ICAM Virtual Machine V19 - Kxcad.net

ICAM Virtual Machine ® Virtual Machine Reference, Model Customization
The Macro Language, Flow Control in a Macro
The block of statements is always executed at least once. Each time the UNTIL line is reached,
the conditional_expression is tested. If it is TRUE, control is passed to the line following the
UNTIL line. Otherwise, control is passed back to the top of the block of statements, which are
executed again. The block of statements of a REPEAT loop are entered at least once, unlike
those of the WHILE loop.
The DO Loop
The DO statement iterates a loop variable over a range of values, executing a block of macro
statements on each iteration. The format of the DO statement is as follows:
DO/ variable � start,
end [, step ]
statements
ENDOF/DO
The step increment does not need to be specified. It defaults to one (1). The start value, end
value and step increment value are evaluated when the DO line is first reached. The loop variable
is then assigned the start value. A test is performed on each iteration before executing the
statements. If the loop variable has passed the end value, control passes to the statement after the
ENDOF/DO. Each time the ENDOF/DO line is reached, the step increment value is added to the
loop variable and the cycle repeats.
If the step increment value is positive, the termination test is that the loop variable is greater than
the end value. If the increment value is negative, the termination test is that the loop variable is
less than the end value. For the default case in which the increment is one, the loop variable has a
value of one added to it until it is greater than the end value.
Exiting Loops (EXIT)
The EXIT command is used to exit a given number of nested loop levels, transferring control to
the statement immediately following the given loop. Each WHILE, REPEAT or DO loop that the
EXIT statement is nested within counts as one level (note that IF and CASE statements do not
count as a level).
The format of the EXIT statement is as follows:
EXIT [ / levels ]
The levels value is a whole unsigned number. If not specified, the default number of levels is 1.
Unconditional Jumps (JUMPTO)
The JUMPTO statement is used to transfer control to a labeled statement within the same macro.
The label may be above or below the JUMPTO statement. The labeled statement starts with the
name of the label, followed by a colon (:). Labels must be alphanumeric. They can start with
either a letter or a digit, but must contain at least one letter. The format of the JUMPTO statement
is as follows:
JUMPTO
/ label _name
�
label _name
:
134 ICAM Technologies Corporation – Proprietary