PhabricatorCustomFieldMonogramParser.php
d016cac91513stable

PhabricatorCustomFieldMonogramParser.php
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			<?php

			abstract class PhabricatorCustomFieldMonogramParser
			extends Phobject {

			abstract protected function getPrefixes();
			abstract protected function getSuffixes();
			abstract protected function getInfixes();
			abstract protected function getMonogramPattern();

			public function parseCorpus($corpus) {
			$prefixes = $this->getPrefixes();
			$suffixes = $this->getSuffixes();
			$infixes = $this->getInfixes();

			$prefix_regex = $this->buildRegex($prefixes);
			$infix_regex = $this->buildRegex($infixes, true);
			$suffix_regex = $this->buildRegex($suffixes, true, true);

			$monogram_pattern = $this->getMonogramPattern();

			$pattern =
			'/'.
			'(?:^\|\b)'.
			$prefix_regex.
			$infix_regex.
			'((?:'.$monogram_pattern.'[,\s]*)+)'.
			$suffix_regex.
			'(?:$\|\b)'.
			'/i';

			$matches = null;
			$ok = preg_match_all(
			$pattern,
			$corpus,
			$matches,
			PREG_SET_ORDER \| PREG_OFFSET_CAPTURE);

			if ($ok === false) {
			throw new Exception(pht('Regular expression "%s" is invalid!', $pattern));
			}

			$results = array();
			foreach ($matches as $set) {
			$results[] = array(
			'match' => $set[0][0],
			'prefix' => $set[1][0],
			'infix' => $set[2][0],
			'monograms' => array_filter(preg_split('/[,\s]+/', $set[3][0])),
			'suffix' => $set[4][0],
			'offset' => $set[0][1],
			);
			}

			return $results;
			}

			private function buildRegex(array $list, $optional = false, $final = false) {
			$parts = array();
			foreach ($list as $string) {
			$parts[] = preg_quote($string, '/');
			}
			$parts = implode('\|', $parts);

			$maybe_tail = $final ? '' : '\s+';
			$maybe_optional = $optional ? '?' : '';

			return '(?:('.$parts.')'.$maybe_tail.')'.$maybe_optional;
			}

			}