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from __future__ import absolute_import |
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import atexit |
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import inspect |
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import os |
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from functools import partial |
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from .actions import Action |
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from .actions import CodePrinter |
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from .actions import Debugger |
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from .actions import VarsPrinter |
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try: |
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if os.environ.get("PUREPYTHONHUNTER"): |
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raise ImportError("Skipped") |
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from ._predicates import And as _And |
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from ._predicates import Not |
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from ._predicates import Or as _Or |
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from ._predicates import When |
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from ._predicates import Query |
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from ._tracer import Tracer |
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except ImportError: |
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from .predicates import And as _And |
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from .predicates import Not |
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from .predicates import Or as _Or |
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from .predicates import When |
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from .predicates import Query |
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from .tracer import Tracer |
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__version__ = "1.0.2" |
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__all__ = ( |
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'And', |
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'CodePrinter', |
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'Debugger', |
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'Not', |
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'Or', |
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'Q', |
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'Query', |
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'stop', |
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'trace', |
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'VarsPrinter', |
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'When', |
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) |
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_current_tracer = None |
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def Q(*predicates, **query): |
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""" |
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Handles situations where :class:`hunter.Query` objects (or other callables) are passed in as positional arguments. |
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Conveniently converts that to an :class:`hunter.And` predicate. |
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""" |
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optional_actions = query.pop("actions", []) |
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if "action" in query: |
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optional_actions.append(query.pop("action")) |
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if predicates: |
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predicates = tuple( |
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p() if inspect.isclass(p) and issubclass(p, Action) else p |
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for p in predicates |
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) |
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if any(isinstance(p, CodePrinter) for p in predicates): |
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if CodePrinter in optional_actions: |
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optional_actions.remove(CodePrinter) |
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if query: |
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predicates += Query(**query), |
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result = And(*predicates) |
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else: |
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result = Query(**query) |
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if optional_actions: |
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result = When(result, *optional_actions) |
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return result |
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def _flatten(cls, predicate, *predicates): |
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if not predicates: |
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return predicate |
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else: |
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all_predicates = [] |
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if isinstance(predicate, cls): |
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all_predicates.extend(predicate.predicates) |
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else: |
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all_predicates.append(predicate) |
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for p in predicates: |
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if isinstance(p, cls): |
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all_predicates.extend(p.predicates) |
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else: |
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all_predicates.append(p) |
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return cls(*all_predicates) |
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def And(*predicates, **kwargs): |
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""" |
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`And` predicate. Exits at the first sub-predicate that returns ``False``. |
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""" |
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if kwargs: |
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predicates += Query(**kwargs), |
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return _flatten(_And, *predicates) |
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def Or(*predicates, **kwargs): |
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""" |
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`And` predicate. Exits at the first sub-predicate that returns ``False``. |
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""" |
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if kwargs: |
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predicates += tuple(Query(**{k: v}) for k, v in kwargs.items()) |
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return _flatten(_Or, *predicates) |
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def stop(): |
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""" |
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Stop tracing. |
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Notes: |
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Restores previous tracer (if there was any). |
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""" |
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global _current_tracer |
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if _current_tracer is not None: |
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_current_tracer.stop() |
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_current_tracer = None |
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128
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def _prepare_predicate(*predicates, **options): |
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if "action" not in options and "actions" not in options: |
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options["action"] = CodePrinter |
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return Q(*predicates, **options) |
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def trace(*predicates, **options): |
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""" |
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Starts tracing. Can be used as a context manager (with slightly incorrect semantics - it starts tracing |
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before ``__enter__`` is called). |
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Parameters: |
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*predicates (callables): Runs actions if any of the given predicates match. |
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Keyword Args: |
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clear_env_var: Disables tracing in subprocess. Default: ``False``. |
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action: Action to run if all the predicates return ``True``. Default: ``CodePrinter``. |
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actions: Actions to run (in case you want more than 1). |
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""" |
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global _current_tracer |
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predicate = _prepare_predicate(*predicates, **options) |
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clear_env_var = options.pop("clear_env_var", False) |
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152
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if clear_env_var: |
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os.environ.pop("PYTHONHUNTER", None) |
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try: |
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_current_tracer = Tracer() |
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return _current_tracer.trace(predicate) |
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finally: |
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atexit.register(_current_tracer.stop) |
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ionelmc /
python-hunter
