Or is it something else? 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. 2000 Thats basically all youll ever need to know about Lua. I am trying to create a weblink by concatenating 2 strings and by avoiding the display of the full link in an infobox. --Jarekt (talk) 16:24, 14 March 2013 (UTC), Are module authors permitted to use other licenses (presumably in addition to the CC-BY-SA license) for modules they develop? Mr. Stradivarius talk 12:54, 10 July 2013 (UTC), We have {{WikiProject Lua/header}} that does the header tabs (I started). Installation You can download the latest release manually and include For example, I might want to process the posts on a talk page, and add some extra formatting. 2015 Nils Lagerkvist. Otherwise true. Debresser (talk) 10:57, 8 December 2013 (UTC), Is the "Wikipedia namespaces" infobox necessary top right? 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 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. Calling the LValue.Type() returns the corresponding LValueType. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. So tonight I put together Module:Unsubst, which can be used to do the same thing without all the limitations of {{unsubst}}. Iterative multi-file loader, used to load all Lua modules in a directory and return them as one table. Theyre mostly written in C/C++ and only expose a bunch of Lua functions/tables to the user. 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). My own modules populate only the pre-alpha and alpha categories, but there are some here which I know have reached the other levels. 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. 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. 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. Ive written many articles about using Lua with C++ on my old blog many years ago. In the example bellow sayHello function is first defined, and then called in the second call to DoString. --Iantresman (talk) 13:14, 8 December 2013 (UTC). These timings are likely different on different processor 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. Comments appreciated. 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. 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. This was possible because the wikimarkup language was very intuitive, and easy to understand even for the layman. After the function call, For example: Instead I need to output: "0.00001 1.2 3". Best Mr. Stradivarius talk 10:42, 27 March 2013 (UTC), You've got it pretty much right. And finally, see what LVE and PICO-8 do. Stormworks Lua with LifeBoatAPI the results which can be obtained by a user with the Special:PrefixIndex page)? If you wish to retain the metadata for logging or other purposes, the entire metadata table is returned as the third return value from load(), containing the metadata for every key that was operated on (including those with no conflicts). 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. See a simple example of how to build Lua with CMake and use it with sol2 here. One of the most versatile and used data structures in Lua is LTable (actually it is the only one). For optional arguments the L.Opt(n int, default T) functions can be used. Makyen (talk) 05:58, 1 January 2014 (UTC), That makes sense. 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. GitHub - Samur3i/direct-loader: Requires all Lua files in a Anomie 03:36, 1 November 2013 (UTC), User:Wnt and I have had a little disagreement over the type parameter of the {{lua}} template. At Module:DisplayLuaTableContents I see numerous loops as, , but I learned that strings are immutable and hence this assignment is rather costly. 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 (~~~~). But with the banning of the print function and the extra steps to validate the lua code in Wiki, I can't tell if the lua.org tutorial truly helpful to me as I don't know how to convert all those examples to comply with MediaWiki's lua standard. 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. Page content can be retrieved with the getContent () method of the title object. Perhaps li in a list or tr in a table? Johnuniq (talk) 02:22, 25 June 2013 (UTC). Hex (? The documentation toolbox does not yet know about Module testcases (though the editnotice 'sort of' does). Is this a problem in my module or in Scribunto? You couldn't keep track of your old experiments, and my experience is that yes, I. -- Gets args.rowtype1, args.rowtype2, etc. If anyone could help me to work this out I'd be very grateful. 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. 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. to use Codespaces. 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. This code is OK (calling C++ from Lua is cheap): This code is not that good (calling Lua from C++ is slow): Profile first. You can call a function with a number of arguments different from :) Wnt (talk) 02:58, 6 January 2014 (UTC). Snipre (talk) 07:52, 31 October 2013 (UTC), Is there a LUA method for '#ifexist' that doesn't generate false incoming links? Link/Create testcases link for Module pages. All rights reserved. Otherwise empty string. At the moment, we have three patterns in naming a module sandbox page: I suggest that is one too much. What should I do to return a large text built from numerous smaller elements? Exposing Go functions to Lua is essential to create custom a custom API. What to write in C++: collision detection, path finding, physics, renderer and other things that are performance critical. --Rotpunkt (talk) 12:35, 1 May 2013 (UTC), Hello, I'm wondering if there is currently a module that counts elements on a page. try: with open("foo.txt") as f: 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. Timing Lua Code Correctly in OpenResty If you'd like to make a request, please do that too! Is a module supposed to do something clever in order to output tags? 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! 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/. How do I fix this? The problem with 3rd party bindings is that they usually tend to get unmaintained or only support a specific version of the library. 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. 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. 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. 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. 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? 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). 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? What do people think? Is there a way for a loadData table to contain these keys? ) The reference manual for Lua 5.4s C API is here: https://www.lua.org/manual/5.4/manual.html#4, Github repo: https://github.com/ThePhD/sol2. Village Pump (policy)#Protection and management of scripts? We are proud to provide our customers with these services and value by trained professionals. For instance, all library functions are written in C; For instance, if we have a function like. 