brightnucleus / config

src/Config.php

Indentation +184 added lines, -184 removed lines

@@ -32,188 +32,188 @@
 class Config extends AbstractConfig
 {
 
-    /**
-     * The schema of the Config file.
-     *
-     * @var Schema
-     */
-    protected $schema;
-
-    /**
-     * The Validator class that gets asked to do the validation of the config.
-     *
-     * @since 0.1.0
-     *
-     * @var Validator
-     */
-    protected $validator;
-
-    /**
-     * Instantiate the Config object.
-     *
-     * It accepts either an array with the configuration settings, or a
-     * filename pointing to a PHP file it can include.
-     *
-     * @since 0.1.0
-     * @since 0.1.6 Accepts a delimiter to parse configuration keys.
-     *
-     * @param array|string         $config    Array with settings or filename for the
-     *                                        settings file.
-     * @param Schema|null          $schema    Optional. Config that contains default
-     *                                        values that can get overwritten.
-     * @param Validator|null       $validator Optional. Validator class that does the
-     *                                        actual validation.
-     * @param string[]|string|null $delimiter A string or array of strings that are used as delimiters to parse
-     *                                        configuration keys. Defaults to "\", "/" & ".".
-     *
-     * @throws InvalidConfigurationSourceException If the config source is not a string or array.
-     * @throws FailedToInstantiateParentException  If the parent class could not be instantiated.
-     * @throws FailedToLoadConfigException         If loading of the config source failed.
-     * @throws FailedToResolveConfigException      If the config file could not be resolved.
-     * @throws InvalidConfigException              If the config file is not valid.
-     */
-    public function __construct(
-        $config,
-        Schema $schema = null,
-        Validator $validator = null,
-        $delimiter = null
-    ) {
-        $this->schema    = $schema;
-        $this->validator = $validator;
-
-        // Make sure $config is either a string or array.
-        if (! (is_string($config) || is_array($config))) {
-            throw new InvalidConfigurationSourceException(
-                sprintf(
-                    _('Invalid configuration source: %1$s'),
-                    print_r($config, true)
-                )
-            );
-        }
-
-        if (is_string($config)) {
-            $config = Loader::load($config);
-        }
-
-        // Run the $config through the OptionsResolver.
-        $config = $this->resolveOptions($config);
-
-        // Instantiate the parent class.
-        try {
-            parent::__construct($config, $delimiter);
-        } catch (Exception $exception) {
-            throw new FailedToInstantiateParentException(
-                sprintf(
-                    _('Could not instantiate the configuration through its parent. Reason: %1$s'),
-                    $exception->getMessage()
-                )
-            );
-        }
-
-        // Finally, validate the resulting config.
-        if (! $this->isValid()) {
-            throw new InvalidConfigException(
-                sprintf(
-                    _('ConfigInterface file is not valid: %1$s'),
-                    print_r($config, true)
-                )
-            );
-        }
-    }
-
-    /**
-     * Validate the Config file.
-     *
-     * @since  0.1.0
-     *
-     * @return boolean
-     */
-    public function isValid()
-    {
-        if ($this->validator) {
-            return $this->validator->isValid($this);
-        }
-
-        return true;
-    }
-
-    /**
-     * Process the passed-in defaults and merge them with the new values, while
