Gets a WP_Style_Engine_CSS_Rule object by its selector.

Description

If the rule does not exist, it will be created.

Parameters

$selectorstringrequired

The CSS selector.

$rules_groupstringoptional

A parent CSS selector in the case of nested CSS, or a CSS nested @rule, such as @media (min-width: 80rem) or @layer module.

Default:''

Return

Source

public function add_rule( $selector, $rules_group = '' ) {
	$selector    = $selector ? trim( $selector ) : '';
	$rules_group = $rules_group ? trim( $rules_group ) : '';

	// Bail early if there is no selector.
	if ( empty( $selector ) ) {
		return;
	}

	if ( ! empty( $rules_group ) ) {
		if ( empty( $this->rules[ "$rules_group $selector" ] ) ) {
			$this->rules[ "$rules_group $selector" ] = new WP_Style_Engine_CSS_Rule( $selector, array(), $rules_group );
		}
		return $this->rules[ "$rules_group $selector" ];
	}

	// Create the rule if it doesn't exist.
	if ( empty( $this->rules[ $selector ] ) ) {
		$this->rules[ $selector ] = new WP_Style_Engine_CSS_Rule( $selector );
	}

	return $this->rules[ $selector ];
}

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