Logical functions
CLEM expressions can be used to perform logical operations.
| Function | Result | Description |
|---|---|---|
COND1 and COND2
|
Boolean | This operation is a logical conjunction and returns a true value if both COND1 and
COND2 are true. If COND1 is false, then COND2 is not evaluated; this makes it
possible to have conjunctions where COND1 first tests that an operation in COND2 is
legal. For example, length(Label) >=6 and Label(6) =
'x'. |
COND1 or COND2
|
Boolean | This operation is a logical (inclusive) disjunction and returns a true value if either COND1 or COND2 is true or if both are true. If COND1 is true, COND2 is not evaluated. |
not(COND)
|
Boolean | This operation is a logical negation and returns a true value if COND is false. Otherwise, this operation returns a value of 0. |
if COND then EXPR1 else EXPR2 endif
|
Any | This operation is a conditional evaluation. If COND is true, this operation returns the result of EXPR1. Otherwise, the result of evaluating EXPR2 is returned. |
if COND1 then EXPR1 elseif COND2 then EXPR2 else EXPR_N endif
|
Any | This operation is a multibranch conditional evaluation. If COND1 is true, this operation returns the result of EXPR1. Otherwise, if COND2 is true, this operation returns the result of evaluating EXPR2. Otherwise, the result of evaluating EXPR_N is returned. |