Add support for PEP-621

src/poetry/core/packages/package.py

@@ -103,6 +103,8 @@ def __init__(
         self.keywords: list[str] = []
         self._license: License | None = None
         self._readme: Path | None = None
+        self.readme_content_type: str | None = None
+        self.readme_content: str | None = None
         self.readmes: tuple[Path, ...] = ()
 
         self.extras: dict[NormalizedName, list[Dependency]] = {}

src/poetry/core/pyproject/formats/standard_content_format.py

@@ -0,0 +1,196 @@
+from __future__ import annotations
+
+from typing import TYPE_CHECKING
+
+from packaging.utils import canonicalize_name
+
+from poetry.core.json import validate_object
+from poetry.core.packages.project_package import ProjectPackage
+from poetry.core.pyproject.formats.content_format import ContentFormat
+from poetry.core.pyproject.formats.validation_result import ValidationResult
+from poetry.core.utils.helpers import combine_unicode
+
+
+if TYPE_CHECKING:
+    from pathlib import Path
+    from typing import Any
+
+    from poetry.core.packages.dependency_group import DependencyGroup
+    from poetry.core.spdx.license import License
+
+
+class StandardContentFormat(ContentFormat):
+    @classmethod
+    def supports(cls, content: dict[str, Any]) -> bool:
+        return "project" in content
+
+    def validate(self, strict: bool = False) -> ValidationResult:
+        result = ValidationResult([], [])
+
+        # Schema validation errors
+        validation_errors = validate_object(self._content, "poetry-pep621-schema")
+
+        result.errors += validation_errors
+
+        return result
+
+    def to_package(self, root: Path, with_groups: bool = True) -> ProjectPackage:
+        from poetry.core.packages.dependency import Dependency
+        from poetry.core.packages.dependency_group import MAIN_GROUP
+        from poetry.core.spdx.helpers import license_by_id
+
+        config = self._content["project"]
+
+        package = ProjectPackage(config["name"], config["version"])
+        package.root_dir = root
+
+        if "requires-python" in config:
+            package.python_versions = config["requires-python"]
+
+        for author in config.get("authors", []):
+            name, email = author.get("name"), author.get("email")
+            if name and email:
+                package.authors.append(
+                    f"{combine_unicode(name)} <{combine_unicode(email)}>"
+                )
+            elif name:
+                package.authors.append(combine_unicode(name))
+            else:
+                package.authors.append(combine_unicode(name))
+
+        for maintainer in config.get("maintainers", []):
+            name, email = maintainer.get("name"), maintainer.get("email")
+            if name and email:
+                package.maintainers.append(
+                    f"{combine_unicode(name)} <{combine_unicode(email)}>"
+                )
+            elif name:
+                package.maintainers.append(combine_unicode(name))
+            else:
+                package.maintainers.append(combine_unicode(name))
+
+        package.description = config.get("description")
+
+        if "text" in config.get("license", {}):
+            try:
+                license_: License | None = license_by_id(config["license"]["text"])
+            except ValueError:
+                license_ = None
+        else:
+            license_ = None
+
+        package.license = license_
+        package.keywords = config.get("keywords", [])
+        package.classifiers = config.get("classifiers", [])
+
+        if "readme" in config:
+            readme = config["readme"]
+            if isinstance(readme, str):
+                package.readme = root / readme
+            elif "file" in readme:
+                package.readme = root / readme["file"]
+                package.readme_content_type = readme["content-type"]
+            elif "text" in readme:
+                package.readme_content = root / readme["text"]
+                package.readme_content_type = readme["content-type"]
+
+        if "dependencies" in config:
+            self._add_package_group_dependencies(
+                package, MAIN_GROUP, config["dependencies"], root_dir=root
+            )
+
+        if "optional-dependencies" in config:
+            for extra_name, dependencies in config["optional-dependencies"].items():
+                extra_name = canonicalize_name(extra_name)
+                package.extras[extra_name] = []
+
+                for dependency_constraint in dependencies:
+                    dependency = Dependency.create_from_pep_508(
+                        dependency_constraint, relative_to=root
+                    )
+                    dependency._optional = True
+                    dependency.in_extras.append(extra_name)
+                    package.extras[extra_name].append(dependency)
+
+                    if not package.has_dependency_group(MAIN_GROUP):
+                        group = DependencyGroup(MAIN_GROUP)
+                        package.add_dependency_group(group)
+                    else:
+                        group = package.dependency_group(MAIN_GROUP)
+
+                    group.add_dependency(dependency)
+
+        # Custom urls
+        if "urls" in config:
+            package.custom_urls = config["urls"]
+
+        package.scripts = config.get("scripts", {})
+        package.gui_scripts = config.get("gui-scripts", {})
+        package.entrypoints = config.get("entry-points", {})
+
+        poetry_config = config.get("tool", {}).get("poetry", {})
+
+        if "build" in poetry_config:
+            build = poetry_config["build"]
+            if not isinstance(build, dict):
+                build = {"script": build}
+            package.build_config = build or {}
+
+        if "include" in poetry_config:
+            package.include = []
+
+            for include in poetry_config["include"]:
+                if not isinstance(include, dict):
+                    include = {"path": include}
+
+                formats = include.get("format", [])
+                if formats and not isinstance(formats, list):
+                    formats = [formats]
+                include["format"] = formats
+
+                package.include.append(include)
+
+        if "exclude" in poetry_config:
+            package.exclude = poetry_config["exclude"]
+
+        if "packages" in poetry_config:
+            package.packages = poetry_config["packages"]
+
+        return package
+
+    @property
+    def hash_content(self) -> dict[str, Any]:
+        ...
+
+    @property
+    def poetry_config(self) -> dict[str, Any]:
+        """
+        The custom poetry configuration (i.e. the parts in [tool.poetry] that are not related to the package)
+        """
+        ...
+
+    @classmethod
+    def _add_package_group_dependencies(
+        cls,
+        package: ProjectPackage,
+        group: str | DependencyGroup,
+        dependencies: list[str],
+        root_dir: Path | None = None,
+    ) -> None:
+        from poetry.core.packages.dependency import Dependency
+
+        if isinstance(group, str):
+            if package.has_dependency_group(group):
+                group = package.dependency_group(group)
+            else:
+                from poetry.core.packages.dependency_group import DependencyGroup
+
+                group = DependencyGroup(group)
+
+        for constraint in dependencies:
+            dependency = Dependency.create_from_pep_508(
+                constraint, relative_to=root_dir
+            )
+            group.add_dependency(dependency)
+
+        package.add_dependency_group(group)

