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-- semver.lua - v1.1.0 (2012-01)
-- Copyright (c) 2012 Enrique García Cota
-- Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
-- The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-- See http://semver.org for details
local version = {}
local function checkPositiveInteger(number, name)
assert(number >= 0, name .. ' must be a valid positive number')
assert(math.floor(number) == number, name .. ' must be an integer')
end
local function present(value)
return value and value ~= ''
end
-- splitByDot("a.bbc.d") == {"a", "bbc", "d"}
local function splitByDot(str)
local t, count = {}, 0
str:gsub("([^%.]+)", function(c)
count = count + 1
t[count] = c
end)
return t
end
local function parsePrereleaseAndBuildWithSign(str)
local prereleaseWithSign, buildWithSign = str:match("^(-[^+]+)(+.+)$")
if not (prereleaseWithSign and buildWithSign) then
prereleaseWithSign = str:match("^(-.+)$")
buildWithSign = str:match("^(+.+)$")
end
assert(prereleaseWithSign or buildWithSign, ("The parameter %q must begin with + or - to denote a prerelease or a build"):format(str))
return prereleaseWithSign, buildWithSign
end
local function parsePrerelease(prereleaseWithSign)
if prereleaseWithSign then
local prerelease = prereleaseWithSign:match("^-(%w[%.%w-]*)$")
assert(prerelease, ("The prerelease %q is not a slash followed by alphanumerics, dots and slashes"):format(prereleaseWithSign))
return prerelease
end
end
local function parseBuild(buildWithSign)
if buildWithSign then
build = buildWithSign:match("^%+(%w[%.%w-]*)$")
assert(build, ("The build %q is not a + sign followed by alphanumerics, dots and slashes"):format(buildWithSign))
return build
end
end
local function parsePrereleaseAndBuild(str)
if not present(str) then return nil, nil end
local prereleaseWithSign, buildWithSign = parsePrereleaseAndBuildWithSign(str)
local prerelease = parsePrerelease(prereleaseWithSign)
local build = parseBuild(buildWithSign)
return prerelease, build
end
local function parseVersion(str)
local sMajor, sMinor, sPatch, sPrereleaseAndBuild = str:match("^(%d+)%.?(%d*)%.?(%d*)(.-)$")
assert(type(sMajor) == 'string', ("Could not extract version number(s) from %q"):format(str))
local major, minor, patch = tonumber(sMajor), tonumber(sMinor), tonumber(sPatch)
local prerelease, build = parsePrereleaseAndBuild(sPrereleaseAndBuild)
return major, minor, patch, prerelease, build
end
-- return 0 if a == b, -1 if a < b, and 1 if a > b
local function compare(a,b)
return a == b and 0 or a < b and -1 or 1
end
local function compareIds(selfId, otherId)
if not selfId and not otherId then return 0
elseif not selfId then return 1
elseif not otherId then return -1
end
local selfNumber, otherNumber = tonumber(selfId), tonumber(otherId)
if selfNumber and otherNumber then -- numerical comparison
return compare(selfNumber, otherNumber)
elseif selfNumber then -- numericals are always smaller than alphanums
return -1
else
return compare(selfId, otherId) -- alphanumerical comparison
end
end
local function smallerPrereleaseOrBuild(mine, his)
if mine == his then return false end
local myIds, hisIds = splitByDot(mine), splitByDot(his)
local myLength = #myIds
local comparison
for i = 1, myLength do
comparison = compareIds(myIds[i], hisIds[i])
if comparison ~= 0 then return comparison == -1 end
-- if comparison == 0, continue loop
end
return myLength < #hisIds
end
local methods = {}
function methods:nextMajor()
return version(self.major + 1, 0, 0)
end
function methods:nextMinor()
return version(self.major, self.minor + 1, 0)
end
function methods:nextPatch()
return version(self.major, self.minor, self.patch + 1)
end
local mt = { __index = methods }
function mt:__eq(other)
return self.major == other.major and
self.minor == other.minor and
self.patch == other.patch and
self.prerelease == other.prerelease and
self.build == other.build
end
function mt:__lt(other)
return self.major < other.major or
self.minor < other.minor or
self.patch < other.patch or
(self.prerelease and not other.prerelease) or
smallerPrereleaseOrBuild(self.prerelease, other.prerelease) or
(not self.build and other.build) or
smallerPrereleaseOrBuild(self.build, other.build)
end
function mt:__pow(other)
return self.major == other.major and
self.minor <= other.minor
end
function mt:__tostring()
local buffer = { ("%d.%d.%d"):format(self.major, self.minor, self.patch) }
if self.prerelease then table.insert(buffer, "-" .. self.prerelease) end
if self.build then table.insert(buffer, "+" .. self.build) end
return table.concat(buffer)
end
local function new(major, minor, patch, prerelease, build)
assert(major, "At least one parameter is needed")
if type(major) == 'string' then
major,minor,patch,prerelease,build = parseVersion(major)
end
patch = patch or 0
minor = minor or 0
checkPositiveInteger(major, "major")
checkPositiveInteger(minor, "minor")
checkPositiveInteger(patch, "patch")
local result = {major=major, minor=minor, patch=patch, prerelease=prerelease, build=build}
return setmetatable(result, mt)
end
setmetatable(version, { __call = function(_, ...) return new(...) end })
version._VERSION = version('1.1.0')
return version
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