Current File : //lib/node_modules/npm/node_modules/semver/functions/coerce.js
const SemVer = require('../classes/semver')
const parse = require('./parse')
const { re, t } = require('../internal/re')
const coerce = (version, options) => {
if (version instanceof SemVer) {
return version
}
if (typeof version === 'number') {
version = String(version)
}
if (typeof version !== 'string') {
return null
}
options = options || {}
let match = null
if (!options.rtl) {
match = version.match(re[t.COERCE])
} else {
// Find the right-most coercible string that does not share
// a terminus with a more left-ward coercible string.
// Eg, '1.2.3.4' wants to coerce '2.3.4', not '3.4' or '4'
//
// Walk through the string checking with a /g regexp
// Manually set the index so as to pick up overlapping matches.
// Stop when we get a match that ends at the string end, since no
// coercible string can be more right-ward without the same terminus.
let next
while ((next = re[t.COERCERTL].exec(version)) &&
(!match || match.index + match[0].length !== version.length)
) {
if (!match ||
next.index + next[0].length !== match.index + match[0].length) {
match = next
}
re[t.COERCERTL].lastIndex = next.index + next[1].length + next[2].length
}
// leave it in a clean state
re[t.COERCERTL].lastIndex = -1
}
if (match === null) {
return null
}
return parse(`${match[2]}.${match[3] || '0'}.${match[4] || '0'}`, options)
}
module.exports = coerce
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