Redigerer Mal:Str len/core/dok (avsnitt)

==== About ((str len/core)) ====

The code in this template is heavily optimised in several ways:
* If we only go after what the [[Template talk:Str len#Merge the str len templates|NewPP limit reports]] tell, then it might seem we could optimise further by splitting this /core template up into three different /core templates, one for each search round. Since then we don't need the switch-case, and that gives lower values in the NewPP limit reports. However we know it is very costly for the Wikipedia servers to fetch more sub-templates, so we are pretty sure that would be much more costly.
* MediaWiki developers have told us that calling padleft is costly, thus this template uses optimised search trees so it makes as few calls to padleft as possible. See next section for more on the search trees.

Note: The x's used in the explanation from here on just mean "any value from 0 to 9".

This template first searches 0xx to 4xx and then returns 0 to 4, as in 000 to 400. Then it searches x0x to x9x and returns x0 to x9, as in x00 to x90. Then it searches xx0 to xx9 and returns xx0 to xx9. 

This template takes three unnamed (numbered) parameters:

1: The string that we want to know the length of.

2: The number returned by the previous rounds of searching. Thus at first search this parameter should be empty, at second search this parameter should hold a value between 0 and 4, and at third search it should hold a value between 00 and 49. 

3: A word that tells which search should be done. For the first search this parameter should be "hundreds" so it searches from 0xx to 4xx. At second search it should be "tens", so it searches x00 to x90. And at third search it should be "ones", so it searches xx0 to xx9.

The parameters to this template are whitespace sensitive: Parameter 1 must not have any whitespace before it, and parameter 2 must not have any whitespace after it.