1 files changed, 70 insertions, 0 deletions
diff --git a/lib/spack/external/archspec/cpu/schema.py b/lib/spack/external/archspec/cpu/schema.py
new file mode 100644
index 0000000000..4a9299271b
--- /dev/null
+++ b/lib/spack/external/archspec/cpu/schema.py
@@ -0,0 +1,70 @@
+# Copyright 2019-2020 Lawrence Livermore National Security, LLC and other
+# Archspec Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+"""Global objects with the content of the microarchitecture
+JSON file and its schema
+"""
+import json
+import os.path
+
+try:
+    from collections.abc import MutableMapping  # novm
+except ImportError:
+    from collections import MutableMapping
+
+
+class LazyDictionary(MutableMapping):
+    """Lazy dictionary that gets constructed on first access to any object key
+
+    Args:
+        factory (callable): factory function to construct the dictionary
+    """
+
+    def __init__(self, factory, *args, **kwargs):
+        self.factory = factory
+        self.args = args
+        self.kwargs = kwargs
+        self._data = None
+
+    @property
+    def data(self):
+        """Returns the lazily constructed dictionary"""
+        if self._data is None:
+            self._data = self.factory(*self.args, **self.kwargs)
+        return self._data
+
+    def __getitem__(self, key):
+        return self.data[key]
+
+    def __setitem__(self, key, value):
+        self.data[key] = value
+
+    def __delitem__(self, key):
+        del self.data[key]
+
+    def __iter__(self):
+        return iter(self.data)
+
+    def __len__(self):
+        return len(self.data)
+
+
+def _load_json_file(json_file):
+    json_dir = os.path.join(os.path.dirname(__file__), "..", "json", "cpu")
+    json_dir = os.path.abspath(json_dir)
+
+    def _factory():
+        filename = os.path.join(json_dir, json_file)
+        with open(filename, "r") as file:
+            return json.load(file)
+
+    return _factory
+
+
+#: In memory representation of the data in microarchitectures.json,
+#: loaded on first access
+TARGETS_JSON = LazyDictionary(_load_json_file("microarchitectures.json"))
+
+#: JSON schema for microarchitectures.json, loaded on first access
+SCHEMA = LazyDictionary(_load_json_file("microarchitectures_schema.json"))