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shl_semver
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#!/bin/bash
# semanic version number parser
# A normal version number MUST take the form X.Y.Z where X, Y, and Z are
# non-negative integers, and MUST NOT contain leading zeroes.
# X is the major version, Y is the minor version, and Z is the patch version.
#
# A pre-release version MAY be denoted by appending a hyphen and a series
# of dot separated identifiers immediately following the patch version.
#
# Build metadata MAY be denoted by appending a plus sign and a series of dot
# separated identifiers immediately following the patch or pre-release version.
#
# Extensions to allow other versioning schemes
# 1. Any number of version number parts are allowed
# 2. A version number can have leading 0
# 3. Number comparison is always base 10
# 4. Prerelease and build parts support more characters that are not shell
# interpreted such as spaces
# 4. A version number part can be empty and it will default to the value of 0.
# Ex. 1...4 = 1.0.0.4 and . = 0.0
# Future extension if determined if it is needed
# 1. Support more characters in the prerelease and build parts.
# This can be done by escapting characters when string is used in the
# pattern match or use substring parameter expansion to pull things apart.
# 2. Support a prefix part before the version number
# There are various ways to do this.
vn_Parse() {
local prevShopt="$(shopt -p extglob)"
shopt -s extglob
local prereleaseBuild="${1##+([[:digit:].])}"
eval "${prevShopt}" || true
local version="${1%${prereleaseBuild}}"
local prerelease=
local build=
[[ -n "${version}" && -n "${prereleaseBuild}" ]] && {
if [[ ${prereleaseBuild:0:1} == "-" ]]
then
prereleaseBuild=${prereleaseBuild:1}
if [[ "${prereleaseBuild}" =~ .*\+ ]]
then
build="${prereleaseBuild#*+}"
prerelease="${prereleaseBuild%+${build}}"
else
prerelease="${prereleaseBuild}"
fi
elif [[ ${prereleaseBuild:0:1} == "+" ]]
then
build=${prereleaseBuild:1}
else
version=
fi
}
local -a $2
IFS=$'\t' read -a $2 <<< "${version:-\"\"} ${prerelease:-\"\"} ${build:-\"\"}"
local _array=$(declare -p $2)
_array="${_array//\"\\\"\\\"\"/\"\"}"
echo ${_array}
[[ -n "${version}" ]] && return 0 || return 1
}
vn_isNumeric() {
[[ -n "${1}" && "${1}" =~ ^[0-9]+$ ]]
}
# dotString arrayName defaultValue
vn_dotStringToArray() {
local _dotString="${1}"
[[ "${_dotString: -1}" == "." ]] && _dotString+="."
local -a $2
IFS=. read -a $2 <<< "${_dotString}"
local array=$(declare -p $2)
[[ "${3:+default}" == "default" ]] && {
array="${array//\"\"/\"${3}\"}"
