From 07bac0bf75aa598e63f68949eabbd621c552466a Mon Sep 17 00:00:00 2001
From: Kevin Chabowski <kevin@kch42.de>
Date: Mon, 2 Jul 2012 22:19:28 +0200
Subject: set:array_filter added

---
 docu/language_definition.html |  8 +++++++
 stupid_template_engine.php    | 51 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 59 insertions(+)

diff --git a/docu/language_definition.html b/docu/language_definition.html
index 4cf4aaf..e311907 100644
--- a/docu/language_definition.html
+++ b/docu/language_definition.html
@@ -517,5 +517,13 @@
 		<h3 id="stdlib_array_add">ste:array_add</h3>
 			<p>Adding an element to an array. The <code>array</code> parameter takes the variable name of the array. The <code>key</code> parameter takes the array key to map the value to, if omitted, the value will be appended to the end of the array. The value is the tag's content.</p>
 		
+		<h3 id="stdlib_array_filter">ste:array_filter</h3>
+			<p>Filter out array elements by multiple criterias.</p>
+			<p>All the parameters are names of array variables.</p>
+			<p><code>array</code> – The array to filter.</p>
+			<p><code>keep_by_keys</code> – Keep elements with the keys in this array.</p>
+			<p><code>keep_by_values</code> – Keep elements with the values in this array.</p>
+			<p><code>delete_by_keys</code> – Delete elements with the keys in this array.</p>
+			<p><code>delete_by_values</code> – Delete elements with the values in this array.</p>
 </body>
 </html>
diff --git a/stupid_template_engine.php b/stupid_template_engine.php
index e8e78ec..b231e12 100644
--- a/stupid_template_engine.php
+++ b/stupid_template_engine.php
@@ -1434,6 +1434,57 @@ class STEStandardLibrary
 		else
 			$ar[$params["key"]] = $sub($ste);
 	}
+	
+	static public function array_filter($ste, $params, $sub)
+	{
+		if(empty($params["array"]))
+			throw new RuntimeError("Missing array parameter in <ste:array_filter>.");
+		
+		$ar = $ste->get_var_by_name($params["array"]);
+		if(!is_array($ar))
+			throw new RuntimeError("Variable at 'array' is not an array.");
+		
+		$keys = array_keys($ar);
+		
+		if(!empty($params["keep_by_keys"]))
+		{
+			$keep_by_keys = &$ste->get_var_reference($params["keep_by_keys"], False);
+			if(!is_array($keep_by_keys))
+				throw new RuntimeError("Variable at 'keep_by_keys' is not an array.");
+			$delkeys = array_filter($keys, function($k) use ($keep_by_keys) { return !in_array($k, $keep_by_keys); });
+			foreach($delkeys as $dk)
+				unset($ar[$dk]);
+			$keys = array_keys($ar);
+		}
+		if(!empty($params["keep_by_values"]))
+		{
+			$keep_by_values = &$ste->get_var_reference($params["keep_by_values"], False);
+			if(!is_array($keep_by_values))
+				throw new RuntimeError("Variable at 'keep_by_values' is not an array.");
+			$ar = array_filter($ar, function($v) use ($keep_by_values) { return in_array($v, $keep_by_values); });
+			$keys = array_keys($ar);
+		}
+		if(!empty($params["delete_by_keys"]))
+		{
+			$delete_by_keys = &$ste->get_var_reference($params["delete_by_keys"], False);
+			if(!is_array($delete_by_keys))
+				throw new RuntimeError("Variable at 'delete_by_keys' is not an array.");
+			$delkeys = array_filter($keys, function($k) use ($delete_by_keys) { return in_array($k, $delete_by_keys); });
+			foreach($delkeys as $dk)
+				unset($ar[$dk]);
+			$keys = array_keys($ar);
+		}
+		if(!empty($params["delete_by_values"]))
+		{
+			$delete_by_values = &$ste->get_var_reference($params["delete_by_values"], False);
+			if(!is_array($delete_by_values))
+				throw new RuntimeError("Variable at 'delete_by_values' is not an array.");
+			$ar = array_filter($ar, function($v) use ($delete_by_values) { return !in_array($v, $delete_by_values); });
+			$keys = array_keys($ar);
+		}
+		
+		$ste->set_var_by_name($params["array"], $ar);
+	}
 }
 
 ?>
\ No newline at end of file
-- 
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