Created
May 7, 2012 13:21
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A template helper to print HTML-Classes to each element in a loop which matches the CSS nth-child syntax
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| <?php | |
| declare( encoding='UTF-8' ); | |
| /** | |
| * A template helper to print class-names | |
| * to eacht element, matches the equation xn+y | |
| * | |
| * @author David Naber <kontakt@dnaber.de> | |
| */ | |
| class Nth_Child_Class { | |
| /** | |
| * the index | |
| * | |
| * @var int | |
| */ | |
| protected $i = 0; | |
| /** | |
| * equation parts | |
| * | |
| * @var string | |
| */ | |
| protected $equ = array(); | |
| /** | |
| * the class to print | |
| * | |
| * @var string | |
| */ | |
| protected $class_name = ''; | |
| /** | |
| * constructor | |
| * | |
| * @param string $equ ( has to match the synax xn+y | x,y ∈ ℤ ) | |
| * @return MP_Loop_Count | |
| */ | |
| public function __construct( $equ = '', $class_name = 'border' ) { | |
| $this->class_name = $class_name; | |
| $this->equ[ 'x' ] = 1; | |
| $this->equ[ 'y' ] = 0; | |
| $this->equ[ 'c' ] = 0; | |
| if ( ! empty ( $equ ) && is_string( $equ ) ) { | |
| $matches = array(); | |
| if ( preg_match( '~^(-?\d*)n?([+|-]\s?\d+)?$~', $equ, $matches ) ) { | |
| if ( ! empty( $matches[ 1 ] ) ) { | |
| if ( '-' === $matches[ 1 ] ) | |
| $this->equ[ 'x' ] = -1; | |
| else | |
| $this->equ[ 'x' ] = ( int ) $matches[ 1 ]; | |
| } | |
| if ( ! empty( $matches[ 2 ] ) ) | |
| $this->equ[ 'y' ] = ( int ) $matches[ 2 ]; | |
| if ( FALSE === strpos( $matches[ 0 ], 'n' ) ) | |
| $this->equ[ 'c' ] = $this->equ[ 'x' ]; | |
| } | |
| } | |
| } | |
| /** | |
| * get the class on every cycle that matches the equation | |
| * | |
| * @param string $class_name (optional) | |
| * @return string | |
| */ | |
| public function get_class( $class_name = '' ) { | |
| if ( empty( $class_name ) ) | |
| $class_name = $this->class_name; | |
| $p = -1; | |
| $this->i ++; | |
| if ( 0 < $this->equ[ 'c' ] ) { | |
| if ( $this->i === $this->equ[ 'c' ] ) | |
| return $class_name; | |
| return ''; | |
| } | |
| $p = ( $this->i - $this->equ[ 'y' ] ) / $this->equ[ 'x' ] ; | |
| if ( is_int( $p ) && $p > -1 ) | |
| return $class_name; | |
| return ''; | |
| } | |
| /** | |
| * print the class | |
| * | |
| * @param string $class (Optional) | |
| * @return void | |
| */ | |
| public function print_class( $class_name = '' ) { | |
| echo $this->get_class( $class_name ); | |
| } | |
| } |
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| <?php | |
| include './class-Nth_Child_Class.php'; | |
| $nth_child = new Nth_Child_Class( 'n+4' ); | |
| ?><!DOCTYPE html> | |
| <html lang="de" dir="ltr"> | |
| <meta charset="utf-8"> | |
| <title>Get Classes instead of nth-child-selector</title> | |
| <style> | |
| li:nth-child( n+4 ){ | |
| background: green; | |
| } | |
| </style> | |
| <ul> | |
| <?php for ( $i = 1; $i <= 20; $i++ ) : ?> | |
| <li> | |
| <?php $nth_child->print_class( "I'm green" ); ?> | |
| </li> | |
| <?php endfor; ?> | |
| </ul> | |
| </html> |
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