Config.php

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<?php
namespace Elgg\Amd;

class Config {
    private $baseUrl = '';
    private $paths = array();
    private $shim = array();
    private $dependencies = array();

    public function setBaseUrl($url) {
        $this->baseUrl = $url;
    }

    public function addPath($name, $path) {
        if (preg_match("/\.js$/", $path)) {
            $path = preg_replace("/\.js$/", '', $path);
        }

        if (!isset($this->paths[$name])) {
            $this->paths[$name] = array();
        }

        array_unshift($this->paths[$name], $path);
    }

    public function removePath($name, $path = null) {
        if (!$path) {
            unset($this->paths[$name]);
        } else {
            if (preg_match("/\.js$/", $path)) {
                $path = preg_replace("/\.js$/", '', $path);
            }

            $key = array_search($path, $this->paths[$name]);
            unset($this->paths[$name][$key]);

            if (empty($this->paths[$name])) {
                unset($this->paths[$name]);
            }
        }
    }

    public function addShim($name, array $config) {
        $deps = elgg_extract('deps', $config, array());
        $exports = elgg_extract('exports', $config);

        if (empty($deps) && empty($exports)) {
            throw new \InvalidParameterException("Shimmed modules must have deps or exports");
        }

        $this->shim[$name] = array();

        if (!empty($deps)) {
            $this->shim[$name]['deps'] = $deps;
        }

        if (!empty($exports)) {
            $this->shim[$name]['exports'] = $exports;
        }
    }

    public function hasShim($name) {
        return isset($this->shim[$name]);
    }

    public function removeShim($name) {
        unset($this->shim[$name]);
    }

    public function addDependency($name) {
        $this->dependencies[$name] = true;
    }

    public function removeDependency($name) {
        unset($this->dependencies[$name]);
    }

    public function getDependencies() {
        return array_keys($this->dependencies);
    }

    public function hasDependency($name) {
        return isset($this->dependencies[$name]);
    }

    public function addModule($name, array $config = array()) {
        $url = elgg_extract('url', $config);
        $deps = elgg_extract('deps', $config, array());
        $exports = elgg_extract('exports', $config);

        if (!empty($url)) {
            $this->addPath($name, $url);
        }

        // this is a shimmed module
        // some jQuery modules don't need to export anything when shimmed,
        // so check for deps too
        if (!empty($deps) || !empty($exports)) {
            $this->addShim($name, $config);
        } else {
            $this->addDependency($name);
        }
    }

    public function removeModule($name) {
        $this->removeDependency($name);
        $this->removeShim($name);
        $this->removePath($name);
    }

    public function hasModule($name) {
        if (in_array($name, $this->getDependencies())) {
            return true;
        }

        if (isset($this->shim[$name])) {
            return true;
        }

        if (isset($this->paths[$name])) {
            return true;
        }

        return false;
    }

    public function getConfig() {
        return array(
            'baseUrl' => $this->baseUrl,
            'paths' => $this->paths,
            'shim' => $this->shim,
            'deps' => $this->getDependencies(),
        );
    }
}