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Viewing file:     isValidCandidate.js (2.98 KB)      -rw-r--r--

// Copy-pasted from `PhoneNumberMatcher.js`.
import { PLUS_CHARS } from '../constants';
import { limit } from './util';
import { isLatinLetter, isInvalidPunctuationSymbol } from './utf-8';
var OPENING_PARENS = "(\\[\uFF08\uFF3B";
var CLOSING_PARENS = ")\\]\uFF09\uFF3D";
var NON_PARENS = "[^".concat(OPENING_PARENS).concat(CLOSING_PARENS, "]");
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.

var LEAD_CLASS_LEADING = new RegExp('^' + LEAD_CLASS); // Limit on the number of pairs of brackets in a phone number.

var BRACKET_PAIR_LIMIT = limit(0, 3);
/**
 * Pattern to check that brackets match. Opening brackets should be closed within a phone number.
 * This also checks that there is something inside the brackets. Having no brackets at all is also
 * fine.
 *
 * An opening bracket at the beginning may not be closed, but subsequent ones should be.  It's
 * also possible that the leading bracket was dropped, so we shouldn't be surprised if we see a
 * closing bracket first. We limit the sets of brackets in a phone number to four.
 */

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 + "*" + '$');
/**
 * Matches strings that look like publication pages. Example:
 * <pre>Computing Complete Answers to Queries in the Presence of Limited Access Patterns.
 * Chen Li. VLDB J. 12(3): 211-227 (2003).</pre>
 *
 * The string "211-227 (2003)" is not a telephone number.
 */

var PUB_PAGES = /\d{1,5}-+\d{1,5}\s{0,4}\(\d{1,4}/;
export default function isValidCandidate(candidate, offset, text, leniency) {
  // Check the candidate doesn't contain any formatting
  // which would indicate that it really isn't a phone number.
  if (!MATCHING_BRACKETS_ENTIRE.test(candidate) || PUB_PAGES.test(candidate)) {
    return;
  } // If leniency is set to VALID or stricter, we also want to skip numbers that are surrounded
  // by Latin alphabetic characters, to skip cases like abc8005001234 or 8005001234def.


  if (leniency !== 'POSSIBLE') {
    // If the candidate is not at the start of the text,
    // and does not start with phone-number punctuation,
    // check the previous character.
    if (offset > 0 && !LEAD_CLASS_LEADING.test(candidate)) {
      var previousChar = text[offset - 1]; // We return null if it is a latin letter or an invalid punctuation symbol.

      if (isInvalidPunctuationSymbol(previousChar) || isLatinLetter(previousChar)) {
        return false;
      }
    }

    var lastCharIndex = offset + candidate.length;

    if (lastCharIndex < text.length) {
      var nextChar = text[lastCharIndex];

      if (isInvalidPunctuationSymbol(nextChar) || isLatinLetter(nextChar)) {
        return false;
      }
    }
  }

  return true;
}
//# sourceMappingURL=isValidCandidate.js.map