php - Twig 内部结构 : setCompiler

Question

我在从默认编译器正确更改为自定义编译器时遇到问题。看来我可能没有正确创建类或对象。

来自 http://twig.sensiolabs.org/doc/internals.html“可以通过调用 setCompiler() 方法更改默认编译器 (Twig_Compiler):$twig->setCompiler($compiler);”

这是我尝试更改编译器的地方:

\Twig_Autoloader::register();
$loader = new \Twig_Loader_Filesystem($templateDirectory);
$twig = new \Twig_Environment($loader);

$compiler = new Config_Generator_Twig_Compiler($twig);
$twig->setCompiler($compiler);

但是我得到这个错误:

PHP Catchable fatal error: Argument 1 passed to Twig_Node_Module::compile() must be an instance of Twig_Compiler, instance of Config_Generator_Twig_Compiler given, called in /config_generator/Config_Generator_Twig_Compiler.php on line 87 and defined in /config_generator/lib/Twig/Node/Module.php on line 36

---

“Config_Generator_Twig_Compiler.php”只是 Twig 文件“Compiler.php”的一个副本，在顶部更改了几行:

<?php
require_once $rootDirectory.'/lib/Twig/CompilerInterface.php'; <---- added this line

class Config_Generator_Twig_Compiler implements Twig_CompilerInterface <---- changed from "class Twig_Compiler implements Twig_CompilerInterface"

此文件的其余部分当前与“Compiler.php”相同:

{...
  public function compile(Twig_NodeInterface $node, $indentation = 0)
  {
      $this->lastLine = null;
      $this->source = '';
      $this->sourceOffset = 0;
      // source code starts at 1 (as we then increment it when we encounter                                     new lines)
      $this->sourceLine = 1;
      $this->indentation = $indentation;

      if ($node instanceof Twig_Node_Module) {
          $this->filename = $node->getAttribute('filename');
      }

      $node->compile($this); <---- here's line 87

      return $this;
  }
...}

Answer 1

$twig->setCompiler($object) 需要 $object 扩展或者是一个 Twig_Compiler。
因此，您的类(class)必须扩展它。

class Config_Generator_Twig_Compiler extends Twig_Compiler 
{

    [... your code here ...]

}

Twig_Compiler 已经实现了 Twig_CompilerInterface。