transpile <xsl:attribute name>

src/Xsl/Node/AttributeName.php

@@ -0,0 +1,47 @@
+<?php
+declare(strict_types=1);
+
+namespace Genkgo\Xsl\Xsl\Node;
+
+use DOMElement;
+use Genkgo\Xsl\Xpath\Compiler;
+use Genkgo\Xsl\Xsl\ElementTransformerInterface;
+
+final class AttributeName implements ElementTransformerInterface
+{
+    /**
+     * @var Compiler
+     */
+    private $xpathCompiler;
+
+    /**
+     * @param Compiler $compiler
+     */
+    public function __construct(Compiler $compiler)
+    {
+        $this->xpathCompiler = $compiler;
+    }
+
+    /**
+     * @param DOMElement $element
+     * @return bool
+     */
+    public function supports(DOMElement $element): bool
+    {
+        return $element->hasAttribute('name');
+    }
+
+    /**
+     * @param DOMElement $element
+     */
+    public function transform(DOMElement $element): void
+    {
+        $element->setAttribute(
+            'name',
+            $this->xpathCompiler->compile(
+                $element->getAttribute('name'),
+                $element
+            )
+        );
+    }
+}

src/Xsl/Transformer.php

@@ -13,6 +13,7 @@
 use Genkgo\Xsl\Util\FetchNamespacesFromNode;
 use Genkgo\Xsl\Xpath\Compiler;
 use Genkgo\Xsl\Xsl\Node\AttributeExpandText;
+use Genkgo\Xsl\Xsl\Node\AttributeName;
 use Genkgo\Xsl\Xsl\Node\AttributeValueTemplates;
 use Genkgo\Xsl\Xsl\Node\AttributeMatch;
 use Genkgo\Xsl\Xsl\Node\AttributeSelect;
@@ -147,6 +148,7 @@ public static function newDefaultTransformer(
             new AttributeExpandText($xpathCompiler),
             new AttributeMatch($xpathCompiler),
             new AttributeSelect($xpathCompiler),
+            new AttributeName($xpathCompiler),
             new AttributeTest($xpathCompiler),
             new ElementValueOf(),
             new ElementAttribute(),

test/Stubs/Xsl/ElementAttribute/attribute.xsl

@@ -5,7 +5,7 @@
     <xsl:template match="collection">
         <xsl:for-each select="cd">
             <cd>
-                <xsl:attribute name="attr" select="instrument" />
+                <xsl:attribute name="{lower-case('ATTR')}" select="instrument" />
             </cd>
         </xsl:for-each>
     </xsl:template>