Flow Control

Packager Scripting Language › Syntax and Semantics of the Packager Scripting Language › Flow Control

Flow Control

Editing a script can be controlled by inserting an if command with the result that some lines are only edited under special circumstances.

Conditions that may be queried include content, existence, or modification of a parameter.

The condition is formulated following the if or elseif keyword. The following table lists the possible queries:

Query	The query is true if
exist Par1	the parameter Par1 exists
equal Par1 Par2	parameters Par1 and Par2 match
greater Par1 Par2	parameter Par1 is larger than parameter Par2
Par1 == Par2	parameters Par1 and Par2 match
Par1 > Par2	parameter Par1 is larger than parameter Par2
Par1 < Par2	parameter Par2 is larger than parameter Par1
not condition	the condition is not fulfilled

Any strings (constants) or real parameters can be used for Par1 and Par2. Uppercase and lowercase are not differentiated when comparing Par1 and Par2. A larger than or smaller than comparison is possible with numeric values; nonnumeric values are interpreted as zero.

The commands used for flow control and their syntax are as follows:

if condition: The subsequent lines of the script are executed only, if the condition is fulfilled. The if commands can be nested. Every if command must be followed by an endif command later in the script.
else: The subsequent lines of the script are executed only, if all of the conditions of the associated if and elseif conditions are not fulfilled. No text must follow the else keyword.
elseif condition: The subsequent lines of the script are executed only, if the condition is fulfilled and the conditions of all preceding if and elseif conditions were not fulfilled.
endif: Terminates conditional editing. No text must follow the endif keyword.