Basic functionality

src/Config.php

@@ -15,6 +15,18 @@ public function __construct(
 		$this->delimeter = $delimeter;
 	}
 
+	public function setDefault(
+		string $defaultDirectoryPath,
+		string $filename = "config.default.ini"
+	):void {
+		$defaults = $this->loadIni(
+			$defaultDirectoryPath,
+			$filename
+		);
+
+		$this->kvp = array_merge($defaults, $this->kvp);
+	}
+
 	public function get(string $name):?string {
 		$env = getenv($name);
 		if($env) {
@@ -24,6 +36,14 @@ public function get(string $name):?string {
 		return $this->getSectionValue($name);
 	}
 
+	public function getSection(string $sectionName):?ConfigSection {
+		if(!isset($this->kvp[$sectionName])) {
+			return null;
+		}
+
+		return new ConfigSection($this->kvp[$sectionName]);
+	}
+
 	protected function getSectionValue(string $name):?string {
 		$parts = explode($this->delimeter, $name);
 		$current = $this->kvp;
@@ -42,10 +62,10 @@ protected function getSectionValue(string $name):?string {
 		return $current;
 	}
 
-	protected function loadIni(string $projectRoot, string $filename):array {
+	protected function loadIni(string $directoryPath, string $filename):array {
 		$kvp = [];
 
-		$iniPath = $projectRoot . DIRECTORY_SEPARATOR . $filename;
+		$iniPath = $directoryPath . DIRECTORY_SEPARATOR . $filename;
 
 		if(is_file($iniPath)) {
 			$kvp = parse_ini_file($iniPath, true);

src/ConfigSection.php

@@ -0,0 +1,88 @@
+<?php
+namespace Gt\Config;
+
+use ArrayAccess;
+use Iterator;
+
+class ConfigSection implements ArrayAccess, Iterator {
+	protected $data;
+	protected $iteratorIndex;
+
+	public function __construct(array $data) {
+		$this->data = $data;
+	}
+
+	/**
+	 * @link http://php.net/manual/en/iterator.current.php
+	 */
+	public function current() {
+		$key = $this->getIteratorKey();
+		return $this->data[$key];
+	}
+
+	/**
+	 * @link http://php.net/manual/en/iterator.next.php
+	 */
+	public function next():void {
+		$this->iteratorIndex++;
+	}
+
+	/**
+	 * @link http://php.net/manual/en/iterator.key.php
+	 */
+	public function key():?string {
+		return $this->getIteratorKey();
+	}
+
+	/**
+	 * @link http://php.net/manual/en/iterator.valid.php
+	 */
+	public function valid():bool {
+		$key = $this->getIteratorKey();
+		return isset($this->data[$key]);
+	}
+
+	/**
+	 * @link http://php.net/manual/en/iterator.rewind.php
+	 */
+	public function rewind():void {
+		$this->iteratorIndex = 0;
+	}
+
+	/**
+	 * @link http://php.net/manual/en/arrayaccess.offsetexists.php
+	 * @param string $offset
+	 */
+	public function offsetExists($offset):bool {
+		return isset($this->data[$offset]);
+	}
+
+	/**
+	 * @link http://php.net/manual/en/arrayaccess.offsetget.php
+	 * @param string $offset
+	 */
+	public function offsetGet($offset):?string {
+		return $this->data[$offset];
+	}
+
+	/**
+	 * @link http://php.net/manual/en/arrayaccess.offsetset.php
+	 */
+	public function offsetSet($offset, $value):void {
+		// TODO: Config should be immutable
+		// TODO: Implement offsetSet() method.
+	}
+
+	/**
+	 * @link http://php.net/manual/en/arrayaccess.offsetunset.php
+	 */
+	public function offsetUnset($offset):void {
+		// TODO: Config should be immutable
+		// TODO: Implement offsetUnset() method.
+	}
+
+	protected function getIteratorKey():?string {
+		$keys = array_keys($this->data);
+		return $keys[$this->iteratorIndex] ?? null;
+	}
+}