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. ), You dont need a specialized IDE or tools to write Lua comfortably. Of course, you can check for this files existence and handle errors appropriately (e.g. Learn more. 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. I've been trying to use some of the other frame functions, and I can get them working via #invoke, but not through the debug console. The function is followed by the arguments, in order. The first question, of course, is whether we should require() at all. Casey Moving Systems is family owned and has been servicing Northern California for over 25 years. A surprisingly simple Lua compilerExtended version Your life will be easier if you have a small C/C++ API. may be relevant to this problem. :P Anyway, I have taken that idea and added some parameter checking and some documentation, and called it Module:User:Mr. Stradivarius/PrefixIndex. They are iteration functions, so they add the overhead of a function call to each loop iteration. "factorial: argument must be a number >= 0", -- likely something like 1=foo=bar, we need to do it as a named arg. Although Lua can still process the 6,000 parameters, to compare choices, within "0.02" Lua seconds, the load time of the #invoke interface is 27 seconds. Can someone make a nice SpecialPages adjustment? ), The disadvantage of course is that bugfixes in modules like Redirect don't get passed on. You can divide up your code into separate functions. 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). WebThe Redis Lua execution context always provides a singleton instance of an object named redis . lua.LVIsFalse(v LValue) - Returns true if nil or false. Calling JavaScript Mr. Stradivarius talk 23:06, 1 January 2014 (UTC); Page moved without redirect. 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. There was a problem preparing your codespace, please try again. Lua 5.4 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. The same can be said about making your program expandable with plugins. Its much easier to test if something is non-nil or has a specific type/fields in Lua than in C++. I would generally recommend to avoid making high volume calls into Lua. Everyone took really good care of our things. extra parameters get nil. a function definition has a conventional syntax; Greetings Stephan Kulla (talk) 15:54, 19 May 2013 (UTC), (Sorry for writing here. Since Lua has lexical scope at the block level rather than the function level, this works similarly to the way Python calls __exit__. Lori Baker - via Google. . lua.LVAsBool(v LValue) - Convert to bool, nil and false becomes false. It Is Me Here t / c 15:08, 3 September 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. n Sandboxing is easy. Clearly it's worth thinking about ways to reduce this impact as much as possible. I was just trying to return those hex tables via loadData and seem to have run into a nasty surprise. And to fetch an argument without conversion the L.Get(n int) function can be used. 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 Redis Lua API reference | Redis ]], "jo")' But there is a catch. --Aftab1995 (talk) 15:50, 23 May 2013 (UTC), I'm very happy to announce that Template:FlagiconLua has reached feature parity with Template:Flagicon! John Victor - via Google, Very nice owner, extremely helpful and understanding Is it a good idea to deviate from the template standard of calling pages with testcases, tests for the module namespace? Also explains why the uselang=qqq hack doesn't work to show the scribunto messages. Thank you!--QuimGil (talk) 07:52, 21 June 2013 (UTC). The messages for /doc inclusion are currently added as contentlanguage, where really only their parameter should be included as such. You can call it with LuaJITs FFI, see the tutorial here. Dont put too much code into one script - its easy to separate everything into smaller scripts. with nil arguments removed. 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. 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. 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. The NewPP parser hits the huge delays when passing 6,000 parameters whether to Lua, or to a template, or to a #switch parser function of 6,000 "|x=" branches. there is no difference between functions defined Is there a programme wizard who can help see if I've done something stupid? Please let me know your thoughts over at Template talk:Pagetype#Module:Pagetype. 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. Needs study to guarantee correctness! I have used the mw.title library with a call like mw.title.new(page_name):fullUrl({uselang=lang}), but mw.title.new() is marked as an expensive function so I would like to known if there are alternative.--Moroboshi (talk) 07:06, 18 May 2013 (UTC), Is there a way to use the Mediawiki API inside Lua? Now the tab "Modules" does not show all modules, and does not have a 'next page' link. 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. It can do everything youd ever want from Lua and even more. Page contents not supported in other languages. These snippets of Python and Lua are roughly equivalent. Given an instance myqobject of this class, a Lua program can emit signal mysignal as follows The functions in question had a single parame !) 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. 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. I'm a happy user of this space myself with the pet projects I develop in my free time. 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. Preceding unsigned comment added by Ryn78 (talk contribs) 03:27, 13 October 2013 (UTC), Is it possible for a module to invoke another module? Sorry if this was discussed before, but I did not find relevant links in a couple of minutes. Automatic insertion of the green 'chrome' of our template documentation. Its simple. It receives a *lua.LState and returns an integer. Wnt (talk) 15:52, 22 January 2014 (UTC), Wikipedia:Lua/To do, a page you substantially contributed to, has been nominated for deletion. 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. We now have the /doc system somewhat integrated/forced trough the Scribunto extension. Your help pointing to ways to improve is welcome. That's a bit of boilerplate code that I've been using in all the modules I write. Requires all Lua files in a given directory. For instance, all library functions are written in C; While still largely relevant for later versions, there are some differences.The fourth edition targets Lua 5.3 and is available at Amazon and other bookstores.By buying the book, you also help to support the Lua project. = This can result in slow compilation times, unreadable error messages and some interfaces are not that friendly (e.g. Toohool (talk) 17:18, 27 March 2013 (UTC), I have another related question. 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. Prompt and friendly service as well!