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Tree: d2f2697f296dd39aed6a8b63c6d04a736a7db5b3

Files: d2f2697f296dd39aed6a8b63c6d04a736a7db5b3 / node_modules / semver / semver.js

42130 bytesRaw
1exports = module.exports = SemVer
2
3var debug
4/* istanbul ignore next */
5if (typeof process === 'object' &&
6    process.env &&
7    process.env.NODE_DEBUG &&
8    /\bsemver\b/i.test(process.env.NODE_DEBUG)) {
9  debug = function () {
10    var args = Array.prototype.slice.call(arguments, 0)
11    args.unshift('SEMVER')
12    console.log.apply(console, args)
13  }
14} else {
15  debug = function () {}
16}
17
18// Note: this is the semver.org version of the spec that it implements
19// Not necessarily the package version of this code.
20exports.SEMVER_SPEC_VERSION = '2.0.0'
21
22var MAX_LENGTH = 256
23var MAX_SAFE_INTEGER = Number.MAX_SAFE_INTEGER ||
24  /* istanbul ignore next */ 9007199254740991
25
26// Max safe segment length for coercion.
27var MAX_SAFE_COMPONENT_LENGTH = 16
28
29// The actual regexps go on exports.re
30var re = exports.re = []
31var src = exports.src = []
32var t = exports.tokens = {}
33var R = 0
34
35function tok (n) {
36  t[n] = R++
37}
38
39// The following Regular Expressions can be used for tokenizing,
40// validating, and parsing SemVer version strings.
41
42// ## Numeric Identifier
43// A single `0`, or a non-zero digit followed by zero or more digits.
44
45tok('NUMERICIDENTIFIER')
46src[t.NUMERICIDENTIFIER] = '0|[1-9]\\d*'
47tok('NUMERICIDENTIFIERLOOSE')
48src[t.NUMERICIDENTIFIERLOOSE] = '[0-9]+'
49
50// ## Non-numeric Identifier
51// Zero or more digits, followed by a letter or hyphen, and then zero or
52// more letters, digits, or hyphens.
53
54tok('NONNUMERICIDENTIFIER')
55src[t.NONNUMERICIDENTIFIER] = '\\d*[a-zA-Z-][a-zA-Z0-9-]*'
56
57// ## Main Version
58// Three dot-separated numeric identifiers.
59
60tok('MAINVERSION')
61src[t.MAINVERSION] = '(' + src[t.NUMERICIDENTIFIER] + ')\\.' +
62                   '(' + src[t.NUMERICIDENTIFIER] + ')\\.' +
63                   '(' + src[t.NUMERICIDENTIFIER] + ')'
64
65tok('MAINVERSIONLOOSE')
66src[t.MAINVERSIONLOOSE] = '(' + src[t.NUMERICIDENTIFIERLOOSE] + ')\\.' +
67                        '(' + src[t.NUMERICIDENTIFIERLOOSE] + ')\\.' +
68                        '(' + src[t.NUMERICIDENTIFIERLOOSE] + ')'
69
70// ## Pre-release Version Identifier
71// A numeric identifier, or a non-numeric identifier.
72
73tok('PRERELEASEIDENTIFIER')
74src[t.PRERELEASEIDENTIFIER] = '(?:' + src[t.NUMERICIDENTIFIER] +
75                            '|' + src[t.NONNUMERICIDENTIFIER] + ')'
76
77tok('PRERELEASEIDENTIFIERLOOSE')
78src[t.PRERELEASEIDENTIFIERLOOSE] = '(?:' + src[t.NUMERICIDENTIFIERLOOSE] +
79                                 '|' + src[t.NONNUMERICIDENTIFIER] + ')'
80
81// ## Pre-release Version
82// Hyphen, followed by one or more dot-separated pre-release version
83// identifiers.
84
85tok('PRERELEASE')
86src[t.PRERELEASE] = '(?:-(' + src[t.PRERELEASEIDENTIFIER] +
87                  '(?:\\.' + src[t.PRERELEASEIDENTIFIER] + ')*))'
88
89tok('PRERELEASELOOSE')
90src[t.PRERELEASELOOSE] = '(?:-?(' + src[t.PRERELEASEIDENTIFIERLOOSE] +
91                       '(?:\\.' + src[t.PRERELEASEIDENTIFIERLOOSE] + ')*))'
92
93// ## Build Metadata Identifier
94// Any combination of digits, letters, or hyphens.
95
96tok('BUILDIDENTIFIER')
97src[t.BUILDIDENTIFIER] = '[0-9A-Za-z-]+'
98
99// ## Build Metadata
100// Plus sign, followed by one or more period-separated build metadata
101// identifiers.
102
103tok('BUILD')
104src[t.BUILD] = '(?:\\+(' + src[t.BUILDIDENTIFIER] +
105             '(?:\\.' + src[t.BUILDIDENTIFIER] + ')*))'
106
107// ## Full Version String
108// A main version, followed optionally by a pre-release version and
109// build metadata.
110
111// Note that the only major, minor, patch, and pre-release sections of
112// the version string are capturing groups.  The build metadata is not a
113// capturing group, because it should not ever be used in version
114// comparison.
115
116tok('FULL')
117tok('FULLPLAIN')
118src[t.FULLPLAIN] = 'v?' + src[t.MAINVERSION] +
119                  src[t.PRERELEASE] + '?' +
120                  src[t.BUILD] + '?'
121
122src[t.FULL] = '^' + src[t.FULLPLAIN] + '$'
123
124// like full, but allows v1.2.3 and =1.2.3, which people do sometimes.
125// also, 1.0.0alpha1 (prerelease without the hyphen) which is pretty
126// common in the npm registry.
127tok('LOOSEPLAIN')
128src[t.LOOSEPLAIN] = '[v=\\s]*' + src[t.MAINVERSIONLOOSE] +
129                  src[t.PRERELEASELOOSE] + '?' +
130                  src[t.BUILD] + '?'
131
132tok('LOOSE')
133src[t.LOOSE] = '^' + src[t.LOOSEPLAIN] + '$'
134
135tok('GTLT')
136src[t.GTLT] = '((?:<|>)?=?)'
137
138// Something like "2.*" or "1.2.x".
139// Note that "x.x" is a valid xRange identifer, meaning "any version"
140// Only the first item is strictly required.
