This is a great golf challenge!
Here's my best solution:
sub score {
my$s;sub S{$_[0]=~X?10:$_[0]}$s+=($l=shift)=~X?10+($_[1]eq'/'?10:S($_[
+0])+S$_[1]):($r=shift)eq'/'?10+S$_[0]:$l+$r for 1..10;$s
}
126 characters. (Or 125, if $r is replaced by a punctuation variable, since a space could then be eliminated.)
During a Chatterbox discussion, tye suggested using a regex to parse the score. This sounded promising, but unfortunately I ended up with a longer solution.
sub score {
$"=my$s;sub S{$_[0]=~X?10:$_[0]}$S="@_";$S=~/(X)(?=(.)(.))|(.\/)(?=(.)
+)|(.)(.)/g,$s+=$1?10+($3eq'/'?10:S($2)+S($3)):$4?10+S($5):$6+$7for 1.
+.10;$s
}
145 characters.
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