Save way to check for empty Macro parameters
Posted: Mon Dec 08, 2008 7:30 pm
Right now there is no save way to check if a Macro parameter is empty.
You could use this trick, but the last one will not work, because the compiler
complains about to many characters between ''
Would be nice to have something like
MacroParameterIsEmpty(param)
Which could return 1 for empty param
Or
MacroParamterLen(param)
Which could return the lenght of the parameter.
Or more general
ExpandedLen(anything)
Which does a normal expansion like already done in macro expansion
and then inserts the constant value for the lenght of the expanded text.
Or use Defined(param) with only one parameter and it gives back 0/1 ?
Of course all those would be compile time functions
Seasons's greetings
Technicorn
You could use this trick, but the last one will not work, because the compiler
complains about to many characters between ''
Code: Select all
Macro SQCHAR
'
EndMacro
Macro SQTME(x)
SQCHAR#x#SQCHAR
EndMacro
Macro m1(param=)
CompilerIf SQTME(param) <> ''
Debug param
CompilerElse
Debug "nothing"
CompilerEndIf
EndMacro
a = 1234
verylongvariable = 1
m1()
m1("Hello")
m1(a)
m1(verylongvariable)
MacroParameterIsEmpty(param)
Which could return 1 for empty param
Or
MacroParamterLen(param)
Which could return the lenght of the parameter.
Or more general
ExpandedLen(anything)
Which does a normal expansion like already done in macro expansion
and then inserts the constant value for the lenght of the expanded text.
Or use Defined(param) with only one parameter and it gives back 0/1 ?
Of course all those would be compile time functions
Seasons's greetings
Technicorn