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<?php

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class ET_Builder_Module_Helper_Multi_Value {

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private static $instance;

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public static function instance() {

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return self::$instance ? self::$instance : ( self::$instance = new self() );

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}

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public function get_delimiter() {

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return '|';

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}

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/**

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* Parses an array and transforms it in an valid multi value array

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* @param array $value

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* @param int $elements

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* @return array

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public function parse( array $value, $elements = null ) {

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$length = (int) $elements;

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if ( ! $elements || count( $value ) === (int) $length ) {

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return $value;

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}

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$new = array();

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for ( $i = 0; $i < (int) $length; $i ++ ) {

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$new[ $i ] = isset( $value[ $i ] ) && $value[ $i ] !== null ? $value[ $i ] : '';

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}

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return array_map( 'strval', $new );

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}

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/**

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* Splits the multi value string in to an array of primitive values

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* User can provide also the required number of elements that value must have

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* In case the array original length will be larger then the required elements number

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* the array will be cut from head to tail

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* In cas the array length will be shorter, the array tail will be filled with empty strings `''`,

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* till array length will match the requested elements number

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* @param string $value

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* @param int $elements

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* @return array

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public function split( $value, $elements = null ) {

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return $this->parse( explode( $this->get_delimiter(), $value ), $elements );

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}

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/**

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* Takes an array and converts it to a valid multi value

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* Provide the `elements` parameter to get the result string of the necessary length

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* @param array $value

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* @param int $elements

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* @return string

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public function to_value( array $value, $elements = null ) {

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return implode( $this->get_delimiter(), $this->parse( $value, $elements ) );

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}

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/**

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* Check if the multi value is not empty.

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* A multi value is empty when all sub values are empty strings

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* @param string $value

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* @return bool

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public function has_value( $value ) {

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return trim( implode( '', $this->split( $value ) ) ) !== '';

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}

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/**

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* Merges two multi values in to one.

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* If value1 nth element is empty, value2 nth element will be used

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* @param $value_1

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* @param $value_2

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* @param int $elements

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* @return string

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public function merge( $value_1, $value_2, $elements = null ) {

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$v1 = $this->split( $value_1, $elements );

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$v2 = $this->split( $value_2, $elements );

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$max = max( count( $v1 ), count( $v2 ) );

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$new = array();

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for ( $i = 0; $i < $max; $i ++ ) {

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$new[ $i ] = ! isset( $v1[ $i ] ) ? $v2[ $i ] : et_builder_get_or( $v1[ $i ], $v2[ $i ] );

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}

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return $this->to_value( $new, $elements );

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}

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/**

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* Sets a value at specific position in provided multiValue.

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* @param int $key

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* @param string $value

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* @param string $motion_value

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* @param int $elements

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* @return string

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public function set( $key, $value, $motion_value, $elements = null ) {

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$arr = $this->split( $motion_value, $elements );

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if ( ! isset( $arr[ $key ] ) ) {

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return $motion_value;

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}

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$arr[ $key ] = $value;

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return implode( $this->get_delimiter(), $arr );

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}

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}

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