WP_Theme_JSON::compute_style_properties( array $styles )

Source

File: wp-includes/class-wp-theme-json.php

private static function compute_style_properties( $styles ) {
		$declarations = array();
		if ( empty( $styles ) ) {
			return $declarations;
		}

		$properties = array();
		foreach ( self::PROPERTIES_METADATA as $name => $metadata ) {
			/*
			 * Some properties can be shorthand properties, meaning that
			 * they contain multiple values instead of a single one.
			 * An example of this is the padding property.
			 */
			if ( self::has_properties( $metadata ) ) {
				foreach ( $metadata['properties'] as $property ) {
					$properties[] = array(
						'name'  => $name . '-' . $property,
						'value' => array_merge( $metadata['value'], array( $property ) ),
					);
				}
			} else {
				$properties[] = array(
					'name'  => $name,
					'value' => $metadata['value'],
				);
			}
		}

		foreach ( $properties as $prop ) {
			$value = self::get_property_value( $styles, $prop['value'] );
			if ( empty( $value ) ) {
				continue;
			}

			$declarations[] = array(
				'name'  => $prop['name'],
				'value' => $value,
			);
		}

		return $declarations;
	}