-     * checking that all required options are set.
-     *
-     * @since 0.1.0
-     *
-     * @param array $config Configuration settings to resolve.
-     *
-     * @return array Resolved configuration settings.
-     * @throws FailedToResolveConfigException If there are errors while resolving the options.
-     */
-    protected function resolveOptions($config)
-    {
-        if (! $this->schema) {
-            return $config;
-        }
-
-        try {
-            $resolver = new OptionsResolver();
-            if ($this->configureOptions($resolver)) {
-                $config = $resolver->resolve($config);
-            }
-        } catch (Exception $exception) {
-            throw new FailedToResolveConfigException(
-                sprintf(
-                    _('Error while resolving config options: %1$s'),
-                    $exception->getMessage()
-                )
-            );
-        }
-
-        return $config;
-    }
-
-    /**
-     * Configure the possible and required options for the Config.
-     *
-     * This should return a bool to let the resolve_options() know whether the
-     * actual resolving needs to be done or not.
-     *
-     * @since 0.1.0
-     *
-     * @param OptionsResolver $resolver Reference to the OptionsResolver
-     *                                  instance.
-     *
-     * @return bool Whether to do the resolving.
-     * @throws FailedToResolveConfigException If there are errors while processing.
-     */
-    protected function configureOptions(OptionsResolver $resolver)
-    {
-        $defined  = $this->schema->getDefinedOptions();
-        $defaults = $this->schema->getDefaultOptions();
-        $required = $this->schema->getRequiredOptions();
-
-        if (! $defined && ! $defaults && ! $required) {
-            return false;
-        }
-
-        try {
-            if ($defined) {
-                $resolver->setDefined($defined);
-            }
-            if ($defaults) {
-                $resolver->setDefaults($defaults);
-            }
-            if ($required) {
-                $resolver->setRequired($required);
-            }
-        } catch (Exception $exception) {
-            throw new FailedToResolveConfigException(
-                sprintf(
-                    _('Error while processing config options: %1$s'),
-                    $exception->getMessage()
-                )
-            );
-        }
-
-        return true;
-    }
+	/**
+	 * The schema of the Config file.
+	 *
+	 * @var Schema
+	 */
+	protected $schema;
+
+	/**
+	 * The Validator class that gets asked to do the validation of the config.
+	 *
+	 * @since 0.1.0
+	 *
+	 * @var Validator
+	 */
+	protected $validator;
+
+	/**
+	 * Instantiate the Config object.
+	 *
+	 * It accepts either an array with the configuration settings, or a
+	 * filename pointing to a PHP file it can include.
+	 *
+	 * @since 0.1.0
+	 * @since 0.1.6 Accepts a delimiter to parse configuration keys.
+	 *
+	 * @param array|string         $config    Array with settings or filename for the
+	 *                                        settings file.
+	 * @param Schema|null          $schema    Optional. Config that contains default
+	 *                                        values that can get overwritten.
+	 * @param Validator|null       $validator Optional. Validator class that does the
+	 *                                        actual validation.
+	 * @param string[]|string|null $delimiter A string or array of strings that are used as delimiters to parse
+	 *                                        configuration keys. Defaults to "\", "/" & ".".
+	 *
+	 * @throws InvalidConfigurationSourceException If the config source is not a string or array.
+	 * @throws FailedToInstantiateParentException  If the parent class could not be instantiated.
