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David Schmenk 2014-07-04 20:13:05 -07:00
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@ -272,26 +272,33 @@ Control structures affect the flow of control through the program. There are co
fin
```
The when/is/otherwise/wend statement is similar to the if/elsif/else/fin construct except that it is more efficient. It selects one path based on the evaluated expressions, then merges the code path back together at the end. However only the 'when' value is compared against a list of expressions. The expressions do not need to be constants, they can be any valid expression. The list of expressions is evaluated in order, so for efficiency sake, place the most common cases earlier in the list.
The when/is/otherwise/wend statement is similar to the if/elsif/else/fin construct except that it is more efficient. It selects one path based on the evaluated expressions, then merges the code path back together at the end. However only the 'when' value is compared against a list of expressions. The expressions do not need to be constants, they can be any valid expression. The list of expressions is evaluated in order, so for efficiency sake, place the most common cases earlier in the list. Just as in C programs, a 'break' statement is required to keep one clause from falling through to the next. Falling through from one clause to the next can have it's uses, so this behavior has been added to PLASMA.
```
when keypressed
is keyarrowup
cursup
break
is keyarrowdown
cursdown
break
is keyarrowleft
cursleft
break
is keyarrowright
cursright
break
is keyctrlx
cutline
break
is keyctrlv
pasteline
break
is keyescape
cursoff
cmdmode
redraw
break
otherwise
bell
wend