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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 """Support for plugins.""" import os import os.path import sys from coverage.misc import CoverageException, isolate_module from coverage.plugin import CoveragePlugin, FileTracer, FileReporter os = isolate_module(os) class Plugins(object): """The currently loaded collection of coverage.py plugins.""" def __init__(self): self.order = [] self.names = {} self.file_tracers = [] self.configurers = [] self.context_switchers = [] self.current_module = None self.debug = None @classmethod def load_plugins(cls, modules, config, debug=None): """Load plugins from `modules`. Returns a Plugins object with the loaded and configured plugins. """ plugins = cls() plugins.debug = debug for module in modules: plugins.current_module = module __import__(module) mod = sys.modules[module] coverage_init = getattr(mod, "coverage_init", None) if not coverage_init: raise CoverageException( "Plugin module %r didn't define a coverage_init function" % module ) options = config.get_plugin_options(module) coverage_init(plugins, options) plugins.current_module = None return plugins def add_file_tracer(self, plugin): """Add a file tracer plugin. `plugin` is an instance of a third-party plugin class. It must implement the :meth:`CoveragePlugin.file_tracer` method. """ self._add_plugin(plugin, self.file_tracers) def add_configurer(self, plugin): """Add a configuring plugin. `plugin` is an instance of a third-party plugin class. It must implement the :meth:`CoveragePlugin.configure` method. """ self._add_plugin(plugin, self.configurers) def add_dynamic_context(self, plugin): """Add a dynamic context plugin. `plugin` is an instance of a third-party plugin class. It must implement the :meth:`CoveragePlugin.dynamic_context` method. """ self._add_plugin(plugin, self.context_switchers) def add_noop(self, plugin): """Add a plugin that does nothing. This is only useful for testing the plugin support. """ self._add_plugin(plugin, None) def _add_plugin(self, plugin, specialized): """Add a plugin object. `plugin` is a :class:`CoveragePlugin` instance to add. `specialized` is a list to append the plugin to. """ plugin_name = "%s.%s" % (self.current_module, plugin.__class__.__name__) if self.debug and self.debug.should('plugin'): self.debug.write("Loaded plugin %r: %r" % (self.current_module, plugin)) labelled = LabelledDebug("plugin %r" % (self.current_module,), self.debug) plugin = DebugPluginWrapper(plugin, labelled) # pylint: disable=attribute-defined-outside-init plugin._coverage_plugin_name = plugin_name plugin._coverage_enabled = True self.order.append(plugin) self.names[plugin_name] = plugin if specialized is not None: specialized.append(plugin) def __nonzero__(self): return bool(self.order) __bool__ = __nonzero__ def __iter__(self): return iter(self.order) def get(self, plugin_name): """Return a plugin by name.""" return self.names[plugin_name] class LabelledDebug(object): """A Debug writer, but with labels for prepending to the messages.""" def __init__(self, label, debug, prev_labels=()): self.labels = list(prev_labels) + [label] self.debug = debug def add_label(self, label): """Add a label to the writer, and return a new `LabelledDebug`.""" return LabelledDebug(label, self.debug, self.labels) def message_prefix(self): """The prefix to use on messages, combining the labels.""" prefixes = self.labels + [''] return ":\n".join(" "*i+label for i, label in enumerate(prefixes)) def write(self, message): """Write `message`, but with the labels prepended.""" self.debug.write("%s%s" % (self.message_prefix(), message)) class DebugPluginWrapper(CoveragePlugin): """Wrap a plugin, and use debug to report on what it's doing.""" def __init__(self, plugin, debug): super(DebugPluginWrapper, self).__init__() self.plugin = plugin self.debug = debug def file_tracer(self, filename): tracer = self.plugin.file_tracer(filename) self.debug.write("file_tracer(%r) --> %r" % (filename, tracer)) if tracer: debug = self.debug.add_label("file %r" % (filename,)) tracer = DebugFileTracerWrapper(tracer, debug) return tracer def file_reporter(self, filename): reporter = self.plugin.file_reporter(filename) self.debug.write("file_reporter(%r) --> %r" % (filename, reporter)) if reporter: debug = self.debug.add_label("file %r" % (filename,)) reporter = DebugFileReporterWrapper(filename, reporter, debug) return reporter def dynamic_context(self, frame): context = self.plugin.dynamic_context(frame) self.debug.write("dynamic_context(%r) --> %r" % (frame, context)) return context def find_executable_files(self, src_dir): executable_files = self.plugin.find_executable_files(src_dir) self.debug.write("find_executable_files(%r) --> %r" % (src_dir, executable_files)) return executable_files def configure(self, config): self.debug.write("configure(%r)" % (config,)) self.plugin.configure(config) def sys_info(self): return self.plugin.sys_info() class DebugFileTracerWrapper(FileTracer): """A debugging `FileTracer`.""" def __init__(self, tracer, debug): self.tracer = tracer self.debug = debug def _show_frame(self, frame): """A short string identifying a frame, for debug messages.""" return "%s@%d" % ( os.path.basename(frame.f_code.co_filename), frame.f_lineno, ) def source_filename(self): sfilename = self.tracer.source_filename() self.debug.write("source_filename() --> %r" % (sfilename,)) return sfilename def has_dynamic_source_filename(self): has = self.tracer.has_dynamic_source_filename() self.debug.write("has_dynamic_source_filename() --> %r" % (has,)) return has def dynamic_source_filename(self, filename, frame): dyn = self.tracer.dynamic_source_filename(filename, frame) self.debug.write("dynamic_source_filename(%r, %s) --> %r" % ( filename, self._show_frame(frame), dyn, )) return dyn def line_number_range(self, frame): pair = self.tracer.line_number_range(frame) self.debug.write("line_number_range(%s) --> %r" % (self._show_frame(frame), pair)) return pair class DebugFileReporterWrapper(FileReporter): """A debugging `FileReporter`.""" def __init__(self, filename, reporter, debug): super(DebugFileReporterWrapper, self).__init__(filename) self.reporter = reporter self.debug = debug def relative_filename(self): ret = self.reporter.relative_filename() self.debug.write("relative_filename() --> %r" % (ret,)) return ret def lines(self): ret = self.reporter.lines() self.debug.write("lines() --> %r" % (ret,)) return ret def excluded_lines(self): ret = self.reporter.excluded_lines() self.debug.write("excluded_lines() --> %r" % (ret,)) return ret def translate_lines(self, lines): ret = self.reporter.translate_lines(lines) self.debug.write("translate_lines(%r) --> %r" % (lines, ret)) return ret def translate_arcs(self, arcs): ret = self.reporter.translate_arcs(arcs) self.debug.write("translate_arcs(%r) --> %r" % (arcs, ret)) return ret def no_branch_lines(self): ret = self.reporter.no_branch_lines() self.debug.write("no_branch_lines() --> %r" % (ret,)) return ret def exit_counts(self): ret = self.reporter.exit_counts() self.debug.write("exit_counts() --> %r" % (ret,)) return ret def arcs(self): ret = self.reporter.arcs() self.debug.write("arcs() --> %r" % (ret,)) return ret def source(self): ret = self.reporter.source() self.debug.write("source() --> %d chars" % (len(ret),)) return ret def source_token_lines(self): ret = list(self.reporter.source_token_lines()) self.debug.write("source_token_lines() --> %d tokens" % (len(ret),)) return ret