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"""The purpose of this module is implement PEP 621 validations that are
difficult to express as a JSON Schema (or that are not supported by the current
JSON Schema library).
"""
from typing import Mapping, TypeVar
from .error_reporting import ValidationError
T = TypeVar("T", bound=Mapping)
class RedefiningStaticFieldAsDynamic(ValidationError):
"""According to PEP 621:
Build back-ends MUST raise an error if the metadata specifies a field
statically as well as being listed in dynamic.
"""
def validate_project_dynamic(pyproject: T) -> T:
project_table = pyproject.get("project", {})
dynamic = project_table.get("dynamic", [])
for field in dynamic:
if field in project_table:
msg = f"You cannot provide a value for `project.{field}` and "
msg += "list it under `project.dynamic` at the same time"
name = f"data.project.{field}"
value = {field: project_table[field], "...": " # ...", "dynamic": dynamic}
raise RedefiningStaticFieldAsDynamic(msg, value, name, rule="PEP 621")
return pyproject
EXTRA_VALIDATIONS = (validate_project_dynamic,)
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