Use betterproto wrapper classes, extract to module for testability

betterproto/plugin.py

@@ -6,9 +6,9 @@ import re
 import stringcase
 import sys
 import textwrap
-from collections import defaultdict
-from typing import Dict, List, Optional, Type
+from typing import List
 from betterproto.casing import safe_snake_case
+from betterproto.compile.importing import get_ref_type
 import betterproto
 
 try:
@@ -35,78 +35,6 @@ except ImportError as err:
     raise SystemExit(1)
 
 
-WRAPPER_TYPES: Dict[str, Optional[Type]] = defaultdict(
-    lambda: None,
-    {
-        "google.protobuf.DoubleValue": google_wrappers.DoubleValue,
-        "google.protobuf.FloatValue": google_wrappers.FloatValue,
-        "google.protobuf.Int64Value": google_wrappers.Int64Value,
-        "google.protobuf.UInt64Value": google_wrappers.UInt64Value,
-        "google.protobuf.Int32Value": google_wrappers.Int32Value,
-        "google.protobuf.UInt32Value": google_wrappers.UInt32Value,
-        "google.protobuf.BoolValue": google_wrappers.BoolValue,
-        "google.protobuf.StringValue": google_wrappers.StringValue,
-        "google.protobuf.BytesValue": google_wrappers.BytesValue,
-    },
-)
-
-
-def get_ref_type(
-    package: str, imports: set, type_name: str, unwrap: bool = True
-) -> str:
-    """
-    Return a Python type name for a proto type reference. Adds the import if
-    necessary. Unwraps well known type if required.
-    """
-    # If the package name is a blank string, then this should still work
-    # because by convention packages are lowercase and message/enum types are
-    # pascal-cased. May require refactoring in the future.
-    type_name = type_name.lstrip(".")
-
-    # Check if type is wrapper.
-    wrapper_class = WRAPPER_TYPES[type_name]
-
-    if unwrap:
-        if wrapper_class:
-            wrapped_type = type(wrapper_class().value)
-            return f"Optional[{wrapped_type.__name__}]"
-
-        if type_name == "google.protobuf.Duration":
-            return "timedelta"
-
-        if type_name == "google.protobuf.Timestamp":
-            return "datetime"
-    elif wrapper_class:
-        imports.add(f"from {wrapper_class.__module__} import {wrapper_class.__name__}")
-        return f"{wrapper_class.__name__}"
-
-    if type_name.startswith(package):
-        parts = type_name.lstrip(package).lstrip(".").split(".")
-        if len(parts) == 1 or (len(parts) > 1 and parts[0][0] == parts[0][0].upper()):
-            # This is the current package, which has nested types flattened.
-            # foo.bar_thing => FooBarThing
-            cased = [stringcase.pascalcase(part) for part in parts]
-            type_name = f'"{"".join(cased)}"'
-
-    # Use precompiled classes for google.protobuf.* objects
-    if type_name.startswith("google.protobuf.") and type_name.count(".") == 2:
-        type_name = type_name.rsplit(".", maxsplit=1)[1]
-        import_package = "betterproto.lib.google.protobuf"
-        import_alias = safe_snake_case(import_package)
-        imports.add(f"import {import_package} as {import_alias}")
-        return f"{import_alias}.{type_name}"
-
-    if "." in type_name:
-        # This is imported from another package. No need
-        # to use a forward ref and we need to add the import.
-        parts = type_name.split(".")
-        parts[-1] = stringcase.pascalcase(parts[-1])
-        imports.add(f"from .{'.'.join(parts[:-2])} import {parts[-2]}")
-        type_name = f"{parts[-2]}.{parts[-1]}"
-
-    return type_name
-
-
 def py_type(
     package: str,
     imports: set,