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