+	 * @throws FailedToLoadConfigException         If loading of the config source failed.
+	 * @throws FailedToResolveConfigException      If the config file could not be resolved.
+	 * @throws InvalidConfigException              If the config file is not valid.
+	 */
+	public function __construct(
+		$config,
+		Schema $schema = null,
+		Validator $validator = null,
+		$delimiter = null
+	) {
+		$this->schema    = $schema;
+		$this->validator = $validator;
+
+		// Make sure $config is either a string or array.
+		if (! (is_string($config) || is_array($config))) {
+			throw new InvalidConfigurationSourceException(
+				sprintf(
+					_('Invalid configuration source: %1$s'),
+					print_r($config, true)
+				)
+			);
+		}
+
+		if (is_string($config)) {
+			$config = Loader::load($config);
+		}
+
+		// Run the $config through the OptionsResolver.
+		$config = $this->resolveOptions($config);
+
+		// Instantiate the parent class.
+		try {
+			parent::__construct($config, $delimiter);
+		} catch (Exception $exception) {
+			throw new FailedToInstantiateParentException(
+				sprintf(
+					_('Could not instantiate the configuration through its parent. Reason: %1$s'),
+					$exception->getMessage()
+				)
+			);
+		}
+
+		// Finally, validate the resulting config.
+		if (! $this->isValid()) {
+			throw new InvalidConfigException(
+				sprintf(
+					_('ConfigInterface file is not valid: %1$s'),
+					print_r($config, true)
+				)
+			);
+		}
+	}
+
+	/**
+	 * Validate the Config file.
+	 *
+	 * @since  0.1.0
+	 *
+	 * @return boolean
+	 */
+	public function isValid()
+	{
+		if ($this->validator) {
+			return $this->validator->isValid($this);
+		}
+
+		return true;
+	}
+
+	/**
+	 * Process the passed-in defaults and merge them with the new values, while
+	 * checking that all required options are set.
+	 *
+	 * @since 0.1.0
+	 *
+	 * @param array $config Configuration settings to resolve.
+	 *
+	 * @return array Resolved configuration settings.
+	 * @throws FailedToResolveConfigException If there are errors while resolving the options.
+	 */
+	protected function resolveOptions($config)
+	{
+		if (! $this->schema) {
+			return $config;
+		}
+
+		try {
+			$resolver = new OptionsResolver();
+			if ($this->configureOptions($resolver)) {
+				$config = $resolver->resolve($config);
+			}
+		} catch (Exception $exception) {
+			throw new FailedToResolveConfigException(
+				sprintf(
+					_('Error while resolving config options: %1$s'),
+					$exception->getMessage()
+				)
+			);
+		}
+
+		return $config;
+	}
+
+	/**
+	 * Configure the possible and required options for the Config.
+	 *
+	 * This should return a bool to let the resolve_options() know whether the
+	 * actual resolving needs to be done or not.
+	 *
+	 * @since 0.1.0
+	 *
+	 * @param OptionsResolver $resolver Reference to the OptionsResolver
+	 *                                  instance.
+	 *
+	 * @return bool Whether to do the resolving.
+	 * @throws FailedToResolveConfigException If there are errors while processing.
+	 */
+	protected function configureOptions(OptionsResolver $resolver)
+	{
+		$defined  = $this->schema->getDefinedOptions();
+		$defaults = $this->schema->getDefaultOptions();
+		$required = $this->schema->getRequiredOptions();
+
+		if (! $defined && ! $defaults && ! $required) {
+			return false;
+		}
+
+		try {
+			if ($defined) {
+				$resolver->setDefined($defined);
+			}
+			if ($defaults) {
+				$resolver->setDefaults($defaults);
+			}
+			if ($required) {
+				$resolver->setRequired($required);
+			}
+		} catch (Exception $exception) {
+			throw new FailedToResolveConfigException(
+				sprintf(
+					_('Error while processing config options: %1$s'),
+					$exception->getMessage()
+				)
+			);
+		}
+
+		return true;
+	}
 }

