fix[tool]: keep experimentalCodegen blank in standard json input (v…

…yperlang#4216)

in standard json input, `experimentalCodegen` would default
to true, creating a conflict if the user used `#pragma
experimental-codegen`. set it to `None`.

misc/refactor:
- refactor `get_settings` function.

---------

Co-authored-by: Ramana Kumar <ramana@member.fsf.org>

tests/unit/cli/vyper_json/test_get_settings.py

@@ -1,6 +1,6 @@
 import pytest
 
-from vyper.cli.vyper_json import get_evm_version
+from vyper.cli.vyper_json import get_evm_version, get_settings
 from vyper.exceptions import JSONError
 
 
@@ -30,3 +30,14 @@ def test_early_evm(evm_version_str):
 @pytest.mark.parametrize("evm_version_str", ["london", "paris", "shanghai", "cancun"])
 def test_valid_evm(evm_version_str):
     assert evm_version_str == get_evm_version({"settings": {"evmVersion": evm_version_str}})
+
+
+def test_experimental_codegen_settings():
+    input_json = {"settings": {}}
+    assert get_settings(input_json).experimental_codegen is None
+
+    input_json = {"settings": {"experimentalCodegen": True}}
+    assert get_settings(input_json).experimental_codegen is True
+
+    input_json = {"settings": {"experimentalCodegen": False}}
+    assert get_settings(input_json).experimental_codegen is False

vyper/cli/vyper_json.py

@@ -249,16 +249,11 @@ def get_search_paths(input_dict: dict) -> list[PurePath]:
     return [PurePath(p) for p in ret]
 
 
-def compile_from_input_dict(
-    input_dict: dict, exc_handler: Callable = exc_handler_raises
-) -> tuple[dict, dict]:
-    if input_dict["language"] != "Vyper":
-        raise JSONError(f"Invalid language '{input_dict['language']}' - Only Vyper is supported.")
-
+def get_settings(input_dict: dict) -> Settings:
     evm_version = get_evm_version(input_dict)
 
     optimize = input_dict["settings"].get("optimize")
-    experimental_codegen = input_dict["settings"].get("experimentalCodegen", False)
+    experimental_codegen = input_dict["settings"].get("experimentalCodegen")
     if isinstance(optimize, bool):
         # bool optimization level for backwards compatibility
         warnings.warn(
@@ -271,10 +266,19 @@ def compile_from_input_dict(
     else:
         assert optimize is None
 
-    settings = Settings(
+    return Settings(
         evm_version=evm_version, optimize=optimize, experimental_codegen=experimental_codegen
     )
 
+
+def compile_from_input_dict(
+    input_dict: dict, exc_handler: Callable = exc_handler_raises
+) -> tuple[dict, dict]:
+    if input_dict["language"] != "Vyper":
+        raise JSONError(f"Invalid language '{input_dict['language']}' - Only Vyper is supported.")
+
+    settings = get_settings(input_dict)
+
     no_bytecode_metadata = not input_dict["settings"].get("bytecodeMetadata", True)
 
     integrity = input_dict.get("integrity")