141tok('XRANGEIDENTIFIERLOOSE')
142src[t.XRANGEIDENTIFIERLOOSE] = src[t.NUMERICIDENTIFIERLOOSE] + '|x|X|\\*'
143tok('XRANGEIDENTIFIER')
144src[t.XRANGEIDENTIFIER] = src[t.NUMERICIDENTIFIER] + '|x|X|\\*'
145
146tok('XRANGEPLAIN')
147src[t.XRANGEPLAIN] = '[v=\\s]*(' + src[t.XRANGEIDENTIFIER] + ')' +
148                   '(?:\\.(' + src[t.XRANGEIDENTIFIER] + ')' +
149                   '(?:\\.(' + src[t.XRANGEIDENTIFIER] + ')' +
150                   '(?:' + src[t.PRERELEASE] + ')?' +
151                   src[t.BUILD] + '?' +
152                   ')?)?'
153
154tok('XRANGEPLAINLOOSE')
155src[t.XRANGEPLAINLOOSE] = '[v=\\s]*(' + src[t.XRANGEIDENTIFIERLOOSE] + ')' +
156                        '(?:\\.(' + src[t.XRANGEIDENTIFIERLOOSE] + ')' +
157                        '(?:\\.(' + src[t.XRANGEIDENTIFIERLOOSE] + ')' +
158                        '(?:' + src[t.PRERELEASELOOSE] + ')?' +
159                        src[t.BUILD] + '?' +
160                        ')?)?'
161
162tok('XRANGE')
163src[t.XRANGE] = '^' + src[t.GTLT] + '\\s*' + src[t.XRANGEPLAIN] + '$'
164tok('XRANGELOOSE')
165src[t.XRANGELOOSE] = '^' + src[t.GTLT] + '\\s*' + src[t.XRANGEPLAINLOOSE] + '$'
166
167// Coercion.
168// Extract anything that could conceivably be a part of a valid semver
169tok('COERCE')
170src[t.COERCE] = '(^|[^\\d])' +
171              '(\\d{1,' + MAX_SAFE_COMPONENT_LENGTH + '})' +
172              '(?:\\.(\\d{1,' + MAX_SAFE_COMPONENT_LENGTH + '}))?' +
173              '(?:\\.(\\d{1,' + MAX_SAFE_COMPONENT_LENGTH + '}))?' +
174              '(?:$|[^\\d])'
175tok('COERCERTL')
176re[t.COERCERTL] = new RegExp(src[t.COERCE], 'g')
177
178// Tilde ranges.
179// Meaning is "reasonably at or greater than"
180tok('LONETILDE')
181src[t.LONETILDE] = '(?:~>?)'
182
183tok('TILDETRIM')
184src[t.TILDETRIM] = '(\\s*)' + src[t.LONETILDE] + '\\s+'
185re[t.TILDETRIM] = new RegExp(src[t.TILDETRIM], 'g')
186var tildeTrimReplace = '$1~'
187
188tok('TILDE')
189src[t.TILDE] = '^' + src[t.LONETILDE] + src[t.XRANGEPLAIN] + '$'
190tok('TILDELOOSE')
191src[t.TILDELOOSE] = '^' + src[t.LONETILDE] + src[t.XRANGEPLAINLOOSE] + '$'
192
193// Caret ranges.
194// Meaning is "at least and backwards compatible with"
195tok('LONECARET')
196src[t.LONECARET] = '(?:\\^)'
197
198tok('CARETTRIM')
199src[t.CARETTRIM] = '(\\s*)' + src[t.LONECARET] + '\\s+'
200re[t.CARETTRIM] = new RegExp(src[t.CARETTRIM], 'g')
201var caretTrimReplace = '$1^'
202
203tok('CARET')
204src[t.CARET] = '^' + src[t.LONECARET] + src[t.XRANGEPLAIN] + '$'
205tok('CARETLOOSE')
206src[t.CARETLOOSE] = '^' + src[t.LONECARET] + src[t.XRANGEPLAINLOOSE] + '$'
207
208// A simple gt/lt/eq thing, or just "" to indicate "any version"
209tok('COMPARATORLOOSE')
210src[t.COMPARATORLOOSE] = '^' + src[t.GTLT] + '\\s*(' + src[t.LOOSEPLAIN] + ')$|^$'
211tok('COMPARATOR')
212src[t.COMPARATOR] = '^' + src[t.GTLT] + '\\s*(' + src[t.FULLPLAIN] + ')$|^$'
213
214// An expression to strip any whitespace between the gtlt and the thing
215// it modifies, so that `> 1.2.3` ==> `>1.2.3`
216tok('COMPARATORTRIM')
217src[t.COMPARATORTRIM] = '(\\s*)' + src[t.GTLT] +
218                      '\\s*(' + src[t.LOOSEPLAIN] + '|' + src[t.XRANGEPLAIN] + ')'
219
220// this one has to use the /g flag
221re[t.COMPARATORTRIM] = new RegExp(src[t.COMPARATORTRIM], 'g')
222var comparatorTrimReplace = '$1$2$3'
223
224// Something like `1.2.3 - 1.2.4`
225// Note that these all use the loose form, because they'll be
226// checked against either the strict or loose comparator form
227// later.
228tok('HYPHENRANGE')
229src[t.HYPHENRANGE] = '^\\s*(' + src[t.XRANGEPLAIN] + ')' +
230                   '\\s+-\\s+' +
231                   '(' + src[t.XRANGEPLAIN] + ')' +
232                   '\\s*$'
233
234tok('HYPHENRANGELOOSE')
235src[t.HYPHENRANGELOOSE] = '^\\s*(' + src[t.XRANGEPLAINLOOSE] + ')' +
236                        '\\s+-\\s+' +
237                        '(' + src[t.XRANGEPLAINLOOSE] + ')' +
238                        '\\s*$'
239
240// Star ranges basically just allow anything at all.
241tok('STAR')
242src[t.STAR] = '(<|>)?=?\\s*\\*'
243
244// Compile to actual regexp objects.
245// All are flag-free, unless they were created above with a flag.
