Substring /remove kW

[AntiElitz]

if trying to do this:

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local entity = data.raw["assembling-machine"]["assembling-machine-1"]
entity.energy_usage = entity.energy_usage * factor

However this does not work, since there it is a string with "kW" in it.
So i tried substr(entity.energy_usage, 1, strlen (entity.energy_usage) - 2) to get rid of the kW, but these lua function don't work in Factorio.

Any ideas? Thx for the help!



PS: I also look for a way to increase the item input buffer of an assembling machine (how many items are grabbed in when the assembler is on idle) - help is appreaciated

[aubergine18]

See if this works...

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local energy_usage = tonumber( entity.energy_usage:match('%d+') ) -- get number

entity.energy_usage = tostring( energy_usage * factor ) .. 'kW'

[AntiElitz]

thx! that worked perfectly

[DedlySpyder]

You can get a substring btw, it's string.sub()

[aubergine18]

You can get a substring btw, it's string.sub()

Only if you know the length of the numeric portion of the string... which could be different if some other mod already changed the value to bigger/smaller number.

[DedlySpyder]

You can get a substring btw, it's string.sub()

Only if you know the length of the numeric portion of the string... which could be different if some other mod already changed the value to bigger/smaller number.

string.sub(string, 1, (#string - 2))

You had the right idea originally, just wrong syntax

[Rseding91]

Energy values must end with either "W" or "J". Other than that the 2nd to last character can be any one of the following: k, K, M, G, T, P ,E ,Z, Y.

So, using those rules you can parse out what the value is, remove it, do what you need to do, and then put back what ever symbols you want.