1 files changed, 58 insertions, 0 deletions
diff --git a/registry/spec_tools/util.py b/registry/spec_tools/util.py
new file mode 100644
index 0000000..b890679
--- /dev/null
+++ b/registry/spec_tools/util.py
@@ -0,0 +1,58 @@
+"""Utility functions not closely tied to other spec_tools types."""
+# Copyright 2018-2019 Collabora, Ltd.
+# Copyright 2013-2021 The Khronos Group Inc.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+
+def getElemName(elem, default=None):
+    """Get the name associated with an element, either a name child or name attribute."""
+    name_elem = elem.find('name')
+    if name_elem is not None:
+        return name_elem.text
+    # Fallback if there is no child.
+    return elem.get('name', default)
+
+
+def getElemType(elem, default=None):
+    """Get the type associated with an element, either a type child or type attribute."""
+    type_elem = elem.find('type')
+    if type_elem is not None:
+        return type_elem.text
+    # Fallback if there is no child.
+    return elem.get('type', default)
+
+
+def findFirstWithPredicate(collection, pred):
+    """Return the first element that satisfies the predicate, or None if none exist.
+
+    NOTE: Some places where this is used might be better served by changing to a dictionary.
+    """
+    for elt in collection:
+        if pred(elt):
+            return elt
+    return None
+
+
+def findNamedElem(elems, name):
+    """Traverse a collection of elements with 'name' nodes or attributes, looking for and returning one with the right name.
+
+    NOTE: Many places where this is used might be better served by changing to a dictionary.
+    """
+    return findFirstWithPredicate(elems, lambda elem: getElemName(elem) == name)
+
+
+def findTypedElem(elems, typename):
+    """Traverse a collection of elements with 'type' nodes or attributes, looking for and returning one with the right typename.
+
+    NOTE: Many places where this is used might be better served by changing to a dictionary.
+    """
+    return findFirstWithPredicate(elems, lambda elem: getElemType(elem) == typename)
+
+
+def findNamedObject(collection, name):
+    """Traverse a collection of elements with 'name' attributes, looking for and returning one with the right name.
+
+    NOTE: Many places where this is used might be better served by changing to a dictionary.
+    """
+    return findFirstWithPredicate(collection, lambda elt: elt.name == name)