1: <?php
  2: 
  3: /**
  4:  * This file is part of the Latte (https://latte.nette.org)
  5:  * Copyright (c) 2008 David Grudl (https://davidgrudl.com)
  6:  */
  7: 
  8: namespace Latte\Runtime;
  9: 
 10: use Latte;
 11: 
 12: 
 13: /**
 14:  * Snippet driver
 15:  * @internal
 16:  */
 17: class SnippetDriver
 18: {
 19:     use Latte\Strict;
 20: 
 21:     const TYPE_STATIC = 'static',
 22:         TYPE_DYNAMIC = 'dynamic',
 23:         TYPE_AREA = 'area';
 24: 
 25:     /** @var array */
 26:     private $stack = [];
 27: 
 28:     /** @var int */
 29:     private $nestingLevel = 0;
 30: 
 31:     /** @var bool */
 32:     private $renderingSnippets = false;
 33: 
 34:     /** @var ISnippetBridge */
 35:     private $bridge;
 36: 
 37: 
 38:     public function __construct(ISnippetBridge $bridge)
 39:     {
 40:         $this->bridge = $bridge;
 41:     }
 42: 
 43: 
 44:     public function enter($name, $type)
 45:     {
 46:         if (!$this->renderingSnippets) {
 47:             return;
 48:         }
 49:         $obStarted = false;
 50:         if (
 51:             ($this->nestingLevel === 0 && $this->bridge->needsRedraw($name))
 52:             || ($type === self::TYPE_DYNAMIC && ($previous = end($this->stack)) && $previous[1] === true)
 53:         ) {
 54:             ob_start(function () {});
 55:             $this->nestingLevel = $type === self::TYPE_AREA ? 0 : 1;
 56:             $obStarted = true;
 57:         } elseif ($this->nestingLevel > 0) {
 58:             $this->nestingLevel++;
 59:         }
 60:         $this->stack[] = [$name, $obStarted];
 61:         $this->bridge->markRedrawn($name);
 62:     }
 63: 
 64: 
 65:     public function leave()
 66:     {
 67:         if (!$this->renderingSnippets) {
 68:             return;
 69:         }
 70:         list($name, $obStarted) = array_pop($this->stack);
 71:         if ($this->nestingLevel > 0 && --$this->nestingLevel === 0) {
 72:             $content = ob_get_clean();
 73:             $this->bridge->addSnippet($name, $content);
 74:         } elseif ($obStarted) { // dynamic snippet wrapper or snippet area
 75:             ob_end_clean();
 76:         }
 77:     }
 78: 
 79: 
 80:     public function getHtmlId($name)
 81:     {
 82:         return $this->bridge->getHtmlId($name);
 83:     }
 84: 
 85: 
 86:     public function renderSnippets(array $blocks, array $params)
 87:     {
 88:         if ($this->renderingSnippets || !$this->bridge->isSnippetMode()) {
 89:             return false;
 90:         }
 91:         $this->renderingSnippets = true;
 92:         $this->bridge->setSnippetMode(false);
 93:         foreach ($blocks as $name => $function) {
 94:             if ($name[0] !== '_' || !$this->bridge->needsRedraw(substr($name, 1))) {
 95:                 continue;
 96:             }
 97:             $function = reset($function);
 98:             $function($params);
 99:         }
100:         $this->bridge->setSnippetMode(true);
101:         $this->bridge->renderChildren();
102:         return true;
103:     }
104: }
105: