MiniRobotLanguage (MRL)
EVE. Command
Environment Variable Expand
Intention
Expands Environment Variables. It will expand one or more environment-variables in the given P1 parameter. The result will be on TOS (Top of Stack) or in P2 (Parmeter 2) if given.
Usage is as simple as you can see in the picture below.
While in normal use, you should always use variables which would look like this:
: $$WIN=%windir%
EVE.$$WIN
MBX.The result is: $tos$
ENR.
With exactly the same result. You can give a second parameter, in that case the result will not be on TOS (Top of Stack(, but in that variable.
: $$WIN=%windir%\system\
EVE.$$WIN|$$RES
MBX.The result is: $$RES
ENR.
EVE. allows you to work "from stack to stack". If you do this:
VAR.§§WER=%windir%
PUV.§§WER
STS.DUMP
EVE.
STS.DUMP
This is how the stack will look like:
If you just want to get the value of a Environment variable, you should use EVG.
Use EVS. to set/change the value of environment variables.
Syntax
EVE.P1[|P2]
Parameter Explanation
P1 - (in) Environment variable
P1 - (optional) (out) Variable if omitted, TOS is used
Example
'**********************************************
' EVE. - Sample
'**********************************************
'DBM.2
VAR.§§WER=%windir%
PRT.Unexpanded: §§WER
EVE.§§WER
PRT.from stack ->$$000-
PRT.===========================================
VAR.§§WER=%windir%
PRT.Unexpanded: §§WER
EVE.§§WER|$$RES
PRT.from variable->$$RES-
PRT.===========================================
DMP.4
:over
MBX.Halt to read output
'**********************************************
Remarks
-
Limitations:
-
See also:
• EVG. - Environment Variable Get
• EVS. - Environment-Variable-Set