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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
"""
Types for use throughout coverage.py.
"""
from __future__ import annotations
import os
import pathlib
from types import FrameType, ModuleType
from typing import (
Any, Callable, Dict, Iterable, List, Mapping, Optional, Set, Tuple, Type, Union,
TYPE_CHECKING,
)
if TYPE_CHECKING:
# Protocol is new in 3.8. PYVERSIONS
from typing import Protocol
from coverage.plugin import FileTracer
else:
class Protocol: # pylint: disable=missing-class-docstring
pass
## File paths
# For arguments that are file paths:
if TYPE_CHECKING:
FilePath = Union[str, os.PathLike[str]]
else:
# PathLike < python3.9 doesn't support subscription
FilePath = Union[str, os.PathLike]
# For testing FilePath arguments
FilePathClasses = [str, pathlib.Path]
FilePathType = Union[Type[str], Type[pathlib.Path]]
## Python tracing
class TTraceFn(Protocol):
"""A Python trace function."""
def __call__(
self,
frame: FrameType,
event: str,
arg: Any,
lineno: Optional[TLineNo] = None # Our own twist, see collector.py
) -> Optional[TTraceFn]:
...
## Coverage.py tracing
# Line numbers are pervasive enough that they deserve their own type.
TLineNo = int
TArc = Tuple[TLineNo, TLineNo]
class TFileDisposition(Protocol):
"""A simple value type for recording what to do with a file."""
original_filename: str
canonical_filename: str
source_filename: Optional[str]
trace: bool
reason: str
file_tracer: Optional[FileTracer]
has_dynamic_filename: bool
# When collecting data, we use a dictionary with a few possible shapes. The
# keys are always file names.
# - If measuring line coverage, the values are sets of line numbers.
# - If measuring arcs in the Python tracer, the values are sets of arcs (pairs
# of line numbers).
# - If measuring arcs in the C tracer, the values are sets of packed arcs (two
# line numbers combined into one integer).
TTraceFileData = Union[Set[TLineNo], Set[TArc], Set[int]]
TTraceData = Dict[str, TTraceFileData]
class TTracer(Protocol):
"""Either CTracer or PyTracer."""
data: TTraceData
trace_arcs: bool
should_trace: Callable[[str, FrameType], TFileDisposition]
should_trace_cache: Mapping[str, Optional[TFileDisposition]]
should_start_context: Optional[Callable[[FrameType], Optional[str]]]
switch_context: Optional[Callable[[Optional[str]], None]]
warn: TWarnFn
def __init__(self) -> None:
...
def start(self) -> TTraceFn:
"""Start this tracer, returning a trace function."""
def stop(self) -> None:
"""Stop this tracer."""
def activity(self) -> bool:
"""Has there been any activity?"""
def reset_activity(self) -> None:
"""Reset the activity() flag."""
def get_stats(self) -> Optional[Dict[str, int]]:
"""Return a dictionary of statistics, or None."""
## Coverage
# Many places use kwargs as Coverage kwargs.
TCovKwargs = Any
## Configuration
# One value read from a config file.
TConfigValueIn = Optional[Union[bool, int, float, str, Iterable[str]]]
TConfigValueOut = Optional[Union[bool, int, float, str, List[str]]]
# An entire config section, mapping option names to values.
TConfigSectionIn = Mapping[str, TConfigValueIn]
TConfigSectionOut = Mapping[str, TConfigValueOut]
class TConfigurable(Protocol):
"""Something that can proxy to the coverage configuration settings."""
def get_option(self, option_name: str) -> Optional[TConfigValueOut]:
"""Get an option from the configuration.
`option_name` is a colon-separated string indicating the section and
option name. For example, the ``branch`` option in the ``[run]``
section of the config file would be indicated with `"run:branch"`.
Returns the value of the option.
"""
def set_option(self, option_name: str, value: Union[TConfigValueIn, TConfigSectionIn]) -> None:
"""Set an option in the configuration.
`option_name` is a colon-separated string indicating the section and
option name. For example, the ``branch`` option in the ``[run]``
section of the config file would be indicated with `"run:branch"`.
`value` is the new value for the option.
"""
class TPluginConfig(Protocol):
"""Something that can provide options to a plugin."""
def get_plugin_options(self, plugin: str) -> TConfigSectionOut:
"""Get the options for a plugin."""
## Parsing
TMorf = Union[ModuleType, str]
TSourceTokenLines = Iterable[List[Tuple[str, str]]]
## Plugins
class TPlugin(Protocol):
"""What all plugins have in common."""
_coverage_plugin_name: str
_coverage_enabled: bool
## Debugging
class TWarnFn(Protocol):
"""A callable warn() function."""
def __call__(self, msg: str, slug: Optional[str] = None, once: bool = False) -> None:
...
class TDebugCtl(Protocol):
"""A DebugControl object, or something like it."""
def should(self, option: str) -> bool:
"""Decide whether to output debug information in category `option`."""
def write(self, msg: str) -> None:
"""Write a line of debug output."""
class TWritable(Protocol):
"""Anything that can be written to."""
def write(self, msg: str) -> None:
"""Write a message."""
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