Math Functions in FGII?

[Insanity]

I've done some searching, but could not find the documentation of the math functions supported in the .xml scripting. In the d20 charsheet_templates.xml file, within the template for abilitybonus, there is a line that reads:

<script>
				function onSourceUpdate()
					setValue(math.floor((sources[scorefield[1]].getValue() - sources[damagefield[1]].getValue() - 10) / 2) + getModifier());
				end

				function onInit()
					addSource(scorefield[1]);
					addSource(damagefield[1]);

					super.onInit();
				end
			</script>

This is where the bonuses for an ability are calculated. I've been able to change it to get different results. What I am looking for is how to say round to nearest integer and such. Or even If x>=20, y= type functions. Any ideas?

[joshuha]

LUA is the scripting language used. For the math lib look here for reference https://www.lua.org/manual/5.1/manual.html#5.6

[Insanity]

thanks for the source