skipping: move MarkEvaluator from _pytest.mark.evaluate to _pytest.skipping

This type was actually in `_pytest.skipping` previously, but was moved to
`_pytest.mark.evaluate` in cf40c0743c.

I think the previous location was more appropriate, because the
`MarkEvaluator` is not a generic mark facility, it is explicitly and
exclusively used by the `skipif` and `xfail` marks to evaluate their
particular set of arguments. So it is better to put it in the plugin
code.

Putting `skipping` related functionality into the core `_pytest.mark`
module also causes some import cycles which we can avoid.
This commit is contained in:
Ran Benita 2020-06-19 13:33:54 +03:00
parent a1f841d5d2
commit 6072c9950d
2 changed files with 125 additions and 130 deletions

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@ -1,124 +0,0 @@
import os
import platform
import sys
import traceback
from typing import Any
from typing import Dict
from typing import List
from typing import Optional
from ..outcomes import fail
from ..outcomes import TEST_OUTCOME
from .structures import Mark
from _pytest.nodes import Item
def compiled_eval(expr: str, d: Dict[str, object]) -> Any:
import _pytest._code
exprcode = _pytest._code.compile(expr, mode="eval")
return eval(exprcode, d)
class MarkEvaluator:
def __init__(self, item: Item, name: str) -> None:
self.item = item
self._marks = None # type: Optional[List[Mark]]
self._mark = None # type: Optional[Mark]
self._mark_name = name
def __bool__(self) -> bool:
# don't cache here to prevent staleness
return bool(self._get_marks())
def wasvalid(self) -> bool:
return not hasattr(self, "exc")
def _get_marks(self) -> List[Mark]:
return list(self.item.iter_markers(name=self._mark_name))
def invalidraise(self, exc) -> Optional[bool]:
raises = self.get("raises")
if not raises:
return None
return not isinstance(exc, raises)
def istrue(self) -> bool:
try:
return self._istrue()
except TEST_OUTCOME:
self.exc = sys.exc_info()
if isinstance(self.exc[1], SyntaxError):
# TODO: Investigate why SyntaxError.offset is Optional, and if it can be None here.
assert self.exc[1].offset is not None
msg = [" " * (self.exc[1].offset + 4) + "^"]
msg.append("SyntaxError: invalid syntax")
else:
msg = traceback.format_exception_only(*self.exc[:2])
fail(
"Error evaluating %r expression\n"
" %s\n"
"%s" % (self._mark_name, self.expr, "\n".join(msg)),
pytrace=False,
)
def _getglobals(self) -> Dict[str, object]:
d = {"os": os, "sys": sys, "platform": platform, "config": self.item.config}
if hasattr(self.item, "obj"):
d.update(self.item.obj.__globals__) # type: ignore[attr-defined] # noqa: F821
return d
def _istrue(self) -> bool:
if hasattr(self, "result"):
result = getattr(self, "result") # type: bool
return result
self._marks = self._get_marks()
if self._marks:
self.result = False
for mark in self._marks:
self._mark = mark
if "condition" not in mark.kwargs:
args = mark.args
else:
args = (mark.kwargs["condition"],)
for expr in args:
self.expr = expr
if isinstance(expr, str):
d = self._getglobals()
result = compiled_eval(expr, d)
else:
if "reason" not in mark.kwargs:
# XXX better be checked at collection time
msg = (
"you need to specify reason=STRING "
"when using booleans as conditions."
)
fail(msg)
result = bool(expr)
if result:
self.result = True
self.reason = mark.kwargs.get("reason", None)
self.expr = expr
return self.result
if not args:
self.result = True
self.reason = mark.kwargs.get("reason", None)
return self.result
return False
def get(self, attr, default=None):
if self._mark is None:
return default
return self._mark.kwargs.get(attr, default)
def getexplanation(self):
expl = getattr(self, "reason", None) or self.get("reason", None)
if not expl:
if not hasattr(self, "expr"):
return ""
else:
return "condition: " + str(self.expr)
return expl