src/ConfigTrait.php

Indentation +92 added lines, -92 removed lines

@@ -25,103 +25,103 @@
 trait ConfigTrait
 {
 
-    /**
-     * Reference to the Config object.
-     *
-     * @since 0.1.2
-     *
-     * @var ConfigInterface
-     */
-    protected $config;
+	/**
+	 * Reference to the Config object.
+	 *
+	 * @since 0.1.2
+	 *
+	 * @var ConfigInterface
+	 */
+	protected $config;
 
-    /**
-     * Process the passed-in configuration file.
-     *
-     * @since 0.1.2
-     *
-     * @param ConfigInterface $config The Config to process.
-     * @param                 string  ... List of keys.
-     *
-     * @throws FailedToProcessConfigException If the arguments could not be parsed into a Config.
-     */
-    protected function processConfig(ConfigInterface $config)
-    {
-        if (func_num_args() > 1) {
-            try {
-                $keys = func_get_args();
-                array_shift($keys);
-                $config = $config->getSubConfig($keys);
-            } catch (Exception $exception) {
-                throw new FailedToProcessConfigException(
-                    sprintf(
-                        _('Could not process the config with the arguments "%1$s".'),
-                        print_r(func_get_args(), true)
-                    )
-                );
-            }
-        }
-        $this->config = $config;
-    }
+	/**
+	 * Process the passed-in configuration file.
+	 *
+	 * @since 0.1.2
+	 *
+	 * @param ConfigInterface $config The Config to process.
+	 * @param                 string  ... List of keys.
+	 *
+	 * @throws FailedToProcessConfigException If the arguments could not be parsed into a Config.
+	 */
+	protected function processConfig(ConfigInterface $config)
+	{
+		if (func_num_args() > 1) {
+			try {
+				$keys = func_get_args();
+				array_shift($keys);
+				$config = $config->getSubConfig($keys);
+			} catch (Exception $exception) {
+				throw new FailedToProcessConfigException(
+					sprintf(
+						_('Could not process the config with the arguments "%1$s".'),
+						print_r(func_get_args(), true)
+					)
+				);
+			}
+		}
+		$this->config = $config;
+	}
 
-    /**
-     * Check whether the Config has a specific key.
-     *
-     * To get a value several levels deep, add the keys for each level as a comma-separated list.
-     *
-     * @since 0.1.2
-     * @since 0.1.5 Accepts list of keys.
-     *
-     * @param string|array $_ List of keys.
-     *
-     * @return bool Whether the key is known.
-     */
-    protected function hasConfigKey($_)
-    {
-        $keys = func_get_args();
+	/**
+	 * Check whether the Config has a specific key.
+	 *
+	 * To get a value several levels deep, add the keys for each level as a comma-separated list.
+	 *
+	 * @since 0.1.2
+	 * @since 0.1.5 Accepts list of keys.
+	 *
+	 * @param string|array $_ List of keys.
+	 *
+	 * @return bool Whether the key is known.
+	 */
+	protected function hasConfigKey($_)
+	{
+		$keys = func_get_args();
 
-        return $this->config->hasKey($keys);
-    }
+		return $this->config->hasKey($keys);
+	}
 
-    /**
-     * Get the Config value for a specific key.
-     *
-     * To get a value several levels deep, add the keys for each level as a comma-separated list.
-     *
-     * @since 0.1.2
-     * @since 0.1.5 Accepts list of keys.
-     *
-     * @param string|array $_ List of keys.
-     *
-     * @return mixed Value of the key.
-     */
-    protected function getConfigKey($_)
-    {
-        $keys = func_get_args();
+	/**
+	 * Get the Config value for a specific key.
+	 *
+	 * To get a value several levels deep, add the keys for each level as a comma-separated list.
+	 *
+	 * @since 0.1.2
+	 * @since 0.1.5 Accepts list of keys.
+	 *
+	 * @param string|array $_ List of keys.
+	 *
+	 * @return mixed Value of the key.
+	 */
+	protected function getConfigKey($_)
+	{
+		$keys = func_get_args();
 
-        return $this->config->getKey($keys);
-    }
+		return $this->config->getKey($keys);
+	}
 
-    /**
-     * Get a (multi-dimensional) array of all the configuration settings.
-     *
-     * @since 0.1.4
-     *
-     * @return array All the configuration settings.
-     */
-    protected function getConfigArray()
-    {
-        return $this->config->getAll();
-    }
+	/**
+	 * Get a (multi-dimensional) array of all the configuration settings.
+	 *
+	 * @since 0.1.4
+	 *
+	 * @return array All the configuration settings.
+	 */
+	protected function getConfigArray()
+	{
+		return $this->config->getAll();
+	}
 
-    /**
-     * Get an array of all the keys that are known by the Config.
-     *
-     * @since 0.1.2
-     *
-     * @return array Array of strings containing all the keys.
-     */
-    protected function getConfigKeys()
-    {
-        return $this->config->getKeys();
-    }
+	/**
+	 * Get an array of all the keys that are known by the Config.
+	 *
+	 * @since 0.1.2
+	 *
+	 * @return array Array of strings containing all the keys.
+	 */
+	protected function getConfigKeys()
+	{
+		return $this->config->getKeys();
+	}
 }

src/AbstractConfig.php

Indentation +217 added lines, -217 removed lines

@@ -26,221 +26,221 @@
 abstract class AbstractConfig extends ArrayObject implements ConfigInterface
 {
 
