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Function names are often of the form p.myFunctionName, where p is the table from the return p at the bottom of your program. The reason for this is that you can only access functions that are entries in this table from the original #invoke statement. Functions for local use within the program can have any name.
This Lua module is used in system messages, and on approximately 21,500,000 pages, or roughly 35% of all pages. Changes to it can cause immediate changes to the Wikipedia user interface. To avoid major disruption and server load, any changes should be tested in the module's /sandbox or /testcases subpages, or in your own module sandbox .
Marshalling data between C and Lua functions is also done using the stack. To call a Lua function, arguments are pushed onto the stack, and then the lua_call is used to call the actual function. When writing a C function to be directly called from Lua, the arguments are read from the stack. Here is an example of calling a Lua function from C:
It is intended for use by other Lua modules, and should not be-- called from #invoke directly. local libraryUtil = require ('libraryUtil') local checkType = libraryUtil. checkType local arguments = {}-- Generate four different tidyVal functions, so that we don't have to check the-- options every time we call it. local function tidyValDefault ...
Running your code through an IDE is helpful for its text highlighting features, which can help you quickly spot syntax errors. Any IDE with the ability to install a Lua text highlighting plugin should work. This could be as simple as Notepad++ (with Lua selected from the language menu) or as full-featured as Visual Studio Code.
local p = {} local function foo (arg1, arg2)-- Code goes here end function p. foo (frame) return foo (frame. args [1], frame. args [2]) end return p Note also that extracting all the arguments just to pass them to another function may be counterproductive, especially if there are a very large number of them.
Download QR code; Print/export ... local function ipairsAtOffset ... -- The leading backslash will be removed before passed to Lua function.
The length operator, #, will not work, and neither will the functions in Lua's table library. These only work with standard tables, and fail when presented with the special args table. However, the pairs and ipairs functions will both work, as code to make their use possible has been added by the developers.