fix: enhance name parsing to support honorifics and various formats

Signed-off-by: Enjeck C. <patrathewhiz@gmail.com>

apps/dav/lib/CardDAV/Converter.php

@@ -21,6 +21,18 @@ use Sabre\VObject\Property\Text;
 use Sabre\VObject\Property\VCard\Date;
 
 class Converter {
+	private const NAME_SUFFIXES = [
+		'i', 'ii', 'iii', 'iv', 'v',
+		'senior', 'junior', 'jr', 'sr',
+		'phd', 'apr', 'rph', 'pe', 'md', 'ma', 'msc', 'bsc', 'ba', 'bs',
+		'dmd', 'cme', 'bsn', 'mba',
+		'ceo', 'cto', 'cfo', 'coo',
+	];
+	private const NAME_SALUTATIONS = [
+		'mr', 'mrs', 'ms', 'miss', 'master', 'mister', 'dr', 'rev', 'fr', 'prof',
+		'herr', 'frau', 'mme', 'mlle', 'me', 'pr',
+	];
+
 	public function __construct(
 		private IAccountManager $accountManager,
 		private IUserManager $userManager,
@@ -158,33 +170,87 @@ class Converter {
 	}
 
 	public function splitFullName(string $fullName): array {
-		// Very basic western style parsing. I'm not gonna implement
-		// https://github.com/android/platform_packages_providers_contactsprovider/blob/master/src/com/android/providers/contacts/NameSplitter.java ;)
-
-		// Handle "Lastname, Firstname" format
-		if (str_contains($fullName, ',')) {
-			[$family, $given] = array_map('trim', explode(',', $fullName, 2));
-			if ($family !== '' && $given !== '') {
-				return [$family, $given, '', '', ''];
+		// Based on https://github.com/joshfraser/PHP-Name-Parser
+
+		$prefix = [];
+		$suffix = [];
+		$cleanedName = preg_replace('/\([^()]*\)|\[[^[\]]*\]|\{[^{}]*\}/', ' ', $fullName) ?? $fullName;
+		$cleanedName = trim(preg_replace('/\s+/', ' ', $cleanedName) ?? $cleanedName);
+		if ($cleanedName === '') {
+			$cleanedName = trim($fullName);
+		}
+
+		$segments = array_values(array_filter(
+			array_map($this->splitNameWords(...), explode(',', $cleanedName)),
+			static fn (array $segment): bool => $segment !== [],
+		));
+
+		while (count($segments) > 1) {
+			$lastSegment = $segments[count($segments) - 1];
+			$knownSuffix = array_filter(
+				$lastSegment,
+				fn (string $word): bool => !$this->isNameSuffix($word),
+			) === [];
+			if (!$knownSuffix) {
+				break;
 			}
+			array_unshift($suffix, implode(' ', array_pop($segments)));
 		}
 
-		$elements = explode(' ', $fullName);
-		$result = ['', '', '', '', ''];
-		if (count($elements) > 2) {
-			$result[0] = implode(' ', array_slice($elements, count($elements) - 1));
-			$result[1] = $elements[0];
-			$result[2] = implode(' ', array_slice($elements, 1, count($elements) - 2));
-		} elseif (count($elements) === 2) {
-			$result[0] = $elements[1];
-			$result[1] = $elements[0];
+		if (count($segments) > 1 && count($segments[0]) === 1) {
+			$result = [$segments[0][0], '', '', '', ''];
+			$nameWords = array_merge(...array_slice($segments, 1));
 		} else {
-			$result[0] = $elements[0];
+			$result = ['', '', '', '', ''];
+			$nameWords = $segments[0] ?? $this->splitNameWords($cleanedName);
+			if (count($segments) > 1) {
+				$suffix[] = implode(', ', array_map(static fn (array $segment): string => implode(' ', $segment), array_slice($segments, 1)));
+			}
+		}
+
+		while (count($nameWords) > 1 && $this->isNameSalutation($nameWords[0])) {
+			$prefix[] = array_shift($nameWords);
+		}
+		while (count($nameWords) > 1 && $this->isNameSuffix($nameWords[count($nameWords) - 1])) {
+			array_unshift($suffix, array_pop($nameWords));
+		}
+
+		if ($result[0] !== '') {
+			$result[1] = $nameWords[0] ?? '';
+			$result[2] = implode(' ', array_slice($nameWords, 1));
+		} elseif (count($nameWords) > 2) {
+			$result[0] = implode(' ', array_slice($nameWords, count($nameWords) - 1));
+			$result[1] = $nameWords[0];
+			$result[2] = implode(' ', array_slice($nameWords, 1, count($nameWords) - 2));
+		} elseif (count($nameWords) === 2) {
+			$result[0] = $nameWords[1];
+			$result[1] = $nameWords[0];
+		} elseif (count($nameWords) === 1) {
+			$result[0] = $nameWords[0];
 		}
 
+		$result[3] = implode(' ', $prefix);
+		$result[4] = implode(', ', array_filter($suffix));
+
 		return $result;
 	}
 
+	private function splitNameWords(string $name): array {
+		return preg_split('/\s+/', trim($name), -1, PREG_SPLIT_NO_EMPTY) ?: [];
+	}
+
+	private function isNameSuffix(string $word): bool {
+		return in_array($this->normalizeNameWord($word), self::NAME_SUFFIXES, true);
+	}
+
+	private function isNameSalutation(string $word): bool {
+		return in_array($this->normalizeNameWord($word), self::NAME_SALUTATIONS, true);
+	}
+
+	private function normalizeNameWord(string $word): string {
+		return strtolower(preg_replace('/[.,]/', '', trim($word)) ?? $word);
+	}
+
 	private function getAvatarImage(IUser $user): ?IImage {
 		try {
 			return $user->getAvatarImage(512);

apps/dav/tests/unit/CardDAV/ConverterTest.php

@@ -201,6 +201,19 @@ class ConverterTest extends TestCase {
 			['Sauron;;;;', 'Sauron'],
 			['Baggins;Bilbo;;;', 'Bilbo Baggins'],
 			['Tolkien;John;Ronald Reuel;;', 'John Ronald Reuel Tolkien'],
+			['Doe;Jane;;;MD', 'Jane Doe, MD'],
+			['Williams;Mary;;;MD, PhD', 'Mary Williams, MD, PhD'],
+			['King;Martin;Luther;;Jr.', 'Martin Luther King, Jr.'],
+			['King;Martin;Luther;;Jr.', 'King, Martin Luther, Jr.'],
+			['Doe;Jane;;Dr.;', 'Dr. Jane Doe'],
+			['Doe;Jane;;Prof. Dr.;', 'Prof. Dr. Jane Doe'],
+			['Lastname;Firstname;;;', 'Lastname, Firstname'],
+			['Lastname;Firstname;Middlename;;', 'Lastname, Firstname Middlename'],
+			['b;a;;;c', 'a b, c'],
+			['a;b;c;;', 'a, b c'],
+			['Doe;Jane;;;', 'Jane Doe (Contracting)'],
+			['Smith;Jane;;;Ph.D.', 'Jane Smith Ph.D.'],
+			['Smith;R.;Jason;;', 'R. Jason Smith'],
 		];
 	}