246for (var i = 0; i < R; i++) {
247  debug(i, src[i])
248  if (!re[i]) {
249    re[i] = new RegExp(src[i])
250  }
251}
252
253exports.parse = parse
254function parse (version, options) {
255  if (!options || typeof options !== 'object') {
256    options = {
257      loose: !!options,
258      includePrerelease: false
259    }
260  }
261
262  if (version instanceof SemVer) {
263    return version
264  }
265
266  if (typeof version !== 'string') {
267    return null
268  }
269
270  if (version.length > MAX_LENGTH) {
271    return null
272  }
273
274  var r = options.loose ? re[t.LOOSE] : re[t.FULL]
275  if (!r.test(version)) {
276    return null
277  }
278
279  try {
280    return new SemVer(version, options)
281  } catch (er) {
282    return null
283  }
284}
285
286exports.valid = valid
287function valid (version, options) {
288  var v = parse(version, options)
289  return v ? v.version : null
290}
291
292exports.clean = clean
293function clean (version, options) {
294  var s = parse(version.trim().replace(/^[=v]+/, ''), options)
295  return s ? s.version : null
296}
297
298exports.SemVer = SemVer
299
300function SemVer (version, options) {
301  if (!options || typeof options !== 'object') {
302    options = {
303      loose: !!options,
304      includePrerelease: false
305    }
306  }
307  if (version instanceof SemVer) {
308    if (version.loose === options.loose) {
309      return version
310    } else {
311      version = version.version
312    }
313  } else if (typeof version !== 'string') {
314    throw new TypeError('Invalid Version: ' + version)
315  }
316
317  if (version.length > MAX_LENGTH) {
318    throw new TypeError('version is longer than ' + MAX_LENGTH + ' characters')
319  }
320
321  if (!(this instanceof SemVer)) {
322    return new SemVer(version, options)
323  }
324
325  debug('SemVer', version, options)
326  this.options = options
327  this.loose = !!options.loose
328
329  var m = version.trim().match(options.loose ? re[t.LOOSE] : re[t.FULL])
330
331  if (!m) {
332    throw new TypeError('Invalid Version: ' + version)
333  }
334
335  this.raw = version
336
337  // these are actually numbers
338  this.major = +m[1]
339  this.minor = +m[2]
340  this.patch = +m[3]
341
342  if (this.major > MAX_SAFE_INTEGER || this.major < 0) {
343    throw new TypeError('Invalid major version')
344  }
345
346  if (this.minor > MAX_SAFE_INTEGER || this.minor < 0) {
347    throw new TypeError('Invalid minor version')
348  }
349
350  if (this.patch > MAX_SAFE_INTEGER || this.patch < 0) {
351    throw new TypeError('Invalid patch version')
352  }
353
354  // numberify any prerelease numeric ids
355  if (!m[4]) {
356    this.prerelease = []
357  } else {
358    this.prerelease = m[4].split('.').map(function (id) {
359      if (/^[0-9]+$/.test(id)) {
360        var num = +id
361        if (num >= 0 && num < MAX_SAFE_INTEGER) {
362          return num
363        }
364      }
365      return id
366    })
367  }
368
369  this.build = m[5] ? m[5].split('.') : []
370  this.format()
371}
372
373SemVer.prototype.format = function () {
374  this.version = this.major + '.' + this.minor + '.' + this.patch
375  if (this.prerelease.length) {
376    this.version += '-' + this.prerelease.join('.')
377  }
378  return this.version
379}
380
381SemVer.prototype.toString = function () {
382  return this.version
383}
384
385SemVer.prototype.compare = function (other) {
386  debug('SemVer.compare', this.version, this.options, other)
387  if (!(other instanceof SemVer)) {
388    other = new SemVer(other, this.options)
389  }
390
391  return this.compareMain(other) || this.comparePre(other)
392}
393
394SemVer.prototype.compareMain = function (other) {
395  if (!(other instanceof SemVer)) {
396    other = new SemVer(other, this.options)
397  }
398
399  return compareIdentifiers(this.major, other.major) ||
400         compareIdentifiers(this.minor, other.minor) ||
401         compareIdentifiers(this.patch, other.patch)
402}
403
404SemVer.prototype.comparePre = function (other) {
405  if (!(other instanceof SemVer)) {
406    other = new SemVer(other, this.options)
407  }
408
409  // NOT having a prerelease is > having one
410  if (this.prerelease.length && !other.prerelease.length) {
411    return -1
412  } else if (!this.prerelease.length && other.prerelease.length) {
413    return 1
414  } else if (!this.prerelease.length && !other.prerelease.length) {
415    return 0
416  }
417
418  var i = 0
419  do {
420    var a = this.prerelease[i]
421    var b = other.prerelease[i]
422    debug('prerelease compare', i, a, b)
423    if (a === undefined && b === undefined) {
424      return 0
425    } else if (b === undefined) {
426      return 1
427    } else if (a === undefined) {
428      return -1
429    } else if (a === b) {
430      continue
431    } else {
432      return compareIdentifiers(a, b)
433    }
434  } while (++i)
435}
436
437SemVer.prototype.compareBuild = function (other) {
438  if (!(other instanceof SemVer)) {
439    other = new SemVer(other, this.options)
440  }
441
442  var i = 0
443  do {
444    var a = this.build[i]
445    var b = other.build[i]
446    debug('prerelease compare', i, a, b)
447    if (a === undefined && b === undefined) {
448      return 0
449    } else if (b === undefined) {
450      return 1
451    } else if (a === undefined) {
452      return -1
453    } else if (a === b) {
454      continue
455    } else {
456      return compareIdentifiers(a, b)
457    }
458  } while (++i)
459}
460
461// preminor will bump the version up to the next minor release, and immediately
462// down to pre-release. premajor and prepatch work the same way.
463SemVer.prototype.inc = function (release, identifier) {
464  switch (release) {
465    case 'premajor':
466      this.prerelease.length = 0
467      this.patch = 0
468      this.minor = 0
469      this.major++
470      this.inc('pre', identifier)
471      break
472    case 'preminor':
473      this.prerelease.length = 0
474      this.patch = 0
475      this.minor++
476      this.inc('pre', identifier)
477      break
478    case 'prepatch':
479      // If this is already a prerelease, it will bump to the next version
480      // drop any prereleases that might already exist, since they are not
481      // relevant at this point.
482      this.prerelease.length = 0
483      this.inc('patch', identifier)
484      this.inc('pre', identifier)
485      break
486    // If the input is a non-prerelease version, this acts the same as
487    // prepatch.
488    case 'prerelease':
489      if (this.prerelease.length === 0) {
490        this.inc('patch', identifier)
491      }
492      this.inc('pre', identifier)
493      break
494
495    case 'major':
496      // If this is a pre-major version, bump up to the same major version.
497      // Otherwise increment major.
498      // 1.0.0-5 bumps to 1.0.0
499      // 1.1.0 bumps to 2.0.0
500      if (this.minor !== 0 ||
501          this.patch !== 0 ||
502          this.prerelease.length === 0) {
503        this.major++
504      }
505      this.minor = 0
506      this.patch = 0
507      this.prerelease = []
508      break
509    case 'minor':
510      // If this is a pre-minor version, bump up to the same minor version.
511      // Otherwise increment minor.
512      // 1.2.0-5 bumps to 1.2.0
513      // 1.2.1 bumps to 1.3.0
514      if (this.patch !== 0 || this.prerelease.length === 0) {
515        this.minor++
516      }
517      this.patch = 0
518      this.prerelease = []
519      break
520    case 'patch':
521      // If this is not a pre-release version, it will increment the patch.
522      // If it is a pre-release it will bump up to the same patch version.
