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-- This module is intended to replace the functionality of Template:Formatnum and related templates. local p = {} function p. main (frame) local args = frame: getParent (). args local prec = args. prec or '' local sep = args. sep or '' local number = args [1] or args. number or '' local lang = args [2] or args. lang or ''-- validate the language parameter within MediaWiki's caller frame if ...
Lua patterns deliberately lack the most complex regular expression constructs (to avoid bloating the Lua code base), where many other computer languages or libraries use a more complete set. Lua patterns are not even a subset of regular expressions, as there are also discrepancies, like Lua using the escape character % instead of \, , and ...
Only false and nil are false. Even "" is true. Tables can have both numeric and string entries. The two don't overlap. t [1] is distinct from t ["1"]. Uninitialized variables and nonexistent fields in tables are nil. or and and both have shortcut evaluation. = is assignment, == is equality comparison. not is boolean negation, but ~= is ...
[g] (It's possible to make tables that work like this in a Lua program, using things called metatables. That, too, is outwith the scope of this Guide.) An unfortunate side-effect of this is that some of the normal Lua table operators don't work on an args table. The length operator, #, will not work, and neither will the functions in Lua's ...
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Lua version 5.3.4 is implemented in approximately 24,000 lines of C code. [3] [4] Like most CPUs, and unlike most virtual machines (which are stack-based), the Lua VM is register-based, and therefore more closely resembles most hardware design. The register architecture both avoids excessive copying of values, and reduces the total number of ...
Most functions in the module have a version for Lua and a version for #invoke. It is possible to use the #invoke functions from other Lua modules, but using the Lua functions has the advantage that you do not need to access a Lua frame object. Lua functions are preceded by _, whereas #invoke functions are not.