (UTC); Page moved without redirect. n A tag already exists with the provided branch name. 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/. 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). The body of the compiled Lua function consists of a series of function calls to the helper functions, one per instruction. I would use them again if needed. [feature X] (images/feature-x.png) Multi-MC Simulation 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). Thats basically all youll ever need to know about Lua. Then we call the function with lua_call (). Hex (? See a simple example of how to build Lua with CMake and use it with sol2 here. 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. We have a lot of cases where related modules have the same name with "/" to indicate subpages, and some others where apparently related modules simply extend a name. I'm a happy user of this space myself with the pet projects I develop in my free time. Older versions of Lua created empty tables with some pre-all ocated slots (four, if I My own modules populate only the pre-alpha and alpha categories, but there are some here which I know have reached the other levels. Technical 13 (talk) 12:12, 9 May 2013 (UTC). if u can help me)I imported Module:Citation, Module:Citation/CS1/Configuration, Module:Citation/CS1 in bn.wikipedia. What am I doing wrong? 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). 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. 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. Should I return a sequence of hundreds of strings relying on Scribunto in concatenating it? Wnt (talk) 15:56, 6 January 2014 (UTC). If that is not possible: Please suggest an alternative method to implement it. 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. in Lua and functions defined in C. As we have seen in other examples, You can write entire games in Lua without ever touching C/C++. !) 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. That is partly about performance but mostly about engine architecture. Clearly it's worth thinking about ways to reduce this impact as much as possible. lua.CanConvToString(v LValue) - True if LString or LNumber. 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. (and object-oriented programming) in more detail. Hopefully this will be semi-useful again. On each conflict, this function will be passed the conflicted key, the current value that load() is attempting to save, the value that is currently stored in the conflicted key, and a table of metadata consisting of the following: Please note that these keys are created and updated automatically by load() and should not be altered manually. ?0" here but useful if omit above. GitHub I very much regret that. Lua 5.4 I've been trying to get to grips with the concept of frames, and I think I'm almost there. mw:Extension:Scribunto/Lua reference manual#mw.title.makeTitle, en:Module_talk:String#Replication on other wikis, http://commons.wikimedia.org/wiki/Commons:Lua/Modules, Help talk:Template#Counting items in numbered list, WT:WikiProject Templates#Counting items in numbered list, Wikipedia:Help desk#Counting items in numbered list, betawiki:MediaWiki:Scribunto-common-error-category/bn, mediawikiwiki: Extension:Scribunto/Lua reference manual #table.concat, Bug 50329 - We need a common repository for Scribunto modules and templates, Template:Year in other calendars/testcases, Module talk:Sandbox/Johnuniq/grosstonnage, Wikipedia talk:Lua style guide#CodeEditor switched to tabs, submit code to implement a ulimit-like mechanism on Windows, Special:WhatLinksHere/3000 United States Census, mw:Extension:Scribunto/Lua_reference_manual#Returning_text, Module:Sandbox/iantresman/sandbox/archive/mw.recursive, User:Iantresman/sandbox/archive/mw.recursive, Special:PrefixIndex/User:Mr. Stradivarius, Help:Lua_for_beginners#Initializing_a_table, updating some Lua modules can cause 7 million pages to be reformatted, Template_talk:Convert#Deploying updates now 18,000x slower, Wikipedia:Miscellany for deletion/Wikipedia:Lua/To do, https://en.wikipedia.org/w/index.php?title=Wikipedia_talk:Lua/Archive_1&oldid=1137418039, Creative Commons Attribution-ShareAlike License 3.0.