<< Click to Display Table of Contents >> Navigation:  3. Script Language > Variable Definitions and Operations > Variable Commands

---

MiniRobotLanguage (MRL)

 

VAV. Command

VAriables with Variables

 

 

Intention

 

This command can be used to assign a Value to a Variable.

 

It will resolve variables that are with a given variable up to any Level.

 

The normal VAR. command does not touch already resolved variable bytes, to be binary compatible to some degree, and to avoid dead-locks.

 

VAV. will also resolve special folders and variables to MaxVarRes which is 255 by default. MaxVarRes is set using the OPT.-command). Lets see an example:

 

'**********************************

' VAR. / VAV. comparison

'**********************************

VAB.$$TXA=Theo

VAB.$$TXB=$$TXA

VAB.$$TXC=$$TXB

 

VAV.$$TXD=$$TXC

DBV.$$TXD

' VAV. returns "Theo"

 

VAR.$$TXD=$$TXC

DBV.$$TXD

' VAR. returns "$$TXB"

 

END.

'**********************************

 

As you can see, VAR. does not resolve to any depth, while VAV. will.

 

 

If there are variables that will resolve to variables which resolve to variables in a circular way, VAV. may resolve again and again until MaxDepth is reached. See this example:

 

'**********************************

' VAR. / VAV.

'**********************************

'

' We set maximum resolution depth for variables

' to 255 (which is the default value)

OPT.MaxVarRes|255

 

VAB.$$TXA=Theo $$TXB

VAB.$$TXB=$$TXA

 

VAV.$$TXD=$$TXB

DBV.$$TXD

' VAV. returns "Theo Theo Theo Theo Theo Theo Theo Theo" etc.

 

VAR.$$TXD=$$TXB

DBV.$$TXD

' VAR. returns "$$TXB"

 

END.

'**********************************

 

 

Please see the difference in the example below.

 

 

 

 

Syntax

 

VAV.P1=[P2]

 

 

Parameter Explanation

 

P1 - Variable-name

 

P2 - Value that will be assigned to the variable. If P2 is omitted,

    the variable will be set to empty.

 

 

 

 

 

Example

 

'**********************************

' VAV.

'**********************************

VAB.$$TXA=Theo

VAB.$$TXB=$$TXA

VAB.$$TXC=$$TXB

VAV.$$TXD=$$TXC

DBV.$$TXD

END.

VAR.$$ABC=->$$AAA

MBX.$$ABC

 

 

 

Remarks

 

Its important to understand that the VAV.-Command should not be used for binary content which is for example loaded using CFF. Use VAB. or VAO or even VAR. instead.

 

 

 

Limitations:

 

-

 

 

See also:

 

•     2.1 : - Definiton-Command

•     VBA. - Variable Binary Append

•     OPT. - Optional Settings

•     VAB. - Variable Binary

•     VAC. - Variable reCt

•     VAN. - Variable Numeric

•     VAO. - Variable Once

•     VAP: - Variable Point

•     VAR. - Variable Set Value/Clear

•     VAS. - Variable with String

•     VAV. - Variables with Variables

•     CAL. - mathematical CALculation