1 files changed, 88 insertions, 0 deletions
diff --git a/src/HTML5/Elements.php b/src/HTML5/Elements.php
index d437960..ad58363 100644
--- a/src/HTML5/Elements.php
+++ b/src/HTML5/Elements.php
@@ -1,6 +1,13 @@
 <?php
 namespace HTML5;
 
+/**
+ * Provide general element functions.
+ *
+ * @todo consider using a bitmask table lookup. There is enought overlap in
+ *   naming that this could significantly shrink the size and maybe make it
+ *   faster. See the Go teams implementation at https://code.google.com/p/go/source/browse/html/atom.
+ */
 class Elements {
 
   const TEXT_RAW = 0x01;
@@ -126,6 +133,56 @@ class Elements {
   );
 
   /**
+   * The MathML elements. See http://www.w3.org/wiki/MathML/Elements.
+   *
+   * In our case we are only concerned with presentation MathML and not content
+   * MathML. There is a nice list of this subset at https://developer.mozilla.org/en-US/docs/MathML/Element.
+   * 
+   * @var array
+   */
+  public static $mathml = array(
+    "maction" => 1,
+    "maligngroup" => 1,
+    "malignmark" => 1,
+    "math" => 1,
+    "menclose" => 1,
+    "merror" => 1,
+    "mfenced" => 1,
+    "mfrac" => 1,
+    "mglyph" => 1,
+    "mi" => 1,
+    "mlabeledtr" => 1,
+    "mlongdiv" => 1,
+    "mmultiscripts" => 1,
+    "mn" => 1,
+    "mo" => 1,
+    "mover" => 1,
+    "mpadded" => 1,
+    "mphantom" => 1,
+    "mroot" => 1,
+    "mrow" => 1,
+    "ms" => 1,
+    "mscarries" => 1,
+    "mscarry" => 1,
+    "msgroup" => 1,
+    "msline" => 1,
+    "mspace" => 1,
+    "msqrt" => 1,
+    "msrow" => 1,
+    "mstack" => 1,
+    "mstyle" => 1,
+    "msub" => 1,
+    "msup" => 1,
+    "msubsup" => 1,
+    "mtable" => 1,
+    "mtd" => 1,
+    "mtext" => 1,
+    "mtr" => 1,
+    "munder" => 1,
+    "munderover" => 1,
+  );
+
+  /**
    * Test if an element is a valid html5 element.
    *
    * @param string $name
@@ -140,4 +197,35 @@ class Elements {
     // Do we need this check or will all data passed here already be lowercase?
     return isset(self::$elements[strtolower($name)]);
   }
+
+  /**
+   * Test if an element name is a valid MathML presentation element.
+   *
+   * @param string $name
+   *   The name of the element.
+   *
+   * @return bool
+   *   True if a MathML name and false otherwise.
+   */
+  public static function isMathMLElement($name) {
+
+    // MathML is case-sensetitive unlike html5 elements.
+    return isset(self::$mathml[$name]);
+  }
+
+  /**
+   * Is an element name valid in an html5 document.
+   *
+   * This includes html5 elements along with other allowed embedded content
+   * such as svg and mathml.
+   * 
+   * @param string $name 
+   *   The name of the element.
+   *
+   * @return bool
+   *   True if valid and false otherwise.
+   */
+  public function isElement($name) {
+    return self::isHtml5Element($name) || self::isMathMLElement($name);
+  }
 }