tests versuch 2

venv/lib/python3.11/site-packages/coverage/plugin_support.py

@@ -0,0 +1,297 @@
+# 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."""
+
+from __future__ import annotations
+
+import os
+import os.path
+import sys
+
+from types import FrameType
+from typing import Any, Dict, Iterable, Iterator, List, Optional, Set, Tuple, Union
+
+from coverage.exceptions import PluginError
+from coverage.misc import isolate_module
+from coverage.plugin import CoveragePlugin, FileTracer, FileReporter
+from coverage.types import (
+    TArc, TConfigurable, TDebugCtl, TLineNo, TPluginConfig, TSourceTokenLines,
+)
+
+os = isolate_module(os)
+
+
+class Plugins:
+    """The currently loaded collection of coverage.py plugins."""
+
+    def __init__(self) -> None:
+        self.order: List[CoveragePlugin] = []
+        self.names: Dict[str, CoveragePlugin] = {}
+        self.file_tracers: List[CoveragePlugin] = []
+        self.configurers: List[CoveragePlugin] = []
+        self.context_switchers: List[CoveragePlugin] = []
+
+        self.current_module: Optional[str] = None
+        self.debug: Optional[TDebugCtl]
+
+    @classmethod
+    def load_plugins(
+        cls,
+        modules: Iterable[str],
+        config: TPluginConfig,
+        debug: Optional[TDebugCtl] = None,
+    ) -> Plugins:
+        """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 PluginError(
+                    f"Plugin module {module!r} didn't define a coverage_init function"
+                )
+
+            options = config.get_plugin_options(module)
+            coverage_init(plugins, options)
+
+        plugins.current_module = None
+        return plugins
+
+    def add_file_tracer(self, plugin: CoveragePlugin) -> None:
+        """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: CoveragePlugin) -> None:
+        """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: CoveragePlugin) -> None:
+        """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: CoveragePlugin) -> None:
+        """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: CoveragePlugin,
+        specialized: Optional[List[CoveragePlugin]],
+    ) -> None:
+        """Add a plugin object.
+
+        `plugin` is a :class:`CoveragePlugin` instance to add.  `specialized`
+        is a list to append the plugin to.
+
+        """
+        plugin_name = f"{self.current_module}.{plugin.__class__.__name__}"
+        if self.debug and self.debug.should("plugin"):
+            self.debug.write(f"Loaded plugin {self.current_module!r}: {plugin!r}")
+            labelled = LabelledDebug(f"plugin {self.current_module!r}", self.debug)
+            plugin = DebugPluginWrapper(plugin, labelled)
+
+        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 __bool__(self) -> bool:
+        return bool(self.order)
+
+    def __iter__(self) -> Iterator[CoveragePlugin]:
+        return iter(self.order)
+
+    def get(self, plugin_name: str) -> CoveragePlugin:
+        """Return a plugin by name."""
+        return self.names[plugin_name]
+
+
+class LabelledDebug:
+    """A Debug writer, but with labels for prepending to the messages."""
+
+    def __init__(self, label: str, debug: TDebugCtl, prev_labels: Iterable[str] = ()):
+        self.labels = list(prev_labels) + [label]
+        self.debug = debug
+
+    def add_label(self, label: str) -> LabelledDebug:
+        """Add a label to the writer, and return a new `LabelledDebug`."""
+        return LabelledDebug(label, self.debug, self.labels)
+
+    def message_prefix(self) -> str:
+        """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: str) -> None:
+        """Write `message`, but with the labels prepended."""
+        self.debug.write(f"{self.message_prefix()}{message}")
+
+
+class DebugPluginWrapper(CoveragePlugin):
+    """Wrap a plugin, and use debug to report on what it's doing."""
