wp-user-avatar
/
third-party
/
vendor
/
pelago
/
emogrifier
/
src
/
Utilities
/
DeclarationBlockParser.php
DeclarationBlockParser.php
89 lines
| 1 | <?php |
| 2 | |
| 3 | declare (strict_types=1); |
| 4 | namespace ProfilePressVendor\Pelago\Emogrifier\Utilities; |
| 5 | |
| 6 | use function ProfilePressVendor\Safe\preg_match; |
| 7 | use function ProfilePressVendor\Safe\preg_split; |
| 8 | /** |
| 9 | * Provides a common method for parsing CSS declaration blocks. |
| 10 | * These might be from actual CSS, or from the `style` attribute of an HTML DOM element. |
| 11 | * |
| 12 | * Caches results globally. |
| 13 | * |
| 14 | * @internal |
| 15 | */ |
| 16 | final class DeclarationBlockParser |
| 17 | { |
| 18 | /** |
| 19 | * @var array<non-empty-string, array<non-empty-string, string>> |
| 20 | */ |
| 21 | private static $cache = []; |
| 22 | /** |
| 23 | * CSS custom properties (variables) have case-sensitive names, so their case must be preserved. |
| 24 | * Standard CSS properties have case-insensitive names, which are converted to lowercase. |
| 25 | * |
| 26 | * @param non-empty-string $name |
| 27 | * |
| 28 | * @return non-empty-string |
| 29 | */ |
| 30 | public function normalizePropertyName(string $name): string |
| 31 | { |
| 32 | if (\substr($name, 0, 2) === '--') { |
| 33 | return $name; |
| 34 | } |
| 35 | return \strtolower($name); |
| 36 | } |
| 37 | /** |
| 38 | * Parses a CSS declaration block into property name/value pairs. |
| 39 | * |
| 40 | * Example: |
| 41 | * |
| 42 | * The declaration block |
| 43 | * |
| 44 | * ```css |
| 45 | * color: #000; font-weight: bold; |
| 46 | * ``` |
| 47 | * |
| 48 | * will be parsed into the following array: |
| 49 | * |
| 50 | * ```php |
| 51 | * [ |
| 52 | * 'color' => '#000', |
| 53 | * 'font-weight' => 'bold', |
| 54 | * ] |
| 55 | * ``` |
| 56 | * |
| 57 | * @param string $declarationBlock the CSS declarations block (without the curly braces) |
| 58 | * |
| 59 | * @return array<non-empty-string, string> |
| 60 | * the CSS declarations with the property names as array keys and the property values as array values |
| 61 | * |
| 62 | * @throws \UnexpectedValueException if an empty property name is encountered (which cannot happen) |
| 63 | */ |
| 64 | public function parse(string $declarationBlock): array |
| 65 | { |
| 66 | $trimmedDeclarationBlock = \trim($declarationBlock, "; \n\r\t\v\x00"); |
| 67 | if ($trimmedDeclarationBlock === '') { |
| 68 | return []; |
| 69 | } |
| 70 | if (isset(self::$cache[$trimmedDeclarationBlock])) { |
| 71 | return self::$cache[$trimmedDeclarationBlock]; |
| 72 | } |
| 73 | $declarations = preg_split('/;(?!base64|charset)/', $trimmedDeclarationBlock); |
| 74 | /** @var list<string> $declarations */ |
| 75 | $properties = []; |
| 76 | foreach ($declarations as $declaration) { |
| 77 | $matches = []; |
| 78 | if (preg_match('/^(-?+[a-zA-Z_][a-zA-Z_0-9\-]*+|--[a-zA-Z_0-9\-]++)\s*+:\s*+(.++)$/s', \trim($declaration), $matches) === 0) { |
| 79 | continue; |
| 80 | } |
| 81 | $propertyName = $matches[1]; |
| 82 | $propertyValue = $matches[2]; |
| 83 | $properties[$this->normalizePropertyName($propertyName)] = $propertyValue; |
| 84 | } |
| 85 | self::$cache[$trimmedDeclarationBlock] = $properties; |
| 86 | return $properties; |
| 87 | } |
| 88 | } |
| 89 |