523      // 1.2.0-5 patches to 1.2.0
524      // 1.2.0 patches to 1.2.1
525      if (this.prerelease.length === 0) {
526        this.patch++
527      }
528      this.prerelease = []
529      break
530    // This probably shouldn't be used publicly.
531    // 1.0.0 "pre" would become 1.0.0-0 which is the wrong direction.
532    case 'pre':
533      if (this.prerelease.length === 0) {
534        this.prerelease = [0]
535      } else {
536        var i = this.prerelease.length
537        while (--i >= 0) {
538          if (typeof this.prerelease[i] === 'number') {
539            this.prerelease[i]++
540            i = -2
541          }
542        }
543        if (i === -1) {
544          // didn't increment anything
545          this.prerelease.push(0)
546        }
547      }
548      if (identifier) {
549        // 1.2.0-beta.1 bumps to 1.2.0-beta.2,
550        // 1.2.0-beta.fooblz or 1.2.0-beta bumps to 1.2.0-beta.0
551        if (this.prerelease[0] === identifier) {
552          if (isNaN(this.prerelease[1])) {
553            this.prerelease = [identifier, 0]
554          }
555        } else {
556          this.prerelease = [identifier, 0]
557        }
558      }
559      break
560
561    default:
562      throw new Error('invalid increment argument: ' + release)
563  }
564  this.format()
565  this.raw = this.version
566  return this
567}
568
569exports.inc = inc
570function inc (version, release, loose, identifier) {
571  if (typeof (loose) === 'string') {
572    identifier = loose
573    loose = undefined
574  }
575
576  try {
577    return new SemVer(version, loose).inc(release, identifier).version
578  } catch (er) {
579    return null
580  }
581}
582
583exports.diff = diff
584function diff (version1, version2) {
585  if (eq(version1, version2)) {
586    return null
587  } else {
588    var v1 = parse(version1)
589    var v2 = parse(version2)
590    var prefix = ''
591    if (v1.prerelease.length || v2.prerelease.length) {
592      prefix = 'pre'
593      var defaultResult = 'prerelease'
594    }
595    for (var key in v1) {
596      if (key === 'major' || key === 'minor' || key === 'patch') {
597        if (v1[key] !== v2[key]) {
598          return prefix + key
599        }
600      }
601    }
602    return defaultResult // may be undefined
603  }
604}
605
606exports.compareIdentifiers = compareIdentifiers
607
608var numeric = /^[0-9]+$/
609function compareIdentifiers (a, b) {
610  var anum = numeric.test(a)
611  var bnum = numeric.test(b)
612
613  if (anum && bnum) {
614    a = +a
615    b = +b
616  }
617
618  return a === b ? 0
619    : (anum && !bnum) ? -1
620    : (bnum && !anum) ? 1
621    : a < b ? -1
622    : 1
623}
624
625exports.rcompareIdentifiers = rcompareIdentifiers
626function rcompareIdentifiers (a, b) {
627  return compareIdentifiers(b, a)
628}
629
630exports.major = major
631function major (a, loose) {
632  return new SemVer(a, loose).major
633}
634
635exports.minor = minor
636function minor (a, loose) {
637  return new SemVer(a, loose).minor
638}
639
640exports.patch = patch
641function patch (a, loose) {
642  return new SemVer(a, loose).patch
643}
644
645exports.compare = compare
646function compare (a, b, loose) {
647  return new SemVer(a, loose).compare(new SemVer(b, loose))
648}
649
650exports.compareLoose = compareLoose
651function compareLoose (a, b) {
652  return compare(a, b, true)
653}
654
655exports.compareBuild = compareBuild
656function compareBuild (a, b, loose) {
657  var versionA = new SemVer(a, loose)
658  var versionB = new SemVer(b, loose)
659  return versionA.compare(versionB) || versionA.compareBuild(versionB)
660}
661
662exports.rcompare = rcompare
663function rcompare (a, b, loose) {
664  return compare(b, a, loose)
665}
666
667exports.sort = sort
668function sort (list, loose) {
669  return list.sort(function (a, b) {
670    return exports.compareBuild(a, b, loose)
671  })
672}
673
674exports.rsort = rsort
675function rsort (list, loose) {
676  return list.sort(function (a, b) {
677    return exports.compareBuild(b, a, loose)
678  })
679}
680
681exports.gt = gt
682function gt (a, b, loose) {
683  return compare(a, b, loose) > 0
684}
685
686exports.lt = lt
687function lt (a, b, loose) {
688  return compare(a, b, loose) < 0
689}
690
691exports.eq = eq
692function eq (a, b, loose) {
693  return compare(a, b, loose) === 0
694}
695
696exports.neq = neq
697function neq (a, b, loose) {
698  return compare(a, b, loose) !== 0
699}
700
701exports.gte = gte
702function gte (a, b, loose) {
703  return compare(a, b, loose) >= 0
704}
705
706exports.lte = lte
707function lte (a, b, loose) {
708  return compare(a, b, loose) <= 0
709}
710
711exports.cmp = cmp
712function cmp (a, op, b, loose) {
713  switch (op) {
714    case '===':
715      if (typeof a === 'object')
716        a = a.version
717      if (typeof b === 'object')
718        b = b.version
719      return a === b
720
721    case '!==':
722      if (typeof a === 'object')
723        a = a.version
724      if (typeof b === 'object')
725        b = b.version
726      return a !== b
727
728    case '':
729    case '=':
730    case '==':
731      return eq(a, b, loose)
732
733    case '!=':
734      return neq(a, b, loose)
735
736    case '>':
737      return gt(a, b, loose)
738
739    case '>=':
740      return gte(a, b, loose)
741
742    case '<':
743      return lt(a, b, loose)
744
745    case '<=':
746      return lte(a, b, loose)
747
748    default:
749      throw new TypeError('Invalid operator: ' + op)
750  }
751}
752
753exports.Comparator = Comparator
754function Comparator (comp, options) {
755  if (!options || typeof options !== 'object') {
756    options = {
757      loose: !!options,
758      includePrerelease: false
759    }
760  }
761
762  if (comp instanceof Comparator) {
763    if (comp.loose === !!options.loose) {
764      return comp
765    } else {
766      comp = comp.value
767    }
768  }
769
770  if (!(this instanceof Comparator)) {
771    return new Comparator(comp, options)
772  }
773
774  debug('comparator', comp, options)
775  this.options = options
776  this.loose = !!options.loose
777  this.parse(comp)
778
779  if (this.semver === ANY) {
780    this.value = ''
781  } else {
782    this.value = this.operator + this.semver.version
783  }
784
785  debug('comp', this)
786}
787
788var ANY = {}
789Comparator.prototype.parse = function (comp) {
790  var r = this.options.loose ? re[t.COMPARATORLOOSE] : re[t.COMPARATOR]
791  var m = comp.match(r)
792
793  if (!m) {
794    throw new TypeError('Invalid comparator: ' + comp)
795  }
796
797  this.operator = m[1] !== undefined ? m[1] : ''
798  if (this.operator === '=') {
799    this.operator = ''
800  }
801
802  // if it literally is just '>' or '' then allow anything.
