Update to drupal 8.0.0-rc1. For more information, see https://www.drupal.org/node/2582663

vendor/masterminds/html5/test/HTML5/Parser/EventStack.php

@@ -0,0 +1,116 @@
+<?php
+namespace Masterminds\HTML5\Tests\Parser;
+
+use Masterminds\HTML5\Elements;
+use Masterminds\HTML5\Parser\EventHandler;
+
+/**
+ * This testing class gathers events from a parser and builds a stack of events.
+ * It is useful for checking the output of a tokenizer.
+ *
+ * IMPORTANT:
+ *
+ * The startTag event also kicks the parser into TEXT_RAW when it encounters
+ * script or pre tags. This is to match the behavior required by the HTML5 spec,
+ * which says that the tree builder must tell the tokenizer when to switch states.
+ */
+class EventStack implements EventHandler
+{
+
+    protected $stack;
+
+    public function __construct()
+    {
+        $this->stack = array();
+    }
+
+    /**
+     * Get the event stack.
+     */
+    public function events()
+    {
+        return $this->stack;
+    }
+
+    public function depth()
+    {
+        return count($this->stack);
+    }
+
+    public function get($index)
+    {
+        return $this->stack[$index];
+    }
+
+    protected function store($event, $data = null)
+    {
+        $this->stack[] = array(
+            'name' => $event,
+            'data' => $data
+        );
+    }
+
+    public function doctype($name, $type = 0, $id = null, $quirks = false)
+    {
+        $args = array(
+            $name,
+            $type,
+            $id,
+            $quirks
+        );
+        $this->store('doctype', $args);
+    }
+
+    public function startTag($name, $attributes = array(), $selfClosing = false)
+    {
+        $args = func_get_args();
+        $this->store('startTag', $args);
+        if ($name == 'pre' || $name == 'script') {
+            return Elements::TEXT_RAW;
+        }
+    }
+
+    public function endTag($name)
+    {
+        $this->store('endTag', array(
+            $name
+        ));
+    }
+
+    public function comment($cdata)
+    {
+        $this->store('comment', array(
+            $cdata
+        ));
+    }
+
+    public function cdata($data)
+    {
+        $this->store('cdata', func_get_args());
+    }
+
+    public function text($cdata)
+    {
+        // fprintf(STDOUT, "Received TEXT event with: " . $cdata);
+        $this->store('text', array(
+            $cdata
+        ));
+    }
+
+    public function eof()
+    {
+        $this->store('eof');
+    }
+
+    public function parseError($msg, $line, $col)
+    {
+        // throw new EventStackParseError(sprintf("%s (line %d, col %d)", $msg, $line, $col));
+        // $this->store(sprintf("%s (line %d, col %d)", $msg, $line, $col));
+        $this->store('error', func_get_args());
+    }
+
+    public function processingInstruction($name, $data = null)
+    {
+        $this->store('pi', func_get_args());
+    }
+}