| """File wrangling.""" | |
| from coverage.backward import to_string | |
| from coverage.misc import CoverageException | |
| import fnmatch, os, re, sys | |
| class FileLocator(object): | |
| """Understand how filenames work.""" | |
| def __init__(self): | |
| # The absolute path to our current directory. | |
| self.relative_dir = self.abs_file(os.curdir) + os.sep | |
| # Cache of results of calling the canonical_filename() method, to | |
| # avoid duplicating work. | |
| self.canonical_filename_cache = {} | |
| def abs_file(self, filename): | |
| """Return the absolute normalized form of `filename`.""" | |
| return os.path.normcase(os.path.abspath(os.path.realpath(filename))) | |
| def relative_filename(self, filename): | |
| """Return the relative form of `filename`. | |
| The filename will be relative to the current directory when the | |
| `FileLocator` was constructed. | |
| """ | |
| if filename.startswith(self.relative_dir): | |
| filename = filename.replace(self.relative_dir, "") | |
| return filename | |
| def canonical_filename(self, filename): | |
| """Return a canonical filename for `filename`. | |
| An absolute path with no redundant components and normalized case. | |
| """ | |
| if filename not in self.canonical_filename_cache: | |
| f = filename | |
| if os.path.isabs(f) and not os.path.exists(f): | |
| if self.get_zip_data(f) is None: | |
| f = os.path.basename(f) | |
| if not os.path.isabs(f): | |
| for path in [os.curdir] + sys.path: | |
| if path is None: | |
| continue | |
| g = os.path.join(path, f) | |
| if os.path.exists(g): | |
| f = g | |
| break | |
| cf = self.abs_file(f) | |
| self.canonical_filename_cache[filename] = cf | |
| return self.canonical_filename_cache[filename] | |
| def get_zip_data(self, filename): | |
| """Get data from `filename` if it is a zip file path. | |
| Returns the string data read from the zip file, or None if no zip file | |
| could be found or `filename` isn't in it. The data returned will be | |
| an empty string if the file is empty. | |
| """ | |
| import zipimport | |
| markers = ['.zip'+os.sep, '.egg'+os.sep] | |
| for marker in markers: | |
| if marker in filename: | |
| parts = filename.split(marker) | |
| try: | |
| zi = zipimport.zipimporter(parts[0]+marker[:-1]) | |
| except zipimport.ZipImportError: | |
| continue | |
| try: | |
| data = zi.get_data(parts[1]) | |
| except IOError: | |
| continue | |
| return to_string(data) | |
| return None | |
| class TreeMatcher(object): | |
| """A matcher for files in a tree.""" | |
| def __init__(self, directories): | |
| self.dirs = directories[:] | |
| def __repr__(self): | |
| return "<TreeMatcher %r>" % self.dirs | |
| def add(self, directory): | |
| """Add another directory to the list we match for.""" | |
| self.dirs.append(directory) | |
| def match(self, fpath): | |
| """Does `fpath` indicate a file in one of our trees?""" | |
| for d in self.dirs: | |
| if fpath.startswith(d): | |
| if fpath == d: | |
| # This is the same file! | |
| return True | |
| if fpath[len(d)] == os.sep: | |
| # This is a file in the directory | |
| return True | |
| return False | |
| class FnmatchMatcher(object): | |
| """A matcher for files by filename pattern.""" | |
| def __init__(self, pats): | |
| self.pats = pats[:] | |
| def __repr__(self): | |
| return "<FnmatchMatcher %r>" % self.pats | |
| def match(self, fpath): | |
| """Does `fpath` match one of our filename patterns?""" | |
| for pat in self.pats: | |
| if fnmatch.fnmatch(fpath, pat): | |
| return True | |
| return False | |
| def sep(s): | |
| """Find the path separator used in this string, or os.sep if none.""" | |
| sep_match = re.search(r"[\\/]", s) | |
| if sep_match: | |
| the_sep = sep_match.group(0) | |
| else: | |
| the_sep = os.sep | |
| return the_sep | |
| class PathAliases(object): | |
| """A collection of aliases for paths. | |
| When combining data files from remote machines, often the paths to source | |
| code are different, for example, due to OS differences, or because of | |
| serialized checkouts on continuous integration machines. | |
| A `PathAliases` object tracks a list of pattern/result pairs, and can | |
| map a path through those aliases to produce a unified path. | |
| `locator` is a FileLocator that is used to canonicalize the results. | |
| """ | |
| def __init__(self, locator=None): | |
| self.aliases = [] | |
| self.locator = locator | |
| def add(self, pattern, result): | |
| """Add the `pattern`/`result` pair to the list of aliases. | |
| `pattern` is an `fnmatch`-style pattern. `result` is a simple | |
| string. When mapping paths, if a path starts with a match against | |
| `pattern`, then that match is replaced with `result`. This models | |
| isomorphic source trees being rooted at different places on two | |
| different machines. | |
| `pattern` can't end with a wildcard component, since that would | |
| match an entire tree, and not just its root. | |
| """ | |
| # The pattern can't end with a wildcard component. | |
| pattern = pattern.rstrip(r"\/") | |
| if pattern.endswith("*"): | |
| raise CoverageException("Pattern must not end with wildcards.") | |
| pattern_sep = sep(pattern) | |
| pattern += pattern_sep | |
| # Make a regex from the pattern. fnmatch always adds a \Z or $ to | |
| # match the whole string, which we don't want. | |
| regex_pat = fnmatch.translate(pattern).replace(r'\Z(', '(') | |
| if regex_pat.endswith("$"): | |
| regex_pat = regex_pat[:-1] | |
| # We want */a/b.py to match on Windows to, so change slash to match | |
| # either separator. | |
| regex_pat = regex_pat.replace(r"\/", r"[\\/]") | |
| # We want case-insensitive matching, so add that flag. | |
| regex = re.compile("(?i)" + regex_pat) | |
| # Normalize the result: it must end with a path separator. | |
| result_sep = sep(result) | |
| result = result.rstrip(r"\/") + result_sep | |
| self.aliases.append((regex, result, pattern_sep, result_sep)) | |
| def map(self, path): | |
| """Map `path` through the aliases. | |
| `path` is checked against all of the patterns. The first pattern to | |
| match is used to replace the root of the path with the result root. | |
| Only one pattern is ever used. If no patterns match, `path` is | |
| returned unchanged. | |
| The separator style in the result is made to match that of the result | |
| in the alias. | |
| """ | |
| for regex, result, pattern_sep, result_sep in self.aliases: | |
| m = regex.match(path) | |
| if m: | |
| new = path.replace(m.group(0), result) | |
| if pattern_sep != result_sep: | |
| new = new.replace(pattern_sep, result_sep) | |
| if self.locator: | |
| new = self.locator.canonical_filename(new) | |
| return new | |
| return path | |
| def find_python_files(dirname): | |
| """Yield all of the importable Python files in `dirname`, recursively.""" | |
| for dirpath, dirnames, filenames in os.walk(dirname, topdown=True): | |
| if '__init__.py' not in filenames: | |
| # If a directory doesn't have __init__.py, then it isn't | |
| # importable and neither are its files | |
| del dirnames[:] | |
| continue | |
| for filename in filenames: | |
| if fnmatch.fnmatch(filename, "*.py"): | |
| yield os.path.join(dirpath, filename) |