Update to drupal 8.0.0-rc1. For more information, see https://www.drupal.org/node/2582663

vendor/composer/installers/src/Composer/Installers/BaseInstaller.php

@@ -0,0 +1,131 @@
+<?php
+namespace Composer\Installers;
+
+use Composer\Composer;
+use Composer\Package\PackageInterface;
+
+abstract class BaseInstaller
+{
+    protected $locations = array();
+    protected $composer;
+    protected $package;
+
+    /**
+     * Initializes base installer.
+     *
+     * @param PackageInterface $package
+     * @param Composer         $composer
+     */
+    public function __construct(PackageInterface $package = null, Composer $composer = null)
+    {
+        $this->composer = $composer;
+        $this->package = $package;
+    }
+
+    /**
+     * Return the install path based on package type.
+     *
+     * @param  PackageInterface $package
+     * @param  string           $frameworkType
+     * @return string
+     */
+    public function getInstallPath(PackageInterface $package, $frameworkType = '')
+    {
+        $type = $this->package->getType();
+
+        $prettyName = $this->package->getPrettyName();
+        if (strpos($prettyName, '/') !== false) {
+            list($vendor, $name) = explode('/', $prettyName);
+        } else {
+            $vendor = '';
+            $name = $prettyName;
+        }
+
+        $availableVars = $this->inflectPackageVars(compact('name', 'vendor', 'type'));
+
+        $extra = $package->getExtra();
+        if (!empty($extra['installer-name'])) {
+            $availableVars['name'] = $extra['installer-name'];
+        }
+
+        if ($this->composer->getPackage()) {
+            $extra = $this->composer->getPackage()->getExtra();
+            if (!empty($extra['installer-paths'])) {
+                $customPath = $this->mapCustomInstallPaths($extra['installer-paths'], $prettyName, $type);
+                if ($customPath !== false) {
+                    return $this->templatePath($customPath, $availableVars);
+                }
+            }
+        }
+
+        $packageType = substr($type, strlen($frameworkType) + 1);
+        $locations = $this->getLocations();
+        if (!isset($locations[$packageType])) {
+            throw new \InvalidArgumentException(sprintf('Package type "%s" is not supported', $type));
+        }
+
+        return $this->templatePath($locations[$packageType], $availableVars);
+    }
+
+    /**
+     * For an installer to override to modify the vars per installer.
+     *
+     * @param  array $vars
+     * @return array
+     */
+    public function inflectPackageVars($vars)
+    {
+        return $vars;
+    }
+
+    /**
+     * Gets the installer's locations
+     *
+     * @return array
+     */
+    public function getLocations()
+    {
+        return $this->locations;
+    }
+
+    /**
+     * Replace vars in a path
+     *
+     * @param  string $path
+     * @param  array  $vars
+     * @return string
+     */
+    protected function templatePath($path, array $vars = array())
+    {
+        if (strpos($path, '{') !== false) {
+            extract($vars);
+            preg_match_all('@\{\$([A-Za-z0-9_]*)\}@i', $path, $matches);
+            if (!empty($matches[1])) {
+                foreach ($matches[1] as $var) {
+                    $path = str_replace('{$' . $var . '}', $$var, $path);
+                }
+            }
+        }
+
+        return $path;
+    }
+
+    /**
+     * Search through a passed paths array for a custom install path.
+     *
+     * @param  array  $paths
+     * @param  string $name
+     * @param  string $type
+     * @return string
+     */
+    protected function mapCustomInstallPaths(array $paths, $name, $type)
+    {
+        foreach ($paths as $path => $names) {
+            if (in_array($name, $names) || in_array('type:' . $type, $names)) {
+                return $path;
+            }
+        }
+
+        return false;
+    }
+}