Merge pull request pdepend#350 from emirb/yield-from

Add support for "yield from" for PHP >7

src/main/php/PDepend/Source/Language/PHP/PHPTokenizerInternal.php

@@ -363,6 +363,7 @@ class PHPTokenizerInternal implements Tokenizer
         'false'          =>  Tokens::T_FALSE,
         'trait'          =>  Tokens::T_TRAIT,
         'yield'          =>  Tokens::T_YIELD,
+        'yield from'     =>  Tokens::T_YIELD,
         'parent'         =>  Tokens::T_PARENT,
         'finally'        =>  Tokens::T_FINALLY,
         'callable'       =>  Tokens::T_CALLABLE,

src/test/php/PDepend/Source/Language/PHP/PHPParserVersion70Test.php

@@ -523,6 +523,14 @@ public function testClassMethodNamesInvoked()
         $this->assertNotNull($this->parseCodeResourceForTest());
     }
 
+    /**
+     * @return void
+     */
+    public function testYieldFrom()
+    {
+        $this->assertNotNull($this->parseCodeResourceForTest());
+    }
+
     /**
      * Tests that the parser throws an exception when it detects an invalid
      * token in a method or property declaration.

src/test/resources/files/Source/Language/PHP/PHPParserVersion70/testYieldFrom.php

@@ -0,0 +1,11 @@
+<?php
+function gen() {
+    yield from from(); // keys 0-2
+}
+function from() {
+    yield 1; // key 0
+    yield 2; // key 1
+    yield 3; // key 2
+}
+// pass false as second parameter to get an array [0, 1, 2, 3, 4]
+var_dump(iterator_to_array(gen()));