Very dirty script to count selectors in a CSS file

csscount.sh

#!/bin/sh
cnt=0
depth=0
while read -n 1 char; do
        case $char in
                "{")
                        ((depth++))
                        ;;
                "}")
                        ((depth--))
                        if [ "$depth" -eq "0" ]; then
                                ((cnt++))
                        fi
                        ;;
                ",")
                        ((cnt++))
                        ;;
        esac
done

echo $cnt