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# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
"""TOML configuration support for coverage.py"""
from __future__ import annotations
import os
import re
from typing import Any, Callable, Dict, Iterable, List, Optional, Tuple, Type, TypeVar
from coverage import env
from coverage.exceptions import ConfigError
from coverage.misc import import_third_party, substitute_variables
from coverage.types import TConfigSectionOut, TConfigValueOut
if env.PYVERSION >= (3, 11, 0, "alpha", 7):
import tomllib # pylint: disable=import-error
has_tomllib = True
else:
# TOML support on Python 3.10 and below is an install-time extra option.
tomllib, has_tomllib = import_third_party("tomli")
class TomlDecodeError(Exception):
"""An exception class that exists even when toml isn't installed."""
pass
TWant = TypeVar("TWant")
class TomlConfigParser:
"""TOML file reading with the interface of HandyConfigParser."""
# This class has the same interface as config.HandyConfigParser, no
# need for docstrings.
# pylint: disable=missing-function-docstring
def __init__(self, our_file: bool) -> None:
self.our_file = our_file
self.data: Dict[str, Any] = {}
def read(self, filenames: Iterable[str]) -> List[str]:
# RawConfigParser takes a filename or list of filenames, but we only
# ever call this with a single filename.
assert isinstance(filenames, (bytes, str, os.PathLike))
filename = os.fspath(filenames)
try:
with open(filename, encoding='utf-8') as fp:
toml_text = fp.read()
except OSError:
return []
if has_tomllib:
try:
self.data = tomllib.loads(toml_text)
except tomllib.TOMLDecodeError as err:
raise TomlDecodeError(str(err)) from err
return [filename]
else:
has_toml = re.search(r"^\[tool\.coverage(\.|])", toml_text, flags=re.MULTILINE)
if self.our_file or has_toml:
# Looks like they meant to read TOML, but we can't read it.
msg = "Can't read {!r} without TOML support. Install with [toml] extra"
raise ConfigError(msg.format(filename))
return []
def _get_section(self, section: str) -> Tuple[Optional[str], Optional[TConfigSectionOut]]:
"""Get a section from the data.
Arguments:
section (str): A section name, which can be dotted.
Returns:
name (str): the actual name of the section that was found, if any,
or None.
data (str): the dict of data in the section, or None if not found.
"""
prefixes = ["tool.coverage."]
for prefix in prefixes:
real_section = prefix + section
parts = real_section.split(".")
try:
data = self.data[parts[0]]
for part in parts[1:]:
data = data[part]
except KeyError:
continue
break
else:
return None, None
return real_section, data
def _get(self, section: str, option: str) -> Tuple[str, TConfigValueOut]:
"""Like .get, but returns the real section name and the value."""
name, data = self._get_section(section)
if data is None:
raise ConfigError(f"No section: {section!r}")
assert name is not None
try:
value = data[option]
except KeyError:
raise ConfigError(f"No option {option!r} in section: {name!r}") from None
return name, value
def _get_single(self, section: str, option: str) -> Any:
"""Get a single-valued option.
Performs environment substitution if the value is a string. Other types
will be converted later as needed.
"""
name, value = self._get(section, option)
if isinstance(value, str):
value = substitute_variables(value, os.environ)
return name, value
def has_option(self, section: str, option: str) -> bool:
_, data = self._get_section(section)
if data is None:
return False
return option in data
def real_section(self, section: str) -> Optional[str]:
name, _ = self._get_section(section)
return name
def has_section(self, section: str) -> bool:
name, _ = self._get_section(section)
return bool(name)
def options(self, section: str) -> List[str]:
_, data = self._get_section(section)
if data is None:
raise ConfigError(f"No section: {section!r}")
return list(data.keys())
def get_section(self, section: str) -> TConfigSectionOut:
_, data = self._get_section(section)
return data or {}
def get(self, section: str, option: str) -> Any:
_, value = self._get_single(section, option)
return value
def _check_type(
self,
section: str,
option: str,
value: Any,
type_: Type[TWant],
converter: Optional[Callable[[Any], TWant]],
type_desc: str,
) -> TWant:
"""Check that `value` has the type we want, converting if needed.
Returns the resulting value of the desired type.
"""
if isinstance(value, type_):
return value
if isinstance(value, str) and converter is not None:
try:
return converter(value)
except Exception as e:
raise ValueError(
f"Option [{section}]{option} couldn't convert to {type_desc}: {value!r}"
) from e
raise ValueError(
f"Option [{section}]{option} is not {type_desc}: {value!r}"
)
def getboolean(self, section: str, option: str) -> bool:
name, value = self._get_single(section, option)
bool_strings = {"true": True, "false": False}
return self._check_type(name, option, value, bool, bool_strings.__getitem__, "a boolean")
def _get_list(self, section: str, option: str) -> Tuple[str, List[str]]:
"""Get a list of strings, substituting environment variables in the elements."""
name, values = self._get(section, option)
values = self._check_type(name, option, values, list, None, "a list")
values = [substitute_variables(value, os.environ) for value in values]
return name, values
def getlist(self, section: str, option: str) -> List[str]:
_, values = self._get_list(section, option)
return values
def getregexlist(self, section: str, option: str) -> List[str]:
name, values = self._get_list(section, option)
for value in values:
value = value.strip()
try:
re.compile(value)
except re.error as e:
raise ConfigError(f"Invalid [{name}].{option} value {value!r}: {e}") from e
return values
def getint(self, section: str, option: str) -> int:
name, value = self._get_single(section, option)
return self._check_type(name, option, value, int, int, "an integer")
def getfloat(self, section: str, option: str) -> float:
name, value = self._get_single(section, option)
if isinstance(value, int):
value = float(value)
return self._check_type(name, option, value, float, float, "a float")