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Editing: class-wp-style-engine-css-declarations.php

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<?php
/**
 * Style Engine: WP_Style_Engine_CSS_Declarations class
 *
 * @package WordPress
 * @subpackage StyleEngine
 * @since 6.1.0
 */

/**
 * Core class used for style engine CSS declarations.
 *
 * Holds, sanitizes, processes, and prints CSS declarations for the style engine.
 *
 * @since 6.1.0
 */
#[AllowDynamicProperties]
class WP_Style_Engine_CSS_Declarations {

/**
	 * An array of CSS declarations (property => value pairs).
	 *
	 * @since 6.1.0
	 *
	 * @var string[]
	 */
	protected $declarations = array();

/**
	 * CSS declaration options keyed by property name.
	 *
	 * @since 7.1.0
	 *
	 * @var array
	 */
	protected $declaration_options = array();

/**
	 * Constructor for this object.
	 *
	 * If a `$declarations` array is passed, it will be used to populate
	 * the initial `$declarations` prop of the object by calling add_declarations().
	 *
	 * @since 6.1.0
	 *
	 * @param string[] $declarations Optional. An associative array of CSS definitions,
	 *                               e.g. `array( "$property" => "$value", "$property" => "$value" )`.
	 *                               Default empty array.
	 */
	public function __construct( $declarations = array() ) {
		$this->add_declarations( $declarations );
	}

/**
	 * Adds a single declaration.
	 *
	 * @since 6.1.0
	 * @since 7.1.0 Added the `$options` parameter.
	 *
	 * @param string $property The CSS property.
	 * @param string $value    The CSS value.
	 * @param array  $options  {
	 *     Optional. An array of options. Default empty array.
	 *
	 *     @type bool $important Whether to output the declaration with !important. Default false.
	 * }
	 * @return WP_Style_Engine_CSS_Declarations Returns the object to allow chaining methods.
	 */
	public function add_declaration( $property, $value, $options = array() ) {
		// Sanitizes the property.
		$property = $this->sanitize_property( $property );
		// Bails early if the property is empty.
		if ( empty( $property ) ) {
			return $this;
		}

// Bail early if value is not a string. Prevents fatal errors from malformed block markup.
		if ( ! is_string( $value ) ) {
			return $this;
		}

// Trims the value. If empty, bail early.
		$value = trim( $value );
		if ( '' === $value ) {
			return $this;
		}

$options = wp_parse_args(
			$options,
			array(
				'important' => false,
			)
		);
		$options = array_filter( $options );

// Adds the declaration property/value pair.
		$this->declarations[ $property ] = $value;
		if ( $options ) {
			$this->declaration_options[ $property ] = $options;
		} else {
			unset( $this->declaration_options[ $property ] );
		}

return $this;
	}

/**
	 * Removes a single declaration.
	 *
	 * @since 6.1.0
	 *
	 * @param string $property The CSS property.
	 * @return WP_Style_Engine_CSS_Declarations Returns the object to allow chaining methods.
	 */
	public function remove_declaration( $property ) {
		unset( $this->declarations[ $property ] );
		unset( $this->declaration_options[ $property ] );
		return $this;
	}

/**
	 * Adds multiple declarations.
	 *
	 * @since 6.1.0
	 *
	 * @param string[] $declarations An array of declarations.
	 * @return WP_Style_Engine_CSS_Declarations Returns the object to allow chaining methods.
	 */
	public function add_declarations( $declarations ) {
		foreach ( $declarations as $property => $value ) {
			$this->add_declaration( $property, $value );
		}
		return $this;
	}

/**
	 * Removes multiple declarations.
	 *
	 * @since 6.1.0
	 *
	 * @param string[] $properties Optional. An array of properties. Default empty array.
	 * @return WP_Style_Engine_CSS_Declarations Returns the object to allow chaining methods.
	 */
	public function remove_declarations( $properties = array() ) {
		foreach ( $properties as $property ) {
			$this->remove_declaration( $property );
		}
		return $this;
	}

/**
	 * Gets the declarations array.
	 *
	 * @since 6.1.0
	 *
	 * @return string[] The declarations array.
	 */
	public function get_declarations() {
		return $this->declarations;
	}

/**
	 * Gets declaration options keyed by property name.
	 *
	 * @since 7.1.0
	 *
	 * @return array Declaration options keyed by property name.
	 */
	public function get_declaration_options() {
		return $this->declaration_options;
	}

/**
	 * Filters a CSS property + value pair.
	 *
	 * @since 6.1.0
	 * @since 7.1.0 Added the `$options` parameter.
	 *
	 * @param string $property The CSS property.
	 * @param string $value    The value to be filtered.
	 * @param string $spacer   Optional. The spacer between the colon and the value.
	 *                         Default empty string.
	 * @param array  $options  {
	 *     Optional. An array of options. Default empty array.
	 *
	 *     @type bool $important Whether to output the declaration with !important. Default false.
	 * }
	 * @return string The filtered declaration or an empty string.
	 */
	protected static function filter_declaration( $property, $value, $spacer = '', $options = array() ) {
		$filtered_value = wp_strip_all_tags( $value, true );
		if ( '' !== $filtered_value ) {
			$options = wp_parse_args(
				$options,
				array(
					'important' => false,
				)
			);

$filtered_declaration = safecss_filter_attr( "{$property}:{$spacer}{$filtered_value}" );

// Only append !important in the presence of an option value and when sanitization returns a single declaration.
			if ( true === $options['important'] && '' !== $filtered_declaration && ! str_contains( $filtered_declaration, ';' ) ) {
				return "$filtered_declaration !important";
			}

return $filtered_declaration;
		}
		return '';
	}

/**
	 * Filters and compiles the CSS declarations.
	 *
	 * @since 6.1.0
	 *
	 * @param bool $should_prettify Optional. Whether to add spacing, new lines and indents.
	 *                              Default false.
	 * @param int  $indent_count    Optional. The number of tab indents to apply to the rule.
	 *                              Applies if `prettify` is `true`. Default 0.
	 * @return string The CSS declarations.
	 */
	public function get_declarations_string( $should_prettify = false, $indent_count = 0 ) {
		$declarations_array  = $this->get_declarations();
		$declarations_output = '';
		$indent              = $should_prettify ? str_repeat( "\t", $indent_count ) : '';
		$suffix              = $should_prettify ? ' ' : '';
		$suffix              = $should_prettify && $indent_count > 0 ? "\n" : $suffix;
		$spacer              = $should_prettify ? ' ' : '';

foreach ( $declarations_array as $property => $value ) {
			$filtered_declaration = static::filter_declaration( $property, $value, $spacer, $this->declaration_options[ $property ] ?? array() );
			if ( $filtered_declaration ) {
				$declarations_output .= "{$indent}{$filtered_declaration};$suffix";
			}
		}

return rtrim( $declarations_output );
	}

/**
	 * Sanitizes property names.
	 *
	 * @since 6.1.0
	 *
	 * @param string $property The CSS property.
	 * @return string The sanitized property name.
	 */
	protected function sanitize_property( $property ) {
		return sanitize_key( $property );
	}
}

Editing: class-wp-style-engine-css-declarations.php

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