}
echo ${array}
}
# A pre-release version MAY be denoted by appending a hyphen and a series
# of dot separated identifiers immediately following the patch version.
# 1. Identifiers MUST comprise only ASCII alphanumerics and hyphen [0-9A-Za-z-].
# 2. Identifiers MUST NOT be empty.
# 3. Numeric identifiers MUST NOT include leading zeroes.
# 4. Pre-release versions have a lower precedence than the associated
# normal version.
# A pre-release version indicates that the version is unstable and might
# not satisfy the intended compatibility requirements as denoted by its
# associated normal version.
# Examples: 1.0.0-alpha, 1.0.0-alpha.1, 1.0.0-0.3.7, 1.0.0-x.7.z.92.
# Precedence refers to how versions are compared to each other when ordered.
# 1. Precedence MUST be calculated by separating the version into
# major, minor, patch and pre-release identifiers in that order
# (Build metadata does not figure into precedence).
# 2. Precedence is determined by the first difference when comparing
# each of these identifiers from left to right as follows:
# A. Major, minor, and patch versions are always compared numerically.
# Example: 1.0.0 < 2.0.0 < 2.1.0 < 2.1.1.
# 3. When major, minor, and patch are equal, a pre-release version
# has lower precedence than a normal version.
# Example: 1.0.0-alpha < 1.0.0.
# 4. Precedence for two pre-release versions with the same major, minor,
# and patch version MUST be determined by comparing each dot separated
# identifier from left to right until a difference is found as follows:
# A. Identifiers consisting of only digits are compared numerically
# B. Identifiers with letters or hyphens are compared lexically in
# ASCII sort order.
# C. Numeric identifiers always have lower precedence than non-numeric
# identifiers.
# D. A larger set of pre-release fields has a higher precedence than a
# smaller set, if all of the preceding identifiers are equal.
# Example: 1.0.0-alpha < 1.0.0-alpha.1 < 1.0.0-alpha.beta < 1.0.0-beta
# < 1.0.0-beta.2 < 1.0.0-beta.11 < 1.0.0-rc.1 < 1.0.0.
#
vn_comparePrerelease() {
eval $(vn_dotStringToArray "${1}" "_prerel1")
eval $(vn_dotStringToArray "${2}" "_prerel2")
[[ -z "${1}" && -z "${2}" ]] && return 0
[[ -z "${1}" && -n "${2}" ]] && return 1
[[ -n "${1}" && -z "${2}" ]] && return 2
local _numCmpParts=${#_prerel1[@]}
[[ ${#_prerel1[@]} > ${#_prerel2[@]} ]] && _numCmpParts=${#_prerel2[@]}
for (( i=0; i < ${_numCmpParts}; i++ ))
do
local _part1=${_prerel1[i]}
local _part2=${_prerel2[i]}
if [[ "${3:-sensitive}" != sensitive ]]
then
_part1=$(tr '[:upper:]' '[:lower:]'<<<"${_part1}")
_part2=$(tr '[:upper:]' '[:lower:]'<<<"${_part2}")
fi
if vn_isNumeric "${_part1}" && vn_isNumeric "${_part2}"
then
(( 10#${_part1} > 10#${_part2} )) && return 1
(( 10#${_part1} < 10#${_part2} )) && return 2
else
[[ ${_part1} > ${_part2} ]] && return 1
[[ ${_part1} < ${_part2} ]] && return 2
fi
done
[[ ${#_prerel1[@]} -gt ${_numCmpParts} ]] && return 1
[[ ${#_prerel2[@]} -gt ${_numCmpParts} ]] && return 2
return 0
}
# version number compare - = returns 0; > returns 1; < returns 2
vn_Compare () {
[[ ${#} -lt 2 || ${#} -gt 3 ]] && return 255
local caseSensitivity="sensitive"
[[ ${3:-noset} != "notset" && ${3:-notset} != "sensitive" ]] && {
caseSensitivity="insensitive"
}
local _semver1 _semver2 _array
_array=$(vn_Parse "${1}" "_semver1") || return 254
eval "${_array}"
_array=$(vn_Parse "${2}" "_semver2") || return 254
eval "${_array}"
[[ -z "${_semver1[0]}" || -z "${_semver2[0]}" ]] && return 254
local _ver1 _ver2
eval $(vn_dotStringToArray "${_semver1[0]}" "_ver1" 0)
eval $(vn_dotStringToArray "${_semver2[0]}" "_ver2" 0)
[[ "${_semver1[0]}${_semver1[1]}" != "${_semver2[0]}${_semver2[1]}" ]] && {
local i
local _low="" _fill _maxlen
if ((${#_ver1[@]} > ${#_ver2[@]}))
then
_maxlen=${#_ver1[@]}
_low=${#_ver2[@]}
_fill="_ver2"
elif ((${#_ver1[@]} < ${#_ver2[@]}))
then
_maxlen=${#_ver2[@]}
_low=${#_ver1[@]}
_fill="_ver1"
else
_maxlen=${#_ver1[@]}
fi
if [[ -n "${_low}" ]]
then
for ((i=${_low}; i<${_maxlen}; i++))
do
[[ "${_fill}" == "_ver1" ]] && _ver1[i]=0 || _ver2[i]=0
done
fi
for ((i=0; i<${_maxlen}; i++))
do
(( 10#${_ver1[i]} > 10#${_ver2[i]} )) && return 1
(( 10#${_ver1[i]} < 10#${_ver2[i]} )) && return 2
done
}
vn_comparePrerelease "${_semver1[1]}" "${_semver2[1]}" "${caseSensitivity}"
}