803  if (!m[2]) {
804    this.semver = ANY
805  } else {
806    this.semver = new SemVer(m[2], this.options.loose)
807  }
808}
809
810Comparator.prototype.toString = function () {
811  return this.value
812}
813
814Comparator.prototype.test = function (version) {
815  debug('Comparator.test', version, this.options.loose)
816
817  if (this.semver === ANY || version === ANY) {
818    return true
819  }
820
821  if (typeof version === 'string') {
822    try {
823      version = new SemVer(version, this.options)
824    } catch (er) {
825      return false
826    }
827  }
828
829  return cmp(version, this.operator, this.semver, this.options)
830}
831
832Comparator.prototype.intersects = function (comp, options) {
833  if (!(comp instanceof Comparator)) {
834    throw new TypeError('a Comparator is required')
835  }
836
837  if (!options || typeof options !== 'object') {
838    options = {
839      loose: !!options,
840      includePrerelease: false
841    }
842  }
843
844  var rangeTmp
845
846  if (this.operator === '') {
847    if (this.value === '') {
848      return true
849    }
850    rangeTmp = new Range(comp.value, options)
851    return satisfies(this.value, rangeTmp, options)
852  } else if (comp.operator === '') {
853    if (comp.value === '') {
854      return true
855    }
856    rangeTmp = new Range(this.value, options)
857    return satisfies(comp.semver, rangeTmp, options)
858  }
859
860  var sameDirectionIncreasing =
861    (this.operator === '>=' || this.operator === '>') &&
862    (comp.operator === '>=' || comp.operator === '>')
863  var sameDirectionDecreasing =
864    (this.operator === '<=' || this.operator === '<') &&
865    (comp.operator === '<=' || comp.operator === '<')
866  var sameSemVer = this.semver.version === comp.semver.version
867  var differentDirectionsInclusive =
868    (this.operator === '>=' || this.operator === '<=') &&
869    (comp.operator === '>=' || comp.operator === '<=')
870  var oppositeDirectionsLessThan =
871    cmp(this.semver, '<', comp.semver, options) &&
872    ((this.operator === '>=' || this.operator === '>') &&
873    (comp.operator === '<=' || comp.operator === '<'))
874  var oppositeDirectionsGreaterThan =
875    cmp(this.semver, '>', comp.semver, options) &&
876    ((this.operator === '<=' || this.operator === '<') &&
877    (comp.operator === '>=' || comp.operator === '>'))
878
879  return sameDirectionIncreasing || sameDirectionDecreasing ||
880    (sameSemVer && differentDirectionsInclusive) ||
881    oppositeDirectionsLessThan || oppositeDirectionsGreaterThan
882}
883
884exports.Range = Range
885function Range (range, options) {
886  if (!options || typeof options !== 'object') {
887    options = {
888      loose: !!options,
889      includePrerelease: false
890    }
891  }
892
893  if (range instanceof Range) {
894    if (range.loose === !!options.loose &&
895        range.includePrerelease === !!options.includePrerelease) {
896      return range
897    } else {
898      return new Range(range.raw, options)
899    }
900  }
901
902  if (range instanceof Comparator) {
903    return new Range(range.value, options)
904  }
905
906  if (!(this instanceof Range)) {
907    return new Range(range, options)
908  }
909
910  this.options = options
911  this.loose = !!options.loose
912  this.includePrerelease = !!options.includePrerelease
913
914  // First, split based on boolean or ||
915  this.raw = range
916  this.set = range.split(/\s*\|\|\s*/).map(function (range) {
917    return this.parseRange(range.trim())
918  }, this).filter(function (c) {
919    // throw out any that are not relevant for whatever reason
920    return c.length
921  })
922
923  if (!this.set.length) {
924    throw new TypeError('Invalid SemVer Range: ' + range)
925  }
926
927  this.format()
928}
929
930Range.prototype.format = function () {
931  this.range = this.set.map(function (comps) {
932    return comps.join(' ').trim()
933  }).join('||').trim()
934  return this.range
935}
936
937Range.prototype.toString = function () {
938  return this.range
939}
940
941Range.prototype.parseRange = function (range) {
942  var loose = this.options.loose
943  range = range.trim()
944  // `1.2.3 - 1.2.4` => `>=1.2.3 <=1.2.4`
945  var hr = loose ? re[t.HYPHENRANGELOOSE] : re[t.HYPHENRANGE]
946  range = range.replace(hr, hyphenReplace)
947  debug('hyphen replace', range)
948  // `> 1.2.3 < 1.2.5` => `>1.2.3 <1.2.5`
949  range = range.replace(re[t.COMPARATORTRIM], comparatorTrimReplace)
950  debug('comparator trim', range, re[t.COMPARATORTRIM])
951
952  // `~ 1.2.3` => `~1.2.3`
953  range = range.replace(re[t.TILDETRIM], tildeTrimReplace)
954
955  // `^ 1.2.3` => `^1.2.3`
956  range = range.replace(re[t.CARETTRIM], caretTrimReplace)
957
958  // normalize spaces
959  range = range.split(/\s+/).join(' ')
960
961  // At this point, the range is completely trimmed and
962  // ready to be split into comparators.
963
964  var compRe = loose ? re[t.COMPARATORLOOSE] : re[t.COMPARATOR]
965  var set = range.split(' ').map(function (comp) {
966    return parseComparator(comp, this.options)
967  }, this).join(' ').split(/\s+/)
968  if (this.options.loose) {
969    // in loose mode, throw out any that are not valid comparators
970    set = set.filter(function (comp) {
971      return !!comp.match(compRe)
972    })
973  }
974  set = set.map(function (comp) {
975    return new Comparator(comp, this.options)
976  }, this)
977
978  return set
979}
980
981Range.prototype.intersects = function (range, options) {
982  if (!(range instanceof Range)) {
983    throw new TypeError('a Range is required')
984  }
985
986  return this.set.some(function (thisComparators) {
987    return (
988      isSatisfiable(thisComparators, options) &&
989      range.set.some(function (rangeComparators) {
990        return (
991          isSatisfiable(rangeComparators, options) &&
992          thisComparators.every(function (thisComparator) {
993            return rangeComparators.every(function (rangeComparator) {
994              return thisComparator.intersects(rangeComparator, options)
995            })
996          })
997        )
998      })
999    )
1000  })
1001}
1002
1003// take a set of comparators and determine whether there
1004// exists a version which can satisfy it
1005function isSatisfiable (comparators, options) {
1006  var result = true
1007  var remainingComparators = comparators.slice()
1008  var testComparator = remainingComparators.pop()
1009
1010  while (result && remainingComparators.length) {
1011    result = remainingComparators.every(function (otherComparator) {
1012      return testComparator.intersects(otherComparator, options)
1013    })
1014
1015    testComparator = remainingComparators.pop()
1016  }
1017
1018  return result
1019}
1020
1021// Mostly just for testing and legacy API reasons
1022exports.toComparators = toComparators
1023function toComparators (range, options) {
1024  return new Range(range, options).set.map(function (comp) {
1025    return comp.map(function (c) {
1026      return c.value
1027    }).join(' ').trim().split(' ')
1028  })
1029}
1030
1031// comprised of xranges, tildes, stars, and gtlt's at this point.
