Separate common methods into BaseParser class

common/framework/parsers/baseparser.php

@@ -0,0 +1,60 @@
+<?php
+
+namespace Rhymix\Framework\Parsers;
+
+/**
+ * This class provides common methods for other parser classes to use.
+ */
+abstract class BaseParser
+{
+	/**
+	 * Get all attributes of an element as an associative array.
+	 * 
+	 * @param SimpleXMLElement $element
+	 * @param bool $remove_symbols
+	 * @return array
+	 */
+	protected static function _getAttributes(\SimpleXMLElement $element, $remove_symbols = true): array
+	{
+		$result = array();
+		foreach ($element->attributes() as $key => $val)
+		{
+			if ($remove_symbols)
+			{
+				$key = preg_replace('/[^a-z]/', '', $key);
+			}
+			$result[trim($key)] = trim($val);
+		}
+		return $result;
+	}
+	
+	/**
+	 * Get the contents of child elements that match a language.
+	 * 
+	 * @param SimpleXMLElement $parent
+	 * @param string $tag_name
+	 * @param string $lang
+	 * @return string
+	 */
+	protected static function _getChildrenByLang(\SimpleXMLElement $parent, string $tag_name, string $lang): string
+	{
+		// If there is a child element that matches the language, return it.
+		foreach ($parent->{$tag_name} as $child)
+		{
+			$attribs = $child->attributes('xml', true);
+			if (strval($attribs['lang']) === $lang)
+			{
+				return trim($child);
+			}
+		}
+		
+		// Otherwise, return the first child element.
+		foreach ($parent->{$tag_name} as $child)
+		{
+			return trim($child);
+		}
+		
+		// If there are no child elements, return an empty string.
+		return '';
+	}
+}