codekingpro/portable-devtools

1'use strict'
2
3const SemVer = require('../classes/semver')
4const parse = require('./parse')
5const { safeRe: re, t } = require('../internal/re')
6
7const coerce = (version, options) => {
8  if (version instanceof SemVer) {
9    return version
10  }
11
12  if (typeof version === 'number') {
13    version = String(version)
14  }
15
16  if (typeof version !== 'string') {
17    return null
18  }
19
20  options = options || {}
21
22  let match = null
23  if (!options.rtl) {
24    match = version.match(options.includePrerelease ? re[t.COERCEFULL] : re[t.COERCE])
25  } else {
26    // Find the right-most coercible string that does not share
27    // a terminus with a more left-ward coercible string.
28    // Eg, '1.2.3.4' wants to coerce '2.3.4', not '3.4' or '4'
29    // With includePrerelease option set, '1.2.3.4-rc' wants to coerce '2.3.4-rc', not '2.3.4'
30    //
31    // Walk through the string checking with a /g regexp
32    // Manually set the index so as to pick up overlapping matches.
33    // Stop when we get a match that ends at the string end, since no
34    // coercible string can be more right-ward without the same terminus.
35    const coerceRtlRegex = options.includePrerelease ? re[t.COERCERTLFULL] : re[t.COERCERTL]
36    let next
37    while ((next = coerceRtlRegex.exec(version)) &&
38        (!match || match.index + match[0].length !== version.length)
39    ) {
40      if (!match ||
41            next.index + next[0].length !== match.index + match[0].length) {
42        match = next
43      }
44      coerceRtlRegex.lastIndex = next.index + next[1].length + next[2].length
45    }
46    // leave it in a clean state
47    coerceRtlRegex.lastIndex = -1
48  }
49
50  if (match === null) {
51    return null
52  }
53
54  const major = match[2]
55  const minor = match[3] || '0'
56  const patch = match[4] || '0'
57  const prerelease = options.includePrerelease && match[5] ? `-${match[5]}` : ''
58  const build = options.includePrerelease && match[6] ? `+${match[6]}` : ''
59
60  return parse(`${major}.${minor}.${patch}${prerelease}${build}`, options)
61}
62module.exports = coerce
63