[RFC] Add a way to opt-in ext/dom spec compliance (#13031)

RFC: https://wiki.php.net/rfc/opt_in_dom_spec_compliance

NEWS

@@ -36,6 +36,7 @@ PHP                                                                        NEWS
   . Handle OOM more consistently. (nielsdos)
   . Implemented "Improve callbacks in ext/dom and ext/xsl" RFC. (nielsdos)
   . Added DOMXPath::quote() static method. (divinity76)
+  . Implemented opt-in ext/dom spec compliance RFC. (nielsdos)
 
 - Fileinfo:
   . Update to libmagic 5.45. (nielsdos)

UPGRADING

@@ -186,14 +186,6 @@ PHP 8.4 UPGRADE NOTES
   . Added constant DOMNode::DOCUMENT_POSITION_CONTAINS.
   . Added constant DOMNode::DOCUMENT_POSITION_CONTAINED_BY.
   . Added constant DOMNode::DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC.
-  . Implemented DOM HTML5 parsing and serialization.
-    RFC: https://wiki.php.net/rfc/domdocument_html5_parser.
-    This RFC adds the new DOM namespace along with class and constant aliases.
-    There are two new classes to handle HTML and XML documents:
-    DOM\HTMLDocument and DOM\XMLDocument.
-    These classes provide a cleaner API to handle HTML and XML documents.
-    Furthermore, the DOM\HTMLDocument class implements spec-compliant HTML5
-    parsing and serialization.
   . It is now possible to pass any callable to registerPhpFunctions().
     RFC: https://wiki.php.net/rfc/improve_callbacks_dom_and_xsl
 
@@ -453,6 +445,22 @@ PHP 8.4 UPGRADE NOTES
 7. New Classes and Interfaces
 ========================================
 
+- DOM:
+  . Implemented DOM HTML5 parsing and serialization.
+    RFC: https://wiki.php.net/rfc/domdocument_html5_parser.
+    This RFC adds the new DOM namespace along with new classes and
+    constant aliases.
+    There are two new classes to handle HTML and XML documents:
+    DOM\HTMLDocument and DOM\XMLDocument.
+    These classes provide a cleaner API to handle HTML and XML documents.
+    Furthermore, the DOM\HTMLDocument class implements spec-compliant HTML5
+    parsing and serialization.
+  . Implemented opt-in ext/dom spec compliance RFC.
+    This adds new classes in the DOM namespace that correspond to modern
+    equivalents to the old DOM classes in the global namespaces.
+    The new classes follow the DOM living spec.
+    RFC: https://wiki.php.net/rfc/opt_in_dom_spec_compliance
+
 ========================================
 8. Removed Extensions and SAPIs
 ========================================

UPGRADING.INTERNALS

@@ -143,6 +143,7 @@ PHP 8.4 INTERNALS UPGRADE NOTES
    - The macros DOM_NO_ARGS() and DOM_NOT_IMPLEMENTED() have been removed.
    - New public APIs are available to handle callbacks from XPath, see
      xpath_callbacks.h.
+   - Added public APIs to manipulate namespace data, see namespace_compat.h.
 
  b. ext/random
    - The macro RAND_RANGE_BADSCALING() has been removed. The implementation
@@ -176,6 +177,8 @@ PHP 8.4 INTERNALS UPGRADE NOTES
    - Added php_libxml_pretend_ctx_error_ex() to emit errors as if they had come
      from libxml.
    - Removed the "properties" HashTable field from php_libxml_node_object.
+   - Added a way to attached private data to a php_libxml_ref_obj.
+   - Added a way to fix a class type onto php_libxml_ref_obj.
 
  e. ext/date
    - Added the php_format_date_ex() API to format instances of php_date_obj.

ext/dom/attr.c

@@ -72,20 +72,24 @@ PHP_METHOD(DOMAttr, __construct)
 /* {{{ name	string
 readonly=yes
 URL: http://www.w3.org/TR/2003/WD-DOM-Level-3-Core-20030226/DOM3-Core.html#ID-1112119403
+Modern spec URL: https://dom.spec.whatwg.org/#dom-attr-name
 Since:
 */
 zend_result dom_attr_name_read(dom_object *obj, zval *retval)
 {
-	xmlAttrPtr attrp;
-
-	attrp = (xmlAttrPtr) dom_object_get_node(obj);
+	xmlAttrPtr attrp = (xmlAttrPtr) dom_object_get_node(obj);
 
 	if (attrp == NULL) {
 		php_dom_throw_error(INVALID_STATE_ERR, 1);
 		return FAILURE;
 	}
 
-	ZVAL_STRING(retval, (char *) attrp->name);
+	if (php_dom_follow_spec_intern(obj)) {
+		zend_string *str = dom_node_get_node_name_attribute_or_element((xmlNodePtr) attrp, false);
+		ZVAL_NEW_STR(retval, str);
+	} else {
+		ZVAL_STRING(retval, (char *) attrp->name);
+	}
 
 	return SUCCESS;
 }
@@ -99,7 +103,7 @@ URL: http://www.w3.org/TR/2003/WD-DOM-Level-3-Core-20030226/DOM3-Core.html#ID-86
 */
 zend_result dom_attr_specified_read(dom_object *obj, zval *retval)
 {
-	/* TODO */
+	/* From spec: "useless; always returns true" */
 	ZVAL_TRUE(retval);
 	return SUCCESS;
 }
@@ -147,7 +151,13 @@ zend_result dom_attr_value_write(dom_object *obj, zval *newval)
 	zend_string *str = Z_STR_P(newval);
 
 	dom_remove_all_children((xmlNodePtr) attrp);
-	xmlNodeSetContentLen((xmlNodePtr) attrp, (xmlChar *) ZSTR_VAL(str), ZSTR_LEN(str));
+
+	if (php_dom_follow_spec_intern(obj)) {
+		xmlNodePtr node = xmlNewDocTextLen(attrp->doc, BAD_CAST ZSTR_VAL(str), ZSTR_LEN(str));
+		xmlAddChild((xmlNodePtr) attrp, node);
+	} else {
+		xmlNodeSetContentLen((xmlNodePtr) attrp, BAD_CAST ZSTR_VAL(str), ZSTR_LEN(str));
+	}
 
 	return SUCCESS;
 }