build: switch to tomli for TOML v1 compliant parser

Fixes pypa#308

Signed-off-by: Filipe Laíns <[email protected]>

Author: FFY00

CHANGELOG.rst

@@ -9,6 +9,7 @@ Unreleased
 - Improved output (`PR #333`_, Fixes `#142`_)
 - The CLI now honnors `NO_COLOR`_ (`PR #333`_)
 - Added logging to ``build`` and ``build.env`` (`PR #333`_)
+- Switch to a TOML v1 compliant parser (`PR #334`_, Fixes `#308`_)
 
 
 Breaking Changes
@@ -17,7 +18,9 @@ Breaking Changes
 - Dropped support for Python 2 and 3.5.
 
 .. _PR #333: https://github.com/pypa/build/pull/333
+.. _PR #334: https://github.com/pypa/build/pull/334
 .. _#142: https://github.com/pypa/build/issues/142
+.. _#308: https://github.com/pypa/build/issues/308
 .. _NO_COLOR: https://no-color.org
 
 

setup.cfg

@@ -27,7 +27,7 @@ packages = find:
 install_requires =
     packaging>=19.0
     pep517>=0.9.1
-    toml>=0.10.0
+    tomli>=1.0.0 # toml can be used instead
     colorama;os_name == "nt" # not actually a runtime dependency, only supplied as there is not "recomended dependency" support
     importlib-metadata>=0.22;python_version < "3.8"
 python_requires = >=3.6

src/build/__init__.py

@@ -20,7 +20,12 @@
 from typing import AbstractSet, Any, Callable, Dict, Iterator, Mapping, Optional, Sequence, Set, Tuple, Type, Union
 
 import pep517.wrappers
-import toml
+
+
+try:
+    import tomli as toml
+except ModuleNotFoundError:
+    import toml  # type: ignore  # pragma: no cover
 
 
 RunnerType = Callable[[Sequence[str], Optional[str], Optional[Mapping[str, str]]], None]