laura lehn - via Google, I highly recommend Mayflower. Writing the code in it feels like writing pseudocode/prototyping. --Iantresman (talk) 00:06, 12 December 2013 (UTC). thank you. Is it a good idea to deviate from the template standard of calling pages with testcases, tests for the module namespace? Since Lua has lexical scope at the block level rather than the function level, this works similarly to the way Python calls __exit__. The fact that even an IP user may edit the module namespace suggests that it must be really stable and secure. NeoVim, which uses Lua scripts for user script code. I measured the overhead of direct and virtual C++ function calls on the Xenon PowerPC some time ago. 2015 Nils Lagerkvist. The parser seems to reject any effort to initialize a table in the return statement if one of the indexes is, or could be, interpreted as a number. 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. In short, if your coroutine gets GCed and you hold the reference to this local variable as a sol::object on the C++ side, it wont prevent the variable from getting GCed by Lua and your program crashing because of that. I used their packing and moving service the first time and the second time I packed everything and they moved it. Ultimately MediaWiki should issue another tutorial for Wikipedians (without prior knowledge of C and Lua) due to the differences from standard Lua. 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. Also, your feedback here about the best way to organize the data is also welcome. However, the basic API is quite simple, and the advanced features deserves its own post. ( 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 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). Any suggestion on how to receive this parameter template as a table rather than a substituted string? 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. 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. 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"? for example, make this work without copying the args to a new table? I was going to deploy it on Template:Year in other calendars/testcases, but in my preview it runs out of time by the time it gets to the last test. You might also find Moonscript interesting. Then, see if you really need to move this code (or parts of it) to C++. Casey Moving Systems is family owned and has been servicing Northern California for over 25 years. WebYou can call a template from a Lua module using frame:expandTemplate. lua.LVAsBool(v LValue) - Convert to bool, nil and false becomes false. What I'm trying to do is much more complicated, see Module:Convert/makeunits, but is the same issue. The value of any of these keys will never be. WebLua scripts have the same capability with calling MMF events. Now you dont need to ship this init.lua with your binary and life becomes easier. The simplest way to time some Lua code is to use the time command with the resty command. What is the equivalent of {{fullurl:page name}}? 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. Its minimalistic, but requires a lot of boilerplate and manual error-checking. -- Don't need the "%. or subroutine in other languages) It behaves somewhat like a stack as in [Forth] but with one element. {\displaystyle d=3^{(n/2000)}.} WebWhen iterating a table, the function overhead from ipairs does not justify it's use. Servicing Stanislaus, San Joaquin and Merced Counties, 2209 Fairview Drive Suite A Ceres, CA 95307. 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. If so, I can add Module:WikiLink to d:Q14746829. Page contents not supported in other languages. Needs study to guarantee correctness! I've been trying to get to grips with the concept of frames, and I think I'm almost there. Technical 13 (talk) 12:12, 9 May 2013 (UTC). 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). Thats basically all youll ever need to know about Lua. Debresser (talk) 10:57, 8 December 2013 (UTC), Is the "Wikipedia namespaces" infobox necessary top right? 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 (~~~~). via middleclass library), dont do it like this: and then, when you want to create an instance of this class, you do this: Why do it like this? John Victor - via Google, Very nice owner, extremely helpful and understanding This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. Godoc: http://godoc.org/github.com/yuin/gopher-lua, All code in the post can be found at http://github.com/otm/embedding-lua-in-go. 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). -- Sameboat - (talk) 07:07, 18 March 2013 (UTC), Thank Dragons flight for clearing something for me. 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. Iterative multi-file loader, used to load all Lua modules in a directory and return them as one table. = lua.LVAsString(v LValue) - Converts LString and LNumber to string. (At least script error should be shown when print function is detected.) The docs are fantastic too. All rights reserved. Similar to avoiding use of prior utility templates, when writing other utility templates, I would recommend to use the direct #invoke to access Lua functions from a utility template. It is superfluous if you only call the function once within the scope of the local variable, but that is pretty rare. 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. or compute and return values. 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. 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. 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. 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. Is a module supposed to do something clever in order to output tags? Most of the time, you only need one Lua state (lua_State in Lua C API and sol::state in sol2) for everything. 