Automattic\WooCommerce\Vendor\Pelago\Emogrifier\Utilities

DeclarationBlockParser::parse │ public │ WC 1.0

Parses a CSS declaration block into property name/value pairs.

Example:

The declaration block

"color: #000; font-weight: bold;"

will be parsed into the following array:

"color" => "#000" "font-weight" => "bold"

Method of the class: DeclarationBlockParser{}

No Hooks.

Returns

Array. string> the CSS declarations with the property names as array keys and the property values as array values

Usage

$DeclarationBlockParser = new DeclarationBlockParser();
$DeclarationBlockParser->parse( $declarationBlock ): array;
$declarationBlock(string) (required)
the CSS declarations block without the curly braces, may be empty.

DeclarationBlockParser::parse() code WC 10.9.4

woocommerce/lib/packages/Pelago/Emogrifier/Utilities/DeclarationBlockParser.php 
public function parse(string $declarationBlock): array
{
    if (isset(self::$cache[$declarationBlock])) {
        return self::$cache[$declarationBlock];
    }

    $preg = new Preg();

    $declarations = $preg->split('/;(?!base64|charset)/', $declarationBlock);

    $properties = [];
    foreach ($declarations as $declaration) {
        $matches = [];
        if (
            $preg->match(
                '/^([A-Za-z\\-]+)\\s*:\\s*(.+)$/s',
                \trim($declaration),
                $matches
            )
            === 0
        ) {
            continue;
        }

        $propertyName = $matches[1];
        if ($propertyName === '') {
            // This cannot happen since the regular epression matches one or more characters.
            throw new \UnexpectedValueException('An empty property name was encountered.', 1727046409);
        }
        $propertyValue = $matches[2];
        $properties[$this->normalizePropertyName($propertyName)] = $propertyValue;
    }
    self::$cache[$declarationBlock] = $properties;

    return $properties;
}