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67 lines
3.0 KiB
67 lines
3.0 KiB
3 years ago
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// Copy-pasted from `PhoneNumberMatcher.js`.
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import { PLUS_CHARS } from '../constants.js';
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import { limit } from './util.js';
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import { isLatinLetter, isInvalidPunctuationSymbol } from './utf-8.js';
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var OPENING_PARENS = "(\\[\uFF08\uFF3B";
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var CLOSING_PARENS = ")\\]\uFF09\uFF3D";
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var NON_PARENS = "[^".concat(OPENING_PARENS).concat(CLOSING_PARENS, "]");
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export var LEAD_CLASS = "[".concat(OPENING_PARENS).concat(PLUS_CHARS, "]"); // Punctuation that may be at the start of a phone number - brackets and plus signs.
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var LEAD_CLASS_LEADING = new RegExp('^' + LEAD_CLASS); // Limit on the number of pairs of brackets in a phone number.
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var BRACKET_PAIR_LIMIT = limit(0, 3);
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/**
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* Pattern to check that brackets match. Opening brackets should be closed within a phone number.
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* This also checks that there is something inside the brackets. Having no brackets at all is also
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* fine.
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*
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* An opening bracket at the beginning may not be closed, but subsequent ones should be. It's
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* also possible that the leading bracket was dropped, so we shouldn't be surprised if we see a
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* closing bracket first. We limit the sets of brackets in a phone number to four.
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*/
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var MATCHING_BRACKETS_ENTIRE = new RegExp('^' + "(?:[" + OPENING_PARENS + "])?" + "(?:" + NON_PARENS + "+" + "[" + CLOSING_PARENS + "])?" + NON_PARENS + "+" + "(?:[" + OPENING_PARENS + "]" + NON_PARENS + "+[" + CLOSING_PARENS + "])" + BRACKET_PAIR_LIMIT + NON_PARENS + "*" + '$');
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/**
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* Matches strings that look like publication pages. Example:
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* <pre>Computing Complete Answers to Queries in the Presence of Limited Access Patterns.
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* Chen Li. VLDB J. 12(3): 211-227 (2003).</pre>
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*
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* The string "211-227 (2003)" is not a telephone number.
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*/
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var PUB_PAGES = /\d{1,5}-+\d{1,5}\s{0,4}\(\d{1,4}/;
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export default function isValidCandidate(candidate, offset, text, leniency) {
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// Check the candidate doesn't contain any formatting
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// which would indicate that it really isn't a phone number.
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if (!MATCHING_BRACKETS_ENTIRE.test(candidate) || PUB_PAGES.test(candidate)) {
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return;
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} // If leniency is set to VALID or stricter, we also want to skip numbers that are surrounded
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// by Latin alphabetic characters, to skip cases like abc8005001234 or 8005001234def.
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if (leniency !== 'POSSIBLE') {
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// If the candidate is not at the start of the text,
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// and does not start with phone-number punctuation,
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// check the previous character.
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if (offset > 0 && !LEAD_CLASS_LEADING.test(candidate)) {
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var previousChar = text[offset - 1]; // We return null if it is a latin letter or an invalid punctuation symbol.
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if (isInvalidPunctuationSymbol(previousChar) || isLatinLetter(previousChar)) {
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return false;
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}
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}
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var lastCharIndex = offset + candidate.length;
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if (lastCharIndex < text.length) {
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var nextChar = text[lastCharIndex];
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if (isInvalidPunctuationSymbol(nextChar) || isLatinLetter(nextChar)) {
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return false;
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}
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}
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}
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return true;
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}
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//# sourceMappingURL=isValidCandidate.js.map
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