Composite.php

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<?php

abstract class HTMLPurifier_Strategy_Composite extends HTMLPurifier_Strategy
{

    protected $strategies = array();

    abstract public function __construct();

    public function execute($tokens, $config, $context) {
        foreach ($this->strategies as $strategy) {
            $tokens = $strategy->execute($tokens, $config, $context);
        }
        return $tokens;
    }

}

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