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/. (alright, the bot might miss that one, unless it knows to go back and check a template by the same name also, but you understand) My feeling is that if the reuser is going to put millions of pages on the queue, he should have the chance to decide whether he wants the latest update in the module to be passed along, or if it can wait. Johnuniq (talk) 06:53, 11 October 2013 (UTC), Doesn't Wikipedia's version of Lua allow the GetURL function (or equivalent)? Does mw.ustring.byteoffset work correctly with negative offsets? initialized with the actual arguments given in the function call. If that is not possible: Please suggest an alternative method to implement it. Otherwise false. lua.CanConvToString(v LValue) - True if LString or LNumber. The first clause supports the case where the module is being invoked from a template as {{#invoke: Navbar | navbar}}. Lua doesnt impose one style of writing code on you. The first question, of course, is whether we should require() at all. What do people think? It would be a bit odd. A complete example looks like this: The LState defines some convenience functions, in the example above we are using L.ToInt(1) to fetch the first function argument. See the demos and more details at WikiProject Flag Template. I wonder if there's any actually helpful tutorial for those already familiar with Wikisyntax but without other computer language experience like Lua or C. The tutorials I found usually begin with a simple code to tell you to copy-and-paste (hello, world) then look at the outcome. Is there a way to obtain a list (array) of all pages with a prefix (e.g. That is partly about performance but mostly about engine architecture. Sorry if this was discussed before, but I did not find relevant links in a couple of minutes. 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. Makyen, does that look something like what you wanted? The overhead of a virtual function call was 13.2 nanoseconds, or 42 clock cycles, compared to inline. 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. 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. 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! Learn more. Anomie 03:36, 1 November 2013 (UTC), User:Wnt and I have had a little disagreement over the type parameter of the {{lua}} template. If you'd like to make a request, please do that too! And finally, see what LVE and PICO-8 do. L.DoString runs the Lua code in the VM. Isnt it great? Mr. Stradivarius talk 14:16, 4 November 2013 (UTC). Functions are the main mechanism for abstraction of statements Hex (? --Iantresman (talk) 14:50, 8 December 2013 (UTC). --Iantresman (talk) 13:14, 8 December 2013 (UTC). The problem with 3rd party bindings is that they usually tend to get unmaintained or only support a specific version of the library. 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. Lori Baker - via Google. Functions used by a Lua program can be defined both in Lua and 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. 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 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. The function is followed by the arguments, in order. 1 Answer Sorted by: 3 I would generally recommend to avoid making high volume calls into Lua. 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. You can easily create a Lua state which wont have any functions from the standard library (I/O, coroutines, tables etc. For example, Module:Navbar contains the code: In what case would frame not be equal to mw.getCurrentFrame()? In Module:Sidebar, I extended the boilerplate further to allow a third way, invoking the module from a template and passing args in explicitly (instead of using whatever args were passed to the template), like {{#invoke: Navbar | arg1 = foo | arg2 = bar}}. thank you. OUR MISSION. I am trying to create a weblink by concatenating 2 strings and by avoiding the display of the full link in an infobox. Is there a way for a loadData table to contain these keys? there is no difference between functions defined I very much regret that. I see that I can access Mediawiki libraries as simple as "mw.stat", are modules on Wikipedia accessible as easily? Can one call lua function that returns sevaral strings and pass them to a template? 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. If youre writing a game and want to make it possible for people to create mods, many of your players are likely to know Lua thanks to such games as Minecraft, Factorio, Garrys Mod, World of Warcraft, Roblox and. However, sometimes that is just not enough and an embedded language can be the solution. Youre unlikely to run into performance issues, unless youre making a AA/AAA game or a complex simulation program. 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 The redis instance enables the script to interact with the Redis server that's running At Module:DisplayLuaTableContents I see numerous loops as, , but I learned that strings are immutable and hence this assignment is rather costly. The less data is shared between C++ and Lua, the better. In Chapter 16 we will discuss such calls 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! Its much easier to test if something is non-nil or has a specific type/fields in Lua than in C++. Its neat. At least one such template will be beyond the 500 EPFs/page limit in 2015. The syntax of the template sends another template as parameter. See http://godoc.org/github.com/yuin/gopher-lua#LTable for the LTable Go API. extra parameters get nil. 