<?php

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namespace Elementor;

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if ( ! defined( 'ABSPATH' ) ) {

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exit; // Exit if accessed directly.

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}

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/**

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* Elementor stylesheet.

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*

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* Elementor stylesheet handler class responsible for setting up CSS rules and

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* properties, and all the CSS `@media` rule with supported viewport width.

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*

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* @since 1.0.0

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*/

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class Stylesheet {

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/**

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* CSS Rules.

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*

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* Holds the list of CSS rules.

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*

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* @since 1.0.0

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* @access private

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*

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* @var array A list of CSS rules.

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*/

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private $rules = [];

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/**

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* Devices.

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*

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* Holds the list of devices.

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*

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* @since 1.0.0

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* @access private

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*

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* @var array A list of devices.

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*/

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private $devices = [];

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/**

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* Raw CSS.

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*

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* Holds the raw CSS.

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*

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* @since 1.0.0

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* @access private

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*

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* @var array The raw CSS.

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*/

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private $raw = [];

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/**

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* Parse CSS rules.

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*

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* Goes over the list of CSS rules and generates the final CSS.

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*

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* @since 1.0.0

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* @access public

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* @static

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*

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* @param array $rules CSS rules.

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*

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* @return string Parsed rules.

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*/

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public static function parse_rules( array $rules ) {

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$parsed_rules = '';

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foreach ( $rules as $selector => $properties ) {

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$selector_content = self::parse_properties( $properties );

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if ( $selector_content ) {

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$parsed_rules .= $selector . '{' . $selector_content . '}';

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}

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}

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return $parsed_rules;

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}

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/**

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* Parse CSS properties.

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*

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* Goes over the selector properties and generates the CSS of the selector.

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*

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* @since 1.0.0

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* @access public

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* @static

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*

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* @param array $properties CSS properties.

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*

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* @return string Parsed properties.

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*/

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public static function parse_properties( array $properties ) {

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$parsed_properties = '';

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foreach ( $properties as $property_key => $property_value ) {

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if ( '' !== $property_value ) {

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$parsed_properties .= $property_key . ':' . $property_value . ';';

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}

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}

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return $parsed_properties;

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}

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/**

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* Add device.

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*

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* Add a new device to the devices list.

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*

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* @since 1.0.0

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* @access public

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*

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* @param string $device_name Device name.

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* @param string $device_max_point Device maximum point.

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*

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* @return Stylesheet The current stylesheet class instance.

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*/

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public function add_device( $device_name, $device_max_point ) {

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$this->devices[ $device_name ] = $device_max_point;

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asort( $this->devices );

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return $this;

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}

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/**

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* Add rules.

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*

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* Add a new CSS rule to the rules list.

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*

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* @since 1.0.0

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* @access public

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*

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* @param string $selector CSS selector.

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* @param array|string $style_rules Optional. Style rules. Default is `null`.

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* @param array $query Optional. Media query. Default is `null`.

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*

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* @return Stylesheet The current stylesheet class instance.

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*/

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public function add_rules( $selector, $style_rules = null, array $query = null ) {

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$query_hash = 'all';

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if ( $query ) {

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$query_hash = $this->query_to_hash( $query );

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}

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if ( ! isset( $this->rules[ $query_hash ] ) ) {

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$this->add_query_hash( $query_hash );

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}

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if ( null === $style_rules ) {

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preg_match_all( '/([^\s].+?(?=\{))\{((?s:.)+?(?=}))}/', $selector, $parsed_rules );

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foreach ( $parsed_rules[1] as $index => $selector ) {

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$this->add_rules( $selector, $parsed_rules[2][ $index ], $query );

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}

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return $this;

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}

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if ( ! isset( $this->rules[ $query_hash ][ $selector ] ) ) {

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$this->rules[ $query_hash ][ $selector ] = [];

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}

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if ( is_string( $style_rules ) ) {

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$style_rules = array_filter( explode( ';', trim( $style_rules ) ) );

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$ordered_rules = [];

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foreach ( $style_rules as $rule ) {

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$property = explode( ':', $rule, 2 );

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if ( count( $property ) < 2 ) {

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return $this;

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}

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$ordered_rules[ trim( $property[0] ) ] = trim( $property[1], ' ;' );

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}

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$style_rules = $ordered_rules;

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}

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$this->rules[ $query_hash ][ $selector ] = array_merge( $this->rules[ $query_hash ][ $selector ], $style_rules );

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return $this;

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}

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/**

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* Add raw CSS.

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*

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* Add a raw CSS rule.

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*

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* @since 1.0.8

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* @access public

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*

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* @param string $css The raw CSS.

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* @param string $device Optional. The device. Default is empty.

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*

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* @return Stylesheet The current stylesheet class instance.

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*/

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public function add_raw_css( $css, $device = '' ) {

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if ( ! isset( $this->raw[ $device ] ) ) {

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$this->raw[ $device ] = [];

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}

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$this->raw[ $device ][] = trim( $css );

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return $this;

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}

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/**

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* Get CSS rules.

