Module talk:Iteration/doc

Description of the Lua local function "samefile"

It needs five parameters, of which the first three are passed by the invokation
It provides special treatment when str(1) is empty, starts with a dot, or is a dot

1. string:0 a file name, or an extension, or empty
2. integer: current number >= 1
3. string:0 a file name, or an extension, or empty
4. integer: nsnumber, mw.title.getCurrentTitle().namespace
5. string:0 pagename, mw.title.getCurrentTitle().text e.g. a file name when invoked from the FILE namespace

• When the str(1) is neither empty, nor starts with a ".",

then str(1) will be returned.

• Otherwise, when str(1) is empty,

when int(2) = 1

and int(4) is 6 or 7

then str(5) will be returned

otherwise "Example.svg" will be returned;

when int(2) ≠ 1

and str(3) is neither empty, nor starts with a ".",

then str(3) will be returned;

otherwise str(3) is ignored and the same processing occurs as above for int(2) = 1.

• Otherwise, when str(1) starts with a ".",

and int(4) is 6 or 7

then str(5) is assumed to be a valid filename

and str(5) with the extension changed by str(1) will be returned.

When int(4) is neither 6 nor 7

a filename "Example" with the extension str(1) will be returned.

Str(1) starting with a "." can be either a valid extension, or an abbreviation where

• ".p" stands for ".png" (can also be abbreviated with only a ".")
• ".j" stands for ".jpg"
• ".g" stands for ".gif"
• ".s" stands for ".svg"