ICAM Virtual Machine V19 - Kxcad.net

Virtual Machine Reference, Model Customization
The Macro Language, Flow Control in a Macro
TRUE and there is no ELSE block, no blocks of statements are executed. After a block of
statements is executed, control passes to the statement after the “ENDOF/IF” line.
The CASE Statement
A CASE statement allows the user to branch to different blocks of macro code depending on the
value of one expression. It is similar to a complex IF block. The syntax of the CASE statement is
as follows:
1:
n
CASE/ any_expres sion
� 1:
n
�
WHEN/
� statements
�WHEN/OTHER
S �
�� statements �� ENDOF/CASE
�constant [, THRU, constant ] �
�
�
�
The CASE line defines the expression that will be used for comparison against the constants
defined on the WHEN lines. If a WHEN constant matches the CASE expression, the lines
following the WHEN statement are executed up until the next WHEN statement or the
ENDOF/CASE line. The OTHERS keyword following the last of the WHEN statements is
similar to the ELSE statement in the IF block; it matches any remaining conditions. The OTH-
ERS line is optional.
The WHEN statement can list multiple constants and/or ranges of constants. The THRU keyword
specifies a range of constants starting at the value specified before THRU and ending at the
value specified after THRU. Any type of constant can be checked for in a WHEN statement,
with the restriction that the same type of constant be used on both sides of a THRU qualifier.
The WHILE Loop
A WHILE loop describes a block of macro lines to be executed while a given condition is
TRUE. The format of a WHILE loop is as follows:
WHILE/ conditiona l_expressi on
statements
ENDOF/WHIL E
The conditional_expression is tested before entering the block of macro lines. If the condition is
FALSE, control passes to the line following the ENDOF/WHILE line. Otherwise, if the condition
is TRUE, the first line following the WHILE line is executed. When the ENDOF/WHILE
line is reached, control is passed back to the WHILE line, which tests its condition again. The
block of macro lines of the WHILE loop are never entered if the condition is initially FALSE.
The REPEAT Loop
A REPEAT loop describes a block of macro lines to be executed until a given condition is
TRUE. The format of a REPEAT loop is as follows:
REPEAT
statements
UNTIL/ conditiona l_expressi on
ICAM Technologies Corporation – Proprietary 133