Question

我制作了一个名为＆＃34; story_get_adjacent＆＃34;的自定义树枝标签。根据输入ID获取下一篇/上一篇文章。但是对于我的生活，我无法将对象的实际数据拉入标签中以便查找。它总是让我回到名字而不是数据。我知道这可以做到，因为我用set标签测试了它，它返回的数据不是名字。思考????

^{页面上的对象}

Object >>
    Title = "This is a test story"
    StoryID = 1254
    Content ....

^{标签用法示例：}

 {% story_get_adjacent Object.StoryID as adjacent %}

^{Twig Extension：}

class Story_Get_Adjacent_TokenParser extends Twig_TokenParser
{
    public function parse(Twig_Token $token)
    {
        $parser = $this->parser; //story_get_adjacent
        $stream = $parser->getStream(); // space

        $value = $parser->getExpressionParser()->parseExpression(); //story id
        $names = array();
        try {
            $as = $stream->expect(Twig_Token::NAME_TYPE)->getValue(); //as
            $ObjName = $stream->expect(Twig_Token::NAME_TYPE)->getValue(); //object name
            array_push($names, $ObjName);
        } catch (Exception $e) {
            throw new Exception( 'error: ' . $e);
        }
        $stream->expect(Twig_Token::BLOCK_END_TYPE);
        return new Story_Get_Adjacent_Node($names, $value, $token->getLine(), $this->getTag());
    }

    public function getTag()
    {
        return 'story_get_adjacent';
    }
}

^{Twig Extension：}

class Story_Get_Adjacent_Node extends Twig_Node
{
    public function __construct($name, Twig_Node_Expression $value, $line, $tag = null)
    {
        parent::__construct(array('value' => $value), array('name' => $name), $line, $tag);
    }

    public function compile (Twig_Compiler $compiler)
    {
        $Name     = $this->getAttribute('name')[0];
        $StoryAutoID    = $this->getNode('value')->getAttribute('value');

        $compiler->addDebugInfo($this);
        $compiler->write('$context[\''. $Name .'\'] = NewsController::TwigStoryGetAdjacent("'.$StoryAutoID.'");')->raw("\n");
    }
}

Answer 1

Alain Tiemblo解决了你的问题。但是，为什么你的生活如此艰难？为什么不简单地使用树枝功能呢？

{% set adjacent = story_get_adjacent(Object.StoryID) %}

class StoryExtension extends \Twig_Extension
{
    public function getFunctions()
    {
        return array(
            \Twig_SimpleFunction('story_get_adjacent', array($this, 'getAdjacent'), array('is_safe' => array('html'))),
        );
    }

    public function getAdjacent($storyId)
    {
        return NewsController::TwigStoryGetAdjacent($storyId);
    }

    public function getName()
    {
        return 'story';
    }
}

（is_safe选项告诉twig它的安全HTML，因此您在使用{{ story_get_adjacent(Object.StoryID) }}时不必禁用转义。

Answer 2

当您尝试访问表达式的value属性时，问题出在编译器中。

需要将表达式解析器子编译为PHP中的表达式。
由于编译后的表达式是未评估的表达式，因此在调用'时不应放置引号（TwigStoryGetAdjacent）。

尝试使用以下类：

<?php

class Story_Get_Adjacent_Node extends Twig_Node
{

    public function __construct($name, Twig_Node_Expression $value, $line, $tag = null)
    {
        parent::__construct(array ('value' => $value), array ('name' => $name), $line, $tag);
    }

    public function compile(Twig_Compiler $compiler)
    {
        $Name = reset($this->getAttribute('name'));

        $compiler->addDebugInfo($this);
        $compiler
           ->write("\$context['$Name'] = NewsController::TwigStoryGetAdjacent(")
           ->subcompile($this->getNode('value'))
           ->write(");")
           ->raw("\n")
        ;
    }

}

工作演示

test.php的

<?php

require(__DIR__ . '/vendor/autoload.php');

require("TestExtension.php");
require("TestTokenParser.php");
require("TestNode.php");

class NewsController
{

    static public function TwigStoryGetAdjacent($id)
    {
        return "I return the story ID = {$id}.";
    }

}

$loader = new Twig_Loader_Filesystem('./');
$twig = new Twig_Environment($loader, array (
        'cache' => __DIR__ . '/gen'
));

$object = new \stdClass;
$object->StoryID = 42;

$twig->addExtension(new Test_Extension());
echo $twig->render("test.twig", array ('Object' => $object));

test.twig

{% story_get_adjacent Object.StoryID as adjacent %}
{{ adjacent }}

TestExtension.php

<?php

class Test_Extension extends \Twig_Extension
{

    public function getTokenParsers()
    {
        return array (
                new Test_TokenParser(),
        );
    }

    public function getName()
    {
        return 'test';
    }

}

TestTokenParser.php

<?php

class Test_TokenParser extends Twig_TokenParser
{
    public function parse(Twig_Token $token)
    {
        $parser = $this->parser; //story_get_adjacent
        $stream = $parser->getStream(); // space

        $value = $parser->getExpressionParser()->parseExpression(); //story id
        $names = array();
        try {
            $as = $stream->expect(Twig_Token::NAME_TYPE)->getValue(); //as
            $ObjName = $stream->expect(Twig_Token::NAME_TYPE)->getValue(); //object name
            array_push($names, $ObjName);
        } catch (Exception $e) {
            throw new Exception( 'error: ' . $e);
        }
        $stream->expect(Twig_Token::BLOCK_END_TYPE);
        return new Test_Node($names, $value, $token->getLine(), $this->getTag());
    }

    public function getTag()
    {
        return 'story_get_adjacent';
    }
}

TestNode.php

<?php

class Test_Node extends Twig_Node
{

    public function __construct($name, Twig_Node_Expression $value, $line, $tag = null)
    {
        parent::__construct(array ('value' => $value), array ('name' => $name), $line, $tag);
    }

    public function compile(Twig_Compiler $compiler)
    {
        $Name = reset($this->getAttribute('name'));

        $compiler->addDebugInfo($this);
        $compiler
           ->write("\$context['$Name'] = NewsController::TwigStoryGetAdjacent(")
           ->subcompile($this->getNode('value'))
           ->write(");")
           ->raw("\n")
        ;
    }

}

运行

$ composer require "twig/twig" "~1.0"
$ php test.php

结果

I return the story ID = 42.

奖金 与模板对应的已编译的doDisplay方法

    protected function doDisplay(array $context, array $blocks = array())
    {
        // line 1
        $context['adjacent'] = NewsController::TwigStoryGetAdjacent($this->getAttribute((isset($context["Object"]) ? $context["Object"] : null), "StoryID", array())        );
        // line 2
        echo twig_escape_filter($this->env, (isset($context["adjacent"]) ? $context["adjacent"] : null), "html", null, true);
    }

Twig：将对象变量从页面拉到自定义标签

2 个答案:

工作演示