src/poetry/core/pyproject/toml.py

@@ -7,6 +7,7 @@
 
 from poetry.core.pyproject.formats.content_format import ContentFormat
 from poetry.core.pyproject.formats.legacy_content_format import LegacyContentFormat
+from poetry.core.pyproject.formats.standard_content_format import StandardContentFormat
 
 
 if TYPE_CHECKING:
@@ -19,7 +20,10 @@
 
 
 class PyProjectTOML:
-    SUPPORTED_FORMATS: list[type[ContentFormat]] = [LegacyContentFormat]
+    SUPPORTED_FORMATS: list[type[ContentFormat]] = [
+        LegacyContentFormat,
+        StandardContentFormat,
+    ]
 
     def __init__(self, path: str | Path) -> None:
         from poetry.core.toml import TOMLFile

tests/fixtures/sample_pep621_project/README.md

@@ -0,0 +1 @@
+# My Package

tests/fixtures/sample_pep621_project/pyproject.toml

@@ -0,0 +1,64 @@
+[project]
+name = "my-package"
+version = "1.2.3"
+description = "Some description."
+readme = "README.md"
+requires-python = ">=3.6"
+license = { text = "MIT" }
+keywords = ["packaging", "dependency", "poetry"]
+authors = [
+    { name = "Sébastien Eustace", email = "sebastien@eustace.io" }
+]
+maintainers = [
+    { name = "Sébastien Eustace", email = "sebastien@eustace.io" }
+]
+
+classifiers = [
+    "Topic :: Software Development :: Build Tools",
+    "Topic :: Software Development :: Libraries :: Python Modules"
+]
+
+# Requirements
+dependencies = [
+    "cleo ~=0.6",
+    "pendulum @ git+https://github.com/sdispater/pendulum.git@2.0",
+    "tomlkit @ git+https://github.com/sdispater/tomlkit.git@3bff550",
+    "pathlib2 ~=2.2 ; python_version == '2.7'",
+    # File dependency
+    "demo @ ../distributions/demo-0.1.0-py2.py3-none-any.whl",
+    # Dir dependency with setup.py
+    "my-package @ ../project_with_setup/",
+    # Dir dependency with pyproject.toml
+    "simple-project @ ../simple_project/",
+    # Dependency with markers
+    "functools32 ~=3.2.3 ; python_version ~= '2.7' and sys_platform == 'win32' or python_version in '3.4 3.5'",
+    # Dependency with python constraint
+    "dataclasses ~=0.7 ; python_full_version >= '3.6.1' and python_version < '3.7'"
+]
+
+[project.optional-dependencies]
+db = [
+    "orator ~=0.9"
+]
+network = [
+    "requests[security] ~=2.18"
+]
+
+[project.urls]
+homepage = "https://python-poetry.org"
+repository = "https://github.com/python-poetry/poetry"
+documentation = "https://python-poetry.org/docs"
+
+[project.scripts]
+my-script = "my_package:main"
+
+[project.entry-points."blogtool.parsers"]
+".rst" = "some_module::SomeClass"
+
+[tool.poetry.dependency-options]
+tomlkit = { develop = true }
+
+[tool.poetry.group.dev]
+dependencies = [
+    "pytest ~=3.4"
+]