如何通过 Script\Event 获取作曲家自动加载类映射？答案

【问题标题】：How to get composer autoload classmap via Script\Event?如何通过 Script\Event 获取作曲家自动加载类映射？
【发布时间】：2019-09-12 23:48:49
【问题描述】：

我目前通过明确要求文件来获取自动加载类映射

$map = require 'vendor/composer/autoload_classmap.php';

但是我的班级已经在导入 Composer\Script\Event 班级并使用 Composer 实例

<?php

namespace Acme;

use Composer\Script\Event;

class Foo
{
   public static function bar(Event $event)
   {
      $extra = $event->getComposer()->getPackage()->getExtra();
      $autoload = $event->getComposer()->getPackage()->getAutoload();
   }
}

如何像获取 $extra 和 $autoload 一样获取自动加载类映射？（不使用require）

【问题讨论】：

标签： php composer-php

【解决方案1】：

$event->getComposer()->getPackage()->getAutoload() 是我所知道的从 Composer 对象获取自动加载信息的唯一方法。我使用以下函数来处理getAutoload() 的结果，希望这些信息足以回答您的问题。

function parseAutoload(Event $event)
{
    foreach ($event->getComposer()->getPackage()->getAutoload() as $std => $lookup) {
        switch ($std) {
            case "psr-0":
            case "psr-4":
                foreach ($lookup as $namespace => $paths) {
                    if (substr($namespace, -1) != "\\") {
                        $namespace .= "\\";
                        // TODO Maybe produce a warning?
                    }
                    if (!is_array($paths)) {
                        $paths = array($paths);
                    }
                    foreach ($paths as $path) {
                        if (substr($path, 0, -1) != DIRECTORY_SEPARATOR) {
                            $path .= DIRECTORY_SEPARATOR;
                        }
                        if (is_dir($path)) {
                            $directory = new RecursiveDirectoryIterator($path);
                            $iterator = new RecursiveIteratorIterator($directory);
                            $regex = new RegexIterator($iterator,
                                '/^' . preg_quote($path, DIRECTORY_SEPARATOR) . '(.+)\.php$/i',
                                RegexIterator::REPLACE);
                            $regex->replacement = '$1';
                            foreach ($regex as $file => $class) {
                                $class = "{$namespace}" . str_replace(DIRECTORY_SEPARATOR, "\\", $class);
                                echo "Found class '{$class}' at '{$file}'";
                            }
                        }
                    }
                }
                break;
            case "classmap":
                foreach ($lookup as $class => $path) {
                    echo "Found class '{$class}' at '{$path}'";
                }
                break;
            case "files":
                foreach ($lookup as $i => $path) {
                    if (is_readable($path)) {
                        $code = file_get_contents($path);
                        $tokens = token_get_all($code);
                        // File all the classes in the file.
                        for ($i = 2; $i < count($tokens); $i++) {
                            if ($tokens[$i - 2][0] == T_CLASS &&
                                $tokens[$i - 1][0] == T_WHITESPACE &&
                                $tokens[$i][0] == T_STRING
                            ) {
                                $class = $tokens[$i][1];
                                echo "Found class '{$class}' at '{$path}'";
                            }
                        }
                    }
                }
                break;
            default:
                // TODO Maybe produce a warning?
        }
    }
}

【讨论】：