Generate case range in bash - bash

Question

I want to input two and three digit numbers into a function and output a case range, i.e., input 33 and 66 and output 3[3-9] | [4-5][0-9] | 6[0-6] or input 33 and 666 and output 3[3-9] | [4-9][0-9] | [1-5][0-9][0-9] | 6[0-5][0-9] | 66[0-6]
What are some ideas as to how? Thanks!

Answer 1

Just want to share the final code: https://gist.github.com/zaydek/1627329f88c444f6d71d5cbc0cda616f :)
function enc {
a=${1: -3:1}; b=${1: -2:1}; c=${1: -1}
d=${2: -3:1}; e=${2: -2:1}; f=${2: -1}
if (( $[a] < $[d] )); then
if (( $b$c == 00 && $e$f == 99 )); then echo [$a-$d][0-9][0-9]
elif (( $b$c == 00 )); then if (( $[a+1] < $d )); then echo [$a-$[d-1]][0-9][0-9] "|"; echo $(enc $[d]00 $d$e$f)
else echo $a[0-9][0-9] "|"; echo $(enc $[a+1]00 $d$e$f); fi
else echo $(enc $a$b$c $[a]99) "|"; echo $(enc $[a+1]00 $d$e$f); fi
elif (( $b < $e )); then
if (( $c == 0 && $f == 9 )); then echo $a[$b-$e][0-9]
elif (( $c == 0 )); then if (( $[b+1] < $e )); then echo $a[$b-$[e-1]][0-9] "|"; echo $(enc $a$[e]0 $d$e$f)
else echo $a$b[0-9] "|"; echo $(enc $a$[e]0 $d$e$f); fi
else echo $(enc $a$b$c $a$[b]9) "|"; echo $(enc $a$[b+1]0 $d$e$f); fi
else
if (( $c == $f )); then echo $a$b$c
else echo $a$b[$c-$f]; fi; fi
}
function int {
if [[ $1 = *.* ]]; then
integer=${1%.*}
decimal=${1#*.}
if (( ${decimal:0:1} >= 5 )); then integer=$[integer+1]; fi
echo $integer
else echo $1; fi
}
function cse {
minimum=$(int $(echo $1 $2 | awk '{ print ($1/$2)*( 90) }'))
maximum=$(int $(echo $1 $2 | awk '{ print ($1/$2)*(110) }'))
echo $(enc $minimum $maximum)
}
cse $1 $2
cse takes two inputs, converts them to decimals, and multiples each from a range, i.e., 90 and 110 for -10% and +10% error range, then passes off the minimum and maximum outputs as inputs to enc which is a recursive function that generates case range syntax (with syntax optimization).
Please note, bash does not appear to handle expressions for case ranges as expected or intended. Though, this code can be used to generate case ranges for all 2 to 3 digit numbers and then copied and pasted as inline code.

Answer 2

Here is the max 2 digits case for 0-99, I'd not used character's operations indeed I'd tried math arithmetic.
The following are some output:
./range.sh 1 39 -> 0[1-9] | [1-2][0-9] | 3[0-9]
./range.sh 21 49 -> 2[1-9] | [3-4][0-9]
./range.sh 33 66 -> 3[3-9] | [4-5][0-9] | 6[0-6]
./range.sh 33 99 -> 3[3-9] | [4-8][0-9] | 9[0-9]
Here is my code: range.sh, hope it can provide some help for you:
#!/bin/bash
LHS=$1
RHS=$2
B2=10
D2=$(echo "($RHS-$LHS)/$B2" | bc)
if [[ ${D2} -gt 0 ]]; then
S2=(`seq $(echo "$LHS/$B2" | bc) $(echo "$LHS/$B2+$D2" | bc)`)
#echo ${S2[#]}
C=${#S2[#]}
#echo $C
L1=$(echo "$LHS%$B2" | bc)
if [[ ${L1} -lt 9 ]]; then
L1R="[${L1}-9]"
else
L1R="9"
fi
R1=$(echo "$RHS%$B2" | bc)
if [[ ${R1} -gt 0 ]]; then
R1R="[0-${R1}]"
else
R1R="[0-9]"
fi
if [[ ${C} -gt 3 ]]; then
echo -n $(echo "$LHS/$B2" | bc)$L1R
echo -n " | "[${S2[1]}-${S2[$C-2]}][0-9]
echo -n " | "${S2[$C-1]}$R1R
elif [[ ${C} -eq 3 ]]; then
if [[ ${S2[0]} -eq 0 ]]; then
echo -n 0$L1R
else
echo -n $(echo "$LHS/$B2" | bc)$L1R
fi
echo -n " | "[${S2[1]}-${S2[$C-1]}][0-9]
fi
else
echo [$LHS-$RHS]
fi
echo

Answer 3

Here is the logic for 2 digit numbers:
#!/bin/bash
l=$1
h=$2
function get_nearest_upper_10th_mutlitple()
{
v=$(($1+10))
echo "${v%?}0"
}
function get_nearest_lower_10th_mutlitple()
{
v=$1
echo "${v%?}0"
}
temp="$(printf '%d' $l | wc -m)$(printf '%d' $h | wc -m)"
case $temp in
11) echo "[$l-$h]" ;;
22|12)
a=$([[ $(($l%10)) -eq 0 ]] && echo $l || echo $(($(get_nearest_upper_10th_mutlitple $l)-1)))
if [[ $(printf '%d' $a | wc -m) -eq 1 ]]; then
echo [$l-$a]
else
[[ $a -gt $l ]] && echo "${l%?}[${l#?}-${a#?}]" || echo $a
fi
b=$([[ $(($h%10)) -eq 0 ]] && echo $h || get_nearest_lower_10th_mutlitple $h)
x=$((a+1))
y=$((b-1))
echo "[$(echo ${x%?}~${y%?} | sed 's/~/\n/g' | sort -n | uniq | paste -s -d '-')][${x#?}-${y#?}]"
[[ $b -lt $h ]] && echo "${h%?}[${b#?}-${h#?}]" || echo $b
esac
Here are sample outputs:
$ ./script.bash 2 8
[2-8]
$ ./script.bash 2 6
[2-6]
$ ./script.bash 2 68
[2-9]
[1-5][0-9]
6[0-8]
$ ./script.bash 23 68
2[3-9]
[3-5][0-9]
6[0-8]
$ ./script.bash 23 99
2[3-9]
[3-8][0-9]
9[0-9]
$ ./script.bash 23 80
2[3-9]
[3-7][0-9]
80
$ ./script.bash 40 80
40
[4-7][1-9]
80
$ ./script.bash 40 80 | paste -s -d '|'
40|[4-7][1-9]|80
$ ./script.bash 35 55
3[5-9]
[4][0-9]
5[0-5]
You can use paste -s -d '|' to combine the individual ranges into a single ORed range.
You can use the existing functions which I've made to extend it for 3 digit numbers (I'll post the 3 digit version too after some time with different cases for 13 and 12).