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@ -1,25 +1,28 @@
""" support for skip/xfail functions and markers. """
import os
import platform
import sys
import traceback
from typing import Any
from typing import Dict
from typing import List
from typing import Optional
from typing import Tuple
from _pytest.config import Config
from _pytest.config import hookimpl
from _pytest.config.argparsing import Parser
from _pytest.mark.evaluate import MarkEvaluator
from _pytest.mark.structures import Mark
from _pytest.nodes import Item
from _pytest.outcomes import fail
from _pytest.outcomes import skip
from _pytest.outcomes import TEST_OUTCOME
from _pytest.outcomes import xfail
from _pytest.reports import BaseReport
from _pytest.runner import CallInfo
from _pytest.store import StoreKey
skipped_by_mark_key = StoreKey[bool]()
evalxfail_key = StoreKey[MarkEvaluator]()
unexpectedsuccess_key = StoreKey[str]()
def pytest_addoption(parser: Parser) -> None:
group = parser.getgroup("general")
group.addoption(
@ -79,6 +82,122 @@ def pytest_configure(config: Config) -> None:
)
def compiled_eval(expr: str, d: Dict[str, object]) -> Any:
import _pytest._code
exprcode = _pytest._code.compile(expr, mode="eval")
return eval(exprcode, d)
class MarkEvaluator:
def __init__(self, item: Item, name: str) -> None:
self.item = item
self._marks = None # type: Optional[List[Mark]]
self._mark = None # type: Optional[Mark]
self._mark_name = name
def __bool__(self) -> bool:
# don't cache here to prevent staleness
return bool(self._get_marks())
def wasvalid(self) -> bool:
return not hasattr(self, "exc")
def _get_marks(self) -> List[Mark]:
return list(self.item.iter_markers(name=self._mark_name))
def invalidraise(self, exc) -> Optional[bool]:
raises = self.get("raises")
if not raises:
return None
return not isinstance(exc, raises)
def istrue(self) -> bool:
try:
return self._istrue()
except TEST_OUTCOME:
self.exc = sys.exc_info()
if isinstance(self.exc[1], SyntaxError):
# TODO: Investigate why SyntaxError.offset is Optional, and if it can be None here.
assert self.exc[1].offset is not None
msg = [" " * (self.exc[1].offset + 4) + "^"]
msg.append("SyntaxError: invalid syntax")
else:
msg = traceback.format_exception_only(*self.exc[:2])
fail(
"Error evaluating %r expression\n"
" %s\n"
"%s" % (self._mark_name, self.expr, "\n".join(msg)),
pytrace=False,
)
def _getglobals(self) -> Dict[str, object]:
d = {"os": os, "sys": sys, "platform": platform, "config": self.item.config}
if hasattr(self.item, "obj"):
d.update(self.item.obj.__globals__) # type: ignore[attr-defined] # noqa: F821
return d
def _istrue(self) -> bool:
if hasattr(self, "result"):
result = getattr(self, "result") # type: bool
return result
self._marks = self._get_marks()
if self._marks:
self.result = False
for mark in self._marks:
self._mark = mark
if "condition" not in mark.kwargs:
args = mark.args
else:
args = (mark.kwargs["condition"],)
for expr in args:
self.expr = expr
if isinstance(expr, str):
d = self._getglobals()
result = compiled_eval(expr, d)
else:
if "reason" not in mark.kwargs:
# XXX better be checked at collection time
msg = (
"you need to specify reason=STRING "
"when using booleans as conditions."
)
fail(msg)
result = bool(expr)
if result:
self.result = True
self.reason = mark.kwargs.get("reason", None)
self.expr = expr
return self.result
if not args:
self.result = True
self.reason = mark.kwargs.get("reason", None)
return self.result
return False
def get(self, attr, default=None):
if self._mark is None:
return default
return self._mark.kwargs.get(attr, default)
def getexplanation(self):
expl = getattr(self, "reason", None) or self.get("reason", None)
if not expl:
if not hasattr(self, "expr"):
return ""
else:
return "condition: " + str(self.expr)
return expl
skipped_by_mark_key = StoreKey[bool]()
evalxfail_key = StoreKey[MarkEvaluator]()
unexpectedsuccess_key = StoreKey[str]()
@hookimpl(tryfirst=True)
def pytest_runtest_setup(item: Item) -> None:
# Check if skip or skipif are specified as pytest marks