Differential D8261 Diff 19659 src/infrastructure/customfield/parser/PhabricatorCustomFieldMonogramParser.php

Changeset View

Standalone View

				<?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;
				}

				}