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(The MIT License)
Copyright (c) 2014-2018 Douglas Christopher Wilson
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.

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'use strict'
const Range = require('../classes/range.js')
const Comparator = require('../classes/comparator.js')
const { ANY } = Comparator
const satisfies = require('../functions/satisfies.js')
const compare = require('../functions/compare.js')
// Complex range `r1 || r2 || ...` is a subset of `R1 || R2 || ...` iff:
// - Every simple range `r1, r2, ...` is a null set, OR
// - Every simple range `r1, r2, ...` which is not a null set is a subset of
// some `R1, R2, ...`
//
// Simple range `c1 c2 ...` is a subset of simple range `C1 C2 ...` iff:
// - If c is only the ANY comparator
// - If C is only the ANY comparator, return true
// - Else if in prerelease mode, return false
// - else replace c with `[>=0.0.0]`
// - If C is only the ANY comparator
// - if in prerelease mode, return true
// - else replace C with `[>=0.0.0]`
// - Let EQ be the set of = comparators in c
// - If EQ is more than one, return true (null set)
// - Let GT be the highest > or >= comparator in c
// - Let LT be the lowest < or <= comparator in c
// - If GT and LT, and GT.semver > LT.semver, return true (null set)
// - If any C is a = range, and GT or LT are set, return false
// - If EQ
// - If GT, and EQ does not satisfy GT, return true (null set)
// - If LT, and EQ does not satisfy LT, return true (null set)
// - If EQ satisfies every C, return true
// - Else return false
// - If GT
// - If GT.semver is lower than any > or >= comp in C, return false
// - If GT is >=, and GT.semver does not satisfy every C, return false
// - If GT.semver has a prerelease, and not in prerelease mode
// - If no C has a prerelease and the GT.semver tuple, return false
// - If LT
// - If LT.semver is greater than any < or <= comp in C, return false
// - If LT is <=, and LT.semver does not satisfy every C, return false
// - If GT.semver has a prerelease, and not in prerelease mode
// - If no C has a prerelease and the LT.semver tuple, return false
// - Else return true
const subset = (sub, dom, options = {}) => {
if (sub === dom) {
return true
}
sub = new Range(sub, options)
dom = new Range(dom, options)
let sawNonNull = false
OUTER: for (const simpleSub of sub.set) {
for (const simpleDom of dom.set) {
const isSub = simpleSubset(simpleSub, simpleDom, options)
sawNonNull = sawNonNull || isSub !== null
if (isSub) {
continue OUTER
}
}
// the null set is a subset of everything, but null simple ranges in
// a complex range should be ignored. so if we saw a non-null range,
// then we know this isn't a subset, but if EVERY simple range was null,
// then it is a subset.
if (sawNonNull) {
return false
}
}
return true
}
const minimumVersionWithPreRelease = [new Comparator('>=0.0.0-0')]
const minimumVersion = [new Comparator('>=0.0.0')]
const simpleSubset = (sub, dom, options) => {
if (sub === dom) {
return true
}
if (sub.length === 1 && sub[0].semver === ANY) {
if (dom.length === 1 && dom[0].semver === ANY) {
return true
} else if (options.includePrerelease) {
sub = minimumVersionWithPreRelease
} else {
sub = minimumVersion
}
}
if (dom.length === 1 && dom[0].semver === ANY) {
if (options.includePrerelease) {
return true
} else {
dom = minimumVersion
}
}
const eqSet = new Set()
let gt, lt
for (const c of sub) {
if (c.operator === '>' || c.operator === '>=') {
gt = higherGT(gt, c, options)
} else if (c.operator === '<' || c.operator === '<=') {
lt = lowerLT(lt, c, options)
} else {
eqSet.add(c.semver)
}
}
if (eqSet.size > 1) {
return null
}
let gtltComp
if (gt && lt) {
gtltComp = compare(gt.semver, lt.semver, options)
if (gtltComp > 0) {
return null
} else if (gtltComp === 0 && (gt.operator !== '>=' || lt.operator !== '<=')) {
return null
}
}
// will iterate one or zero times
for (const eq of eqSet) {
if (gt && !satisfies(eq, String(gt), options)) {
return null
}
if (lt && !satisfies(eq, String(lt), options)) {
return null
}
for (const c of dom) {
if (!satisfies(eq, String(c), options)) {
return false
}
}
return true
}
let higher, lower
let hasDomLT, hasDomGT
// if the subset has a prerelease, we need a comparator in the superset
// with the same tuple and a prerelease, or it's not a subset
let needDomLTPre = lt &&
!options.includePrerelease &&
lt.semver.prerelease.length ? lt.semver : false
let needDomGTPre = gt &&
!options.includePrerelease &&
gt.semver.prerelease.length ? gt.semver : false
// exception: <1.2.3-0 is the same as <1.2.3
if (needDomLTPre && needDomLTPre.prerelease.length === 1 &&
lt.operator === '<' && needDomLTPre.prerelease[0] === 0) {
needDomLTPre = false
}
for (const c of dom) {
hasDomGT = hasDomGT || c.operator === '>' || c.operator === '>='
hasDomLT = hasDomLT || c.operator === '<' || c.operator === '<='
if (gt) {
if (needDomGTPre) {
if (c.semver.prerelease && c.semver.prerelease.length &&
c.semver.major === needDomGTPre.major &&
c.semver.minor === needDomGTPre.minor &&
c.semver.patch === needDomGTPre.patch) {
needDomGTPre = false
}
}
if (c.operator === '>' || c.operator === '>=') {
higher = higherGT(gt, c, options)
if (higher === c && higher !== gt) {
return false
}
} else if (gt.operator === '>=' && !satisfies(gt.semver, String(c), options)) {
return false
}
}
if (lt) {
if (needDomLTPre) {
if (c.semver.prerelease && c.semver.prerelease.length &&
c.semver.major === needDomLTPre.major &&
c.semver.minor === needDomLTPre.minor &&
c.semver.patch === needDomLTPre.patch) {
needDomLTPre = false
}
}
if (c.operator === '<' || c.operator === '<=') {
lower = lowerLT(lt, c, options)
if (lower === c && lower !== lt) {
return false
}
} else if (lt.operator === '<=' && !satisfies(lt.semver, String(c), options)) {
return false
}
}
if (!c.operator && (lt || gt) && gtltComp !== 0) {
return false
}
}
// if there was a < or >, and nothing in the dom, then must be false
// UNLESS it was limited by another range in the other direction.
// Eg, >1.0.0 <1.0.1 is still a subset of <2.0.0
if (gt && hasDomLT && !lt && gtltComp !== 0) {
return false
}
if (lt && hasDomGT && !gt && gtltComp !== 0) {
return false
}
// we needed a prerelease range in a specific tuple, but didn't get one
// then this isn't a subset. eg >=1.2.3-pre is not a subset of >=1.0.0,
// because it includes prereleases in the 1.2.3 tuple
if (needDomGTPre || needDomLTPre) {
return false
}
return true
}
// >=1.2.3 is lower than >1.2.3
const higherGT = (a, b, options) => {
if (!a) {
return b
}
const comp = compare(a.semver, b.semver, options)
return comp > 0 ? a
: comp < 0 ? b
: b.operator === '>' && a.operator === '>=' ? b
: a
}
// <=1.2.3 is higher than <1.2.3
const lowerLT = (a, b, options) => {
if (!a) {
return b
}
const comp = compare(a.semver, b.semver, options)
return comp < 0 ? a
: comp > 0 ? b
: b.operator === '<' && a.operator === '<=' ? b
: a
}
module.exports = subset