I have a list of tuples that I need to emit a C-like boolean expression from:
ranges = [('a','z'),('0','9'),('_','_')]
my template:
"$ranges:{'$it.0$'<=c&&c<='$it.1$'}; separator='||'$"
this outputs:
'a'<=c&&c<='z'||'0'<=c&&c<='9'||'_'<=c&&c<='_'
I would like to check if $it.0$ is the same as $it.1$ and output c==='$it.0$' in this case (in my example this would generate c==='_' for the last tuple). Is this possible?
You can't have any computation in the template (see Stringtemplate compare strings does not work).
A possible way of getting around this would be to use a custom Range class, and store the functionality inside that. Then you could call a method on the range object that returned whether or not the from and to values are equal.
$ranges:{ range | $if(range.fromToEqual)$c === '$range.from$'$else$'$range.from$' <= c && c <= '$range.to$'$endif$}; separator=" || "$
where the method in the Range class is as follows:
public boolean getFromToEqual() { // note the 'get' prefix
return from == to;
}
output:
'a' <= c && c <= 'b'||'1' <= c && c <= '9'|| c === '_'
