Use standard library tomllib in Python >=3.11

pyproject.toml

@@ -22,7 +22,11 @@ classifiers = [
     "Operating System :: Microsoft :: Windows",
     "Operating System :: MacOS",
 ]
-dependencies = ["distlib~=0.3.5", "flit~=3.7"]
+dependencies = [
+    "distlib~=0.3.5",
+    "flit~=3.7",
+    "tomli~=1.1.0; python_version < '3.11'",
+]
 dynamic = ["version", "description"]
 
 [project.urls]
@@ -34,4 +38,4 @@ Tracker = "https://github.com/tttapa/py-build-cmake/issues"
 name = "py_build_cmake"
 
 [tool.pytest.ini_options]
-testpaths = ["test"]
+testpaths = ["test"]

src/py_build_cmake/config.py

@@ -1,7 +1,6 @@
 from dataclasses import dataclass, field
 import re
 import warnings
-import tomli
 from typing import Any, Dict, List, Optional, Set
 from pathlib import Path
 from flit_core.config import ConfigError, read_pep621_metadata
@@ -11,6 +10,11 @@
 from .config_options import ConfigNode, OverrideConfigOption
 from .pyproject_options import get_options, get_cross_path, get_tool_pbc_path
 
+try:
+    import tomllib as toml_
+except ImportError:
+    import tomli as toml_
+
 
 @dataclass
 class Config:
@@ -31,7 +35,7 @@ def read_metadata(pyproject_path, flag_overrides: Dict[str,
     # Load the pyproject.toml file
     pyproject_path = Path(pyproject_path)
     pyproject_folder = pyproject_path.parent
-    pyproject = tomli.loads(pyproject_path.read_text('utf-8'))
+    pyproject = toml_.loads(pyproject_path.read_text('utf-8'))
     if 'project' not in pyproject:
         raise ConfigError('Missing [project] table')
 
@@ -40,7 +44,7 @@ def read_metadata(pyproject_path, flag_overrides: Dict[str,
     localconfig_path = pyproject_folder / localconfig_fname
     localconfig = None
     if localconfig_path.exists():
-        localconfig = tomli.loads(localconfig_path.read_text('utf-8'))
+        localconfig = toml_.loads(localconfig_path.read_text('utf-8'))
         # treat empty local override as no local override
         localconfig = localconfig or None
 
@@ -49,7 +53,7 @@ def read_metadata(pyproject_path, flag_overrides: Dict[str,
     crossconfig_path = pyproject_folder / crossconfig_fname
     crossconfig = None
     if crossconfig_path.exists():
-        crossconfig = tomli.loads(crossconfig_path.read_text('utf-8'))
+        crossconfig = toml_.loads(crossconfig_path.read_text('utf-8'))
         crossconfig = crossconfig or None
 
     # File names mapping to the actual dict with the config
@@ -64,7 +68,7 @@ def read_metadata(pyproject_path, flag_overrides: Dict[str,
     def try_load_local(path: Path):
         if not path.exists():
             raise FileNotFoundError(path.absolute())
-        return tomli.loads(path.read_text('utf-8'))
+        return toml_.loads(path.read_text('utf-8'))
 
     extra_flag_paths = {
         '--local': get_tool_pbc_path(),