import createExtensionPattern from './createExtensionPattern.js'
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// Regexp of all known extension prefixes used by different regions followed by
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// 1 or more valid digits, for use when parsing.
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const EXTN_PATTERN = new RegExp('(?:' + createExtensionPattern() + ')$', 'i')
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// Strips any extension (as in, the part of the number dialled after the call is
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// connected, usually indicated with extn, ext, x or similar) from the end of
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// the number, and returns it.
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export default function extractExtension(number) {
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const start = number.search(EXTN_PATTERN)
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if (start < 0) {
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return {}
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}
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// If we find a potential extension, and the number preceding this is a viable
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// number, we assume it is an extension.
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const numberWithoutExtension = number.slice(0, start)
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const matches = number.match(EXTN_PATTERN)
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let i = 1
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while (i < matches.length) {
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if (matches[i]) {
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return {
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number: numberWithoutExtension,
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ext: matches[i]
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}
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}
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i++
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}
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}
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