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expand IPv6 by shell

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#!/usr/bin/env bash
function expand_ipv6() {
# input: ::
# output: 0:0:0:0:0:0:0:0
# input: 2001:2d:1f::1
# output: 2001:2d:1f:0:0:0:0:1
local ipv6=${1}
local colon_num=$(echo ${ipv6} | awk '{print gsub(/:/, "")}')
local replace_str=""
for (( i = 0; i <= $(( 7 - ${colon_num} )); ++ i )); do
replace_str="${replace_str}:0"
done
replace_str="${replace_str}:"
local ipv6_expanded=${ipv6/::/$replace_str}
[[ ${ipv6_expanded} == *: ]] && ipv6_expanded="${ipv6_expanded}0"
[[ ${ipv6_expanded} == :* ]] && ipv6_expanded="0${ipv6_expanded}"
# return value
echo ${ipv6_expanded}
}

function expand_expanded_ipv6() {
# input: 0:0:0:0:0:0:0:0
# output: 0000:0000:0000:0000:0000:0000:0000:0000
# input: 2001:2d:1f:0:0:0:0:1
# output: 2001:002d:001f:0000:0000:0000:0000:0001
local expanded_ipv6=${1}
local hex_arr=(${expanded_ipv6//:/ })
for (( i = 0; i < 8; ++ i )); do
local len=${#hex_arr[i]}
for (( j = 4; j > ${len}; -- j )); do
hex_arr[i]="0${hex_arr[i]}"
done
done
# return value
echo ${hex_arr[@]} | tr " " :
}

function convert_ipv6_to_decimal_basing_8bit() {
# input(hexadecimal): 0000:0000:0000:0000:0000:0000:0000:0000
# output(decimal): 00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00
# input(hexadecimal): 2001:002d:001f:0000:0000:0000:0000:0001
# output(decimal): 32.1.0.45.0.31.0.0.0.0.0.0.0.0.0.1
local completed_ipv6=${1}
local hex_arr=(${completed_ipv6//:/ })
local hex_arr_split_by_8bit=()
for (( i = 0; i < 8; ++ i )); do
hex_arr_split_by_8bit=( ${hex_arr_split_by_8bit[@]} ${hex_arr[i]:0:2} ${hex_arr[i]:2} )
done
local dec_arr=()
for (( i = 0; i < 16; ++ i )); do
dec_arr=( ${dec_arr[@]} $(echo $(( 16#${hex_arr_split_by_8bit[i]} ))) )
done
# return value
echo ${dec_arr[@]} | tr " " .
}

function convert_ipv6_to_decimal_basing_16bit() {
# input(hexadecimal): 0:0:0:0:0:0:0:0
# output(decimal): 0.0.0.0.0.0.0.0
# input(hexadecimal): 2001:2d:1f:0:0:0:0:1
# output(decimal): 8193.45.31.0.0.0.0.1
local expanded_ipv6=${1}
local hex_arr=(${expanded_ipv6//:/ })
local dec_arr=()
for (( i = 0; i < 8; ++ i )); do
dec_arr=( ${dec_arr[@]} $(echo $(( 16#${hex_arr[i]} ))) )
done
# return value
echo ${dec_arr[@]} | tr " " .
}

expand_ipv6 $1
expand_expanded_ipv6 $(expand_ipv6 $1)
convert_ipv6_to_decimal_basing_8bit $(expand_expanded_ipv6 $(expand_ipv6 $1))
convert_ipv6_to_decimal_basing_16bit $(expand_ipv6 $1)