-    /**
-     * Array of strings that are used as delimiters to parse configuration keys.
-     *
-     * @since 0.1.6
-     *
-     * @var array
-     */
-    protected $delimiter = ['\\', '/', '.'];
-
-    /**
-     * Instantiate the AbstractConfig object.
-     *
-     * @since 0.1.0
-     * @since 0.1.6 Accepts a delimiter to parse configuration keys.
-     *
-     * @param array                $config    Array with settings.
-     * @param string[]|string|null $delimiter A string or array of strings that are used as delimiters to parse
-     *                                        configuration keys. Defaults to "\", "/" & ".".
-     */
-    public function __construct(array $config, $delimiter = null)
-    {
-        // Make sure the config entries can be accessed as properties.
-        parent::__construct($config, ArrayObject::ARRAY_AS_PROPS);
-
-        if (null !== $delimiter) {
-            $this->delimiter = (array)$delimiter;
-        }
-    }
-
-    /**
-     * Get the value of a specific key.
-     *
-     * To get a value several levels deep, add the keys for each level as a comma-separated list.
-     *
-     * @since 0.1.0
-     * @since 0.1.4 Accepts list of keys.
-     *
-     * @param string|array $_ List of keys.
-     *
-     * @return mixed
-     * @throws KeyNotFoundException If an unknown key is requested.
-     */
-    public function getKey($_)
-    {
-        $keys = $this->validateKeys(func_get_args());
-
-        $keys  = array_reverse($keys);
-        $array = $this->getArrayCopy();
-        while (count($keys) > 0) {
-            $key   = array_pop($keys);
-            $array = $array[$key];
-        }
-
-        return $array;
-    }
-
-    /**
-     * Check whether the Config has a specific key.
-     *
-     * To check a value several levels deep, add the keys for each level as a comma-separated list.
-     *
-     * @since 0.1.0
-     * @since 0.1.4 Accepts list of keys.
-     *
-     * @param string|array $_ List of keys.
-     *
-     * @return bool
-     */
-    public function hasKey($_)
-    {
-        try {
-            $keys = array_reverse($this->getKeyArguments(func_get_args()));
-
-            $array = $this->getArrayCopy();
-            while (count($keys) > 0) {
-                $key = array_pop($keys);
-                if (! array_key_exists($key, $array)) {
-                    return false;
-                }
-                $array = $array[$key];
-            }
-        } catch (Exception $exception) {
-            return false;
-        }
-
-        return true;
-    }
-
-    /**
-     * Get a (multi-dimensional) array of all the configuration settings.
-     *
-     * @since 0.1.4
-     *
-     * @return array
-     */
-    public function getAll()
-    {
-        return $this->getArrayCopy();
-    }
-
-    /**
-     * Get the an array with all the keys
-     *
-     * @since 0.1.0
-     * @return array
-     */
-    public function getKeys()
-    {
-        return array_keys((array)$this);
-    }
-
-    /**
-     * Get a new config at a specific sub-level.
-     *
-     * @since 0.1.13
-     *
-     * @param string|array $_ List of keys.
-     *
-     * @return ConfigInterface
-     * @throws KeyNotFoundException If an unknown key is requested.
-     */
-    public function getSubConfig($_)
-    {
-        $keys = $this->validateKeys(func_get_args());
-
-        $subConfig = clone $this;
-        $subConfig->reduceToSubKey($keys);
-
-        return $subConfig;
-    }
-
-    /**
-     * Validate a set of keys to make sure they exist.
-     *
-     * @since 0.1.13
-     *
-     * @param string|array $_ List of keys.
-     *
