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Backport PR #3424 on branch yt-4.0.x (implement AthenaDataset._is_valid) #3572

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merged 1 commit into from
Oct 16, 2021
Merged

Backport PR #3424 on branch yt-4.0.x (implement AthenaDataset._is_valid) #3572

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19 changes: 13 additions & 6 deletions yt/frontends/athena/data_structures.py
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Original file line number Diff line number Diff line change
@@ -1,4 +1,5 @@
import os
import re
import weakref

import numpy as np
Expand Down Expand Up @@ -632,12 +633,18 @@ def _parse_parameter_file(self):

@classmethod
def _is_valid(cls, filename, *args, **kwargs):
try:
if "vtk" in filename:
return True
except Exception:
pass
return False
if not filename.endswith(".vtk"):
return False

with open(filename, "rb") as fh:
if not re.match(b"# vtk DataFile Version \\d\\.\\d\n", fh.readline(256)):
return False
if not re.match(
b"(CONSERVED|PRIMITIVE) vars at time= .*, level= \\d, domain= \\d\n",
fh.readline(256),
):
return False
return True

@property
def _skip_cache(self):
Expand Down