If-then-else-endif statements are used in design scripts to determine if an element has certain attributes and to control program flow based on the results. The following are example syntaxes:

if (expression) then
  1 or more statements
endif

OR

if (expression) then
	 1 or more statements
else
	 1 or more statements
endif

OR

if(expression) then
	  1 or more statements
else if (expression) then
	  1 or more statements
else if ...
 else
	  1 or more statements
endif

The expression portion of an if statement must evaluate to an integer and is typically true or false. Any nonzero value is considered true. If the expression evaluates to false, or zero, the else portion of the statement, if present, is executed. The following design script segment makes use of the if-then-else-endif construct.

Example:

if (level == 23) then
	  style = (1, 0.5)
	  color = "green"
else if (level == 45) then
	  style = (1.0, 0.25, 0.5, 0.25) then
	  area_fill = true
	  color = "blue, sky"
else
 	 style = 0
	  color = (0, 0, 0)
endif