Mercurial Repositories > eric / file comparison
comparison: DebugClients/Python3/coverage/files.py
DebugClients/Python3/coverage/files.py
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- de9c2efb9d02
- child 29
- 391dc0bc4ae5
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| 1 """File wrangling.""" | |
| 2 | |
| 3 import os, sys | |
| 4 | |
| 5 class FileLocator: | |
| 6 """Understand how filenames work.""" | |
| 7 | |
| 8 def __init__(self): | |
| 9 self.relative_dir = self.abs_file(os.curdir) + os.sep | |
| 10 | |
| 11 # Cache of results of calling the canonical_filename() method, to | |
| 12 # avoid duplicating work. | |
| 13 self.canonical_filename_cache = {} | |
| 14 | |
| 15 def abs_file(self, filename): | |
| 16 """Return the absolute normalized form of `filename`.""" | |
| 17 return os.path.normcase(os.path.abspath(os.path.realpath(filename))) | |
| 18 | |
| 19 def relative_filename(self, filename): | |
| 20 """Return the relative form of `filename`. | |
| 21 | |
| 22 The filename will be relative to the current directory when the | |
| 23 FileLocator was constructed. | |
| 24 | |
| 25 """ | |
| 26 return filename.replace(self.relative_dir, "") | |
| 27 | |
| 28 def canonical_filename(self, filename): | |
| 29 """Return a canonical filename for `filename`. | |
| 30 | |
| 31 An absolute path with no redundant components and normalized case. | |
| 32 | |
| 33 """ | |
| 34 if filename not in self.canonical_filename_cache: | |
| 35 f = filename | |
| 36 if os.path.isabs(f) and not os.path.exists(f): | |
| 37 if not self.get_zip_data(f): | |
| 38 f = os.path.basename(f) | |
| 39 if not os.path.isabs(f): | |
| 40 for path in [os.curdir] + sys.path: | |
| 41 g = os.path.join(path, f) | |
| 42 if os.path.exists(g): | |
| 43 f = g | |
| 44 break | |
| 45 cf = self.abs_file(f) | |
| 46 self.canonical_filename_cache[filename] = cf | |
| 47 return self.canonical_filename_cache[filename] | |
| 48 | |
| 49 def get_zip_data(self, filename): | |
| 50 """Get data from `filename` if it is a zip file path. | |
| 51 | |
| 52 Returns the data read from the zip file, or None if no zip file could | |
| 53 be found or `filename` isn't in it. | |
| 54 | |
| 55 """ | |
| 56 import zipimport | |
| 57 markers = ['.zip'+os.sep, '.egg'+os.sep] | |
| 58 for marker in markers: | |
| 59 if marker in filename: | |
| 60 parts = filename.split(marker) | |
| 61 try: | |
| 62 zi = zipimport.zipimporter(parts[0]+marker[:-1]) | |
| 63 except zipimport.ZipImportError: | |
| 64 continue | |
| 65 try: | |
| 66 data = zi.get_data(parts[1]) | |
| 67 except IOError: | |
| 68 continue | |
| 69 return data | |
| 70 return None |
