获取树枝模板文件中使用的所有变量

本文介绍了获取树枝模板文件中使用的所有变量的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

是否可以获取树枝模板中使用的所有变量例如:在模板上

Is it possible to get all variables used in a twig template Eg: On template

<!DOCTYPE html>
<html>
    <head>
        <title>My Webpage</title>
    </head>
    <body>
        <ul id="navigation">
        {% for item in navigation %}
            <li><a href="{{ item.href }}">{{ item.caption }}</a></li>
        {% endfor %}
        </ul>

        <h1>My Webpage</h1>
        {{ a_variable }}
    </body>
</html>

现在我需要将上面使用的所有变量作为一个数组获取，例如

Now i need to get all variables used in the above as an array like

Array(1=>'navigation',2=>'a_variable')

最好由树枝自身解决

推荐答案

您好，我听说您喜欢Twig，所以我写了一个正则表达式，以便您在解析时可以解析:

Yo dawg, I heard you like Twig so I wrote a regex so you can parse while you parse:

\{\{(?!%)\s* # Starts with {{ not followed by % followed by 0 or more spaces
      ((?:(?!\.)[^\s])*) # Match anything without a point or space in it
\s*(?<!%)\}\} # Ends with 0 or more spaces not followed by % ending with }}
| # Or
\{%\s* # Starts with {% followed by 0 or more spaces
      (?:\s(?!endfor)(\w+))+ # Match the last word which can not be endfor
\s*%\} # Ends with 0 or more spaces followed by %}
# Flags: i: case insensitive matching | x: Turn on free-spacing mode to ignore whitespace between regex tokens, and allow # comments.

$string = '<!DOCTYPE html>
<html>
    <head>
        <title>My Webpage</title>
    </head>
    <body>
        <ul id="navigation">
        {% for item in navigation %}
            <li><a href="{{ item.href }}">{{ item.caption }}</a></li>
        {% endfor %}
        </ul>

        <h1>My Webpage</h1>
        {{ a_variable }}
    </body>
</html>';

preg_match_all('/\{\{(?!%)\s*((?:(?!\.)[^\s])*)\s*(?<!%)\}\}|\{%\s*(?:\s(?!endfor)(\w+))+\s*%\}/i', $string, $m);
$m = array_map('array_filter', $m); // Remove empty values
array_shift($m); // Remove first index [0]
print_r($m); // Print results

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