1032// already replaced the hyphen ranges
1033// turn into a set of JUST comparators.
1034function parseComparator (comp, options) {
1035  debug('comp', comp, options)
1036  comp = replaceCarets(comp, options)
1037  debug('caret', comp)
1038  comp = replaceTildes(comp, options)
1039  debug('tildes', comp)
1040  comp = replaceXRanges(comp, options)
1041  debug('xrange', comp)
1042  comp = replaceStars(comp, options)
1043  debug('stars', comp)
1044  return comp
1045}
1046
1047function isX (id) {
1048  return !id || id.toLowerCase() === 'x' || id === '*'
1049}
1050
1051// ~, ~> --> * (any, kinda silly)
1052// ~2, ~2.x, ~2.x.x, ~>2, ~>2.x ~>2.x.x --> >=2.0.0 <3.0.0
1053// ~2.0, ~2.0.x, ~>2.0, ~>2.0.x --> >=2.0.0 <2.1.0
1054// ~1.2, ~1.2.x, ~>1.2, ~>1.2.x --> >=1.2.0 <1.3.0
1055// ~1.2.3, ~>1.2.3 --> >=1.2.3 <1.3.0
1056// ~1.2.0, ~>1.2.0 --> >=1.2.0 <1.3.0
1057function replaceTildes (comp, options) {
1058  return comp.trim().split(/\s+/).map(function (comp) {
1059    return replaceTilde(comp, options)
1060  }).join(' ')
1061}
1062
1063function replaceTilde (comp, options) {
1064  var r = options.loose ? re[t.TILDELOOSE] : re[t.TILDE]
1065  return comp.replace(r, function (_, M, m, p, pr) {
1066    debug('tilde', comp, _, M, m, p, pr)
1067    var ret
1068
1069    if (isX(M)) {
1070      ret = ''
1071    } else if (isX(m)) {
1072      ret = '>=' + M + '.0.0 <' + (+M + 1) + '.0.0'
1073    } else if (isX(p)) {
1074      // ~1.2 == >=1.2.0 <1.3.0
1075      ret = '>=' + M + '.' + m + '.0 <' + M + '.' + (+m + 1) + '.0'
1076    } else if (pr) {
1077      debug('replaceTilde pr', pr)
1078      ret = '>=' + M + '.' + m + '.' + p + '-' + pr +
1079            ' <' + M + '.' + (+m + 1) + '.0'
1080    } else {
1081      // ~1.2.3 == >=1.2.3 <1.3.0
1082      ret = '>=' + M + '.' + m + '.' + p +
1083            ' <' + M + '.' + (+m + 1) + '.0'
1084    }
1085
1086    debug('tilde return', ret)
1087    return ret
1088  })
1089}
1090
1091// ^ --> * (any, kinda silly)
1092// ^2, ^2.x, ^2.x.x --> >=2.0.0 <3.0.0
1093// ^2.0, ^2.0.x --> >=2.0.0 <3.0.0
1094// ^1.2, ^1.2.x --> >=1.2.0 <2.0.0
1095// ^1.2.3 --> >=1.2.3 <2.0.0
1096// ^1.2.0 --> >=1.2.0 <2.0.0
1097function replaceCarets (comp, options) {
1098  return comp.trim().split(/\s+/).map(function (comp) {
1099    return replaceCaret(comp, options)
1100  }).join(' ')
1101}
1102
1103function replaceCaret (comp, options) {
1104  debug('caret', comp, options)
1105  var r = options.loose ? re[t.CARETLOOSE] : re[t.CARET]
1106  return comp.replace(r, function (_, M, m, p, pr) {
1107    debug('caret', comp, _, M, m, p, pr)
1108    var ret
1109
1110    if (isX(M)) {
1111      ret = ''
1112    } else if (isX(m)) {
1113      ret = '>=' + M + '.0.0 <' + (+M + 1) + '.0.0'
1114    } else if (isX(p)) {
1115      if (M === '0') {
1116        ret = '>=' + M + '.' + m + '.0 <' + M + '.' + (+m + 1) + '.0'
1117      } else {
1118        ret = '>=' + M + '.' + m + '.0 <' + (+M + 1) + '.0.0'
1119      }
1120    } else if (pr) {
1121      debug('replaceCaret pr', pr)
1122      if (M === '0') {
1123        if (m === '0') {
1124          ret = '>=' + M + '.' + m + '.' + p + '-' + pr +
1125                ' <' + M + '.' + m + '.' + (+p + 1)
1126        } else {
1127          ret = '>=' + M + '.' + m + '.' + p + '-' + pr +
1128                ' <' + M + '.' + (+m + 1) + '.0'
1129        }
1130      } else {
1131        ret = '>=' + M + '.' + m + '.' + p + '-' + pr +
1132              ' <' + (+M + 1) + '.0.0'
1133      }
1134    } else {
1135      debug('no pr')
1136      if (M === '0') {
1137        if (m === '0') {
1138          ret = '>=' + M + '.' + m + '.' + p +
1139                ' <' + M + '.' + m + '.' + (+p + 1)
1140        } else {
1141          ret = '>=' + M + '.' + m + '.' + p +
1142                ' <' + M + '.' + (+m + 1) + '.0'
1143        }
1144      } else {
1145        ret = '>=' + M + '.' + m + '.' + p +
1146              ' <' + (+M + 1) + '.0.0'
1147      }
1148    }
1149
1150    debug('caret return', ret)
1151    return ret
1152  })
1153}
1154
1155function replaceXRanges (comp, options) {
1156  debug('replaceXRanges', comp, options)
1157  return comp.split(/\s+/).map(function (comp) {
1158    return replaceXRange(comp, options)
1159  }).join(' ')
1160}
1161
1162function replaceXRange (comp, options) {
1163  comp = comp.trim()
1164  var r = options.loose ? re[t.XRANGELOOSE] : re[t.XRANGE]
1165  return comp.replace(r, function (ret, gtlt, M, m, p, pr) {
1166    debug('xRange', comp, ret, gtlt, M, m, p, pr)
1167    var xM = isX(M)
1168    var xm = xM || isX(m)
1169    var xp = xm || isX(p)
1170    var anyX = xp
1171
1172    if (gtlt === '=' && anyX) {
1173      gtlt = ''
1174    }
1175
1176    // if we're including prereleases in the match, then we need
1177    // to fix this to -0, the lowest possible prerelease value
1178    pr = options.includePrerelease ? '-0' : ''
1179
1180    if (xM) {
1181      if (gtlt === '>' || gtlt === '<') {
1182        // nothing is allowed
1183        ret = '<0.0.0-0'
1184      } else {
1185        // nothing is forbidden
1186        ret = '*'
1187      }
1188    } else if (gtlt && anyX) {
1189      // we know patch is an x, because we have any x at all.
