DeferredUpdatesScopeStack.php

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<?php
class DeferredUpdatesScopeStack {
    private $stack;
 
    public function __construct() {
        $this->stack = [ DeferredUpdatesScope::newRootScope() ];
    }
 
    public function current() {
        return $this->stack[count( $this->stack ) - 1];
    }
 
    public function descend( $activeStage, DeferrableUpdate $update ) {
        $scope = DeferredUpdatesScope::newChildScope( $activeStage, $update, $this->current() );
        $this->stack[count( $this->stack )] = $scope;
 
        return $scope;
    }
 
    public function ascend() {
        if ( count( $this->stack ) <= 1 ) {
            throw new LogicException( "Cannot pop root stack scope; something is out of sync" );
        }
 
        return array_pop( $this->stack );
    }
 
    public function getRecursiveDepth() {
        return count( $this->stack ) - 1;
    }
}