-     * @return array List of keys.
-     * @throws KeyNotFoundException If an unknown key is requested.
-     */
-    public function validateKeys($_)
-    {
-        $keys = $this->getKeyArguments(func_get_args());
-
-        if (! $this->hasKey($keys)) {
-            throw new KeyNotFoundException(
-                sprintf(
-                    _('The configuration key %1$s does not exist.'),
-                    implode('->', $keys)
-                )
-            );
-        }
-
-        return $keys;
-    }
-
-    /**
-     * Reduce the currently stored config array to a subarray at a specific level.
-     *
-     * @since 0.1.13
-     *
-     * @param array $keys Array of keys that point to a key down in the hierarchy.
-     */
-    protected function reduceToSubKey(array $keys)
-    {
-        $this->exchangeArray($this->getKey($keys));
-    }
-
-    /**
-     * Recursively extract the configuration key arguments from an arbitrary array.
-     *
-     * @since 0.1.6
-     *
-     * @param array $arguments Array as fetched through get_func_args().
-     *
-     * @return array Array of strings.
-     */
-    protected function getKeyArguments($arguments)
-    {
-        $keys = [];
-        foreach ($arguments as $argument) {
-            if (is_array($argument)) {
-                $keys = array_merge($keys, $this->getKeyArguments($argument));
-            }
-            if (is_string($argument)) {
-                $keys = array_merge($keys, $this->parseKeysString($argument));
-            }
-        }
-
-        return $keys;
-    }
-
-    /**
-     * Extract individual keys from a delimited string.
-     *
-     * @since 0.1.6
-     *
-     * @param string $keyString Delimited string of keys.
-     *
-     * @return array Array of key strings.
-     */
-    protected function parseKeysString($keyString)
-    {
-        // Replace all of the configured delimiters by the first one, so that we can then use explode().
-        $normalizedString = str_replace($this->delimiter, $this->delimiter[0], $keyString);
-
-        return (array)explode($this->delimiter[0], $normalizedString);
-    }
-
-    /**
-     * Validate the Config file.
-     *
-     * @since  0.1.0
-     * @return boolean
-     */
-    abstract public function isValid();
+	/**
+	 * Array of strings that are used as delimiters to parse configuration keys.
+	 *
+	 * @since 0.1.6
+	 *
+	 * @var array
+	 */
+	protected $delimiter = ['\\', '/', '.'];
+
+	/**
+	 * Instantiate the AbstractConfig object.
+	 *
+	 * @since 0.1.0
+	 * @since 0.1.6 Accepts a delimiter to parse configuration keys.
+	 *
+	 * @param array                $config    Array with settings.
+	 * @param string[]|string|null $delimiter A string or array of strings that are used as delimiters to parse
+	 *                                        configuration keys. Defaults to "\", "/" & ".".
+	 */
+	public function __construct(array $config, $delimiter = null)
+	{
+		// Make sure the config entries can be accessed as properties.
+		parent::__construct($config, ArrayObject::ARRAY_AS_PROPS);
+
+		if (null !== $delimiter) {
+			$this->delimiter = (array)$delimiter;
+		}
+	}
+
+	/**
+	 * Get the value of a specific key.
+	 *
+	 * To get a value several levels deep, add the keys for each level as a comma-separated list.
+	 *
+	 * @since 0.1.0
+	 * @since 0.1.4 Accepts list of keys.
+	 *
+	 * @param string|array $_ List of keys.
+	 *
+	 * @return mixed
+	 * @throws KeyNotFoundException If an unknown key is requested.
+	 */
+	public function getKey($_)
+	{
+		$keys = $this->validateKeys(func_get_args());
+
+		$keys  = array_reverse($keys);
+		$array = $this->getArrayCopy();
