1 files changed, 47 insertions, 0 deletions
diff --git a/packages/python/lsprotocol/validators.py b/packages/python/lsprotocol/validators.py
new file mode 100644
index 0000000..a0f00c7
--- /dev/null
+++ b/packages/python/lsprotocol/validators.py
@@ -0,0 +1,47 @@
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License.
+
+
+from typing import TYPE_CHECKING, Any
+
+if TYPE_CHECKING:
+    import attrs
+
+INTEGER_MIN_VALUE = -(2**31)
+INTEGER_MAX_VALUE = 2**31 - 1
+
+
+def integer_validator(
+    instance: Any,
+    attribute: "attrs.Attribute[int]",
+    value: Any,
+) -> bool:
+    """Validates that integer value belongs in the range expected by LSP."""
+    if not isinstance(value, int) or not (
+        INTEGER_MIN_VALUE <= value <= INTEGER_MAX_VALUE
+    ):
+        name = attribute.name if hasattr(attribute, "name") else str(attribute)
+        raise ValueError(
+            f"{instance.__class__.__qualname__}.{name} should be in range [{INTEGER_MIN_VALUE}:{INTEGER_MAX_VALUE}], but was {value}."
+        )
+    return True
+
+
+UINTEGER_MIN_VALUE = 0
+UINTEGER_MAX_VALUE = 2**31 - 1
+
+
+def uinteger_validator(
+    instance: Any,
+    attribute: "attrs.Attribute[int]",
+    value: Any,
+) -> bool:
+    """Validates that unsigned integer value belongs in the range expected by LSP."""
+    if not isinstance(value, int) or not (
+        UINTEGER_MIN_VALUE <= value <= UINTEGER_MAX_VALUE
+    ):
+        name = attribute.name if hasattr(attribute, "name") else str(attribute)
+        raise ValueError(
+            f"{instance.__class__.__qualname__}.{name} should be in range [{UINTEGER_MIN_VALUE}:{UINTEGER_MAX_VALUE}], but was {value}."
+        )
+    return True