return SourcePosition to WDL.Error

WDL/Error.py

@@ -1,12 +1,43 @@
 # pyre-strict
-from typing import List, Optional, Union, Iterable, TypeVar, Generator, Callable, Any, Dict
+from typing import (
+    List,
+    Optional,
+    Union,
+    Iterable,
+    TypeVar,
+    Generator,
+    Callable,
+    Any,
+    Dict,
+    NamedTuple,
+)
 from functools import total_ordering
 from contextlib import contextmanager
 
-from ._error_util import SourcePosition
 from . import Type
 
 
+class SourcePosition(
+    NamedTuple(
+        "SourcePosition",
+        [
+            ("uri", str),
+            ("abspath", str),
+            ("line", int),
+            ("column", int),
+            ("end_line", int),
+            ("end_column", int),
+        ],
+    )
+):
+    """
+    Source position attached to AST nodes and exceptions; NamedTuple of ``uri`` the filename/URI
+    passed to :func:`WDL.load` or a WDL import statement, which may be relative; ``abspath`` the
+    absolute filename/URI; and one-based int positions ``line`` ``end_line`` ``column``
+    ``end_column``
+    """
+
+
 class SyntaxError(Exception):
     """Failure to lex/parse a WDL document"""