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*

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* Retrieve the CSS rules.

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*

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* @since 1.0.5

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* @access public

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*

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* @param string $device Optional. The device. Default is empty.

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* @param string $selector Optional. CSS selector. Default is empty.

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* @param string $property Optional. CSS property. Default is empty.

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*

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* @return null|array CSS rules, or `null` if not rules found.

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*/

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public function get_rules( $device = null, $selector = null, $property = null ) {

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if ( ! $device ) {

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return $this->rules;

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}

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if ( $property ) {

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return isset( $this->rules[ $device ][ $selector ][ $property ] ) ? $this->rules[ $device ][ $selector ][ $property ] : null;

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}

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if ( $selector ) {

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return isset( $this->rules[ $device ][ $selector ] ) ? $this->rules[ $device ][ $selector ] : null;

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}

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return isset( $this->rules[ $device ] ) ? $this->rules[ $device ] : null;

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}

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/**

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* To string.

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*

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* This magic method responsible for parsing the rules into one CSS string.

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*

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* @since 1.0.0

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* @access public

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*

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* @return string CSS style.

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*/

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public function __toString() {

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$style_text = '';

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foreach ( $this->rules as $query_hash => $rule ) {

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$device_text = self::parse_rules( $rule );

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if ( 'all' !== $query_hash ) {

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$device_text = $this->get_query_hash_style_format( $query_hash ) . '{' . $device_text . '}';

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}

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$style_text .= $device_text;

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}

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foreach ( $this->raw as $device_name => $raw ) {

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$raw = implode( "\n", $raw );

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if ( $raw && isset( $this->devices[ $device_name ] ) ) {

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$raw = '@media(max-width: ' . $this->devices[ $device_name ] . 'px){' . $raw . '}';

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}

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$style_text .= $raw;

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}

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return $style_text;

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}

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/**

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* Query to hash.

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*

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* Turns the media query into a hashed string that represents the query

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* endpoint in the rules list.

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*

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* @since 1.2.0

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* @access private

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*

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* @param array $query CSS media query.

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*

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* @return string Hashed string of the query.

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*/

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private function query_to_hash( array $query ) {

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$hash = [];

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foreach ( $query as $endpoint => $value ) {

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$hash[] = $endpoint . '_' . $value;

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}

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return implode( '-', $hash );

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}

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/**

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* Hash to query.

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*

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* Turns the hashed string to an array that contains the data of the query

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* endpoint.

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*

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* @since 1.2.0

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* @access private

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*

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* @param string $hash Hashed string of the query.

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*

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* @return array Media query data.

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*/

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private function hash_to_query( $hash ) {

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$query = [];

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$hash = array_filter( explode( '-', $hash ) );

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foreach ( $hash as $single_query ) {

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preg_match( '/(min|max)_(.*)/', $single_query, $query_parts );

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$end_point = $query_parts[1];

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$device_name = $query_parts[2];

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$query[ $end_point ] = 'max' === $end_point ? $this->devices[ $device_name ] : Plugin::$instance->breakpoints->get_device_min_breakpoint( $device_name );

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}

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return $query;

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}

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/**

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* Add query hash.

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*

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* Register new endpoint query and sort the rules the way they should be

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* displayed in the final stylesheet based on the device and the viewport

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* width.

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*

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* @since 1.2.0

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* @access private

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*

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* @param string $query_hash Hashed string of the query.

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*/

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private function add_query_hash( $query_hash ) {

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$this->rules[ $query_hash ] = [];

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uksort(

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$this->rules, function( $a, $b ) {

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if ( 'all' === $a ) {

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return -1;

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}

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if ( 'all' === $b ) {

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return 1;

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}

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$a_query = $this->hash_to_query( $a );

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$b_query = $this->hash_to_query( $b );

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if ( isset( $a_query['min'] ) xor isset( $b_query['min'] ) ) {

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return 1;

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}

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if ( isset( $a_query['min'] ) ) {

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$range = $a_query['min'] - $b_query['min'];

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if ( $range ) {

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return $range;

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}

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$a_has_max = isset( $a_query['max'] );

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if ( $a_has_max xor isset( $b_query['max'] ) ) {

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return $a_has_max ? 1 : -1;

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}

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if ( ! $a_has_max ) {

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return 0;

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}

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}

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return $b_query['max'] - $a_query['max'];

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}

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);

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}

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/**

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* Get query hash style format.

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*

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* Retrieve formatted media query rule with the endpoint width settings.

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*

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* The method returns the CSS `@media` rule and supported viewport width in

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* pixels. It can also handle multiple width endpoints.

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*

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* @since 1.2.0

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* @access private

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*

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* @param string $query_hash The hash of the query.

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*

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* @return string CSS media query.

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*/

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private function get_query_hash_style_format( $query_hash ) {

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$query = $this->hash_to_query( $query_hash );

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$style_format = [];

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foreach ( $query as $end_point => $value ) {

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$style_format[] = '(' . $end_point . '-width:' . $value . 'px)';

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}

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return '@media' . implode( ' and ', $style_format );

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}

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}

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