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import { VALID_DIGITS } from '../../constants.js'
// The RFC 3966 format for extensions.
const RFC3966_EXTN_PREFIX = ';ext='
/**
* Helper method for constructing regular expressions for parsing. Creates
* an expression that captures up to max_length digits.
* @return {string} RegEx pattern to capture extension digits.
*/
const getExtensionDigitsPattern = (maxLength) => `([${VALID_DIGITS}]{1,${maxLength}})`
/**
* Helper initialiser method to create the regular-expression pattern to match
* extensions.
* Copy-pasted from Google's `libphonenumber`:
* https://github.com/google/libphonenumber/blob/55b2646ec9393f4d3d6661b9c82ef9e258e8b829/javascript/i18n/phonenumbers/phonenumberutil.js#L759-L766
* @return {string} RegEx pattern to capture extensions.
*/
export default function createExtensionPattern(purpose) {
// We cap the maximum length of an extension based on the ambiguity of the way
// the extension is prefixed. As per ITU, the officially allowed length for
// extensions is actually 40, but we don't support this since we haven't seen real
// examples and this introduces many false interpretations as the extension labels
// are not standardized.
/** @type {string} */
var extLimitAfterExplicitLabel = '20';
/** @type {string} */
var extLimitAfterLikelyLabel = '15';
/** @type {string} */
var extLimitAfterAmbiguousChar = '9';
/** @type {string} */
var extLimitWhenNotSure = '6';
/** @type {string} */
var possibleSeparatorsBetweenNumberAndExtLabel = "[ \u00A0\\t,]*";
// Optional full stop (.) or colon, followed by zero or more spaces/tabs/commas.
/** @type {string} */
var possibleCharsAfterExtLabel = "[:\\.\uFF0E]?[ \u00A0\\t,-]*";
/** @type {string} */
var optionalExtnSuffix = "#?";
// Here the extension is called out in more explicit way, i.e mentioning it obvious
// patterns like "ext.".
/** @type {string} */
var explicitExtLabels =
"(?:e?xt(?:ensi(?:o\u0301?|\u00F3))?n?|\uFF45?\uFF58\uFF54\uFF4E?|\u0434\u043E\u0431|anexo)";
// One-character symbols that can be used to indicate an extension, and less
// commonly used or more ambiguous extension labels.
/** @type {string} */
var ambiguousExtLabels = "(?:[x\uFF58#\uFF03~\uFF5E]|int|\uFF49\uFF4E\uFF54)";
// When extension is not separated clearly.
/** @type {string} */
var ambiguousSeparator = "[- ]+";
// This is the same as possibleSeparatorsBetweenNumberAndExtLabel, but not matching
// comma as extension label may have it.
/** @type {string} */
var possibleSeparatorsNumberExtLabelNoComma = "[ \u00A0\\t]*";
// ",," is commonly used for auto dialling the extension when connected. First
// comma is matched through possibleSeparatorsBetweenNumberAndExtLabel, so we do
// not repeat it here. Semi-colon works in Iphone and Android also to pop up a
// button with the extension number following.
/** @type {string} */
var autoDiallingAndExtLabelsFound = "(?:,{2}|;)";
/** @type {string} */
var rfcExtn = RFC3966_EXTN_PREFIX
+ getExtensionDigitsPattern(extLimitAfterExplicitLabel);
/** @type {string} */
var explicitExtn = possibleSeparatorsBetweenNumberAndExtLabel + explicitExtLabels
+ possibleCharsAfterExtLabel
+ getExtensionDigitsPattern(extLimitAfterExplicitLabel)
+ optionalExtnSuffix;
/** @type {string} */
var ambiguousExtn = possibleSeparatorsBetweenNumberAndExtLabel + ambiguousExtLabels
+ possibleCharsAfterExtLabel
+ getExtensionDigitsPattern(extLimitAfterAmbiguousChar)
+ optionalExtnSuffix;
/** @type {string} */
var americanStyleExtnWithSuffix = ambiguousSeparator
+ getExtensionDigitsPattern(extLimitWhenNotSure) + "#";
/** @type {string} */
var autoDiallingExtn = possibleSeparatorsNumberExtLabelNoComma
+ autoDiallingAndExtLabelsFound + possibleCharsAfterExtLabel
+ getExtensionDigitsPattern(extLimitAfterLikelyLabel)
+ optionalExtnSuffix;
/** @type {string} */
var onlyCommasExtn = possibleSeparatorsNumberExtLabelNoComma
+ "(?:,)+" + possibleCharsAfterExtLabel
+ getExtensionDigitsPattern(extLimitAfterAmbiguousChar)
+ optionalExtnSuffix;
// The first regular expression covers RFC 3966 format, where the extension is added
// using ";ext=". The second more generic where extension is mentioned with explicit
// labels like "ext:". In both the above cases we allow more numbers in extension than
// any other extension labels. The third one captures when single character extension
// labels or less commonly used labels are used. In such cases we capture fewer
// extension digits in order to reduce the chance of falsely interpreting two
// numbers beside each other as a number + extension. The fourth one covers the
// special case of American numbers where the extension is written with a hash
// at the end, such as "- 503#". The fifth one is exclusively for extension
// autodialling formats which are used when dialling and in this case we accept longer
// extensions. The last one is more liberal on the number of commas that acts as
// extension labels, so we have a strict cap on the number of digits in such extensions.
return rfcExtn + "|"
+ explicitExtn + "|"
+ ambiguousExtn + "|"
+ americanStyleExtnWithSuffix + "|"
+ autoDiallingExtn + "|"
+ onlyCommasExtn;
}
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