\\w+)$#'; /** * @var string[] * @see https://www.php.net/manual/en/reference.pcre.pattern.modifiers.php */ private const ALL_MODIFIERS_VALUES = ['i', 'm', 's', 'x', 'e', 'A', 'D', 'S', 'U', 'X', 'J', 'u']; public function __construct(ValueResolver $valueResolver) { $this->valueResolver = $valueResolver; } /** * @return \PhpParser\Node\Expr\BinaryOp\Concat|\PhpParser\Node\Scalar\String_|null */ public function resolvePatternExpressionWithoutEIfFound(Expr $expr) { if ($expr instanceof String_) { $pattern = $this->valueResolver->getValue($expr); if (!\is_string($pattern)) { return null; } $delimiter = $pattern[0]; switch ($delimiter) { case '(': $delimiter = ')'; break; case '{': $delimiter = '}'; break; case '[': $delimiter = ']'; break; case '<': $delimiter = '>'; break; default: $delimiter = $delimiter; break; } /** @var string $modifiers */ $modifiers = $this->resolveModifiers((string) Strings::after($pattern, $delimiter, -1)); if (\strpos($modifiers, 'e') === \false) { return null; } $patternWithoutE = $this->createPatternWithoutE($pattern, $delimiter, $modifiers); return new String_($patternWithoutE); } if ($expr instanceof Concat) { return $this->matchConcat($expr); } return null; } private function resolveModifiers(string $modifiersCandidate) : string { $modifiers = ''; for ($modifierIndex = 0; $modifierIndex < \strlen($modifiersCandidate); ++$modifierIndex) { if (!\in_array($modifiersCandidate[$modifierIndex], self::ALL_MODIFIERS_VALUES, \true)) { $modifiers = ''; continue; } $modifiers .= $modifiersCandidate[$modifierIndex]; } return $modifiers; } private function createPatternWithoutE(string $pattern, string $delimiter, string $modifiers) : string { $modifiersWithoutE = \str_replace('e', '', $modifiers); return Strings::before($pattern, $delimiter, -1) . $delimiter . $modifiersWithoutE; } private function matchConcat(Concat $concat) : ?Concat { $lastItem = $concat->right; if (!$lastItem instanceof String_) { return null; } $matches = Strings::match($lastItem->value, self::LETTER_SUFFIX_REGEX); if (!isset($matches['modifiers'])) { return null; } if (\strpos((string) $matches['modifiers'], 'e') === \false) { return null; } // replace last "e" in the code $lastItem->value = Strings::replace($lastItem->value, self::LAST_E_REGEX, '$1$2'); return $concat; } }