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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
 
 
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