fix(stats): more robust frame parsing

The previous frame parsing logic was wrong and therefore was not
handling certain paths, especially those on Windows, correctly.
As a consequence, sample files collected on Windows would fail to
parse with the tools provided by the library, like austin2speedscope.

Fixes #6.

austin/format/speedscope.py

@@ -35,6 +35,8 @@
 from austin.stats import MetricType
 from austin.stats import Sample
 
+__version__ = "0.2.1"
+
 SpeedscopeJson = Dict
 SpeedscopeWeight = int
 ProfileName = str
@@ -158,7 +160,7 @@ def asdict(self) -> SpeedscopeJson:
                 key=lambda p: p["name"].rsplit(maxsplit=1)[-1],
             ),
             "name": self.name,
-            "exporter": "Austin2Speedscope Converter 0.2.0",
+            "exporter": f"Austin2Speedscope Converter {__version__}",
         }
 
     def dump(self, stream: TextIO) -> None:
@@ -196,7 +198,7 @@ def main() -> None:
         "--indent", type=int, help="Give a non-null value to prettify the JSON output."
     )
 
-    arg_parser.add_argument("-V", "--version", action="version", version="0.1.0")
+    arg_parser.add_argument("-V", "--version", action="version", version=__version__)
 
     args = arg_parser.parse_args()
 

austin/stats.py

@@ -184,7 +184,7 @@ def parse(frame: str) -> "Frame":
             raise InvalidFrame(frame)
 
         try:
-            module, function, line = frame.rsplit(":", maxsplit=3)
+            module, function, line = frame.rsplit(":", maxsplit=2)
         except ValueError:
             raise InvalidFrame(frame) from None
         return Frame(function, module, int(line))

noxfile.py

@@ -16,7 +16,7 @@
     "3.9",
     "3.10",
 ]
-REQUESTED_PYTHON_VERSION = os.getenv("PYTHON") or SUPPORTED_PYTHON_VERSIONS
+REQUESTED_PYTHON_VERSION = os.getenv("PYTHON") or SUPPORTED_PYTHON_VERSIONS[-1]
 
 if sys.platform == "win32":
     PYTEST_OPTIONS = ["-vvvs"]
@@ -83,7 +83,7 @@ def mypy(session):
     )
 
 
-@nox.session(python="3.8")
+@nox.session(python="3.9")
 def coverage(session):
     """Upload coverage data."""
     install_with_constraints(session, "coverage[toml]", "codecov")

test/data/austin.json

@@ -513,5 +513,5 @@
     }
   ],
   "name": "austin.out",
-  "exporter": "Austin2Speedscope Converter 0.2.0"
+  "exporter": "Austin2Speedscope Converter 0.2.1"
 }

test/stats/test_frame.py

@@ -45,3 +45,9 @@ def test_frame_parser_invalid():
 
 def test_frame_str():
     assert str(Frame("foo", "foo_module", 10)) == "foo_module:foo:10"
+
+
+def test_frame_win_drive():
+    assert Frame.parse("C:\\user\\bar.py:foo:42") == Frame(
+        "foo", "C:\\user\\bar.py", 42
+    )