+
+    def __init__(self, plugin: CoveragePlugin, debug: LabelledDebug) -> None:
+        super().__init__()
+        self.plugin = plugin
+        self.debug = debug
+
+    def file_tracer(self, filename: str) -> Optional[FileTracer]:
+        tracer = self.plugin.file_tracer(filename)
+        self.debug.write(f"file_tracer({filename!r}) --> {tracer!r}")
+        if tracer:
+            debug = self.debug.add_label(f"file {filename!r}")
+            tracer = DebugFileTracerWrapper(tracer, debug)
+        return tracer
+
+    def file_reporter(self, filename: str) -> Union[FileReporter, str]:
+        reporter = self.plugin.file_reporter(filename)
+        assert isinstance(reporter, FileReporter)
+        self.debug.write(f"file_reporter({filename!r}) --> {reporter!r}")
+        if reporter:
+            debug = self.debug.add_label(f"file {filename!r}")
+            reporter = DebugFileReporterWrapper(filename, reporter, debug)
+        return reporter
+
+    def dynamic_context(self, frame: FrameType) -> Optional[str]:
+        context = self.plugin.dynamic_context(frame)
+        self.debug.write(f"dynamic_context({frame!r}) --> {context!r}")
+        return context
+
+    def find_executable_files(self, src_dir: str) -> Iterable[str]:
+        executable_files = self.plugin.find_executable_files(src_dir)
+        self.debug.write(f"find_executable_files({src_dir!r}) --> {executable_files!r}")
+        return executable_files
+
+    def configure(self, config: TConfigurable) -> None:
+        self.debug.write(f"configure({config!r})")
+        self.plugin.configure(config)
+
+    def sys_info(self) -> Iterable[Tuple[str, Any]]:
+        return self.plugin.sys_info()
+
+
+class DebugFileTracerWrapper(FileTracer):
+    """A debugging `FileTracer`."""
+
+    def __init__(self, tracer: FileTracer, debug: LabelledDebug) -> None:
+        self.tracer = tracer
+        self.debug = debug
+
+    def _show_frame(self, frame: FrameType) -> str:
+        """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) -> str:
+        sfilename = self.tracer.source_filename()
+        self.debug.write(f"source_filename() --> {sfilename!r}")
+        return sfilename
+
+    def has_dynamic_source_filename(self) -> bool:
+        has = self.tracer.has_dynamic_source_filename()
+        self.debug.write(f"has_dynamic_source_filename() --> {has!r}")
+        return has
+
+    def dynamic_source_filename(self, filename: str, frame: FrameType) -> Optional[str]:
+        dyn = self.tracer.dynamic_source_filename(filename, frame)
+        self.debug.write("dynamic_source_filename({!r}, {}) --> {!r}".format(
+            filename, self._show_frame(frame), dyn,
+        ))
+        return dyn
+
+    def line_number_range(self, frame: FrameType) -> Tuple[TLineNo, TLineNo]:
+        pair = self.tracer.line_number_range(frame)
+        self.debug.write(f"line_number_range({self._show_frame(frame)}) --> {pair!r}")
+        return pair
+
+
+class DebugFileReporterWrapper(FileReporter):
+    """A debugging `FileReporter`."""
+
+    def __init__(self, filename: str, reporter: FileReporter, debug: LabelledDebug) -> None:
+        super().__init__(filename)
+        self.reporter = reporter
+        self.debug = debug
+
+    def relative_filename(self) -> str:
+        ret = self.reporter.relative_filename()
+        self.debug.write(f"relative_filename() --> {ret!r}")
+        return ret
+
+    def lines(self) -> Set[TLineNo]:
+        ret = self.reporter.lines()
+        self.debug.write(f"lines() --> {ret!r}")
+        return ret
+
+    def excluded_lines(self) -> Set[TLineNo]:
+        ret = self.reporter.excluded_lines()
+        self.debug.write(f"excluded_lines() --> {ret!r}")
+        return ret
+
+    def translate_lines(self, lines: Iterable[TLineNo]) -> Set[TLineNo]:
+        ret = self.reporter.translate_lines(lines)
+        self.debug.write(f"translate_lines({lines!r}) --> {ret!r}")
+        return ret
+
+    def translate_arcs(self, arcs: Iterable[TArc]) -> Set[TArc]:
+        ret = self.reporter.translate_arcs(arcs)
+        self.debug.write(f"translate_arcs({arcs!r}) --> {ret!r}")
+        return ret
+
+    def no_branch_lines(self) -> Set[TLineNo]:
+        ret = self.reporter.no_branch_lines()
+        self.debug.write(f"no_branch_lines() --> {ret!r}")
+        return ret
+
+    def exit_counts(self) -> Dict[TLineNo, int]:
+        ret = self.reporter.exit_counts()
+        self.debug.write(f"exit_counts() --> {ret!r}")
+        return ret
+
+    def arcs(self) -> Set[TArc]:
+        ret = self.reporter.arcs()
+        self.debug.write(f"arcs() --> {ret!r}")
+        return ret
+
+    def source(self) -> str:
+        ret = self.reporter.source()
+        self.debug.write("source() --> %d chars" % (len(ret),))
+        return ret
+
+    def source_token_lines(self) -> TSourceTokenLines:
+        ret = list(self.reporter.source_token_lines())
+        self.debug.write("source_token_lines() --> %d tokens" % (len(ret),))
+        return ret