1190      // replace X with 0
1191      if (xm) {
1192        m = 0
1193      }
1194      p = 0
1195
1196      if (gtlt === '>') {
1197        // >1 => >=2.0.0
1198        // >1.2 => >=1.3.0
1199        // >1.2.3 => >= 1.2.4
1200        gtlt = '>='
1201        if (xm) {
1202          M = +M + 1
1203          m = 0
1204          p = 0
1205        } else {
1206          m = +m + 1
1207          p = 0
1208        }
1209      } else if (gtlt === '<=') {
1210        // <=0.7.x is actually <0.8.0, since any 0.7.x should
1211        // pass.  Similarly, <=7.x is actually <8.0.0, etc.
1212        gtlt = '<'
1213        if (xm) {
1214          M = +M + 1
1215        } else {
1216          m = +m + 1
1217        }
1218      }
1219
1220      ret = gtlt + M + '.' + m + '.' + p + pr
1221    } else if (xm) {
1222      ret = '>=' + M + '.0.0' + pr + ' <' + (+M + 1) + '.0.0' + pr
1223    } else if (xp) {
1224      ret = '>=' + M + '.' + m + '.0' + pr +
1225        ' <' + M + '.' + (+m + 1) + '.0' + pr
1226    }
1227
1228    debug('xRange return', ret)
1229
1230    return ret
1231  })
1232}
1233
1234// Because * is AND-ed with everything else in the comparator,
1235// and '' means "any version", just remove the *s entirely.
1236function replaceStars (comp, options) {
1237  debug('replaceStars', comp, options)
1238  // Looseness is ignored here.  star is always as loose as it gets!
1239  return comp.trim().replace(re[t.STAR], '')
1240}
1241
1242// This function is passed to string.replace(re[t.HYPHENRANGE])
1243// M, m, patch, prerelease, build
1244// 1.2 - 3.4.5 => >=1.2.0 <=3.4.5
1245// 1.2.3 - 3.4 => >=1.2.0 <3.5.0 Any 3.4.x will do
1246// 1.2 - 3.4 => >=1.2.0 <3.5.0
1247function hyphenReplace ($0,
1248  from, fM, fm, fp, fpr, fb,
1249  to, tM, tm, tp, tpr, tb) {
1250  if (isX(fM)) {
1251    from = ''
1252  } else if (isX(fm)) {
1253    from = '>=' + fM + '.0.0'
1254  } else if (isX(fp)) {
1255    from = '>=' + fM + '.' + fm + '.0'
1256  } else {
1257    from = '>=' + from
1258  }
1259
1260  if (isX(tM)) {
1261    to = ''
1262  } else if (isX(tm)) {
1263    to = '<' + (+tM + 1) + '.0.0'
1264  } else if (isX(tp)) {
1265    to = '<' + tM + '.' + (+tm + 1) + '.0'
1266  } else if (tpr) {
1267    to = '<=' + tM + '.' + tm + '.' + tp + '-' + tpr
1268  } else {
1269    to = '<=' + to
1270  }
1271
1272  return (from + ' ' + to).trim()
1273}
1274
1275// if ANY of the sets match ALL of its comparators, then pass
1276Range.prototype.test = function (version) {
1277  if (!version) {
1278    return false
1279  }
1280
1281  if (typeof version === 'string') {
1282    try {
1283      version = new SemVer(version, this.options)
1284    } catch (er) {
1285      return false
1286    }
1287  }
1288
1289  for (var i = 0; i < this.set.length; i++) {
1290    if (testSet(this.set[i], version, this.options)) {
1291      return true
1292    }
1293  }
1294  return false
1295}
1296
1297function testSet (set, version, options) {
1298  for (var i = 0; i < set.length; i++) {
1299    if (!set[i].test(version)) {
1300      return false
1301    }
1302  }
1303
1304  if (version.prerelease.length && !options.includePrerelease) {
1305    // Find the set of versions that are allowed to have prereleases
1306    // For example, ^1.2.3-pr.1 desugars to >=1.2.3-pr.1 <2.0.0
1307    // That should allow `1.2.3-pr.2` to pass.
1308    // However, `1.2.4-alpha.notready` should NOT be allowed,
1309    // even though it's within the range set by the comparators.
1310    for (i = 0; i < set.length; i++) {
1311      debug(set[i].semver)
1312      if (set[i].semver === ANY) {
1313        continue
1314      }
1315
1316      if (set[i].semver.prerelease.length > 0) {
1317        var allowed = set[i].semver
1318        if (allowed.major === version.major &&
1319            allowed.minor === version.minor &&
1320            allowed.patch === version.patch) {
1321          return true
1322        }
1323      }
1324    }
1325
1326    // Version has a -pre, but it's not one of the ones we like.