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. That's a bit of boilerplate code that I've been using in all the modules I write. Much better! Thanks! Older versions of Lua created empty tables with some pre-all ocated slots (four, if I Thank you. A cross between resources, documentation, and useful links. The XLua object also has a substantial MMF Interface for directly querying and modifying game objects and state These timings are likely different on different processor I would have been able to continue contributing to these and other interesting templates. Comments appreciated. 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. 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. 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. Is this a problem in my module or in Scribunto? 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 Your life will be easier if you have a small C/C++ API. In this case we will embed Lua using gopher-lua. Throughout the post L will denote a pointer to lua.LState. Hi, is there a way to instruct string.format to not produce trailing zeros with decimal notation? Text formatting (bold, italics) breaks when the ''/''' tags are not closed for each argument. Or is it something else? I would use them again if needed. Lua adjusts the number of arguments to the number of parameters, Requires all Lua files in a given directory. Calling the LValue.Type() returns the corresponding LValueType. Example: L.GetTop() returns the number of arguments that was used when the function was called. Can they be rewritten in Lua, perhaps? Preceding unsigned comment added by Ryn78 (talk contribs) 03:27, 13 October 2013 (UTC), Is it possible for a module to invoke another module? : Overusing them makes code harder to understand because now you need to make sure that the object youre are pointing to doesnt change unexpectedly. If you only want to call some C/C++ functions from Lua (or some small Lua functions from C/C++) - use Lua C API. 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). That would only apply to your contributions though, not to later modifications made by other editors. The returned integer defines how many return values has been pushed to the Lua stack. The easy part is 'getting rid of the function name': assuming p is the variable in the last line of the program, just say, However, I see no way to get rid of the pipe - it. Mr. Stradivarius talk 23:06, 1 January 2014 (UTC); Page moved without redirect. This concept might be extended to support more than one memory location: Lua has eight basic types: nil (undefined) boolean (boolean) number (numeric) string (string) 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). 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'});. This makes dependencies between files hard to track and require you to manually execute some_class.lua before you can execute script.lua. The resty command itself has a startup and exiting overhead. 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. It can do everything youd ever want from Lua and even more. 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. Ive written many articles about using Lua with C++ on my old blog many years ago. Where I see this is commonly done is in the templates which return links to the archives of talk pages. I would generally recommend to avoid making high volume calls into Lua. If you think that your game became slow because of Lua code, profile first before rewriting it in C++. We really ought to decide, flip a coin, something so we get this sort of stuff to a predictable spot. Download the official Lua source code here: https://www.lua.org/download.html. 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. Because it makes it much easier to track dependencies between various script files and makes them load each other when theyre needed. -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). What am I doing wrong? My own modules populate only the pre-alpha and alpha categories, but there are some here which I know have reached the other levels. Hence, passing 2,000 parameters runs 3 seconds, 4,000 parameters runs 13 seconds, or 6,000 parameters run 27 seconds. For example (C++ functions have cpp postfix): Ask yourself: do all these functions need to be in C++? You can call a function with a number of arguments different from Also explains why the uselang=qqq hack doesn't work to show the scribunto messages. 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). DePiep (talk) 23:55, 21 May 2015 (UTC). in the second case, we use it as an expression: Lua also offers a special syntax for object-oriented calls, In brief, the categories I set up were pre-alpha, alpha, beta, release, and protected. 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. 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. Hex (? Incnis Mrsi (talk) 11:59, 2 July 2013 (UTC), Hi, your feedback is welcome at Bug 50329 - We need a common repository for Scribunto modules and templates. 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. We now have the /doc system somewhat integrated/forced trough the Scribunto extension. 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. 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? in Lua and functions defined in C. As we have seen in other examples, Sandboxing is easy. After the function call, 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? 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. 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. sign in For instance, all library functions are written in C; See discussion at Village Pump (policy)#Protection and management of scripts?. 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.