+		while (count($keys) > 0) {
+			$key   = array_pop($keys);
+			$array = $array[$key];
+		}
+
+		return $array;
+	}
+
+	/**
+	 * Check whether the Config has a specific key.
+	 *
+	 * To check a value several levels deep, add the keys for each level as a comma-separated list.
+	 *
+	 * @since 0.1.0
+	 * @since 0.1.4 Accepts list of keys.
+	 *
+	 * @param string|array $_ List of keys.
+	 *
+	 * @return bool
+	 */
+	public function hasKey($_)
+	{
+		try {
+			$keys = array_reverse($this->getKeyArguments(func_get_args()));
+
+			$array = $this->getArrayCopy();
+			while (count($keys) > 0) {
+				$key = array_pop($keys);
+				if (! array_key_exists($key, $array)) {
+					return false;
+				}
+				$array = $array[$key];
+			}
+		} catch (Exception $exception) {
+			return false;
+		}
+
+		return true;
+	}
+
+	/**
+	 * Get a (multi-dimensional) array of all the configuration settings.
+	 *
+	 * @since 0.1.4
+	 *
+	 * @return array
+	 */
+	public function getAll()
+	{
+		return $this->getArrayCopy();
+	}
+
+	/**
+	 * Get the an array with all the keys
+	 *
+	 * @since 0.1.0
+	 * @return array
+	 */
+	public function getKeys()
+	{
+		return array_keys((array)$this);
+	}
+
+	/**
+	 * Get a new config at a specific sub-level.
+	 *
+	 * @since 0.1.13
+	 *
+	 * @param string|array $_ List of keys.
+	 *
+	 * @return ConfigInterface
+	 * @throws KeyNotFoundException If an unknown key is requested.
+	 */
+	public function getSubConfig($_)
+	{
+		$keys = $this->validateKeys(func_get_args());
+
+		$subConfig = clone $this;
+		$subConfig->reduceToSubKey($keys);
+
+		return $subConfig;
+	}
+
+	/**
+	 * Validate a set of keys to make sure they exist.
+	 *
+	 * @since 0.1.13
+	 *
+	 * @param string|array $_ List of keys.
+	 *
+	 * @return array List of keys.
+	 * @throws KeyNotFoundException If an unknown key is requested.
+	 */
+	public function validateKeys($_)
+	{
+		$keys = $this->getKeyArguments(func_get_args());
+
+		if (! $this->hasKey($keys)) {
+			throw new KeyNotFoundException(
+				sprintf(
+					_('The configuration key %1$s does not exist.'),
+					implode('->', $keys)
+				)
+			);
+		}
+
+		return $keys;
+	}
+
+	/**
+	 * Reduce the currently stored config array to a subarray at a specific level.
+	 *
+	 * @since 0.1.13
+	 *
+	 * @param array $keys Array of keys that point to a key down in the hierarchy.
+	 */
+	protected function reduceToSubKey(array $keys)
+	{
+		$this->exchangeArray($this->getKey($keys));
+	}
+
+	/**
+	 * Recursively extract the configuration key arguments from an arbitrary array.
+	 *
+	 * @since 0.1.6
+	 *
+	 * @param array $arguments Array as fetched through get_func_args().
+	 *
+	 * @return array Array of strings.
+	 */
+	protected function getKeyArguments($arguments)
+	{
+		$keys = [];
+		foreach ($arguments as $argument) {
+			if (is_array($argument)) {
+				$keys = array_merge($keys, $this->getKeyArguments($argument));
+			}
+			if (is_string($argument)) {
+				$keys = array_merge($keys, $this->parseKeysString($argument));
+			}
+		}
+
+		return $keys;
+	}
+
+	/**
+	 * Extract individual keys from a delimited string.
+	 *
+	 * @since 0.1.6
+	 *
+	 * @param string $keyString Delimited string of keys.
+	 *
+	 * @return array Array of key strings.
+	 */
+	protected function parseKeysString($keyString)
+	{
+		// Replace all of the configured delimiters by the first one, so that we can then use explode().
+		$normalizedString = str_replace($this->delimiter, $this->delimiter[0], $keyString);
+
+		return (array)explode($this->delimiter[0], $normalizedString);
+	}
+
+	/**
+	 * Validate the Config file.
+	 *
+	 * @since  0.1.0
+	 * @return boolean
+	 */
+	abstract public function isValid();
 }