我正在尝试为我的自定义网站系统创建一个自定义 Twig 标签( http://twig.sensiolabs.org/doc/advanced.html#tags )。
通过在模板中使用以下标签:
{% entity '\\Testimonial\\Entity\\Testimonial' with { 'limit' : 2, 'column' : 'created' } %}
自定义标签将从创建的列排序的数据库中加载最后 2 个推荐。好的,到目前为止一切顺利。
对于 TokenParser,我使用了 include 标签中的代码:
class Entity extends Twig_TokenParser
{
public function parse(Twig_Token $token)
{
$object = $this -> parser -> getCurrentToken() -> getValue();
if( empty($object))
{
return;
}
$expr = $this->parser->getExpressionParser()->parseExpression();
$variables = $this->parseArguments();
return new EntityNode( $object, $expr, $variables, $token->getLine(), $this->getTag() );
}
protected function parseArguments()
{
$stream = $this->parser->getStream();
$variables = null;
if ($stream->test(Twig_Token::NAME_TYPE, 'with')) {
$stream->next();
$variables = $this->parser->getExpressionParser()->parseExpression();
}
$stream->expect(Twig_Token::BLOCK_END_TYPE);
return $variables;
}
public function getTag()
{
return "entity";
}
}
对于我从 include 借来的节点和我发现的其他一些示例,结果如下:
class EntityNode extends Twig_Node implements Twig_NodeOutputInterface
{
public function __construct(
$object,
Twig_Node_Expression $expr,
Twig_Node_Expression $variables = null,
$lineno,
$tag = null )
{
parent::__construct(array('expr' => $expr, 'variables' => $variables), array("object" => $object), $lineno, $tag);
}
public function compile(Twig_Compiler $compiler)
{
$compiler->addDebugInfo($this);
$obj = $this->getAttribute('object');
if( !is_callable( $obj ) || !class_exists( $obj ))
{
// error not callable
}
$entities = forward_static_call( array( $obj , "TemplateEntity" ) , $this -> getNode( "variables" ));
$subtemplate = forward_static_call( array( $obj , "TemplateEntityTemplatePath" ));
$template = new Twig_Node_Expression_Constant( $subtemplate , $this -> getLine() );
#return;
$compiler
-> write("\$this->env->loadTemplate(")
-> subcompile($template)
-> raw(")")
;
}
}
结果是来自 Twig 的错误,说它无法加载基本模板:
Parse error: syntax error, unexpected 'echo' (T_ECHO) in /domains/<domain>/lib/framework/vendors/twig/lib/Twig/Environment.php(328) : eval()'d code on line 370
0 - Exception occurred
Exception -- Autoloader could not find base class __TwigTemplate_c56f3794ae5aed2d0cc25529303a838625ded364d30febb96cd025a5d7622121
我知道在 Twig_Node 之前一切正常,问题在于 Twig 如何解析行$compiler
-> write("\$this->env->loadTemplate(")
-> subcompile($template)
-> raw(")")
;
希望能得到大家的帮助;任何帮助表示赞赏!