import Metadata from '../metadata.js'
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/**
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* Pattern that makes it easy to distinguish whether a region has a single
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* international dialing prefix or not. If a region has a single international
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* prefix (e.g. 011 in USA), it will be represented as a string that contains
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* a sequence of ASCII digits, and possibly a tilde, which signals waiting for
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* the tone. If there are multiple available international prefixes in a
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* region, they will be represented as a regex string that always contains one
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* or more characters that are not ASCII digits or a tilde.
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*/
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const SINGLE_IDD_PREFIX_REG_EXP = /^[\d]+(?:[~\u2053\u223C\uFF5E][\d]+)?$/
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// For regions that have multiple IDD prefixes
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// a preferred IDD prefix is returned.
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export default function getIddPrefix(country, callingCode, metadata) {
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const countryMetadata = new Metadata(metadata)
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countryMetadata.selectNumberingPlan(country, callingCode)
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if (countryMetadata.defaultIDDPrefix()) {
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return countryMetadata.defaultIDDPrefix()
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}
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if (SINGLE_IDD_PREFIX_REG_EXP.test(countryMetadata.IDDPrefix())) {
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return countryMetadata.IDDPrefix()
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}
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}
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