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import traceback |
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from pyprint.Printer import Printer |
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from coalib.misc.Decorators import enforce_signature |
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from coalib.output.printers.LogPrinter import LogPrinter |
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from coalib.settings.FunctionMetadata import FunctionMetadata |
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from coalib.settings.Section import Section |
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class Bear(Printer, LogPrinter): |
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""" |
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A bear contains the actual subroutine that is responsible for checking |
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source code for certain specifications. However it can actually do |
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whatever it wants with the files it gets. If you are missing some Result |
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type, feel free to contact us and/or help us extending the coalib. |
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This is the base class for every bear. If you want to write an bear, you |
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will probably want to look at the GlobalBear and LocalBear classes that |
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inherit from this class. In any case you'll want to overwrite at least the |
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run method. You can send debug/warning/error messages through the |
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debug(), warn(), err() functions. These will send the |
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appropriate messages so that they are outputted. Be aware that if you use |
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err(), you are expected to also terminate the bear run-through |
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immediately. |
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If you need some setup or teardown for your bear, feel free to overwrite |
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the set_up() and tear_down() functions. They will be invoked |
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before/after every run invocation. |
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Settings are available at all times through self.section. |
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""" |
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@enforce_signature |
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def __init__(self, |
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section: Section, |
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message_queue, |
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timeout=0): |
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""" |
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Constructs a new bear. |
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:param section: The section object where bear settings are |
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contained. |
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:param message_queue: The queue object for messages. Can be `None`. |
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:param timeout: The time the bear is allowed to run. To set no |
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time limit, use 0. |
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:raises TypeError: Raised when `message_queue` is no queue. |
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:raises RuntimeError: Raised when bear requirements are not fulfilled. |
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""" |
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Printer.__init__(self) |
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LogPrinter.__init__(self, self) |
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if message_queue is not None and not hasattr(message_queue, "put"): |
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raise TypeError("message_queue has to be a Queue or None.") |
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self.section = section |
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self.message_queue = message_queue |
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self.timeout = timeout |
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cp = self.check_prerequisites() |
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if cp is not True: |
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error_string = ("The bear " + type(self).__name__ + |
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" does not fulfill all requirements.") |
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if cp is not False: |
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error_string += " " + cp |
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self.warn(error_string) |
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raise RuntimeError(error_string) |
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def _print(self, output, **kwargs): |
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self.debug(output) |
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def log_message(self, log_message, timestamp=None, **kwargs): |
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if self.message_queue is not None: |
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self.message_queue.put(log_message) |
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def run(self, *args, dependency_results=None, **kwargs): |
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raise NotImplementedError |
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def run_bear_from_section(self, args, kwargs): |
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try: |
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kwargs.update( |
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self.get_metadata().create_params_from_section(self.section)) |
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except ValueError as err: |
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self.warn("The bear {} cannot be executed.".format( |
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type(self).__name__), str(err)) |
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return |
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return self.run(*args, **kwargs) |
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def execute(self, *args, **kwargs): |
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name = type(self).__name__ |
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try: |
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self.debug("Running bear {}...".format(name)) |
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# If it's already a list it won't change it |
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return list(self.run_bear_from_section(args, kwargs) or []) |
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except: |
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self.warn( |
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"Bear {} failed to run. Take a look at debug messages for " |
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"further information.".format(name)) |
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self.debug( |
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"The bear {bear} raised an exception. If you are the writer " |
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"of this bear, please make sure to catch all exceptions. If " |
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"not and this error annoys you, you might want to get in " |
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"contact with the writer of this bear.\n\nTraceback " |
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"information is provided below:\n\n{traceback}" |
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"\n".format(bear=name, traceback=traceback.format_exc())) |
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@staticmethod |
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def kind(): |
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""" |
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:return: The kind of the bear |
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""" |
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raise NotImplementedError |
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@classmethod |
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def get_metadata(cls): |
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""" |
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:return: Metadata for the run function. However parameters like `self` |
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or parameters implicitly used by coala (e.g. filename for |
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local bears) are already removed. |
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""" |
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return FunctionMetadata.from_function( |
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cls.run, |
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omit={"self", "dependency_results"}) |
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@classmethod |
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def missing_dependencies(cls, lst): |
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""" |
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Checks if the given list contains all dependencies. |
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:param lst: A list of all already resolved bear classes (not |
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instances). |
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:return: A list of missing dependencies. |
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""" |
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dep_classes = cls.get_dependencies() |
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for item in lst: |
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if item in dep_classes: |
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dep_classes.remove(item) |
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return dep_classes |
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@staticmethod |
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def get_dependencies(): |
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""" |
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Retrieves bear classes that are to be executed before this bear gets |
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executed. The results of these bears will then be passed to the |
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run method as a dict via the dependency_results argument. The dict |
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will have the name of the Bear as key and the list of its results as |
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results. |
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:return: A list of bear classes. |
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""" |
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return [] |
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@classmethod |
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def get_non_optional_settings(cls): |
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""" |
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This method has to determine which settings are needed by this bear. |
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The user will be prompted for needed settings that are not available |
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in the settings file so don't include settings where a default value |
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would do. |
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:return: A dictionary of needed settings as keys and a tuple of help |
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text and annotation as values |
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""" |
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return cls.get_metadata().non_optional_params |
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@staticmethod |
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def check_prerequisites(): |
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""" |
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Checks whether needed runtime prerequisites of the bear are satisfied. |
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This function gets executed at construction and returns True by |
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default. |
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:return: True if prerequisites are satisfied, else False or a string |
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that serves a more detailed description of what's missing. |
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""" |
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return True |
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coala-analyzer /
coala