1327    return false
1328  }
1329
1330  return true
1331}
1332
1333exports.satisfies = satisfies
1334function satisfies (version, range, options) {
1335  try {
1336    range = new Range(range, options)
1337  } catch (er) {
1338    return false
1339  }
1340  return range.test(version)
1341}
1342
1343exports.maxSatisfying = maxSatisfying
1344function maxSatisfying (versions, range, options) {
1345  var max = null
1346  var maxSV = null
1347  try {
1348    var rangeObj = new Range(range, options)
1349  } catch (er) {
1350    return null
1351  }
1352  versions.forEach(function (v) {
1353    if (rangeObj.test(v)) {
1354      // satisfies(v, range, options)
1355      if (!max || maxSV.compare(v) === -1) {
1356        // compare(max, v, true)
1357        max = v
1358        maxSV = new SemVer(max, options)
1359      }
1360    }
1361  })
1362  return max
1363}
1364
1365exports.minSatisfying = minSatisfying
1366function minSatisfying (versions, range, options) {
1367  var min = null
1368  var minSV = null
1369  try {
1370    var rangeObj = new Range(range, options)
1371  } catch (er) {
1372    return null
1373  }
1374  versions.forEach(function (v) {
1375    if (rangeObj.test(v)) {
1376      // satisfies(v, range, options)
1377      if (!min || minSV.compare(v) === 1) {
1378        // compare(min, v, true)
1379        min = v
1380        minSV = new SemVer(min, options)
1381      }
1382    }
1383  })
1384  return min
1385}
1386
1387exports.minVersion = minVersion
1388function minVersion (range, loose) {
1389  range = new Range(range, loose)
1390
1391  var minver = new SemVer('0.0.0')
1392  if (range.test(minver)) {
1393    return minver
1394  }
1395
1396  minver = new SemVer('0.0.0-0')
1397  if (range.test(minver)) {
1398    return minver
1399  }
1400
1401  minver = null
1402  for (var i = 0; i < range.set.length; ++i) {
1403    var comparators = range.set[i]
1404
1405    comparators.forEach(function (comparator) {
1406      // Clone to avoid manipulating the comparator's semver object.
1407      var compver = new SemVer(comparator.semver.version)
1408      switch (comparator.operator) {
1409        case '>':
1410          if (compver.prerelease.length === 0) {
1411            compver.patch++
1412          } else {
1413            compver.prerelease.push(0)
1414          }
1415          compver.raw = compver.format()
1416          /* fallthrough */
1417        case '':
1418        case '>=':
1419          if (!minver || gt(minver, compver)) {
1420            minver = compver
1421          }
1422          break
1423        case '<':
1424        case '<=':
1425          /* Ignore maximum versions */
1426          break
1427        /* istanbul ignore next */
1428        default:
1429          throw new Error('Unexpected operation: ' + comparator.operator)
1430      }
1431    })
1432  }
1433
1434  if (minver && range.test(minver)) {
1435    return minver
1436  }
1437
1438  return null
1439}
1440
1441exports.validRange = validRange
1442function validRange (range, options) {
1443  try {
1444    // Return '*' instead of '' so that truthiness works.
1445    // This will throw if it's invalid anyway
1446    return new Range(range, options).range || '*'
1447  } catch (er) {
1448    return null
1449  }
1450}
1451
1452// Determine if version is less than all the versions possible in the range
1453exports.ltr = ltr
1454function ltr (version, range, options) {
1455  return outside(version, range, '<', options)
1456}
1457
1458// Determine if version is greater than all the versions possible in the range.
1459exports.gtr = gtr
1460function gtr (version, range, options) {
1461  return outside(version, range, '>', options)
1462}
1463
1464exports.outside = outside
1465function outside (version, range, hilo, options) {
1466  version = new SemVer(version, options)
1467  range = new Range(range, options)
1468
1469  var gtfn, ltefn, ltfn, comp, ecomp
1470  switch (hilo) {
1471    case '>':
1472      gtfn = gt
1473      ltefn = lte
1474      ltfn = lt
1475      comp = '>'
1476      ecomp = '>='
1477      break
1478    case '<':
1479      gtfn = lt
1480      ltefn = gte
1481      ltfn = gt
1482      comp = '<'
1483      ecomp = '<='
1484      break
1485    default:
1486      throw new TypeError('Must provide a hilo val of "<" or ">"')
1487  }
1488
1489  // If it satisifes the range it is not outside
1490  if (satisfies(version, range, options)) {
1491    return false
1492  }
1493
1494  // From now on, variable terms are as if we're in "gtr" mode.
1495  // but note that everything is flipped for the "ltr" function.
1496
1497  for (var i = 0; i < range.set.length; ++i) {
1498    var comparators = range.set[i]
1499
1500    var high = null
1501    var low = null
1502
1503    comparators.forEach(function (comparator) {
1504      if (comparator.semver === ANY) {
1505        comparator = new Comparator('>=0.0.0')
1506      }
1507      high = high || comparator
1508      low = low || comparator
1509      if (gtfn(comparator.semver, high.semver, options)) {
1510        high = comparator
1511      } else if (ltfn(comparator.semver, low.semver, options)) {
1512        low = comparator
1513      }
1514    })
1515
1516    // If the edge version comparator has a operator then our version
1517    // isn't outside it
1518    if (high.operator === comp || high.operator === ecomp) {
1519      return false
1520    }
1521
1522    // If the lowest version comparator has an operator and our version
1523    // is less than it then it isn't higher than the range
1524    if ((!low.operator || low.operator === comp) &&
1525        ltefn(version, low.semver)) {
1526      return false
1527    } else if (low.operator === ecomp && ltfn(version, low.semver)) {
1528      return false
1529    }
1530  }
1531  return true
1532}
1533
1534exports.prerelease = prerelease
1535function prerelease (version, options) {
1536  var parsed = parse(version, options)
1537  return (parsed && parsed.prerelease.length) ? parsed.prerelease : null
1538}
1539
1540exports.intersects = intersects
1541function intersects (r1, r2, options) {
1542  r1 = new Range(r1, options)
1543  r2 = new Range(r2, options)
1544  return r1.intersects(r2)
1545}
1546
1547exports.coerce = coerce
1548function coerce (version, options) {
1549  if (version instanceof SemVer) {
1550    return version
1551  }
1552
1553  if (typeof version === 'number') {
1554    version = String(version)
1555  }
1556
1557  if (typeof version !== 'string') {
1558    return null
1559  }
1560
1561  options = options || {}
1562
1563  var match = null
1564  if (!options.rtl) {
1565    match = version.match(re[t.COERCE])
1566  } else {
1567    // Find the right-most coercible string that does not share
1568    // a terminus with a more left-ward coercible string.
1569    // Eg, '1.2.3.4' wants to coerce '2.3.4', not '3.4' or '4'
1570    //
1571    // Walk through the string checking with a /g regexp
1572    // Manually set the index so as to pick up overlapping matches.
1573    // Stop when we get a match that ends at the string end, since no
1574    // coercible string can be more right-ward without the same terminus.
1575    var next
1576    while ((next = re[t.COERCERTL].exec(version)) &&
1577      (!match || match.index + match[0].length !== version.length)
1578    ) {
1579      if (!match ||
1580          next.index + next[0].length !== match.index + match[0].length) {
1581        match = next
1582      }
1583      re[t.COERCERTL].lastIndex = next.index + next[1].length + next[2].length
1584    }
1585    // leave it in a clean state
1586    re[t.COERCERTL].lastIndex = -1
1587  }
1588
1589  if (match === null) {
1590    return null
1591  }
1592
1593  return parse(match[2] +
1594    '.' + (match[3] || '0') +
1595    '.' + (match[4] || '0'), options)
1596}
1597

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