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PhabricatorCustomFieldMonogramParser.php
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Sun, Apr 6, 23:52

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]*)+)'.
'(?:\band\s+('.$monogram_pattern.'))?'.
$suffix_regex.
'(?:$|\b)'.
'/';
$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) {
$monograms = array_filter(preg_split('/[,\s]+/', $set[3][0]));
if (isset($set[4]) && $set[4][0]) {
$monograms[] = $set[4][0];
}
$results[] = array(
'match' => $set[0][0],
'prefix' => $set[1][0],
'infix' => $set[2][0],
'monograms' => $monograms,
'suffix' => idx(idx($set, 5, array()), 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 = $optional ? '?' : '';
return '(?i:('.$parts.')'.$maybe_tail.')'.$maybe_optional;
}
}

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