From a77a2ec58947f5fc7cb4023db3b8f8298e2f01f2 Mon Sep 17 00:00:00 2001
From: Kevin Chabowski <kevin@kch42.de>
Date: Mon, 28 Oct 2013 18:09:50 +0100
Subject: ste:foreach now has an else clause for empty arrays.

---
 docu/language_definition.html |  8 ++++++++
 ste.php                       | 23 ++++++++++++++++++++---
 tests/test_foreach/.gitignore |  3 +++
 tests/test_foreach/code.php   |  9 +++++++++
 tests/test_foreach/test.tpl   |  8 ++++++++
 tests/test_foreach/want       |  5 +++++
 6 files changed, 53 insertions(+), 3 deletions(-)
 create mode 100644 tests/test_foreach/.gitignore
 create mode 100644 tests/test_foreach/code.php
 create mode 100644 tests/test_foreach/test.tpl
 create mode 100644 tests/test_foreach/want

diff --git a/docu/language_definition.html b/docu/language_definition.html
index a21a869..84232de 100644
--- a/docu/language_definition.html
+++ b/docu/language_definition.html
@@ -380,6 +380,14 @@
 <code><pre>&lt;ste:foreach array="foo" key="k" value="v" counter="i"&gt;<br />	Number: $i&lt;br /&gt;<br />	Key: $k&lt;br /&gt;<br />	Value: $v&lt;br /&gt;<br />	&lt;br /&gt;<br />&lt;/ste:foreach&gt;</pre></code>
 				This code will loop through the array <code>foo</code> and return the counter <code>$i</code>, the key <code>$k</code> and the value <code>$v</code> of the current iteration.
 			</p>
+			<p>
+				There can also be an optional <code>&lt;ste:else&gt;</code> clause, that will be executed, if the input array was empty.
+			</p>
+			<p>
+				Example:<br />
+				<code><pre>&lt;ste:foreach array="foo" value="v"&gt;<br />    &lt;p&gt;$v&lt;/p&gt;<br />    &lt;ste:else&gt;<br />        Array \$foo is empty.<br />    &lt;/ste:else&gt;<br />&lt;/ste:foreach&gt;</pre></code>
+				This code will list all array elements or will display <code>Array $foo is empty</code> if the array <code>$foo</code> is empty.
+			</p>
 		
 		<h3 id="builtin_infloop">ste:infloop</h3>
 			<p>Creates an infinitive loop. You can get out of the loop using the <a href="#builtin_break">ste:break</a> tag. Can be used to emulate other loop constructs like while loops.</p>
diff --git a/ste.php b/ste.php
index 3715435..018d754 100644
--- a/ste.php
+++ b/ste.php
@@ -887,14 +887,29 @@ $ste_builtins = array(
 			$loopbody .= "\$${loopname}_counter++;\n\$ste->set_var_by_name(\$${loopname}_countervar, \$${loopname}_counter);\n";
 		}
 		
+		$loop = array();
+		$else = array();
+		foreach($ast->sub as $node) {
+			if(($node instanceof TagNode) && ($node->name == "else")) {
+				$else = array_merge($else, $node->sub);
+			} else {
+				$loop[] = $node;
+			}
+		}
+		
 		$loopbody .= "\$ste->set_var_by_name(\$${loopname}_valuevar, \$${loopname}_value);\n";
 		if(!empty($ast->params["key"])) {
 			$loopbody .= "\$ste->set_var_by_name(\$${loopname}_keyvar, \$${loopname}_key);\n";
 		}
 		$loopbody .= "\n";
-		$loopbody .= _transcompile($ast->sub);
+		$loopbody .= _transcompile($loop);
 		$loopbody = "{\n" . loopbody(indent_code($loopbody)) . "\n}\n";
 		
+		if(!empty($else)) {
+			$code .= "if(empty(\$${loopname}_array))\n{\n";
+			$code .= indent_code(_transcompile($else));
+			$code .= "\n}\nelse ";
+		}
 		$code .= "foreach(\$${loopname}_array as \$${loopname}_key => \$${loopname}_value)\n$loopbody\n";
 		
 		return $code;
@@ -1351,13 +1366,15 @@ class STECore {
 	}
 	
 	private function &_get_var_reference(&$from, $name, $create_if_not_exist) {
+		$nullref = NULL;
+		
 		$bracket_open = strpos($name, "[");
 		if($bracket_open === false) {
 			if(isset($from[$name]) or $create_if_not_exist) {
 				$ref = &$from[$name];
 				return $ref;
 			} else {
-				return NULL;
+				return $nullref;
 			}
 		} else {
 			$old_varname = $varname;
@@ -1371,7 +1388,7 @@ class STECore {
 				if($create_if_not_exist) {
 					$from[$varname] = array();
 				} else {
-					return NULL;
+					return $nullref;
 				}
 			}
 			try {
diff --git a/tests/test_foreach/.gitignore b/tests/test_foreach/.gitignore
new file mode 100644
index 0000000..de2a41b
--- /dev/null
+++ b/tests/test_foreach/.gitignore
@@ -0,0 +1,3 @@
+have
+*.ast
+*.transc.php
diff --git a/tests/test_foreach/code.php b/tests/test_foreach/code.php
new file mode 100644
index 0000000..380ee69
--- /dev/null
+++ b/tests/test_foreach/code.php
@@ -0,0 +1,9 @@
+<?php
+
+function test_func($ste) {
+	$ste->vars["foo"] = array(
+		"a" => array("a" => 100, "b" => 200),
+		"b" => array("a" => 1, "b" => 2),
+		"c" => array("a" => 42, "b" => 1337)
+	);
+}
diff --git a/tests/test_foreach/test.tpl b/tests/test_foreach/test.tpl
new file mode 100644
index 0000000..1aec8b4
--- /dev/null
+++ b/tests/test_foreach/test.tpl
@@ -0,0 +1,8 @@
+<ste:foreach array="foo" key="k" value="v" counter="i">
+	$i: $k -> $v[a], $v[b]
+</ste:foreach>
+---
+<ste:foreach array="bar" value="v">
+	$v
+	<ste:else>--empty--</ste:else>
+</ste:foreach>
diff --git a/tests/test_foreach/want b/tests/test_foreach/want
new file mode 100644
index 0000000..5710bf7
--- /dev/null
+++ b/tests/test_foreach/want
@@ -0,0 +1,5 @@
+0: a -> 100, 200
+1: b -> 1, 2
+2: c -> 42, 1337
+---
+--empty--
-- 
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